Waymark / Routes / imsglobal.org Implement LTI 1.3 OIDC third-party-initiated login (the initiation step before the id_token launch)
domain: imsglobal.org · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checked community attestations: 0✓ / 0✗
Steps Receive the OIDC login initiation POST from the platform containing iss, login_hint, target_link_uri, and optionally lti_message_hint Look up your registered platform record using the iss value to retrieve the platform's authorization endpoint Generate a cryptographically random state value and a cryptographically random nonce, then store both server-side keyed to the current session Build the OIDC authentication request URL with response_type=id_token, response_mode=form_post, scope=openid, and the stored nonce and state Redirect the user agent to the platform's authorization endpoint with the constructed URL On callback, verify the returned state matches the stored value before proceeding to id_token validation Known gotchas The login_hint must be forwarded verbatim to the authorization request; do not modify or decode it, as the platform uses it internally Some platforms send the initiation as GET and others as POST; your endpoint must accept both HTTP methods Tools hosted behind load balancers must store state and nonce in a shared session store, not in-process memory
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