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import logging
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import os
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from django.contrib.auth import get_user_model
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from django.core.exceptions import ImproperlyConfigured
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from django.core.management.base import BaseCommand
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from django.utils.module_loading import import_string
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from rest_framework.settings import api_settings
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from rest_framework.test import APIRequestFactory, force_authenticate
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from rest_framework.views import APIView
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from ... import openapi
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from ...app_settings import swagger_settings
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from ...codecs import OpenAPICodecJson, OpenAPICodecYaml
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class Command(BaseCommand):
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help = 'Write the Swagger schema to disk in JSON or YAML format.'
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def add_arguments(self, parser):
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parser.add_argument(
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'output_file', metavar='output-file',
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nargs='?',
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default='-',
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type=str,
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help='Output path for generated swagger document, or "-" for stdout.'
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)
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parser.add_argument(
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'-o', '--overwrite',
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default=False, action='store_true',
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help='Overwrite the output file if it already exists. '
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'Default behavior is to stop if the output file exists.'
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)
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parser.add_argument(
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'-f', '--format', dest='format',
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default='', choices=['json', 'yaml'],
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type=str,
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help='Output format. If not given, it is guessed from the output file extension and defaults to json.'
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)
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parser.add_argument(
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'-u', '--url', dest='api_url',
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default='',
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type=str,
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help='Base API URL - sets the host and scheme attributes of the generated document.'
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)
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parser.add_argument(
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'-m', '--mock-request', dest='mock',
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default=False, action='store_true',
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help='Use a mock request when generating the swagger schema. This is useful if your views or serializers '
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'depend on context from a request in order to function.'
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)
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parser.add_argument(
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'--api-version', dest='api_version',
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type=str,
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help='Version to use to generate schema. This option implies --mock-request.'
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)
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parser.add_argument(
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'--user', dest='user',
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help='Username of an existing user to use for mocked authentication. This option implies --mock-request.'
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)
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parser.add_argument(
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'-p', '--private',
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default=False, action="store_true",
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help='Hides endpoints not accessible to the target user. If --user is not given, only shows endpoints that '
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'are accessible to unauthenticated users.\n'
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'This has the same effect as passing public=False to get_schema_view() or '
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'OpenAPISchemaGenerator.get_schema().\n'
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'This option implies --mock-request.'
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)
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parser.add_argument(
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'-g', '--generator-class', dest='generator_class_name',
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default='',
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help='Import string pointing to an OpenAPISchemaGenerator subclass to use for schema generation.'
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)
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def write_schema(self, schema, stream, format):
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if format == 'json':
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codec = OpenAPICodecJson(validators=[], pretty=True)
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swagger_json = codec.encode(schema).decode('utf-8')
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stream.write(swagger_json)
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elif format == 'yaml':
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codec = OpenAPICodecYaml(validators=[])
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swagger_yaml = codec.encode(schema).decode('utf-8')
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# YAML is already pretty!
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stream.write(swagger_yaml)
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else: # pragma: no cover
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raise ValueError("unknown format %s" % format)
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def get_mock_request(self, url, format, user=None):
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factory = APIRequestFactory()
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request = factory.get(url + '/swagger.' + format)
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if user is not None:
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force_authenticate(request, user=user)
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request = APIView().initialize_request(request)
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return request
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def get_schema_generator(self, generator_class_name, api_info, api_version, api_url):
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generator_class = swagger_settings.DEFAULT_GENERATOR_CLASS
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if generator_class_name:
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generator_class = import_string(generator_class_name)
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return generator_class(
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info=api_info,
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version=api_version,
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url=api_url,
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)
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def get_schema(self, generator, request, public):
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return generator.get_schema(request=request, public=public)
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def handle(self, output_file, overwrite, format, api_url, mock, api_version, user, private, generator_class_name,
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*args, **kwargs):
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# disable logs of WARNING and below
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logging.disable(logging.WARNING)
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info = getattr(swagger_settings, 'DEFAULT_INFO', None)
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if not isinstance(info, openapi.Info):
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raise ImproperlyConfigured(
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'settings.SWAGGER_SETTINGS["DEFAULT_INFO"] should be an '
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'import string pointing to an openapi.Info object'
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)
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if not format:
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if os.path.splitext(output_file)[1] in ('.yml', '.yaml'):
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format = 'yaml'
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format = format or 'json'
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api_url = api_url or swagger_settings.DEFAULT_API_URL
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if user:
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# Only call get_user_model if --user was passed in order to
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# avoid crashing if auth is not configured in the project
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user = get_user_model().objects.get(**{get_user_model().USERNAME_FIELD: user})
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mock = mock or private or (user is not None) or (api_version is not None)
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if mock and not api_url:
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raise ImproperlyConfigured(
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'--mock-request requires an API url; either provide '
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'the --url argument or set the DEFAULT_API_URL setting'
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)
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request = None
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if mock:
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request = self.get_mock_request(api_url, format, user)
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api_version = api_version or api_settings.DEFAULT_VERSION
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if request and api_version:
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request.version = api_version
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generator = self.get_schema_generator(generator_class_name, info, api_version, api_url)
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schema = self.get_schema(generator, request, not private)
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if output_file == '-':
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self.write_schema(schema, self.stdout, format)
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else:
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flags = "w" if overwrite else "x"
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with open(output_file, flags) as stream:
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self.write_schema(schema, stream, format)
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