mirror of
https://github.com/encode/django-rest-framework.git
synced 2024-09-21 03:19:00 +03:00
691 lines
25 KiB
Python
691 lines
25 KiB
Python
import re
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import warnings
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from collections import OrderedDict
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from decimal import Decimal
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from operator import attrgetter
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from urllib.parse import urljoin
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from django.core.validators import (
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DecimalValidator, EmailValidator, MaxLengthValidator, MaxValueValidator,
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MinLengthValidator, MinValueValidator, RegexValidator, URLValidator
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)
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from django.db import models
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from django.utils.encoding import force_str
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from rest_framework import exceptions, renderers, serializers
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from rest_framework.compat import uritemplate
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from rest_framework.fields import _UnvalidatedField, empty
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from rest_framework.settings import api_settings
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from .generators import BaseSchemaGenerator
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from .inspectors import ViewInspector
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from .utils import get_pk_description, is_list_view
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class SchemaGenerator(BaseSchemaGenerator):
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def get_info(self):
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# Title and version are required by openapi specification 3.x
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info = {
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'title': self.title or '',
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'version': self.version or ''
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}
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if self.description is not None:
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info['description'] = self.description
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return info
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def check_duplicate_operation_id(self, paths):
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ids = {}
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for route in paths:
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for method in paths[route]:
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if 'operationId' not in paths[route][method]:
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continue
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operation_id = paths[route][method]['operationId']
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if operation_id in ids:
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warnings.warn(
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'You have a duplicated operationId in your OpenAPI schema: {operation_id}\n'
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'\tRoute: {route1}, Method: {method1}\n'
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'\tRoute: {route2}, Method: {method2}\n'
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'\tAn operationId has to be unique accros your schema. Your schema may not work in other tools.'
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.format(
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route1=ids[operation_id]['route'],
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method1=ids[operation_id]['method'],
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route2=route,
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method2=method,
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operation_id=operation_id
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)
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)
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ids[operation_id] = {
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'route': route,
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'method': method
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}
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def get_schema(self, request=None, public=False):
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"""
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Generate a OpenAPI schema.
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"""
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self._initialise_endpoints()
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components_schemas = {}
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# Iterate endpoints generating per method path operations.
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paths = {}
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_, view_endpoints = self._get_paths_and_endpoints(None if public else request)
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for path, method, view in view_endpoints:
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if not self.has_view_permissions(path, method, view):
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continue
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operation = view.schema.get_operation(path, method)
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components = view.schema.get_components(path, method)
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for k in components.keys():
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if k not in components_schemas:
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continue
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if components_schemas[k] == components[k]:
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continue
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warnings.warn('Schema component "{}" has been overriden with a different value.'.format(k))
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components_schemas.update(components)
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# Normalise path for any provided mount url.
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if path.startswith('/'):
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path = path[1:]
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path = urljoin(self.url or '/', path)
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paths.setdefault(path, {})
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paths[path][method.lower()] = operation
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self.check_duplicate_operation_id(paths)
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# Compile final schema.
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schema = {
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'openapi': '3.0.2',
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'info': self.get_info(),
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'paths': paths,
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}
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if len(components_schemas) > 0:
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schema['components'] = {
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'schemas': components_schemas
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}
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return schema
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# View Inspectors
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class AutoSchema(ViewInspector):
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def __init__(self, tags=None, operation_id_base=None, component_name=None):
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"""
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:param operation_id_base: user-defined name in operationId. If empty, it will be deducted from the Model/Serializer/View name.
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:param component_name: user-defined component's name. If empty, it will be deducted from the Serializer's class name.
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"""
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if tags and not all(isinstance(tag, str) for tag in tags):
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raise ValueError('tags must be a list or tuple of string.')
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self._tags = tags
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self.operation_id_base = operation_id_base
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self.component_name = component_name
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super().__init__()
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request_media_types = []
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response_media_types = []
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method_mapping = {
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'get': 'retrieve',
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'post': 'create',
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'put': 'update',
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'patch': 'partialUpdate',
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'delete': 'destroy',
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}
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def get_operation(self, path, method):
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operation = {}
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operation['operationId'] = self.get_operation_id(path, method)
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operation['description'] = self.get_description(path, method)
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parameters = []
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parameters += self._get_path_parameters(path, method)
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parameters += self._get_pagination_parameters(path, method)
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parameters += self._get_filter_parameters(path, method)
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operation['parameters'] = parameters
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request_body = self._get_request_body(path, method)
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if request_body:
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operation['requestBody'] = request_body
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operation['responses'] = self._get_responses(path, method)
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operation['tags'] = self.get_tags(path, method)
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return operation
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def get_component_name(self, serializer):
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"""
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Compute the component's name from the serializer.
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Raise an exception if the serializer's class name is "Serializer" (case-insensitive).
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"""
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if self.component_name is not None:
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return self.component_name
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# use the serializer's class name as the component name.
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component_name = serializer.__class__.__name__
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# We remove the "serializer" string from the class name.
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pattern = re.compile("serializer", re.IGNORECASE)
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component_name = pattern.sub("", component_name)
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if component_name == "":
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raise Exception(
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'"{}" is an invalid class name for schema generation. '
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'Serializer\'s class name should be unique and explicit. e.g. "ItemSerializer"'
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.format(serializer.__class__.__name__)
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)
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return component_name
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def get_components(self, path, method):
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"""
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Return components with their properties from the serializer.
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"""
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if method.lower() == 'delete':
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return {}
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serializer = self._get_serializer(path, method)
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if not isinstance(serializer, serializers.Serializer):
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return {}
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component_name = self.get_component_name(serializer)
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content = self._map_serializer(serializer)
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return {component_name: content}
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def _to_camel_case(self, snake_str):
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components = snake_str.split('_')
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# We capitalize the first letter of each component except the first one
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# with the 'title' method and join them together.
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return components[0] + ''.join(x.title() for x in components[1:])
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def get_operation_id_base(self, path, method, action):
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"""
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Compute the base part for operation ID from the model, serializer or view name.
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"""
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model = getattr(getattr(self.view, 'queryset', None), 'model', None)
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if self.operation_id_base is not None:
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name = self.operation_id_base
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# Try to deduce the ID from the view's model
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elif model is not None:
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name = model.__name__
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# Try with the serializer class name
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elif self._get_serializer(path, method) is not None:
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name = self._get_serializer(path, method).__class__.__name__
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if name.endswith('Serializer'):
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name = name[:-10]
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# Fallback to the view name
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else:
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name = self.view.__class__.__name__
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if name.endswith('APIView'):
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name = name[:-7]
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elif name.endswith('View'):
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name = name[:-4]
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# Due to camel-casing of classes and `action` being lowercase, apply title in order to find if action truly
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# comes at the end of the name
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if name.endswith(action.title()): # ListView, UpdateAPIView, ThingDelete ...
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name = name[:-len(action)]
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if action == 'list' and not name.endswith('s'): # listThings instead of listThing
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name += 's'
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return name
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def get_operation_id(self, path, method):
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"""
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Compute an operation ID from the view type and get_operation_id_base method.
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"""
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method_name = getattr(self.view, 'action', method.lower())
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if is_list_view(path, method, self.view):
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action = 'list'
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elif method_name not in self.method_mapping:
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action = self._to_camel_case(method_name)
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else:
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action = self.method_mapping[method.lower()]
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name = self.get_operation_id_base(path, method, action)
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return action + name
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def _get_path_parameters(self, path, method):
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"""
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Return a list of parameters from templated path variables.
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"""
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assert uritemplate, '`uritemplate` must be installed for OpenAPI schema support.'
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model = getattr(getattr(self.view, 'queryset', None), 'model', None)
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parameters = []
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for variable in uritemplate.variables(path):
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description = ''
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if model is not None: # TODO: test this.
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# Attempt to infer a field description if possible.
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try:
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model_field = model._meta.get_field(variable)
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except Exception:
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model_field = None
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if model_field is not None and model_field.help_text:
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description = force_str(model_field.help_text)
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elif model_field is not None and model_field.primary_key:
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description = get_pk_description(model, model_field)
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parameter = {
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"name": variable,
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"in": "path",
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"required": True,
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"description": description,
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'schema': {
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'type': 'string', # TODO: integer, pattern, ...
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},
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}
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parameters.append(parameter)
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return parameters
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def _get_filter_parameters(self, path, method):
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if not self._allows_filters(path, method):
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return []
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parameters = []
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for filter_backend in self.view.filter_backends:
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parameters += filter_backend().get_schema_operation_parameters(self.view)
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return parameters
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def _allows_filters(self, path, method):
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"""
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Determine whether to include filter Fields in schema.
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Default implementation looks for ModelViewSet or GenericAPIView
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actions/methods that cause filtering on the default implementation.
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"""
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if getattr(self.view, 'filter_backends', None) is None:
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return False
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if hasattr(self.view, 'action'):
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return self.view.action in ["list", "retrieve", "update", "partial_update", "destroy"]
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return method.lower() in ["get", "put", "patch", "delete"]
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def _get_pagination_parameters(self, path, method):
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view = self.view
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if not is_list_view(path, method, view):
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return []
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paginator = self._get_paginator()
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if not paginator:
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return []
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return paginator.get_schema_operation_parameters(view)
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def _map_choicefield(self, field):
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choices = list(OrderedDict.fromkeys(field.choices)) # preserve order and remove duplicates
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if all(isinstance(choice, bool) for choice in choices):
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type = 'boolean'
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elif all(isinstance(choice, int) for choice in choices):
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type = 'integer'
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elif all(isinstance(choice, (int, float, Decimal)) for choice in choices): # `number` includes `integer`
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# Ref: https://tools.ietf.org/html/draft-wright-json-schema-validation-00#section-5.21
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type = 'number'
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elif all(isinstance(choice, str) for choice in choices):
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type = 'string'
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else:
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type = None
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mapping = {
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# The value of `enum` keyword MUST be an array and SHOULD be unique.
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# Ref: https://tools.ietf.org/html/draft-wright-json-schema-validation-00#section-5.20
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'enum': choices
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}
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# If We figured out `type` then and only then we should set it. It must be a string.
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# Ref: https://swagger.io/docs/specification/data-models/data-types/#mixed-type
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# It is optional but it can not be null.
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# Ref: https://tools.ietf.org/html/draft-wright-json-schema-validation-00#section-5.21
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if type:
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mapping['type'] = type
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return mapping
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def _map_field(self, field):
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# Nested Serializers, `many` or not.
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if isinstance(field, serializers.ListSerializer):
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return {
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'type': 'array',
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'items': self._map_serializer(field.child)
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}
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if isinstance(field, serializers.Serializer):
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data = self._map_serializer(field)
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data['type'] = 'object'
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return data
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# Related fields.
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if isinstance(field, serializers.ManyRelatedField):
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return {
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'type': 'array',
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'items': self._map_field(field.child_relation)
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}
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if isinstance(field, serializers.PrimaryKeyRelatedField):
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model = getattr(field.queryset, 'model', None)
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if model is not None:
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model_field = model._meta.pk
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if isinstance(model_field, models.AutoField):
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return {'type': 'integer'}
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# ChoiceFields (single and multiple).
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# Q:
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# - Is 'type' required?
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# - can we determine the TYPE of a choicefield?
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if isinstance(field, serializers.MultipleChoiceField):
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return {
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'type': 'array',
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'items': self._map_choicefield(field)
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}
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if isinstance(field, serializers.ChoiceField):
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return self._map_choicefield(field)
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# ListField.
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if isinstance(field, serializers.ListField):
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mapping = {
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'type': 'array',
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'items': {},
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}
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if not isinstance(field.child, _UnvalidatedField):
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mapping['items'] = self._map_field(field.child)
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return mapping
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# DateField and DateTimeField type is string
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if isinstance(field, serializers.DateField):
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return {
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'type': 'string',
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'format': 'date',
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}
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if isinstance(field, serializers.DateTimeField):
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return {
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'type': 'string',
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'format': 'date-time',
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}
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# "Formats such as "email", "uuid", and so on, MAY be used even though undefined by this specification."
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# see: https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md#data-types
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# see also: https://swagger.io/docs/specification/data-models/data-types/#string
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if isinstance(field, serializers.EmailField):
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return {
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'type': 'string',
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'format': 'email'
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}
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if isinstance(field, serializers.URLField):
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return {
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'type': 'string',
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'format': 'uri'
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}
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if isinstance(field, serializers.UUIDField):
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return {
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'type': 'string',
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'format': 'uuid'
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}
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if isinstance(field, serializers.IPAddressField):
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content = {
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'type': 'string',
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}
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if field.protocol != 'both':
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content['format'] = field.protocol
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return content
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if isinstance(field, serializers.DecimalField):
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if getattr(field, 'coerce_to_string', api_settings.COERCE_DECIMAL_TO_STRING):
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content = {
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'type': 'string',
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'format': 'decimal',
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}
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else:
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content = {
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'type': 'number'
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}
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if field.decimal_places:
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content['multipleOf'] = float('.' + (field.decimal_places - 1) * '0' + '1')
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if field.max_whole_digits:
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content['maximum'] = int(field.max_whole_digits * '9') + 1
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content['minimum'] = -content['maximum']
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self._map_min_max(field, content)
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return content
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if isinstance(field, serializers.FloatField):
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content = {
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'type': 'number',
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}
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self._map_min_max(field, content)
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return content
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if isinstance(field, serializers.IntegerField):
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content = {
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'type': 'integer'
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}
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self._map_min_max(field, content)
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# 2147483647 is max for int32_size, so we use int64 for format
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if int(content.get('maximum', 0)) > 2147483647 or int(content.get('minimum', 0)) > 2147483647:
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content['format'] = 'int64'
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return content
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if isinstance(field, serializers.FileField):
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return {
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'type': 'string',
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'format': 'binary'
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}
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# Simplest cases, default to 'string' type:
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FIELD_CLASS_SCHEMA_TYPE = {
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serializers.BooleanField: 'boolean',
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serializers.JSONField: 'object',
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serializers.DictField: 'object',
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serializers.HStoreField: 'object',
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}
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return {'type': FIELD_CLASS_SCHEMA_TYPE.get(field.__class__, 'string')}
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def _map_min_max(self, field, content):
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if field.max_value:
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content['maximum'] = field.max_value
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if field.min_value:
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content['minimum'] = field.min_value
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def _map_serializer(self, serializer):
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# Assuming we have a valid serializer instance.
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required = []
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properties = {}
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for field in serializer.fields.values():
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if isinstance(field, serializers.HiddenField):
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continue
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if field.required:
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required.append(field.field_name)
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schema = self._map_field(field)
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if field.read_only:
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schema['readOnly'] = True
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if field.write_only:
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schema['writeOnly'] = True
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if field.allow_null:
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schema['nullable'] = True
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if field.default is not None and field.default != empty and not callable(field.default):
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schema['default'] = field.default
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if field.help_text:
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schema['description'] = str(field.help_text)
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self._map_field_validators(field, schema)
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properties[field.field_name] = schema
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result = {
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'type': 'object',
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|
'properties': properties
|
|
}
|
|
if required:
|
|
result['required'] = required
|
|
|
|
return result
|
|
|
|
def _map_field_validators(self, field, schema):
|
|
"""
|
|
map field validators
|
|
"""
|
|
for v in field.validators:
|
|
# "Formats such as "email", "uuid", and so on, MAY be used even though undefined by this specification."
|
|
# https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md#data-types
|
|
if isinstance(v, EmailValidator):
|
|
schema['format'] = 'email'
|
|
if isinstance(v, URLValidator):
|
|
schema['format'] = 'uri'
|
|
if isinstance(v, RegexValidator):
|
|
schema['pattern'] = v.regex.pattern
|
|
elif isinstance(v, MaxLengthValidator):
|
|
attr_name = 'maxLength'
|
|
if isinstance(field, serializers.ListField):
|
|
attr_name = 'maxItems'
|
|
schema[attr_name] = v.limit_value
|
|
elif isinstance(v, MinLengthValidator):
|
|
attr_name = 'minLength'
|
|
if isinstance(field, serializers.ListField):
|
|
attr_name = 'minItems'
|
|
schema[attr_name] = v.limit_value
|
|
elif isinstance(v, MaxValueValidator):
|
|
schema['maximum'] = v.limit_value
|
|
elif isinstance(v, MinValueValidator):
|
|
schema['minimum'] = v.limit_value
|
|
elif isinstance(v, DecimalValidator) and \
|
|
not getattr(field, 'coerce_to_string', api_settings.COERCE_DECIMAL_TO_STRING):
|
|
if v.decimal_places:
|
|
schema['multipleOf'] = float('.' + (v.decimal_places - 1) * '0' + '1')
|
|
if v.max_digits:
|
|
digits = v.max_digits
|
|
if v.decimal_places is not None and v.decimal_places > 0:
|
|
digits -= v.decimal_places
|
|
schema['maximum'] = int(digits * '9') + 1
|
|
schema['minimum'] = -schema['maximum']
|
|
|
|
def _get_paginator(self):
|
|
pagination_class = getattr(self.view, 'pagination_class', None)
|
|
if pagination_class:
|
|
return pagination_class()
|
|
return None
|
|
|
|
def map_parsers(self, path, method):
|
|
return list(map(attrgetter('media_type'), self.view.parser_classes))
|
|
|
|
def map_renderers(self, path, method):
|
|
media_types = []
|
|
for renderer in self.view.renderer_classes:
|
|
# BrowsableAPIRenderer not relevant to OpenAPI spec
|
|
if renderer == renderers.BrowsableAPIRenderer:
|
|
continue
|
|
media_types.append(renderer.media_type)
|
|
return media_types
|
|
|
|
def _get_serializer(self, path, method):
|
|
view = self.view
|
|
|
|
if not hasattr(view, 'get_serializer'):
|
|
return None
|
|
|
|
try:
|
|
return view.get_serializer()
|
|
except exceptions.APIException:
|
|
warnings.warn('{}.get_serializer() raised an exception during '
|
|
'schema generation. Serializer fields will not be '
|
|
'generated for {} {}.'
|
|
.format(view.__class__.__name__, method, path))
|
|
return None
|
|
|
|
def _get_reference(self, serializer):
|
|
return {'$ref': '#/components/schemas/{}'.format(self.get_component_name(serializer))}
|
|
|
|
def _get_request_body(self, path, method):
|
|
if method not in ('PUT', 'PATCH', 'POST'):
|
|
return {}
|
|
|
|
self.request_media_types = self.map_parsers(path, method)
|
|
|
|
serializer = self._get_serializer(path, method)
|
|
|
|
if not isinstance(serializer, serializers.Serializer):
|
|
item_schema = {}
|
|
else:
|
|
item_schema = self._get_reference(serializer)
|
|
|
|
return {
|
|
'content': {
|
|
ct: {'schema': item_schema}
|
|
for ct in self.request_media_types
|
|
}
|
|
}
|
|
|
|
def _get_responses(self, path, method):
|
|
# TODO: Handle multiple codes and pagination classes.
|
|
if method == 'DELETE':
|
|
return {
|
|
'204': {
|
|
'description': ''
|
|
}
|
|
}
|
|
|
|
self.response_media_types = self.map_renderers(path, method)
|
|
|
|
serializer = self._get_serializer(path, method)
|
|
|
|
if not isinstance(serializer, serializers.Serializer):
|
|
item_schema = {}
|
|
else:
|
|
item_schema = self._get_reference(serializer)
|
|
|
|
if is_list_view(path, method, self.view):
|
|
response_schema = {
|
|
'type': 'array',
|
|
'items': item_schema,
|
|
}
|
|
paginator = self._get_paginator()
|
|
if paginator:
|
|
response_schema = paginator.get_paginated_response_schema(response_schema)
|
|
else:
|
|
response_schema = item_schema
|
|
status_code = '201' if method == 'POST' else '200'
|
|
return {
|
|
status_code: {
|
|
'content': {
|
|
ct: {'schema': response_schema}
|
|
for ct in self.response_media_types
|
|
},
|
|
# description is a mandatory property,
|
|
# https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md#responseObject
|
|
# TODO: put something meaningful into it
|
|
'description': ""
|
|
}
|
|
}
|
|
|
|
def get_tags(self, path, method):
|
|
# If user have specified tags, use them.
|
|
if self._tags:
|
|
return self._tags
|
|
|
|
# First element of a specific path could be valid tag. This is a fallback solution.
|
|
# PUT, PATCH, GET(Retrieve), DELETE: /user_profile/{id}/ tags = [user-profile]
|
|
# POST, GET(List): /user_profile/ tags = [user-profile]
|
|
if path.startswith('/'):
|
|
path = path[1:]
|
|
|
|
return [path.split('/')[0].replace('_', '-')]
|