## Installation

### Canvas LTI

by Steven Marshall -
Number of replies: 2

Hi Everyone,

We have been working on setting up the Canvas LTI but are running into some issues. Canvas seems to pass information back to webwork when someone logs in but webwork don't do anything with it. I have checked the authen_LTI.conf over and over again, but can't find anything missing. I have had our Canvas admin double-check our password and the URL that is set in Canvas to ensure they match. I have ensured that the site.conf file has the correct "https" URL.

The following path was reconstructed by WeBWorK. It should match the path in the LMS: at /opt/webwork/webwork2/lib/WeBWorK/Authen/LTIAdvanced.pm line 379.https://testdrive.cas.ou.edu/webwork2/casit_test5/ at /opt/webwork/webwork2/lib/WeBWorK/Authen/LTIAdvanced.pm line 380.OAuth verification failed. Check the Consumer Secret and that the URL in the LMS exactly matches the WeBWorK URL as defined in site.conf. E.G. Check that if you have https in the LMS url then you have https in $server_root_url in site.conf at /opt/webwork/webwork2/lib/WeBWorK/Authen/LTIAdvanced.pm line 417. The site.conf URL info: ﻿$webwork_url       = '/webwork2';
$server_root_url = 'https://testdrive.cas.ou.edu'; So the URL that we have in Canvas is: https://testdrive.cas.ou.edu/webwork2 Anyone have a thought? In reply to Steven Marshall ### Re: Canvas LTI by John Zlater - I have been tasked with setting up a WeBWork Server (2.16) and creating the LTI setup to use with Brightspace. I have been wrestling with the same warning/issue with Brightspace D2L. Can anyone please help? • The following path was reconstructed by WeBWorK. It should match the path in the LMS: at /opt/webwork/webwork2/lib/WeBWorK/Authen/LTIAdvanced.pm line 453. • https://webwork.pennhighlands.edu/webwork2/myTestCourse/ at /opt/webwork/webwork2/lib/WeBWorK/Authen/LTIAdvanced.pm line 454. • OAuth verification failed. Check the Consumer Secret and that the URL in the LMS exactly matches the WeBWorK URL as defined in site.conf. E.G. Check that if you have https in the LMS url then you have https in$server_root_url in site.conf at /opt/webwork/webwork2/lib/WeBWorK/Authen/LTIAdvanced.pm line 493.

I'm using the following in my authen_LTI.conf

#$external_auth = 1; (commented out as shown, I've tried both ways with the same result)$preferred_source_of_username = "lis_person_contact_email_primary";

$strip_address_from_email = 1;$preferred_source_of_student_id = "ext_d2l_orgdefinedid";

I've verified Secret multiple times

I have verified roles

• roles => urn:lti:instrole:ims/lis/Student,Student,urn:lti:instrole:ims/lis/Learner,Learner

I have verified timing  is good (0)

• ===== timestamp info =======
• oauth_nonce = 1639595585
• WW_server_time = 1639595585
• diff(server-oauth) = 0 seconds (0 minutes)
• ============================ at /opt/webwork/webwork2/lib/WeBWorK/Authen/LTIAdvanced.pm line 151.
I have verified that the $server_root_url is accurate in site.conf and It matches the base URL of$LTIBasicToThisSiteURL, which also has the addition of the /webwork2 which matches the \$webwork_url

Here is  the info from the log file for the course:

[Wed Dec 15 14:13:05 2021] LOGIN FAILED OAuth verification failed.  Check the Consumer Secret and that the URL in the LMS exactly matches the WeBWorK URL.a111a1 - authentication failed: 0 user_id=a111a1 login_type=normal credential_source=LTIAdvanced host=10.76.10.10 port=62621 UA=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36 Edg/96.0.1054.53

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### Re: Canvas LTI

by John Zlater -
Update:
After turning on debugging in the constants.pm file, this is what I found in the debug log: