src/handlers/webhookMessage.ts:751

• The Slack file ID validation logic with magic numbers ('F' prefix and length < 10) should be extracted to a named constant or validation function to improve maintainability and make the format requirements explicit.

        });

src/handlers/webhookMessage.ts (5)

1252-1259: Nice: fileNames now logged, linter satisfied and debug value improved

Using metadataFileNames fixes the unused var and adds useful observability. Approved.

---

1306-1325: Per-file MIME derivation implemented correctly

Deriving fileType from each file object fixes the earlier “first image/* wins” pitfall. This improves validation and forwarding accuracy.

---

877-883: Good hardening: filename escaped in caption

Escaping fileName before upload to Telegram avoids Markdown pitfalls. Well done.

---

1378-1385: Use detection service for metadataAvailable for consistency

Keep all attachment checks centralized via AttachmentDetectionService.hasAttachments(event), rather than reading event.attachments?.hasFiles directly.

-      metadataAvailable: !!event.attachments?.hasFiles,
+      metadataAvailable: AttachmentDetectionService.hasAttachments(event),

---

939-944: Escape fileName in rich captions

Caption includes raw fileName in bold. Escape it to avoid Markdown breakage and abuse.

-    const { fileName, fileSize, sendMethod, fileTypeEmoji } = params;
+    const { fileName, fileSize, sendMethod, fileTypeEmoji } = params;
     const sizeFormatted = this.formatFileSize(fileSize);
     const typeText = sendMethod === 'photo' ? 'Image' : 'Document';
     
-    return `${fileTypeEmoji} **${typeText} from Support Agent**\n\n📎 **${fileName}**\n📊 **Size:** ${sizeFormatted}`;
+    return `${fileTypeEmoji} **${typeText} from Support Agent**\n\n📎 **${escapeMarkdown(fileName)}**\n📊 **Size:** ${sizeFormatted}`;

src/handlers/webhookMessage.ts (2)

207-210: Prefer cached config over repeated getters

Reuse this.imageConfig to avoid redundant getImageProcessingConfig() calls and to ensure consistency if config is later hot-reloaded or wrapped.

-      const maxSizeBytes = getImageProcessingConfig().maxImageSize * getImageProcessingConfig().maxImagesPerBatch;
+      const maxSizeBytes = this.imageConfig.maxImageSize * this.imageConfig.maxImagesPerBatch;

And in logIntegrationStatus:

-    const maxSizeBytes = getImageProcessingConfig().maxImageSize * getImageProcessingConfig().maxImagesPerBatch;
+    const maxSizeBytes = this.imageConfig.maxImageSize * this.imageConfig.maxImagesPerBatch;

Also applies to: 1375-1377

---

1044-1069: Size limit message: use consistent human-readable formatter

You already pass the exact maxSizeBytes—prefer the same formatter you use elsewhere to avoid rounding quirks and keep UX consistent.

-    const maxSizeMB = Math.round(maxSizeBytes / (1024 * 1024));
-    const message = '📎 *Attachment Received*\n\n' +
-      `⚠️ Files are too large to process (${this.formatFileSize(totalSize)}). ` +
-      `Maximum size limit is ${maxSizeMB}MB.\n\n` +
+    const message = '📎 *Attachment Received*\n\n' +
+      `⚠️ Files are too large to process (${this.formatFileSize(totalSize)}). ` +
+      `Maximum size limit is ${this.formatFileSize(maxSizeBytes)}.\n\n` +
       'Your agent can still see and access all files in the dashboard.';

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

src/handlers/webhookMessage.ts (5)

869-972: End-to-end Slack → Telegram flow hardened; Markdown and reply semantics fixed

Downloading via Unthread’s thumbnail endpoint, escaping file names in captions, and using reply_to_message_id with safeSendMessage are all correct and consistent with prior guidance.

---

1089-1114: Size-limit message: use consistent human-readable formatting

You’ve aligned the decision and the message using the same maxSizeBytes (excellent). For clarity, display the exact limit via formatFileSize.

-    const maxSizeMB = Math.round(maxSizeBytes / (1024 * 1024));
+    const maxSizeText = this.formatFileSize(maxSizeBytes);
@@
-      `⚠️ Files are too large to process (${this.formatFileSize(totalSize)}). ` +
-      `Maximum size limit is ${maxSizeMB}MB.\n\n` +
+      `⚠️ Files are too large to process (${this.formatFileSize(totalSize)}). ` +
+      `Maximum size limit is ${maxSizeText}.\n\n` +
       'Your agent can still see and access all files in the dashboard.';

---

1292-1304: Linter fix confirmed: fileNames now used in debug payload

Including metadataFileNames resolves the unused variable and improves observability. Nicely done.

---

1352-1360: Broaden per-file MIME derivation for robustness

For metadata variance, fall back to mimeType or type when mimetype is absent. This keeps validation accurate across providers.

-      const fileType = (file.mimetype && typeof file.mimetype === 'string') 
-        ? String(file.mimetype).toLowerCase() 
-        : '';
+      const fileType = typeof (file as any).mimetype === 'string'
+        ? (file as any).mimetype.toLowerCase()
+        : typeof (file as any).mimeType === 'string'
+          ? (file as any).mimeType.toLowerCase()
+          : typeof (file as any).type === 'string'
+            ? (file as any).type.toLowerCase()
+            : '';

---

1420-1437: Align integration logger with detection service and cached config

Use the same metadata check used elsewhere and reuse this.imageConfig for the size limit to guarantee consistency.

-    const maxSizeBytes = getImageProcessingConfig().maxImageSize * getImageProcessingConfig().maxImagesPerBatch;
+    const maxSizeBytes = this.imageConfig.maxImageSize * this.imageConfig.maxImagesPerBatch;
@@
-      metadataAvailable: !!event.attachments?.hasFiles,
+      metadataAvailable: AttachmentDetectionService.hasAttachments(event),

src/handlers/webhookMessage.ts (4)

256-259: Reuse loaded imageConfig instead of re-calling getImageProcessingConfig()

Avoid recomputation and potential divergence; you already have this.imageConfig in the class.

-      const maxSizeBytes = getImageProcessingConfig().maxImageSize * getImageProcessingConfig().maxImagesPerBatch;
+      const maxSizeBytes = this.imageConfig.maxImageSize * this.imageConfig.maxImagesPerBatch;

---

984-989: Escape fileName in caption helper

The helper currently injects raw fileName into Markdown. Escape it to prevent formatting breaks.

-    const { fileName, fileSize, sendMethod, fileTypeEmoji } = params;
+    const { fileName, fileSize, sendMethod, fileTypeEmoji } = params;
+    const safeName = escapeMarkdown(fileName);
@@
-    return `${fileTypeEmoji} **${typeText} from Support Agent**\n\n📎 **${fileName}**\n📊 **Size:** ${sizeFormatted}`;
+    return `${fileTypeEmoji} **${typeText} from Support Agent**\n\n📎 **${safeName}**\n📊 **Size:** ${sizeFormatted}`;

---

1064-1083: Make “supported formats” message dynamic from configuration

Hardcoding PNG/JPEG/GIF/WebP can drift from ImageProcessingConfig.supportedFormats. Derive at runtime to keep UX accurate.

-    const message = '📎 *Attachment Received*\n\n' +
-      '⚠️ Some file types are not supported yet. Currently, only images (PNG, JPEG, GIF, WebP) can be processed.\n\n' +
-      'Your agent can still see and access all files in the dashboard.';
+    const formatsText = this.imageConfig.supportedFormats
+      .map(t => (t.split('/').pop()?.toUpperCase()) ?? t)
+      .join(', ');
+    const message = '📎 *Attachment Received*\n\n' +
+      `⚠️ Some file types are not supported yet. Currently, only images (${formatsText}) can be processed.\n\n` +
+      'Your agent can still see and access all files in the dashboard.';

---

1443-1487: Optional: strengthen typing for image file processing

processImageFile accepts file: any. Since you validate Slack IDs and sizes, consider typing this as SlackFile and narrowing before the call (reusing your existing isValidSlackFile) for compile-time guarantees.

-  private async processImageFile(params: {
+  private async processImageFile(params: {
     conversationId: string;
-    file: any;
+    file: SlackFile;
     fileName: string;
     fileType: string;
     chatId: number;
     replyToMessageId: number;
     fileIndex: number;
     totalFiles: number;
   }): Promise<void> {

And in the caller:

-      const file = files.at(i);
+      const file = files.at(i);
@@
-      // Validate file object for security
-      if (!file || typeof file !== 'object') {
+      // Validate file object for security and shape
+      if (!isValidSlackFile(file)) {
         LogEngine.warn('Skipping invalid file object', {
           conversationId,
           fileIndex: i + 1,
-          receivedType: typeof file
+          receivedType: typeof file,
+          validationFailed: true
         });
         continue;
       }

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

src/utils/attachmentHandler.ts (3)

882-889: Validate TELEGRAM_BOT_TOKEN before constructing the URL

Fail fast with a configuration error and avoid emitting requests with “botundefined”.

-        const telegramApiUrl = `https://api.telegram.org/bot${process.env.TELEGRAM_BOT_TOKEN}/getFile?file_id=${fileId}`;
+        const token = process.env.TELEGRAM_BOT_TOKEN;
+        if (!token) {
+            const processingError = createProcessingError(
+                AttachmentProcessingError.CONFIGURATION_ERROR,
+                'TELEGRAM_BOT_TOKEN is not set',
+                operationContext
+            );
+            throw new Error(processingError.message);
+        }
+        const telegramApiUrl = `https://api.telegram.org/bot${token}/getFile?file_id=${fileId}`;

---

891-897: Apply download timeout with AbortController

Use BUFFER_ATTACHMENT_CONFIG.downloadTimeout to enforce time-bound operations and surface NETWORK_TIMEOUT deterministically.

-            const fileResponse = await fetch(telegramApiUrl, {
+            const controller = new AbortController();
+            const timeoutId = setTimeout(() => controller.abort(), BUFFER_ATTACHMENT_CONFIG.downloadTimeout);
+            const fileResponse = await fetch(telegramApiUrl, {
                 method: 'GET',
                 headers: {
                     'User-Agent': 'unthread-telegram-bot/1.0'
-                }
+                },
+                signal: controller.signal
             });
+            clearTimeout(timeoutId);

Replicate the same pattern for all fetch calls (downloadFileContent, uploadBufferToUnthread, uploadBufferToTelegram, sendTelegramMediaGroup) using the corresponding timeout knob.

---

1052-1061: Avoid NaN misclassification when parsing Content-Length

If Content-Length is non-numeric, parseInt yields NaN and the validation wrongly fails. Guard the numeric conversion.

-        const contentLength = downloadResponse.headers.get('content-length');
-        if (contentLength && !this.validateFileSize(parseInt(contentLength), sanitizedFileName)) {
+        const contentLength = downloadResponse.headers.get('content-length');
+        const contentLengthNum = contentLength ? Number(contentLength) : undefined;
+        if (contentLengthNum && Number.isFinite(contentLengthNum) && !this.validateFileSize(contentLengthNum, sanitizedFileName)) {

src/utils/attachmentHandler.ts (1)

1114-1154: MIME allowlist check is precise and robust — approved

Exact/prefix matching (including image/*) avoids the false positives from naive includes(). Nicely done.

src/utils/attachmentHandler.ts (4)

236-260: Expand FILE_SIGNATURES for modern image formats (HEIC/AVIF)

Optional: add basic magic checks for HEIC/AVIF to improve buffer-level detection when headers are generic. This will reduce false negatives for iOS-origin photos.

Example extension:

 export const FILE_SIGNATURES = {
   ...
+  // HEIF/HEIC/AVIF (ISO Base Media File) – look for 'ftyp' then brand
+  'image/heic': [
+    // '....ftypheic' or '....ftypheix' etc. Check 'ftyp' at offset 4 and 'heic/heix/hevc/hevd' brand
+    // Implemented via buffer inspection logic in detectMimeTypeFromBuffer (see below refactor)
+  ],
+  'image/avif': [
+    // '....ftypavif' brand
+  ],
   ...
 };

If preferred, I can provide a concrete, efficient brand-check implementation inside detectMimeTypeFromBuffer.

---

339-376: BufferPool is currently unused

Either integrate acquire/release at buffer touchpoints or remove to avoid dead code and reduce cognitive load.

Offer: I can thread the pool through download/convert to avoid some allocations if you intend to keep it.

---

1260-1263: Avoid Array.prototype.at for broader Node compatibility

Small win: use index access for max compatibility (Node 14/16 without polyfills).

-            const fileId = fileIds.at(index);
+            const fileId = fileIds[index];

---

394-396: User-facing “10MB” message should reflect configured limit

Make the message dynamic so it never drifts from BUFFER_ATTACHMENT_CONFIG.maxFileSize.

-                return "📏 File too large. Please send a file smaller than 10MB.";
+                return `📏 File too large. Please send a file smaller than ${Math.round(BUFFER_ATTACHMENT_CONFIG.maxFileSize / (1024 * 1024))}MB.`;

Note: change in createProcessingError getUserMessage for FILE_TOO_LARGE.

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

src/utils/attachmentHandler.ts (4)

1058-1089: Apply download timeout with AbortController for file content

Mirror the getFileInfo timeout/abort for the actual file download. Prevents hangs and aligns with your retry logic.

-        const downloadResponse = await fetch(downloadUrl, {
-            headers: {
-                'User-Agent': 'UnthreadBot/5.0.0 (Enhanced-Error-Handling)'
-            }
-        });
+        const controller = new AbortController();
+        const timeoutId = setTimeout(() => controller.abort(), BUFFER_ATTACHMENT_CONFIG.downloadTimeout);
+        const downloadResponse = await fetch(downloadUrl, {
+            headers: {
+                'User-Agent': 'UnthreadBot/5.0.0 (Enhanced-Error-Handling)'
+            },
+            signal: controller.signal
+        });
+        clearTimeout(timeoutId);

---

1399-1408: Unthread upload: add timeout/abort and zeroize on all paths

• Abort long-running uploads with AbortController (Promise.race doesn’t cancel the request).
• Zeroize buffers in a finally block to guarantee cleanup on failures too.

-                const uploadResponse = await fetch(`${API_BASE_URL}/conversations/${conversationId}/messages`, {
+                const controller = new AbortController();
+                const timeoutId = setTimeout(() => controller.abort(), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
+                const uploadResponse = await fetch(`${API_BASE_URL}/conversations/${conversationId}/messages`, {
                     method: 'POST',
                     headers: {
                         'X-API-KEY': UNTHREAD_API_KEY,
                         'X-Request-ID': `telegram-bot-${conversationId}-${Date.now()}`,
                         ...formData.getHeaders()
                     },
-                    body: formData
+                    body: formData,
+                    signal: controller.signal
                 });
+                clearTimeout(timeoutId);
@@
-                // Security: Zero out buffer after upload
-                fileBuffer.buffer.fill(0);
+                // Security: Zero out buffer after upload
+                fileBuffer.buffer.fill(0);

Outside the withPerformanceMonitoring call:

-        const { result } = await withPerformanceMonitoring(async () => {
+        try {
+            const { result } = await withPerformanceMonitoring(async () => {
               /* ...unchanged... */
-        }, `uploadBufferToUnthread-${conversationId}`, { 
+            }, `uploadBufferToUnthread-${conversationId}`, { 
               /* ...unchanged... */
-        });
-
-        return result;
+            });
+            return result;
+        } finally {
+            // Ensure zeroization even on failures (idempotent)
+            if (fileBuffer?.buffer) fileBuffer.buffer.fill(0);
+        }

Also applies to: 1425-1427, 1352-1438

---

1496-1504: Batch Unthread upload: add timeout/abort and zeroize in finally

Mirror single-upload robustness: timeouts and guaranteed cleanup.

-            const uploadResponse = await fetch(`${API_BASE_URL}/conversations/${conversationId}/messages`, {
+            const controller = new AbortController();
+            const timeoutId = setTimeout(() => controller.abort(), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
+            const uploadResponse = await fetch(`${API_BASE_URL}/conversations/${conversationId}/messages`, {
                 method: 'POST',
                 headers: {
                     'X-API-KEY': UNTHREAD_API_KEY,
                     'X-Request-ID': `telegram-bot-batch-${conversationId}-${Date.now()}`,
                     ...formData.getHeaders()
                 },
-                body: formData
+                body: formData,
+                signal: controller.signal
             });
+            clearTimeout(timeoutId);
@@
-            // Security: Zero out buffers after upload
-            fileBuffers.forEach(fileBuffer => {
-                fileBuffer.buffer.fill(0);
-            });
+            // Security: Zero out buffers after upload
+            fileBuffers.forEach(fileBuffer => fileBuffer.buffer.fill(0));
@@
-        } catch (error) {
+        } catch (error) {
             LogEngine.error(`Error during batch upload to Unthread for conversation ${conversationId}:`, {
                 error: error instanceof Error ? error.message : String(error),
                 fileCount: fileBuffers.length,
                 totalSize: totalSize,
                 conversationId
             });
             throw error;
-        }
+        } finally {
+            // Ensure zeroization even on failures
+            fileBuffers.forEach(buf => buf.buffer.fill(0));
+        }

Also applies to: 1516-1520, 1454-1532

---

1285-1293: Secure iteration: Replace dynamic fileIds[index] access

Sir, I’ve detected the remaining dynamic indexing at src/utils/attachmentHandler.ts:1285, which still triggers ESLint’s security/detect-object-injection rule. To eliminate the risk, please refactor your loop to use for…of with entries():

Locations to update:

• src/utils/attachmentHandler.ts, around line 1285

Proposed change:

-        for (let index = 0; index < fileIds.length; index++) {
-            const fileId = fileIds[index];
+        for (const [index, fileId] of fileIds.entries()) {
             // Enhanced validation to prevent object injection
             if (!fileId || typeof fileId !== 'string' || fileId.trim().length === 0) {
                 LogEngine.warn('[AttachmentHandler] Skipping invalid file ID at index', { index });
                 conversionErrors.push(`File ${index + 1}: Invalid file ID`);
                 continue;
             }

src/utils/attachmentHandler.ts (6)

1145-1160: MIME allowlist logic is precise and resilient—nice work

Exact match plus wildcard handling avoids the “.includes” false-positive trap from earlier iterations.

---

480-483: Error classifier now catches Telegram variants—spot on

Extending checks to “upload”, “sendPhoto”, and “sendMediaGroup” improves accuracy of TELEGRAM_API_ERROR classification.

---

556-575: Eliminate per-iteration Buffer allocations in signature checks

Creating a Buffer for each signature on every iteration adds GC pressure. Compare bytes directly; it’s faster and avoids allocations.

-        for (const signature of signatures) {
-            if (buffer.length >= signature.length && Array.isArray(signature)) {
-                // Use Buffer.from once and compare directly for better performance
-                const signatureBuffer = Buffer.from(signature);
-                const match = buffer.subarray(0, signature.length).equals(signatureBuffer);
-                
-                if (match) {
+        for (const signature of signatures) {
+            if (buffer.length >= signature.length && Array.isArray(signature)) {
+                let match = true;
+                for (let i = 0; i < signature.length; i++) {
+                    if (buffer[i] !== signature[i]) { match = false; break; }
+                }
+                if (match) {
                     // Special case for WebP: need to check for WebP signature after RIFF
                     if (mimeType === 'image/webp' && buffer.length >= 12) {
                         const webpSignature = buffer.subarray(8, 12);
                         if (webpSignature.toString('ascii') === 'WEBP') {
                             return mimeType;
                         }
                         continue; // Not WebP, continue checking other formats
                     } else if (mimeType !== 'image/webp') {
                         return mimeType;
                     }
                 }
             }
         }

---

615-627: Prefer buffer signature when available; broaden mismatch detection

For non-clipboard flows, Content-Type can be spoofed. Trust buffer signature when it disagrees with Content-Type, and flag mismatches against both extension and buffer.

-    } else {
-        // Standard detection: prioritize Content-Type header for security
-        finalMimeType = contentTypeMime || extensionMime || 'application/octet-stream';
-        detectionMethod = contentTypeMime ? 'content-type' : 
-                         (extensionMime !== 'application/octet-stream' ? 'extension' : 'fallback');
-    }
+    } else {
+        // Standard detection: prefer Content-Type, but trust buffer signature if it disagrees
+        const ctBase = contentTypeMime ? contentTypeMime.split(';')[0].trim().toLowerCase() : null;
+        if (bufferMime !== 'application/octet-stream' && ctBase && ctBase !== bufferMime) {
+            finalMimeType = bufferMime;
+            detectionMethod = 'buffer-signature';
+            hasMismatch = true;
+        } else {
+            finalMimeType = contentTypeMime || extensionMime || 'application/octet-stream';
+            detectionMethod = contentTypeMime ? 'content-type' :
+                             (extensionMime !== 'application/octet-stream' ? 'extension' : 'fallback');
+        }
+    }
 
-    // Check for potential spoofing (but be lenient with clipboard files)
-    if (contentTypeMime && extensionMime !== 'application/octet-stream' && 
-        contentTypeMime !== extensionMime && !isClipboardLikely) {
-        hasMismatch = true;
-    }
+    // Check for potential spoofing (but be lenient with clipboard files)
+    if (!isClipboardLikely && contentTypeMime) {
+        const ct = contentTypeMime.split(';')[0].trim().toLowerCase();
+        if ((extensionMime !== 'application/octet-stream' && ct !== extensionMime) ||
+            (bufferMime !== 'application/octet-stream' && ct !== bufferMime)) {
+            hasMismatch = true;
+        }
+    }

Also applies to: 622-634

---

1785-1789: Telegram sendPhoto: re-validate size and use AbortController timeout

• Guard against Telegram’s 10MB hard limit with validateFileSize.
• Abort the request rather than only racing a timeout promise.

                     // Image-specific validation
                     if (!fileBuffer.mimeType.startsWith('image/')) {
                         throw new Error(`Only images are supported in this release. Got: ${fileBuffer.mimeType}`);
                     }
 
+                    // Telegram hard limit guard
+                    if (!this.validateFileSize(fileBuffer.size, fileBuffer.fileName)) {
+                        throw new Error(`File too large for Telegram: ${fileBuffer.size} bytes`);
+                    }
@@
-                    // Add upload timeout protection using Promise.race
-                    const uploadPromise = fetch(telegramApiUrl, {
+                    // Add upload timeout protection with AbortController
+                    const controller = new AbortController();
+                    const timeoutId = setTimeout(() => controller.abort(), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
+                    const uploadResponse = await fetch(telegramApiUrl, {
                         method: 'POST',
                         headers: {
                             'User-Agent': 'unthread-telegram-bot/2.0.0-image-flow',
                             ...formData.getHeaders()
                         },
-                        body: formData
+                        body: formData,
+                        signal: controller.signal
                     });
-                    
-                    const timeoutPromise = new Promise<never>((_, reject) => {
-                        setTimeout(() => reject(new Error(`Upload timeout after ${BUFFER_ATTACHMENT_CONFIG.uploadTimeout}ms`)), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
-                    });
-                    
-                    const uploadResponse = await Promise.race([uploadPromise, timeoutPromise]);
+                    clearTimeout(timeoutId);

Also applies to: 1814-1832

---

2012-2030: Telegram sendMediaGroup: abortable upload instead of Promise.race

Keep behavior consistent with sendPhoto and actually cancel the request on timeout.

-            // Send to Telegram
+            // Send to Telegram
             const telegramApiUrl = `https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMediaGroup`;
-            
-            // Add upload timeout protection using Promise.race
-            const uploadPromise = fetch(telegramApiUrl, {
+            const controller = new AbortController();
+            const timeoutId = setTimeout(() => controller.abort(), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
+            const response = await fetch(telegramApiUrl, {
                 method: 'POST',
                 headers: {
                     'User-Agent': 'unthread-telegram-bot/2.0.0-image-flow',
                     ...formData.getHeaders()
                 },
-                body: formData
+                body: formData,
+                signal: controller.signal
             });
-            
-            const timeoutPromise = new Promise<never>((_, reject) => {
-                setTimeout(() => reject(new Error(`Media group upload timeout after ${BUFFER_ATTACHMENT_CONFIG.uploadTimeout}ms`)), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
-            });
-            
-            const response = await Promise.race([uploadPromise, timeoutPromise]);
+            clearTimeout(timeoutId);

src/utils/attachmentHandler.ts (4)

909-921: Clear the timeout in a finally block; use built-in AbortController

Ensure timers are always cleared, even on errors, and avoid casting via globalThis.

-            // Create AbortController with timeout for robust request handling
-            const controller = new (globalThis as any).AbortController();
-            const timeoutId = setTimeout(() => controller.abort(), BUFFER_ATTACHMENT_CONFIG.downloadTimeout);
+            // Create AbortController with timeout for robust request handling
+            const controller = new AbortController();
+            const timeoutId = setTimeout(() => controller.abort(), BUFFER_ATTACHMENT_CONFIG.downloadTimeout);
@@
-            clearTimeout(timeoutId);
+        } finally {
+            // Always clear timer
+            if (typeof timeoutId !== 'undefined') clearTimeout(timeoutId as any);
         }

---

1140-1160: Minor perf nit: cache supported formats once per module

getImageProcessingConfig() may read env each time. Cache supportedFormats at module scope for hot paths.

Example:

// top-level
const SUPPORTED_FORMATS = getImageProcessingConfig().supportedFormats;

// usage
const isSupportedFormat = SUPPORTED_FORMATS.some(/* ... */);

---

345-382: BufferPool is currently unused—either integrate or remove

Dead code adds maintenance overhead. Consider using the pool for large buffers or removing it until needed.

---

915-915: Unify version strings/User-Agent identifiers

Multiple hard-coded versions (“1.0”, “4.0.0”, “5.0.0”, “2.0.0-image-flow”). Centralize as a single constant or derive from package.json to keep telemetry consistent.

Example:

const BOT_VERSION = process.env.BOT_VERSION ?? 'v1.0.0-rc2';

Also applies to: 1419-1423, 1819-1823, 2019-2021

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

TESTING.md (3)

28-31: Coverage math looks inconsistent; please correct or reword

“~715 lines out of ~24,752 total (~29%)” doesn’t compute (715/24,752 ≈ 2.9%). Either the numerator/denominator is off, or the percentage is. Suggest rewording to a plain percentage until coverage tooling is stable.

Proposed edit:

- - **Line Coverage**: ~715 lines out of ~24,752 total (~29%)
+ - **Line Coverage**: ~29% (estimated; pending stable coverage tooling)

---

55-62: Fix markdownlint MD040: add a language to the fenced block

Add a language hint (e.g., text) to satisfy markdownlint.

-```
+```text
 src/
 ├── __tests__/
 │   ├── messageContentExtractor.test.ts
 │   ├── simpleValidators.test.ts
 │   └── env.test.ts
 └── [source files...]
-```
+```

---

11-16: Stabilize coverage note; ensure watch script exists

• The minimatch caveat is useful, but consider pinning or linking to the known issue for future you.
• Verify package.json includes test:watch so “yarn test:watch” works as advertised.

If desired, I can raise a follow-up PR to:

• Pin compatible versions for coverage,
• Add a dedicated “coverage” script (e.g., “jest --coverage”),
• Update this doc accordingly.

src/__tests__/messageContentExtractor.test.ts (1)

157-180: Optional: add a document-with-caption case to exercise type=document

You already cover photo+caption; add a document+caption to verify getMessageTypeInfo() sets type to 'document' and textSource to 'caption'.

If you want, I can draft the test snippet.

src/__tests__/env.test.ts (1)

15-26: Harden env isolation across tests

Current pattern works, but copying the object up-front avoids accidental reference coupling; resetting modules guards against cached imports reading stale env.

-describe('env utilities', () => {
-  // Store original env vars to restore after tests
-  const originalEnv = process.env;
-
-  beforeEach(() => {
-    // Create a fresh copy of environment for each test
-    process.env = { ...originalEnv };
-  });
-
-  afterEach(() => {
-    // Restore original environment
-    process.env = originalEnv;
-  });
+describe('env utilities', () => {
+  // Snapshot original env to avoid reference coupling
+  const ORIGINAL_ENV = { ...process.env };
+
+  beforeEach(() => {
+    // Ensure fresh env and clear module cache if any module reads env at import time
+    jest.resetModules();
+    process.env = { ...ORIGINAL_ENV };
+  });
+
+  afterEach(() => {
+    process.env = ORIGINAL_ENV;
+  });

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

src/utils/attachmentHandler.ts (4)

589-609: Avoid per-iteration Buffer allocations in signature compare (hot path)

Allocating Buffer.from(signature) inside nested loops adds GC churn under load. Compare bytes directly.

-        for (const signature of signatures) {
-            if (buffer.length >= signature.length && Array.isArray(signature)) {
-                // Use Buffer.from once and compare directly for better performance
-                const signatureBuffer = Buffer.from(signature);
-                const match = buffer.subarray(0, signature.length).equals(signatureBuffer);
-                
-                if (match) {
+        for (const signature of signatures) {
+            if (buffer.length >= signature.length && Array.isArray(signature)) {
+                let match = true;
+                for (let i = 0; i < signature.length; i++) {
+                    if (buffer[i] !== signature[i]) { match = false; break; }
+                }
+                if (match) {
                     // Special case for WebP: need to check for WebP signature after RIFF
                     if (mimeType === 'image/webp' && buffer.length >= 12) {
                         const webpSignature = buffer.subarray(8, 12);
                         if (webpSignature.toString('ascii') === 'WEBP') {
                             return mimeType;
                         }
                         continue; // Not WebP, continue checking other formats
                     } else if (mimeType !== 'image/webp') {
                         return mimeType;
                     }
                 }
             }
         }

---

619-667: Prefer buffer signature over Content-Type; normalize header; surface all mismatches

Content-Type is trivially spoofable. When buffer detection is available and conflicts with Content-Type, prefer the buffer and flag the mismatch. Also normalize Content-Type (strip parameters) to avoid false mismatches.

-    if (isClipboardLikely && BUFFER_ATTACHMENT_CONFIG.enableClipboardSupport) {
+    if (isClipboardLikely && BUFFER_ATTACHMENT_CONFIG.enableClipboardSupport) {
         // For clipboard scenarios, prioritize buffer inspection if available
         if (bufferMime !== 'application/octet-stream') {
             finalMimeType = bufferMime;
             detectionMethod = 'buffer-signature';
         } else if (extensionMime !== 'application/octet-stream') {
             finalMimeType = extensionMime;
             detectionMethod = 'extension-fallback';
         } else {
             finalMimeType = contentTypeMime || 'application/octet-stream';
             detectionMethod = 'content-type-fallback';
         }
-    } else {
-        // Standard detection: prioritize Content-Type header for security
-        finalMimeType = contentTypeMime || extensionMime || 'application/octet-stream';
-        detectionMethod = contentTypeMime ? 'content-type' : 
-                         (extensionMime !== 'application/octet-stream' ? 'extension' : 'fallback');
+    } else {
+        // Standard detection: prefer buffer when it disagrees with Content-Type
+        const ctBase = contentTypeMime ? contentTypeMime.split(';')[0].trim().toLowerCase() : null;
+        if (bufferMime !== 'application/octet-stream' && ctBase && ctBase !== bufferMime) {
+            finalMimeType = bufferMime;
+            detectionMethod = 'buffer-signature';
+            hasMismatch = true;
+        } else {
+            finalMimeType = contentTypeMime || extensionMime || 'application/octet-stream';
+            detectionMethod = contentTypeMime ? 'content-type' :
+                             (extensionMime !== 'application/octet-stream' ? 'extension' : 'fallback');
+        }
     }
 
-    // Check for potential spoofing (but be lenient with clipboard files)
-    if (contentTypeMime && extensionMime !== 'application/octet-stream' && 
-        contentTypeMime !== extensionMime && !isClipboardLikely) {
-        hasMismatch = true;
-    }
+    // Check for potential spoofing (but be lenient with clipboard files)
+    if (!isClipboardLikely && contentTypeMime) {
+        const ctBase = contentTypeMime.split(';')[0].trim().toLowerCase();
+        if ((extensionMime !== 'application/octet-stream' && ctBase !== extensionMime) ||
+            (bufferMime !== 'application/octet-stream' && ctBase !== bufferMime)) {
+            hasMismatch = true;
+        }
+    }

---

545-571: HEIC/AVIF: handle ‘mif1’/‘msf1’ brands and avoid false negatives

Many HEIF images carry major brand ‘mif1’/‘msf1’ (generic HEIF). Current switch misses them, leading to misclassification as octet-stream.

Apply minimal improvement (acknowledging that a full compatible-brands parse would be best):

-    const brandIdentifier = buffer.subarray(8, 12).toString('ascii');
+    const brandIdentifier = buffer.subarray(8, 12).toString('ascii').toLowerCase();
     
     switch (brandIdentifier) {
-        case 'heic':
-        case 'heix':
-        case 'heim':
-        case 'heis':
+        case 'heic':
+        case 'heix':
+        case 'heim':
+        case 'heis':
+        case 'mif1': // generic HEIF brand
+        case 'msf1': // generic HEIF sequence brand
             return 'image/heic';
         case 'avif':
         case 'avis':
             return 'image/avif';
         default:
             return null;
     }

Note: For maximum accuracy, parsing the remaining ‘ftyp’ box to scan compatible brands for ‘heic’/’avif’ is recommended in a follow-up.

---

2049-2064: Use AbortController for media group timeout (actual abort), not Promise.race

Mirror the single-image approach: race doesn’t cancel the socket.

-            // Add upload timeout protection using Promise.race
-            const uploadPromise = fetch(telegramApiUrl, {
+            // Add upload timeout with AbortController (actual abort)
+            const controller = new AbortController();
+            const timeoutId = setTimeout(() => controller.abort(), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
+            const response = await fetch(telegramApiUrl, {
                 method: 'POST',
                 headers: {
                     'User-Agent': 'unthread-telegram-bot/2.0.0-image-flow',
                     ...formData.getHeaders()
                 },
-                body: formData
+                body: formData,
+                signal: controller.signal
             });
-            
-            const timeoutPromise = new Promise<never>((_, reject) => {
-                setTimeout(() => reject(new Error(`Media group upload timeout after ${BUFFER_ATTACHMENT_CONFIG.uploadTimeout}ms`)), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
-            });
-            
-            const response = await Promise.race([uploadPromise, timeoutPromise]);
+            clearTimeout(timeoutId);

src/utils/attachmentHandler.ts (3)

42-47: Documentation vs configuration drift (5 vs 10 files)

Header says “Maximum files per batch: 5” while config sets maxFiles to 10. Please align the doc or the config to avoid operator confusion.

Also applies to: 265-269

---

2033-2038: Media group: validate per-file sizes before constructing FormData

Fail-fast with a precise error rather than relying on Telegram to reject.

             // Attach all images
-            imageBuffers.forEach((buffer, index) => {
+            imageBuffers.forEach((buffer, index) => {
+                if (!this.validateFileSize(buffer.size, buffer.fileName)) {
+                    throw new Error(`Image too large for Telegram: ${buffer.fileName} (${buffer.size} bytes)`);
+                }
                 formData.append(`photo${index}`, buffer.buffer, {
                     filename: buffer.fileName,
                     contentType: buffer.mimeType
                 });
             });

---

948-949: Centralize User-Agent/version strings for consistency and traceability

Multiple UA/version strings are hard-coded and inconsistent (1.0, 2.0.0-image-flow, 5.0.0). Recommend a single constant derived from package version.

Example:

+const USER_AGENT = `unthread-telegram-bot/${process.env.npm_package_version || 'dev'}`;
...
-                    'User-Agent': 'unthread-telegram-bot/1.0'
+                    'User-Agent': USER_AGENT
...
-                'User-Agent': 'UnthreadBot/5.0.0 (Enhanced-Error-Handling)'
+                'User-Agent': `${USER_AGENT} (Enhanced-Error-Handling)`
...
-                            'User-Agent': 'unthread-telegram-bot/2.0.0-image-flow',
+                            'User-Agent': `${USER_AGENT}-image-flow`,
...
-                    'User-Agent': 'unthread-telegram-bot/2.0.0-image-flow',
+                    'User-Agent': `${USER_AGENT}-image-flow`,

Also applies to: 1096-1097, 1855-1856, 2053-2054

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

src/utils/attachmentHandler.ts (3)

588-607: Hot path allocation: remove Buffer.from(signature) inside detection loop

Avoid per-iteration Buffer allocations; compare bytes directly. Lower GC pressure and improve throughput.

-        for (const signature of signatures) {
-            if (buffer.length >= signature.length && Array.isArray(signature)) {
-                // Use Buffer.from once and compare directly for better performance
-                const signatureBuffer = Buffer.from(signature);
-                const match = buffer.subarray(0, signature.length).equals(signatureBuffer);
+        for (const signature of signatures) {
+            if (buffer.length >= signature.length && Array.isArray(signature)) {
+                let match = true;
+                for (let i = 0; i < signature.length; i++) {
+                    if (buffer[i] !== signature[i]) {
+                        match = false;
+                        break;
+                    }
+                }
                 
                 if (match) {
                     // Special case for WebP: need to check for WebP signature after RIFF
                     if (mimeType === 'image/webp' && buffer.length >= 12) {
                         const webpSignature = buffer.subarray(8, 12);
                         if (webpSignature.toString('ascii') === 'WEBP') {
                             return mimeType;
                         }
                         continue; // Not WebP, continue checking other formats
                     } else if (mimeType !== 'image/webp') {
                         return mimeType;
                     }
                 }
             }
         }

---

649-659: Prefer buffer signature on mismatch; broaden spoofing detection

For non-clipboard flows, trust the buffer signature when it disagrees with Content-Type. Also flag CT vs. buffer mismatches.

-    } else {
-        // Standard detection: prioritize Content-Type header for security
-        finalMimeType = contentTypeMime || extensionMime || 'application/octet-stream';
-        detectionMethod = contentTypeMime ? 'content-type' : 
-                         (extensionMime !== 'application/octet-stream' ? 'extension' : 'fallback');
-    }
+    } else {
+        // Standard detection: prefer Content-Type, but trust buffer signature when it disagrees
+        const ctBase = contentTypeMime ? contentTypeMime.split(';')[0].trim().toLowerCase() : null;
+        if (bufferMime !== 'application/octet-stream' && ctBase && ctBase !== bufferMime) {
+            finalMimeType = bufferMime;
+            detectionMethod = 'buffer-signature';
+            hasMismatch = true;
+        } else {
+            finalMimeType = contentTypeMime || extensionMime || 'application/octet-stream';
+            detectionMethod = contentTypeMime ? 'content-type' :
+                             (extensionMime !== 'application/octet-stream' ? 'extension' : 'fallback');
+        }
+    }
 
-    // Check for potential spoofing (but be lenient with clipboard files)
-    if (contentTypeMime && extensionMime !== 'application/octet-stream' && 
-        contentTypeMime !== extensionMime && !isClipboardLikely) {
-        hasMismatch = true;
-    }
+    // Check for potential spoofing (be lenient with clipboard files)
+    if (!isClipboardLikely && contentTypeMime) {
+        const ct = contentTypeMime.split(';')[0].trim().toLowerCase();
+        if ((extensionMime !== 'application/octet-stream' && ct !== extensionMime) ||
+            (bufferMime !== 'application/octet-stream' && ct !== bufferMime)) {
+            hasMismatch = true;
+        }
+    }

---

2085-2104: sendMediaGroup: replace Promise.race timeout with AbortController to actually abort network I/O

Ensures hung requests are canceled rather than merely timing out logically.

-            // Add upload timeout protection using Promise.race
-            const uploadPromise = fetch(telegramApiUrl, {
-                method: 'POST',
-                headers: {
-                    'User-Agent': 'unthread-telegram-bot/2.0.0-image-flow',
-                    ...formData.getHeaders()
-                },
-                body: formData
-            });
-            
-            const timeoutPromise = new Promise<never>((_, reject) => {
-                setTimeout(() => reject(new Error(`Media group upload timeout after ${BUFFER_ATTACHMENT_CONFIG.uploadTimeout}ms`)), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
-            });
-            
-            const response = await Promise.race([uploadPromise, timeoutPromise]);
+            // Apply real network timeout with AbortController
+            const controller = new (globalThis as any).AbortController();
+            const timeoutId = setTimeout(() => controller.abort(), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
+            const response = await fetch(telegramApiUrl, {
+                method: 'POST',
+                headers: {
+                    'User-Agent': 'unthread-telegram-bot/2.0.0-image-flow',
+                    ...formData.getHeaders()
+                },
+                body: formData,
+                signal: controller.signal
+            });
+            clearTimeout(timeoutId);

src/utils/attachmentHandler.ts (3)

42-46: Align documentation with configuration (batch size 5 vs 10)

Docs say “Maximum files per batch: 5” but config enforces 10 and mediaGroup logic accepts up to 10. Please reconcile.

- * - Maximum files per batch: 5 (prevents memory exhaustion)
+ * - Maximum files per batch: 10 (Telegram media group limit)

Also applies to: 266-269

---

339-376: Dead code smell: BufferPool declared but unused

The pool is created (globalBufferPool) but not leveraged in downloads/uploads. Either integrate it into allocation paths or remove to reduce complexity.

Would you like me to wire the pool into buffer creation hot spots (e.g., response arrayBuffer handling) or open a cleanup PR?

---

1252-1256: Version strings in logs are inconsistent

Observed "5.0.0", "4.0.0", "2.0.0-image-flow" while the release targets v1.0.0-rc2. Unify for supportability.

If you want, I can sweep the file and standardize log versions to 1.0.0-rc2.

Also applies to: 1390-1396, 1712-1741, 1895-1901

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

src/utils/attachmentHandler.ts (1)

2046-2060: Sir, I observe an inconsistency in your timeout implementations that warrants standardization.

The sendTelegramMediaGroup method uses Promise.race for timeout handling, while uploadBufferToTelegram employs the superior AbortController pattern. Promise.race doesn't actually cancel the underlying fetch request.

For consistency and proper resource management, standardize on AbortController:

-            // Add upload timeout protection using Promise.race
-            const uploadPromise = fetch(telegramApiUrl, {
+            // Use AbortController for proper timeout handling
+            const abortController = new AbortController();
+            const timeoutId = setTimeout(() => abortController.abort(), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
+            
+            const response = await fetch(telegramApiUrl, {
                 method: 'POST',
                 headers: {
                     'User-Agent': 'unthread-telegram-bot/2.0.0-image-flow',
                     ...formData.getHeaders()
                 },
-                body: formData
+                body: formData,
+                signal: abortController.signal
             });
-            
-            const timeoutPromise = new Promise<never>((_, reject) => {
-                setTimeout(() => reject(new Error(`Media group upload timeout after ${BUFFER_ATTACHMENT_CONFIG.uploadTimeout}ms`)), BUFFER_ATTACHMENT_CONFIG.uploadTimeout);
-            });
-            
-            const response = await Promise.race([uploadPromise, timeoutPromise]);
+            clearTimeout(timeoutId);

This ensures consistent timeout behavior and proper request cancellation across both upload methods.

src/utils/attachmentHandler.ts (2)

2-51: Sir, your comprehensive documentation is admirably thorough, though some performance claims require verification.

The extensive documentation outlines impressive capabilities, but I notice several specific metrics that should be validated against the actual implementation:

• "Maximum concurrent files: 3" - Line 278 shows maxConcurrentFiles: 3, but the code processes files sequentially (line 1277)
• "Maximum files per batch: 5" - Configuration shows maxFiles: 10 (line 268)
• "Processing timeout: 30 seconds" - Shows uploadTimeout: 30000 but downloadTimeout: 15000

Consider aligning the documentation with the actual configuration values to maintain accuracy.

---

544-574: Sir, your buffer-based MIME detection system demonstrates excellent security awareness, though a performance optimization opportunity presents itself.

The magic number detection logic is sound, but I observe an opportunity to eliminate redundant Buffer allocations within the signature matching loop. Currently, Buffer.from(signature) executes on each iteration.

Consider pre-converting signatures to Buffers during module initialization:

+// Pre-convert signatures to Buffers for performance
+const FILE_SIGNATURES_BUFFERS = Object.entries(FILE_SIGNATURES).reduce((acc, [mimeType, signatures]) => {
+    acc[mimeType] = signatures.map(sig => Buffer.from(sig));
+    return acc;
+}, {} as Record<string, Buffer[]>);

-function detectMimeTypeFromBuffer(buffer: Buffer): string {
+function detectMimeTypeFromBuffer(buffer: Buffer): string {
     if (buffer.length < 4) {
         return 'application/octet-stream';
     }

-    for (const [mimeType, signatures] of Object.entries(FILE_SIGNATURES)) {
+    for (const [mimeType, signatures] of Object.entries(FILE_SIGNATURES_BUFFERS)) {
         for (const signature of signatures) {
             if (buffer.length >= signature.length) {
-                const signatureBuffer = Buffer.from(signature);
-                const match = buffer.subarray(0, signature.length).equals(signatureBuffer);
+                const match = buffer.subarray(0, signature.length).equals(signature);

This eliminates per-iteration allocations while maintaining the robust detection logic.

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.

src/commands/processors/CallbackProcessors.ts (1)

642-642: Enhance null safety and eliminate any in CallbackProcessors.ts
Sir, to comply with our ESLint rules and ensure robust behavior, please apply the following changes:

• Guard against missing chat context (line 274)

// Before
const chatId = ctx.chat!.id;

// After
if (!ctx.chat?.id) {
  await ctx.editMessageText("❌ Cannot proceed: missing chat context.");
  return true;
}
const chatId = ctx.chat.id;

• Validate UNTHREAD_CUSTOMER_ID (lines 642, 650, 673, 682, 711)

// Before
customerId: process.env.UNTHREAD_CUSTOMER_ID!,

// After (once, e.g. at top of handler)
const defaultCustomerId = process.env.UNTHREAD_CUSTOMER_ID;
if (!defaultCustomerId) {
  LogEngine.error("UNTHREAD_CUSTOMER_ID is not configured");
  await ctx.editMessageText("❌ System misconfiguration. Please contact an administrator.");
  return true;
}
// …then use defaultCustomerId without ‘!’

• Replace any in createTicketDirectly (line 566) with a minimal shape

type TicketUserState = {
  email: string;
  summary: string;
  attachmentIds?: string[];
};

private async createTicketDirectly(
  ctx: BotContext,
  userState: TicketUserState
): Promise<boolean> { … }

These adjustments remove non-null assertions and strengthen typing.

src/commands/admin/AdminCommands.ts (1)

342-346: Avoid repeated storage lookups: generate the short ID once and reuse it

You’re generating the same short callback ID four times for the same session. Since the mapping is per-session, each await hits storage and returns the same value. Generate once and reuse to cut I/O and latency.

Apply this diff within the selected lines:

-            const shortSuggestedId = await SetupCallbackProcessor.generateShortCallbackId(sessionId);
-            const shortCustomId = await SetupCallbackProcessor.generateShortCallbackId(sessionId);
-            const shortExistingId = await SetupCallbackProcessor.generateShortCallbackId(sessionId);
-            const shortCancelId = await SetupCallbackProcessor.generateShortCallbackId(sessionId);
+            const shortId = await SetupCallbackProcessor.generateShortCallbackId(sessionId);

And update the button usages below to use shortId:

// outside the selected range; for reference only
{ text: `✅ Use "${suggestedName}"`, callback_data: `setup_use_suggested_${shortId}` }
{ text: "✏️ Use Different Name", callback_data: `setup_custom_name_${shortId}` }
{ text: "🔗 Existing Customer ID", callback_data: `setup_existing_customer_${shortId}` }
{ text: "❌ Cancel Setup", callback_data: `setup_cancel_${shortId}` }

src/commands/processors/ConversationProcessors.ts (3)

1035-1037: Consolidate duplicate short ID generation

Both shortBackId and shortCancelId resolve to the same session short ID. Generate once and reuse to reduce storage calls.

-                const shortBackId = await SetupCallbackProcessor.generateShortCallbackId(session.sessionId);
-                const shortCancelId = await SetupCallbackProcessor.generateShortCallbackId(session.sessionId);
+                const shortId = await SetupCallbackProcessor.generateShortCallbackId(session.sessionId);

Update button usages accordingly:

// outside the selected range; for reference only
{ text: "⬅️ Back to Options", callback_data: `setup_back_to_customer_selection_${shortId}` }
{ text: "❌ Cancel Setup", callback_data: `setup_cancel_${shortId}` }

---

1087-1091: Same optimization here: one short ID is sufficient

Four awaits for the same session in the error path are unnecessary. Generate once and reuse across the buttons.

-            const shortCustomId = await SetupCallbackProcessor.generateShortCallbackId(session.sessionId);
-            const shortExistingId = await SetupCallbackProcessor.generateShortCallbackId(session.sessionId);
-            const shortBackId = await SetupCallbackProcessor.generateShortCallbackId(session.sessionId);
-            const shortCancelId = await SetupCallbackProcessor.generateShortCallbackId(session.sessionId);
+            const shortId = await SetupCallbackProcessor.generateShortCallbackId(session.sessionId);

Then use shortId in all callback_data.

---

1281-1281: Return type includes validationMsg but it’s not consumed by callers

validateCustomerId now returns validationMsg?: { message_id: number }, but the caller doesn’t use it. Consider removing it from the return type or wire it into a cleanup/edit step to avoid confusion.

Would you like me to sweep the repo for usages and propose a small refactor to either remove or utilize validationMsg?

src/commands/processors/CallbackProcessors.ts (2)

1379-1381: Consolidate repeated short ID generation in setup buttons

You’re generating multiple short IDs for the same session in a single view (back/cancel/suggested/custom/existing). The mapping is per-session, so one ID suffices. This trims storage access and keeps things tidy.

Example for one block:

-        const shortBackId = await SetupCallbackProcessor.generateShortCallbackId(sessionId);
-        const shortCancelId = await SetupCallbackProcessor.generateShortCallbackId(sessionId);
+        const shortId = await SetupCallbackProcessor.generateShortCallbackId(sessionId);

Then use shortId in the callback_data for all buttons in that view.

Also applies to: 1430-1432, 2525-2529

---

46-48: Remove unused callbackIdCounter fields

These remnants from the in-memory approach are no longer used.

-    // Static counter for generating unique callback IDs (no in-memory storage)
-    private static callbackIdCounter = 1;
+    // (removed) counter not needed with persistent IDs

Also applies to: 890-892

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

Learnt from: warengonzaga
PR: wgtechlabs/unthread-telegram-bot#24
File: docker-compose.yaml:29-29
Timestamp: 2025-06-22T10:12:09.684Z
Learning: The Unthread Telegram Bot project is currently in beta development phase (v1.0.0-beta.2) and does not yet have official versioned Docker builds available, making the use of :latest tags acceptable for development purposes in docker-compose.yaml.