We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Allow POST on buckets using the id_generator or the id provided in the data.


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `kinto/views/buckets.py`
Content:
```
1 from six import text_type
2 from uuid import UUID
3 
4 from pyramid.httpexceptions import (HTTPForbidden, HTTPPreconditionFailed,
5                                     HTTPException)
6 from pyramid.security import NO_PERMISSION_REQUIRED
7 from pyramid.view import view_config
8 
9 from cliquet import resource
10 from cliquet.utils import hmac_digest, build_request, reapply_cors
11 
12 from kinto.views import NameGenerator
13 
14 
15 def create_bucket(request, bucket_id):
16     """Create a bucket if it doesn't exists."""
17     bucket_put = (request.method.lower() == 'put' and
18                   request.path.endswith('buckets/default'))
19 
20     if not bucket_put:
21         subrequest = build_request(request, {
22             'method': 'PUT',
23             'path': '/buckets/%s' % bucket_id,
24             'body': {"data": {}},
25             'headers': {'If-None-Match': '*'.encode('utf-8')}
26         })
27 
28         try:
29             request.invoke_subrequest(subrequest)
30         except HTTPPreconditionFailed:
31             # The bucket already exists
32             pass
33 
34 
35 def create_collection(request, bucket_id):
36     subpath = request.matchdict.get('subpath')
37     if subpath and subpath.startswith('collections/'):
38         collection_id = subpath.split('/')[1]
39         collection_put = (request.method.lower() == 'put' and
40                           request.path.endswith(collection_id))
41         if not collection_put:
42             subrequest = build_request(request, {
43                 'method': 'PUT',
44                 'path': '/buckets/%s/collections/%s' % (
45                     bucket_id, collection_id),
46                 'body': {"data": {}},
47                 'headers': {'If-None-Match': '*'.encode('utf-8')}
48             })
49             try:
50                 request.invoke_subrequest(subrequest)
51             except HTTPPreconditionFailed:
52                 # The collection already exists
53                 pass
54 
55 
56 @view_config(route_name='default_bucket', permission=NO_PERMISSION_REQUIRED)
57 @view_config(route_name='default_bucket_collection',
58              permission=NO_PERMISSION_REQUIRED)
59 def default_bucket(request):
60     if request.method.lower() == 'options':
61         path = request.path.replace('default', 'unknown')
62         subrequest = build_request(request, {
63             'method': 'OPTIONS',
64             'path': path
65         })
66         return request.invoke_subrequest(subrequest)
67 
68     if getattr(request, 'prefixed_userid', None) is None:
69         raise HTTPForbidden  # Pass through the forbidden_view_config
70 
71     settings = request.registry.settings
72     hmac_secret = settings['cliquet.userid_hmac_secret']
73     # Build the user unguessable bucket_id UUID from its user_id
74     digest = hmac_digest(hmac_secret, request.prefixed_userid)
75     bucket_id = text_type(UUID(digest[:32]))
76     path = request.path.replace('/buckets/default', '/buckets/%s' % bucket_id)
77     querystring = request.url[(request.url.index(request.path) +
78                                len(request.path)):]
79 
80     # Make sure bucket exists
81     create_bucket(request, bucket_id)
82 
83     # Make sure the collection exists
84     create_collection(request, bucket_id)
85 
86     subrequest = build_request(request, {
87         'method': request.method,
88         'path': path + querystring,
89         'body': request.body
90     })
91 
92     try:
93         response = request.invoke_subrequest(subrequest)
94     except HTTPException as error:
95         response = reapply_cors(subrequest, error)
96     return response
97 
98 
99 @resource.register(name='bucket',
100                    collection_methods=('GET',),
101                    collection_path='/buckets',
102                    record_path='/buckets/{{id}}')
103 class Bucket(resource.ProtectedResource):
104     permissions = ('read', 'write', 'collection:create', 'group:create')
105 
106     def __init__(self, *args, **kwargs):
107         super(Bucket, self).__init__(*args, **kwargs)
108         self.collection.id_generator = NameGenerator()
109 
110     def get_parent_id(self, request):
111         # Buckets are not isolated by user, unlike Cliquet resources.
112         return ''
113 
114     def delete(self):
115         result = super(Bucket, self).delete()
116 
117         # Delete groups.
118         storage = self.collection.storage
119         parent_id = '/buckets/%s' % self.record_id
120         storage.delete_all(collection_id='group',
121                            parent_id=parent_id,
122                            with_deleted=False)
123         storage.purge_deleted(collection_id='group',
124                               parent_id=parent_id)
125 
126         # Delete collections.
127         deleted = storage.delete_all(collection_id='collection',
128                                      parent_id=parent_id,
129                                      with_deleted=False)
130         storage.purge_deleted(collection_id='collection',
131                               parent_id=parent_id)
132 
133         # Delete records.
134         id_field = self.collection.id_field
135         for collection in deleted:
136             parent_id = '/buckets/%s/collections/%s' % (self.record_id,
137                                                         collection[id_field])
138             storage.delete_all(collection_id='record',
139                                parent_id=parent_id,
140                                with_deleted=False)
141             storage.purge_deleted(collection_id='record', parent_id=parent_id)
142 
143         return result
144
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/kinto/views/buckets.py b/kinto/views/buckets.py
--- a/kinto/views/buckets.py
+++ b/kinto/views/buckets.py
@@ -97,7 +97,7 @@
 
 
 @resource.register(name='bucket',
-                   collection_methods=('GET',),
+                   collection_methods=('GET', 'POST'),
                    collection_path='/buckets',
                    record_path='/buckets/{{id}}')
 class Bucket(resource.ProtectedResource):

{"golden_diff": "diff --git a/kinto/views/buckets.py b/kinto/views/buckets.py\n--- a/kinto/views/buckets.py\n+++ b/kinto/views/buckets.py\n@@ -97,7 +97,7 @@\n \n \n @resource.register(name='bucket',\n-                   collection_methods=('GET',),\n+                   collection_methods=('GET', 'POST'),\n                    collection_path='/buckets',\n                    record_path='/buckets/{{id}}')\n class Bucket(resource.ProtectedResource):\n", "issue": "Allow POST on buckets using the id_generator or the id provided in the data.\n\n", "before_files": [{"content": "from six import text_type\nfrom uuid import UUID\n\nfrom pyramid.httpexceptions import (HTTPForbidden, HTTPPreconditionFailed,\n                                    HTTPException)\nfrom pyramid.security import NO_PERMISSION_REQUIRED\nfrom pyramid.view import view_config\n\nfrom cliquet import resource\nfrom cliquet.utils import hmac_digest, build_request, reapply_cors\n\nfrom kinto.views import NameGenerator\n\n\ndef create_bucket(request, bucket_id):\n    \"\"\"Create a bucket if it doesn't exists.\"\"\"\n    bucket_put = (request.method.lower() == 'put' and\n                  request.path.endswith('buckets/default'))\n\n    if not bucket_put:\n        subrequest = build_request(request, {\n            'method': 'PUT',\n            'path': '/buckets/%s' % bucket_id,\n            'body': {\"data\": {}},\n            'headers': {'If-None-Match': '*'.encode('utf-8')}\n        })\n\n        try:\n            request.invoke_subrequest(subrequest)\n        except HTTPPreconditionFailed:\n            # The bucket already exists\n            pass\n\n\ndef create_collection(request, bucket_id):\n    subpath = request.matchdict.get('subpath')\n    if subpath and subpath.startswith('collections/'):\n        collection_id = subpath.split('/')[1]\n        collection_put = (request.method.lower() == 'put' and\n                          request.path.endswith(collection_id))\n        if not collection_put:\n            subrequest = build_request(request, {\n                'method': 'PUT',\n                'path': '/buckets/%s/collections/%s' % (\n                    bucket_id, collection_id),\n                'body': {\"data\": {}},\n                'headers': {'If-None-Match': '*'.encode('utf-8')}\n            })\n            try:\n                request.invoke_subrequest(subrequest)\n            except HTTPPreconditionFailed:\n                # The collection already exists\n                pass\n\n\n@view_config(route_name='default_bucket', permission=NO_PERMISSION_REQUIRED)\n@view_config(route_name='default_bucket_collection',\n             permission=NO_PERMISSION_REQUIRED)\ndef default_bucket(request):\n    if request.method.lower() == 'options':\n        path = request.path.replace('default', 'unknown')\n        subrequest = build_request(request, {\n            'method': 'OPTIONS',\n            'path': path\n        })\n        return request.invoke_subrequest(subrequest)\n\n    if getattr(request, 'prefixed_userid', None) is None:\n        raise HTTPForbidden  # Pass through the forbidden_view_config\n\n    settings = request.registry.settings\n    hmac_secret = settings['cliquet.userid_hmac_secret']\n    # Build the user unguessable bucket_id UUID from its user_id\n    digest = hmac_digest(hmac_secret, request.prefixed_userid)\n    bucket_id = text_type(UUID(digest[:32]))\n    path = request.path.replace('/buckets/default', '/buckets/%s' % bucket_id)\n    querystring = request.url[(request.url.index(request.path) +\n                               len(request.path)):]\n\n    # Make sure bucket exists\n    create_bucket(request, bucket_id)\n\n    # Make sure the collection exists\n    create_collection(request, bucket_id)\n\n    subrequest = build_request(request, {\n        'method': request.method,\n        'path': path + querystring,\n        'body': request.body\n    })\n\n    try:\n        response = request.invoke_subrequest(subrequest)\n    except HTTPException as error:\n        response = reapply_cors(subrequest, error)\n    return response\n\n\n@resource.register(name='bucket',\n                   collection_methods=('GET',),\n                   collection_path='/buckets',\n                   record_path='/buckets/{{id}}')\nclass Bucket(resource.ProtectedResource):\n    permissions = ('read', 'write', 'collection:create', 'group:create')\n\n    def __init__(self, *args, **kwargs):\n        super(Bucket, self).__init__(*args, **kwargs)\n        self.collection.id_generator = NameGenerator()\n\n    def get_parent_id(self, request):\n        # Buckets are not isolated by user, unlike Cliquet resources.\n        return ''\n\n    def delete(self):\n        result = super(Bucket, self).delete()\n\n        # Delete groups.\n        storage = self.collection.storage\n        parent_id = '/buckets/%s' % self.record_id\n        storage.delete_all(collection_id='group',\n                           parent_id=parent_id,\n                           with_deleted=False)\n        storage.purge_deleted(collection_id='group',\n                              parent_id=parent_id)\n\n        # Delete collections.\n        deleted = storage.delete_all(collection_id='collection',\n                                     parent_id=parent_id,\n                                     with_deleted=False)\n        storage.purge_deleted(collection_id='collection',\n                              parent_id=parent_id)\n\n        # Delete records.\n        id_field = self.collection.id_field\n        for collection in deleted:\n            parent_id = '/buckets/%s/collections/%s' % (self.record_id,\n                                                        collection[id_field])\n            storage.delete_all(collection_id='record',\n                               parent_id=parent_id,\n                               with_deleted=False)\n            storage.purge_deleted(collection_id='record', parent_id=parent_id)\n\n        return result\n", "path": "kinto/views/buckets.py"}], "after_files": [{"content": "from six import text_type\nfrom uuid import UUID\n\nfrom pyramid.httpexceptions import (HTTPForbidden, HTTPPreconditionFailed,\n                                    HTTPException)\nfrom pyramid.security import NO_PERMISSION_REQUIRED\nfrom pyramid.view import view_config\n\nfrom cliquet import resource\nfrom cliquet.utils import hmac_digest, build_request, reapply_cors\n\nfrom kinto.views import NameGenerator\n\n\ndef create_bucket(request, bucket_id):\n    \"\"\"Create a bucket if it doesn't exists.\"\"\"\n    bucket_put = (request.method.lower() == 'put' and\n                  request.path.endswith('buckets/default'))\n\n    if not bucket_put:\n        subrequest = build_request(request, {\n            'method': 'PUT',\n            'path': '/buckets/%s' % bucket_id,\n            'body': {\"data\": {}},\n            'headers': {'If-None-Match': '*'.encode('utf-8')}\n        })\n\n        try:\n            request.invoke_subrequest(subrequest)\n        except HTTPPreconditionFailed:\n            # The bucket already exists\n            pass\n\n\ndef create_collection(request, bucket_id):\n    subpath = request.matchdict.get('subpath')\n    if subpath and subpath.startswith('collections/'):\n        collection_id = subpath.split('/')[1]\n        collection_put = (request.method.lower() == 'put' and\n                          request.path.endswith(collection_id))\n        if not collection_put:\n            subrequest = build_request(request, {\n                'method': 'PUT',\n                'path': '/buckets/%s/collections/%s' % (\n                    bucket_id, collection_id),\n                'body': {\"data\": {}},\n                'headers': {'If-None-Match': '*'.encode('utf-8')}\n            })\n            try:\n                request.invoke_subrequest(subrequest)\n            except HTTPPreconditionFailed:\n                # The collection already exists\n                pass\n\n\n@view_config(route_name='default_bucket', permission=NO_PERMISSION_REQUIRED)\n@view_config(route_name='default_bucket_collection',\n             permission=NO_PERMISSION_REQUIRED)\ndef default_bucket(request):\n    if request.method.lower() == 'options':\n        path = request.path.replace('default', 'unknown')\n        subrequest = build_request(request, {\n            'method': 'OPTIONS',\n            'path': path\n        })\n        return request.invoke_subrequest(subrequest)\n\n    if getattr(request, 'prefixed_userid', None) is None:\n        raise HTTPForbidden  # Pass through the forbidden_view_config\n\n    settings = request.registry.settings\n    hmac_secret = settings['cliquet.userid_hmac_secret']\n    # Build the user unguessable bucket_id UUID from its user_id\n    digest = hmac_digest(hmac_secret, request.prefixed_userid)\n    bucket_id = text_type(UUID(digest[:32]))\n    path = request.path.replace('/buckets/default', '/buckets/%s' % bucket_id)\n    querystring = request.url[(request.url.index(request.path) +\n                               len(request.path)):]\n\n    # Make sure bucket exists\n    create_bucket(request, bucket_id)\n\n    # Make sure the collection exists\n    create_collection(request, bucket_id)\n\n    subrequest = build_request(request, {\n        'method': request.method,\n        'path': path + querystring,\n        'body': request.body\n    })\n\n    try:\n        response = request.invoke_subrequest(subrequest)\n    except HTTPException as error:\n        response = reapply_cors(subrequest, error)\n    return response\n\n\n@resource.register(name='bucket',\n                   collection_methods=('GET', 'POST'),\n                   collection_path='/buckets',\n                   record_path='/buckets/{{id}}')\nclass Bucket(resource.ProtectedResource):\n    permissions = ('read', 'write', 'collection:create', 'group:create')\n\n    def __init__(self, *args, **kwargs):\n        super(Bucket, self).__init__(*args, **kwargs)\n        self.collection.id_generator = NameGenerator()\n\n    def get_parent_id(self, request):\n        # Buckets are not isolated by user, unlike Cliquet resources.\n        return ''\n\n    def delete(self):\n        result = super(Bucket, self).delete()\n\n        # Delete groups.\n        storage = self.collection.storage\n        parent_id = '/buckets/%s' % self.record_id\n        storage.delete_all(collection_id='group',\n                           parent_id=parent_id,\n                           with_deleted=False)\n        storage.purge_deleted(collection_id='group',\n                              parent_id=parent_id)\n\n        # Delete collections.\n        deleted = storage.delete_all(collection_id='collection',\n                                     parent_id=parent_id,\n                                     with_deleted=False)\n        storage.purge_deleted(collection_id='collection',\n                              parent_id=parent_id)\n\n        # Delete records.\n        id_field = self.collection.id_field\n        for collection in deleted:\n            parent_id = '/buckets/%s/collections/%s' % (self.record_id,\n                                                        collection[id_field])\n            storage.delete_all(collection_id='record',\n                               parent_id=parent_id,\n                               with_deleted=False)\n            storage.purge_deleted(collection_id='record', parent_id=parent_id)\n\n        return result\n", "path": "kinto/views/buckets.py"}]}