Deploy: 2026-05-23 18:39:58

backend/includes/WhatsApp.php

@@ -114,14 +114,32 @@ class WhatsAppClient {
             return;
         }
 
+        // Use jsDelivr CDN to bypass GitHub User-Agent blocks and rate limiting
         $fonts = [
-            'Roboto-Bold.ttf' => 'https://github.com/google/fonts/raw/main/apache/roboto/static/Roboto-Bold.ttf',
-            'Lora-Bold.ttf' => 'https://github.com/google/fonts/raw/main/ofl/lora/Lora-Bold.ttf'
+            'Roboto-Bold.ttf' => 'https://cdn.jsdelivr.net/gh/google/fonts@main/apache/roboto/static/Roboto-Bold.ttf',
+            'Lora-Bold.ttf' => 'https://cdn.jsdelivr.net/gh/google/fonts@main/ofl/lora/Lora-Bold.ttf'
         ];
 
         foreach ($fonts as $filename => $url) {
             $path = $fontDir . '/' . $filename;
-            if (!file_exists($path) || @filesize($path) < 20000) {
+            
+            // Validate if file exists and starts with valid TTF signatures
+            $isValid = false;
+            if (file_exists($path) && filesize($path) > 20000) {
+                $fp = @fopen($path, 'rb');
+                if ($fp) {
+                    $sig = fread($fp, 4);
+                    fclose($fp);
+                    // Match TTF signatures: 0x00010000, 'OTTO', 'true'
+                    if ($sig === "\x00\x01\x00\x00" || $sig === "OTTO" || $sig === "true") {
+                        $isValid = true;
+                    }
+                }
+            }
+
+            if (!$isValid) {
+                @unlink($path); // Delete invalid/corrupted file
+                
                 // Try file_get_contents first
                 $content = @file_get_contents($url);
                 if ($content !== false && strlen($content) > 20000) {