fix: properly decode base64 image data and detect MIME type

Image endpoint was returning base64 text instead of decoded binary.
Now properly decodes base64 from Odoo Binary field and detects actual
content type from magic bytes (JPEG, PNG, GIF, WebP).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

fusion-woo-odoo/fusion_woocommerce/controllers/api.py

@@ -23,16 +23,45 @@ class WooApiController(http.Controller):
         try:
             line = request.env['woo.variant.push.line'].sudo().browse(line_id)
             if not line.exists() or not line.image:
+                _logger.warning("Image endpoint: line %d not found or no image", line_id)
                 return request.not_found()
             img_data = line.image
-            if isinstance(img_data, str):
+            # Odoo Binary fields always return base64 string
+            if isinstance(img_data, (str, bytes)):
+                if isinstance(img_data, bytes):
+                    img_data = img_data.decode('utf-8')
                 img_data = base64.b64decode(img_data)
             elif isinstance(img_data, memoryview):
-                img_data = bytes(img_data)
+                # Raw bytea from DB — still base64 encoded by ORM
+                raw = bytes(img_data)
+                try:
+                    img_data = base64.b64decode(raw)
+                except Exception:
+                    img_data = raw
+            # Detect content type from magic bytes
             content_type = 'image/png'
-            if filename.lower().endswith('.jpg') or filename.lower().endswith('.jpeg'):
+            if img_data[:2] == b'\xff\xd8':
                 content_type = 'image/jpeg'
-            return Response(img_data, content_type=content_type, status=200)
+            elif img_data[:4] == b'\x89PNG':
+                content_type = 'image/png'
+            elif img_data[:4] == b'GIF8':
+                content_type = 'image/gif'
+            elif img_data[:4] == b'RIFF':
+                content_type = 'image/webp'
+            _logger.info("Serving image for line %d: %d bytes, %s", line_id, len(img_data), content_type)
+            # Set extension-appropriate filename
+            ext = content_type.split('/')[-1]
+            if ext == 'jpeg':
+                ext = 'jpg'
+            return Response(
+                img_data,
+                content_type=content_type,
+                status=200,
+                headers={
+                    'Content-Disposition': f'inline; filename="{filename.rsplit(".", 1)[0]}.{ext}"',
+                    'Cache-Control': 'no-cache',
+                },
+            )
         except Exception as e:
             _logger.error("Failed to serve variant image %d: %s", line_id, e)
             return request.not_found()