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axnsan12 / drf-yasg

Automated generation of real Swagger/OpenAPI 2.0 schemas from Django REST Framework code.
https://drf-yasg.readthedocs.io/en/stable/
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coreapi django django-rest-framework django-rest-swagger documentation-generator openapi openapi-specification redoc rest rest-api swagger swagger-codegen swagger-ui

readme

.. role:: python(code) :language: python

######################################## drf-yasg - Yet another Swagger generator ########################################

|actions| |nbsp| |codecov| |nbsp| |rtd-badge| |nbsp| |pypi-version| |nbsp| |gitter|

Generate real Swagger/OpenAPI 2.0 specifications from a Django Rest Framework API.

Compatible with

Only the latest patch version of each major.minor series of Python, Django and Django REST Framework is supported.

Only the latest version of drf-yasg is supported. Support of old versions is dropped immediately with the release of a new version. Please do not create issues before upgrading to the latest release available at the time. Regression reports are accepted and will be resolved with a new release as quickly as possible. Removed features will usually go through a deprecation cycle of a few minor releases.

Resources:

|heroku-button|

OpenAPI 3.0 note

If you are looking to add Swagger/OpenAPI support to a new project you might want to take a look at drf-spectacular <https://github.com/tfranzel/drf-spectacular>_, which is an actively maintained new library that shares most of the goals of this project, while working with OpenAPI 3.0 schemas.

OpenAPI 3.0 provides a lot more flexibility than 2.0 in the types of API that can be described. drf-yasg is unlikely to soon, if ever, get support for OpenAPI 3.0.

Features

.. figure:: https://raw.githubusercontent.com/axnsan12/drf-yasg/1.0.2/screenshots/redoc-nested-response.png :width: 100% :figwidth: image :alt: redoc screenshot

Fully nested request and response schemas.

.. figure:: https://raw.githubusercontent.com/axnsan12/drf-yasg/1.0.2/screenshots/swagger-ui-list.png :width: 100% :figwidth: image :alt: swagger-ui screenshot

Choose between redoc and swagger-ui.

.. figure:: https://raw.githubusercontent.com/axnsan12/drf-yasg/1.0.2/screenshots/swagger-ui-models.png :width: 100% :figwidth: image :alt: model definitions screenshot

Real Model definitions.

Table of contents

.. contents:: :depth: 4

Usage

  1. Installation

The preferred installation method is directly from pypi:

.. code:: console

pip install --upgrade drf-yasg

Additionally, if you want to use the built-in validation mechanisms (see 4. Validation_), you need to install some extra requirements:

.. code:: console

pip install --upgrade drf-yasg[validation]

.. _readme-quickstart:

  1. Quickstart

In settings.py:

.. code:: python

INSTALLED_APPS = [ ... 'django.contrib.staticfiles', # required for serving swagger ui's css/js files 'drf_yasg', ... ]

In urls.py:

.. code:: python

... from django.urls import re_path from rest_framework import permissions from drf_yasg.views import get_schema_view from drf_yasg import openapi

...

schema_view = get_schema_view( openapi.Info( title="Snippets API", default_version='v1', description="Test description", terms_of_service="https://www.google.com/policies/terms/", contact=openapi.Contact(email="contact@snippets.local"), license=openapi.License(name="BSD License"), ), public=True, permission_classes=(permissions.AllowAny,), )

urlpatterns = [ path('swagger/', schema_view.without_ui(cache_timeout=0), name='schema-json'), path('swagger/', schema_view.with_ui('swagger', cache_timeout=0), name='schema-swagger-ui'), path('redoc/', schema_view.with_ui('redoc', cache_timeout=0), name='schema-redoc'), ... ]

This exposes 4 endpoints:

  1. Configuration

a. get_schema_view parameters

b. SchemaView options

All of the first 3 methods take two optional arguments, cache_timeout and cache_kwargs; if present, these are passed on to Django’s :python:cached_page decorator in order to enable caching on the resulting view. See 3. Caching_.

c. SWAGGER_SETTINGS and REDOC_SETTINGS

Additionally, you can include some more settings in your settings.py file. See https://drf-yasg.readthedocs.io/en/stable/settings.html for details.

  1. Caching

Since the schema does not usually change during the lifetime of the django process, there is out of the box support for caching the schema view in-memory, with some sane defaults:

  1. Validation

Given the numerous methods to manually customize the generated schema, it makes sense to validate the result to ensure it still conforms to OpenAPI 2.0. To this end, validation is provided at the generation point using python swagger libraries, and can be activated by passing :python:validators=['ssv'] to get_schema_view; if the generated schema is not valid, a :python:SwaggerValidationError is raised by the handling codec.

Warning: This internal validation can slow down your server. Caching can mitigate the speed impact of validation.

The provided validation will catch syntactic errors, but more subtle violations of the spec might slip by them. To ensure compatibility with code generation tools, it is recommended to also employ one or more of the following methods:

swagger-ui validation badge

Online ^^^^^^

If your schema is publicly accessible, swagger-ui will automatically validate it against the official swagger online validator and display the result in the bottom-right validation badge.

Offline ^^^^^^^

If your schema is not accessible from the internet, you can run a local copy of swagger-validator <https://hub.docker.com/r/swaggerapi/swagger-validator/>_ and set the VALIDATOR_URL accordingly:

.. code:: python

SWAGGER_SETTINGS = {
    ...
    'VALIDATOR_URL': 'http://localhost:8189',
    ...
}

.. code:: console

$ docker run --name swagger-validator -d -p 8189:8080 --add-host test.local:10.0.75.1 swaggerapi/swagger-validator
84dabd52ba967c32ae6b660934fa6a429ca6bc9e594d56e822a858b57039c8a2
$ curl http://localhost:8189/debug?url=http://test.local:8002/swagger/?format=openapi
{}

Using swagger-cli

https://www.npmjs.com/package/swagger-cli

.. code:: console

$ npm install -g swagger-cli
[...]
$ swagger-cli validate http://test.local:8002/swagger.yaml
http://test.local:8002/swagger.yaml is valid

Manually on editor.swagger.io <https://editor.swagger.io/>__

Importing the generated spec into https://editor.swagger.io/ will automatically trigger validation on it. This method is currently the only way to get both syntactic and semantic validation on your specification. The other validators only provide JSON schema-level validation, but miss things like duplicate operation names, improper content types, etc

  1. Code generation

You can use the specification outputted by this library together with swagger-codegen <https://github.com/swagger-api/swagger-codegen>_ to generate client code in your language of choice:

.. code:: console

$ docker run --rm -v ${PWD}:/local swaggerapi/swagger-codegen-cli generate -i /local/tests/reference.yaml -l javascript -o /local/.codegen/js

See the GitHub page linked above for more details.

.. _readme-testproj:

  1. Example project

For additional usage examples, you can take a look at the test project in the testproj directory:

.. code:: console

$ git clone https://github.com/axnsan12/drf-yasg.git $ cd drf-yasg $ virtualenv venv $ source venv/bin/activate (venv) $ cd testproj (venv) $ python -m pip install --upgrade pip setuptools (venv) $ pip install --upgrade -r requirements.txt (venv) $ python manage.py migrate (venv) $ python manage.py runserver (venv) $ firefox localhost:8000/swagger/

Third-party integrations

djangorestframework-camel-case

Integration with djangorestframework-camel-case <https://github.com/vbabiy/djangorestframework-camel-case>_ is provided out of the box - if you have djangorestframework-camel-case installed and your APIView uses CamelCaseJSONParser or CamelCaseJSONRenderer, all property names will be converted to camelCase by default.

djangorestframework-recursive

Integration with djangorestframework-recursive <https://github.com/heywbj/django-rest-framework-recursive>_ is provided out of the box - if you have djangorestframework-recursive installed.

.. |actions| image:: https://img.shields.io/github/actions/workflow/status/axnsan12/drf-yasg/review.yml?branch=master :target: https://github.com/axnsan12/drf-yasg/actions :alt: GitHub Workflow Status

.. |codecov| image:: https://img.shields.io/codecov/c/github/axnsan12/drf-yasg/master.svg :target: https://codecov.io/gh/axnsan12/drf-yasg :alt: Codecov

.. |pypi-version| image:: https://img.shields.io/pypi/v/drf-yasg.svg :target: https://pypi.org/project/drf-yasg/ :alt: PyPI

.. |gitter| image:: https://badges.gitter.im/drf-yasg.svg :target: https://app.gitter.im/#/room/#drf-yasg:gitter.im :alt: Gitter

.. |rtd-badge| image:: https://img.shields.io/readthedocs/drf-yasg.svg :target: https://drf-yasg.readthedocs.io/ :alt: ReadTheDocs

.. |heroku-button| image:: https://www.herokucdn.com/deploy/button.svg :target: https://heroku.com/deploy?template=https://github.com/axnsan12/drf-yasg :alt: Heroku deploy button

.. |nbsp| unicode:: 0xA0 :trim:

drf-extra-fields

Integration with drf-extra-fields <https://github.com/Hipo/drf-extra-fields>_ has a problem with Base64 fields. The drf-yasg will generate Base64 file or image fields as Readonly and not required. Here is a workaround code for display the Base64 fields correctly.

.. code:: python

class PDFBase64FileField(Base64FileField): ALLOWED_TYPES = ['pdf']

  class Meta:
      swagger_schema_fields = {
          'type': 'string',
          'title': 'File Content',
          'description': 'Content of the file base64 encoded',
          'read_only': False  # <-- FIX
      }

  def get_file_extension(self, filename, decoded_file):
      try:
          PyPDF2.PdfFileReader(io.BytesIO(decoded_file))
      except PyPDF2.utils.PdfReadError as e:
          logger.warning(e)
      else:
          return 'pdf'