feat(download): add file_params support for precise file selection

py/services/download_coordinator.py

@@ -86,6 +86,7 @@ class DownloadCoordinator:
             progress_callback=progress_callback,
             download_id=download_id,
             source=payload.get("source"),
+            file_params=payload.get("file_params"),
         )
 
         result["download_id"] = download_id

py/services/download_manager.py

@@ -70,6 +70,7 @@ class DownloadManager:
         use_default_paths: bool = False,
         download_id: str = None,
         source: str = None,
+        file_params: Dict = None,
     ) -> Dict:
         """Download model from Civitai with task tracking and concurrency control
 
@@ -82,6 +83,7 @@ class DownloadManager:
             use_default_paths: Flag to use default paths
             download_id: Unique identifier for this download task
             source: Optional source parameter to specify metadata provider
+            file_params: Optional dict with file selection params (type, format, size, fp, isPrimary)
 
         Returns:
             Dict with download result
@@ -122,6 +124,7 @@ class DownloadManager:
                 progress_callback,
                 use_default_paths,
                 source,
+                file_params,
             )
         )
 
@@ -155,6 +158,7 @@ class DownloadManager:
         progress_callback=None,
         use_default_paths: bool = False,
         source: str = None,
+        file_params: Dict = None,
     ):
         """Execute download with semaphore to limit concurrency"""
         # Update status to waiting
@@ -215,6 +219,7 @@ class DownloadManager:
                         use_default_paths,
                         task_id,
                         source,
+                        file_params,
                     )
 
                     # Update status based on result
@@ -266,6 +271,7 @@ class DownloadManager:
         use_default_paths,
         download_id=None,
         source=None,
+        file_params=None,
     ):
         """Wrapper for original download_from_civitai implementation"""
         try:
@@ -456,16 +462,57 @@ class DownloadManager:
                 await progress_callback(0)
 
             # 2. Get file information
+            files = version_info.get("files", [])
+            file_info = None
+            
+            # If file_params is provided, try to find matching file
+            if file_params and model_version_id:
+                target_type = file_params.get("type", "Model")
+                target_format = file_params.get("format", "SafeTensor")
+                target_size = file_params.get("size", "full")
+                target_fp = file_params.get("fp")
+                is_primary = file_params.get("isPrimary", False)
+                
+                if is_primary:
+                    # Find primary file
+                    file_info = next(
+                        (f for f in files if f.get("primary") and f.get("type") in ("Model", "Negative")),
+                        None
+                    )
+                else:
+                    # Match by metadata
+                    for f in files:
+                        f_type = f.get("type", "")
+                        f_meta = f.get("metadata", {})
+                        
+                        # Check type match
+                        if f_type != target_type:
+                            continue
+                        
+                        # Check metadata match
+                        if f_meta.get("format") != target_format:
+                            continue
+                        if f_meta.get("size") != target_size:
+                            continue
+                        if target_fp and f_meta.get("fp") != target_fp:
+                            continue
+                        
+                        file_info = f
+                        break
+            
+            # Fallback to primary file if no match found
+            if not file_info:
                 file_info = next(
                     (
                         f
-                    for f in version_info.get("files", [])
+                        for f in files
                         if f.get("primary") and f.get("type") in ("Model", "Negative")
                     ),
                     None,
                 )
+            
             if not file_info:
-                return {"success": False, "error": "No primary file found in metadata"}
+                return {"success": False, "error": "No suitable file found in metadata"}
             mirrors = file_info.get("mirrors") or []
             download_urls = []
             if mirrors: