2021 lines
66 KiB
TypeScript
2021 lines
66 KiB
TypeScript
import { createChildLogger } from "@bete/shared/logger";
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import { delay, retryWithBackoff } from "@bete/shared/utils";
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import { LRUCache } from "lru-cache";
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import type { ChatCompletion } from "openai/resources/chat/completions";
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import { AbortError } from "p-retry";
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import { z } from "zod";
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import { config } from "../../shared/config/config.js";
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import { resizeImageForVision } from "../attachment-upload/imageResizer.js";
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import { extractMessageMediaEvidence } from "../message-capture/messageMetadata.js";
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import type {
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AnalysisResult,
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AttachmentRecord,
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MessageRecord,
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} from "../message-capture/types.js";
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import { formatModerationTextEvidenceForPrompt } from "./indonesianTextNormalizer.js";
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import { llmChat, llmVision } from "./llmClient.js";
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import { buildSystemPrompt as buildSystemPromptModular } from "./moderationPrompt.js";
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import { logModerationAnalysis, logModerationError } from "./responseLogger.js";
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import {
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getStickerFromCache,
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initStickerCache,
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isStickerCacheReady,
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setStickerInCache,
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} from "./stickerCache.js";
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import {
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buildCustomEmojiVisionPrompt,
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buildGeneralImageVisionPrompt,
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buildStickerTextOnlyWarning,
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buildStickerVisionPrompt,
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} from "./stickerPrompt.js";
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import {
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computeImagePhash,
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getCachedMediaAnalysis,
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getCachedMediaByPhash,
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getCachedUserModeration,
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getRecentCorrectedModerations,
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makeCustomEmojiCacheKey,
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makeImageCacheKey,
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makeStickerCacheKey,
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makeUserModerationCacheKey,
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setCachedUserModeration,
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upsertCachedMediaAnalysis,
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upsertCachedMediaByPhash,
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} from "./textCacheStore.js";
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import { extractUrlsFromText, fetchUrlSafely } from "./urlFetcher.js";
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const SeveritySchema = z.enum(["none", "low", "medium", "high", "critical"]);
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const RecommendedActionSchema = z.enum([
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"none",
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"monitor",
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"warn",
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"review",
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"delete",
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"escalate",
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]);
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const ResultItemSchema = z.object({
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message_id: z.union([z.string(), z.number()]).transform(String),
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status: z.enum(["clean", "warn", "flagged"]),
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flags: z.array(z.string()).optional(),
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score: z.number(),
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analysis: z.string().nullable().optional(),
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categories: z.array(z.string()).optional(),
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severity: SeveritySchema.optional(),
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confidence: z.number().optional(),
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recommended_action: RecommendedActionSchema.optional(),
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policy_version: z.string().optional(),
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evidence: z.array(z.string()).optional(),
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});
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const ModerationResponseSchema = z.object({
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results: z.array(ResultItemSchema),
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});
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const log = createChildLogger("llmModerationClient");
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/**
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* Fetches recent corrected false positives from the DB and formats them
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* as additional few-shot examples for the moderation prompt.
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*
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* Returns an empty string if no corrections are available (so the prompt
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* builder simply skips the section).
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*/
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async function buildCorrectedFewShotExamples(): Promise<string> {
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try {
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const corrections = await getRecentCorrectedModerations(5);
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if (corrections.length === 0) return "";
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const lines = [
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"## Contoh Koreksi False Positive (dari moderasi sebelumnya)",
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"Berikut adalah koreksi manual dari false positive yang pernah terjadi. Gunakan sebagai panduan tambahan:",
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];
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for (const c of corrections) {
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const origFlags = c.originalFlags.join(", ") || "(none)";
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const corrFlags = c.correctedFlags.join(", ") || "(clean)";
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const notes = c.correctionNotes ? ` — ${c.correctionNotes}` : "";
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lines.push(
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`- Konten: "${c.contentSnippet.substring(0, 100)}" → sebelumnya di-flag sebagai [${origFlags}], dikoreksi menjadi [${corrFlags}]${notes}`,
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);
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}
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lines.push(
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"JANGAN ulangi kesalahan yang sama. Jika konten serupa dengan contoh di atas, gunakan koreksi yang sudah ditentukan.",
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);
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return lines.join("\n");
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} catch {
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return "";
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}
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}
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/**
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* Enhanced deferral detection pattern (R9).
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*
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* Only matches patterns where the model explicitly states it cannot make
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* a decision and needs human review. Removed overly broad patterns that
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* caused false positives:
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* - "admin (perlu|harus|sebaiknya)" → common in regular sentences
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* - "bisa (berpotensi|mengandung)" → decisive statements, not deferral
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* - "maaf|sorry" → opinions/apologies, not deferral
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* - "saya tidak yakin|tahu|paham" → expressing uncertainty, not deferral
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*/
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const DEFERRAL_ANALYSIS_PATTERN =
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/(?:kurang (?:konteks|bukti|informasi|data) (?:untuk (?:menilai|menentukan|memutuskan)|untuk moderasi)|perlu (?:dicek|diperiksa|ditinjau|dikaji|dievaluasi) (?:oleh )?(?:admin|moderator|manusia|human review)|tidak (?:bisa|dapat|mampu) (?:menentukan|menilai|memastikan|menyimpulkan|memberi keputusan|memoderasi).*(?:karena (?:konteks tidak jelas|informasi tidak cukup|bukti kurang|konteks kurang|tidak cukup konteks)|data tidak cukup|informasi tidak lengkap)|cannot determine|insufficient (?:context|evidence|information) (?:to |for )?(?:moderate|judge|evaluate|decide|classify)|(?:sepertinya|tampaknya) (?:perlu|harus) (?:ditinjau|diperiksa|dicek) (?:oleh )?(?:admin|moderator)|tidak cukup (?:bukti|informasi|konteks) (?:untuk (?:memberikan|membuat|menentukan)|memutuskan))/i;
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/**
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* Exceptions: patterns that look like deferral but are actually decisive.
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* Expanded to catch more variations where the model gives a clear verdict.
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*/
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const DEFERRAL_EXCEPTION_PATTERN =
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/tidak bisa menentukan.*(?:karena|sebab|dengan alasan|sebab tidak ada).*(?:clean|tidak (?:ada|terdapat|menunjukkan).*(?:pelanggaran|masalah|indikasi|konten)|aman|bersih|normal)/i;
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function hasDeferralAnalysis(analysis: string): boolean {
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if (DEFERRAL_EXCEPTION_PATTERN.test(analysis)) return false;
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return DEFERRAL_ANALYSIS_PATTERN.test(analysis);
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}
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function clampScore(value: number | undefined, fallback = 0): number {
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return Math.max(
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0,
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Math.min(1, Number.isFinite(value) ? (value as number) : fallback),
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);
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}
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function deriveSeverity(
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status: "clean" | "warn" | "flagged",
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score: number,
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): z.infer<typeof SeveritySchema> {
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if (status === "clean") return "none";
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if (status === "warn") return score >= 0.65 ? "medium" : "low";
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if (score >= 0.9) return "critical";
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return score >= 0.75 ? "high" : "medium";
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}
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function deriveRecommendedAction(
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status: "clean" | "warn" | "flagged",
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severity: z.infer<typeof SeveritySchema>,
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): z.infer<typeof RecommendedActionSchema> {
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if (status === "clean") return "none";
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if (status === "warn") return severity === "medium" ? "review" : "warn";
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if (severity === "critical") return "escalate";
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if (severity === "high") return "delete";
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return "review";
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}
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/**
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* Helper to extract JSON from a potentially conversational or markdown-wrapped string.
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*/
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export function extractJson(content: string): any {
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const codeBlockRegex = /```(?:json)?\s*([\s\S]*?)\s*```/g;
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const matches = content.matchAll(codeBlockRegex);
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for (const match of matches) {
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const codeContent = match[1].trim();
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try {
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const parsed = JSON.parse(codeContent);
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if (parsed && typeof parsed === "object") {
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return parsed;
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}
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} catch (_) {}
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}
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for (let start = 0; start < content.length; start++) {
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const firstChar = content[start];
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if (firstChar !== "{" && firstChar !== "[") continue;
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const stack = [firstChar];
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let inString = false;
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let escaped = false;
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for (let i = start + 1; i < content.length; i++) {
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const char = content[i];
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if (inString) {
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if (escaped) {
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escaped = false;
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} else if (char === "\\") {
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escaped = true;
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} else if (char === '"') {
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inString = false;
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}
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continue;
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}
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if (char === '"') {
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inString = true;
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continue;
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}
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if (char === "{" || char === "[") {
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stack.push(char);
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continue;
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}
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const last = stack[stack.length - 1];
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if ((char === "}" && last === "{") || (char === "]" && last === "[")) {
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stack.pop();
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if (stack.length === 0) {
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const candidate = content.slice(start, i + 1);
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try {
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const parsed = JSON.parse(candidate);
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if (parsed && typeof parsed === "object") {
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return parsed;
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}
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} catch (_) {}
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break;
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}
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}
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}
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}
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throw new Error("No JSON object found in response");
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}
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/**
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* Sanitize error messages for client-facing output (R10).
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* Internal details are logged but the caller gets a generic message.
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*/
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function sanitizeErrorMessage(internalMsg: string, messageId: string): string {
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// Log the full error for debugging
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log.warn(
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{ messageId, internalError: internalMsg },
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"Internal moderation error (sanitized for client)",
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);
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// Return generic message without internal details
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return `Analisis gagal dan memerlukan pemeriksaan manual. Error code: MOD_${Date.now().toString(36).slice(0, 6)}`;
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}
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export function parseModerationResponse(
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content: string,
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targetIds: string[],
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): AnalysisResult[] {
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let parsed: any;
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try {
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parsed = JSON.parse(content);
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} catch (e) {
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parsed = extractJson(content);
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}
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if (Array.isArray(parsed)) {
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parsed = { results: parsed };
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} else if (parsed && typeof parsed === "object" && !("results" in parsed)) {
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if ("message_id" in parsed) {
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parsed = { results: [parsed] };
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} else {
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const arrayKey = Object.keys(parsed).find((key) => {
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const val = (parsed as any)[key];
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return (
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Array.isArray(val) &&
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val.length > 0 &&
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val.every(
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(item: unknown) =>
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typeof item === "object" &&
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item !== null &&
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"message_id" in (item as any),
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)
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);
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});
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if (arrayKey) {
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parsed.results = (parsed as any)[arrayKey];
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} else {
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parsed = { results: [parsed] };
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}
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}
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}
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const parseResult = ModerationResponseSchema.safeParse(parsed);
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if (!parseResult.success) {
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throw new Error(`Zod validation failed: ${parseResult.error.message}`);
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}
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const response = parseResult.data;
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const foundIds = new Set<string>();
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const targetIdSet = new Set(targetIds);
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const results: (AnalysisResult | null)[] = response.results.map((result) => {
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const {
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message_id,
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status,
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flags,
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score,
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analysis,
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categories,
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severity,
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confidence,
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recommended_action,
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policy_version,
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evidence,
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} = result;
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const finalId = message_id.trim();
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if (!targetIdSet.has(finalId)) {
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return null;
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}
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if (foundIds.has(finalId)) {
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throw new Error(
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`Duplicate message_id in moderation response: ${finalId}`,
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);
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}
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foundIds.add(finalId);
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const coalescedAnalysis = analysis ?? "";
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if (hasDeferralAnalysis(coalescedAnalysis)) {
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throw new Error(
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`Deferral analysis is not allowed for message ${finalId}; return a direct moderation decision`,
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);
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}
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const normalizedScore = clampScore(score);
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const normalizedConfidence = clampScore(confidence, normalizedScore);
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const normalizedSeverity =
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severity ?? deriveSeverity(status, normalizedScore);
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return {
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messageId: finalId,
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status: status as "clean" | "warn" | "flagged",
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flags: flags ?? [],
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score: normalizedScore,
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analysis: coalescedAnalysis,
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categories: categories ?? flags ?? [],
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severity: normalizedSeverity,
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confidence: normalizedConfidence,
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recommendedAction:
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recommended_action ??
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deriveRecommendedAction(status, normalizedSeverity),
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policyVersion: policy_version ?? "default-2026-05-30",
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evidence: evidence ?? [],
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};
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});
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const filteredResults = results.filter(
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(r): r is AnalysisResult => r !== null,
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);
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const missingIds = targetIds.filter((id) => !foundIds.has(id));
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if (missingIds.length > 0) {
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log.warn(
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{ missingIds, foundCount: foundIds.size, totalCount: targetIds.length },
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"Some target IDs missing in response - marking as incomplete",
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);
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for (const missingId of missingIds) {
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filteredResults.push({
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messageId: missingId,
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status: "error",
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flags: ["analysis_incomplete"],
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score: 0,
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analysis: sanitizeErrorMessage(
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"Analysis incomplete - LLM did not process this message",
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missingId,
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),
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categories: ["analysis_incomplete"],
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severity: "none",
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confidence: 0,
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recommendedAction: "review",
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policyVersion: "default-2026-05-30",
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evidence: [],
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});
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}
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}
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return filteredResults;
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}
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interface ModerationInput {
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targets: MessageRecord[];
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contextText: string;
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attachments?: AttachmentRecord[];
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}
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interface ModerationOutput {
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results: AnalysisResult[];
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raw: unknown;
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}
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/**
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* Sniff the first bytes of a buffer to determine if it is a supported image
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* format. Returns the canonical MIME type string on success, or null if the
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* bytes are not a recognizable image.
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*/
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function sniffImageMimeType(buf: Buffer): string | null {
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if (buf.length < 12) return null;
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if (buf[0] === 0xff && buf[1] === 0xd8 && buf[2] === 0xff) {
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return "image/jpeg";
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}
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if (
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buf[0] === 0x89 &&
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buf[1] === 0x50 &&
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buf[2] === 0x4e &&
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buf[3] === 0x47 &&
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buf[4] === 0x0d &&
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buf[5] === 0x0a &&
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buf[6] === 0x1a &&
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buf[7] === 0x0a
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) {
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return "image/png";
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}
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|
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if (
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buf[0] === 0x47 &&
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buf[1] === 0x49 &&
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buf[2] === 0x46 &&
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buf[3] === 0x38
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) {
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return "image/gif";
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}
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|
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if (
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buf[0] === 0x52 &&
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buf[1] === 0x49 &&
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buf[2] === 0x46 &&
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buf[3] === 0x46 &&
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buf[8] === 0x57 &&
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buf[9] === 0x45 &&
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buf[10] === 0x42 &&
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buf[11] === 0x50
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) {
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return "image/webp";
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|
}
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|
|
|
if (
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buf.length >= 12 &&
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buf[4] === 0x66 &&
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buf[5] === 0x74 &&
|
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buf[6] === 0x79 &&
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buf[7] === 0x70
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) {
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const brand = buf.subarray(8, 12).toString("ascii");
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if (brand.startsWith("avif") || brand.startsWith("avis")) {
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return "image/avif";
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}
|
|
if (
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brand.startsWith("mif1") ||
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brand.startsWith("heic") ||
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brand.startsWith("heis")
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) {
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return "image/heic";
|
|
}
|
|
}
|
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|
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return null;
|
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}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Shared types for image resolution
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|
// ---------------------------------------------------------------------------
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|
|
|
type MessageImagePart = {
|
|
type: "image_url";
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|
image_url: { url: string };
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sourceLabel: string;
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|
stickerName?: string;
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|
customEmojiId?: string;
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|
customEmojiName?: string;
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};
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|
|
// ---------------------------------------------------------------------------
|
|
// Content helpers
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Returns the real text content for AI analysis, stripping fallback text
|
|
* that getDisplayContent() synthesized ("[Attachment: ...]", "[Sticker: ...]",
|
|
* "[Embed]"). These filenames alone are meaningless to the LLM and can
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* falsely inflate a "clean" verdict when the actual image failed to download.
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*/
|
|
function getAnalysisContent(message: MessageRecord): string {
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const raw = message.edited_content ?? message.content;
|
|
const stripped = raw.replace(
|
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/\[(?:Attachment|Sticker):[^\]]*\]|\[Embed\]/g,
|
|
"",
|
|
);
|
|
return stripped.trim();
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Media detection helper
|
|
// ---------------------------------------------------------------------------
|
|
|
|
function hasMediaContent(
|
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target: MessageRecord,
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attachments?: AttachmentRecord[],
|
|
): boolean {
|
|
if (target.metadata) {
|
|
const evidence = extractMessageMediaEvidence(target.metadata);
|
|
if (evidence.stickers.length > 0 || evidence.embeds.length > 0) return true;
|
|
}
|
|
if (attachments?.some((a) => a.message_id === target.id)) return true;
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|
return false;
|
|
}
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|
|
|
// ---------------------------------------------------------------------------
|
|
// Single-image vision analysis (reused by both text-only and media paths)
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/**
|
|
* In-memory LRU cache for vision analysis results.
|
|
* Fastest path — avoids DB round-trip for frequently seen images.
|
|
* Max 500 entries, 24-hour TTL.
|
|
*/
|
|
const visionLruCache = new LRUCache<string, string>({
|
|
max: 500,
|
|
ttl: 24 * 60 * 60 * 1000,
|
|
});
|
|
|
|
/**
|
|
* In-flight deduplication map — prevents concurrent vision API calls for
|
|
* the same cache key. Multiple concurrent requests for an identical image
|
|
* share the same promise, eliminating the race condition between cache
|
|
* check and cache write.
|
|
*/
|
|
const inFlightVisionCalls = new Map<string, Promise<string>>();
|
|
|
|
const FAILED_ANALYSIS_PREFIX =
|
|
"GAGAL DIANALISIS — gambar tidak dapat diunduh atau vision API gagal setelah 3x percobaan. JANGAN mengasumsikan gambar aman hanya karena gagal dianalisis. Gunakan metadata URL/nama file saja sebagai petunjuk.";
|
|
|
|
const analyzeSingleMediaImage = async (
|
|
messageId: string,
|
|
image: MessageImagePart,
|
|
): Promise<string> => {
|
|
const cacheKey = image.customEmojiId
|
|
? makeCustomEmojiCacheKey(image.customEmojiId)
|
|
: image.stickerName
|
|
? makeStickerCacheKey(image.stickerName)
|
|
: makeImageCacheKey(image.image_url.url);
|
|
|
|
// Layer 0: In-memory LRU cache (fastest — no DB or network I/O)
|
|
const lruCached = visionLruCache.get(cacheKey);
|
|
if (lruCached) {
|
|
log.debug({ cacheKey }, "Vision LRU cache HIT (in-memory)");
|
|
return `[Media analysis for message ${messageId}] ${image.sourceLabel}: ${lruCached}`;
|
|
}
|
|
|
|
// Layer 1: DB cache
|
|
const cached = await getCachedMediaAnalysis(cacheKey);
|
|
if (cached) {
|
|
visionLruCache.set(cacheKey, cached);
|
|
log.debug({ cacheKey }, "Media analysis cache HIT (DB → LRU)");
|
|
return `[Media analysis for message ${messageId}] ${image.sourceLabel}: ${cached}`;
|
|
}
|
|
|
|
// Deduplicate in-flight vision calls: if another caller is already
|
|
// processing this exact image, wait for it instead of starting a duplicate.
|
|
const existing = inFlightVisionCalls.get(cacheKey);
|
|
if (existing) {
|
|
log.debug(
|
|
{ cacheKey },
|
|
"Media analysis in-flight dedupe — waiting for existing call",
|
|
);
|
|
const result = await existing;
|
|
// result is never null — the promise always returns a descriptive string
|
|
return `[Media analysis for message ${messageId}] ${image.sourceLabel}: ${result}`;
|
|
}
|
|
|
|
const promptText = image.stickerName
|
|
? buildStickerVisionPrompt(image.stickerName, messageId)
|
|
: image.customEmojiName
|
|
? buildCustomEmojiVisionPrompt(image.customEmojiName, messageId)
|
|
: buildGeneralImageVisionPrompt(image.sourceLabel, messageId);
|
|
|
|
const visionPromise = (async (): Promise<string> => {
|
|
// Layer 2: Perceptual hash pre-check (before expensive vision API call)
|
|
let phash: string | null = null;
|
|
if (image.image_url.url.startsWith("data:")) {
|
|
try {
|
|
const base64Data = image.image_url.url.split(",")[1];
|
|
if (base64Data) {
|
|
const imgBuffer = Buffer.from(base64Data, "base64");
|
|
phash = await computeImagePhash(imgBuffer);
|
|
if (phash) {
|
|
const phashCached = await getCachedMediaByPhash(phash);
|
|
if (phashCached) {
|
|
log.debug(
|
|
{ cacheKey, phash: phash.slice(0, 16) },
|
|
"Vision phash HIT — reusing analysis",
|
|
);
|
|
visionLruCache.set(cacheKey, phashCached);
|
|
await upsertCachedMediaAnalysis(
|
|
cacheKey,
|
|
phashCached,
|
|
"vision_llm",
|
|
Date.now() + 24 * 60 * 60 * 1000,
|
|
).catch(() => {});
|
|
return phashCached;
|
|
}
|
|
}
|
|
}
|
|
} catch {
|
|
// phash failed — continue with normal vision API flow
|
|
phash = null;
|
|
}
|
|
}
|
|
|
|
// ── Vision API call with EXTERNAL exponential backoff ──
|
|
// Uses retryWithBackoff directly so each retry has proper backoff delay.
|
|
// llmVision calls llmChat which also has retryWithBackoff, but its
|
|
// inner backoff has minTimeout=0 (instant). Our outer backoff ensures
|
|
// meaningful delay between full attempts.
|
|
let lastError: Error | null = null;
|
|
for (let attempt = 0; attempt < 3; attempt++) {
|
|
try {
|
|
const content = await llmVision(promptText, image.image_url);
|
|
if (content) {
|
|
// Success — persist to all cache layers
|
|
await upsertCachedMediaAnalysis(
|
|
cacheKey,
|
|
content,
|
|
"vision_llm",
|
|
Date.now() + 24 * 60 * 60 * 1000,
|
|
);
|
|
visionLruCache.set(cacheKey, content);
|
|
if (phash) {
|
|
upsertCachedMediaByPhash(
|
|
phash,
|
|
content,
|
|
"vision_llm",
|
|
Date.now() + 7 * 24 * 60 * 60 * 1000,
|
|
).catch(() => {});
|
|
}
|
|
return content;
|
|
}
|
|
// llmVision returned null (no API key / client unavailable) — no point retrying
|
|
log.warn(
|
|
{ messageId },
|
|
"Vision API client unavailable (null response) — skipping retry",
|
|
);
|
|
break;
|
|
} catch (err) {
|
|
lastError = err instanceof Error ? err : new Error(String(err));
|
|
if (attempt < 2) {
|
|
const backoffMs = Math.min(
|
|
1_000 * 2 ** attempt + Math.random() * 200,
|
|
8_000,
|
|
);
|
|
log.warn(
|
|
{
|
|
messageId,
|
|
attempt: attempt + 1,
|
|
backoffMs,
|
|
error: lastError.message,
|
|
},
|
|
"Vision API attempt failed — backing off before retry",
|
|
);
|
|
await delay(backoffMs);
|
|
}
|
|
}
|
|
}
|
|
|
|
// All attempts exhausted — return descriptive failure text.
|
|
// NOT null: the caller must always have a descriptive string to
|
|
// inject into the prompt so the LLM knows the image was skipped.
|
|
log.warn(
|
|
{
|
|
messageId,
|
|
lastError: lastError?.message ?? "null response",
|
|
},
|
|
"Vision analysis failed after all retry attempts",
|
|
);
|
|
return FAILED_ANALYSIS_PREFIX;
|
|
})();
|
|
|
|
inFlightVisionCalls.set(cacheKey, visionPromise);
|
|
|
|
try {
|
|
const content = await visionPromise;
|
|
return `[Media analysis for message ${messageId}] ${image.sourceLabel}: ${content}`;
|
|
} catch (outerErr) {
|
|
// Should never reach here — visionPromise has its own catch that
|
|
// returns FAILED_ANALYSIS_PREFIX. Log anyway for debugging.
|
|
log.error(
|
|
{
|
|
messageId,
|
|
cacheKey,
|
|
error: outerErr instanceof Error ? outerErr.message : String(outerErr),
|
|
},
|
|
"Unexpected rejection in analyzeSingleMediaImage (visionPromise threw)",
|
|
);
|
|
return `[Media analysis for message ${messageId}] ${image.sourceLabel}: ${FAILED_ANALYSIS_PREFIX}`;
|
|
} finally {
|
|
inFlightVisionCalls.delete(cacheKey);
|
|
}
|
|
};
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Shared LLM call + parse + fallback helper
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/**
|
|
* State object shared between the caller and callModerationLLM so that
|
|
* parse-error feedback can be injected into subsequent retry attempts.
|
|
*
|
|
* The caller creates this object, passes it to callModerationLLM, and
|
|
* the internal retry loop mutates it before re-invoking buildContent().
|
|
*/
|
|
interface RetryState {
|
|
lastParseError: string | null;
|
|
lastInvalidContent: string | null;
|
|
}
|
|
|
|
/**
|
|
* Execute a single LLM moderation call (batch or single-message) with retry
|
|
* logic, JSON parse, and fallback error markers on failure.
|
|
*
|
|
* Uses JSON Schema response format (R2) and concurrency limiter (R3).
|
|
*/
|
|
async function callModerationLLM(
|
|
buildContent: (state: RetryState) => Promise<string>,
|
|
targetIds: string[],
|
|
label: string,
|
|
): Promise<{
|
|
results: AnalysisResult[];
|
|
raw: ChatCompletion | null;
|
|
}> {
|
|
const state: RetryState = {
|
|
lastParseError: null,
|
|
lastInvalidContent: null,
|
|
};
|
|
|
|
let parsed: AnalysisResult[];
|
|
let result: ChatCompletion | null = null;
|
|
|
|
try {
|
|
const analysis = await retryWithBackoff(
|
|
async () => {
|
|
try {
|
|
const content = await buildContent(state);
|
|
|
|
const completion = await llmChat({
|
|
messages: [{ role: "user", content }],
|
|
max_tokens: 16384,
|
|
jsonResponse: { type: "json_object" },
|
|
retries: 0,
|
|
});
|
|
|
|
if (!completion) {
|
|
throw new Error("LLM client unavailable (no API key)");
|
|
}
|
|
|
|
if (
|
|
!completion.choices ||
|
|
!Array.isArray(completion.choices) ||
|
|
!completion.choices[0]
|
|
) {
|
|
throw new Error("Invalid LLM response structure");
|
|
}
|
|
|
|
const rawContent = completion.choices[0].message?.content;
|
|
if (!rawContent) {
|
|
throw new Error("No content in LLM response");
|
|
}
|
|
|
|
try {
|
|
return {
|
|
parsed: parseModerationResponse(rawContent, targetIds),
|
|
result: completion,
|
|
};
|
|
} catch (parseError) {
|
|
state.lastParseError =
|
|
parseError instanceof Error
|
|
? parseError.message
|
|
: String(parseError);
|
|
state.lastInvalidContent = rawContent;
|
|
log.warn(
|
|
{
|
|
error: state.lastParseError,
|
|
contentLength: rawContent.length,
|
|
contentPreview: rawContent.substring(0, 1000),
|
|
targetIds,
|
|
model: config.AI_LLM_MODEL,
|
|
},
|
|
`Failed to parse moderation response from LLM (${label})`,
|
|
);
|
|
throw parseError;
|
|
}
|
|
} catch (apiError: any) {
|
|
// 429/401/403 → abort immediately, never retry
|
|
if (
|
|
apiError?.status === 429 ||
|
|
apiError?.status === 401 ||
|
|
apiError?.status === 403
|
|
) {
|
|
throw new AbortError(apiError);
|
|
}
|
|
// 5xx server errors → retryable transient errors
|
|
// p-retry will retry these; on final exhaustion the outer catch
|
|
// will produce synthetic error results for all targets
|
|
if (
|
|
apiError?.status >= 500 ||
|
|
apiError?.code === "ECONNRESET" ||
|
|
apiError?.code === "ETIMEDOUT" ||
|
|
apiError?.name === "APIError"
|
|
) {
|
|
// re-throw as-is so p-retry can retry
|
|
throw apiError;
|
|
}
|
|
throw apiError;
|
|
}
|
|
},
|
|
{
|
|
retries: 2,
|
|
minTimeout: 3000,
|
|
maxTimeout: 8000,
|
|
factor: 2,
|
|
},
|
|
);
|
|
parsed = analysis.parsed;
|
|
result = analysis.result;
|
|
} catch (err) {
|
|
const errorMsg = err instanceof Error ? err.message : String(err);
|
|
const isApiError = !state.lastInvalidContent;
|
|
|
|
// For API errors (502, timeout, etc.) where retries exhausted, produce
|
|
// synthetic error results so the batch doesn't crash entirely.
|
|
// For parse errors, we already have lastInvalidContent and the existing
|
|
// fallback path below handles it.
|
|
const apiErrorCode = isApiError
|
|
? `MOD_${Date.now().toString(36).slice(0, 6)}`
|
|
: null;
|
|
|
|
if (isApiError) {
|
|
log.warn(
|
|
{
|
|
error: errorMsg,
|
|
targetIds,
|
|
model: config.AI_LLM_MODEL,
|
|
label,
|
|
},
|
|
`LLM API error after retries exhausted (${label}) — marking all targets as analysis errors`,
|
|
);
|
|
|
|
logModerationError(
|
|
targetIds,
|
|
config.AI_LLM_MODEL,
|
|
err instanceof Error ? err : new Error(String(err)),
|
|
{
|
|
phase: "api_call",
|
|
label,
|
|
},
|
|
);
|
|
|
|
parsed = targetIds.map((id) => ({
|
|
messageId: id,
|
|
status: "error",
|
|
flags: ["analysis_api_failed"],
|
|
score: 0,
|
|
analysis: `Analisis gagal karena error pada server AI dan memerlukan pemeriksaan manual. Error code: ${apiErrorCode}`,
|
|
categories: ["analysis_api_failed"],
|
|
severity: "none",
|
|
confidence: 0,
|
|
recommendedAction: "review",
|
|
policyVersion: "default-2026-05-30",
|
|
evidence: [],
|
|
}));
|
|
} else {
|
|
// Parse error fallback — existing path
|
|
const parseMsg = err instanceof Error ? err.message : String(err);
|
|
const contentPreview =
|
|
state.lastInvalidContent?.substring(0, 500) ?? "<empty>";
|
|
const contentLen = state.lastInvalidContent?.length ?? 0;
|
|
|
|
log.error(
|
|
{
|
|
error: parseMsg,
|
|
contentLength: contentLen,
|
|
contentPreview,
|
|
targetIds,
|
|
model: config.AI_LLM_MODEL,
|
|
timestamp: new Date().toISOString(),
|
|
},
|
|
`Robust Fallback (${label}): Failed to parse moderation response. Marking all targets as analysis errors.`,
|
|
);
|
|
|
|
// Log error with responseLogger
|
|
logModerationError(
|
|
targetIds,
|
|
config.AI_LLM_MODEL,
|
|
err instanceof Error ? err : new Error(String(err)),
|
|
{
|
|
phase: "parse_response",
|
|
label,
|
|
contentLength: contentLen,
|
|
},
|
|
);
|
|
|
|
// Sanitized error messages — no internal details exposed (R10)
|
|
const errorCode = `MOD_${Date.now().toString(36).slice(0, 6)}`;
|
|
parsed = targetIds.map((id) => ({
|
|
messageId: id,
|
|
status: "error",
|
|
flags: ["analysis_parse_failed"],
|
|
score: 0,
|
|
analysis: `Analisis gagal dan memerlukan pemeriksaan manual. Error code: ${errorCode}`,
|
|
categories: ["analysis_parse_failed"],
|
|
severity: "none",
|
|
confidence: 0,
|
|
recommendedAction: "review",
|
|
policyVersion: "default-2026-05-30",
|
|
evidence: [],
|
|
}));
|
|
}
|
|
}
|
|
|
|
return { results: parsed, raw: result };
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Text-only fast path — with batch size splitting (R6)
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Run a lightweight batch analysis on text-only messages.
|
|
*
|
|
* If targets exceed AI_LLM_TEXT_BATCH_SIZE, split into sub-batches
|
|
* and run sequentially to avoid overwhelming the LLM (R6).
|
|
*/
|
|
async function runTextOnlyBatch(
|
|
targets: MessageRecord[],
|
|
contextText: string,
|
|
): Promise<{ results: AnalysisResult[]; raw: unknown }> {
|
|
if (!targets.length) return { results: [], raw: null };
|
|
|
|
const maxBatchSize = config.AI_LLM_TEXT_BATCH_SIZE ?? 20;
|
|
const timeoutMs = config.AI_LLM_MEDIA_ANALYSIS_TIMEOUT_MS ?? 60000;
|
|
|
|
// Pre-compute text evidence (normalization + badword detection)
|
|
const textEvidenceMap = new Map<string, string>();
|
|
await Promise.all(
|
|
targets.map(async (msg) => {
|
|
const content = msg.edited_content ?? msg.content;
|
|
const evidence = formatModerationTextEvidenceForPrompt(content);
|
|
textEvidenceMap.set(msg.id, evidence);
|
|
}),
|
|
);
|
|
|
|
// ── Fetch web content from URLs in text-only messages ──
|
|
// Prevents LLM from guessing based on domain name alone (e.g., false "scam" flags).
|
|
// The fetched text content is injected into the message XML so the LLM can
|
|
// analyze the actual page rather than pattern-match the URL string.
|
|
const urlFetchMap = new Map<string, string>(); // url → fetched text content
|
|
{
|
|
const allUrls = new Set<string>();
|
|
for (const msg of targets) {
|
|
const content = msg.edited_content ?? msg.content;
|
|
for (const url of extractUrlsFromText(content)) {
|
|
allUrls.add(url);
|
|
}
|
|
}
|
|
const urlArr = Array.from(allUrls).slice(0, 10); // cap to 10 fetches per batch
|
|
if (urlArr.length > 0) {
|
|
log.debug(
|
|
{ urlCount: urlArr.length },
|
|
"Fetching web content for text-only batch URLs",
|
|
);
|
|
const results = await Promise.allSettled(
|
|
urlArr.map((url) => fetchUrlSafely(url)),
|
|
);
|
|
for (let i = 0; i < urlArr.length; i++) {
|
|
const r = results[i];
|
|
if (
|
|
r.status === "fulfilled" &&
|
|
r.value.type === "text" &&
|
|
r.value.textContent
|
|
) {
|
|
urlFetchMap.set(urlArr[i], r.value.textContent);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// ── Group identical short messages (< 20 chars) to reduce redundant analysis ──
|
|
// Messages with identical normalized content share a single representative.
|
|
// Results are fanned out to all group members after the LLM call.
|
|
const shortContentGroups = new Map<string, MessageRecord[]>();
|
|
const deduplicatedTargets: MessageRecord[] = [];
|
|
const groupMapping = new Map<string, string[]>(); // representativeId → [all memberIds]
|
|
|
|
for (const msg of targets) {
|
|
const rawContent = (msg.edited_content ?? msg.content).trim();
|
|
if (rawContent.length > 0 && rawContent.length < 20) {
|
|
const groupKey = rawContent.toLowerCase();
|
|
if (shortContentGroups.has(groupKey)) {
|
|
shortContentGroups.get(groupKey)!.push(msg);
|
|
} else {
|
|
shortContentGroups.set(groupKey, [msg]);
|
|
deduplicatedTargets.push(msg); // first occurrence = representative
|
|
}
|
|
} else {
|
|
deduplicatedTargets.push(msg);
|
|
}
|
|
}
|
|
|
|
// Build group mapping for results fan-out
|
|
for (const [, members] of shortContentGroups) {
|
|
if (members.length > 1) {
|
|
const rep = members[0];
|
|
groupMapping.set(
|
|
rep.id,
|
|
members.map((m) => m.id),
|
|
);
|
|
}
|
|
}
|
|
|
|
if (groupMapping.size > 0) {
|
|
log.debug(
|
|
{
|
|
originalCount: targets.length,
|
|
deduplicatedCount: deduplicatedTargets.length,
|
|
groupsFormed: groupMapping.size,
|
|
},
|
|
"Grouped identical short messages for text batch",
|
|
);
|
|
}
|
|
|
|
// Split into sub-batches if needed (R6) — using deduplicated targets
|
|
const subBatches: MessageRecord[][] = [];
|
|
for (let i = 0; i < deduplicatedTargets.length; i += maxBatchSize) {
|
|
subBatches.push(deduplicatedTargets.slice(i, i + maxBatchSize));
|
|
}
|
|
|
|
if (subBatches.length > 1) {
|
|
log.debug(
|
|
{
|
|
totalTargets: targets.length,
|
|
subBatchCount: subBatches.length,
|
|
maxBatchSize,
|
|
},
|
|
"Text targets exceed batch size limit — splitting into sub-batches",
|
|
);
|
|
}
|
|
|
|
const allResults: AnalysisResult[] = [];
|
|
let lastRaw: unknown = null;
|
|
|
|
// Run sub-batches sequentially to avoid rate limits
|
|
for (let i = 0; i < subBatches.length; i++) {
|
|
const batch = subBatches[i];
|
|
const targetIds = batch.map((t) => t.id);
|
|
|
|
const buildContent = async (state: RetryState): Promise<string> => {
|
|
const correction = state.lastParseError
|
|
? {
|
|
error: state.lastParseError,
|
|
preview: state.lastInvalidContent?.slice(0, 800) ?? "<empty>",
|
|
}
|
|
: undefined;
|
|
|
|
// Use modular system prompt with XML delimiters (R1, R7, R8)
|
|
const correctedExamples = await buildCorrectedFewShotExamples();
|
|
const systemText = buildSystemPromptModular({
|
|
contextText,
|
|
mode: "text",
|
|
correction,
|
|
correctedExamples,
|
|
});
|
|
|
|
const messagesBlock = batch
|
|
.map((msg) => {
|
|
const content = getAnalysisContent(msg);
|
|
const textEvidence = textEvidenceMap.get(msg.id) ?? "";
|
|
const textContext = textEvidence ? `\n${textEvidence}` : "";
|
|
|
|
// Inject fetched web content for URLs found in this message
|
|
const msgUrls = extractUrlsFromText(content);
|
|
const urlContexts = msgUrls
|
|
.map((url) => {
|
|
const fetchedText = urlFetchMap.get(url);
|
|
if (!fetchedText) return null;
|
|
return `<web_content url="${url}">${fetchedText}</web_content>`;
|
|
})
|
|
.filter(Boolean)
|
|
.join("\n");
|
|
const webContext = urlContexts ? `\n${urlContexts}` : "";
|
|
|
|
// XML delimiters wrap each message for prompt safety (R1)
|
|
return `<message id="${msg.id}" user="${msg.username}">${content}${textContext}${webContext}</message>`;
|
|
})
|
|
.join("\n");
|
|
|
|
// XML delimiter wraps the entire messages block (R1)
|
|
return `${systemText}\n\n<messages_to_analyze>\n${messagesBlock}\n</messages_to_analyze>`;
|
|
};
|
|
|
|
const batchResult = (await Promise.race([
|
|
callModerationLLM(buildContent, targetIds, `text-batch-${i + 1}`),
|
|
new Promise<{ results: AnalysisResult[]; raw: unknown }>((_, reject) => {
|
|
const timeout = setTimeout(
|
|
() =>
|
|
reject(
|
|
new Error(
|
|
`Text-only batch sub-batch ${i + 1} timed out for messages ${targetIds.join(", ")}`,
|
|
),
|
|
),
|
|
timeoutMs,
|
|
);
|
|
timeout.unref();
|
|
}),
|
|
])) as { results: AnalysisResult[]; raw: unknown };
|
|
|
|
const rawUsage = (
|
|
batchResult.raw as {
|
|
usage?: {
|
|
prompt_tokens: number;
|
|
completion_tokens: number;
|
|
total_tokens: number;
|
|
};
|
|
}
|
|
)?.usage;
|
|
// Fan-out results from representative messages to all group members
|
|
const fannedOutResults =
|
|
groupMapping.size > 0
|
|
? batchResult.results.flatMap((result) => {
|
|
const members = groupMapping.get(result.messageId);
|
|
if (members) {
|
|
return members.map((memberId) => ({
|
|
...result,
|
|
messageId: memberId,
|
|
}));
|
|
}
|
|
return [result];
|
|
})
|
|
: batchResult.results;
|
|
allResults.push(...fannedOutResults);
|
|
if (batchResult.raw) lastRaw = batchResult.raw;
|
|
|
|
// Log batch results with comprehensive details
|
|
logModerationAnalysis(
|
|
targetIds,
|
|
config.AI_LLM_MODEL,
|
|
batchResult.results,
|
|
0, // Duration will be tracked at higher level
|
|
rawUsage
|
|
? {
|
|
prompt_tokens: rawUsage.prompt_tokens,
|
|
completion_tokens: rawUsage.completion_tokens,
|
|
total_tokens: rawUsage.total_tokens,
|
|
}
|
|
: undefined,
|
|
);
|
|
}
|
|
|
|
log.debug(
|
|
{
|
|
targetCount: targets.length,
|
|
resultCount: allResults.length,
|
|
subBatchCount: subBatches.length,
|
|
},
|
|
"Text-only batch analysis complete",
|
|
);
|
|
|
|
return { results: allResults, raw: lastRaw };
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Single media message analysis — one LLM call per message with vision + timeout (R4, R5)
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Process a single media-bearing message:
|
|
* 1. Download attachment images (resized via sharp — R5)
|
|
* 2. Fetch URLs found in the message body
|
|
* 3. Download sticker/embed images (resized via sharp — R5)
|
|
* 4. Run vision analysis on every image (with DB + sticker cache)
|
|
* 5. Build a single-message prompt with XML delimiters (R1)
|
|
* 6. One LLM call → single AnalysisResult
|
|
*
|
|
* Wrapped with overall timeout (R4).
|
|
*/
|
|
async function runSingleMediaAnalysis(
|
|
target: MessageRecord,
|
|
contextText: string,
|
|
allAttachments: AttachmentRecord[] | undefined,
|
|
): Promise<{ results: AnalysisResult[]; raw: unknown }> {
|
|
const targetId = target.id;
|
|
const targetIds = [targetId];
|
|
|
|
// Timeout wrapper (R4)
|
|
const timeoutMs = config.AI_LLM_MEDIA_ANALYSIS_TIMEOUT_MS ?? 60000;
|
|
|
|
return Promise.race([
|
|
_runSingleMediaAnalysis(
|
|
target,
|
|
contextText,
|
|
allAttachments,
|
|
targetId,
|
|
targetIds,
|
|
),
|
|
new Promise<{ results: AnalysisResult[]; raw: unknown }>((_, reject) => {
|
|
const timeout = setTimeout(
|
|
() =>
|
|
reject(
|
|
new Error(
|
|
`Media analysis timed out after ${timeoutMs}ms for message ${targetId}`,
|
|
),
|
|
),
|
|
timeoutMs,
|
|
);
|
|
timeout.unref();
|
|
}),
|
|
]);
|
|
}
|
|
|
|
async function _runSingleMediaAnalysis(
|
|
target: MessageRecord,
|
|
contextText: string,
|
|
allAttachments: AttachmentRecord[] | undefined,
|
|
targetId: string,
|
|
targetIds: string[],
|
|
): Promise<{ results: AnalysisResult[]; raw: unknown }> {
|
|
// Lazy init sticker cache
|
|
if (!isStickerCacheReady()) {
|
|
await initStickerCache().catch((err: unknown) => {
|
|
log.warn(
|
|
{ error: err instanceof Error ? err.message : String(err) },
|
|
"Sticker cache init failed — continuing without cache",
|
|
);
|
|
});
|
|
}
|
|
|
|
// ── State maps for this single message ──
|
|
const imageMap = new Map<string, MessageImagePart[]>();
|
|
const webTextMap = new Map<string, string[]>();
|
|
const mediaAnalysisMap = new Map<string, string[]>();
|
|
|
|
const getAttachmentImageUrl = (att: AttachmentRecord): string | null =>
|
|
att.uploaded_url ?? att.discord_url ?? null;
|
|
|
|
const maxDimension = config.AI_LLM_IMAGE_MAX_DIMENSION ?? 1024;
|
|
const content = getAnalysisContent(target);
|
|
|
|
// ── 1-3. Parallel download of ALL media sources ──
|
|
// Build all download promises upfront and execute them in one Promise.all.
|
|
// Attachment, URL, sticker/emoji downloads are fully independent of each other.
|
|
// An 8-image cap is enforced across all sources combined.
|
|
|
|
const downloadPromises: Array<Promise<void>> = [];
|
|
|
|
// ── Attachment downloads ──
|
|
const msgAttachments = (allAttachments ?? [])
|
|
.filter(
|
|
(att) =>
|
|
att.message_id === targetId &&
|
|
getAttachmentImageUrl(att) &&
|
|
att.type.startsWith("image/"),
|
|
)
|
|
.slice(0, 8);
|
|
|
|
for (const att of msgAttachments) {
|
|
downloadPromises.push(
|
|
(async () => {
|
|
const urlToUse = getAttachmentImageUrl(att);
|
|
if (!urlToUse) {
|
|
log.warn(
|
|
{ attachmentId: att.id, messageId: att.message_id },
|
|
"Skipping attachment: no uploaded URL available",
|
|
);
|
|
return;
|
|
}
|
|
|
|
const controller = new AbortController();
|
|
const timeoutId = setTimeout(() => controller.abort(), 15000);
|
|
|
|
try {
|
|
const res = await fetch(urlToUse, { signal: controller.signal });
|
|
if (!res.ok || !res.body) {
|
|
log.warn(
|
|
{ attachmentId: att.id, url: urlToUse, status: res.status },
|
|
"Failed to download attachment: HTTP error or no body",
|
|
);
|
|
return;
|
|
}
|
|
|
|
let totalBytes = 0;
|
|
const chunks: Uint8Array[] = [];
|
|
const reader = res.body.getReader();
|
|
|
|
while (true) {
|
|
const { done, value } = await reader.read();
|
|
if (done) break;
|
|
if (value) {
|
|
totalBytes += value.length;
|
|
if (totalBytes > 10 * 1024 * 1024) {
|
|
log.warn(
|
|
{ attachmentId: att.id, totalBytes },
|
|
"Attachment too large (>10MB) — skipping",
|
|
);
|
|
reader.cancel();
|
|
return;
|
|
}
|
|
chunks.push(value);
|
|
}
|
|
}
|
|
|
|
const imageBytes = Buffer.concat(chunks);
|
|
const sniffedMime = sniffImageMimeType(imageBytes);
|
|
if (!sniffedMime) {
|
|
log.warn(
|
|
{ attachmentId: att.id },
|
|
"Skipping attachment: not a recognised image format",
|
|
);
|
|
return;
|
|
}
|
|
|
|
const { data: resizedBuffer, mimeType: resizedMime } =
|
|
await resizeImageForVision(imageBytes, maxDimension);
|
|
|
|
const dataUrl = `data:${resizedMime};base64,${resizedBuffer.toString("base64")}`;
|
|
const part: MessageImagePart = {
|
|
type: "image_url",
|
|
image_url: { url: dataUrl },
|
|
sourceLabel: `[gambar di atas adalah attachment ${att.filename} dari pesan id=${att.message_id}]`,
|
|
};
|
|
const existing = imageMap.get(targetId) ?? [];
|
|
if (existing.length < 8) {
|
|
existing.push(part);
|
|
imageMap.set(targetId, existing);
|
|
}
|
|
} catch (err) {
|
|
log.warn(
|
|
{
|
|
attachmentId: att.id,
|
|
error: err instanceof Error ? err.message : String(err),
|
|
},
|
|
"Error downloading attachment",
|
|
);
|
|
} finally {
|
|
clearTimeout(timeoutId);
|
|
}
|
|
})(),
|
|
);
|
|
}
|
|
|
|
// ── URL fetch promises ──
|
|
const urls = extractUrlsFromText(content).slice(0, 3);
|
|
const urlWebTexts: string[] = [];
|
|
|
|
for (const url of urls) {
|
|
downloadPromises.push(
|
|
(async () => {
|
|
const result = await fetchUrlSafely(url);
|
|
if (result.type === "image" && result.data && result.mimeType) {
|
|
const { data: resizedBuffer, mimeType: resizedMime } =
|
|
await resizeImageForVision(result.data, maxDimension);
|
|
|
|
const dataUrl = `data:${resizedMime};base64,${resizedBuffer.toString("base64")}`;
|
|
const part: MessageImagePart = {
|
|
type: "image_url",
|
|
image_url: { url: dataUrl },
|
|
sourceLabel: `[gambar di atas berasal dari link ${url} pada pesan id=${targetId}]`,
|
|
};
|
|
const existing = imageMap.get(targetId) ?? [];
|
|
if (existing.length < 8) {
|
|
existing.push(part);
|
|
imageMap.set(targetId, existing);
|
|
}
|
|
} else if (result.type === "text" && result.textContent) {
|
|
urlWebTexts.push(`[Isi Web dari ${url}]: ${result.textContent}`);
|
|
}
|
|
})(),
|
|
);
|
|
}
|
|
|
|
// ── Sticker / embed / custom emoji download promises ──
|
|
const mediaEvidence = extractMessageMediaEvidence(target.metadata);
|
|
const mediaCandidates: Array<{
|
|
messageId: string;
|
|
url: string;
|
|
label: string;
|
|
stickerName?: string;
|
|
customEmojiId?: string;
|
|
customEmojiName?: string;
|
|
}> = [
|
|
...mediaEvidence.stickers
|
|
.filter((s) => s.url)
|
|
.map((s) => ({
|
|
messageId: targetId,
|
|
url: s.url,
|
|
label: `[gambar di atas adalah sticker "${s.name}" dari pesan id=${targetId}]`,
|
|
stickerName: s.name,
|
|
})),
|
|
...mediaEvidence.embeds.flatMap((embed) =>
|
|
[
|
|
embed.image
|
|
? {
|
|
messageId: targetId,
|
|
url: embed.image,
|
|
label: `[gambar di atas berasal dari embed image pada pesan id=${targetId}]`,
|
|
}
|
|
: null,
|
|
embed.thumbnail
|
|
? {
|
|
messageId: targetId,
|
|
url: embed.thumbnail,
|
|
label: `[gambar di atas berasal dari embed thumbnail pada pesan id=${targetId}]`,
|
|
}
|
|
: null,
|
|
].filter(
|
|
(
|
|
c,
|
|
): c is {
|
|
messageId: string;
|
|
url: string;
|
|
label: string;
|
|
stickerName?: string;
|
|
customEmojiId?: string;
|
|
customEmojiName?: string;
|
|
} => c !== null,
|
|
),
|
|
),
|
|
...mediaEvidence.customEmojis.map((emoji) => ({
|
|
messageId: targetId,
|
|
url: emoji.url,
|
|
label: `[gambar di atas adalah custom emoji "${emoji.name}" dari pesan id=${targetId}]`,
|
|
customEmojiId: emoji.id,
|
|
customEmojiName: emoji.name,
|
|
})),
|
|
];
|
|
|
|
for (const candidate of mediaCandidates) {
|
|
downloadPromises.push(
|
|
(async () => {
|
|
// Skip if we already have 8 images
|
|
if ((imageMap.get(targetId)?.length ?? 0) >= 8) return;
|
|
|
|
// Vision cache check before download (sticker & emoji keys only, since
|
|
// their cache keys are consistent between check and store — embed URLs
|
|
// use base64 data URL keys that never match the CDN URL).
|
|
if (candidate.customEmojiId || candidate.stickerName) {
|
|
const visionCacheKey = candidate.customEmojiId
|
|
? makeCustomEmojiCacheKey(candidate.customEmojiId)
|
|
: makeStickerCacheKey(candidate.stickerName!);
|
|
const cachedVision = await getCachedMediaAnalysis(visionCacheKey);
|
|
if (cachedVision) {
|
|
log.debug(
|
|
{ cacheKey: visionCacheKey },
|
|
"Vision cache HIT for media candidate — skipped download",
|
|
);
|
|
const analysisText = `[Media analysis for message ${candidate.messageId}] ${candidate.label}: ${cachedVision}`;
|
|
const existing = mediaAnalysisMap.get(targetId) ?? [];
|
|
existing.push(analysisText);
|
|
mediaAnalysisMap.set(targetId, existing);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Sticker download cache
|
|
if (candidate.stickerName && isStickerCacheReady()) {
|
|
try {
|
|
const cached = await getStickerFromCache(candidate.stickerName);
|
|
if (cached) {
|
|
const part: MessageImagePart = {
|
|
type: "image_url",
|
|
image_url: {
|
|
url: `data:${cached.mimeType};base64,${cached.base64}`,
|
|
},
|
|
sourceLabel: candidate.label,
|
|
stickerName: candidate.stickerName,
|
|
};
|
|
const existing = imageMap.get(targetId) ?? [];
|
|
if (existing.length < 8) {
|
|
existing.push(part);
|
|
imageMap.set(targetId, existing);
|
|
}
|
|
return;
|
|
}
|
|
} catch (stickerErr) {
|
|
log.warn(
|
|
{
|
|
stickerName: candidate.stickerName,
|
|
error:
|
|
stickerErr instanceof Error
|
|
? stickerErr.message
|
|
: String(stickerErr),
|
|
},
|
|
"Sticker cache lookup failed — falling through to network fetch",
|
|
);
|
|
}
|
|
}
|
|
|
|
const result = await fetchUrlSafely(candidate.url);
|
|
if (result.type !== "image" || !result.data || !result.mimeType) {
|
|
log.warn(
|
|
{
|
|
url: candidate.url,
|
|
resultType: result.type,
|
|
resultHasData: !!result.data,
|
|
messageId: candidate.messageId,
|
|
label: candidate.stickerName
|
|
? `sticker:${candidate.stickerName}`
|
|
: candidate.customEmojiName
|
|
? `emoji:${candidate.customEmojiName}`
|
|
: "embed/other",
|
|
},
|
|
"Media candidate fetch did not return a usable image — skipping",
|
|
);
|
|
return;
|
|
}
|
|
|
|
const { data: resizedBuffer, mimeType: resizedMime } =
|
|
await resizeImageForVision(result.data, maxDimension);
|
|
|
|
const base64 = resizedBuffer.toString("base64");
|
|
if (candidate.stickerName) {
|
|
setStickerInCache(candidate.stickerName, base64, resizedMime).catch(
|
|
() => {},
|
|
);
|
|
}
|
|
|
|
const part: MessageImagePart = {
|
|
type: "image_url",
|
|
image_url: { url: `data:${resizedMime};base64,${base64}` },
|
|
sourceLabel: candidate.label,
|
|
stickerName: candidate.stickerName,
|
|
customEmojiId: candidate.customEmojiId,
|
|
customEmojiName: candidate.customEmojiName,
|
|
};
|
|
const existing = imageMap.get(targetId) ?? [];
|
|
if (existing.length < 8) {
|
|
existing.push(part);
|
|
imageMap.set(targetId, existing);
|
|
}
|
|
})(),
|
|
);
|
|
}
|
|
|
|
// Execute ALL media downloads in parallel
|
|
await Promise.all(downloadPromises);
|
|
|
|
// Collect web text results from URL fetches
|
|
if (urlWebTexts.length > 0) webTextMap.set(targetId, urlWebTexts);
|
|
|
|
// ── 4. Vision analysis for every image ──
|
|
await Promise.all(
|
|
Array.from(imageMap.entries()).flatMap(([msgId, images]) =>
|
|
images.map(async (image) => {
|
|
const summary = await analyzeSingleMediaImage(msgId, image);
|
|
// summary is never null — always returns either the analysis or a failure description
|
|
const existing = mediaAnalysisMap.get(msgId) ?? [];
|
|
existing.push(summary);
|
|
mediaAnalysisMap.set(msgId, existing);
|
|
}),
|
|
),
|
|
);
|
|
|
|
// ── 5. Build single-message prompt with XML delimiters (R1) ──
|
|
const textEvidence = formatModerationTextEvidenceForPrompt(content);
|
|
|
|
const webTexts = webTextMap.get(targetId) ?? [];
|
|
const mediaAnalyses = mediaAnalysisMap.get(targetId) ?? [];
|
|
const webContext = webTexts.length > 0 ? `\n${webTexts.join("\n")}` : "";
|
|
const textContext = textEvidence ? `\n${textEvidence}` : "";
|
|
const mediaAnalysisContext =
|
|
mediaAnalyses.length > 0 ? `\n${mediaAnalyses.join("\n")}` : "";
|
|
|
|
const mediaContext = [
|
|
mediaEvidence.stickers.length > 0
|
|
? mediaEvidence.stickers
|
|
.map((s) => buildStickerTextOnlyWarning(s.name, s.url))
|
|
.join(" ")
|
|
: null,
|
|
mediaEvidence.embeds.length > 0
|
|
? `[embed evidence: ${mediaEvidence.embeds
|
|
.map((e) =>
|
|
[e.title, e.description, e.url, e.image, e.thumbnail]
|
|
.filter(Boolean)
|
|
.join(" | "),
|
|
)
|
|
.join(" || ")}]`
|
|
: null,
|
|
]
|
|
.filter(Boolean)
|
|
.join(" ");
|
|
|
|
// XML delimiters wrap the message content (R1)
|
|
const messageBlock = `<message id="${target.id}" user="${target.username}">${content}${mediaContext ? ` ${mediaContext}` : ""}${textContext}${webContext}${mediaAnalysisContext}</message>`;
|
|
|
|
// Modular system prompt with XML delimiters (R1, R7, R8)
|
|
const correctedExamples = await buildCorrectedFewShotExamples();
|
|
const systemText = buildSystemPromptModular({
|
|
contextText,
|
|
mode: "mixed",
|
|
correctedExamples,
|
|
});
|
|
|
|
const userContent = `${systemText}\n\n<messages_to_analyze>\n${messageBlock}\n</messages_to_analyze>`;
|
|
|
|
// ── 6. LLM call ──
|
|
const result = await callModerationLLM(
|
|
async (_state: RetryState) => userContent,
|
|
targetIds,
|
|
`media:${targetId}`,
|
|
);
|
|
|
|
return result;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Main entry point — splits text-only vs media, runs both paths in parallel
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Runs LLM-based moderation analysis on messages.
|
|
*
|
|
* Architecture:
|
|
* - **Text-only messages** → single batch LLM call (fast, no image processing)
|
|
* - Split into sub-batches if exceeding AI_LLM_TEXT_BATCH_SIZE (R6)
|
|
* - **Media messages** → each gets its own LLM call with vision API (R5: resized images)
|
|
* - Both paths execute **in parallel** — text batch does NOT wait for media.
|
|
* - All LLM calls go through concurrency limiter (R3).
|
|
*/
|
|
export async function runModerationAnalysis(
|
|
input: ModerationInput,
|
|
): Promise<ModerationOutput> {
|
|
const { targets, contextText, attachments } = input;
|
|
|
|
if (!targets.length) {
|
|
throw new Error("No targets provided for analysis");
|
|
}
|
|
|
|
// ── Per-user moderation cache check ──
|
|
// For text-only messages: check if we've already analyzed the same
|
|
// (user, content) pair within the last 24 hours. If so, reuse the
|
|
// cached result to save LLM calls (especially for repeat spam).
|
|
const cacheHits: AnalysisResult[] = [];
|
|
const uncachedTargets: MessageRecord[] = [];
|
|
const seenCacheKeys = new Set<string>(); // dedupe identical content within same batch
|
|
|
|
for (const target of targets) {
|
|
// Only cache text-only messages (media has dynamic image fetches)
|
|
const hasMedia = hasMediaContent(target, attachments);
|
|
if (hasMedia) {
|
|
uncachedTargets.push(target);
|
|
continue;
|
|
}
|
|
|
|
const rawContent = target.edited_content ?? target.content;
|
|
if (!rawContent.trim()) {
|
|
uncachedTargets.push(target);
|
|
continue;
|
|
}
|
|
|
|
const cacheKey = makeUserModerationCacheKey(target.user_id, rawContent);
|
|
// Deduplicate: if two identical messages from same user in this batch,
|
|
// skip the cache lookup for the second and reuse the first's result.
|
|
if (seenCacheKeys.has(cacheKey)) {
|
|
// Synthesize a copy of the previous cache hit result for this duplicate
|
|
const previousHit = cacheHits.find((h) => h.messageId !== target.id);
|
|
if (previousHit) {
|
|
cacheHits.push({
|
|
...previousHit,
|
|
messageId: target.id,
|
|
});
|
|
} else {
|
|
uncachedTargets.push(target);
|
|
}
|
|
continue;
|
|
}
|
|
seenCacheKeys.add(cacheKey);
|
|
|
|
try {
|
|
const cached = await getCachedUserModeration(cacheKey);
|
|
if (cached) {
|
|
// Safety: skip cache entries that are artifacts of API/parse errors.
|
|
// A previous bug cached error results as "flagged", causing 24h false positives.
|
|
// This guards against both legacy corrupt entries and any future write-path bugs.
|
|
if (
|
|
cached.flags.some((f) =>
|
|
[
|
|
"analysis_api_failed",
|
|
"analysis_parse_failed",
|
|
"analysis_incomplete",
|
|
].includes(f),
|
|
)
|
|
) {
|
|
log.warn(
|
|
{ messageId: target.id, cacheKey },
|
|
"Cache entry contains error artifact — treating as miss",
|
|
);
|
|
} else {
|
|
cacheHits.push({
|
|
messageId: target.id,
|
|
status: cached.status,
|
|
flags: cached.flags,
|
|
score: cached.score,
|
|
analysis: cached.analysis,
|
|
categories: cached.categories,
|
|
severity: cached.severity as AnalysisResult["severity"],
|
|
confidence: cached.confidence,
|
|
recommendedAction:
|
|
cached.recommendedAction as AnalysisResult["recommendedAction"],
|
|
policyVersion: "cached-user-moderation-2026-06",
|
|
evidence: [],
|
|
});
|
|
log.debug(
|
|
{ messageId: target.id, userId: target.user_id, cacheKey },
|
|
"User moderation cache HIT — reusing previous result",
|
|
);
|
|
continue;
|
|
}
|
|
}
|
|
} catch {
|
|
// Cache lookup failed — proceed with uncached path
|
|
}
|
|
|
|
uncachedTargets.push(target);
|
|
}
|
|
|
|
if (cacheHits.length > 0) {
|
|
log.info(
|
|
{
|
|
cacheHits: cacheHits.length,
|
|
uncached: uncachedTargets.length,
|
|
total: targets.length,
|
|
},
|
|
"User moderation cache applied — skipping LLM call for cached targets",
|
|
);
|
|
}
|
|
|
|
// If all targets were cache hits, return early
|
|
if (uncachedTargets.length === 0) {
|
|
return { results: cacheHits, raw: null };
|
|
}
|
|
|
|
// ── Split uncached targets ──
|
|
const textOnlyTargets: MessageRecord[] = [];
|
|
const mediaTargets: MessageRecord[] = [];
|
|
|
|
for (const target of uncachedTargets) {
|
|
if (hasMediaContent(target, attachments)) {
|
|
mediaTargets.push(target);
|
|
} else {
|
|
textOnlyTargets.push(target);
|
|
}
|
|
}
|
|
|
|
log.debug(
|
|
{
|
|
total: targets.length,
|
|
textOnly: textOnlyTargets.length,
|
|
media: mediaTargets.length,
|
|
cacheHits: cacheHits.length,
|
|
},
|
|
"Split uncached targets for parallel moderation analysis",
|
|
);
|
|
|
|
// ── Run both paths in parallel ──
|
|
const [textBatchResult, ...mediaResults] = await Promise.all([
|
|
// Text-only: one fast batch call (or multiple sub-batches)
|
|
textOnlyTargets.length > 0
|
|
? runTextOnlyBatch(textOnlyTargets, contextText)
|
|
: Promise.resolve({ results: [] as AnalysisResult[], raw: null }),
|
|
|
|
// Media: each message gets its own LLM call (all in parallel, but limited by semaphore — R3)
|
|
...mediaTargets.map((target) =>
|
|
runSingleMediaAnalysis(target, contextText, attachments),
|
|
),
|
|
]);
|
|
|
|
// ── Store uncached text-only results in cache ──
|
|
const textResults = textBatchResult.results;
|
|
for (const result of textResults) {
|
|
const target = textOnlyTargets.find((t) => t.id === result.messageId);
|
|
if (!target) continue;
|
|
|
|
const rawContent = target.edited_content ?? target.content;
|
|
if (!rawContent.trim()) continue;
|
|
|
|
// Do NOT cache error results (API failures, parse failures, incomplete).
|
|
// Caching a transient error would turn it into a 24h false positive.
|
|
if (result.status === "error") continue;
|
|
|
|
const cacheKey = makeUserModerationCacheKey(target.user_id, rawContent);
|
|
setCachedUserModeration(cacheKey, {
|
|
flags: result.flags ?? [],
|
|
score: result.score ?? 0,
|
|
analysis: result.analysis ?? "",
|
|
categories: result.categories ?? result.flags ?? [],
|
|
severity: result.severity ?? "none",
|
|
confidence: result.confidence ?? result.score ?? 0,
|
|
recommendedAction: result.recommendedAction ?? "none",
|
|
status: result.status,
|
|
}).catch(() => {});
|
|
}
|
|
|
|
// ── Merge cache hits + new results ──
|
|
const allResults = [
|
|
...cacheHits,
|
|
...textResults,
|
|
...mediaResults.flatMap((r) => r.results),
|
|
];
|
|
|
|
const raw =
|
|
textBatchResult.raw ??
|
|
(mediaResults.length > 0 ? mediaResults[0].raw : null);
|
|
|
|
log.debug(
|
|
{
|
|
targetCount: targets.length,
|
|
resultCount: allResults.length,
|
|
cacheHits: cacheHits.length,
|
|
textBatchResults: textResults.length,
|
|
mediaResults: mediaResults.length,
|
|
},
|
|
"Moderation analysis complete",
|
|
);
|
|
|
|
return { results: allResults, raw };
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Simple text-only fallback — uses a MINIMAL prompt that returns a single
|
|
// word ("clean", "warn", or "flagged") instead of a complex JSON object.
|
|
//
|
|
// This is designed for cheap/small models that struggle with:
|
|
// 1. Multi-target JSON output (confusing message_ids)
|
|
// 2. Complex JSON schema compliance (9+ fields)
|
|
//
|
|
// Trade-off: less detail (no flags/evidence/categories), but ZERO parse
|
|
// errors and much faster. Field values are derived heuristically.
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Simple two-step text fallback for cheap/small models.
|
|
*
|
|
* Step 1: Ask the LLM for a single-word classification (clean/warn/flagged).
|
|
* Step 2: If not clean, ask the LLM again for a real reason — no dummy text.
|
|
*
|
|
* NO JSON at either step. Just raw text that we parse by simple rules.
|
|
*/
|
|
export async function runSimpleTextFallback(
|
|
message: MessageRecord,
|
|
): Promise<AnalysisResult> {
|
|
const content = getAnalysisContent(message);
|
|
const MAX_CONTENT_CHARS = 500;
|
|
const truncatedContent =
|
|
content.length > MAX_CONTENT_CHARS
|
|
? content.slice(0, MAX_CONTENT_CHARS) + "..."
|
|
: content;
|
|
|
|
// ── Step 1: Single-word classification ──
|
|
const classifyPrompt = `Pesan berikut perlu diklasifikasikan sebagai: clean, warn, atau flagged.
|
|
|
|
Aturan:
|
|
- clean: pesan biasa, percakapan normal, tidak ada pelanggaran
|
|
- warn: spam ringan, promosi tidak jelas, atau pelanggaran ringan
|
|
- flagged: harassment, SARA, NSFW, judi, ancaman, atau pelanggaran serius
|
|
|
|
PENTING: Slang Indonesia ("anjay", "wkwk", "njir", "gws", dll) dan makian umum ("asu", "anjing", "bangsat") yang TIDAK ditujukan ke orang lain = clean.
|
|
|
|
Pesan: "${truncatedContent}"
|
|
|
|
Jawab HANYA dengan satu kata: clean, warn, atau flagged`;
|
|
|
|
let status: "clean" | "warn" | "flagged";
|
|
let rawClassify = "";
|
|
|
|
try {
|
|
const completion = await llmChat({
|
|
messages: [{ role: "user", content: classifyPrompt }],
|
|
max_tokens: 10,
|
|
temperature: 0.1,
|
|
});
|
|
|
|
rawClassify =
|
|
completion?.choices[0]?.message?.content?.trim().toLowerCase() ?? "";
|
|
|
|
if (rawClassify.includes("flagged")) {
|
|
status = "flagged";
|
|
} else if (rawClassify.includes("warn")) {
|
|
status = "warn";
|
|
} else {
|
|
status = "clean";
|
|
}
|
|
|
|
log.info(
|
|
{ messageId: message.id, status, raw: rawClassify },
|
|
"Simple fallback step 1 — classification",
|
|
);
|
|
} catch (error) {
|
|
log.warn(
|
|
{
|
|
messageId: message.id,
|
|
error: error instanceof Error ? error.message : String(error),
|
|
},
|
|
"Simple fallback step 1 failed — defaulting to clean",
|
|
);
|
|
status = "clean";
|
|
}
|
|
|
|
// ── Step 2: Real analysis text + category (only if not clean) ──
|
|
// We ask the LLM for a real reason and a category word — no complex JSON.
|
|
let analysis: string;
|
|
let category = "";
|
|
|
|
if (status === "clean") {
|
|
analysis = `${message.username ?? "user"}: ${content.length > 200 ? content.slice(0, 200) + "..." : content}. Percakapan normal, tidak ada pelanggaran.`;
|
|
} else {
|
|
category = status === "flagged" ? "harassment" : "spam"; // default fallback
|
|
const categoryOptions =
|
|
status === "flagged" ? "harassment, gambling, atau sara" : "spam";
|
|
const reasonPrompt = `Pesan berikut telah diklasifikasikan sebagai "${status}".
|
|
|
|
Pesan: "${truncatedContent}"
|
|
|
|
Jelaskan dalam 1-2 kalimat Bahasa Indonesia: APA yang melanggar dan KENAPA. Jangan gunakan kata "mungkin" atau "sepertinya". Jangan tulis ulang pesan. Langsung ke alasan.
|
|
|
|
Setelah alasan, sebutkan Kategori: ${categoryOptions}
|
|
|
|
Contoh untuk "flagged":
|
|
Mengandung kata kasar terarah ke individu tertentu sebagai hinaan.
|
|
Kategori: harassment
|
|
|
|
Contoh untuk "flagged":
|
|
Promosi situs judi online dengan link dan ajakan.
|
|
Kategori: gambling
|
|
|
|
Contoh untuk "warn":
|
|
Promosi channel Discord tanpa konteks, berpotensi spam.
|
|
Kategori: spam
|
|
|
|
Contoh untuk "warn":
|
|
Bahasa kasar ringan yang tidak terarah.
|
|
Kategori: spam`;
|
|
|
|
try {
|
|
const completion = await llmChat({
|
|
messages: [{ role: "user", content: reasonPrompt }],
|
|
max_tokens: 80,
|
|
temperature: 0.3,
|
|
});
|
|
|
|
analysis = completion?.choices[0]?.message?.content?.trim() ?? "";
|
|
|
|
// Guard against empty or non-answers
|
|
if (!analysis || analysis.length < 5) {
|
|
analysis = `Pesan diklasifikasikan sebagai ${status} oleh sistem moderasi otomatis.`;
|
|
}
|
|
|
|
// ── Parse category from "Kategori: xxx" line ──
|
|
const categoryMatch = analysis.match(/[Kk]ategori:\s*(\w+)/i);
|
|
if (categoryMatch) {
|
|
const parsedCat = categoryMatch[1].toLowerCase();
|
|
// Only accept known categories
|
|
if (["harassment", "spam", "gambling", "sara"].includes(parsedCat)) {
|
|
category = parsedCat;
|
|
}
|
|
// Strip the "Kategori:" line from the analysis text so it's cleaner
|
|
analysis = analysis.replace(/[Kk]ategori:\s*\w+\s*/i, "").trim();
|
|
}
|
|
|
|
log.info(
|
|
{
|
|
messageId: message.id,
|
|
status,
|
|
category,
|
|
analysis: analysis.slice(0, 100),
|
|
},
|
|
"Simple fallback step 2 — reason + category",
|
|
);
|
|
} catch (error) {
|
|
analysis = `Pesan diklasifikasikan sebagai ${status} oleh sistem moderasi otomatis berdasarkan analisis konten.`;
|
|
log.warn(
|
|
{
|
|
messageId: message.id,
|
|
error: error instanceof Error ? error.message : String(error),
|
|
},
|
|
"Simple fallback step 2 failed — using fallback reason text",
|
|
);
|
|
}
|
|
}
|
|
|
|
// Build the result fields using parsed category
|
|
const flags: string[] = status === "clean" ? [] : [category];
|
|
const categories: string[] = status === "clean" ? [] : [category];
|
|
const score = status === "flagged" ? 0.7 : status === "warn" ? 0.4 : 0;
|
|
const severity: "none" | "low" | "medium" | "high" | "critical" =
|
|
status === "flagged" ? "medium" : status === "warn" ? "low" : "none";
|
|
const confidence = 0.6;
|
|
|
|
return {
|
|
messageId: message.id,
|
|
status,
|
|
flags,
|
|
score,
|
|
analysis,
|
|
categories,
|
|
severity,
|
|
confidence,
|
|
recommendedAction:
|
|
status === "flagged" ? "review" : status === "warn" ? "warn" : "none",
|
|
policyVersion: "default-simple-2026-06",
|
|
evidence:
|
|
status !== "clean"
|
|
? [content.length > 120 ? content.slice(0, 120) + "..." : content]
|
|
: [],
|
|
};
|
|
}
|