fix images validation in _parse_image method

src/api/models/bedrock.py

@@ -738,35 +738,53 @@ def _create_response_stream(
 
         return None
 
-    def _parse_image(self, image_url: str) -> tuple[bytes, str]:
-        """Try to get the raw data from an image url.
+    def _get_supported_image_types(self) -> list[str]:
+        return ["png", "jpeg", "gif", "webp"]
 
-        Ref: https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_ImageSource.html
-        returns a tuple of (Image Data, Content Type)
-        """
-        pattern = r"^data:(image/[a-z]*);base64,\s*"
-        content_type = re.search(pattern, image_url)
-        # if already base64 encoded.
-        # Only supports 'image/jpeg', 'image/png', 'image/gif' or 'image/webp'
-        if content_type:
-            image_data = re.sub(pattern, "", image_url)
-            return base64.b64decode(image_data), content_type.group(1)
-
-        # Send a request to the image URL
-        response = requests.get(image_url)
-        # Check if the request was successful
-        if response.status_code == 200:
+    def _parse_image(self, image_url: str) -> tuple[bytes, str]:
+
+        if "base64" in image_url:
+
+            # base 64 is passed as data:image/jpeg;base64,<base-64-encoded-image>
+            image_metadata, image_data = image_url.split(",")
+
+            content_type_match = re.match(r"data:(.*?);base64", image_metadata)
+            content_type = content_type_match.group(1)
+            image_format = content_type.split("/")[1]
+            supported_image_formats = self._get_supported_image_types()
+
+            if image_format in supported_image_formats:
+                return base64.b64decode(image_data), content_type
+            else:
+                # Handle the case when the image format is not supported
+                raise ValueError(
+                    "Unsupported image format: {}. Supported formats: {}".format(
+                        content_type, supported_image_formats
+                    )
+                )
 
+        elif image_url.startswith(('http://', 'https://')):
+            # Send a request to the image URL
+            response = requests.get(image_url)
+            # if fetch image
+            response.raise_for_status()
+
             content_type = response.headers.get("Content-Type")
-            if not content_type.startswith("image"):
-                content_type = "image/jpeg"
+            if not content_type or "image" not in content_type:
+                #content_type = "image/jpeg"
+                raise ValueError(
+                       f"URL does not point to a valid image content_type, such as: (content-type: 'image/jpeg')"
+                )
+
             # Get the image content
             image_content = response.content
             return image_content, content_type
         else:
-            raise HTTPException(
-                status_code=500, detail="Unable to access the image url"
-            )
+            raise ValueError(
+               "Unsupported image type. Expected either image url or base64 encoded string - \
+                  e.g. 'data:image/jpeg;base64,<base64-encoded-string>'"
+            )            
+
 
     def _parse_content_parts(
             self,