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This change cleans up the work in progress request at https://github.com/edx/edx-platform/pull/8176 This is an initial authentication implementation that allows LTI users to log in transparently to edX. The behavior is driven by pilot users at Harvard; this was the most requested feature. The patch creates a new database model that maps users' LTI identifiers to newly-created edX accounts. If an LTI launch comes in with a user_id field that is not in the database, a new edX account is created with a random user name and password. This account is then stored in the database, so that it is permanently associated with the LTI user ID. This patch takes a simplistic approach to session management. If a user is logged in with a different account when they perform an LTI launch, they will be logged out and then re-logged in using their LTI account. In order to keep the patch simple, I have split out some refactoring that needs to be done into a separate branch that I'll post once this has been merged. Since we no longer redirect to the login page, we don't need to maintain two separate LTI endpoints (one for the LTI launch and one for authenticated users), or deal with the session management that requires. There are also multiple fetches of the LtiConsumer object (one in the view, one in the signature validation) that the later patch will consolidate into one.
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