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rsolande
(@rsolande)

8 months, 1 week ago

Hello,

I’m having trouble setting up the LTI 1.3 tool for wordpress in Blackboard. We previously had the basic LTI 1.0 setup and have several instructors who use the tool frequently – so we need to migrate.

We’re using pressable hosting on PHP 8.2, 10.6.18-MariaDB

I’m getting this error when trying to launch the 1.3 tool from a web link. I’ve installed LTI-Tool plugin and the Celtic Library on our WordPress.

I’ve set up the application on developer.anthology.com

Our URL: https://stagingltitest.mystagingwebsite.com
Login Initiation URL https://stagingltitest.mystagingwebsite.com/?lti-tool
Tool Redirect URL(s) https://stagingltitest.mystagingwebsite.com/?lti-tool
Tool JWKS URL https://stagingltitest.mystagingwebsite.com/?lti-tool&keys

LTI 1.3 Settings in WP LTI-Tool LTI Platform settings:

Platform ID https://blackboard.com
Client ID (Secret from Anthology Dev site)
Deployment ID (Application ID from Anthology Dev site)
Authorization server ID
Authentication request URL https://developer.anthology.com/api/v1/gateway/oidcauth
Access token URL https://developer.anthology.com/api/v1/gateway/oauth2/jwttoken
Public keyset URL https://developer.blackboard.com/.well-known/jwks.json
Public key (Blank)

In Blackboard I’m launching a weblink URL https://stagingltitest.mystagingwebsite.com/?lti-tool with LTI Launch.

Here is the error I’m finding in the logs it seems to be coming back with:

[ERROR] Request failed with reason: ‘Unable to generate a WordPress user_login’
See:
/srv/htdocs/wp-content/plugins/celtic-lti/vendor/celtic/lti/src/Util.php line 213
/srv/htdocs/wp-content/plugins/celtic-lti/vendor/celtic/lti/src/Tool.php line 487
/srv/htdocs/wp-content/plugins/lti-tool/lti-tool.php line 248
/wordpress/core/6.5.5/wp-includes/class-wp-hook.php line 324
/wordpress/core/6.5.5/wp-includes/class-wp-hook.php line 348
/wordpress/core/6.5.5/wp-includes/plugin.php line 565
/wordpress/core/6.5.5/wp-includes/class-wp.php line 418
/wordpress/core/6.5.5/wp-includes/class-wp.php line 813
/wordpress/core/6.5.5/wp-includes/functions.php line 1336
/wordpress/core/6.5.5/wp-blog-header.php line 16
/wordpress/core/6.5.5/index.php line 17

What do I need to do to get this to connect? Are my settings correct? Does the username format matter (I’ve selected username only)?

Thank you for your time

Viewing 3 replies - 1 through 3 (of 3 total)

Plugin Author Stephen P Vickers
(@spvickers)

8 months, 1 week ago

Since you have set the username format to “username”, you should check that your Blackboard instance is sending the username to WordPress in its LTI launch messages; I am not sure that it does by default. If it is not, try adding a custom parameter of “username=$User.username”.

Thread Starter rsolande
(@rsolande)

8 months, 1 week ago

Hi Stephen,

Thanks for the wonderful tool here – your suggestion worked perfectly! I added it to custom parameters like you suggested and it is now connecting. I have another thing here, our blog names are coming over as an example: “Resource _530855_1courseblogs” I assume this is either the ContextID or the resource_link_id; we had this set to map to the Course ID of a course in Blackboard before using LTI 1.0 – I haven’t found success yet using custom variables. Do you know how we could accomplish this or what variable we need to send?

-Rob

Plugin Author Stephen P Vickers
(@spvickers)

8 months ago

A blog is named using the title of a resource link from the LTI platform. In your case it looks like no resource link title is being passed and so the fallback is to use a title of “Resource ” followed by the resource link ID. Check the settings of your LTI configuration to have the title parameter passed in LTI messages.

Viewing 3 replies - 1 through 3 (of 3 total)

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