{
    "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": "dcad257988817412ba512e7455d2b304c583fcb8^",
    "new_commit_hash": "dcad257988817412ba512e7455d2b304c583fcb8",
    "commit_message": "Merge pull request #4985 from yarikoptic/bf-s3verurl\n\nBF: get_versioned_url - support anonymous acces (no provider) and buckets with . in name",
    "commit_date": "2020-10-05T18:47:24-04:00",
    "metadata": {}
}
{
    "repo_name": "datalad",
    "new_commit_hash": "dcad257988817412ba512e7455d2b304c583fcb8",
    "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.dev144\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 160ms\nInstalled 25 packages in 2.91s\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 4.12s\nPrepared 1 package in 3.08s\nInstalled 57 packages in 253ms\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_dcad257988817412ba512e7455d2b304c583fcb8)\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==11.1.0\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 158ms\nInstalled 32 packages in 726ms\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_dcad257988817412ba512e7455d2b304c583fcb8\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 2.59s =========================\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_dcad257988817412ba512e7455d2b304c583fcb8\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:** `get_versioned_url` fails for S3 URLs with dots in bucket names or when using anonymous access

**Description:**
When attempting to obtain a versioned URL for an S3 bucket that contains dots in its name or when no authentication provider is specified, the `get_versioned_url` function crashes unexpectedly.

**Example Code:**
```python
url = "http://openneuro.org.s3.amazonaws.com/ds000001/dataset_description.json"
versioned_url = get_versioned_url(url)
```

**Expected Behavior:**
The `get_versioned_url` function should correctly handle bucket names with dots and support anonymous access without requiring authentication. It should return a valid versioned URL without raising errors.

**Actual Behavior:**
The function raises a `RuntimeError` stating that authentication is required, even when accessing the bucket anonymously. This occurs because the bucket name is incorrectly parsed due to the presence of dots, leading the function to mistakenly attempt authentication.

[/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:** `get_versioned_url` fails for S3 URLs with dots in bucket names or when using anonymous access

**Description:**
When attempting to obtain a versioned URL for an S3 bucket that contains dots in its name or when no authentication provider is specified, the `get_versioned_url` function crashes unexpectedly.

**Example Code:**
```python
url = "http://openneuro.org.s3.amazonaws.com/ds000001/dataset_description.json"
versioned_url = get_versioned_url(url)
```

**Expected Behavior:**
The `get_versioned_url` function should correctly handle bucket names with dots and support anonymous access without requiring authentication. It should return a valid versioned URL without raising errors.

**Actual Behavior:**
The function raises a `RuntimeError` stating that authentication is required, even when accessing the bucket anonymously. This occurs because the bucket name is incorrectly parsed due to the presence of dots, leading the function to mistakenly attempt authentication.

[/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:** `get_versioned_url` fails for S3 URLs with dots in bucket names or when using anonymous access

**Description:**
When attempting to obtain a versioned URL for an S3 bucket that contains dots in its name or when no authentication provider is specified, the `get_versioned_url` function crashes unexpectedly.

**Example Code:**
```python
url = "http://openneuro.org.s3.amazonaws.com/ds000001/dataset_description.json"
versioned_url = get_versioned_url(url)
```

**Expected Behavior:**
The `get_versioned_url` function should correctly handle bucket names with dots and support anonymous access without requiring authentication. It should return a valid versioned URL without raising errors.

**Actual Behavior:**
The function raises a `RuntimeError` stating that authentication is required, even when accessing the bucket anonymously. This occurs because the bucket name is incorrectly parsed due to the presence of dots, leading the function to mistakenly attempt authentication.

[/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