test script taken from eehouse.org (it works)

xwords4/relay/scripts/fcm_msg.py

@@ -0,0 +1,73 @@
+#!/usr/bin/python
+
+import sys, psycopg2, json, urllib, urllib2
+from oauth2client.service_account import ServiceAccountCredentials
+
+# I'm not checking my key in...
+import mykey2
+
+FCM_URL = 'https://fcm.googleapis.com/v1/projects/fcmtest-9fe99/messages:send'
+SCOPES = ["https://www.googleapis.com/auth/firebase.messaging"]
+
+def usage():
+    print 'usage:', sys.argv[0], '[--to <name>] msg'
+    sys.exit()
+
+def get_access_token():
+    credentials = ServiceAccountCredentials.from_json_keyfile_name(
+        'service-account.json', SCOPES)
+    access_token_info = credentials.get_access_token()
+    print 'token:', access_token_info.access_token
+    return access_token_info.access_token
+    
+def sendMsg( devid, msg ):
+    values = {
+        'message' : {
+            'token' : devid,
+            'data' : { 'title' : 'Re: CrossWords',
+                       'teaser' : 'Please tap to read in the app',
+                       'msg' : msg,
+            }
+        }
+    }
+    
+    params = json.dumps( values )
+    print params
+    for ignore in [True, True]:
+        req = urllib2.Request( FCM_URL, params )
+        # req.add_header( 'Content-Type' , 'application/x-www-form-urlencoded;charset=UTF-8' )
+        req.add_header('Authorization', 'Bearer ' + get_access_token())
+        req.add_header('Content-Type', 'application/json')
+        print 'added headers'
+        # req.add_header( 'Authorization' , 'key=' + mykey2.myKey )
+        try:
+            response = urllib2.urlopen( req )
+            print 'urlopen done'
+            response = response.read()
+            print response
+        except urllib2.URLError as e:
+            print 'error from urlopen:', e.reason
+            if e.reason == 'Unauthorized':
+                g_accessToken = get_access_token()
+            else:
+                break
+
+def main():
+    to = None
+    msg = sys.argv[1]
+    if msg == '--to':
+        to = sys.argv[2]
+        msg = sys.argv[3]
+    elif 2 < len(sys.argv):
+        usage()
+    if not to in mykey2.devids.keys():
+        print 'Unknown --to param;', to, 'not in', ','.join(mykey2.devids.keys())
+        usage()
+    if not to: usage()
+    devid = mykey2.devids[to]
+    print 'sending: "%s" to' % msg, to
+    sendMsg( devid, msg )
+
+##############################################################################
+if __name__ == '__main__':
+    main()