Added CORS headers to the JSON RPC API response

neo/api/JSONRPC/JsonRpcApi.py

@@ -17,7 +17,7 @@
 from neo import __version__
 from neo.Settings import settings
 from neo.Core.Blockchain import Blockchain
-from neo.api.utils import json_response
+from neo.api.utils import json_response, cors_header
 from neo.Core.State.AccountState import AccountState
 from neo.Core.TX.Transaction import Transaction
 from neocore.UInt160 import UInt160
@@ -81,6 +81,7 @@ def __init__(self, port):
     #
     @app.route('/')
     @json_response
+    @cors_header
     def home(self, request):
         # {"jsonrpc": "2.0", "id": 5, "method": "getblockcount", "params": []}
         body = None

neo/api/utils.py

@@ -11,3 +11,14 @@ def wrapper(self, request, *args, **kwargs):
         request.setHeader('Content-Type', 'application/json')
         return json.dumps(res) if isinstance(res, dict) else res
     return wrapper
+
+
+# @cors_header decorator to add the CORS headers
+def cors_header(func):
+    """ @cors_header decorator adds CORS headers """
+    @wraps(func)
+    def wrapper(self, request, *args, **kwargs):
+        res = func(self, request, *args, **kwargs)
+        request.setHeader('Access-Control-Allow-Origin', '*')
+        return res
+    return wrapper