prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Relax record id validation
  Do we really need to ensure that posted record ids match a uuid regex?
  
  We can generate a uuid when a record without id is posted, and leave the usage of uuid in our official clients.
  But is there any reason to use a different regex that collection and bucket names?
  
  edit: The usecase is the Web sync extension chrome.storage.sync: since any key is accepted, it takes the md5 of the key to "generate" UUIDs. Instead we could let the client push any key as record id.
  - Related #140 
  
  
  --- 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/records.py`
  Content:
  ```
  1 import copy
  2 
  3 import jsonschema
  4 from kinto.core import resource
  5 from kinto.core.errors import raise_invalid
  6 from jsonschema import exceptions as jsonschema_exceptions
  7 from pyramid.security import Authenticated
  8 from pyramid.settings import asbool
  9 
  10 from kinto.views import object_exists_or_404
  11 
  12 
  13 class RecordSchema(resource.ResourceSchema):
  14     class Options:
  15         preserve_unknown = True
  16 
  17 
  18 _parent_path = '/buckets/{{bucket_id}}/collections/{{collection_id}}'
  19 
  20 
  21 @resource.register(name='record',
  22                    collection_path=_parent_path + '/records',
  23                    record_path=_parent_path + '/records/{{id}}')
  24 class Record(resource.ShareableResource):
  25 
  26     mapping = RecordSchema()
  27     schema_field = 'schema'
  28 
  29     def __init__(self, *args, **kwargs):
  30         super(Record, self).__init__(*args, **kwargs)
  31 
  32         # Check if already fetched before (in batch).
  33         collections = self.request.bound_data.setdefault('collections', {})
  34         collection_uri = self.get_parent_id(self.request)
  35         if collection_uri not in collections:
  36             # Unknown yet, fetch from storage.
  37             collection_parent_id = '/buckets/%s' % self.bucket_id
  38             collection = object_exists_or_404(self.request,
  39                                               collection_id='collection',
  40                                               parent_id=collection_parent_id,
  41                                               object_id=self.collection_id)
  42             collections[collection_uri] = collection
  43 
  44         self._collection = collections[collection_uri]
  45 
  46     def get_parent_id(self, request):
  47         self.bucket_id = request.matchdict['bucket_id']
  48         self.collection_id = request.matchdict['collection_id']
  49         return '/buckets/%s/collections/%s' % (self.bucket_id,
  50                                                self.collection_id)
  51 
  52     def is_known_field(self, field_name):
  53         """Without schema, any field is considered as known."""
  54         return True
  55 
  56     def process_record(self, new, old=None):
  57         """Validate records against collection schema, if any."""
  58         new = super(Record, self).process_record(new, old)
  59 
  60         schema = self._collection.get('schema')
  61         settings = self.request.registry.settings
  62         schema_validation = 'experimental_collection_schema_validation'
  63         if not schema or not asbool(settings.get(schema_validation)):
  64             return new
  65 
  66         collection_timestamp = self._collection[self.model.modified_field]
  67 
  68         try:
  69             stripped = copy.deepcopy(new)
  70             stripped.pop(self.model.id_field, None)
  71             stripped.pop(self.model.modified_field, None)
  72             stripped.pop(self.model.permissions_field, None)
  73             stripped.pop(self.schema_field, None)
  74             jsonschema.validate(stripped, schema)
  75         except jsonschema_exceptions.ValidationError as e:
  76             try:
  77                 field = e.path.pop() if e.path else e.validator_value.pop()
  78             except AttributeError:
  79                 field = None
  80             raise_invalid(self.request, name=field, description=e.message)
  81 
  82         new[self.schema_field] = collection_timestamp
  83         return new
  84 
  85     def collection_get(self):
  86         result = super(Record, self).collection_get()
  87         self._handle_cache_expires(self.request.response)
  88         return result
  89 
  90     def get(self):
  91         result = super(Record, self).get()
  92         self._handle_cache_expires(self.request.response)
  93         return result
  94 
  95     def _handle_cache_expires(self, response):
  96         """If the parent collection defines a ``cache_expires`` attribute,
  97         then cache-control response headers are sent.
  98 
  99         .. note::
  100 
  101             Those headers are also sent if the
  102             ``kinto.record_cache_expires_seconds`` setting is defined.
  103         """
  104         is_anonymous = Authenticated not in self.request.effective_principals
  105         if not is_anonymous:
  106             return
  107 
  108         cache_expires = self._collection.get('cache_expires')
  109         if cache_expires is None:
  110             by_bucket = '%s_record_cache_expires_seconds' % (self.bucket_id)
  111             by_collection = '%s_%s_record_cache_expires_seconds' % (
  112                 self.bucket_id, self.collection_id)
  113             settings = self.request.registry.settings
  114             cache_expires = settings.get(by_collection,
  115                                          settings.get(by_bucket))
  116 
  117         if cache_expires is not None:
  118             response.cache_expires(seconds=int(cache_expires))
  119
  ```
  
  Path: `kinto/views/__init__.py`
  Content:
  ```
  1 import random
  2 import string
  3 
  4 from kinto.core.storage import generators, exceptions
  5 from pyramid import httpexceptions
  6 
  7 
  8 class NameGenerator(generators.Generator):
  9     def __call__(self):
  10         ascii_letters = ('abcdefghijklmopqrstuvwxyz'
  11                          'ABCDEFGHIJKLMOPQRSTUVWXYZ')
  12         alphabet = ascii_letters + string.digits + '-_'
  13         letters = [random.choice(ascii_letters + string.digits)]
  14         letters += [random.choice(alphabet) for x in range(7)]
  15         return ''.join(letters)
  16 
  17 
  18 def object_exists_or_404(request, collection_id, object_id, parent_id=''):
  19     storage = request.registry.storage
  20     try:
  21         return storage.get(collection_id=collection_id,
  22                            parent_id=parent_id,
  23                            object_id=object_id)
  24     except exceptions.RecordNotFoundError:
  25         # XXX: We gave up putting details about parent id here (See #53).
  26         raise httpexceptions.HTTPNotFound()
  27
  ```
  --- 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()
  
  ```
  
golden_diff: diff --git a/kinto/views/__init__.py b/kinto/views/__init__.py
  --- a/kinto/views/__init__.py
  +++ b/kinto/views/__init__.py
  @@ -15,6 +15,12 @@
           return ''.join(letters)
   
   
  +class RelaxedUUID(generators.UUID4):
  +    """A generator that generates UUIDs but accepts any string.
  +    """
  +    regexp = generators.Generator.regexp
  +
  +
   def object_exists_or_404(request, collection_id, object_id, parent_id=''):
       storage = request.registry.storage
       try:
  diff --git a/kinto/views/records.py b/kinto/views/records.py
  --- a/kinto/views/records.py
  +++ b/kinto/views/records.py
  @@ -7,7 +7,7 @@
   from pyramid.security import Authenticated
   from pyramid.settings import asbool
   
  -from kinto.views import object_exists_or_404
  +from kinto.views import RelaxedUUID, object_exists_or_404
   
   
   class RecordSchema(resource.ResourceSchema):
  @@ -29,6 +29,8 @@
       def __init__(self, *args, **kwargs):
           super(Record, self).__init__(*args, **kwargs)
   
  +        self.model.id_generator = RelaxedUUID()
  +
           # Check if already fetched before (in batch).
           collections = self.request.bound_data.setdefault('collections', {})
           collection_uri = self.get_parent_id(self.request)
  
verification_info: {"golden_diff": "diff --git a/kinto/views/__init__.py b/kinto/views/__init__.py\n--- a/kinto/views/__init__.py\n+++ b/kinto/views/__init__.py\n@@ -15,6 +15,12 @@\n         return ''.join(letters)\n \n \n+class RelaxedUUID(generators.UUID4):\n+    \"\"\"A generator that generates UUIDs but accepts any string.\n+    \"\"\"\n+    regexp = generators.Generator.regexp\n+\n+\n def object_exists_or_404(request, collection_id, object_id, parent_id=''):\n     storage = request.registry.storage\n     try:\ndiff --git a/kinto/views/records.py b/kinto/views/records.py\n--- a/kinto/views/records.py\n+++ b/kinto/views/records.py\n@@ -7,7 +7,7 @@\n from pyramid.security import Authenticated\n from pyramid.settings import asbool\n \n-from kinto.views import object_exists_or_404\n+from kinto.views import RelaxedUUID, object_exists_or_404\n \n \n class RecordSchema(resource.ResourceSchema):\n@@ -29,6 +29,8 @@\n     def __init__(self, *args, **kwargs):\n         super(Record, self).__init__(*args, **kwargs)\n \n+        self.model.id_generator = RelaxedUUID()\n+\n         # Check if already fetched before (in batch).\n         collections = self.request.bound_data.setdefault('collections', {})\n         collection_uri = self.get_parent_id(self.request)\n", "issue": "Relax record id validation\nDo we really need to ensure that posted record ids match a uuid regex?\n\nWe can generate a uuid when a record without id is posted, and leave the usage of uuid in our official clients.\nBut is there any reason to use a different regex that collection and bucket names?\n\nedit: The usecase is the Web sync extension chrome.storage.sync: since any key is accepted, it takes the md5 of the key to \"generate\" UUIDs. Instead we could let the client push any key as record id.\n- Related #140 \n\n", "before_files": [{"content": "import copy\n\nimport jsonschema\nfrom kinto.core import resource\nfrom kinto.core.errors import raise_invalid\nfrom jsonschema import exceptions as jsonschema_exceptions\nfrom pyramid.security import Authenticated\nfrom pyramid.settings import asbool\n\nfrom kinto.views import object_exists_or_404\n\n\nclass RecordSchema(resource.ResourceSchema):\n    class Options:\n        preserve_unknown = True\n\n\n_parent_path = '/buckets/{{bucket_id}}/collections/{{collection_id}}'\n\n\n@resource.register(name='record',\n                   collection_path=_parent_path + '/records',\n                   record_path=_parent_path + '/records/{{id}}')\nclass Record(resource.ShareableResource):\n\n    mapping = RecordSchema()\n    schema_field = 'schema'\n\n    def __init__(self, *args, **kwargs):\n        super(Record, self).__init__(*args, **kwargs)\n\n        # Check if already fetched before (in batch).\n        collections = self.request.bound_data.setdefault('collections', {})\n        collection_uri = self.get_parent_id(self.request)\n        if collection_uri not in collections:\n            # Unknown yet, fetch from storage.\n            collection_parent_id = '/buckets/%s' % self.bucket_id\n            collection = object_exists_or_404(self.request,\n                                              collection_id='collection',\n                                              parent_id=collection_parent_id,\n                                              object_id=self.collection_id)\n            collections[collection_uri] = collection\n\n        self._collection = collections[collection_uri]\n\n    def get_parent_id(self, request):\n        self.bucket_id = request.matchdict['bucket_id']\n        self.collection_id = request.matchdict['collection_id']\n        return '/buckets/%s/collections/%s' % (self.bucket_id,\n                                               self.collection_id)\n\n    def is_known_field(self, field_name):\n        \"\"\"Without schema, any field is considered as known.\"\"\"\n        return True\n\n    def process_record(self, new, old=None):\n        \"\"\"Validate records against collection schema, if any.\"\"\"\n        new = super(Record, self).process_record(new, old)\n\n        schema = self._collection.get('schema')\n        settings = self.request.registry.settings\n        schema_validation = 'experimental_collection_schema_validation'\n        if not schema or not asbool(settings.get(schema_validation)):\n            return new\n\n        collection_timestamp = self._collection[self.model.modified_field]\n\n        try:\n            stripped = copy.deepcopy(new)\n            stripped.pop(self.model.id_field, None)\n            stripped.pop(self.model.modified_field, None)\n            stripped.pop(self.model.permissions_field, None)\n            stripped.pop(self.schema_field, None)\n            jsonschema.validate(stripped, schema)\n        except jsonschema_exceptions.ValidationError as e:\n            try:\n                field = e.path.pop() if e.path else e.validator_value.pop()\n            except AttributeError:\n                field = None\n            raise_invalid(self.request, name=field, description=e.message)\n\n        new[self.schema_field] = collection_timestamp\n        return new\n\n    def collection_get(self):\n        result = super(Record, self).collection_get()\n        self._handle_cache_expires(self.request.response)\n        return result\n\n    def get(self):\n        result = super(Record, self).get()\n        self._handle_cache_expires(self.request.response)\n        return result\n\n    def _handle_cache_expires(self, response):\n        \"\"\"If the parent collection defines a ``cache_expires`` attribute,\n        then cache-control response headers are sent.\n\n        .. note::\n\n            Those headers are also sent if the\n            ``kinto.record_cache_expires_seconds`` setting is defined.\n        \"\"\"\n        is_anonymous = Authenticated not in self.request.effective_principals\n        if not is_anonymous:\n            return\n\n        cache_expires = self._collection.get('cache_expires')\n        if cache_expires is None:\n            by_bucket = '%s_record_cache_expires_seconds' % (self.bucket_id)\n            by_collection = '%s_%s_record_cache_expires_seconds' % (\n                self.bucket_id, self.collection_id)\n            settings = self.request.registry.settings\n            cache_expires = settings.get(by_collection,\n                                         settings.get(by_bucket))\n\n        if cache_expires is not None:\n            response.cache_expires(seconds=int(cache_expires))\n", "path": "kinto/views/records.py"}, {"content": "import random\nimport string\n\nfrom kinto.core.storage import generators, exceptions\nfrom pyramid import httpexceptions\n\n\nclass NameGenerator(generators.Generator):\n    def __call__(self):\n        ascii_letters = ('abcdefghijklmopqrstuvwxyz'\n                         'ABCDEFGHIJKLMOPQRSTUVWXYZ')\n        alphabet = ascii_letters + string.digits + '-_'\n        letters = [random.choice(ascii_letters + string.digits)]\n        letters += [random.choice(alphabet) for x in range(7)]\n        return ''.join(letters)\n\n\ndef object_exists_or_404(request, collection_id, object_id, parent_id=''):\n    storage = request.registry.storage\n    try:\n        return storage.get(collection_id=collection_id,\n                           parent_id=parent_id,\n                           object_id=object_id)\n    except exceptions.RecordNotFoundError:\n        # XXX: We gave up putting details about parent id here (See #53).\n        raise httpexceptions.HTTPNotFound()\n", "path": "kinto/views/__init__.py"}], "after_files": [{"content": "import copy\n\nimport jsonschema\nfrom kinto.core import resource\nfrom kinto.core.errors import raise_invalid\nfrom jsonschema import exceptions as jsonschema_exceptions\nfrom pyramid.security import Authenticated\nfrom pyramid.settings import asbool\n\nfrom kinto.views import RelaxedUUID, object_exists_or_404\n\n\nclass RecordSchema(resource.ResourceSchema):\n    class Options:\n        preserve_unknown = True\n\n\n_parent_path = '/buckets/{{bucket_id}}/collections/{{collection_id}}'\n\n\n@resource.register(name='record',\n                   collection_path=_parent_path + '/records',\n                   record_path=_parent_path + '/records/{{id}}')\nclass Record(resource.ShareableResource):\n\n    mapping = RecordSchema()\n    schema_field = 'schema'\n\n    def __init__(self, *args, **kwargs):\n        super(Record, self).__init__(*args, **kwargs)\n\n        self.model.id_generator = RelaxedUUID()\n\n        # Check if already fetched before (in batch).\n        collections = self.request.bound_data.setdefault('collections', {})\n        collection_uri = self.get_parent_id(self.request)\n        if collection_uri not in collections:\n            # Unknown yet, fetch from storage.\n            collection_parent_id = '/buckets/%s' % self.bucket_id\n            collection = object_exists_or_404(self.request,\n                                              collection_id='collection',\n                                              parent_id=collection_parent_id,\n                                              object_id=self.collection_id)\n            collections[collection_uri] = collection\n\n        self._collection = collections[collection_uri]\n\n    def get_parent_id(self, request):\n        self.bucket_id = request.matchdict['bucket_id']\n        self.collection_id = request.matchdict['collection_id']\n        return '/buckets/%s/collections/%s' % (self.bucket_id,\n                                               self.collection_id)\n\n    def is_known_field(self, field_name):\n        \"\"\"Without schema, any field is considered as known.\"\"\"\n        return True\n\n    def process_record(self, new, old=None):\n        \"\"\"Validate records against collection schema, if any.\"\"\"\n        new = super(Record, self).process_record(new, old)\n\n        schema = self._collection.get('schema')\n        settings = self.request.registry.settings\n        schema_validation = 'experimental_collection_schema_validation'\n        if not schema or not asbool(settings.get(schema_validation)):\n            return new\n\n        collection_timestamp = self._collection[self.model.modified_field]\n\n        try:\n            stripped = copy.deepcopy(new)\n            stripped.pop(self.model.id_field, None)\n            stripped.pop(self.model.modified_field, None)\n            stripped.pop(self.model.permissions_field, None)\n            stripped.pop(self.schema_field, None)\n            jsonschema.validate(stripped, schema)\n        except jsonschema_exceptions.ValidationError as e:\n            try:\n                field = e.path.pop() if e.path else e.validator_value.pop()\n            except AttributeError:\n                field = None\n            raise_invalid(self.request, name=field, description=e.message)\n\n        new[self.schema_field] = collection_timestamp\n        return new\n\n    def collection_get(self):\n        result = super(Record, self).collection_get()\n        self._handle_cache_expires(self.request.response)\n        return result\n\n    def get(self):\n        result = super(Record, self).get()\n        self._handle_cache_expires(self.request.response)\n        return result\n\n    def _handle_cache_expires(self, response):\n        \"\"\"If the parent collection defines a ``cache_expires`` attribute,\n        then cache-control response headers are sent.\n\n        .. note::\n\n            Those headers are also sent if the\n            ``kinto.record_cache_expires_seconds`` setting is defined.\n        \"\"\"\n        is_anonymous = Authenticated not in self.request.effective_principals\n        if not is_anonymous:\n            return\n\n        cache_expires = self._collection.get('cache_expires')\n        if cache_expires is None:\n            by_bucket = '%s_record_cache_expires_seconds' % (self.bucket_id)\n            by_collection = '%s_%s_record_cache_expires_seconds' % (\n                self.bucket_id, self.collection_id)\n            settings = self.request.registry.settings\n            cache_expires = settings.get(by_collection,\n                                         settings.get(by_bucket))\n\n        if cache_expires is not None:\n            response.cache_expires(seconds=int(cache_expires))\n", "path": "kinto/views/records.py"}, {"content": "import random\nimport string\n\nfrom kinto.core.storage import generators, exceptions\nfrom pyramid import httpexceptions\n\n\nclass NameGenerator(generators.Generator):\n    def __call__(self):\n        ascii_letters = ('abcdefghijklmopqrstuvwxyz'\n                         'ABCDEFGHIJKLMOPQRSTUVWXYZ')\n        alphabet = ascii_letters + string.digits + '-_'\n        letters = [random.choice(ascii_letters + string.digits)]\n        letters += [random.choice(alphabet) for x in range(7)]\n        return ''.join(letters)\n\n\nclass RelaxedUUID(generators.UUID4):\n    \"\"\"A generator that generates UUIDs but accepts any string.\n    \"\"\"\n    regexp = generators.Generator.regexp\n\n\ndef object_exists_or_404(request, collection_id, object_id, parent_id=''):\n    storage = request.registry.storage\n    try:\n        return storage.get(collection_id=collection_id,\n                           parent_id=parent_id,\n                           object_id=object_id)\n    except exceptions.RecordNotFoundError:\n        # XXX: We gave up putting details about parent id here (See #53).\n        raise httpexceptions.HTTPNotFound()\n", "path": "kinto/views/__init__.py"}]}