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Extract common logic to BaseSchemaGenerator

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This commit is contained in:
Carlton Gibson 2018-08-09 11:13:03 +02:00
parent 7428f58ee4
commit 2e5eb81a25
1 changed files with 109 additions and 100 deletions
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209
rest_framework/schemas/generators.py
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@ -241,35 +241,18 @@ class EndpointEnumerator(object):
return [method for method in methods if method not in ('OPTIONS', 'HEAD')]
class SchemaGenerator(object):
# Map HTTP methods onto actions.
default_mapping = {
'get': 'retrieve',
'post': 'create',
'put': 'update',
'patch': 'partial_update',
'delete': 'destroy',
}
class BaseSchemaGenerator(object):
endpoint_inspector_cls = EndpointEnumerator
# Map the method names we use for viewset actions onto external schema names.
# These give us names that are more suitable for the external representation.
# Set by 'SCHEMA_COERCE_METHOD_NAMES'.
coerce_method_names = None
# 'pk' isn't great as an externally exposed name for an identifier,
# so by default we prefer to use the actual model field name for schemas.
# Set by 'SCHEMA_COERCE_PATH_PK'.
coerce_path_pk = None
def __init__(self, title=None, url=None, description=None, patterns=None, urlconf=None):
assert coreapi, '`coreapi` must be installed for schema support.'
assert coreschema, '`coreschema` must be installed for schema support.'
if url and not url.endswith('/'):
url += '/'
self.coerce_method_names = api_settings.SCHEMA_COERCE_METHOD_NAMES
self.coerce_path_pk = api_settings.SCHEMA_COERCE_PATH_PK
self.patterns = patterns
@ -279,55 +262,11 @@ class SchemaGenerator(object):
self.url = url
self.endpoints = None
def get_schema(self, request=None, public=False):
"""
Generate a `coreapi.Document` representing the API schema.
"""
self._initialise_endpoints()
links = self.get_links(None if public else request)
if not links:
return None
url = self.url
if not url and request is not None:
url = request.build_absolute_uri()
distribute_links(links)
return coreapi.Document(
title=self.title, description=self.description,
url=url, content=links
)
def _initialise_endpoints(self):
if self.endpoints is None:
inspector = self.endpoint_inspector_cls(self.patterns, self.urlconf)
self.endpoints = inspector.get_api_endpoints()
def get_links(self, request=None):
"""
Return a dictionary containing all the links that should be
included in the API schema.
"""
links = LinkNode()
paths, view_endpoints = self._get_paths_and_endpoints(request)
# Only generate the path prefix for paths that will be included
if not paths:
return None
prefix = self.determine_path_prefix(paths)
for path, method, view in view_endpoints:
if not self.has_view_permissions(path, method, view):
continue
link = view.schema.get_link(path, method, base_url=self.url)
subpath = path[len(prefix):]
keys = self.get_keys(subpath, method, view)
insert_into(links, keys, link)
return links
def _get_paths_and_endpoints(self, request):
"""
Generate (path, method, view) given (path, method, callback) for paths.
@ -342,7 +281,46 @@ class SchemaGenerator(object):
return paths, view_endpoints
# Methods used when we generate a view instance from the raw callback...
def create_view(self, callback, method, request=None):
"""
Given a callback, return an actual view instance.
"""
view = callback.cls(**getattr(callback, 'initkwargs', {}))
view.args = ()
view.kwargs = {}
view.format_kwarg = None
view.request = None
view.action_map = getattr(callback, 'actions', None)
actions = getattr(callback, 'actions', None)
if actions is not None:
if method == 'OPTIONS':
view.action = 'metadata'
else:
view.action = actions.get(method.lower())
if request is not None:
view.request = clone_request(request, method)
return view
def coerce_path(self, path, method, view):
"""
Coerce {pk} path arguments into the name of the model field,
where possible. This is cleaner for an external representation.
(Ie. "this is an identifier", not "this is a database primary key")
"""
if not self.coerce_path_pk or '{pk}' not in path:
return path
model = getattr(getattr(view, 'queryset', None), 'model', None)
if model:
field_name = get_pk_name(model)
else:
field_name = 'id'
return path.replace('{pk}', '{%s}' % field_name)
def get_schema(self, request=None, public=False):
raise NotImplementedError(".get_schema() must be implemented in subclasses.")
def determine_path_prefix(self, paths):
"""
@ -375,29 +353,6 @@ class SchemaGenerator(object):
prefixes.append('/' + prefix + '/')
return common_path(prefixes)
def create_view(self, callback, method, request=None):
"""
Given a callback, return an actual view instance.
"""
view = callback.cls(**getattr(callback, 'initkwargs', {}))
view.args = ()
view.kwargs = {}
view.format_kwarg = None
view.request = None
view.action_map = getattr(callback, 'actions', None)
actions = getattr(callback, 'actions', None)
if actions is not None:
if method == 'OPTIONS':
view.action = 'metadata'
else:
view.action = actions.get(method.lower())
if request is not None:
view.request = clone_request(request, method)
return view
def has_view_permissions(self, path, method, view):
"""
Return `True` if the incoming request has the correct view permissions.
@ -411,23 +366,77 @@ class SchemaGenerator(object):
return False
return True
def coerce_path(self, path, method, view):
class SchemaGenerator(BaseSchemaGenerator):
"""
Original CoreAPI version.
"""
# Map HTTP methods onto actions.
default_mapping = {
'get': 'retrieve',
'post': 'create',
'put': 'update',
'patch': 'partial_update',
'delete': 'destroy',
}
# Map the method names we use for viewset actions onto external schema names.
# These give us names that are more suitable for the external representation.
# Set by 'SCHEMA_COERCE_METHOD_NAMES'.
coerce_method_names = None
def __init__(self, title=None, url=None, description=None, patterns=None, urlconf=None):
assert coreapi, '`coreapi` must be installed for schema support.'
assert coreschema, '`coreschema` must be installed for schema support.'
super(SchemaGenerator, self).__init__(title, url, description, patterns, urlconf)
self.coerce_method_names = api_settings.SCHEMA_COERCE_METHOD_NAMES
def get_links(self, request=None):
"""
Coerce {pk} path arguments into the name of the model field,
where possible. This is cleaner for an external representation.
(Ie. "this is an identifier", not "this is a database primary key")
Return a dictionary containing all the links that should be
included in the API schema.
"""
if not self.coerce_path_pk or '{pk}' not in path:
return path
model = getattr(getattr(view, 'queryset', None), 'model', None)
if model:
field_name = get_pk_name(model)
else:
field_name = 'id'
return path.replace('{pk}', '{%s}' % field_name)
links = LinkNode()
paths, view_endpoints = self._get_paths_and_endpoints(request)
# Only generate the path prefix for paths that will be included
if not paths:
return None
prefix = self.determine_path_prefix(paths)
for path, method, view in view_endpoints:
if not self.has_view_permissions(path, method, view):
continue
link = view.schema.get_link(path, method, base_url=self.url)
subpath = path[len(prefix):]
keys = self.get_keys(subpath, method, view)
insert_into(links, keys, link)
return links
def get_schema(self, request=None, public=False):
"""
Generate a `coreapi.Document` representing the API schema.
"""
self._initialise_endpoints()
links = self.get_links(None if public else request)
if not links:
return None
url = self.url
if not url and request is not None:
url = request.build_absolute_uri()
distribute_links(links)
return coreapi.Document(
title=self.title, description=self.description,
url=url, content=links
)
# Method for generating the link layout....
def get_keys(self, subpath, method, view):
"""
Return a list of keys that should be used to layout a link within
@ -473,7 +482,7 @@ class SchemaGenerator(object):
return named_path_components + [action]
class OpenAPISchemaGenerator(SchemaGenerator):
class OpenAPISchemaGenerator(BaseSchemaGenerator):
def get_paths(self, request=None):
result = OrderedDict()