refactor: atomic, DRY, and logging improvements across codebase

- Split llmModerationClient.ts (2170 lines) into 5 focused sub-modules - Split aiAnalyzer.ts (1282 lines) into 4 modular pipelines - Split messages.db.ts (826 lines) into 5 domain-specific modules - Moved shared schema to @bete/shared, eliminated backend duplication - Added createChildLogger to all voice-recording and AI moderation modules - Extracted tryCommandThenFallback, normalizeMediaState, DEFAULT_VOICE_STATUS - Created shared pagination.ts utility, eliminated 5+ cursor-pagination duplications - Created shared messageMapper.ts for row mapping - Standardized backend error handling with asyncHandler - Added frontend createLogger utility and useAsyncAction hook - Added structured logging to frontend hooks, socket, and API client Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-09 19:46:08 +07:00
parent b68789fffc
commit 07032ab521
61 changed files with 3808 additions and 3043 deletions
@@ -0,0 +1,76 @@
+import { createChildLogger } from "@bete/shared/logger";
+
+const log = createChildLogger("imageMimeSniffer");
+
+/**
+ * Sniff the first bytes of a buffer to determine if it is a supported image
+ * format. Returns the canonical MIME type string on success, or null if the
+ * bytes are not a recognizable image.
+ */
+export function sniffImageMimeType(buf: Buffer): string | null {
+  if (buf.length < 12) return null;
+
+  if (buf[0] === 0xff && buf[1] === 0xd8 && buf[2] === 0xff) {
+    return "image/jpeg";
+  }
+
+  if (
+    buf[0] === 0x89 &&
+    buf[1] === 0x50 &&
+    buf[2] === 0x4e &&
+    buf[3] === 0x47 &&
+    buf[4] === 0x0d &&
+    buf[5] === 0x0a &&
+    buf[6] === 0x1a &&
+    buf[7] === 0x0a
+  ) {
+    return "image/png";
+  }
+
+  if (
+    buf[0] === 0x47 &&
+    buf[1] === 0x49 &&
+    buf[2] === 0x46 &&
+    buf[3] === 0x38
+  ) {
+    return "image/gif";
+  }
+
+  if (
+    buf[0] === 0x52 &&
+    buf[1] === 0x49 &&
+    buf[2] === 0x46 &&
+    buf[3] === 0x46 &&
+    buf[8] === 0x57 &&
+    buf[9] === 0x45 &&
+    buf[10] === 0x42 &&
+    buf[11] === 0x50
+  ) {
+    return "image/webp";
+  }
+
+  if (
+    buf.length >= 12 &&
+    buf[4] === 0x66 &&
+    buf[5] === 0x74 &&
+    buf[6] === 0x79 &&
+    buf[7] === 0x70
+  ) {
+    const brand = buf.subarray(8, 12).toString("ascii");
+    if (brand.startsWith("avif") || brand.startsWith("avis")) {
+      return "image/avif";
+    }
+    if (
+      brand.startsWith("mif1") ||
+      brand.startsWith("heic") ||
+      brand.startsWith("heis")
+    ) {
+      return "image/heic";
+    }
+  }
+
+  return null;
+}
+
+// Keep log referenced so TS does not tree-shake the logger init
+log.debug("imageMimeSniffer loaded");