Update app.py

app.py

@@ -125,8 +125,9 @@ class FontManager:
             ], check=True)
             subprocess.run([
                 "apt-get", "install", "-y",
-                "fonts-liberation", # Provides Liberation fonts (Arial alternative)
-                "fontconfig"        # Font configuration
+                "fonts-liberation",    # Liberation Sans fonts
+                "fontconfig",          # Font configuration
+                "fonts-dejavu-core"    # DejaVu fonts as fallback
             ], check=True)
             
             # Clear font cache
@@ -139,34 +140,63 @@ class FontManager:
     
     @staticmethod
     def get_font_paths() -> Dict[str, str]:
-        """Get the paths to the required fonts"""
-        # Liberation Sans is a metric-compatible replacement for Arial
+        """Get the paths to the required fonts with multiple fallbacks"""
+        standard_paths = [
+            "/usr/share/fonts",
+            "/usr/local/share/fonts",
+            "/usr/share/fonts/truetype",
+            "~/.fonts"
+        ]
+        
         font_paths = {
-            'regular': '/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf',
-            'bold': '/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf'
+            'regular': None,
+            'bold': None
         }
         
-        # Fallback paths for different distributions
-        fallback_paths = {
+        # Common font filenames to try
+        fonts_to_try = {
             'regular': [
-                '/usr/share/fonts/liberation-sans/LiberationSans-Regular.ttf',
-                '/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf',
-                '/usr/share/fonts/TTF/LiberationSans-Regular.ttf'
+                'LiberationSans-Regular.ttf',
+                'DejaVuSans.ttf',
+                'FreeSans.ttf'
             ],
             'bold': [
-                '/usr/share/fonts/liberation-sans/LiberationSans-Bold.ttf',
-                '/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf',
-                '/usr/share/fonts/TTF/LiberationSans-Bold.ttf'
+                'LiberationSans-Bold.ttf',
+                'DejaVuSans-Bold.ttf',
+                'FreeSans-Bold.ttf'
             ]
         }
         
-        # Check fallback paths
+        def find_font(font_name: str) -> Optional[str]:
+            """Search for a font file in standard locations"""
+            for base_path in standard_paths:
+                for root, _, files in os.walk(os.path.expanduser(base_path)):
+                    if font_name in files:
+                        return os.path.join(root, font_name)
+            return None
+        
+        # Try to find each font
         for style in ['regular', 'bold']:
-            if not os.path.exists(font_paths[style]):
-                for path in fallback_paths[style]:
-                    if os.path.exists(path):
-                        font_paths[style] = path
-                        break
+            for font_name in fonts_to_try[style]:
+                font_path = find_font(font_name)
+                if font_path:
+                    font_paths[style] = font_path
+                    break
+        
+        # If no fonts found, try using fc-match as fallback
+        if not all(font_paths.values()):
+            try:
+                for style in ['regular', 'bold']:
+                    if not font_paths[style]:
+                        result = subprocess.run(
+                            ['fc-match', '-f', '%{file}', 'sans-serif:style=' + style],
+                            capture_output=True,
+                            text=True
+                        )
+                        if result.returncode == 0 and result.stdout.strip():
+                            font_paths[style] = result.stdout.strip()
+            except Exception as e:
+                print(f"Warning: Could not use fc-match to find fonts: {e}")
         
         return font_paths
 
@@ -189,10 +219,12 @@ class CertificateGenerator:
         """Load fonts with fallbacks"""
         fonts = {}
         try:
-            # Use Liberation Sans fonts instead of Arial
-            fonts['title'] = ImageFont.truetype(self.font_paths['bold'], 60)
-            fonts['text'] = ImageFont.truetype(self.font_paths['regular'], 40)
-            fonts['subtitle'] = ImageFont.truetype(self.font_paths['regular'], 30)
+            if self.font_paths['regular'] and self.font_paths['bold']:
+                fonts['title'] = ImageFont.truetype(self.font_paths['bold'], 60)
+                fonts['text'] = ImageFont.truetype(self.font_paths['regular'], 40)
+                fonts['subtitle'] = ImageFont.truetype(self.font_paths['regular'], 30)
+            else:
+                raise ValueError("No suitable fonts found")
         except Exception as e:
             print(f"Font loading error: {e}. Using default font.")
             default = ImageFont.load_default()