[MDL-73673] LTI 1.3 launch fails without login - Moodle Tracker

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Affected Branches:
MOODLE_311_STABLE, MOODLE_400_STABLE
Pull from Repository:
https://github.com/schokocaylee/moodle
Pull 3.11 Branch:
MDL-73673-311-lti-launch-without-login-fix
Pull 3.11 Diff URL:
https://github.com/schokocaylee/moodle/commit/fa7db56d08fa45803689538a2ffeb65e8c4a8392
Pull Master Branch:
MDL-73673-master-lti-launch-without-login-fix
Pull Master Diff URL:
https://github.com/schokocaylee/moodle/commit/0ab84a34d4803046b0a546fc6237fac87d1f4c91

Observed behaviour:

When calling a LTI launch.php link without being logged in, Moodle throws an invalidrequest error.

Expected behaviour:

It should instead show up a login page and redirect to the LTI activity afterwards.

Steps to reproduce:

Create an LTI 1.3 external tool in Moodle
Set the tool to open in a New Window
Copy the link to that activity (e.g., https://moodle.example.org/mod/lti/launch.php?id=XXX)
Log out of Moodle
Call the copied link

has a non-specific relationship to

MDL-77004 LTI new window code fix (from MDL-69275)

has been marked as being related by

CONTRIB-9068 Links to an external tool in a completion progress block ignore launch container setting open in new window

will be (partly) resolved by

MDL-69275 User can open external tool submission from the gradebook

Component watchers:: Jake Dallimore, Ilya Tregubov, Kevin Percy, Mathew May, Mihail Geshoski, Shamim Rezaie