Preserve conversation excerpts and deduplicate case evidence

src/lib/server/moderation/actions.ts

@@ -1,5 +1,6 @@
 import { randomUUID } from 'node:crypto';
 import { db } from '../db/index.js';
+import { archivedEvidenceSnapshots } from './evidence.js';
 import { AuthError } from '../auth/index.js';
 import { moderatorMaximumRestrictionMs, type AuthUser } from '../../auth.js';
 import {
@@ -7,7 +8,6 @@ import {
     isModerationCaseOpen,
     moderationCaseOutcomes,
     moderationCaseStatusLabels,
-    moderationGuid,
     type ModerationCaseStatus,
     type ModerationCasePriority,
     type ModerationGame,
@@ -404,42 +404,10 @@ function archivedEvidence(
     value: unknown,
     now: string
 ): number {
-    const requested = value as { matchId: unknown; message: unknown };
-    if (!requested || !Number.isSafeInteger(requested.matchId))
-        throw new AuthError('Choose a recorded chat message.');
-    textField(requested.message, 'Chat message', 4096);
-    // Evidence must match the archived bytes, including intentional whitespace.
-    const message = requested.message as string;
-    const match = db()
-        .prepare('SELECT game,server,started_at FROM leaderboard_matches WHERE id=?')
-        .get(requested.matchId) as { game: string; server: string; started_at: string } | undefined;
-    if (!match || match.game !== target.game)
-        throw new AuthError('The source match is unavailable.', 404);
-    const entries = db()
-        .prepare('SELECT entry FROM match_chat WHERE match_id=?')
-        .all(requested.matchId) as { entry: string }[];
-    const found = entries
-        .filter((row) => {
-            const entry = JSON.parse(row.entry);
-            return (
-                entry.type === 'message' &&
-                moderationGuid(target.game, entry.message.guid) === target.guid &&
-                entry.message.message === message
-            );
-        })
-        .slice(0, 10);
-    if (!found.length)
-        throw new AuthError('The original chat message could not be verified in the archive.', 409);
-    for (const row of found)
-        evidence(
-            actor,
-            id,
-            message,
-            `Archived chat · ${match.server} · match ${requested.matchId}`,
-            JSON.stringify({ matchId: requested.matchId, match, entry: JSON.parse(row.entry) }),
-            now
-        );
-    return found.length;
+    const snapshots = archivedEvidenceSnapshots(id, target, value);
+    for (const snapshot of snapshots)
+        evidence(actor, id, snapshot.text, snapshot.source, snapshot.snapshot, now);
+    return snapshots.length;
 }
 function updateCase(actor: AuthUser, input: Record<string, unknown>, now: string) {
     const row = caseRow(input.id);
@@ -548,6 +516,7 @@ export function mutateModeration(actorId: string, input: Record<string, unknown>
             const row = caseRow(input.id);
             checkCaseRevision(row, input.revision);
             const count = archivedEvidence(actor, row.id, row, input.evidence, now);
+            if (!count) return { id: row.id };
             touchCase(row.id, now);
             moderationEvent(
                 actor,