Hi there,
We have been using Google Assignments in Moodle for some time but all of a sudden things have stopped working...
When adding content through the external tool all goes well until you save in Google Assignments and it passes back to Moodle (3.9); at which contentitem_return.php throws this error:
Exception - OAuth signature failed: Invalid signature ours= i+K2pu+DyaCzuvsQ4lP3ZTceT8c= yours=TUm+1Ejj+c/HmnixFatKMVhy5uc=
Debug: \nError code: generalexceptionmessage\n* line 1329 of /mod/lti/locallib.php:
moodle\\mod\\lti\\OAuthException thrown\n* line 71 of /mod/lti/contentitem_return.php:
call to lti_verify_oauth_signature()\n, referer: https://assignments.google.com/
The only change to our Moodle configuration of late was that we moved it behind a reverse proxy... I am wondering if the reverse proxy could be causing the error with the OAuth signature but don't really know how to begin troubleshooting that!
I have run a network trace in Chrome for the process too, and we are seeing a 404 error for contentitem_return.php at the same point as the OAuth error occurs...
Any help or pointers greatly received!
Jon
