feat(api): Enhance multi modal support.

api/controllers/web/file.py

@@ -1,3 +1,5 @@
+import urllib.parse
+
 from flask import request
 from flask_restful import marshal_with
 
@@ -5,7 +7,8 @@ import services
 from controllers.web import api
 from controllers.web.error import FileTooLargeError, NoFileUploadedError, TooManyFilesError, UnsupportedFileTypeError
 from controllers.web.wraps import WebApiResource
-from fields.file_fields import file_fields
+from core.helper import ssrf_proxy
+from fields.file_fields import file_fields, remote_file_info_fields
 from services.file_service import FileService
 
 
@@ -31,4 +34,19 @@ class FileApi(WebApiResource):
         return upload_file, 201
 
 
+class RemoteFileInfoApi(WebApiResource):
+    @marshal_with(remote_file_info_fields)
+    def get(self, url):
+        decoded_url = urllib.parse.unquote(url)
+        try:
+            response = ssrf_proxy.head(decoded_url)
+            return {
+                "file_type": response.headers.get("Content-Type", "application/octet-stream"),
+                "file_length": int(response.headers.get("Content-Length", 0)),
+            }
+        except Exception as e:
+            return {"error": str(e)}, 400
+
+
 api.add_resource(FileApi, "/files/upload")
+api.add_resource(RemoteFileInfoApi, "/remote-files/<path:url>")