Adding CORS headers to a particular resource

[gulfpearl]

How would I go about enabling CORS on a per resource basis. Thanks in advance for any pointers.

[guneysus]

There is hacky workaround this:

class PostResource(restless.tnd.TornadoResource):
    def is_authenticated(self):
        return True

    def create(self, *args, **kwargs):
        self.r_handler.add_header('Access-Control-Allow-Origin', '*')

Since I can not be able to add CORS header in __init__, __call__, __new__. I put header in each end point. I will be working on converting this workarounD to decorator like

    @cors(origin='*')
    def create(self, *args, **kwargs):
        ...

[guneysus]

#!/usr/bin/env python
# coding:utf-8


# noinspection SpellCheckingInspection
def cors(origins=['http://127.0.0.1:9001', 'http://localhost:9001', 'http://stackoverflow.com']):
    """
    Usage
    class RestlessResource(restless.tnd.TornadoResource):

        @api.extensions.cors(origins=['http://stackoverflow.com'])
        def list(self, *args, **kwargs):
            ...

    :param origins:
    :return:
    """
    def real_decorator(func):
        # Passing parameters to decorators
        # http://stackoverflow.com/a/5929165/1766716
        def wrapper(*args, **kwargs):
            self = args[0]

            if self.r_handler.request.headers.get('origin') in origins:
                # Thanks to http://stackoverflow.com/a/7454204/1766716
                self.r_handler.add_header('Access-Control-Allow-Origin', self.r_handler.request.headers['origin'])

            return func(*args, **kwargs)

        return wrapper

    return real_decorator

Usage

class RestlessResource(restless.tnd.TornadoResource):

    @api.extensions.cors(origins=['http://stackoverflow.com'])
    def list(self, *args, **kwargs):
        ...