fix: claude3 image type verification failed (#1038) (#1040)

packages/service/common/file/utils.ts

@@ -9,3 +9,21 @@ export const removeFilesByPaths = (paths: string[]) => {
     });
   });
 };
+
+const imageTypeMap: Record<string, string> = {
+  '/': 'image/jpeg',
+  i: 'image/png',
+  R: 'image/gif',
+  U: 'image/webp',
+  Q: 'image/bmp'
+};
+
+export const guessImageTypeFromBase64 = (str: string) => {
+  const defaultType = 'image/jpeg';
+  if (typeof str !== 'string' || str.length === 0) {
+    return defaultType;
+  }
+
+  const firstChar = str.charAt(0);
+  return imageTypeMap[firstChar] || defaultType;
+};