Moodle in English: Building own LTI Consumer for Moodle 3.2 fails at authentication

LTI and Moodle

Building own LTI Consumer for Moodle 3.2 fails at authentication

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Building own LTI Consumer for Moodle 3.2 fails at authentication

by Michael Berhorst - Monday, January 30, 2017, 10:51 PM

Hi,

I'm currently stuck creating an own LTI Consumer for Moodle 3.2.

Here is the sample code: https://gist.github.com/anonymous/bccbfc82caca18cf7896338475bbaf21

I used the IMSGlobal/LTI Library for creating a consumer and building the request. But all I get is an error:

Failed request. Reason: Invalid signature

Sometimes it says: Invalid nonce. But at the end it does not work. Using a second moodle 3.2 instance as Consumer works fine. And I really dont see any difference in the basic launch request parameters. Which is totally frustrating. :/

Re: Building own LTI Consumer for Moodle 3.2 fails at authentication

by Michael Berhorst - Tuesday, January 31, 2017, 1:05 AM

Update: solved.

The code was correct. It was my own fault. The secret I set was never used. :/ It was defaulted to 'secret'.

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