feat: resolve blake3 hashes in /view endpoint via asset database

Amp-Thread-ID: https://ampcode.com/threads/T-019cda7d-cb21-77b4-a51b-b965af60208c
Co-authored-by: Amp <amp@ampcode.com>

server.py

@@ -479,6 +479,13 @@ class PromptServer():
         async def view_image(request):
             if "filename" in request.rel_url.query:
                 filename = request.rel_url.query["filename"]
+
+                # If the filename is a blake3 hash, resolve it via the asset database
+                if filename.startswith("blake3:"):
+                    file, filename = self._resolve_blake3_to_path(filename)
+                    if file is None:
+                        return web.Response(status=404)
+                else:
                     filename, output_dir = folder_paths.annotated_filepath(filename)
 
                     if not filename:
@@ -995,6 +1002,31 @@ class PromptServer():
         timeout = aiohttp.ClientTimeout(total=None) # no timeout
         self.client_session = aiohttp.ClientSession(timeout=timeout)
 
+    def _resolve_blake3_to_path(self, asset_hash: str) -> tuple[str | None, str]:
+        """Resolve a blake3 hash to an absolute file path via the asset database.
+
+        Returns (abs_path, display_filename) or (None, "") if not found.
+        """
+        from app.database.db import create_session
+        from app.assets.database.queries import get_asset_by_hash, list_references_by_asset_id
+        from app.assets.helpers import select_best_live_path
+
+        with create_session() as session:
+            asset = get_asset_by_hash(session, asset_hash)
+            if not asset:
+                return None, ""
+            refs = list_references_by_asset_id(session, asset_id=asset.id)
+            abs_path = select_best_live_path(refs)
+            if not abs_path:
+                return None, ""
+            display_name = os.path.basename(abs_path)
+            # Prefer the reference name if available
+            for ref in refs:
+                if ref.file_path == abs_path and ref.name:
+                    display_name = ref.name
+                    break
+            return abs_path, display_name
+
     def add_routes(self):
         self.user_manager.add_routes(self.routes)
         self.model_file_manager.add_routes(self.routes)