mirror of
https://github.com/encode/django-rest-framework.git
synced 2024-09-21 11:29:01 +03:00
717 lines
24 KiB
Python
717 lines
24 KiB
Python
import re
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from collections import OrderedDict
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from importlib import import_module
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from django.conf import settings
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from django.contrib.admindocs.views import simplify_regex
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from django.core.exceptions import PermissionDenied
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from django.db import models
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from django.http import Http404
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from django.utils import six
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from django.utils.encoding import force_text, smart_text
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from django.utils.translation import ugettext_lazy as _
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from rest_framework import exceptions, renderers, serializers
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from rest_framework.compat import (
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RegexURLPattern, RegexURLResolver, coreapi, coreschema, uritemplate,
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urlparse
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)
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from rest_framework.request import clone_request
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from rest_framework.response import Response
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from rest_framework.settings import api_settings
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from rest_framework.utils import formatting
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from rest_framework.utils.model_meta import _get_pk
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from rest_framework.views import APIView
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header_regex = re.compile('^[a-zA-Z][0-9A-Za-z_]*:')
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def field_to_schema(field):
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title = force_text(field.label) if field.label else ''
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description = force_text(field.help_text) if field.help_text else ''
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if isinstance(field, serializers.ListSerializer):
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child_schema = field_to_schema(field.child)
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return coreschema.Array(
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items=child_schema,
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title=title,
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description=description
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)
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elif isinstance(field, serializers.Serializer):
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return coreschema.Object(
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properties=OrderedDict([
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(key, field_to_schema(value))
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for key, value
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in field.fields.items()
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]),
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title=title,
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description=description
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)
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elif isinstance(field, serializers.ManyRelatedField):
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return coreschema.Array(
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items=coreschema.String(),
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title=title,
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description=description
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)
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elif isinstance(field, serializers.RelatedField):
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return coreschema.String(title=title, description=description)
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elif isinstance(field, serializers.MultipleChoiceField):
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return coreschema.Array(
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items=coreschema.Enum(enum=list(field.choices.keys())),
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title=title,
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description=description
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)
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elif isinstance(field, serializers.ChoiceField):
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return coreschema.Enum(
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enum=list(field.choices.keys()),
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title=title,
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description=description
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)
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elif isinstance(field, serializers.BooleanField):
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return coreschema.Boolean(title=title, description=description)
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elif isinstance(field, (serializers.DecimalField, serializers.FloatField)):
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return coreschema.Number(title=title, description=description)
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elif isinstance(field, serializers.IntegerField):
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return coreschema.Integer(title=title, description=description)
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if field.style.get('base_template') == 'textarea.html':
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return coreschema.String(
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title=title,
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description=description,
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format='textarea'
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)
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return coreschema.String(title=title, description=description)
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def common_path(paths):
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split_paths = [path.strip('/').split('/') for path in paths]
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s1 = min(split_paths)
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s2 = max(split_paths)
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common = s1
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for i, c in enumerate(s1):
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if c != s2[i]:
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common = s1[:i]
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break
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return '/' + '/'.join(common)
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def get_pk_name(model):
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meta = model._meta.concrete_model._meta
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return _get_pk(meta).name
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def is_api_view(callback):
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"""
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Return `True` if the given view callback is a REST framework view/viewset.
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"""
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cls = getattr(callback, 'cls', None)
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return (cls is not None) and issubclass(cls, APIView)
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def insert_into(target, keys, value):
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"""
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Nested dictionary insertion.
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>>> example = {}
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>>> insert_into(example, ['a', 'b', 'c'], 123)
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>>> example
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{'a': {'b': {'c': 123}}}
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"""
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for key in keys[:-1]:
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if key not in target:
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target[key] = {}
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target = target[key]
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target[keys[-1]] = value
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def is_custom_action(action):
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return action not in set([
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'retrieve', 'list', 'create', 'update', 'partial_update', 'destroy'
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])
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def is_list_view(path, method, view):
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"""
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Return True if the given path/method appears to represent a list view.
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"""
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if hasattr(view, 'action'):
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# Viewsets have an explicitly defined action, which we can inspect.
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return view.action == 'list'
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if method.lower() != 'get':
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return False
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path_components = path.strip('/').split('/')
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if path_components and '{' in path_components[-1]:
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return False
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return True
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def endpoint_ordering(endpoint):
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path, method, callback = endpoint
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method_priority = {
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'GET': 0,
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'POST': 1,
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'PUT': 2,
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'PATCH': 3,
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'DELETE': 4
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}.get(method, 5)
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return (path, method_priority)
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def get_pk_description(model, model_field):
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if isinstance(model_field, models.AutoField):
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value_type = _('unique integer value')
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elif isinstance(model_field, models.UUIDField):
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value_type = _('UUID string')
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else:
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value_type = _('unique value')
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return _('A {value_type} identifying this {name}.').format(
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value_type=value_type,
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name=model._meta.verbose_name,
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)
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class EndpointInspector(object):
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"""
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A class to determine the available API endpoints that a project exposes.
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"""
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def __init__(self, patterns=None, urlconf=None):
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if patterns is None:
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if urlconf is None:
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# Use the default Django URL conf
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urlconf = settings.ROOT_URLCONF
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# Load the given URLconf module
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if isinstance(urlconf, six.string_types):
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urls = import_module(urlconf)
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else:
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urls = urlconf
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patterns = urls.urlpatterns
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self.patterns = patterns
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def get_api_endpoints(self, patterns=None, prefix=''):
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"""
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Return a list of all available API endpoints by inspecting the URL conf.
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"""
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if patterns is None:
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patterns = self.patterns
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api_endpoints = []
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for pattern in patterns:
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path_regex = prefix + pattern.regex.pattern
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if isinstance(pattern, RegexURLPattern):
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path = self.get_path_from_regex(path_regex)
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callback = pattern.callback
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if self.should_include_endpoint(path, callback):
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for method in self.get_allowed_methods(callback):
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endpoint = (path, method, callback)
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api_endpoints.append(endpoint)
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elif isinstance(pattern, RegexURLResolver):
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nested_endpoints = self.get_api_endpoints(
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patterns=pattern.url_patterns,
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prefix=path_regex
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)
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api_endpoints.extend(nested_endpoints)
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api_endpoints = sorted(api_endpoints, key=endpoint_ordering)
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return api_endpoints
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def get_path_from_regex(self, path_regex):
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"""
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Given a URL conf regex, return a URI template string.
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"""
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path = simplify_regex(path_regex)
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path = path.replace('<', '{').replace('>', '}')
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return path
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def should_include_endpoint(self, path, callback):
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"""
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Return `True` if the given endpoint should be included.
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"""
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if not is_api_view(callback):
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return False # Ignore anything except REST framework views.
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if path.endswith('.{format}') or path.endswith('.{format}/'):
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return False # Ignore .json style URLs.
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return True
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def get_allowed_methods(self, callback):
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"""
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Return a list of the valid HTTP methods for this endpoint.
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"""
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if hasattr(callback, 'actions'):
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actions = set(callback.actions.keys())
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http_method_names = set(callback.cls().http_method_names)
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return [method.upper() for method in actions & http_method_names]
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return [
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method for method in
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callback.cls().allowed_methods if method not in ('OPTIONS', 'HEAD')
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]
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class SchemaGenerator(object):
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# Map HTTP methods onto actions.
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default_mapping = {
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'get': 'retrieve',
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'post': 'create',
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'put': 'update',
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'patch': 'partial_update',
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'delete': 'destroy',
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}
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endpoint_inspector_cls = EndpointInspector
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# Map the method names we use for viewset actions onto external schema names.
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# These give us names that are more suitable for the external representation.
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# Set by 'SCHEMA_COERCE_METHOD_NAMES'.
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coerce_method_names = None
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# 'pk' isn't great as an externally exposed name for an identifier,
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# so by default we prefer to use the actual model field name for schemas.
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# Set by 'SCHEMA_COERCE_PATH_PK'.
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coerce_path_pk = None
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def __init__(self, title=None, url=None, description=None, patterns=None, urlconf=None):
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assert coreapi, '`coreapi` must be installed for schema support.'
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assert coreschema, '`coreschema` must be installed for schema support.'
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if url and not url.endswith('/'):
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url += '/'
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self.coerce_method_names = api_settings.SCHEMA_COERCE_METHOD_NAMES
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self.coerce_path_pk = api_settings.SCHEMA_COERCE_PATH_PK
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self.patterns = patterns
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self.urlconf = urlconf
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self.title = title
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self.description = description
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self.url = url
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self.endpoints = None
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def get_schema(self, request=None, public=False):
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"""
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Generate a `coreapi.Document` representing the API schema.
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"""
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if self.endpoints is None:
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inspector = self.endpoint_inspector_cls(self.patterns, self.urlconf)
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self.endpoints = inspector.get_api_endpoints()
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links = self.get_links(None if public else request)
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if not links:
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return None
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url = self.url
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if not url and request is not None:
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url = request.build_absolute_uri()
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return coreapi.Document(
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title=self.title, description=self.description,
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url=url, content=links
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)
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def get_links(self, request=None):
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"""
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Return a dictionary containing all the links that should be
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included in the API schema.
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"""
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links = OrderedDict()
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# Generate (path, method, view) given (path, method, callback).
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paths = []
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view_endpoints = []
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for path, method, callback in self.endpoints:
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view = self.create_view(callback, method, request)
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if getattr(view, 'exclude_from_schema', False):
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continue
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path = self.coerce_path(path, method, view)
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paths.append(path)
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view_endpoints.append((path, method, view))
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# Only generate the path prefix for paths that will be included
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if not paths:
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return None
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prefix = self.determine_path_prefix(paths)
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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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link = self.get_link(path, method, view)
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subpath = path[len(prefix):]
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keys = self.get_keys(subpath, method, view)
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insert_into(links, keys, link)
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return links
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# Methods used when we generate a view instance from the raw callback...
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def determine_path_prefix(self, paths):
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"""
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Given a list of all paths, return the common prefix which should be
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discounted when generating a schema structure.
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This will be the longest common string that does not include that last
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component of the URL, or the last component before a path parameter.
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For example:
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/api/v1/users/
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/api/v1/users/{pk}/
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The path prefix is '/api/v1/'
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"""
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prefixes = []
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for path in paths:
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components = path.strip('/').split('/')
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initial_components = []
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for component in components:
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if '{' in component:
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break
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initial_components.append(component)
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prefix = '/'.join(initial_components[:-1])
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if not prefix:
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# We can just break early in the case that there's at least
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# one URL that doesn't have a path prefix.
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return '/'
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prefixes.append('/' + prefix + '/')
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return common_path(prefixes)
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def create_view(self, callback, method, request=None):
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"""
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Given a callback, return an actual view instance.
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"""
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view = callback.cls()
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for attr, val in getattr(callback, 'initkwargs', {}).items():
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setattr(view, attr, val)
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view.args = ()
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view.kwargs = {}
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view.format_kwarg = None
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view.request = None
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view.action_map = getattr(callback, 'actions', None)
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actions = getattr(callback, 'actions', None)
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if actions is not None:
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if method == 'OPTIONS':
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view.action = 'metadata'
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else:
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view.action = actions.get(method.lower())
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if request is not None:
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view.request = clone_request(request, method)
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return view
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def has_view_permissions(self, path, method, view):
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"""
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Return `True` if the incoming request has the correct view permissions.
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"""
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if view.request is None:
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return True
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try:
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view.check_permissions(view.request)
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except (exceptions.APIException, Http404, PermissionDenied):
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return False
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return True
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def coerce_path(self, path, method, view):
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"""
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Coerce {pk} path arguments into the name of the model field,
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where possible. This is cleaner for an external representation.
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(Ie. "this is an identifier", not "this is a database primary key")
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"""
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if not self.coerce_path_pk or '{pk}' not in path:
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return path
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model = getattr(getattr(view, 'queryset', None), 'model', None)
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if model:
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field_name = get_pk_name(model)
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else:
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field_name = 'id'
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return path.replace('{pk}', '{%s}' % field_name)
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# Methods for generating each individual `Link` instance...
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def get_link(self, path, method, view):
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"""
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Return a `coreapi.Link` instance for the given endpoint.
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"""
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fields = self.get_path_fields(path, method, view)
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fields += self.get_serializer_fields(path, method, view)
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fields += self.get_pagination_fields(path, method, view)
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fields += self.get_filter_fields(path, method, view)
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if fields and any([field.location in ('form', 'body') for field in fields]):
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encoding = self.get_encoding(path, method, view)
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else:
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encoding = None
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description = self.get_description(path, method, view)
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if self.url and path.startswith('/'):
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path = path[1:]
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return coreapi.Link(
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url=urlparse.urljoin(self.url, path),
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action=method.lower(),
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encoding=encoding,
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fields=fields,
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description=description
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)
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def get_description(self, path, method, view):
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"""
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Determine a link description.
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This will be based on the method docstring if one exists,
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or else the class docstring.
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"""
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method_name = getattr(view, 'action', method.lower())
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method_docstring = getattr(view, method_name, None).__doc__
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if method_docstring:
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# An explicit docstring on the method or action.
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return formatting.dedent(smart_text(method_docstring))
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description = view.get_view_description()
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lines = [line.strip() for line in description.splitlines()]
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current_section = ''
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sections = {'': ''}
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for line in lines:
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if header_regex.match(line):
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current_section, seperator, lead = line.partition(':')
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sections[current_section] = lead.strip()
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else:
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sections[current_section] += '\n' + line
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header = getattr(view, 'action', method.lower())
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if header in sections:
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return sections[header].strip()
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if header in self.coerce_method_names:
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if self.coerce_method_names[header] in sections:
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return sections[self.coerce_method_names[header]].strip()
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return sections[''].strip()
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def get_encoding(self, path, method, view):
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"""
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Return the 'encoding' parameter to use for a given endpoint.
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"""
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# Core API supports the following request encodings over HTTP...
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supported_media_types = set((
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'application/json',
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'application/x-www-form-urlencoded',
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'multipart/form-data',
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))
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parser_classes = getattr(view, 'parser_classes', [])
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for parser_class in parser_classes:
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media_type = getattr(parser_class, 'media_type', None)
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if media_type in supported_media_types:
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return media_type
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# Raw binary uploads are supported with "application/octet-stream"
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if media_type == '*/*':
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return 'application/octet-stream'
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return None
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def get_path_fields(self, path, method, view):
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"""
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Return a list of `coreapi.Field` instances corresponding to any
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templated path variables.
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"""
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model = getattr(getattr(view, 'queryset', None), 'model', None)
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fields = []
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for variable in uritemplate.variables(path):
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title = ''
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description = ''
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schema_cls = coreschema.String
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kwargs = {}
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if model is not None:
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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:
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model_field = None
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if model_field is not None and model_field.verbose_name:
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title = force_text(model_field.verbose_name)
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if model_field is not None and model_field.help_text:
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|
description = force_text(model_field.help_text)
|
|
elif model_field is not None and model_field.primary_key:
|
|
description = get_pk_description(model, model_field)
|
|
|
|
if hasattr(view, 'lookup_value_regex') and view.lookup_field == variable:
|
|
kwargs['pattern'] = view.lookup_value_regex
|
|
elif isinstance(model_field, models.AutoField):
|
|
schema_cls = coreschema.Integer
|
|
|
|
field = coreapi.Field(
|
|
name=variable,
|
|
location='path',
|
|
required=True,
|
|
schema=schema_cls(title=title, description=description, **kwargs)
|
|
)
|
|
fields.append(field)
|
|
|
|
return fields
|
|
|
|
def get_serializer_fields(self, path, method, view):
|
|
"""
|
|
Return a list of `coreapi.Field` instances corresponding to any
|
|
request body input, as determined by the serializer class.
|
|
"""
|
|
if method not in ('PUT', 'PATCH', 'POST'):
|
|
return []
|
|
|
|
if not hasattr(view, 'get_serializer'):
|
|
return []
|
|
|
|
serializer = view.get_serializer()
|
|
|
|
if isinstance(serializer, serializers.ListSerializer):
|
|
return [
|
|
coreapi.Field(
|
|
name='data',
|
|
location='body',
|
|
required=True,
|
|
schema=coreschema.Array()
|
|
)
|
|
]
|
|
|
|
if not isinstance(serializer, serializers.Serializer):
|
|
return []
|
|
|
|
fields = []
|
|
for field in serializer.fields.values():
|
|
if field.read_only or isinstance(field, serializers.HiddenField):
|
|
continue
|
|
|
|
required = field.required and method != 'PATCH'
|
|
field = coreapi.Field(
|
|
name=field.field_name,
|
|
location='form',
|
|
required=required,
|
|
schema=field_to_schema(field)
|
|
)
|
|
fields.append(field)
|
|
|
|
return fields
|
|
|
|
def get_pagination_fields(self, path, method, view):
|
|
if not is_list_view(path, method, view):
|
|
return []
|
|
|
|
pagination = getattr(view, 'pagination_class', None)
|
|
if not pagination or not pagination.page_size:
|
|
return []
|
|
|
|
paginator = view.pagination_class()
|
|
return paginator.get_schema_fields(view)
|
|
|
|
def get_filter_fields(self, path, method, view):
|
|
if not is_list_view(path, method, view):
|
|
return []
|
|
|
|
if not getattr(view, 'filter_backends', None):
|
|
return []
|
|
|
|
fields = []
|
|
for filter_backend in view.filter_backends:
|
|
fields += filter_backend().get_schema_fields(view)
|
|
return fields
|
|
|
|
# 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
|
|
the schema document.
|
|
|
|
/users/ ("users", "list"), ("users", "create")
|
|
/users/{pk}/ ("users", "read"), ("users", "update"), ("users", "delete")
|
|
/users/enabled/ ("users", "enabled") # custom viewset list action
|
|
/users/{pk}/star/ ("users", "star") # custom viewset detail action
|
|
/users/{pk}/groups/ ("users", "groups", "list"), ("users", "groups", "create")
|
|
/users/{pk}/groups/{pk}/ ("users", "groups", "read"), ("users", "groups", "update"), ("users", "groups", "delete")
|
|
"""
|
|
if hasattr(view, 'action'):
|
|
# Viewsets have explicitly named actions.
|
|
action = view.action
|
|
else:
|
|
# Views have no associated action, so we determine one from the method.
|
|
if is_list_view(subpath, method, view):
|
|
action = 'list'
|
|
else:
|
|
action = self.default_mapping[method.lower()]
|
|
|
|
named_path_components = [
|
|
component for component
|
|
in subpath.strip('/').split('/')
|
|
if '{' not in component
|
|
]
|
|
|
|
if is_custom_action(action):
|
|
# Custom action, eg "/users/{pk}/activate/", "/users/active/"
|
|
if len(view.action_map) > 1:
|
|
action = self.default_mapping[method.lower()]
|
|
if action in self.coerce_method_names:
|
|
action = self.coerce_method_names[action]
|
|
return named_path_components + [action]
|
|
else:
|
|
return named_path_components[:-1] + [action]
|
|
|
|
if action in self.coerce_method_names:
|
|
action = self.coerce_method_names[action]
|
|
|
|
# Default action, eg "/users/", "/users/{pk}/"
|
|
return named_path_components + [action]
|
|
|
|
|
|
class SchemaView(APIView):
|
|
_ignore_model_permissions = True
|
|
exclude_from_schema = True
|
|
renderer_classes = None
|
|
schema_generator = None
|
|
public = False
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super(SchemaView, self).__init__(*args, **kwargs)
|
|
if self.renderer_classes is None:
|
|
if renderers.BrowsableAPIRenderer in api_settings.DEFAULT_RENDERER_CLASSES:
|
|
self.renderer_classes = [
|
|
renderers.CoreJSONRenderer,
|
|
renderers.BrowsableAPIRenderer,
|
|
]
|
|
else:
|
|
self.renderer_classes = [renderers.CoreJSONRenderer]
|
|
|
|
def get(self, request, *args, **kwargs):
|
|
schema = self.schema_generator.get_schema(request, self.public)
|
|
if schema is None:
|
|
raise exceptions.PermissionDenied()
|
|
return Response(schema)
|
|
|
|
|
|
def get_schema_view(
|
|
title=None,
|
|
url=None,
|
|
description=None,
|
|
urlconf=None,
|
|
renderer_classes=None,
|
|
public=False,
|
|
generator_class=SchemaGenerator,
|
|
):
|
|
"""
|
|
Return a schema view.
|
|
"""
|
|
generator = generator_class(title=title, url=url, description=description, urlconf=urlconf)
|
|
return SchemaView.as_view(
|
|
renderer_classes=renderer_classes,
|
|
schema_generator=generator,
|
|
public=public,
|
|
)
|