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https://github.com/ashleysommer/sanic-cors

A Sanic extension for handling Cross Origin Resource Sharing (CORS), making cross-origin AJAX possible. Based on flask-cors by Cory Dolphin.
https://github.com/ashleysommer/sanic-cors

cors cross-origin-resource-sharing plugin python-3 python-3-5 python-3-6 sanic

Last synced: 10 days ago
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A Sanic extension for handling Cross Origin Resource Sharing (CORS), making cross-origin AJAX possible. Based on flask-cors by Cory Dolphin.

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README 

        
Sanic-CORS

==========



|Build Status| |Latest Version| |Supported Python versions|

|License|



A Sanic extension for handling Cross Origin Resource Sharing (CORS),

making cross-origin AJAX possible. Based on

`flask-cors `__ by Cory Dolphin.



This package has a simple philosophy, when you want to enable CORS, you

wish to enable it for all use cases on a domain. This means no mucking

around with different allowed headers, methods, etc. By default,

submission of cookies across domains is disabled due to the security

implications, please see the documentation for how to enable

credential'ed requests, and please make sure you add some sort of

`CSRF `__

protection before doing so!



**Sept 2022 Notice:**

If you are having unexpected results in Sanic v22.9+, upgrade to Sanic-CORS v2.2.0



**December 2021 Notice:**

If you need compatibility with Sanic v21.12+, upgrade to Sanic-CORS v2.0



**Sept 2021 Notice:**

Please upgrade to Sanic-CORS v1.0.1 if you need compatibility with Sanic v21.9,<21.12



Installation

------------



Install the extension with using pip, or easy\_install.



.. code:: bash



    $ pip install -U sanic-cors



Usage

-----



This package exposes a Sanic extension which by default enables CORS support on

all routes, for all origins and methods. It allows parameterization of all

CORS headers on a per-resource level. The package also contains a decorator,

for those who prefer this approach.



Simple Usage

~~~~~~~~~~~~



In the simplest case, initialize the Sanic-Cors extension with default

arguments in order to allow CORS for all domains on all routes.



.. code:: python



    from sanic import Sanic

    from sanic.response import text

    from sanic_cors import CORS, cross_origin



    app = Sanic(__name__)

    CORS(app)



    @app.route("/", methods=['GET', 'OPTIONS'])

    def hello_world(request):

      return text("Hello, cross-origin-world!")



Resource specific CORS

^^^^^^^^^^^^^^^^^^^^^^



Alternatively, you can specify CORS options on a resource and origin

level of granularity by passing a dictionary as the `resources` option,

mapping paths to a set of options.



.. code:: python



    app = Sanic(__name__)

    cors = CORS(app, resources={r"/api/*": {"origins": "*"}})



    @app.route("/api/v1/users", methods=['GET', 'OPTIONS'])

    def list_users(request):

      return text("user example")



Route specific CORS via decorator

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^



This extension also exposes a simple decorator to decorate sanic routes

with. Simply add ``@cross_origin(app)`` below a call to Sanic's

``@app.route(..)`` to allow CORS on a given route.



.. code:: python



    @app.route("/", methods=['GET', 'OPTIONS'])

    @cross_origin(app)

    def hello_world(request):

      return text("Hello, cross-origin-world!")



Sanic-Ext Usage

~~~~~~~~~~~~~~~



Sanic-CORS can use Sanic-Ext to load the plugin for you.

(But you need to make sure to disable the built-in sanic-ext CORS support too)



.. code:: python



    from sanic import Sanic

    from sanic.response import text

    from sanic_ext import Extend

    from sanic_cors.extension import CORS

    app = Sanic(__name__)

    CORS_OPTIONS = {"resources": r'/*', "origins": "*", "methods": ["GET", "POST", "HEAD", "OPTIONS"]}

    # Disable sanic-ext built-in CORS, and add the Sanic-CORS plugin

    Extend(app, extensions=[CORS], config={"CORS": False, "CORS_OPTIONS": CORS_OPTIONS})



    @app.route("/", methods=['GET', 'OPTIONS'])

    def hello_world(request):

      return text("Hello, cross-origin-world!")



Documentation

-------------



For a full list of options, please see the flask-cors

`documentation `__.



Preflight Requests

------------------

CORS requests have to send `pre-flight requests `_

via the options method, Sanic by default only allows the ``GET`` method, in order to

service your CORS requests you must specify ``OPTIONS`` in the methods argument to

your routes decorator.



Sanic-CORS includes an ``automatic_options`` configuration parameter to

allow the plugin handle the ``OPTIONS`` response automatically for you. This is enabled by default, but you

can turn it off if you wish to do your own ``OPTIONS`` response.



.. code:: python



    CORS(app, automatic_options=True)



    @app.delete('/api/auth')

    @auth.login_required

    async def auth_logout(request):

    auth.logout_user(request)

        return json(None, status=OK)



or with the app config key:



.. code:: python



    app = Sanic(__name__)

    app.config['CORS_AUTOMATIC_OPTIONS'] = True



    CORS(app)



    @app.delete('/api/auth')

    @auth.login_required

    async def auth_logout(request):

        auth.logout_user(request)

        return json(None, status=OK)



or directly on the route with the ``cross_origin`` decorator:



.. code:: python



    @app.route('/api/auth', methods={'DELETE','OPTIONS'})

    @auth.login_required

    @cross_origin(app, automatic_options=True)

    async def auth_logout(request):

        auth.logout_user(request)

        return json(None, status=OK)



Note: For the third example, you must use ``@route()``, rather than

``@delete()`` because you need to enable both ``DELETE`` and ``OPTIONS`` to

work on that route, even though the decorator is handling the ``OPTIONS``

response.



Tests

-----



A simple set of tests is included in ``test/``. To run, install nose,

and simply invoke ``nosetests`` or ``python setup.py test`` to exercise

the tests.



Contributing

------------



Questions, comments or improvements? Please create an issue on

`Github `__. I do my best to

include every contribution proposed in any way that I can.



Credits

-------



This Sanic extension is based upon the `Decorator for the HTTP Access

Control `__ written by Armin

Ronacher.



.. |Build Status| image:: https://api.travis-ci.org/ashleysommer/sanic-cors.svg?branch=master

   :target: https://travis-ci.org/ashleysommer/sanic-cors

.. |Latest Version| image:: https://img.shields.io/pypi/v/Sanic-Cors.svg

   :target: https://pypi.python.org/pypi/Sanic-Cors/

.. |Supported Python versions| image:: https://img.shields.io/pypi/pyversions/Sanic-Cors.svg

   :target: https://img.shields.io/pypi/pyversions/Sanic-Cors.svg

.. |License| image:: http://img.shields.io/:license-mit-blue.svg

   :target: https://pypi.python.org/pypi/Sanic-Cors/