Add optional blake3 hashing during asset scanning

- Make blake3 import lazy in hashing.py (only imported when needed)
- Add compute_hashes parameter to AssetSeeder.start(), build_asset_specs(), and seed_assets()
- Fix missing tag clearing: include is_missing states in sync when update_missing_tags=True
- Clear is_missing flag on cache states when files are restored with matching mtime/size
- Fix validation error serialization in routes.py (use json.loads(ve.json()))

Amp-Thread-ID: https://ampcode.com/threads/T-019c3614-56d4-74a8-a717-19922d6dbbee
Co-authored-by: Amp <amp@ampcode.com>

app/assets/api/routes.py

@@ -79,7 +79,9 @@ def _build_error_response(
 
 
 def _build_validation_error_response(code: str, ve: ValidationError) -> web.Response:
-    return _build_error_response(400, code, "Validation failed.", {"errors": ve.json()})
+    import json
+    errors = json.loads(ve.json())
+    return _build_error_response(400, code, "Validation failed.", {"errors": errors})
 
 
 def _validate_sort_field(requested: str | None) -> str:
@@ -123,11 +125,8 @@ async def list_assets_route(request: web.Request) -> web.Response:
         return _build_validation_error_response("INVALID_QUERY", ve)
 
     sort = _validate_sort_field(q.sort)
-    order = (
-        "desc"
-        if (q.order or "desc").lower() not in {"asc", "desc"}
-        else q.order.lower()
-    )
+    order_candidate = (q.order or "desc").lower()
+    order = order_candidate if order_candidate in {"asc", "desc"} else "desc"
 
     result = list_assets_page(
         owner_id=USER_MANAGER.get_request_user_id(request),
@@ -233,7 +232,7 @@ async def download_asset_content(request: web.Request) -> web.Response:
         )
 
     quoted = (filename or "").replace("\r", "").replace("\n", "").replace('"', "'")
-    cd = f"{disposition}; filename=\"{quoted}\"; filename*=UTF-8''{urllib.parse.quote(filename)}"
+    cd = f"{disposition}; filename=\"{quoted}\"; filename*=UTF-8''{urllib.parse.quote(quoted)}"
 
     file_size = os.path.getsize(abs_path)
     logging.info(
@@ -490,15 +489,9 @@ async def get_tags(request: web.Request) -> web.Response:
     try:
         query = schemas_in.TagsListQuery.model_validate(query_map)
     except ValidationError as e:
-        return web.json_response(
-            {
-                "error": {
-                    "code": "INVALID_QUERY",
-                    "message": "Invalid query parameters",
-                    "details": e.errors(),
-                }
-            },
-            status=400,
+        import json
+        return _build_error_response(
+            400, "INVALID_QUERY", "Invalid query parameters", {"errors": json.loads(e.json())}
         )
 
     rows, total = list_tags(

app/assets/api/schemas_in.py

@@ -28,6 +28,7 @@ class AssetValidationError(Exception):
     def __init__(self, code: str, message: str):
         super().__init__(message)
         self.code = code
+        self.message = message
 
 
 class AssetNotFoundError(Exception):
@@ -35,12 +36,15 @@ class AssetNotFoundError(Exception):
 
     def __init__(self, message: str):
         super().__init__(message)
+        self.message = message
 
 
 class HashMismatchError(Exception):
     """Uploaded file hash does not match provided hash."""
 
-    pass
+    def __init__(self, message: str):
+        super().__init__(message)
+        self.message = message
 
 
 class DependencyMissingError(Exception):

app/assets/api/upload.py

@@ -1,3 +1,4 @@
+import logging
 import os
 import uuid
 from typing import Callable
@@ -83,7 +84,10 @@ async def parse_multipart_upload(
                 provided_hash = normalize_and_validate_hash(s)
                 try:
                     provided_hash_exists = check_hash_exists(provided_hash)
-                except Exception:
+                except Exception as e:
+                    logging.warning(
+                        "check_hash_exists failed for hash=%s: %s", provided_hash, e
+                    )
                     provided_hash_exists = None  # do not fail the whole request here
 
         elif fname == "file":
@@ -162,5 +166,5 @@ def delete_temp_file_if_exists(tmp_path: str | None) -> None:
         try:
             if os.path.exists(tmp_path):
                 os.remove(tmp_path)
-        except Exception:
-            pass
+        except OSError as e:
+            logging.debug("Failed to delete temp file %s: %s", tmp_path, e)