[Brutus5000]

Summary

The NodeBB forum is moving from our own nodebb-plugin-sso-oauth-faforever to the official nodebb-plugin-sso-oauth2-multiple (which includes our user lookup endpoint contribution). The API uses that endpoint to find the forum user for a FAF user id when syncing username/email changes.

This PR adds a feature flag so the API can talk to either plugin and the switch can be done via environment variables only:

Env var	Default	Description
NODEBB_SSO_PLUGIN	LEGACY	LEGACY = nodebb-plugin-sso-oauth-faforever, OAUTH2_MULTIPLE = nodebb-plugin-sso-oauth2-multiple
NODEBB_SSO_PROVIDER_NAME	faf-nodebb	Name of the strategy configured in the new plugin

Differences handled for OAUTH2_MULTIPLE:

• Route: /api/v3/plugins/oauth2-multiple/provider/{provider}/user/{id} instead of /api/v3/plugins/sso/user/{id}
• Response: wrapped by NodeBB ({"status": {...}, "response": {"userData": {"uid": ...}}}) instead of the raw user object

The default keeps the current behaviour, so merging this changes nothing until the flag is set.

Migration instructions

No data migration is needed. Both plugins store the link in the same place, as long as the new strategy is named faf-nodebb:

• Hash faf-nodebbId:uid (FAF user id → NodeBB uid)
• User field faf-nodebbId
• Callback URL /auth/faf-nodebb/callback (the Hydra client registration stays unchanged)

Prerequisites

1. The plugin version containing the lookup endpoint (/oauth2-multiple/provider/:provider/user/:oAuthId) must be installed.
2. Hydra must issue sub = numeric FAF user id for the forum client, i.e. the client must not use subject_type: pairwise. Otherwise existing users are not found and duplicate accounts are created. Verify with a test login on staging.
3. The userinfo endpoint (https://hydra.<domain>/userinfo) returns sub, preferred_username, email, email_verified and roles. Request scope openid email public_profile.

Steps

1. Back up MongoDB (especially faf-nodebbId:uid and user:*).
2. Test on staging with a copy of the production DB: deactivate the old plugin, install the new one, create the strategy faf-nodebb (auth URL, token URL, userinfo URL as user route, client id/secret, scope, trustEmailVerified, roles→groups mapping for forum admins). Log in with an existing user and an admin: the NodeBB uid must stay the same and no new user may be created.
3. Deploy this PR with the default (NODEBB_SSO_PLUGIN=LEGACY). Nothing changes yet.
4. Cut over (about one NodeBB restart of downtime):
   1. Deactivate nodebb-plugin-sso-oauth-faforever, activate nodebb-plugin-sso-oauth2-multiple, create the strategy faf-nodebb, restart NodeBB.
   2. Set NODEBB_SSO_PLUGIN=OAUTH2_MULTIPLE on the API and restart it.
   3. Verify: login, forum admin groups, and a username change in FAF being synced to the forum.
5. Rollback: set NODEBB_SSO_PLUGIN=LEGACY, re-activate the old plugin and disable the strategy. The data is untouched.
6. After a few weeks: uninstall the old plugin and remove the LEGACY code path.

Behaviour differences to be aware of

• The old plugin made users in faf_server_administrators forum admins automatically. The new one uses the roles→groups mapping, based on the roles claim (USER + permission technical names).
• The new plugin only falls back to e-mail matching if trustEmailVerified is enabled (Hydra always sends email_verified: true).

Testing

Not compiled or tested locally yet. Needs verification against a staging NodeBB.

Summary by CodeRabbit

• New Features
  • Added configurable NodeBB single sign-on options, including OAuth2 Multiple support and a customizable provider name. Legacy remains the default, preserving existing sign-in behavior unless the configuration is changed.

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No actionable comments were generated in the recent review.

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• configuration.md

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Walkthrough

The NodeBB configuration adds SSO plugin and provider name settings. User ID lookup selects the endpoint and response format based on the configured plugin.

Changes: NodeBB SSO plugin selection

Layer / File(s)	Summary
Configure NodeBB SSO src/main/java/com/faforever/api/config/FafApiProperties.java, src/main/resources/config/application.yml, configuration.md	NodeBB configuration adds ssoPlugin and ssoProviderName, with defaults of LEGACY and faf-nodebb. The settings can be supplied through environment variables.
Select lookup endpoint and parse response src/main/java/com/faforever/api/forum/NodebbService.java	getNodebbUserId uses the legacy endpoint and direct response for LEGACY. Other plugin values use the OAuth2-multiple provider endpoint and extract the user from the wrapped response.

Priority: Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: Minimal · up to 16fd6

No actionable merge-blocking issue remains in the reviewed change. The default lookup remains compatible with the legacy plugin, and the new lookup uses the configured provider.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: support for nodebb-plugin-sso-oauth2-multiple during NodeBB user lookup.
Docstring Coverage		Docstring coverage is inconclusive: files from earlier reviews still need to be rechecked within the check's analysis limits. Not blocking.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @configuration.md:
- Line 62: Update the NODEBB_SSO_PLUGIN row in the configuration table: leave
the environment-variable dependency column empty and list LEGACY and
OAUTH2_MULTIPLE as allowed values in a separate note.

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📥 Commits

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📒 Files selected for processing: 4

• configuration.md
• src/main/java/com/faforever/api/config/FafApiProperties.java
• src/main/java/com/faforever/api/forum/NodebbService.java
• src/main/resources/config/application.yml

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