feat: thumbnails added

webui/backend/app/services/file_ops_service.py

@@ -25,6 +25,12 @@ SPECIAL_TEXT_FILENAMES = {
     "dockerfile": "text/plain",
     "containerfile": "text/plain",
 }
+THUMBNAIL_CONTENT_TYPES = {
+    ".jpg": "image/jpeg",
+    ".jpeg": "image/jpeg",
+    ".png": "image/png",
+    ".webp": "image/webp",
+}
 VIDEO_CONTENT_TYPES = {
     ".mp4": "video/mp4",
     ".mkv": "video/x-matroska",
@@ -370,6 +376,39 @@ class FileOpsService:
             "content": self._filesystem.stream_file_range(resolved_target.absolute, start, end),
         }
 
+    def prepare_thumbnail_stream(self, path: str) -> dict:
+        resolved_target = self._path_guard.resolve_existing_path(path)
+
+        if resolved_target.absolute.is_dir():
+            raise AppError(
+                code="type_conflict",
+                message="Source must be a file",
+                status_code=409,
+                details={"path": resolved_target.relative},
+            )
+        if not resolved_target.absolute.is_file():
+            raise AppError(
+                code="type_conflict",
+                message="Unsupported path type for thumbnail",
+                status_code=409,
+                details={"path": resolved_target.relative},
+            )
+
+        content_type = self._thumbnail_content_type_for(resolved_target.absolute)
+        if content_type is None:
+            raise AppError(
+                code="unsupported_type",
+                message="File type is not supported for thumbnail",
+                status_code=409,
+                details={"path": resolved_target.relative},
+            )
+
+        return {
+            "headers": {"Content-Length": str(int(resolved_target.absolute.stat().st_size))},
+            "content_type": content_type,
+            "content": self._filesystem.stream_file(resolved_target.absolute),
+        }
+
     @staticmethod
     def _join_relative(base: str, name: str) -> str:
         return f"{base}/{name}" if base else name
@@ -385,6 +424,10 @@ class FileOpsService:
     def _video_content_type_for(path: Path) -> str | None:
         return VIDEO_CONTENT_TYPES.get(path.suffix.lower())
 
+    @staticmethod
+    def _thumbnail_content_type_for(path: Path) -> str | None:
+        return THUMBNAIL_CONTENT_TYPES.get(path.suffix.lower())
+
     def _record_history(
         self,
         *,