feat(moderation): appeals (6c) + Discord reversal on approve (6d)

Players whose linked Discord identity was banned or muted can now submit
an appeal from the portal and track it; staff get a queue in the admin
moderation section to claim and resolve (approve/deny) appeals. Approving
a ban/mute appeal best-effort asks the Discord bot to reverse the action
(unban / clear timeout) via the internal API and posts a mod-log embed; a
down bot never fails the resolution (reversal_status is recorded).

- Schema: new server-owned `appeals` table (no cross-owner FK to
  mod_actions; existence validated in app code).
- Server: model/appeals/* + player appeals controller (submit/mine/
  eligible/withdraw) and admin queue handlers (list/claim/resolve/
  per-user) under the existing admin+moderator gate; one-active-appeal
  enforced app-side; eligibility keyed on the caller's linked Discord id.
- 6d: bot POST /internal/mod-reverse (+ modLog.postReversal) and
  server botInternalClient.reverseModAction, wired into resolve().
- Client: admin Appeals queue + resolve modal, ModerationUser appeals
  tab, player Appeals page (submit/withdraw), nav + routes + api methods.
- Docs: swagger annotations + component schemas, regenerated output.
- Tests: appeals controller + pure suites (server npm test 224 green).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XmHdsbnLzDMAVQkAoTQSBe

server/src/router/v1/player/appeals.controller.js

@@ -0,0 +1,101 @@
+// Player self-service moderation appeals (Phase 6c). A player appeals one of
+// their OWN ban/mute mod_actions: they see the actions they're allowed to appeal
+// (ban/mute with no active appeal), submit one, view their appeals, and withdraw
+// one that hasn't been resolved yet. Ownership is proven by matching the
+// action's target_user_id against the caller's linked Discord identity — the
+// same (provider='discord', subject=<snowflake>) link the SSO flow writes.
+// Mounted behind the player-role gate (see player.routes.js).
+const appeals = require('../../../model/appeals/appeals.model')
+const appealsDb = require('../../../model/appeals/appeals.db')
+const { isAppealableType, isTerminal } = require('../../../model/appeals/appeals.pure')
+const userIdentities = require('../../../model/userIdentities/userIdentities.model')
+
+const log = require('../../../utils/logger')('player-appeals')
+
+// The caller's linked Discord snowflake, or null if they have no Discord
+// identity linked. mod_actions are keyed by this snowflake.
+async function callerDiscordSubject(userId) {
+  const identities = await userIdentities.listForUser(userId)
+  const discord = identities.find((i) => i.provider === 'discord')
+  return discord ? discord.subject : null
+}
+
+// GET /player/appeals — the caller's own appeals, newest first.
+async function listMine(req, res) {
+  try {
+    return res.json(await appeals.listMine(req.user.id))
+  } catch (err) {
+    log.error('listMine failed', { error: err.message })
+    return res.status(500).json({ message: 'Internal Server Error' })
+  }
+}
+
+// GET /player/appeals/eligible — the caller's ban/mute actions with no active
+// appeal. If the caller has no linked Discord account we return [] (not an
+// error) so the UI can show a "link your Discord account" hint instead.
+async function listEligible(req, res) {
+  try {
+    const subject = await callerDiscordSubject(req.user.id)
+    if (!subject) return res.json([])
+    return res.json(await appealsDb.eligibleActions(subject))
+  } catch (err) {
+    log.error('listEligible failed', { error: err.message })
+    return res.status(500).json({ message: 'Internal Server Error' })
+  }
+}
+
+// POST /player/appeals — open an appeal for one of the caller's own actions.
+async function create(req, res) {
+  try {
+    const modActionId = Number(req.body.mod_action_id)
+    const submittedText = req.body.submitted_text
+
+    const action = await appealsDb.getModAction(modActionId)
+    if (!action) return res.status(404).json({ message: 'Mod action not found' })
+
+    const subject = await callerDiscordSubject(req.user.id)
+    if (!subject || String(action.target_user_id) !== String(subject)) {
+      return res.status(403).json({ message: 'This action is not yours to appeal' })
+    }
+
+    if (!isAppealableType(action.action_type)) {
+      return res.status(400).json({ message: 'Only bans and mutes can be appealed' })
+    }
+
+    const active = await appeals.activeForAction(modActionId)
+    if (active) return res.status(409).json({ message: 'An appeal for this action is already open' })
+
+    const appeal = await appeals.submit({
+      modActionId,
+      discordUserId: subject,
+      actionType: action.action_type,
+      userId: req.user.id,
+      submittedText,
+    })
+    return res.status(201).json(appeal)
+  } catch (err) {
+    log.error('create failed', { error: err.message })
+    return res.status(500).json({ message: 'Internal Server Error' })
+  }
+}
+
+// POST /player/appeals/:id/withdraw — the owner withdraws a non-resolved appeal.
+async function withdraw(req, res) {
+  try {
+    const appeal = await appeals.getById(Number(req.params.id))
+    // 404 for both "no such appeal" and "not the caller's" — never confirm the
+    // existence of another player's appeal.
+    if (!appeal || appeal.user_id !== req.user.id) {
+      return res.status(404).json({ message: 'Appeal not found' })
+    }
+    if (isTerminal(appeal.status)) {
+      return res.status(409).json({ message: 'This appeal is already resolved' })
+    }
+    return res.json(await appeals.withdraw(appeal.id))
+  } catch (err) {
+    log.error('withdraw failed', { error: err.message })
+    return res.status(500).json({ message: 'Internal Server Error' })
+  }
+}
+
+module.exports = { listMine, listEligible, create, withdraw }

server/src/router/v1/player/player.routes.js

@@ -11,6 +11,7 @@ const { body, param } = require('express-validator')
 
 const account = require('../admin/account.controller')
 const shard = require('./shard.controller')
+const appeals = require('./appeals.controller')
 const { requireAuth, requireRole } = require('../../../auth/session.middleware')
 const noindex = require('../../../middleware/noindex')
 const validate = require('../../../middleware/validate')
@@ -232,4 +233,58 @@ playerRouter.get(
   shard.getHouses,
 )
 
+// ── Moderation appeals (uo-link / Discord moderation) ──────────────────────
+// A player appeals one of their own ban/mute mod_actions. Ownership is proven by
+// matching the action against the caller's linked Discord identity.
+playerRouter.get(
+  '/appeals',
+  // #swagger.tags = ['Player · Appeals']
+  // #swagger.summary = 'List the caller’s moderation appeals'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.responses[200] = { description: 'The caller’s appeals', content: { "application/json": { schema: { type: "array", items: { $ref: "#/components/schemas/Appeal" } } } } } */
+  /* #swagger.responses[403] = { description: 'Player role required, or account not active', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  appeals.listMine,
+)
+playerRouter.get(
+  '/appeals/eligible',
+  // #swagger.tags = ['Player · Appeals']
+  // #swagger.summary = 'List the caller’s ban/mute actions eligible for appeal'
+  // #swagger.description = 'The caller’s ban/mute mod_actions that have no active appeal. Returns an empty array when the caller has no linked Discord account (the UI shows a “link Discord” hint).'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.responses[200] = { description: 'Appealable actions', content: { "application/json": { schema: { type: "array", items: { $ref: "#/components/schemas/AppealEligibleAction" } } } } } */
+  /* #swagger.responses[403] = { description: 'Player role required, or account not active', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  appeals.listEligible,
+)
+playerRouter.post(
+  '/appeals',
+  // #swagger.tags = ['Player · Appeals']
+  // #swagger.summary = 'Submit a moderation appeal for one of the caller’s actions'
+  // #swagger.description = 'Opens an appeal for a ban/mute mod_action that belongs to the caller (its target matches the caller’s linked Discord identity) and has no active appeal.'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.requestBody = { required: true, content: { "application/json": { schema: { $ref: "#/components/schemas/CreateAppealRequest" } } } } */
+  /* #swagger.responses[201] = { description: 'Appeal created', content: { "application/json": { schema: { $ref: "#/components/schemas/Appeal" } } } } */
+  /* #swagger.responses[400] = { description: 'Validation error, or the action type is not appealable', content: { "application/json": { schema: { $ref: "#/components/schemas/ValidationError" } } } } */
+  /* #swagger.responses[403] = { description: 'The action does not belong to the caller', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  /* #swagger.responses[404] = { description: 'Mod action not found', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  /* #swagger.responses[409] = { description: 'An appeal for this action is already open', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  accountChangeLimiter,
+  body('mod_action_id').isInt({ min: 1 }).toInt(),
+  body('submitted_text').isString().trim().isLength({ min: 1, max: 4000 }),
+  validate,
+  appeals.create,
+)
+playerRouter.post(
+  '/appeals/:id/withdraw',
+  // #swagger.tags = ['Player · Appeals']
+  // #swagger.summary = 'Withdraw one of the caller’s pending appeals'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  // #swagger.parameters['id'] = { in: 'path', required: true, schema: { type: 'integer' }, description: 'Appeal id (must belong to the caller).' }
+  /* #swagger.responses[200] = { description: 'The withdrawn appeal', content: { "application/json": { schema: { $ref: "#/components/schemas/Appeal" } } } } */
+  /* #swagger.responses[404] = { description: 'No such appeal for the caller', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  /* #swagger.responses[409] = { description: 'Appeal is already resolved', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  param('id').isInt({ min: 1 }),
+  validate,
+  appeals.withdraw,
+)
+
 module.exports = playerRouter