add cors support

Author: tbarbugli

README.md

@@ -7,7 +7,7 @@ Tyron is a web app for events pushing.
 
 It is written in python and developed as a Flask application.
 
-** Gevent is required to run Tyron **
+**Gevent is required to run Tyron**
 
 The messaging backend utilises the redis pub/sub feature.
 

tyron/tyron.py

@@ -13,6 +13,8 @@
 import os
 import logging
 import redis
+from .utils import crossdomain
+
 
 monkey.patch_all()
 
@@ -82,6 +84,7 @@ def health():
     return 'OK'
 
 @application.route('/<channel>/', methods=('GET', 'POST', 'OPTIONS'))
+@crossdomain(origin='*')
 def subscribe(channel):
     timeout = application.config['LONGPOLLING_TIMEOUT']
     try:

tyron/utils.py

@@ -0,0 +1,51 @@
+from datetime import timedelta
+from flask import make_response, request, current_app
+from functools import update_wrapper
+
+"""
+A Flask crossdomain decorator written by Armin Ronacher
+
+http://flask.pocoo.org/snippets/56/
+
+"""
+
+def crossdomain(origin=None, methods=None, headers=None,
+                max_age=21600, attach_to_all=True,
+                automatic_options=True):
+    if methods is not None:
+        methods = ', '.join(sorted(x.upper() for x in methods))
+    if headers is not None and not isinstance(headers, basestring):
+        headers = ', '.join(x.upper() for x in headers)
+    if not isinstance(origin, basestring):
+        origin = ', '.join(origin)
+    if isinstance(max_age, timedelta):
+        max_age = max_age.total_seconds()
+
+    def get_methods():
+        if methods is not None:
+            return methods
+
+        options_resp = current_app.make_default_options_response()
+        return options_resp.headers['allow']
+
+    def decorator(f):
+        def wrapped_function(*args, **kwargs):
+            if automatic_options and request.method == 'OPTIONS':
+                resp = current_app.make_default_options_response()
+            else:
+                resp = make_response(f(*args, **kwargs))
+            if not attach_to_all and request.method != 'OPTIONS':
+                return resp
+
+            h = resp.headers
+
+            h['Access-Control-Allow-Origin'] = origin
+            h['Access-Control-Allow-Methods'] = get_methods()
+            h['Access-Control-Max-Age'] = str(max_age)
+            if headers is not None:
+                h['Access-Control-Allow-Headers'] = headers
+            return resp
+
+        f.provide_automatic_options = False
+        return update_wrapper(wrapped_function, f)
+    return decorator