enh: configurable mistral ocr base url

backend/open_webui/retrieval/loaders/main.py

@@ -384,7 +384,9 @@ class Loader:
             in ["pdf"]  # Mistral OCR currently only supports PDF and images
         ):
             loader = MistralLoader(
-                api_key=self.kwargs.get("MISTRAL_OCR_API_KEY"), file_path=file_path
+                base_url=self.kwargs.get("MISTRAL_OCR_API_BASE_URL"),
+                api_key=self.kwargs.get("MISTRAL_OCR_API_KEY"),
+                file_path=file_path,
             )
         else:
             if file_ext == "pdf":

backend/open_webui/retrieval/loaders/mistral.py

@@ -30,10 +30,9 @@ class MistralLoader:
     - Enhanced error handling with retryable error classification
     """
 
-    BASE_API_URL = "https://api.mistral.ai/v1"
-
     def __init__(
         self,
+        base_url: str,
         api_key: str,
         file_path: str,
         timeout: int = 300,  # 5 minutes default
@@ -55,6 +54,9 @@ class MistralLoader:
         if not os.path.exists(file_path):
             raise FileNotFoundError(f"File not found at {file_path}")
 
+        self.base_url = (
+            base_url.rstrip("/") if base_url else "https://api.mistral.ai/v1"
+        )
         self.api_key = api_key
         self.file_path = file_path
         self.timeout = timeout
@@ -240,7 +242,7 @@ class MistralLoader:
         in a context manager to minimize memory usage duration.
         """
         log.info("Uploading file to Mistral API")
-        url = f"{self.BASE_API_URL}/files"
+        url = f"{self.base_url}/files"
 
         def upload_request():
             # MEMORY OPTIMIZATION: Use context manager to minimize file handle lifetime
@@ -275,7 +277,7 @@ class MistralLoader:
 
     async def _upload_file_async(self, session: aiohttp.ClientSession) -> str:
         """Async file upload with streaming for better memory efficiency."""
-        url = f"{self.BASE_API_URL}/files"
+        url = f"{self.base_url}/files"
 
         async def upload_request():
             # Create multipart writer for streaming upload
@@ -321,7 +323,7 @@ class MistralLoader:
     def _get_signed_url(self, file_id: str) -> str:
         """Retrieves a temporary signed URL for the uploaded file (sync version)."""
         log.info(f"Getting signed URL for file ID: {file_id}")
-        url = f"{self.BASE_API_URL}/files/{file_id}/url"
+        url = f"{self.base_url}/files/{file_id}/url"
         params = {"expiry": 1}
         signed_url_headers = {**self.headers, "Accept": "application/json"}
 
@@ -346,7 +348,7 @@ class MistralLoader:
         self, session: aiohttp.ClientSession, file_id: str
     ) -> str:
         """Async signed URL retrieval."""
-        url = f"{self.BASE_API_URL}/files/{file_id}/url"
+        url = f"{self.base_url}/files/{file_id}/url"
         params = {"expiry": 1}
 
         headers = {**self.headers, "Accept": "application/json"}
@@ -373,7 +375,7 @@ class MistralLoader:
     def _process_ocr(self, signed_url: str) -> Dict[str, Any]:
         """Sends the signed URL to the OCR endpoint for processing (sync version)."""
         log.info("Processing OCR via Mistral API")
-        url = f"{self.BASE_API_URL}/ocr"
+        url = f"{self.base_url}/ocr"
         ocr_headers = {
             **self.headers,
             "Content-Type": "application/json",
@@ -407,7 +409,7 @@ class MistralLoader:
         self, session: aiohttp.ClientSession, signed_url: str
     ) -> Dict[str, Any]:
         """Async OCR processing with timing metrics."""
-        url = f"{self.BASE_API_URL}/ocr"
+        url = f"{self.base_url}/ocr"
 
         headers = {
             **self.headers,
@@ -446,7 +448,7 @@ class MistralLoader:
     def _delete_file(self, file_id: str) -> None:
         """Deletes the file from Mistral storage (sync version)."""
         log.info(f"Deleting uploaded file ID: {file_id}")
-        url = f"{self.BASE_API_URL}/files/{file_id}"
+        url = f"{self.base_url}/files/{file_id}"
 
         try:
             response = requests.delete(
@@ -467,7 +469,7 @@ class MistralLoader:
             async def delete_request():
                 self._debug_log(f"Deleting file ID: {file_id}")
                 async with session.delete(
-                    url=f"{self.BASE_API_URL}/files/{file_id}",
+                    url=f"{self.base_url}/files/{file_id}",
                     headers=self.headers,
                     timeout=aiohttp.ClientTimeout(
                         total=self.cleanup_timeout