{
    "file_diffs": [
        {
            "old_file_content": "# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8  -*-\n# vi: set ft=python sts=4 ts=4 sw=4 et:\n### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##\n#\n#   See COPYING file distributed along with the datalad package for the\n#   copyright and license terms.\n#\n### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##g\n\"\"\"Variety of helpers to deal with AWS S3\n\nUse as a script to generate test buckets via e.g.\n\n    python -m datalad.support.s3 generate test1_dirs\n\"\"\"\n\n__docformat__ = 'restructuredtext'\n\nimport mimetypes\n\nfrom os.path import splitext\nimport re\n\nfrom datalad.support.network import urlquote, URL\n\nimport logging\nimport datalad.log  # Just to have lgr setup happen this one used a script\nlgr = logging.getLogger('datalad.s3')\n\nfrom datalad.dochelpers import exc_str\nfrom datalad.support.exceptions import (\n    DownloadError,\n    AccessDeniedError,\n    AccessPermissionExpiredError,\n    AnonymousAccessDeniedError,\n)\nfrom datalad.utils import try_multiple_dec\n\nfrom urllib.request import urlopen, Request\n\n\ntry:\n    import boto\n    from boto.s3.key import Key\n    from boto.exception import S3ResponseError\n    from boto.s3.connection import OrdinaryCallingFormat\nexcept Exception as e:\n    if not isinstance(e, ImportError):\n        lgr.warning(\"boto module failed to import although available: %s\" % exc_str(e))\n    boto = Key = S3ResponseError = OrdinaryCallingFormat = None\n\n\n# TODO: should become a config option and managed along with the rest\nS3_ADMIN_CREDENTIAL = \"datalad-datalad-admin-s3\"\nS3_TEST_CREDENTIAL = \"datalad-datalad-test-s3\"\n\n\ndef _get_bucket_connection(credential):\n    # eventually we should be able to have multiple credentials associated\n    # with different resources. Thus for now just making an option which\n    # one to use\n    # do full shebang with entering credentials\n    from datalad.downloaders.credentials import AWS_S3\n    credential = AWS_S3(credential, None)\n    if not credential.is_known:\n        credential.enter_new()\n    creds = credential()\n    return boto.connect_s3(creds[\"key_id\"], creds[\"secret_id\"])\n\n\ndef _handle_exception(e, bucket_name):\n    \"\"\"Helper to handle S3 connection exception\"\"\"\n    raise (\n        AccessDeniedError\n        if e.error_code == 'AccessDenied'\n        else DownloadError)(\n            \"Cannot connect to %s S3 bucket. Exception: %s\"\n            % (bucket_name, exc_str(e))\n        )\n\n\ndef _check_S3ResponseError(e):\n    \"\"\"Returns True if should be retried.\n\n    raises ... if token has expired\"\"\"\n    # https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html#ErrorCodeList\n    if e.status in (\n                    307,  # MovedTemporarily -- DNS updates etc\n                    503,  # Slow down -- too many requests, so perfect fit to sleep a bit\n                    ):\n        return True\n    if e.status == 400:\n        # Generic Bad Request -- could be many things! generally -- we retry, but\n        # some times provide more directed reaction\n        # ATM, as used, many requests we send with boto might be just HEAD requests\n        # (if I got it right) and we would not receive BODY back with the detailed\n        # error_code.  Then we will allow to retry until we get something we know how to\n        # handle it more specifically\n        if e.error_code == 'ExpiredToken':\n            raise AccessPermissionExpiredError(\"Used token to access S3 has expired: %s\" % exc_str(e))\n        elif not e.error_code:\n            lgr.log(5, \"Empty error_code in %s\", e)\n        return True\n    return False\n\n\ndef try_multiple_dec_s3(func):\n    \"\"\"An S3 specific adapter to @try_multiple_dec\n\n    To decorate func to try multiple times after some sleep upon encountering\n    some intermittent error from S3\n    \"\"\"\n    return try_multiple_dec(\n                ntrials=4,\n                duration=2.,\n                increment_type='exponential',\n                exceptions=S3ResponseError,\n                exceptions_filter=_check_S3ResponseError,\n                logger=lgr.debug,\n    )(func)\n\n\ndef get_bucket(conn, bucket_name):\n    \"\"\"A helper to get a bucket\n\n    Parameters\n    ----------\n    bucket_name: str\n        Name of the bucket to connect to\n    \"\"\"\n    try:\n        return try_multiple_dec_s3(conn.get_bucket)(bucket_name)\n    except S3ResponseError as e:\n        # can initially deny or error to connect to the specific bucket by name,\n        # and we would need to list which buckets are available under following\n        # credentials:\n        lgr.debug(\"Cannot access bucket %s by name with validation: %s\",\n                  bucket_name, exc_str(e))\n        if conn.anon:\n            raise AnonymousAccessDeniedError(\n                \"Access to the bucket %s did not succeed.  Requesting \"\n                \"'all buckets' for anonymous S3 connection makes \"\n                \"little sense and thus not supported.\" % bucket_name,\n                supported_types=['aws-s3']\n            )\n\n        if e.reason == \"Forbidden\":\n            # Could be just HEAD call boto issues is not allowed, and we should not\n            # try to verify that bucket is \"reachable\".  Just carry on\n            try:\n                return try_multiple_dec_s3(conn.get_bucket)(bucket_name, validate=False)\n            except S3ResponseError as e2:\n                lgr.debug(\"Cannot access bucket %s even without validation: %s\",\n                          bucket_name, exc_str(e2))\n                _handle_exception(e, bucket_name)\n\n        try:\n            all_buckets = try_multiple_dec_s3(conn.get_all_buckets)()\n            all_bucket_names = [b.name for b in all_buckets]\n            lgr.debug(\"Found following buckets %s\", ', '.join(all_bucket_names))\n            if bucket_name in all_bucket_names:\n                return all_buckets[all_bucket_names.index(bucket_name)]\n        except S3ResponseError as e2:\n            lgr.debug(\"Cannot access all buckets: %s\", exc_str(e2))\n            _handle_exception(e, 'any (originally requested %s)' % bucket_name)\n        else:\n            _handle_exception(e, bucket_name)\n\n\nclass VersionedFilesPool(object):\n    \"\"\"Just a helper which would help to create versioned files in the bucket\"\"\"\n    def __init__(self, bucket):\n        self._versions = {}\n        self._bucket = bucket\n\n    @property\n    def bucket(self):\n        return self._bucket\n\n    def __call__(self, filename, prefix='', load=None):\n        self._versions[filename] = version = self._versions.get(filename, 0) + 1\n        version_str = \"version%d\" % version\n        # if we are to upload fresh content\n        k = Key(self._bucket)\n        k.key = filename\n        #k.set_contents_from_filename('/home/yoh/.emacs')\n        base, ext = splitext(filename)\n        #content_type = None\n        mtype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'\n        headers = {'Content-Type': mtype}\n\n        if load is None:\n            load = prefix\n            if ext == 'html':\n                load += '<html><body>%s</body></html>' % version_str\n            else:\n                load += version_str\n\n        k.set_contents_from_string(load, headers=headers)\n        return k\n\n    def reset_version(self, filename):\n        self._versions[filename] = 0\n\n\ndef get_key_url(e, schema='http', versioned=True):\n    \"\"\"Generate an s3:// or http:// url given a key\n\n    if versioned url is requested but version_id is None, no versionId suffix\n    will be added\n    \"\"\"\n    # TODO: here we would need to encode the name since urlquote actually\n    # can't do that on its own... but then we should get a copy of the thing\n    # so we could still do the .format....\n    # ... = e.name.encode('utf-8')  # unicode isn't advised in URLs\n    e.name_urlquoted = urlquote(e.name)\n    if schema == 'http':\n        fmt = \"http://{e.bucket.name}.s3.amazonaws.com/{e.name_urlquoted}\"\n    elif schema == 's3':\n        fmt = \"s3://{e.bucket.name}/{e.name_urlquoted}\"\n    else:\n        raise ValueError(schema)\n    if versioned and e.version_id is not None:\n        fmt += \"?versionId={e.version_id}\"\n    return fmt.format(e=e)\n\n\ndef prune_and_delete_bucket(bucket):\n    \"\"\"Deletes all the content and then deletes bucket\n\n    Should be used with care -- no confirmation requested\n    \"\"\"\n    bucket.delete_keys(bucket.list_versions(''))\n    # this one doesn't work since it generates DeleteMarkers instead ;)\n    #for key in b.list_versions(''):\n    #    b.delete_key(key)\n    bucket.delete()\n    lgr.info(\"Bucket %s was removed\" % bucket.name)\n\n\ndef set_bucket_public_access_policy(bucket):\n    # we need to enable permissions for making content available\n    bucket.set_policy(\"\"\"{\n      \"Version\":\"2012-10-17\",\n      \"Statement\":[{\n          \"Sid\":\"AddPerm\",\n          \"Effect\":\"Allow\",\n          \"Principal\": \"*\",\n          \"Action\":[\"s3:GetObject\", \"s3:GetObjectVersion\", \"s3:GetObjectTorrent\", \"s3:GetObjectVersionTorrent\"],\n          \"Resource\":[\"arn:aws:s3:::%s/*\"]\n        }\n      ]\n    }\"\"\" % bucket.name)\n\n\ndef gen_test_bucket(bucket_name):\n    conn = _get_bucket_connection(S3_ADMIN_CREDENTIAL)\n    # assure we have none\n    try:\n        bucket = conn.get_bucket(bucket_name)\n        lgr.info(\"Deleting existing bucket %s\" % bucket.name)\n        prune_and_delete_bucket(bucket)\n    except:  # MIH: MemoryError?\n        # so nothing to worry about\n        pass\n    finally:\n        pass\n\n    return conn.create_bucket(bucket_name)\n\n\ndef _gen_bucket_test0(bucket_name=\"datalad-test0\", versioned=True):\n\n    bucket = gen_test_bucket(bucket_name)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    files(\"1version-nonversioned1.txt\")\n    files(\"2versions-nonversioned1.txt\")\n\n    if versioned:\n        # make bucket versioned AFTER we uploaded one file already\n        bucket.configure_versioning(True)\n\n    files(\"2versions-nonversioned1.txt\")\n    files(\"2versions-nonversioned1.txt_sameprefix\")\n    for v in range(3):\n        files(\"3versions-allversioned.txt\")\n    files(\"3versions-allversioned.txt_sameprefix\")  # to test possible problems\n\n    # File which was created and then removed\n    bucket.delete_key(files(\"1version-removed.txt\"))\n\n    # File which was created/removed/recreated (with new content)\n    bucket.delete_key(files(\"2versions-removed-recreated.txt\"))\n    files(\"2versions-removed-recreated.txt\")\n    files(\"2versions-removed-recreated.txt_sameprefix\")\n\n    # File which was created/removed/recreated (with new content)\n    f = \"1version-removed-recreated.txt\"\n    bucket.delete_key(files(f))\n    files.reset_version(f)\n    files(f)\n    lgr.info(\"Bucket %s was generated and populated\" % bucket_name)\n\n    return bucket\n\n\ndef gen_bucket_test0_versioned():\n    return _gen_bucket_test0('datalad-test0-versioned', versioned=True)\n\n\ndef gen_bucket_test0_nonversioned():\n    return _gen_bucket_test0('datalad-test0-nonversioned', versioned=False)\n\n\ndef gen_bucket_test1_dirs():\n    bucket_name = 'datalad-test1-dirs-versioned'\n    bucket = gen_test_bucket(bucket_name)\n    bucket.configure_versioning(True)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    files(\"d1\", load=\"\")  # creating an empty file\n    # then we would like to remove that d1 as a file and make a directory out of it\n    files(\"d1/file1.txt\")\n    # and then delete it and place it back\n    files(\"d1\", load=\"smth\")\n\n\ndef gen_bucket_test2_obscurenames_versioned():\n    # in principle bucket name could also contain ., but boto doesn't digest it\n    # well\n    bucket_name = 'datalad-test2-obscurenames-versioned'\n    bucket = gen_test_bucket(bucket_name)\n    bucket.configure_versioning(True)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    # http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html\n    files(\"f 1\", load=\"\")\n    files(\"f [1][2]\")\n    # Need to grow up for this .... TODO\n    #files(u\"юникод\")\n    #files(u\"юни/код\")\n    # all fancy ones at once\n    files(\"f!-_.*'( )\")\n    # the super-fancy which aren't guaranteed to be good idea (as well as [] above)\n    files(\"f &$=@:+,?;\")\n\n\ndef gen_bucket_test1_manydirs():\n    # to test crawling with flexible subdatasets making decisions\n    bucket_name = 'datalad-test1-manydirs-versioned'\n    bucket = gen_test_bucket(bucket_name)\n    bucket.configure_versioning(True)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    files(\"d1\", load=\"\")  # creating an empty file\n    # then we would like to remove that d1 as a file and make a directory out of it\n    files(\"d1/file1.txt\")\n    files(\"d1/sd1/file1.txt\")\n    files(\"d1/sd2/file3.txt\", load=\"a\")\n    files(\"d1/sd2/ssd1/file4.txt\")\n    files(\"d2/file1.txt\")\n    files(\"d2/sd1/file1.txt\")\n    files(\"d2/sd1/ssd/sssd/file1.txt\")\n\n\ndef add_version_to_url(url, version, replace=False):\n    \"\"\"Add a version ID to `url`.\n\n    Parameters\n    ----------\n    url : datalad.support.network.URL\n        A URL.\n    version : str\n        The value of 'versionId='.\n    replace : boolean, optional\n        If a versionID is already present in `url`, replace it.\n\n    Returns\n    -------\n    A versioned URL (str)\n    \"\"\"\n    version_id = \"versionId={}\".format(version)\n    if not url.query:\n        query = version_id\n    else:\n        ver_match = re.match(\"(?P<pre>.*&)?\"\n                             \"(?P<vers>versionId=[^&]+)\"\n                             \"(?P<post>&.*)?\",\n                             url.query)\n        if ver_match:\n            if replace:\n                query = \"\".join([ver_match.group(\"pre\") or \"\",\n                                 version_id,\n                                 ver_match.group(\"post\") or \"\"])\n            else:\n                query = url.query\n        else:\n            query = url.query + \"&\" + version_id\n    return URL(**dict(url.fields, query=query)).as_str()\n\n\ndef get_versioned_url(url, guarantee_versioned=False, return_all=False, verify=False,\n                      s3conn=None, update=False):\n    \"\"\"Given a url return a versioned URL\n\n    Originally targeting AWS S3 buckets with versioning enabled\n\n    Parameters\n    ----------\n    url : string\n    guarantee_versioned : bool, optional\n      Would fail if buckets is determined to have no versioning enabled.\n      It will not fail if we fail to determine if bucket is versioned or\n      not\n    return_all: bool, optional\n      If True, would return a list with URLs for all the versions of this\n      file, sorted chronologically with latest first (when possible, e.g.\n      for S3).  Remove markers get ignored\n    verify: bool, optional\n      Verify that URL is accessible. As discovered some versioned keys might\n      be denied access to\n    update : bool, optional\n      If the URL already contains a version ID, update it to the latest version\n      ID.  This option has no effect if return_all is true.\n\n    Returns\n    -------\n    string or list of string\n    \"\"\"\n    url_rec = URL(url)\n\n    s3_bucket, fpath = None, url_rec.path.lstrip('/')\n\n    was_versioned = False\n    all_versions = []\n\n    if url_rec.hostname.endswith('.s3.amazonaws.com'):\n        if url_rec.scheme not in ('http', 'https'):\n            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)\n        # we know how to slice this cat\n        s3_bucket = url_rec.hostname.split('.', 1)[0]\n    elif url_rec.hostname == 's3.amazonaws.com':\n        if url_rec.scheme not in ('http', 'https'):\n            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)\n        # url is s3.amazonaws.com/bucket/PATH\n        s3_bucket, fpath = fpath.split('/', 1)\n    elif url_rec.scheme == 's3':\n        s3_bucket = url_rec.hostname  # must be\n        if url_rec.query and 'versionId=' in url_rec.query:\n            was_versioned = True\n            all_versions.append(url)\n        else:\n            # and for now implement magical conversion to URL\n            # TODO: wouldn't work if needs special permissions etc\n            # actually for now\n            raise NotImplementedError\n\n    if s3_bucket:\n        # TODO: cache\n        if s3conn is None:\n            # we need to reuse our providers\n            from ..downloaders.providers import Providers\n            providers = Providers.from_config_files()\n            s3url = \"s3://%s/\" % s3_bucket\n            s3provider = providers.get_provider(s3url)\n            if s3provider.authenticator.bucket is not None and s3provider.authenticator.bucket.name == s3_bucket:\n                # we have established connection before, so let's just reuse\n                bucket = s3provider.authenticator.bucket\n            else:\n                bucket = s3provider.authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)\n        else:\n            bucket = s3conn.get_bucket(s3_bucket)\n\n        supports_versioning = True  # assume that it does\n        try:\n            supports_versioning = bucket.get_versioning_status()  # TODO cache\n        except S3ResponseError as e:\n            # might be forbidden, i.e. \"403 Forbidden\" so we try then anyways\n            supports_versioning = 'maybe'\n\n        if supports_versioning:\n            all_keys = bucket.list_versions(fpath)\n            # Filter and sort them so the newest one on top\n            all_keys = [x for x in sorted(all_keys, key=lambda x: (x.last_modified, x.is_latest))\n                        if ((x.name == fpath)  # match exact name, not just prefix\n                            )\n                        ][::-1]\n            # our current assumptions\n            assert(all_keys[0].is_latest)\n            # and now filter out delete markers etc\n            all_keys = [x for x in all_keys if isinstance(x, Key)]  # ignore DeleteMarkers\n            assert(all_keys)\n\n            for key in all_keys:\n                url_versioned = add_version_to_url(\n                    url_rec, key.version_id, replace=update and not return_all)\n\n                all_versions.append(url_versioned)\n                if verify:\n                    # it would throw HTTPError exception if not accessible\n                    _ = urlopen(Request(url_versioned))\n                was_versioned = True\n                if not return_all:\n                    break\n\n    if guarantee_versioned and not was_versioned:\n        raise RuntimeError(\"Could not version %s\" % url)\n\n    if not all_versions:\n        # we didn't get a chance\n        all_versions = [url_rec.as_str()]\n\n    if return_all:\n        return all_versions\n    else:\n        return all_versions[0]\n\n\nif __name__ == '__main__':\n    import sys\n    lgr.setLevel(logging.INFO)\n    # TODO: proper cmdline\n    if len(sys.argv) > 1 and sys.argv[1] == \"generate\":\n        if len(sys.argv) < 3:\n            raise ValueError(\"Say 'all' to regenerate all, or give a generators name\")\n        name = sys.argv[2]\n        if name.lower() == 'all':\n            for f in locals().keys():\n                if f.startswith('gen_bucket_'):\n                    locals()[f]()\n        else:\n            locals()['gen_bucket_%s' % name]()\n    else:\n        print(\"nothing todo\")\n",
            "new_file_content": "# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8  -*-\n# vi: set ft=python sts=4 ts=4 sw=4 et:\n### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##\n#\n#   See COPYING file distributed along with the datalad package for the\n#   copyright and license terms.\n#\n### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##g\n\"\"\"Variety of helpers to deal with AWS S3\n\nUse as a script to generate test buckets via e.g.\n\n    python -m datalad.support.s3 generate test1_dirs\n\"\"\"\n\n__docformat__ = 'restructuredtext'\n\nimport mimetypes\n\nfrom os.path import splitext\nimport re\n\nfrom datalad.support.network import urlquote, URL\n\nimport logging\nimport datalad.log  # Just to have lgr setup happen this one used a script\nlgr = logging.getLogger('datalad.s3')\n\nfrom datalad.dochelpers import exc_str\nfrom datalad.support.exceptions import (\n    DownloadError,\n    AccessDeniedError,\n    AccessPermissionExpiredError,\n    AnonymousAccessDeniedError,\n)\nfrom datalad.utils import try_multiple_dec\n\nfrom urllib.request import urlopen, Request\n\n\ntry:\n    import boto\n    from boto.s3.key import Key\n    from boto.exception import S3ResponseError\n    from boto.s3.connection import OrdinaryCallingFormat\nexcept Exception as e:\n    if not isinstance(e, ImportError):\n        lgr.warning(\"boto module failed to import although available: %s\" % exc_str(e))\n    boto = Key = S3ResponseError = OrdinaryCallingFormat = None\n\n\n# TODO: should become a config option and managed along with the rest\nS3_ADMIN_CREDENTIAL = \"datalad-datalad-admin-s3\"\nS3_TEST_CREDENTIAL = \"datalad-datalad-test-s3\"\n\n\ndef _get_bucket_connection(credential):\n    # eventually we should be able to have multiple credentials associated\n    # with different resources. Thus for now just making an option which\n    # one to use\n    # do full shebang with entering credentials\n    from datalad.downloaders.credentials import AWS_S3\n    credential = AWS_S3(credential, None)\n    if not credential.is_known:\n        credential.enter_new()\n    creds = credential()\n    return boto.connect_s3(creds[\"key_id\"], creds[\"secret_id\"])\n\n\ndef _handle_exception(e, bucket_name):\n    \"\"\"Helper to handle S3 connection exception\"\"\"\n    raise (\n        AccessDeniedError\n        if e.error_code == 'AccessDenied'\n        else DownloadError)(\n            \"Cannot connect to %s S3 bucket. Exception: %s\"\n            % (bucket_name, exc_str(e))\n        )\n\n\ndef _check_S3ResponseError(e):\n    \"\"\"Returns True if should be retried.\n\n    raises ... if token has expired\"\"\"\n    # https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html#ErrorCodeList\n    if e.status in (\n                    307,  # MovedTemporarily -- DNS updates etc\n                    503,  # Slow down -- too many requests, so perfect fit to sleep a bit\n                    ):\n        return True\n    if e.status == 400:\n        # Generic Bad Request -- could be many things! generally -- we retry, but\n        # some times provide more directed reaction\n        # ATM, as used, many requests we send with boto might be just HEAD requests\n        # (if I got it right) and we would not receive BODY back with the detailed\n        # error_code.  Then we will allow to retry until we get something we know how to\n        # handle it more specifically\n        if e.error_code == 'ExpiredToken':\n            raise AccessPermissionExpiredError(\"Used token to access S3 has expired: %s\" % exc_str(e))\n        elif not e.error_code:\n            lgr.log(5, \"Empty error_code in %s\", e)\n        return True\n    return False\n\n\ndef try_multiple_dec_s3(func):\n    \"\"\"An S3 specific adapter to @try_multiple_dec\n\n    To decorate func to try multiple times after some sleep upon encountering\n    some intermittent error from S3\n    \"\"\"\n    return try_multiple_dec(\n                ntrials=4,\n                duration=2.,\n                increment_type='exponential',\n                exceptions=S3ResponseError,\n                exceptions_filter=_check_S3ResponseError,\n                logger=lgr.debug,\n    )(func)\n\n\ndef get_bucket(conn, bucket_name):\n    \"\"\"A helper to get a bucket\n\n    Parameters\n    ----------\n    bucket_name: str\n        Name of the bucket to connect to\n    \"\"\"\n    try:\n        return try_multiple_dec_s3(conn.get_bucket)(bucket_name)\n    except S3ResponseError as e:\n        # can initially deny or error to connect to the specific bucket by name,\n        # and we would need to list which buckets are available under following\n        # credentials:\n        lgr.debug(\"Cannot access bucket %s by name with validation: %s\",\n                  bucket_name, exc_str(e))\n        if conn.anon:\n            raise AnonymousAccessDeniedError(\n                \"Access to the bucket %s did not succeed.  Requesting \"\n                \"'all buckets' for anonymous S3 connection makes \"\n                \"little sense and thus not supported.\" % bucket_name,\n                supported_types=['aws-s3']\n            )\n\n        if e.reason == \"Forbidden\":\n            # Could be just HEAD call boto issues is not allowed, and we should not\n            # try to verify that bucket is \"reachable\".  Just carry on\n            try:\n                return try_multiple_dec_s3(conn.get_bucket)(bucket_name, validate=False)\n            except S3ResponseError as e2:\n                lgr.debug(\"Cannot access bucket %s even without validation: %s\",\n                          bucket_name, exc_str(e2))\n                _handle_exception(e, bucket_name)\n\n        try:\n            all_buckets = try_multiple_dec_s3(conn.get_all_buckets)()\n            all_bucket_names = [b.name for b in all_buckets]\n            lgr.debug(\"Found following buckets %s\", ', '.join(all_bucket_names))\n            if bucket_name in all_bucket_names:\n                return all_buckets[all_bucket_names.index(bucket_name)]\n        except S3ResponseError as e2:\n            lgr.debug(\"Cannot access all buckets: %s\", exc_str(e2))\n            _handle_exception(e, 'any (originally requested %s)' % bucket_name)\n        else:\n            _handle_exception(e, bucket_name)\n\n\nclass VersionedFilesPool(object):\n    \"\"\"Just a helper which would help to create versioned files in the bucket\"\"\"\n    def __init__(self, bucket):\n        self._versions = {}\n        self._bucket = bucket\n\n    @property\n    def bucket(self):\n        return self._bucket\n\n    def __call__(self, filename, prefix='', load=None):\n        self._versions[filename] = version = self._versions.get(filename, 0) + 1\n        version_str = \"version%d\" % version\n        # if we are to upload fresh content\n        k = Key(self._bucket)\n        k.key = filename\n        #k.set_contents_from_filename('/home/yoh/.emacs')\n        base, ext = splitext(filename)\n        #content_type = None\n        mtype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'\n        headers = {'Content-Type': mtype}\n\n        if load is None:\n            load = prefix\n            if ext == 'html':\n                load += '<html><body>%s</body></html>' % version_str\n            else:\n                load += version_str\n\n        k.set_contents_from_string(load, headers=headers)\n        return k\n\n    def reset_version(self, filename):\n        self._versions[filename] = 0\n\n\ndef get_key_url(e, schema='http', versioned=True):\n    \"\"\"Generate an s3:// or http:// url given a key\n\n    if versioned url is requested but version_id is None, no versionId suffix\n    will be added\n    \"\"\"\n    # TODO: here we would need to encode the name since urlquote actually\n    # can't do that on its own... but then we should get a copy of the thing\n    # so we could still do the .format....\n    # ... = e.name.encode('utf-8')  # unicode isn't advised in URLs\n    e.name_urlquoted = urlquote(e.name)\n    if schema == 'http':\n        fmt = \"http://{e.bucket.name}.s3.amazonaws.com/{e.name_urlquoted}\"\n    elif schema == 's3':\n        fmt = \"s3://{e.bucket.name}/{e.name_urlquoted}\"\n    else:\n        raise ValueError(schema)\n    if versioned and e.version_id is not None:\n        fmt += \"?versionId={e.version_id}\"\n    return fmt.format(e=e)\n\n\ndef prune_and_delete_bucket(bucket):\n    \"\"\"Deletes all the content and then deletes bucket\n\n    Should be used with care -- no confirmation requested\n    \"\"\"\n    bucket.delete_keys(bucket.list_versions(''))\n    # this one doesn't work since it generates DeleteMarkers instead ;)\n    #for key in b.list_versions(''):\n    #    b.delete_key(key)\n    bucket.delete()\n    lgr.info(\"Bucket %s was removed\" % bucket.name)\n\n\ndef set_bucket_public_access_policy(bucket):\n    # we need to enable permissions for making content available\n    bucket.set_policy(\"\"\"{\n      \"Version\":\"2012-10-17\",\n      \"Statement\":[{\n          \"Sid\":\"AddPerm\",\n          \"Effect\":\"Allow\",\n          \"Principal\": \"*\",\n          \"Action\":[\"s3:GetObject\", \"s3:GetObjectVersion\", \"s3:GetObjectTorrent\", \"s3:GetObjectVersionTorrent\"],\n          \"Resource\":[\"arn:aws:s3:::%s/*\"]\n        }\n      ]\n    }\"\"\" % bucket.name)\n\n\ndef gen_test_bucket(bucket_name):\n    conn = _get_bucket_connection(S3_ADMIN_CREDENTIAL)\n    # assure we have none\n    try:\n        bucket = conn.get_bucket(bucket_name)\n        lgr.info(\"Deleting existing bucket %s\" % bucket.name)\n        prune_and_delete_bucket(bucket)\n    except:  # MIH: MemoryError?\n        # so nothing to worry about\n        pass\n    finally:\n        pass\n\n    return conn.create_bucket(bucket_name)\n\n\ndef _gen_bucket_test0(bucket_name=\"datalad-test0\", versioned=True):\n\n    bucket = gen_test_bucket(bucket_name)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    files(\"1version-nonversioned1.txt\")\n    files(\"2versions-nonversioned1.txt\")\n\n    if versioned:\n        # make bucket versioned AFTER we uploaded one file already\n        bucket.configure_versioning(True)\n\n    files(\"2versions-nonversioned1.txt\")\n    files(\"2versions-nonversioned1.txt_sameprefix\")\n    for v in range(3):\n        files(\"3versions-allversioned.txt\")\n    files(\"3versions-allversioned.txt_sameprefix\")  # to test possible problems\n\n    # File which was created and then removed\n    bucket.delete_key(files(\"1version-removed.txt\"))\n\n    # File which was created/removed/recreated (with new content)\n    bucket.delete_key(files(\"2versions-removed-recreated.txt\"))\n    files(\"2versions-removed-recreated.txt\")\n    files(\"2versions-removed-recreated.txt_sameprefix\")\n\n    # File which was created/removed/recreated (with new content)\n    f = \"1version-removed-recreated.txt\"\n    bucket.delete_key(files(f))\n    files.reset_version(f)\n    files(f)\n    lgr.info(\"Bucket %s was generated and populated\" % bucket_name)\n\n    return bucket\n\n\ndef gen_bucket_test0_versioned():\n    return _gen_bucket_test0('datalad-test0-versioned', versioned=True)\n\n\ndef gen_bucket_test0_nonversioned():\n    return _gen_bucket_test0('datalad-test0-nonversioned', versioned=False)\n\n\ndef gen_bucket_test1_dirs():\n    bucket_name = 'datalad-test1-dirs-versioned'\n    bucket = gen_test_bucket(bucket_name)\n    bucket.configure_versioning(True)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    files(\"d1\", load=\"\")  # creating an empty file\n    # then we would like to remove that d1 as a file and make a directory out of it\n    files(\"d1/file1.txt\")\n    # and then delete it and place it back\n    files(\"d1\", load=\"smth\")\n\n\ndef gen_bucket_test2_obscurenames_versioned():\n    # in principle bucket name could also contain ., but boto doesn't digest it\n    # well\n    bucket_name = 'datalad-test2-obscurenames-versioned'\n    bucket = gen_test_bucket(bucket_name)\n    bucket.configure_versioning(True)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    # http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html\n    files(\"f 1\", load=\"\")\n    files(\"f [1][2]\")\n    # Need to grow up for this .... TODO\n    #files(u\"юникод\")\n    #files(u\"юни/код\")\n    # all fancy ones at once\n    files(\"f!-_.*'( )\")\n    # the super-fancy which aren't guaranteed to be good idea (as well as [] above)\n    files(\"f &$=@:+,?;\")\n\n\ndef gen_bucket_test1_manydirs():\n    # to test crawling with flexible subdatasets making decisions\n    bucket_name = 'datalad-test1-manydirs-versioned'\n    bucket = gen_test_bucket(bucket_name)\n    bucket.configure_versioning(True)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    files(\"d1\", load=\"\")  # creating an empty file\n    # then we would like to remove that d1 as a file and make a directory out of it\n    files(\"d1/file1.txt\")\n    files(\"d1/sd1/file1.txt\")\n    files(\"d1/sd2/file3.txt\", load=\"a\")\n    files(\"d1/sd2/ssd1/file4.txt\")\n    files(\"d2/file1.txt\")\n    files(\"d2/sd1/file1.txt\")\n    files(\"d2/sd1/ssd/sssd/file1.txt\")\n\n\ndef add_version_to_url(url, version, replace=False):\n    \"\"\"Add a version ID to `url`.\n\n    Parameters\n    ----------\n    url : datalad.support.network.URL\n        A URL.\n    version : str\n        The value of 'versionId='.\n    replace : boolean, optional\n        If a versionID is already present in `url`, replace it.\n\n    Returns\n    -------\n    A versioned URL (str)\n    \"\"\"\n    version_id = \"versionId={}\".format(version)\n    if not url.query:\n        query = version_id\n    else:\n        ver_match = re.match(\"(?P<pre>.*&)?\"\n                             \"(?P<vers>versionId=[^&]+)\"\n                             \"(?P<post>&.*)?\",\n                             url.query)\n        if ver_match:\n            if replace:\n                query = \"\".join([ver_match.group(\"pre\") or \"\",\n                                 version_id,\n                                 ver_match.group(\"post\") or \"\"])\n            else:\n                query = url.query\n        else:\n            query = url.query + \"&\" + version_id\n    return URL(**dict(url.fields, query=query)).as_str()\n\n\ndef get_versioned_url(url, guarantee_versioned=False, return_all=False, verify=False,\n                      s3conn=None, update=False):\n    \"\"\"Given a url return a versioned URL\n\n    Originally targeting AWS S3 buckets with versioning enabled\n\n    Parameters\n    ----------\n    url : string\n    guarantee_versioned : bool, optional\n      Would fail if buckets is determined to have no versioning enabled.\n      It will not fail if we fail to determine if bucket is versioned or\n      not\n    return_all: bool, optional\n      If True, would return a list with URLs for all the versions of this\n      file, sorted chronologically with latest first (when possible, e.g.\n      for S3).  Remove markers get ignored\n    verify: bool, optional\n      Verify that URL is accessible. As discovered some versioned keys might\n      be denied access to\n    update : bool, optional\n      If the URL already contains a version ID, update it to the latest version\n      ID.  This option has no effect if return_all is true.\n\n    Returns\n    -------\n    string or list of string\n    \"\"\"\n    url_rec = URL(url)\n\n    s3_bucket, fpath = None, url_rec.path.lstrip('/')\n\n    was_versioned = False\n    all_versions = []\n\n    if url_rec.hostname.endswith('.s3.amazonaws.com'):\n        if url_rec.scheme not in ('http', 'https'):\n            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)\n        # bucket name could have . in it, e.g. openneuro.org\n        s3_bucket = url_rec.hostname[:-len('.s3.amazonaws.com')]\n    elif url_rec.hostname == 's3.amazonaws.com':\n        if url_rec.scheme not in ('http', 'https'):\n            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)\n        # url is s3.amazonaws.com/bucket/PATH\n        s3_bucket, fpath = fpath.split('/', 1)\n    elif url_rec.scheme == 's3':\n        s3_bucket = url_rec.hostname  # must be\n        if url_rec.query and 'versionId=' in url_rec.query:\n            was_versioned = True\n            all_versions.append(url)\n        else:\n            # and for now implement magical conversion to URL\n            # TODO: wouldn't work if needs special permissions etc\n            # actually for now\n            raise NotImplementedError\n\n    if s3_bucket:\n        # TODO: cache\n        if s3conn is None:\n            # we need to reuse our providers\n            from ..downloaders.providers import Providers\n            providers = Providers.from_config_files()\n            s3url = \"s3://%s/\" % s3_bucket\n            s3provider = providers.get_provider(s3url)\n            authenticator = s3provider.authenticator\n            if not authenticator:\n                # We will use anonymous one\n                from ..downloaders.s3 import S3Authenticator\n                authenticator = S3Authenticator()\n            if authenticator.bucket is not None and authenticator.bucket.name == s3_bucket:\n                # we have established connection before, so let's just reuse\n                bucket = authenticator.bucket\n            else:\n                bucket = authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)\n        else:\n            bucket = s3conn.get_bucket(s3_bucket)\n\n        supports_versioning = True  # assume that it does\n        try:\n            supports_versioning = bucket.get_versioning_status()  # TODO cache\n        except S3ResponseError as e:\n            # might be forbidden, i.e. \"403 Forbidden\" so we try then anyways\n            supports_versioning = 'maybe'\n\n        if supports_versioning:\n            all_keys = bucket.list_versions(fpath)\n            # Filter and sort them so the newest one on top\n            all_keys = [x for x in sorted(all_keys, key=lambda x: (x.last_modified, x.is_latest))\n                        if ((x.name == fpath)  # match exact name, not just prefix\n                            )\n                        ][::-1]\n            # our current assumptions\n            assert(all_keys[0].is_latest)\n            # and now filter out delete markers etc\n            all_keys = [x for x in all_keys if isinstance(x, Key)]  # ignore DeleteMarkers\n            assert(all_keys)\n\n            for key in all_keys:\n                url_versioned = add_version_to_url(\n                    url_rec, key.version_id, replace=update and not return_all)\n\n                all_versions.append(url_versioned)\n                if verify:\n                    # it would throw HTTPError exception if not accessible\n                    _ = urlopen(Request(url_versioned))\n                was_versioned = True\n                if not return_all:\n                    break\n\n    if guarantee_versioned and not was_versioned:\n        raise RuntimeError(\"Could not version %s\" % url)\n\n    if not all_versions:\n        # we didn't get a chance\n        all_versions = [url_rec.as_str()]\n\n    if return_all:\n        return all_versions\n    else:\n        return all_versions[0]\n\n\nif __name__ == '__main__':\n    import sys\n    lgr.setLevel(logging.INFO)\n    # TODO: proper cmdline\n    if len(sys.argv) > 1 and sys.argv[1] == \"generate\":\n        if len(sys.argv) < 3:\n            raise ValueError(\"Say 'all' to regenerate all, or give a generators name\")\n        name = sys.argv[2]\n        if name.lower() == 'all':\n            for f in locals().keys():\n                if f.startswith('gen_bucket_'):\n                    locals()[f]()\n        else:\n            locals()['gen_bucket_%s' % name]()\n    else:\n        print(\"nothing todo\")\n",
            "header": {
                "file": {
                    "path": "datalad/support/s3.py"
                },
                "misc_line": null
            },
            "index_line": {
                "old_commit_hash": "6336a6d44",
                "new_commit_hash": "cbecf4e14",
                "mode": "100644"
            },
            "is_binary_file": false,
            "binary_line": null,
            "minus_file": {
                "path": "a/datalad/support/s3.py"
            },
            "plus_file": {
                "path": "b/datalad/support/s3.py"
            },
            "hunks": [
                {
                    "descriptor": {
                        "old_range": {
                            "start": 457,
                            "length": 8
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                        "new_range": {
                            "start": 457,
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                        "section": "def get_versioned_url(url, guarantee_versioned=False, return_all=False, verify=F"
                    },
                    "line_group": {
                        "all_lines": [
                            {
                                "content": "    if url_rec.hostname.endswith('.s3.amazonaws.com'):",
                                "type": "context"
                            },
                            {
                                "content": "        if url_rec.scheme not in ('http', 'https'):",
                                "type": "context"
                            },
                            {
                                "content": "            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)",
                                "type": "context"
                            },
                            {
                                "content": "        # we know how to slice this cat",
                                "type": "deleted"
                            },
                            {
                                "content": "        s3_bucket = url_rec.hostname.split('.', 1)[0]",
                                "type": "deleted"
                            },
                            {
                                "content": "        # bucket name could have . in it, e.g. openneuro.org",
                                "type": "added"
                            },
                            {
                                "content": "        s3_bucket = url_rec.hostname[:-len('.s3.amazonaws.com')]",
                                "type": "added"
                            },
                            {
                                "content": "    elif url_rec.hostname == 's3.amazonaws.com':",
                                "type": "context"
                            },
                            {
                                "content": "        if url_rec.scheme not in ('http', 'https'):",
                                "type": "context"
                            },
                            {
                                "content": "            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)",
                                "type": "context"
                            }
                        ]
                    },
                    "modified_entities": [
                        {
                            "file_name": "datalad/support/s3.py",
                            "type": "function",
                            "name": "get_versioned_url",
                            "content": "def get_versioned_url(url, guarantee_versioned=False, return_all=False, verify=False,\n                      s3conn=None, update=False):\n    \"\"\"Given a url return a versioned URL\n\n    Originally targeting AWS S3 buckets with versioning enabled\n\n    Parameters\n    ----------\n    url : string\n    guarantee_versioned : bool, optional\n      Would fail if buckets is determined to have no versioning enabled.\n      It will not fail if we fail to determine if bucket is versioned or\n      not\n    return_all: bool, optional\n      If True, would return a list with URLs for all the versions of this\n      file, sorted chronologically with latest first (when possible, e.g.\n      for S3).  Remove markers get ignored\n    verify: bool, optional\n      Verify that URL is accessible. As discovered some versioned keys might\n      be denied access to\n    update : bool, optional\n      If the URL already contains a version ID, update it to the latest version\n      ID.  This option has no effect if return_all is true.\n\n    Returns\n    -------\n    string or list of string\n    \"\"\"\n    url_rec = URL(url)\n\n    s3_bucket, fpath = None, url_rec.path.lstrip('/')\n\n    was_versioned = False\n    all_versions = []\n\n    if url_rec.hostname.endswith('.s3.amazonaws.com'):\n        if url_rec.scheme not in ('http', 'https'):\n            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)\n        # we know how to slice this cat\n        s3_bucket = url_rec.hostname.split('.', 1)[0]\n    elif url_rec.hostname == 's3.amazonaws.com':\n        if url_rec.scheme not in ('http', 'https'):\n            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)\n        # url is s3.amazonaws.com/bucket/PATH\n        s3_bucket, fpath = fpath.split('/', 1)\n    elif url_rec.scheme == 's3':\n        s3_bucket = url_rec.hostname  # must be\n        if url_rec.query and 'versionId=' in url_rec.query:\n            was_versioned = True\n            all_versions.append(url)\n        else:\n            # and for now implement magical conversion to URL\n            # TODO: wouldn't work if needs special permissions etc\n            # actually for now\n            raise NotImplementedError\n\n    if s3_bucket:\n        # TODO: cache\n        if s3conn is None:\n            # we need to reuse our providers\n            from ..downloaders.providers import Providers\n            providers = Providers.from_config_files()\n            s3url = \"s3://%s/\" % s3_bucket\n            s3provider = providers.get_provider(s3url)\n            if s3provider.authenticator.bucket is not None and s3provider.authenticator.bucket.name == s3_bucket:\n                # we have established connection before, so let's just reuse\n                bucket = s3provider.authenticator.bucket\n            else:\n                bucket = s3provider.authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)\n        else:\n            bucket = s3conn.get_bucket(s3_bucket)\n\n        supports_versioning = True  # assume that it does\n        try:\n            supports_versioning = bucket.get_versioning_status()  # TODO cache\n        except S3ResponseError as e:\n            # might be forbidden, i.e. \"403 Forbidden\" so we try then anyways\n            supports_versioning = 'maybe'\n\n        if supports_versioning:\n            all_keys = bucket.list_versions(fpath)\n            # Filter and sort them so the newest one on top\n            all_keys = [x for x in sorted(all_keys, key=lambda x: (x.last_modified, x.is_latest))\n                        if ((x.name == fpath)  # match exact name, not just prefix\n                            )\n                        ][::-1]\n            # our current assumptions\n            assert(all_keys[0].is_latest)\n            # and now filter out delete markers etc\n            all_keys = [x for x in all_keys if isinstance(x, Key)]  # ignore DeleteMarkers\n            assert(all_keys)\n\n            for key in all_keys:\n                url_versioned = add_version_to_url(\n                    url_rec, key.version_id, replace=update and not return_all)\n\n                all_versions.append(url_versioned)\n                if verify:\n                    # it would throw HTTPError exception if not accessible\n                    _ = urlopen(Request(url_versioned))\n                was_versioned = True\n                if not return_all:\n                    break\n\n    if guarantee_versioned and not was_versioned:\n        raise RuntimeError(\"Could not version %s\" % url)\n\n    if not all_versions:\n        # we didn't get a chance\n        all_versions = [url_rec.as_str()]\n\n    if return_all:\n        return all_versions\n    else:\n        return all_versions[0]",
                            "ast_type_str": "FunctionDef",
                            "start_lineno": 422,
                            "end_lineno": 536,
                            "parent": null
                        }
                    ],
                    "added_entities": [],
                    "deleted_entities": []
                },
                {
                    "descriptor": {
                        "old_range": {
                            "start": 483,
                            "length": 11
                        },
                        "new_range": {
                            "start": 483,
                            "length": 16
                        },
                        "section": "def get_versioned_url(url, guarantee_versioned=False, return_all=False, verify=F"
                    },
                    "line_group": {
                        "all_lines": [
                            {
                                "content": "            providers = Providers.from_config_files()",
                                "type": "context"
                            },
                            {
                                "content": "            s3url = \"s3://%s/\" % s3_bucket",
                                "type": "context"
                            },
                            {
                                "content": "            s3provider = providers.get_provider(s3url)",
                                "type": "context"
                            },
                            {
                                "content": "            if s3provider.authenticator.bucket is not None and s3provider.authenticator.bucket.name == s3_bucket:",
                                "type": "deleted"
                            },
                            {
                                "content": "            authenticator = s3provider.authenticator",
                                "type": "added"
                            },
                            {
                                "content": "            if not authenticator:",
                                "type": "added"
                            },
                            {
                                "content": "                # We will use anonymous one",
                                "type": "added"
                            },
                            {
                                "content": "                from ..downloaders.s3 import S3Authenticator",
                                "type": "added"
                            },
                            {
                                "content": "                authenticator = S3Authenticator()",
                                "type": "added"
                            },
                            {
                                "content": "            if authenticator.bucket is not None and authenticator.bucket.name == s3_bucket:",
                                "type": "added"
                            },
                            {
                                "content": "                # we have established connection before, so let's just reuse",
                                "type": "context"
                            },
                            {
                                "content": "                bucket = s3provider.authenticator.bucket",
                                "type": "deleted"
                            },
                            {
                                "content": "                bucket = authenticator.bucket",
                                "type": "added"
                            },
                            {
                                "content": "            else:",
                                "type": "context"
                            },
                            {
                                "content": "                bucket = s3provider.authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)",
                                "type": "deleted"
                            },
                            {
                                "content": "                bucket = authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)",
                                "type": "added"
                            },
                            {
                                "content": "        else:",
                                "type": "context"
                            },
                            {
                                "content": "            bucket = s3conn.get_bucket(s3_bucket)",
                                "type": "context"
                            },
                            {
                                "content": "",
                                "type": "context"
                            }
                        ]
                    },
                    "modified_entities": [
                        {
                            "file_name": "datalad/support/s3.py",
                            "type": "function",
                            "name": "get_versioned_url",
                            "content": "def get_versioned_url(url, guarantee_versioned=False, return_all=False, verify=False,\n                      s3conn=None, update=False):\n    \"\"\"Given a url return a versioned URL\n\n    Originally targeting AWS S3 buckets with versioning enabled\n\n    Parameters\n    ----------\n    url : string\n    guarantee_versioned : bool, optional\n      Would fail if buckets is determined to have no versioning enabled.\n      It will not fail if we fail to determine if bucket is versioned or\n      not\n    return_all: bool, optional\n      If True, would return a list with URLs for all the versions of this\n      file, sorted chronologically with latest first (when possible, e.g.\n      for S3).  Remove markers get ignored\n    verify: bool, optional\n      Verify that URL is accessible. As discovered some versioned keys might\n      be denied access to\n    update : bool, optional\n      If the URL already contains a version ID, update it to the latest version\n      ID.  This option has no effect if return_all is true.\n\n    Returns\n    -------\n    string or list of string\n    \"\"\"\n    url_rec = URL(url)\n\n    s3_bucket, fpath = None, url_rec.path.lstrip('/')\n\n    was_versioned = False\n    all_versions = []\n\n    if url_rec.hostname.endswith('.s3.amazonaws.com'):\n        if url_rec.scheme not in ('http', 'https'):\n            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)\n        # we know how to slice this cat\n        s3_bucket = url_rec.hostname.split('.', 1)[0]\n    elif url_rec.hostname == 's3.amazonaws.com':\n        if url_rec.scheme not in ('http', 'https'):\n            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)\n        # url is s3.amazonaws.com/bucket/PATH\n        s3_bucket, fpath = fpath.split('/', 1)\n    elif url_rec.scheme == 's3':\n        s3_bucket = url_rec.hostname  # must be\n        if url_rec.query and 'versionId=' in url_rec.query:\n            was_versioned = True\n            all_versions.append(url)\n        else:\n            # and for now implement magical conversion to URL\n            # TODO: wouldn't work if needs special permissions etc\n            # actually for now\n            raise NotImplementedError\n\n    if s3_bucket:\n        # TODO: cache\n        if s3conn is None:\n            # we need to reuse our providers\n            from ..downloaders.providers import Providers\n            providers = Providers.from_config_files()\n            s3url = \"s3://%s/\" % s3_bucket\n            s3provider = providers.get_provider(s3url)\n            if s3provider.authenticator.bucket is not None and s3provider.authenticator.bucket.name == s3_bucket:\n                # we have established connection before, so let's just reuse\n                bucket = s3provider.authenticator.bucket\n            else:\n                bucket = s3provider.authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)\n        else:\n            bucket = s3conn.get_bucket(s3_bucket)\n\n        supports_versioning = True  # assume that it does\n        try:\n            supports_versioning = bucket.get_versioning_status()  # TODO cache\n        except S3ResponseError as e:\n            # might be forbidden, i.e. \"403 Forbidden\" so we try then anyways\n            supports_versioning = 'maybe'\n\n        if supports_versioning:\n            all_keys = bucket.list_versions(fpath)\n            # Filter and sort them so the newest one on top\n            all_keys = [x for x in sorted(all_keys, key=lambda x: (x.last_modified, x.is_latest))\n                        if ((x.name == fpath)  # match exact name, not just prefix\n                            )\n                        ][::-1]\n            # our current assumptions\n            assert(all_keys[0].is_latest)\n            # and now filter out delete markers etc\n            all_keys = [x for x in all_keys if isinstance(x, Key)]  # ignore DeleteMarkers\n            assert(all_keys)\n\n            for key in all_keys:\n                url_versioned = add_version_to_url(\n                    url_rec, key.version_id, replace=update and not return_all)\n\n                all_versions.append(url_versioned)\n                if verify:\n                    # it would throw HTTPError exception if not accessible\n                    _ = urlopen(Request(url_versioned))\n                was_versioned = True\n                if not return_all:\n                    break\n\n    if guarantee_versioned and not was_versioned:\n        raise RuntimeError(\"Could not version %s\" % url)\n\n    if not all_versions:\n        # we didn't get a chance\n        all_versions = [url_rec.as_str()]\n\n    if return_all:\n        return all_versions\n    else:\n        return all_versions[0]",
                            "ast_type_str": "FunctionDef",
                            "start_lineno": 422,
                            "end_lineno": 536,
                            "parent": null
                        }
                    ],
                    "added_entities": [],
                    "deleted_entities": []
                }
            ]
        },
        {
            "old_file_content": "# emacs: -*- mode: python; py-indent-offset: 4; tab-width: 4; indent-tabs-mode: nil -*-\n# ex: set sts=4 ts=4 sw=4 noet:\n# ## ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##\n#\n#   See COPYING file distributed along with the datalad package for the\n#   copyright and license terms.\n#\n# ## ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##\n\"\"\"Test S3 supporting functionality\n\n\"\"\"\n\nfrom datalad.support.network import URL\nfrom datalad.support.s3 import add_version_to_url, get_versioned_url\nfrom datalad.tests.utils import (\n    assert_raises,\n    eq_,\n    ok_startswith,\n    skip_if_no_network,\n    use_cassette,\n)\nfrom datalad.downloaders.tests.utils import get_test_providers\n\n\ndef test_add_version_to_url():\n    base_url = \"http://ex.com/f.txt\"\n    base_url_query = \"http://ex.com/f.txt?k=v\"\n    for replace in True, False:\n        eq_(add_version_to_url(URL(base_url), \"new.id\", replace=replace),\n            base_url + \"?versionId=new.id\")\n\n        eq_(add_version_to_url(URL(base_url_query),\n                               \"new.id\", replace=replace),\n            base_url_query + \"&versionId=new.id\")\n\n        expected = \"new.id\" if replace else \"orig.id\"\n        eq_(add_version_to_url(URL(base_url + \"?versionId=orig.id\"),\n                               \"new.id\",\n                               replace=replace),\n            base_url + \"?versionId=\" + expected)\n\n        eq_(add_version_to_url(URL(base_url_query + \"&versionId=orig.id\"),\n                               \"new.id\",\n                               replace=replace),\n            base_url_query + \"&versionId=\" + expected)\n\n\n@skip_if_no_network\n@use_cassette('s3_test_version_url')\ndef test_get_versioned_url():\n    get_test_providers('s3://openfmri/tarballs')  # to verify having credentials to access openfmri via S3\n    for url_pref in ('http://openfmri.s3.amazonaws.com', 'https://s3.amazonaws.com/openfmri'):\n        eq_(get_versioned_url(url_pref + \"/tarballs/ds001_raw.tgz\"),\n            url_pref + \"/tarballs/ds001_raw.tgz?versionId=null\")\n\n        eq_(get_versioned_url(url_pref + \"/tarballs/ds001_raw.tgz?param=1\"),\n            url_pref + \"/tarballs/ds001_raw.tgz?param=1&versionId=null\")\n\n        # We don't duplicate the version if it already exists.\n        eq_(get_versioned_url(url_pref + \"/tarballs/ds001_raw.tgz?versionId=null\"),\n            url_pref + \"/tarballs/ds001_raw.tgz?versionId=null\")\n\n    # something is wrong there\n    #print(get_versioned_url(\"http://openfmri.s3.amazonaws.com/ds001/demographics.txt\"))\n\n    eq_(get_versioned_url(\"someurl\"), \"someurl\")  # should just return original one\n    assert_raises(RuntimeError, get_versioned_url, \"someurl\", guarantee_versioned=True)\n\n    # TODO: on a bucket without versioning\n    url = \"http://datalad-test0-nonversioned.s3.amazonaws.com/2versions-removed-recreated.txt\"\n    eq_(get_versioned_url(url), url)\n    eq_(get_versioned_url(url, return_all=True), [url])\n\n    assert_raises(NotImplementedError, get_versioned_url, \"s3://buga\")\n\n    urls = get_versioned_url(\"http://datalad-test0-versioned.s3.amazonaws.com/2versions-removed-recreated.txt\",\n                             return_all=True, verify=True)\n    eq_(len(set(urls)), len(urls))  # all unique\n    for url in urls:\n        # so we didn't grab other files along with the same prefix\n        ok_startswith(url, 'http://datalad-test0-versioned.s3.amazonaws.com/2versions-removed-recreated.txt?versionId=')\n\n    # Update a versioned URL with a newer version tag.\n    url_3ver = \"http://datalad-test0-versioned.s3.amazonaws.com/3versions-allversioned.txt\"\n    url_3ver_input = url_3ver + \"?versionId=b.qCuh7Sg58VIYj8TVHzbRS97EvejzEl\"\n    eq_(get_versioned_url(url_3ver_input), url_3ver_input)\n    eq_(get_versioned_url(url_3ver_input, update=True),\n        url_3ver + \"?versionId=Kvuind11HZh._dCPaDAb0OY9dRrQoTMn\")\n\n\n@skip_if_no_network\n@use_cassette('s3_test_version_url_deleted')\ndef test_version_url_deleted():\n    get_test_providers('s3://datalad-test0-versioned/', reload=True)  # to verify having credentials to access\n    # openfmri via S3\n    # it existed and then was removed\n    fpath = \"1version-removed.txt\"\n    url = \"http://datalad-test0-versioned.s3.amazonaws.com/%s\" % fpath\n    turl = \"http://datalad-test0-versioned.s3.amazonaws.com/%s\" \\\n           \"?versionId=eZ5Hgwo8azfBv3QT7aW9dmm2sbLUY.QP\" % fpath\n    eq_(get_versioned_url(url), turl)\n    # too heavy for verification!\n    #eq_(get_versioned_url(url, verify=True), turl)\n",
            "new_file_content": "# emacs: -*- mode: python; py-indent-offset: 4; tab-width: 4; indent-tabs-mode: nil -*-\n# ex: set sts=4 ts=4 sw=4 noet:\n# ## ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##\n#\n#   See COPYING file distributed along with the datalad package for the\n#   copyright and license terms.\n#\n# ## ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##\n\"\"\"Test S3 supporting functionality\n\n\"\"\"\n\nfrom datalad.support.network import URL\nfrom datalad.support.s3 import add_version_to_url, get_versioned_url\nfrom datalad.tests.utils import (\n    assert_raises,\n    eq_,\n    ok_startswith,\n    skip_if_no_network,\n    use_cassette,\n)\nfrom datalad.downloaders.tests.utils import get_test_providers\n\n\ndef test_add_version_to_url():\n    base_url = \"http://ex.com/f.txt\"\n    base_url_query = \"http://ex.com/f.txt?k=v\"\n    for replace in True, False:\n        eq_(add_version_to_url(URL(base_url), \"new.id\", replace=replace),\n            base_url + \"?versionId=new.id\")\n\n        eq_(add_version_to_url(URL(base_url_query),\n                               \"new.id\", replace=replace),\n            base_url_query + \"&versionId=new.id\")\n\n        expected = \"new.id\" if replace else \"orig.id\"\n        eq_(add_version_to_url(URL(base_url + \"?versionId=orig.id\"),\n                               \"new.id\",\n                               replace=replace),\n            base_url + \"?versionId=\" + expected)\n\n        eq_(add_version_to_url(URL(base_url_query + \"&versionId=orig.id\"),\n                               \"new.id\",\n                               replace=replace),\n            base_url_query + \"&versionId=\" + expected)\n\n\n@skip_if_no_network\n@use_cassette('s3_test_version_url')\ndef test_get_versioned_url():\n    get_test_providers('s3://openfmri/tarballs')  # to verify having credentials to access openfmri via S3\n    for url_pref in ('http://openfmri.s3.amazonaws.com', 'https://s3.amazonaws.com/openfmri'):\n        eq_(get_versioned_url(url_pref + \"/tarballs/ds001_raw.tgz\"),\n            url_pref + \"/tarballs/ds001_raw.tgz?versionId=null\")\n\n        eq_(get_versioned_url(url_pref + \"/tarballs/ds001_raw.tgz?param=1\"),\n            url_pref + \"/tarballs/ds001_raw.tgz?param=1&versionId=null\")\n\n        # We don't duplicate the version if it already exists.\n        eq_(get_versioned_url(url_pref + \"/tarballs/ds001_raw.tgz?versionId=null\"),\n            url_pref + \"/tarballs/ds001_raw.tgz?versionId=null\")\n\n    # something is wrong there\n    #print(get_versioned_url(\"http://openfmri.s3.amazonaws.com/ds001/demographics.txt\"))\n\n    eq_(get_versioned_url(\"someurl\"), \"someurl\")  # should just return original one\n    assert_raises(RuntimeError, get_versioned_url, \"someurl\", guarantee_versioned=True)\n\n    # TODO: on a bucket without versioning\n    url = \"http://datalad-test0-nonversioned.s3.amazonaws.com/2versions-removed-recreated.txt\"\n    eq_(get_versioned_url(url), url)\n    eq_(get_versioned_url(url, return_all=True), [url])\n\n    assert_raises(NotImplementedError, get_versioned_url, \"s3://buga\")\n\n    urls = get_versioned_url(\"http://datalad-test0-versioned.s3.amazonaws.com/2versions-removed-recreated.txt\",\n                             return_all=True, verify=True)\n    eq_(len(set(urls)), len(urls))  # all unique\n    for url in urls:\n        # so we didn't grab other files along with the same prefix\n        ok_startswith(url, 'http://datalad-test0-versioned.s3.amazonaws.com/2versions-removed-recreated.txt?versionId=')\n\n    # Update a versioned URL with a newer version tag.\n    url_3ver = \"http://datalad-test0-versioned.s3.amazonaws.com/3versions-allversioned.txt\"\n    url_3ver_input = url_3ver + \"?versionId=b.qCuh7Sg58VIYj8TVHzbRS97EvejzEl\"\n    eq_(get_versioned_url(url_3ver_input), url_3ver_input)\n    eq_(get_versioned_url(url_3ver_input, update=True),\n        url_3ver + \"?versionId=Kvuind11HZh._dCPaDAb0OY9dRrQoTMn\")\n\n\n@skip_if_no_network\n@use_cassette('s3_test_version_url_anon')\ndef test_get_versioned_url_anon():\n    # The one without any authenticator, was crashing.\n    # Also it triggered another bug about having . in the bucket name\n    url_on = \"http://openneuro.org.s3.amazonaws.com/ds000001/dataset_description.json\"\n    url_on_versioned = get_versioned_url(url_on)\n    ok_startswith(url_on_versioned, url_on + \"?versionId=\")\n\n\n@skip_if_no_network\n@use_cassette('s3_test_version_url_deleted')\ndef test_version_url_deleted():\n    get_test_providers('s3://datalad-test0-versioned/', reload=True)  # to verify having credentials to access\n    # openfmri via S3\n    # it existed and then was removed\n    fpath = \"1version-removed.txt\"\n    url = \"http://datalad-test0-versioned.s3.amazonaws.com/%s\" % fpath\n    turl = \"http://datalad-test0-versioned.s3.amazonaws.com/%s\" \\\n           \"?versionId=eZ5Hgwo8azfBv3QT7aW9dmm2sbLUY.QP\" % fpath\n    eq_(get_versioned_url(url), turl)\n    # too heavy for verification!\n    #eq_(get_versioned_url(url, verify=True), turl)\n",
            "header": {
                "file": {
                    "path": "datalad/tests/test_s3.py"
                },
                "misc_line": null
            },
            "index_line": {
                "old_commit_hash": "de5cdaf75",
                "new_commit_hash": "422e3943e",
                "mode": "100644"
            },
            "is_binary_file": false,
            "binary_line": null,
            "minus_file": {
                "path": "a/datalad/tests/test_s3.py"
            },
            "plus_file": {
                "path": "b/datalad/tests/test_s3.py"
            },
            "hunks": [
                {
                    "descriptor": {
                        "old_range": {
                            "start": 88,
                            "length": 6
                        },
                        "new_range": {
                            "start": 88,
                            "length": 16
                        },
                        "section": "def test_get_versioned_url():"
                    },
                    "line_group": {
                        "all_lines": [
                            {
                                "content": "        url_3ver + \"?versionId=Kvuind11HZh._dCPaDAb0OY9dRrQoTMn\")",
                                "type": "context"
                            },
                            {
                                "content": "",
                                "type": "context"
                            },
                            {
                                "content": "",
                                "type": "context"
                            },
                            {
                                "content": "@skip_if_no_network",
                                "type": "added"
                            },
                            {
                                "content": "@use_cassette('s3_test_version_url_anon')",
                                "type": "added"
                            },
                            {
                                "content": "def test_get_versioned_url_anon():",
                                "type": "added"
                            },
                            {
                                "content": "    # The one without any authenticator, was crashing.",
                                "type": "added"
                            },
                            {
                                "content": "    # Also it triggered another bug about having . in the bucket name",
                                "type": "added"
                            },
                            {
                                "content": "    url_on = \"http://openneuro.org.s3.amazonaws.com/ds000001/dataset_description.json\"",
                                "type": "added"
                            },
                            {
                                "content": "    url_on_versioned = get_versioned_url(url_on)",
                                "type": "added"
                            },
                            {
                                "content": "    ok_startswith(url_on_versioned, url_on + \"?versionId=\")",
                                "type": "added"
                            },
                            {
                                "content": "",
                                "type": "added"
                            },
                            {
                                "content": "",
                                "type": "added"
                            },
                            {
                                "content": "@skip_if_no_network",
                                "type": "context"
                            },
                            {
                                "content": "@use_cassette('s3_test_version_url_deleted')",
                                "type": "context"
                            },
                            {
                                "content": "def test_version_url_deleted():",
                                "type": "context"
                            },
                            {
                                "content": "",
                                "type": "context"
                            }
                        ]
                    },
                    "modified_entities": [],
                    "added_entities": [
                        {
                            "file_name": "datalad/tests/test_s3.py",
                            "type": "function",
                            "name": "test_get_versioned_url_anon",
                            "content": "def test_get_versioned_url_anon():\n    # The one without any authenticator, was crashing.\n    # Also it triggered another bug about having . in the bucket name\n    url_on = \"http://openneuro.org.s3.amazonaws.com/ds000001/dataset_description.json\"\n    url_on_versioned = get_versioned_url(url_on)\n    ok_startswith(url_on_versioned, url_on + \"?versionId=\")",
                            "ast_type_str": "FunctionDef",
                            "start_lineno": 93,
                            "end_lineno": 98,
                            "parent": null
                        }
                    ],
                    "deleted_entities": []
                }
            ]
        }
    ],
    "old_commit_hash": "4484ab9ed80e70ca24250650ddb46dc575aff245^",
    "new_commit_hash": "4484ab9ed80e70ca24250650ddb46dc575aff245",
    "commit_message": "BF: get_versioned_url - support anonymous acces (no provider) and buckets with . in name",
    "commit_date": "2020-10-05T15:31:40-04:00",
    "metadata": {}
}
{
    "repo_name": "datalad",
    "new_commit_hash": "4484ab9ed80e70ca24250650ddb46dc575aff245",
    "test_file_codes": [
        "# emacs: -*- mode: python; py-indent-offset: 4; tab-width: 4; indent-tabs-mode: nil -*-\n# ex: set sts=4 ts=4 sw=4 noet:\n# ## ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##\n#\n#   See COPYING file distributed along with the datalad package for the\n#   copyright and license terms.\n#\n# ## ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##\n\"\"\"Test S3 supporting functionality\n\n\"\"\"\n\nfrom datalad.support.network import URL\nfrom datalad.support.s3 import add_version_to_url, get_versioned_url\nfrom datalad.tests.utils import (\n    assert_raises,\n    eq_,\n    ok_startswith,\n    skip_if_no_network,\n    use_cassette,\n)\nfrom datalad.downloaders.tests.utils import get_test_providers\n\n\ndef test_add_version_to_url():\n    base_url = \"http://ex.com/f.txt\"\n    base_url_query = \"http://ex.com/f.txt?k=v\"\n    for replace in True, False:\n        eq_(add_version_to_url(URL(base_url), \"new.id\", replace=replace),\n            base_url + \"?versionId=new.id\")\n\n        eq_(add_version_to_url(URL(base_url_query),\n                               \"new.id\", replace=replace),\n            base_url_query + \"&versionId=new.id\")\n\n        expected = \"new.id\" if replace else \"orig.id\"\n        eq_(add_version_to_url(URL(base_url + \"?versionId=orig.id\"),\n                               \"new.id\",\n                               replace=replace),\n            base_url + \"?versionId=\" + expected)\n\n        eq_(add_version_to_url(URL(base_url_query + \"&versionId=orig.id\"),\n                               \"new.id\",\n                               replace=replace),\n            base_url_query + \"&versionId=\" + expected)\n\n\n@skip_if_no_network\n@use_cassette('s3_test_version_url')\ndef test_get_versioned_url():\n    get_test_providers('s3://openfmri/tarballs')  # to verify having credentials to access openfmri via S3\n    for url_pref in ('http://openfmri.s3.amazonaws.com', 'https://s3.amazonaws.com/openfmri'):\n        eq_(get_versioned_url(url_pref + \"/tarballs/ds001_raw.tgz\"),\n            url_pref + \"/tarballs/ds001_raw.tgz?versionId=null\")\n\n        eq_(get_versioned_url(url_pref + \"/tarballs/ds001_raw.tgz?param=1\"),\n            url_pref + \"/tarballs/ds001_raw.tgz?param=1&versionId=null\")\n\n        # We don't duplicate the version if it already exists.\n        eq_(get_versioned_url(url_pref + \"/tarballs/ds001_raw.tgz?versionId=null\"),\n            url_pref + \"/tarballs/ds001_raw.tgz?versionId=null\")\n\n    # something is wrong there\n    #print(get_versioned_url(\"http://openfmri.s3.amazonaws.com/ds001/demographics.txt\"))\n\n    eq_(get_versioned_url(\"someurl\"), \"someurl\")  # should just return original one\n    assert_raises(RuntimeError, get_versioned_url, \"someurl\", guarantee_versioned=True)\n\n    # TODO: on a bucket without versioning\n    url = \"http://datalad-test0-nonversioned.s3.amazonaws.com/2versions-removed-recreated.txt\"\n    eq_(get_versioned_url(url), url)\n    eq_(get_versioned_url(url, return_all=True), [url])\n\n    assert_raises(NotImplementedError, get_versioned_url, \"s3://buga\")\n\n    urls = get_versioned_url(\"http://datalad-test0-versioned.s3.amazonaws.com/2versions-removed-recreated.txt\",\n                             return_all=True, verify=True)\n    eq_(len(set(urls)), len(urls))  # all unique\n    for url in urls:\n        # so we didn't grab other files along with the same prefix\n        ok_startswith(url, 'http://datalad-test0-versioned.s3.amazonaws.com/2versions-removed-recreated.txt?versionId=')\n\n    # Update a versioned URL with a newer version tag.\n    url_3ver = \"http://datalad-test0-versioned.s3.amazonaws.com/3versions-allversioned.txt\"\n    url_3ver_input = url_3ver + \"?versionId=b.qCuh7Sg58VIYj8TVHzbRS97EvejzEl\"\n    eq_(get_versioned_url(url_3ver_input), url_3ver_input)\n    eq_(get_versioned_url(url_3ver_input, update=True),\n        url_3ver + \"?versionId=Kvuind11HZh._dCPaDAb0OY9dRrQoTMn\")\n\n\n@skip_if_no_network\n@use_cassette('s3_test_version_url_anon')\ndef test_get_versioned_url_anon():\n    # The one without any authenticator, was crashing.\n    # Also it triggered another bug about having . in the bucket name\n    url_on = \"http://openneuro.org.s3.amazonaws.com/ds000001/dataset_description.json\"\n    url_on_versioned = get_versioned_url(url_on)\n    ok_startswith(url_on_versioned, url_on + \"?versionId=\")\n\n\n@skip_if_no_network\n@use_cassette('s3_test_version_url_deleted')\ndef test_version_url_deleted():\n    get_test_providers('s3://datalad-test0-versioned/', reload=True)  # to verify having credentials to access\n    # openfmri via S3\n    # it existed and then was removed\n    fpath = \"1version-removed.txt\"\n    url = \"http://datalad-test0-versioned.s3.amazonaws.com/%s\" % fpath\n    turl = \"http://datalad-test0-versioned.s3.amazonaws.com/%s\" \\\n           \"?versionId=eZ5Hgwo8azfBv3QT7aW9dmm2sbLUY.QP\" % fpath\n    eq_(get_versioned_url(url), turl)\n    # too heavy for verification!\n    #eq_(get_versioned_url(url, verify=True), turl)\n",
        "import pytest\nimport tempfile\nimport os\n\n\n@pytest.fixture\ndef path():\n    with tempfile.TemporaryDirectory() as tmpdir:\n        yield tmpdir\n\n\n@pytest.fixture(autouse=True)\ndef setup_git_config():\n    with tempfile.TemporaryDirectory() as home:\n        old_home = os.environ.get(\"HOME\")\n        os.environ[\"HOME\"] = home\n        os.system('git config --global user.name \"DataLad Tester\"')\n        os.system('git config --global user.email \"test@example.com\"')\n        yield\n        if old_home:\n            os.environ[\"HOME\"] = old_home\n"
    ],
    "test_file_names": [
        "test_1.py",
        "conftest.py"
    ],
    "setup_res_code": 0,
    "setup_res_stdout": "Starting Datalad installation attempts...\nVerifying installation...\nDatalad version: 0.13.3.dev143\n✅ Installation successful!\nSuccessfully installed Datalad using Python 3.9\n",
    "setup_res_stderr": "Using CPython 3.9.21\nCreating virtual environment at: .venv\nActivate with: source .venv/bin/activate\nResolved 25 packages in 146ms\nInstalled 25 packages in 3.78s\n + coverage==7.6.10\n + docopt==0.6.2\n + exceptiongroup==1.2.2\n + grabbit==0.2.6\n + importlib-resources==6.4.5\n + iniconfig==2.0.0\n + nibabel==5.3.2\n + num2words==0.5.14\n + numpy==2.0.2\n + packaging==24.2\n + pandas==2.2.3\n + patsy==1.0.1\n + pluggy==1.5.0\n + pybids==0.6.5\n + pytest==8.3.4\n + pytest-cov==6.0.0\n + python-dateutil==2.9.0.post0\n + pytz==2024.2\n + scipy==1.13.1\n + setuptools==75.6.0\n + six==1.17.0\n + tomli==2.2.1\n + typing-extensions==4.12.2\n + tzdata==2024.2\n + zipp==3.21.0\nResolved 63 packages in 4.36s\nPrepared 1 package in 4.15s\nInstalled 57 packages in 478ms\n + annexremote==1.6.6\n + appdirs==1.4.4\n + backports-tarfile==1.2.0\n + beautifulsoup4==4.12.3\n + boto==2.49.0\n + certifi==2024.12.14\n + cffi==1.17.1\n + chardet==5.2.0\n + charset-normalizer==3.4.1\n + citeproc-py==0.6.0\n + cryptography==44.0.0\n + datalad==0.13.3 (from file:///home/gcpuser/buckets/local_repoeval_bucket/repos/datalad_4484ab9ed80e70ca24250650ddb46dc575aff245)\n + deprecated==1.2.15\n + distro==1.9.0\n + duecredit==0.10.2\n + exifread==3.0.0\n + fasteners==0.19\n + httpretty==1.1.4\n + humanize==4.11.0\n + idna==3.10\n + importlib-metadata==8.5.0\n + iso8601==2.1.0\n + jaraco-classes==3.4.0\n + jaraco-context==6.0.1\n + jaraco-functools==4.1.0\n + jeepney==0.8.0\n + jsmin==3.0.1\n + keyring==25.6.0\n + keyrings-alt==5.0.2\n + looseversion==1.3.0\n + lxml==5.3.0\n + more-itertools==10.5.0\n + msgpack==1.1.0\n + multidict==6.1.0\n + mutagen==1.47.0\n + nose==1.3.7\n + patool==1.15.0\n + pillow==11.0.0\n + propcache==0.2.1\n + pycparser==2.22\n + pygithub==2.5.0\n + pyjwt==2.10.1\n + pynacl==1.5.0\n + pyperclip==1.9.0\n + python-xmp-toolkit==2.0.2\n + pyyaml==6.0.2\n + requests==2.32.3\n + requests-ftp==0.3.1\n + secretstorage==3.3.3\n + simplejson==3.19.3\n + soupsieve==2.6\n + tqdm==4.67.1\n + urllib3==1.26.20\n + vcrpy==7.0.0\n + whoosh==2.7.4\n + wrapt==1.17.0\n + yarl==1.18.3\nResolved 97 packages in 257ms\nInstalled 32 packages in 728ms\n + alabaster==0.7.16\n + asv==0.6.4\n + asv-runner==0.2.1\n + babel==2.16.0\n + build==1.2.2.post1\n + distlib==0.3.9\n + docutils==0.21.2\n + filelock==3.16.1\n + gprof2dot==2024.6.6\n + imagesize==1.4.1\n + jinja2==3.1.5\n + json5==0.10.0\n + markupsafe==3.0.2\n + nose-timer==1.0.1\n + platformdirs==4.3.6\n + psutil==6.1.1\n + pygments==2.18.0\n + pympler==1.1\n + pypandoc==1.14\n + pyproject-hooks==1.2.0\n + snowballstemmer==2.2.0\n + sphinx==7.4.7\n + sphinx-rtd-theme==3.0.2\n + sphinxcontrib-applehelp==2.0.0\n + sphinxcontrib-devhelp==2.0.0\n + sphinxcontrib-htmlhelp==2.1.0\n + sphinxcontrib-jquery==4.1\n + sphinxcontrib-jsmath==1.0.1\n + sphinxcontrib-qthelp==2.0.0\n + sphinxcontrib-serializinghtml==2.0.0\n + tabulate==0.9.0\n + virtualenv==20.28.0\n",
    "new_commit_res_code": 0,
    "new_commit_res_stdout": "============================= test session starts ==============================\nplatform linux -- Python 3.9.21, pytest-8.3.4, pluggy-1.5.0\nrootdir: /home/gcpuser/buckets/local_repoeval_bucket/repos/datalad_4484ab9ed80e70ca24250650ddb46dc575aff245\nplugins: cov-6.0.0\ncollected 4 items\n\nr2e_tests/test_1.py .s.s                                                 [100%]\n\n==================================== PASSES ====================================\n_________________________ test_get_versioned_url_anon __________________________\n----------------------------- Captured stderr call -----------------------------\n[INFO] S3 session: Connecting to the bucket openneuro.org anonymously \n------------------------------ Captured log call -------------------------------\nINFO     datalad.s3:s3.py:117 S3 session: Connecting to the bucket openneuro.org anonymously\n=========================== short test summary info ============================\nPASSED r2e_tests/test_1.py::test_add_version_to_url\nPASSED r2e_tests/test_1.py::test_get_versioned_url_anon\nSKIPPED [2] .venv/lib/python3.9/site-packages/_pytest/unittest.py:385: This test requires known credentials for datalad-test-s3\n========================= 2 passed, 2 skipped in 3.15s =========================\n",
    "new_commit_res_stderr": "",
    "old_commit_res_code": 1,
    "old_commit_res_stdout": "============================= test session starts ==============================\nplatform linux -- Python 3.9.21, pytest-8.3.4, pluggy-1.5.0\nrootdir: /home/gcpuser/buckets/local_repoeval_bucket/repos/datalad_4484ab9ed80e70ca24250650ddb46dc575aff245\nplugins: cov-6.0.0\ncollected 4 items\n\nr2e_tests/test_1.py .sFs                                                 [100%]\n\n=================================== FAILURES ===================================\n_________________________ test_get_versioned_url_anon __________________________\n\n    @skip_if_no_network\n    @use_cassette('s3_test_version_url_anon')\n    def test_get_versioned_url_anon():\n        # The one without any authenticator, was crashing.\n        # Also it triggered another bug about having . in the bucket name\n        url_on = \"http://openneuro.org.s3.amazonaws.com/ds000001/dataset_description.json\"\n>       url_on_versioned = get_versioned_url(url_on)\n\nr2e_tests/test_1.py:97: \n_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ \ndatalad/support/s3.py:490: in get_versioned_url\n    bucket = s3provider.authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)\ndatalad/downloaders/s3.py:106: in authenticate\n    credentials = credential()\ndatalad/downloaders/credentials.py:152: in __call__\n    v = self._ask_and_set(f)\ndatalad/downloaders/credentials.py:110: in _ask_and_set\n    v = self._ask_field_value(f, instructions=instructions)\ndatalad/downloaders/credentials.py:104: in _ask_field_value\n    return ui.question(\n_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ \n\nself = SilentConsoleLog(out=<EncodedFile>), text = 'key_id'\ntitle = \"You need to authenticate with 'datalad-test-s3' credentials. team@datalad.org provides information on how to gain access\"\nkwargs = {'hidden': False}\nmsg = \"A non-interactive silent UI was asked for a response to a question: key_id. Title: You need to authenticate with 'dat...-test-s3' credentials. team@datalad.org provides information on how to gain access. Additional arguments: hidden=False\"\nkwargs_str = 'hidden=False'\n\n    def question(self, text, title=None, **kwargs):\n        msg = \"A non-interactive silent UI was asked for a response to a question: %s.\" % text\n        if title is not None:\n            msg += ' Title: %s.' % title\n        if not kwargs.get('hidden'):\n            kwargs_str = ', '.join(\n                ('%s=%r' % (k, v)\n                for k, v in kwargs.items()\n                if v is not None))\n            if kwargs_str:\n                msg += \" Additional arguments: %s\" % kwargs_str\n        else:\n            msg += \" Additional arguments are not shown because 'hidden' is set.\"\n>       raise RuntimeError(msg)\nE       RuntimeError: A non-interactive silent UI was asked for a response to a question: key_id. Title: You need to authenticate with 'datalad-test-s3' credentials. team@datalad.org provides information on how to gain access. Additional arguments: hidden=False\n\ndatalad/ui/dialog.py:139: RuntimeError\n==================================== PASSES ====================================\n=========================== short test summary info ============================\nPASSED r2e_tests/test_1.py::test_add_version_to_url\nSKIPPED [2] .venv/lib/python3.9/site-packages/_pytest/unittest.py:385: This test requires known credentials for datalad-test-s3\nFAILED r2e_tests/test_1.py::test_get_versioned_url_anon - RuntimeError: A non...\n==================== 1 failed, 1 passed, 2 skipped in 0.82s ====================\n",
    "old_commit_res_stderr": ""
}
datalad/support/s3.py datalad/tests/test_s3.py
We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
[ISSUE]
**Title:** Authentication Error When Accessing S3 Buckets Containing '.' Using Anonymous Access

**Description:**
When attempting to retrieve a versioned URL for an S3 bucket that includes a dot (`.`) in its name without providing authentication credentials, the `get_versioned_url` function fails unexpectedly.

**Example Buggy Code:**
```python
from datalad.support.s3 import get_versioned_url

url = "http://openneuro.org.s3.amazonaws.com/ds000001/dataset_description.json"
versioned_url = get_versioned_url(url)
print(versioned_url)
```
*This code is intended to append a `versionId` query parameter to the provided S3 URL without requiring authentication.*

**Expected Behavior:**
The function should successfully return the versioned URL with the `?versionId=` appended, enabling access without the need for authentication when no provider is specified.

**Actual Behavior:**
The function raises a `RuntimeError` indicating that authentication is required:
```
RuntimeError: A non-interactive silent UI was asked for a response to a question: key_id. Title: You need to authenticate with 'datalad-test-s3' credentials. team@datalad.org provides information on how to gain access. Additional arguments: hidden=False
```
*This error occurs because the function does not handle S3 bucket names containing dots when no authentication provider is supplied.*

[/ISSUE]
--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.

--- BEGIN FILE ---
```
### datalad/support/s3.py
# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8  -*-
# vi: set ft=python sts=4 ts=4 sw=4 et:
### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##
#
#   See COPYING file distributed along with the datalad package for the
#   copyright and license terms.
#
### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##g
"""Variety of helpers to deal with AWS S3

Use as a script to generate test buckets via e.g.

    python -m datalad.support.s3 generate test1_dirs
"""

__docformat__ = 'restructuredtext'

import mimetypes

from os.path import splitext
import re

from datalad.support.network import urlquote, URL

import logging
import datalad.log  # Just to have lgr setup happen this one used a script
lgr = logging.getLogger('datalad.s3')

from datalad.dochelpers import exc_str
from datalad.support.exceptions import (
    DownloadError,
    AccessDeniedError,
    AccessPermissionExpiredError,
    AnonymousAccessDeniedError,
)
from datalad.utils import try_multiple_dec

from urllib.request import urlopen, Request


try:
    import boto
    from boto.s3.key import Key
    from boto.exception import S3ResponseError
    from boto.s3.connection import OrdinaryCallingFormat
except Exception as e:
    if not isinstance(e, ImportError):
        lgr.warning("boto module failed to import although available: %s" % exc_str(e))
    boto = Key = S3ResponseError = OrdinaryCallingFormat = None


# TODO: should become a config option and managed along with the rest
S3_ADMIN_CREDENTIAL = "datalad-datalad-admin-s3"
S3_TEST_CREDENTIAL = "datalad-datalad-test-s3"


def _get_bucket_connection(credential):
    # eventually we should be able to have multiple credentials associated
    # with different resources. Thus for now just making an option which
    # one to use
    # do full shebang with entering credentials
    from datalad.downloaders.credentials import AWS_S3
    credential = AWS_S3(credential, None)
    if not credential.is_known:
        credential.enter_new()
    creds = credential()
    return boto.connect_s3(creds["key_id"], creds["secret_id"])


def _handle_exception(e, bucket_name):
    """Helper to handle S3 connection exception"""
    raise (
        AccessDeniedError
        if e.error_code == 'AccessDenied'
        else DownloadError)(
            "Cannot connect to %s S3 bucket. Exception: %s"
            % (bucket_name, exc_str(e))
        )


def _check_S3ResponseError(e):
    """Returns True if should be retried.

    raises ... if token has expired"""
    # https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html#ErrorCodeList
    if e.status in (
                    307,  # MovedTemporarily -- DNS updates etc
                    503,  # Slow down -- too many requests, so perfect fit to sleep a bit
                    ):
        return True
    if e.status == 400:
        # Generic Bad Request -- could be many things! generally -- we retry, but
        # some times provide more directed reaction
        # ATM, as used, many requests we send with boto might be just HEAD requests
        # (if I got it right) and we would not receive BODY back with the detailed
        # error_code.  Then we will allow to retry until we get something we know how to
        # handle it more specifically
        if e.error_code == 'ExpiredToken':
            raise AccessPermissionExpiredError("Used token to access S3 has expired: %s" % exc_str(e))
        elif not e.error_code:
            lgr.log(5, "Empty error_code in %s", e)
        return True
    return False


def try_multiple_dec_s3(func):
    """An S3 specific adapter to @try_multiple_dec

    To decorate func to try multiple times after some sleep upon encountering
    some intermittent error from S3
    """
    return try_multiple_dec(
                ntrials=4,
                duration=2.,
                increment_type='exponential',
                exceptions=S3ResponseError,
                exceptions_filter=_check_S3ResponseError,
                logger=lgr.debug,
    )(func)


def get_bucket(conn, bucket_name):
    """A helper to get a bucket

    Parameters
    ----------
    bucket_name: str
        Name of the bucket to connect to
    """
    try:
        return try_multiple_dec_s3(conn.get_bucket)(bucket_name)
    except S3ResponseError as e:
        # can initially deny or error to connect to the specific bucket by name,
        # and we would need to list which buckets are available under following
        # credentials:
        lgr.debug("Cannot access bucket %s by name with validation: %s",
                  bucket_name, exc_str(e))
        if conn.anon:
            raise AnonymousAccessDeniedError(
                "Access to the bucket %s did not succeed.  Requesting "
                "'all buckets' for anonymous S3 connection makes "
                "little sense and thus not supported." % bucket_name,
                supported_types=['aws-s3']
            )

        if e.reason == "Forbidden":
            # Could be just HEAD call boto issues is not allowed, and we should not
            # try to verify that bucket is "reachable".  Just carry on
            try:
                return try_multiple_dec_s3(conn.get_bucket)(bucket_name, validate=False)
            except S3ResponseError as e2:
                lgr.debug("Cannot access bucket %s even without validation: %s",
                          bucket_name, exc_str(e2))
                _handle_exception(e, bucket_name)

        try:
            all_buckets = try_multiple_dec_s3(conn.get_all_buckets)()
            all_bucket_names = [b.name for b in all_buckets]
            lgr.debug("Found following buckets %s", ', '.join(all_bucket_names))
            if bucket_name in all_bucket_names:
                return all_buckets[all_bucket_names.index(bucket_name)]
        except S3ResponseError as e2:
            lgr.debug("Cannot access all buckets: %s", exc_str(e2))
            _handle_exception(e, 'any (originally requested %s)' % bucket_name)
        else:
            _handle_exception(e, bucket_name)


class VersionedFilesPool(object):
    """Just a helper which would help to create versioned files in the bucket"""
    def __init__(self, bucket):
        self._versions = {}
        self._bucket = bucket

    @property
    def bucket(self):
        return self._bucket

    def __call__(self, filename, prefix='', load=None):
        self._versions[filename] = version = self._versions.get(filename, 0) + 1
        version_str = "version%d" % version
        # if we are to upload fresh content
        k = Key(self._bucket)
        k.key = filename
        #k.set_contents_from_filename('/home/yoh/.emacs')
        base, ext = splitext(filename)
        #content_type = None
        mtype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'
        headers = {'Content-Type': mtype}

        if load is None:
            load = prefix
            if ext == 'html':
                load += '<html><body>%s</body></html>' % version_str
            else:
                load += version_str

        k.set_contents_from_string(load, headers=headers)
        return k

    def reset_version(self, filename):
        self._versions[filename] = 0


def get_key_url(e, schema='http', versioned=True):
    """Generate an s3:// or http:// url given a key

    if versioned url is requested but version_id is None, no versionId suffix
    will be added
    """
    # TODO: here we would need to encode the name since urlquote actually
    # can't do that on its own... but then we should get a copy of the thing
    # so we could still do the .format....
    # ... = e.name.encode('utf-8')  # unicode isn't advised in URLs
    e.name_urlquoted = urlquote(e.name)
    if schema == 'http':
        fmt = "http://{e.bucket.name}.s3.amazonaws.com/{e.name_urlquoted}"
    elif schema == 's3':
        fmt = "s3://{e.bucket.name}/{e.name_urlquoted}"
    else:
        raise ValueError(schema)
    if versioned and e.version_id is not None:
        fmt += "?versionId={e.version_id}"
    return fmt.format(e=e)


def prune_and_delete_bucket(bucket):
    """Deletes all the content and then deletes bucket

    Should be used with care -- no confirmation requested
    """
    bucket.delete_keys(bucket.list_versions(''))
    # this one doesn't work since it generates DeleteMarkers instead ;)
    #for key in b.list_versions(''):
    #    b.delete_key(key)
    bucket.delete()
    lgr.info("Bucket %s was removed" % bucket.name)


def set_bucket_public_access_policy(bucket):
    # we need to enable permissions for making content available
    bucket.set_policy("""{
      "Version":"2012-10-17",
      "Statement":[{
          "Sid":"AddPerm",
          "Effect":"Allow",
          "Principal": "*",
          "Action":["s3:GetObject", "s3:GetObjectVersion", "s3:GetObjectTorrent", "s3:GetObjectVersionTorrent"],
          "Resource":["arn:aws:s3:::%s/*"]
        }
      ]
    }""" % bucket.name)


def gen_test_bucket(bucket_name):
    conn = _get_bucket_connection(S3_ADMIN_CREDENTIAL)
    # assure we have none
    try:
        bucket = conn.get_bucket(bucket_name)
        lgr.info("Deleting existing bucket %s" % bucket.name)
        prune_and_delete_bucket(bucket)
    except:  # MIH: MemoryError?
        # so nothing to worry about
        pass
    finally:
        pass

    return conn.create_bucket(bucket_name)


def _gen_bucket_test0(bucket_name="datalad-test0", versioned=True):

    bucket = gen_test_bucket(bucket_name)

    # Enable web access to that bucket to everyone
    bucket.configure_website('index.html')
    set_bucket_public_access_policy(bucket)

    files = VersionedFilesPool(bucket)

    files("1version-nonversioned1.txt")
    files("2versions-nonversioned1.txt")

    if versioned:
        # make bucket versioned AFTER we uploaded one file already
        bucket.configure_versioning(True)

    files("2versions-nonversioned1.txt")
    files("2versions-nonversioned1.txt_sameprefix")
    for v in range(3):
        files("3versions-allversioned.txt")
    files("3versions-allversioned.txt_sameprefix")  # to test possible problems

    # File which was created and then removed
    bucket.delete_key(files("1version-removed.txt"))

    # File which was created/removed/recreated (with new content)
    bucket.delete_key(files("2versions-removed-recreated.txt"))
    files("2versions-removed-recreated.txt")
    files("2versions-removed-recreated.txt_sameprefix")

    # File which was created/removed/recreated (with new content)
    f = "1version-removed-recreated.txt"
    bucket.delete_key(files(f))
    files.reset_version(f)
    files(f)
    lgr.info("Bucket %s was generated and populated" % bucket_name)

    return bucket


def gen_bucket_test0_versioned():
    return _gen_bucket_test0('datalad-test0-versioned', versioned=True)


def gen_bucket_test0_nonversioned():
    return _gen_bucket_test0('datalad-test0-nonversioned', versioned=False)


def gen_bucket_test1_dirs():
    bucket_name = 'datalad-test1-dirs-versioned'
    bucket = gen_test_bucket(bucket_name)
    bucket.configure_versioning(True)

    # Enable web access to that bucket to everyone
    bucket.configure_website('index.html')
    set_bucket_public_access_policy(bucket)

    files = VersionedFilesPool(bucket)

    files("d1", load="")  # creating an empty file
    # then we would like to remove that d1 as a file and make a directory out of it
    files("d1/file1.txt")
    # and then delete it and place it back
    files("d1", load="smth")


def gen_bucket_test2_obscurenames_versioned():
    # in principle bucket name could also contain ., but boto doesn't digest it
    # well
    bucket_name = 'datalad-test2-obscurenames-versioned'
    bucket = gen_test_bucket(bucket_name)
    bucket.configure_versioning(True)

    # Enable web access to that bucket to everyone
    bucket.configure_website('index.html')
    set_bucket_public_access_policy(bucket)

    files = VersionedFilesPool(bucket)

    # http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
    files("f 1", load="")
    files("f [1][2]")
    # Need to grow up for this .... TODO
    #files(u"юникод")
    #files(u"юни/код")
    # all fancy ones at once
    files("f!-_.*'( )")
    # the super-fancy which aren't guaranteed to be good idea (as well as [] above)
    files("f &$=@:+,?;")


def gen_bucket_test1_manydirs():
    # to test crawling with flexible subdatasets making decisions
    bucket_name = 'datalad-test1-manydirs-versioned'
    bucket = gen_test_bucket(bucket_name)
    bucket.configure_versioning(True)

    # Enable web access to that bucket to everyone
    bucket.configure_website('index.html')
    set_bucket_public_access_policy(bucket)

    files = VersionedFilesPool(bucket)

    files("d1", load="")  # creating an empty file
    # then we would like to remove that d1 as a file and make a directory out of it
    files("d1/file1.txt")
    files("d1/sd1/file1.txt")
    files("d1/sd2/file3.txt", load="a")
    files("d1/sd2/ssd1/file4.txt")
    files("d2/file1.txt")
    files("d2/sd1/file1.txt")
    files("d2/sd1/ssd/sssd/file1.txt")


def add_version_to_url(url, version, replace=False):
    """Add a version ID to `url`.

    Parameters
    ----------
    url : datalad.support.network.URL
        A URL.
    version : str
        The value of 'versionId='.
    replace : boolean, optional
        If a versionID is already present in `url`, replace it.

    Returns
    -------
    A versioned URL (str)
    """
    version_id = "versionId={}".format(version)
    if not url.query:
        query = version_id
    else:
        ver_match = re.match("(?P<pre>.*&)?"
                             "(?P<vers>versionId=[^&]+)"
                             "(?P<post>&.*)?",
                             url.query)
        if ver_match:
            if replace:
                query = "".join([ver_match.group("pre") or "",
                                 version_id,
                                 ver_match.group("post") or ""])
            else:
                query = url.query
        else:
            query = url.query + "&" + version_id
    return URL(**dict(url.fields, query=query)).as_str()


def get_versioned_url(url, guarantee_versioned=False, return_all=False, verify=False,
                      s3conn=None, update=False):
    """Given a url return a versioned URL

    Originally targeting AWS S3 buckets with versioning enabled

    Parameters
    ----------
    url : string
    guarantee_versioned : bool, optional
      Would fail if buckets is determined to have no versioning enabled.
      It will not fail if we fail to determine if bucket is versioned or
      not
    return_all: bool, optional
      If True, would return a list with URLs for all the versions of this
      file, sorted chronologically with latest first (when possible, e.g.
      for S3).  Remove markers get ignored
    verify: bool, optional
      Verify that URL is accessible. As discovered some versioned keys might
      be denied access to
    update : bool, optional
      If the URL already contains a version ID, update it to the latest version
      ID.  This option has no effect if return_all is true.

    Returns
    -------
    string or list of string
    """
    url_rec = URL(url)

    s3_bucket, fpath = None, url_rec.path.lstrip('/')

    was_versioned = False
    all_versions = []

    if url_rec.hostname.endswith('.s3.amazonaws.com'):
        if url_rec.scheme not in ('http', 'https'):
            raise ValueError("Do not know how to handle %s scheme" % url_rec.scheme)
        # we know how to slice this cat
        s3_bucket = url_rec.hostname.split('.', 1)[0]
    elif url_rec.hostname == 's3.amazonaws.com':
        if url_rec.scheme not in ('http', 'https'):
            raise ValueError("Do not know how to handle %s scheme" % url_rec.scheme)
        # url is s3.amazonaws.com/bucket/PATH
        s3_bucket, fpath = fpath.split('/', 1)
    elif url_rec.scheme == 's3':
        s3_bucket = url_rec.hostname  # must be
        if url_rec.query and 'versionId=' in url_rec.query:
            was_versioned = True
            all_versions.append(url)
        else:
            # and for now implement magical conversion to URL
            # TODO: wouldn't work if needs special permissions etc
            # actually for now
            raise NotImplementedError

    if s3_bucket:
        # TODO: cache
        if s3conn is None:
            # we need to reuse our providers
            from ..downloaders.providers import Providers
            providers = Providers.from_config_files()
            s3url = "s3://%s/" % s3_bucket
            s3provider = providers.get_provider(s3url)
            if s3provider.authenticator.bucket is not None and s3provider.authenticator.bucket.name == s3_bucket:
                # we have established connection before, so let's just reuse
                bucket = s3provider.authenticator.bucket
            else:
                bucket = s3provider.authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)
        else:
            bucket = s3conn.get_bucket(s3_bucket)

        supports_versioning = True  # assume that it does
        try:
            supports_versioning = bucket.get_versioning_status()  # TODO cache
        except S3ResponseError as e:
            # might be forbidden, i.e. "403 Forbidden" so we try then anyways
            supports_versioning = 'maybe'

        if supports_versioning:
            all_keys = bucket.list_versions(fpath)
            # Filter and sort them so the newest one on top
            all_keys = [x for x in sorted(all_keys, key=lambda x: (x.last_modified, x.is_latest))
                        if ((x.name == fpath)  # match exact name, not just prefix
                            )
                        ][::-1]
            # our current assumptions
            assert(all_keys[0].is_latest)
            # and now filter out delete markers etc
            all_keys = [x for x in all_keys if isinstance(x, Key)]  # ignore DeleteMarkers
            assert(all_keys)

            for key in all_keys:
                url_versioned = add_version_to_url(
                    url_rec, key.version_id, replace=update and not return_all)

                all_versions.append(url_versioned)
                if verify:
                    # it would throw HTTPError exception if not accessible
                    _ = urlopen(Request(url_versioned))
                was_versioned = True
                if not return_all:
                    break

    if guarantee_versioned and not was_versioned:
        raise RuntimeError("Could not version %s" % url)

    if not all_versions:
        # we didn't get a chance
        all_versions = [url_rec.as_str()]

    if return_all:
        return all_versions
    else:
        return all_versions[0]


if __name__ == '__main__':
    import sys
    lgr.setLevel(logging.INFO)
    # TODO: proper cmdline
    if len(sys.argv) > 1 and sys.argv[1] == "generate":
        if len(sys.argv) < 3:
            raise ValueError("Say 'all' to regenerate all, or give a generators name")
        name = sys.argv[2]
        if name.lower() == 'all':
            for f in locals().keys():
                if f.startswith('gen_bucket_'):
                    locals()[f]()
        else:
            locals()['gen_bucket_%s' % name]()
    else:
        print("nothing todo")

```
--- END FILE ---

Please first localize the bug based on the issue statement, and then generate *SEARCH/REPLACE* edits to fix the issue.

Every *SEARCH/REPLACE* edit must use this format:
1. The file path
2. The start of search block: <<<<<<< SEARCH
3. A contiguous chunk of lines to search for in the existing source code
4. The dividing line: =======
5. The lines to replace into the source code
6. The end of the replace block: >>>>>>> REPLACE

Here is an example:

```python
### mathweb/flask/app.py
<<<<<<< SEARCH
from flask import Flask
=======
import math
from flask import Flask
>>>>>>> REPLACE
```
</solution>

Please note that the *SEARCH/REPLACE* edit REQUIRES PROPER INDENTATION. If you would like to add the line '        print(x)', you must fully write that out, with all those spaces before the code!
Wrap each *SEARCH/REPLACE* edit in a code block as shown in the example above. If you have multiple *SEARCH/REPLACE* edits, use a separate code block for each one.
[ISSUE]
**Title:** Authentication Error When Accessing S3 Buckets Containing '.' Using Anonymous Access

**Description:**
When attempting to retrieve a versioned URL for an S3 bucket that includes a dot (`.`) in its name without providing authentication credentials, the `get_versioned_url` function fails unexpectedly.

**Example Buggy Code:**
```python
from datalad.support.s3 import get_versioned_url

url = "http://openneuro.org.s3.amazonaws.com/ds000001/dataset_description.json"
versioned_url = get_versioned_url(url)
print(versioned_url)
```
*This code is intended to append a `versionId` query parameter to the provided S3 URL without requiring authentication.*

**Expected Behavior:**
The function should successfully return the versioned URL with the `?versionId=` appended, enabling access without the need for authentication when no provider is specified.

**Actual Behavior:**
The function raises a `RuntimeError` indicating that authentication is required:
```
RuntimeError: A non-interactive silent UI was asked for a response to a question: key_id. Title: You need to authenticate with 'datalad-test-s3' credentials. team@datalad.org provides information on how to gain access. Additional arguments: hidden=False
```
*This error occurs because the function does not handle S3 bucket names containing dots when no authentication provider is supplied.*

[/ISSUE]
{
    "test_add_version_to_url": "PASSED",
    "test_get_versioned_url_anon": "PASSED"
}
diff --git a/datalad/support/s3.py b/datalad/support/s3.py
index 6336a6d44..cbecf4e14 100644
--- a/datalad/support/s3.py
+++ b/datalad/support/s3.py
@@ -457,8 +457,8 @@ def get_versioned_url(url, guarantee_versioned=False, return_all=False, verify=F
     if url_rec.hostname.endswith('.s3.amazonaws.com'):
         if url_rec.scheme not in ('http', 'https'):
             raise ValueError("Do not know how to handle %s scheme" % url_rec.scheme)
-        # we know how to slice this cat
-        s3_bucket = url_rec.hostname.split('.', 1)[0]
+        # bucket name could have . in it, e.g. openneuro.org
+        s3_bucket = url_rec.hostname[:-len('.s3.amazonaws.com')]
     elif url_rec.hostname == 's3.amazonaws.com':
         if url_rec.scheme not in ('http', 'https'):
             raise ValueError("Do not know how to handle %s scheme" % url_rec.scheme)
@@ -483,11 +483,16 @@ def get_versioned_url(url, guarantee_versioned=False, return_all=False, verify=F
             providers = Providers.from_config_files()
             s3url = "s3://%s/" % s3_bucket
             s3provider = providers.get_provider(s3url)
-            if s3provider.authenticator.bucket is not None and s3provider.authenticator.bucket.name == s3_bucket:
+            authenticator = s3provider.authenticator
+            if not authenticator:
+                # We will use anonymous one
+                from ..downloaders.s3 import S3Authenticator
+                authenticator = S3Authenticator()
+            if authenticator.bucket is not None and authenticator.bucket.name == s3_bucket:
                 # we have established connection before, so let's just reuse
-                bucket = s3provider.authenticator.bucket
+                bucket = authenticator.bucket
             else:
-                bucket = s3provider.authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)
+                bucket = authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)
         else:
             bucket = s3conn.get_bucket(s3_bucket)
 

{"datalad/support/s3.py": "# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8  -*-\n# vi: set ft=python sts=4 ts=4 sw=4 et:\n### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##\n#\n#   See COPYING file distributed along with the datalad package for the\n#   copyright and license terms.\n#\n### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##g\n\"\"\"Variety of helpers to deal with AWS S3\n\nUse as a script to generate test buckets via e.g.\n\n    python -m datalad.support.s3 generate test1_dirs\n\"\"\"\n\n__docformat__ = 'restructuredtext'\n\nimport mimetypes\n\nfrom os.path import splitext\nimport re\n\nfrom datalad.support.network import urlquote, URL\n\nimport logging\nimport datalad.log  # Just to have lgr setup happen this one used a script\nlgr = logging.getLogger('datalad.s3')\n\nfrom datalad.dochelpers import exc_str\nfrom datalad.support.exceptions import (\n    DownloadError,\n    AccessDeniedError,\n    AccessPermissionExpiredError,\n    AnonymousAccessDeniedError,\n)\nfrom datalad.utils import try_multiple_dec\n\nfrom urllib.request import urlopen, Request\n\n\ntry:\n    import boto\n    from boto.s3.key import Key\n    from boto.exception import S3ResponseError\n    from boto.s3.connection import OrdinaryCallingFormat\nexcept Exception as e:\n    if not isinstance(e, ImportError):\n        lgr.warning(\"boto module failed to import although available: %s\" % exc_str(e))\n    boto = Key = S3ResponseError = OrdinaryCallingFormat = None\n\n\n# TODO: should become a config option and managed along with the rest\nS3_ADMIN_CREDENTIAL = \"datalad-datalad-admin-s3\"\nS3_TEST_CREDENTIAL = \"datalad-datalad-test-s3\"\n\n\ndef _get_bucket_connection(credential):\n    # eventually we should be able to have multiple credentials associated\n    # with different resources. Thus for now just making an option which\n    # one to use\n    # do full shebang with entering credentials\n    from datalad.downloaders.credentials import AWS_S3\n    credential = AWS_S3(credential, None)\n    if not credential.is_known:\n        credential.enter_new()\n    creds = credential()\n    return boto.connect_s3(creds[\"key_id\"], creds[\"secret_id\"])\n\n\ndef _handle_exception(e, bucket_name):\n    \"\"\"Helper to handle S3 connection exception\"\"\"\n    raise (\n        AccessDeniedError\n        if e.error_code == 'AccessDenied'\n        else DownloadError)(\n            \"Cannot connect to %s S3 bucket. Exception: %s\"\n            % (bucket_name, exc_str(e))\n        )\n\n\ndef _check_S3ResponseError(e):\n    \"\"\"Returns True if should be retried.\n\n    raises ... if token has expired\"\"\"\n    # https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html#ErrorCodeList\n    if e.status in (\n                    307,  # MovedTemporarily -- DNS updates etc\n                    503,  # Slow down -- too many requests, so perfect fit to sleep a bit\n                    ):\n        return True\n    if e.status == 400:\n        # Generic Bad Request -- could be many things! generally -- we retry, but\n        # some times provide more directed reaction\n        # ATM, as used, many requests we send with boto might be just HEAD requests\n        # (if I got it right) and we would not receive BODY back with the detailed\n        # error_code.  Then we will allow to retry until we get something we know how to\n        # handle it more specifically\n        if e.error_code == 'ExpiredToken':\n            raise AccessPermissionExpiredError(\"Used token to access S3 has expired: %s\" % exc_str(e))\n        elif not e.error_code:\n            lgr.log(5, \"Empty error_code in %s\", e)\n        return True\n    return False\n\n\ndef try_multiple_dec_s3(func):\n    \"\"\"An S3 specific adapter to @try_multiple_dec\n\n    To decorate func to try multiple times after some sleep upon encountering\n    some intermittent error from S3\n    \"\"\"\n    return try_multiple_dec(\n                ntrials=4,\n                duration=2.,\n                increment_type='exponential',\n                exceptions=S3ResponseError,\n                exceptions_filter=_check_S3ResponseError,\n                logger=lgr.debug,\n    )(func)\n\n\ndef get_bucket(conn, bucket_name):\n    \"\"\"A helper to get a bucket\n\n    Parameters\n    ----------\n    bucket_name: str\n        Name of the bucket to connect to\n    \"\"\"\n    try:\n        return try_multiple_dec_s3(conn.get_bucket)(bucket_name)\n    except S3ResponseError as e:\n        # can initially deny or error to connect to the specific bucket by name,\n        # and we would need to list which buckets are available under following\n        # credentials:\n        lgr.debug(\"Cannot access bucket %s by name with validation: %s\",\n                  bucket_name, exc_str(e))\n        if conn.anon:\n            raise AnonymousAccessDeniedError(\n                \"Access to the bucket %s did not succeed.  Requesting \"\n                \"'all buckets' for anonymous S3 connection makes \"\n                \"little sense and thus not supported.\" % bucket_name,\n                supported_types=['aws-s3']\n            )\n\n        if e.reason == \"Forbidden\":\n            # Could be just HEAD call boto issues is not allowed, and we should not\n            # try to verify that bucket is \"reachable\".  Just carry on\n            try:\n                return try_multiple_dec_s3(conn.get_bucket)(bucket_name, validate=False)\n            except S3ResponseError as e2:\n                lgr.debug(\"Cannot access bucket %s even without validation: %s\",\n                          bucket_name, exc_str(e2))\n                _handle_exception(e, bucket_name)\n\n        try:\n            all_buckets = try_multiple_dec_s3(conn.get_all_buckets)()\n            all_bucket_names = [b.name for b in all_buckets]\n            lgr.debug(\"Found following buckets %s\", ', '.join(all_bucket_names))\n            if bucket_name in all_bucket_names:\n                return all_buckets[all_bucket_names.index(bucket_name)]\n        except S3ResponseError as e2:\n            lgr.debug(\"Cannot access all buckets: %s\", exc_str(e2))\n            _handle_exception(e, 'any (originally requested %s)' % bucket_name)\n        else:\n            _handle_exception(e, bucket_name)\n\n\nclass VersionedFilesPool(object):\n    \"\"\"Just a helper which would help to create versioned files in the bucket\"\"\"\n    def __init__(self, bucket):\n        self._versions = {}\n        self._bucket = bucket\n\n    @property\n    def bucket(self):\n        return self._bucket\n\n    def __call__(self, filename, prefix='', load=None):\n        self._versions[filename] = version = self._versions.get(filename, 0) + 1\n        version_str = \"version%d\" % version\n        # if we are to upload fresh content\n        k = Key(self._bucket)\n        k.key = filename\n        #k.set_contents_from_filename('/home/yoh/.emacs')\n        base, ext = splitext(filename)\n        #content_type = None\n        mtype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'\n        headers = {'Content-Type': mtype}\n\n        if load is None:\n            load = prefix\n            if ext == 'html':\n                load += '<html><body>%s</body></html>' % version_str\n            else:\n                load += version_str\n\n        k.set_contents_from_string(load, headers=headers)\n        return k\n\n    def reset_version(self, filename):\n        self._versions[filename] = 0\n\n\ndef get_key_url(e, schema='http', versioned=True):\n    \"\"\"Generate an s3:// or http:// url given a key\n\n    if versioned url is requested but version_id is None, no versionId suffix\n    will be added\n    \"\"\"\n    # TODO: here we would need to encode the name since urlquote actually\n    # can't do that on its own... but then we should get a copy of the thing\n    # so we could still do the .format....\n    # ... = e.name.encode('utf-8')  # unicode isn't advised in URLs\n    e.name_urlquoted = urlquote(e.name)\n    if schema == 'http':\n        fmt = \"http://{e.bucket.name}.s3.amazonaws.com/{e.name_urlquoted}\"\n    elif schema == 's3':\n        fmt = \"s3://{e.bucket.name}/{e.name_urlquoted}\"\n    else:\n        raise ValueError(schema)\n    if versioned and e.version_id is not None:\n        fmt += \"?versionId={e.version_id}\"\n    return fmt.format(e=e)\n\n\ndef prune_and_delete_bucket(bucket):\n    \"\"\"Deletes all the content and then deletes bucket\n\n    Should be used with care -- no confirmation requested\n    \"\"\"\n    bucket.delete_keys(bucket.list_versions(''))\n    # this one doesn't work since it generates DeleteMarkers instead ;)\n    #for key in b.list_versions(''):\n    #    b.delete_key(key)\n    bucket.delete()\n    lgr.info(\"Bucket %s was removed\" % bucket.name)\n\n\ndef set_bucket_public_access_policy(bucket):\n    # we need to enable permissions for making content available\n    bucket.set_policy(\"\"\"{\n      \"Version\":\"2012-10-17\",\n      \"Statement\":[{\n          \"Sid\":\"AddPerm\",\n          \"Effect\":\"Allow\",\n          \"Principal\": \"*\",\n          \"Action\":[\"s3:GetObject\", \"s3:GetObjectVersion\", \"s3:GetObjectTorrent\", \"s3:GetObjectVersionTorrent\"],\n          \"Resource\":[\"arn:aws:s3:::%s/*\"]\n        }\n      ]\n    }\"\"\" % bucket.name)\n\n\ndef gen_test_bucket(bucket_name):\n    conn = _get_bucket_connection(S3_ADMIN_CREDENTIAL)\n    # assure we have none\n    try:\n        bucket = conn.get_bucket(bucket_name)\n        lgr.info(\"Deleting existing bucket %s\" % bucket.name)\n        prune_and_delete_bucket(bucket)\n    except:  # MIH: MemoryError?\n        # so nothing to worry about\n        pass\n    finally:\n        pass\n\n    return conn.create_bucket(bucket_name)\n\n\ndef _gen_bucket_test0(bucket_name=\"datalad-test0\", versioned=True):\n\n    bucket = gen_test_bucket(bucket_name)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    files(\"1version-nonversioned1.txt\")\n    files(\"2versions-nonversioned1.txt\")\n\n    if versioned:\n        # make bucket versioned AFTER we uploaded one file already\n        bucket.configure_versioning(True)\n\n    files(\"2versions-nonversioned1.txt\")\n    files(\"2versions-nonversioned1.txt_sameprefix\")\n    for v in range(3):\n        files(\"3versions-allversioned.txt\")\n    files(\"3versions-allversioned.txt_sameprefix\")  # to test possible problems\n\n    # File which was created and then removed\n    bucket.delete_key(files(\"1version-removed.txt\"))\n\n    # File which was created/removed/recreated (with new content)\n    bucket.delete_key(files(\"2versions-removed-recreated.txt\"))\n    files(\"2versions-removed-recreated.txt\")\n    files(\"2versions-removed-recreated.txt_sameprefix\")\n\n    # File which was created/removed/recreated (with new content)\n    f = \"1version-removed-recreated.txt\"\n    bucket.delete_key(files(f))\n    files.reset_version(f)\n    files(f)\n    lgr.info(\"Bucket %s was generated and populated\" % bucket_name)\n\n    return bucket\n\n\ndef gen_bucket_test0_versioned():\n    return _gen_bucket_test0('datalad-test0-versioned', versioned=True)\n\n\ndef gen_bucket_test0_nonversioned():\n    return _gen_bucket_test0('datalad-test0-nonversioned', versioned=False)\n\n\ndef gen_bucket_test1_dirs():\n    bucket_name = 'datalad-test1-dirs-versioned'\n    bucket = gen_test_bucket(bucket_name)\n    bucket.configure_versioning(True)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    files(\"d1\", load=\"\")  # creating an empty file\n    # then we would like to remove that d1 as a file and make a directory out of it\n    files(\"d1/file1.txt\")\n    # and then delete it and place it back\n    files(\"d1\", load=\"smth\")\n\n\ndef gen_bucket_test2_obscurenames_versioned():\n    # in principle bucket name could also contain ., but boto doesn't digest it\n    # well\n    bucket_name = 'datalad-test2-obscurenames-versioned'\n    bucket = gen_test_bucket(bucket_name)\n    bucket.configure_versioning(True)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    # http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html\n    files(\"f 1\", load=\"\")\n    files(\"f [1][2]\")\n    # Need to grow up for this .... TODO\n    #files(u\"\u044e\u043d\u0438\u043a\u043e\u0434\")\n    #files(u\"\u044e\u043d\u0438/\u043a\u043e\u0434\")\n    # all fancy ones at once\n    files(\"f!-_.*'( )\")\n    # the super-fancy which aren't guaranteed to be good idea (as well as [] above)\n    files(\"f &$=@:+,?;\")\n\n\ndef gen_bucket_test1_manydirs():\n    # to test crawling with flexible subdatasets making decisions\n    bucket_name = 'datalad-test1-manydirs-versioned'\n    bucket = gen_test_bucket(bucket_name)\n    bucket.configure_versioning(True)\n\n    # Enable web access to that bucket to everyone\n    bucket.configure_website('index.html')\n    set_bucket_public_access_policy(bucket)\n\n    files = VersionedFilesPool(bucket)\n\n    files(\"d1\", load=\"\")  # creating an empty file\n    # then we would like to remove that d1 as a file and make a directory out of it\n    files(\"d1/file1.txt\")\n    files(\"d1/sd1/file1.txt\")\n    files(\"d1/sd2/file3.txt\", load=\"a\")\n    files(\"d1/sd2/ssd1/file4.txt\")\n    files(\"d2/file1.txt\")\n    files(\"d2/sd1/file1.txt\")\n    files(\"d2/sd1/ssd/sssd/file1.txt\")\n\n\ndef add_version_to_url(url, version, replace=False):\n    \"\"\"Add a version ID to `url`.\n\n    Parameters\n    ----------\n    url : datalad.support.network.URL\n        A URL.\n    version : str\n        The value of 'versionId='.\n    replace : boolean, optional\n        If a versionID is already present in `url`, replace it.\n\n    Returns\n    -------\n    A versioned URL (str)\n    \"\"\"\n    version_id = \"versionId={}\".format(version)\n    if not url.query:\n        query = version_id\n    else:\n        ver_match = re.match(\"(?P<pre>.*&)?\"\n                             \"(?P<vers>versionId=[^&]+)\"\n                             \"(?P<post>&.*)?\",\n                             url.query)\n        if ver_match:\n            if replace:\n                query = \"\".join([ver_match.group(\"pre\") or \"\",\n                                 version_id,\n                                 ver_match.group(\"post\") or \"\"])\n            else:\n                query = url.query\n        else:\n            query = url.query + \"&\" + version_id\n    return URL(**dict(url.fields, query=query)).as_str()\n\n\ndef get_versioned_url(url, guarantee_versioned=False, return_all=False, verify=False,\n                      s3conn=None, update=False):\n    \"\"\"Given a url return a versioned URL\n\n    Originally targeting AWS S3 buckets with versioning enabled\n\n    Parameters\n    ----------\n    url : string\n    guarantee_versioned : bool, optional\n      Would fail if buckets is determined to have no versioning enabled.\n      It will not fail if we fail to determine if bucket is versioned or\n      not\n    return_all: bool, optional\n      If True, would return a list with URLs for all the versions of this\n      file, sorted chronologically with latest first (when possible, e.g.\n      for S3).  Remove markers get ignored\n    verify: bool, optional\n      Verify that URL is accessible. As discovered some versioned keys might\n      be denied access to\n    update : bool, optional\n      If the URL already contains a version ID, update it to the latest version\n      ID.  This option has no effect if return_all is true.\n\n    Returns\n    -------\n    string or list of string\n    \"\"\"\n    url_rec = URL(url)\n\n    s3_bucket, fpath = None, url_rec.path.lstrip('/')\n\n    was_versioned = False\n    all_versions = []\n\n    if url_rec.hostname.endswith('.s3.amazonaws.com'):\n        if url_rec.scheme not in ('http', 'https'):\n            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)\n        # we know how to slice this cat\n        s3_bucket = url_rec.hostname.split('.', 1)[0]\n    elif url_rec.hostname == 's3.amazonaws.com':\n        if url_rec.scheme not in ('http', 'https'):\n            raise ValueError(\"Do not know how to handle %s scheme\" % url_rec.scheme)\n        # url is s3.amazonaws.com/bucket/PATH\n        s3_bucket, fpath = fpath.split('/', 1)\n    elif url_rec.scheme == 's3':\n        s3_bucket = url_rec.hostname  # must be\n        if url_rec.query and 'versionId=' in url_rec.query:\n            was_versioned = True\n            all_versions.append(url)\n        else:\n            # and for now implement magical conversion to URL\n            # TODO: wouldn't work if needs special permissions etc\n            # actually for now\n            raise NotImplementedError\n\n    if s3_bucket:\n        # TODO: cache\n        if s3conn is None:\n            # we need to reuse our providers\n            from ..downloaders.providers import Providers\n            providers = Providers.from_config_files()\n            s3url = \"s3://%s/\" % s3_bucket\n            s3provider = providers.get_provider(s3url)\n            if s3provider.authenticator.bucket is not None and s3provider.authenticator.bucket.name == s3_bucket:\n                # we have established connection before, so let's just reuse\n                bucket = s3provider.authenticator.bucket\n            else:\n                bucket = s3provider.authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)\n        else:\n            bucket = s3conn.get_bucket(s3_bucket)\n\n        supports_versioning = True  # assume that it does\n        try:\n            supports_versioning = bucket.get_versioning_status()  # TODO cache\n        except S3ResponseError as e:\n            # might be forbidden, i.e. \"403 Forbidden\" so we try then anyways\n            supports_versioning = 'maybe'\n\n        if supports_versioning:\n            all_keys = bucket.list_versions(fpath)\n            # Filter and sort them so the newest one on top\n            all_keys = [x for x in sorted(all_keys, key=lambda x: (x.last_modified, x.is_latest))\n                        if ((x.name == fpath)  # match exact name, not just prefix\n                            )\n                        ][::-1]\n            # our current assumptions\n            assert(all_keys[0].is_latest)\n            # and now filter out delete markers etc\n            all_keys = [x for x in all_keys if isinstance(x, Key)]  # ignore DeleteMarkers\n            assert(all_keys)\n\n            for key in all_keys:\n                url_versioned = add_version_to_url(\n                    url_rec, key.version_id, replace=update and not return_all)\n\n                all_versions.append(url_versioned)\n                if verify:\n                    # it would throw HTTPError exception if not accessible\n                    _ = urlopen(Request(url_versioned))\n                was_versioned = True\n                if not return_all:\n                    break\n\n    if guarantee_versioned and not was_versioned:\n        raise RuntimeError(\"Could not version %s\" % url)\n\n    if not all_versions:\n        # we didn't get a chance\n        all_versions = [url_rec.as_str()]\n\n    if return_all:\n        return all_versions\n    else:\n        return all_versions[0]\n\n\nif __name__ == '__main__':\n    import sys\n    lgr.setLevel(logging.INFO)\n    # TODO: proper cmdline\n    if len(sys.argv) > 1 and sys.argv[1] == \"generate\":\n        if len(sys.argv) < 3:\n            raise ValueError(\"Say 'all' to regenerate all, or give a generators name\")\n        name = sys.argv[2]\n        if name.lower() == 'all':\n            for f in locals().keys():\n                if f.startswith('gen_bucket_'):\n                    locals()[f]()\n        else:\n            locals()['gen_bucket_%s' % name]()\n    else:\n        print(\"nothing todo\")\n"}
A user will ask you to solve a task. You should first draft your thinking process (inner monologue). Then, generate the solution.

Your response format must follow the template below:
<think>
Your thoughts or/and draft, like working through an exercise on scratch paper. Be as casual and as long as you want until you are confident to generate a correct solution.
</think>
<solution>
Final solution presented to the user.
</solution>
system
We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
[ISSUE]
**Title:** Authentication Error When Accessing S3 Buckets Containing '.' Using Anonymous Access

**Description:**
When attempting to retrieve a versioned URL for an S3 bucket that includes a dot (`.`) in its name without providing authentication credentials, the `get_versioned_url` function fails unexpectedly.

**Example Buggy Code:**
```python
from datalad.support.s3 import get_versioned_url

url = "http://openneuro.org.s3.amazonaws.com/ds000001/dataset_description.json"
versioned_url = get_versioned_url(url)
print(versioned_url)
```
*This code is intended to append a `versionId` query parameter to the provided S3 URL without requiring authentication.*

**Expected Behavior:**
The function should successfully return the versioned URL with the `?versionId=` appended, enabling access without the need for authentication when no provider is specified.

**Actual Behavior:**
The function raises a `RuntimeError` indicating that authentication is required:
```
RuntimeError: A non-interactive silent UI was asked for a response to a question: key_id. Title: You need to authenticate with 'datalad-test-s3' credentials. team@datalad.org provides information on how to gain access. Additional arguments: hidden=False
```
*This error occurs because the function does not handle S3 bucket names containing dots when no authentication provider is supplied.*

[/ISSUE]
--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.

--- BEGIN FILE ---
```
### datalad/support/s3.py
# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8  -*-
# vi: set ft=python sts=4 ts=4 sw=4 et:
### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##
#
#   See COPYING file distributed along with the datalad package for the
#   copyright and license terms.
#
### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##g
"""Variety of helpers to deal with AWS S3

Use as a script to generate test buckets via e.g.

    python -m datalad.support.s3 generate test1_dirs
"""

__docformat__ = 'restructuredtext'

import mimetypes

from os.path import splitext
import re

from datalad.support.network import urlquote, URL

import logging
import datalad.log  # Just to have lgr setup happen this one used a script
lgr = logging.getLogger('datalad.s3')

from datalad.dochelpers import exc_str
from datalad.support.exceptions import (
    DownloadError,
    AccessDeniedError,
    AccessPermissionExpiredError,
    AnonymousAccessDeniedError,
)
from datalad.utils import try_multiple_dec

from urllib.request import urlopen, Request


try:
    import boto
    from boto.s3.key import Key
    from boto.exception import S3ResponseError
    from boto.s3.connection import OrdinaryCallingFormat
except Exception as e:
    if not isinstance(e, ImportError):
        lgr.warning("boto module failed to import although available: %s" % exc_str(e))
    boto = Key = S3ResponseError = OrdinaryCallingFormat = None


# TODO: should become a config option and managed along with the rest
S3_ADMIN_CREDENTIAL = "datalad-datalad-admin-s3"
S3_TEST_CREDENTIAL = "datalad-datalad-test-s3"


def _get_bucket_connection(credential):
    # eventually we should be able to have multiple credentials associated
    # with different resources. Thus for now just making an option which
    # one to use
    # do full shebang with entering credentials
    from datalad.downloaders.credentials import AWS_S3
    credential = AWS_S3(credential, None)
    if not credential.is_known:
        credential.enter_new()
    creds = credential()
    return boto.connect_s3(creds["key_id"], creds["secret_id"])


def _handle_exception(e, bucket_name):
    """Helper to handle S3 connection exception"""
    raise (
        AccessDeniedError
        if e.error_code == 'AccessDenied'
        else DownloadError)(
            "Cannot connect to %s S3 bucket. Exception: %s"
            % (bucket_name, exc_str(e))
        )


def _check_S3ResponseError(e):
    """Returns True if should be retried.

    raises ... if token has expired"""
    # https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html#ErrorCodeList
    if e.status in (
                    307,  # MovedTemporarily -- DNS updates etc
                    503,  # Slow down -- too many requests, so perfect fit to sleep a bit
                    ):
        return True
    if e.status == 400:
        # Generic Bad Request -- could be many things! generally -- we retry, but
        # some times provide more directed reaction
        # ATM, as used, many requests we send with boto might be just HEAD requests
        # (if I got it right) and we would not receive BODY back with the detailed
        # error_code.  Then we will allow to retry until we get something we know how to
        # handle it more specifically
        if e.error_code == 'ExpiredToken':
            raise AccessPermissionExpiredError("Used token to access S3 has expired: %s" % exc_str(e))
        elif not e.error_code:
            lgr.log(5, "Empty error_code in %s", e)
        return True
    return False


def try_multiple_dec_s3(func):
    """An S3 specific adapter to @try_multiple_dec

    To decorate func to try multiple times after some sleep upon encountering
    some intermittent error from S3
    """
    return try_multiple_dec(
                ntrials=4,
                duration=2.,
                increment_type='exponential',
                exceptions=S3ResponseError,
                exceptions_filter=_check_S3ResponseError,
                logger=lgr.debug,
    )(func)


def get_bucket(conn, bucket_name):
    """A helper to get a bucket

    Parameters
    ----------
    bucket_name: str
        Name of the bucket to connect to
    """
    try:
        return try_multiple_dec_s3(conn.get_bucket)(bucket_name)
    except S3ResponseError as e:
        # can initially deny or error to connect to the specific bucket by name,
        # and we would need to list which buckets are available under following
        # credentials:
        lgr.debug("Cannot access bucket %s by name with validation: %s",
                  bucket_name, exc_str(e))
        if conn.anon:
            raise AnonymousAccessDeniedError(
                "Access to the bucket %s did not succeed.  Requesting "
                "'all buckets' for anonymous S3 connection makes "
                "little sense and thus not supported." % bucket_name,
                supported_types=['aws-s3']
            )

        if e.reason == "Forbidden":
            # Could be just HEAD call boto issues is not allowed, and we should not
            # try to verify that bucket is "reachable".  Just carry on
            try:
                return try_multiple_dec_s3(conn.get_bucket)(bucket_name, validate=False)
            except S3ResponseError as e2:
                lgr.debug("Cannot access bucket %s even without validation: %s",
                          bucket_name, exc_str(e2))
                _handle_exception(e, bucket_name)

        try:
            all_buckets = try_multiple_dec_s3(conn.get_all_buckets)()
            all_bucket_names = [b.name for b in all_buckets]
            lgr.debug("Found following buckets %s", ', '.join(all_bucket_names))
            if bucket_name in all_bucket_names:
                return all_buckets[all_bucket_names.index(bucket_name)]
        except S3ResponseError as e2:
            lgr.debug("Cannot access all buckets: %s", exc_str(e2))
            _handle_exception(e, 'any (originally requested %s)' % bucket_name)
        else:
            _handle_exception(e, bucket_name)


class VersionedFilesPool(object):
    """Just a helper which would help to create versioned files in the bucket"""
    def __init__(self, bucket):
        self._versions = {}
        self._bucket = bucket

    @property
    def bucket(self):
        return self._bucket

    def __call__(self, filename, prefix='', load=None):
        self._versions[filename] = version = self._versions.get(filename, 0) + 1
        version_str = "version%d" % version
        # if we are to upload fresh content
        k = Key(self._bucket)
        k.key = filename
        #k.set_contents_from_filename('/home/yoh/.emacs')
        base, ext = splitext(filename)
        #content_type = None
        mtype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'
        headers = {'Content-Type': mtype}

        if load is None:
            load = prefix
            if ext == 'html':
                load += '<html><body>%s</body></html>' % version_str
            else:
                load += version_str

        k.set_contents_from_string(load, headers=headers)
        return k

    def reset_version(self, filename):
        self._versions[filename] = 0


def get_key_url(e, schema='http', versioned=True):
    """Generate an s3:// or http:// url given a key

    if versioned url is requested but version_id is None, no versionId suffix
    will be added
    """
    # TODO: here we would need to encode the name since urlquote actually
    # can't do that on its own... but then we should get a copy of the thing
    # so we could still do the .format....
    # ... = e.name.encode('utf-8')  # unicode isn't advised in URLs
    e.name_urlquoted = urlquote(e.name)
    if schema == 'http':
        fmt = "http://{e.bucket.name}.s3.amazonaws.com/{e.name_urlquoted}"
    elif schema == 's3':
        fmt = "s3://{e.bucket.name}/{e.name_urlquoted}"
    else:
        raise ValueError(schema)
    if versioned and e.version_id is not None:
        fmt += "?versionId={e.version_id}"
    return fmt.format(e=e)


def prune_and_delete_bucket(bucket):
    """Deletes all the content and then deletes bucket

    Should be used with care -- no confirmation requested
    """
    bucket.delete_keys(bucket.list_versions(''))
    # this one doesn't work since it generates DeleteMarkers instead ;)
    #for key in b.list_versions(''):
    #    b.delete_key(key)
    bucket.delete()
    lgr.info("Bucket %s was removed" % bucket.name)


def set_bucket_public_access_policy(bucket):
    # we need to enable permissions for making content available
    bucket.set_policy("""{
      "Version":"2012-10-17",
      "Statement":[{
          "Sid":"AddPerm",
          "Effect":"Allow",
          "Principal": "*",
          "Action":["s3:GetObject", "s3:GetObjectVersion", "s3:GetObjectTorrent", "s3:GetObjectVersionTorrent"],
          "Resource":["arn:aws:s3:::%s/*"]
        }
      ]
    }""" % bucket.name)


def gen_test_bucket(bucket_name):
    conn = _get_bucket_connection(S3_ADMIN_CREDENTIAL)
    # assure we have none
    try:
        bucket = conn.get_bucket(bucket_name)
        lgr.info("Deleting existing bucket %s" % bucket.name)
        prune_and_delete_bucket(bucket)
    except:  # MIH: MemoryError?
        # so nothing to worry about
        pass
    finally:
        pass

    return conn.create_bucket(bucket_name)


def _gen_bucket_test0(bucket_name="datalad-test0", versioned=True):

    bucket = gen_test_bucket(bucket_name)

    # Enable web access to that bucket to everyone
    bucket.configure_website('index.html')
    set_bucket_public_access_policy(bucket)

    files = VersionedFilesPool(bucket)

    files("1version-nonversioned1.txt")
    files("2versions-nonversioned1.txt")

    if versioned:
        # make bucket versioned AFTER we uploaded one file already
        bucket.configure_versioning(True)

    files("2versions-nonversioned1.txt")
    files("2versions-nonversioned1.txt_sameprefix")
    for v in range(3):
        files("3versions-allversioned.txt")
    files("3versions-allversioned.txt_sameprefix")  # to test possible problems

    # File which was created and then removed
    bucket.delete_key(files("1version-removed.txt"))

    # File which was created/removed/recreated (with new content)
    bucket.delete_key(files("2versions-removed-recreated.txt"))
    files("2versions-removed-recreated.txt")
    files("2versions-removed-recreated.txt_sameprefix")

    # File which was created/removed/recreated (with new content)
    f = "1version-removed-recreated.txt"
    bucket.delete_key(files(f))
    files.reset_version(f)
    files(f)
    lgr.info("Bucket %s was generated and populated" % bucket_name)

    return bucket


def gen_bucket_test0_versioned():
    return _gen_bucket_test0('datalad-test0-versioned', versioned=True)


def gen_bucket_test0_nonversioned():
    return _gen_bucket_test0('datalad-test0-nonversioned', versioned=False)


def gen_bucket_test1_dirs():
    bucket_name = 'datalad-test1-dirs-versioned'
    bucket = gen_test_bucket(bucket_name)
    bucket.configure_versioning(True)

    # Enable web access to that bucket to everyone
    bucket.configure_website('index.html')
    set_bucket_public_access_policy(bucket)

    files = VersionedFilesPool(bucket)

    files("d1", load="")  # creating an empty file
    # then we would like to remove that d1 as a file and make a directory out of it
    files("d1/file1.txt")
    # and then delete it and place it back
    files("d1", load="smth")


def gen_bucket_test2_obscurenames_versioned():
    # in principle bucket name could also contain ., but boto doesn't digest it
    # well
    bucket_name = 'datalad-test2-obscurenames-versioned'
    bucket = gen_test_bucket(bucket_name)
    bucket.configure_versioning(True)

    # Enable web access to that bucket to everyone
    bucket.configure_website('index.html')
    set_bucket_public_access_policy(bucket)

    files = VersionedFilesPool(bucket)

    # http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
    files("f 1", load="")
    files("f [1][2]")
    # Need to grow up for this .... TODO
    #files(u"юникод")
    #files(u"юни/код")
    # all fancy ones at once
    files("f!-_.*'( )")
    # the super-fancy which aren't guaranteed to be good idea (as well as [] above)
    files("f &$=@:+,?;")


def gen_bucket_test1_manydirs():
    # to test crawling with flexible subdatasets making decisions
    bucket_name = 'datalad-test1-manydirs-versioned'
    bucket = gen_test_bucket(bucket_name)
    bucket.configure_versioning(True)

    # Enable web access to that bucket to everyone
    bucket.configure_website('index.html')
    set_bucket_public_access_policy(bucket)

    files = VersionedFilesPool(bucket)

    files("d1", load="")  # creating an empty file
    # then we would like to remove that d1 as a file and make a directory out of it
    files("d1/file1.txt")
    files("d1/sd1/file1.txt")
    files("d1/sd2/file3.txt", load="a")
    files("d1/sd2/ssd1/file4.txt")
    files("d2/file1.txt")
    files("d2/sd1/file1.txt")
    files("d2/sd1/ssd/sssd/file1.txt")


def add_version_to_url(url, version, replace=False):
    """Add a version ID to `url`.

    Parameters
    ----------
    url : datalad.support.network.URL
        A URL.
    version : str
        The value of 'versionId='.
    replace : boolean, optional
        If a versionID is already present in `url`, replace it.

    Returns
    -------
    A versioned URL (str)
    """
    version_id = "versionId={}".format(version)
    if not url.query:
        query = version_id
    else:
        ver_match = re.match("(?P<pre>.*&)?"
                             "(?P<vers>versionId=[^&]+)"
                             "(?P<post>&.*)?",
                             url.query)
        if ver_match:
            if replace:
                query = "".join([ver_match.group("pre") or "",
                                 version_id,
                                 ver_match.group("post") or ""])
            else:
                query = url.query
        else:
            query = url.query + "&" + version_id
    return URL(**dict(url.fields, query=query)).as_str()


def get_versioned_url(url, guarantee_versioned=False, return_all=False, verify=False,
                      s3conn=None, update=False):
    """Given a url return a versioned URL

    Originally targeting AWS S3 buckets with versioning enabled

    Parameters
    ----------
    url : string
    guarantee_versioned : bool, optional
      Would fail if buckets is determined to have no versioning enabled.
      It will not fail if we fail to determine if bucket is versioned or
      not
    return_all: bool, optional
      If True, would return a list with URLs for all the versions of this
      file, sorted chronologically with latest first (when possible, e.g.
      for S3).  Remove markers get ignored
    verify: bool, optional
      Verify that URL is accessible. As discovered some versioned keys might
      be denied access to
    update : bool, optional
      If the URL already contains a version ID, update it to the latest version
      ID.  This option has no effect if return_all is true.

    Returns
    -------
    string or list of string
    """
    url_rec = URL(url)

    s3_bucket, fpath = None, url_rec.path.lstrip('/')

    was_versioned = False
    all_versions = []

    if url_rec.hostname.endswith('.s3.amazonaws.com'):
        if url_rec.scheme not in ('http', 'https'):
            raise ValueError("Do not know how to handle %s scheme" % url_rec.scheme)
        # we know how to slice this cat
        s3_bucket = url_rec.hostname.split('.', 1)[0]
    elif url_rec.hostname == 's3.amazonaws.com':
        if url_rec.scheme not in ('http', 'https'):
            raise ValueError("Do not know how to handle %s scheme" % url_rec.scheme)
        # url is s3.amazonaws.com/bucket/PATH
        s3_bucket, fpath = fpath.split('/', 1)
    elif url_rec.scheme == 's3':
        s3_bucket = url_rec.hostname  # must be
        if url_rec.query and 'versionId=' in url_rec.query:
            was_versioned = True
            all_versions.append(url)
        else:
            # and for now implement magical conversion to URL
            # TODO: wouldn't work if needs special permissions etc
            # actually for now
            raise NotImplementedError

    if s3_bucket:
        # TODO: cache
        if s3conn is None:
            # we need to reuse our providers
            from ..downloaders.providers import Providers
            providers = Providers.from_config_files()
            s3url = "s3://%s/" % s3_bucket
            s3provider = providers.get_provider(s3url)
            if s3provider.authenticator.bucket is not None and s3provider.authenticator.bucket.name == s3_bucket:
                # we have established connection before, so let's just reuse
                bucket = s3provider.authenticator.bucket
            else:
                bucket = s3provider.authenticator.authenticate(s3_bucket, s3provider.credential)  # s3conn or _get_bucket_connection(S3_TEST_CREDENTIAL)
        else:
            bucket = s3conn.get_bucket(s3_bucket)

        supports_versioning = True  # assume that it does
        try:
            supports_versioning = bucket.get_versioning_status()  # TODO cache
        except S3ResponseError as e:
            # might be forbidden, i.e. "403 Forbidden" so we try then anyways
            supports_versioning = 'maybe'

        if supports_versioning:
            all_keys = bucket.list_versions(fpath)
            # Filter and sort them so the newest one on top
            all_keys = [x for x in sorted(all_keys, key=lambda x: (x.last_modified, x.is_latest))
                        if ((x.name == fpath)  # match exact name, not just prefix
                            )
                        ][::-1]
            # our current assumptions
            assert(all_keys[0].is_latest)
            # and now filter out delete markers etc
            all_keys = [x for x in all_keys if isinstance(x, Key)]  # ignore DeleteMarkers
            assert(all_keys)

            for key in all_keys:
                url_versioned = add_version_to_url(
                    url_rec, key.version_id, replace=update and not return_all)

                all_versions.append(url_versioned)
                if verify:
                    # it would throw HTTPError exception if not accessible
                    _ = urlopen(Request(url_versioned))
                was_versioned = True
                if not return_all:
                    break

    if guarantee_versioned and not was_versioned:
        raise RuntimeError("Could not version %s" % url)

    if not all_versions:
        # we didn't get a chance
        all_versions = [url_rec.as_str()]

    if return_all:
        return all_versions
    else:
        return all_versions[0]


if __name__ == '__main__':
    import sys
    lgr.setLevel(logging.INFO)
    # TODO: proper cmdline
    if len(sys.argv) > 1 and sys.argv[1] == "generate":
        if len(sys.argv) < 3:
            raise ValueError("Say 'all' to regenerate all, or give a generators name")
        name = sys.argv[2]
        if name.lower() == 'all':
            for f in locals().keys():
                if f.startswith('gen_bucket_'):
                    locals()[f]()
        else:
            locals()['gen_bucket_%s' % name]()
    else:
        print("nothing todo")

```
--- END FILE ---

Please first localize the bug based on the issue statement, and then generate *SEARCH/REPLACE* edits to fix the issue.

Every *SEARCH/REPLACE* edit must use this format:
1. The file path
2. The start of search block: <<<<<<< SEARCH
3. A contiguous chunk of lines to search for in the existing source code
4. The dividing line: =======
5. The lines to replace into the source code
6. The end of the replace block: >>>>>>> REPLACE

Here is an example:

```python
### mathweb/flask/app.py
<<<<<<< SEARCH
from flask import Flask
=======
import math
from flask import Flask
>>>>>>> REPLACE
```
</solution>

Please note that the *SEARCH/REPLACE* edit REQUIRES PROPER INDENTATION. If you would like to add the line '        print(x)', you must fully write that out, with all those spaces before the code!
Wrap each *SEARCH/REPLACE* edit in a code block as shown in the example above. If you have multiple *SEARCH/REPLACE* edits, use a separate code block for each one.
user