fix(upscaler): support data URL (base64) input — write to temp file for handle_file

app.py

@@ -1,3 +1,5 @@
+import base64
+import tempfile
 import gradio as gr
 from gradio_client import Client, handle_file
 from daggr import FnNode, GradioNode, Graph
@@ -35,13 +37,39 @@ def _image_to_filepath(image):
     return None
 
 
+def _path_for_api(path):
+    """Convert path (file path, URL, or data URL) to a path handle_file can use. Data URLs become temp files."""
+    if not path or not isinstance(path, str):
+        return None
+    if path.startswith("data:"):
+        # data:image/jpeg;base64,... -> decode and write to temp file (handle_file can't use data URL as filename)
+        try:
+            header, b64 = path.split(",", 1)
+            ext = "png"
+            if "jpeg" in header or "jpg" in header:
+                ext = "jpg"
+            elif "webp" in header:
+                ext = "webp"
+            data = base64.b64decode(b64)
+            f = tempfile.NamedTemporaryFile(suffix=f".{ext}", delete=False)
+            f.write(data)
+            f.close()
+            return f.name
+        except Exception as e:
+            raise RuntimeError(f"Upscaler: could not decode data URL: {e}") from e
+    return path
+
+
 # 2. Image Upscaler (FnNode so we pass a single filepath string; GradioNode was receiving a list from Daggr)
 def run_upscaler(image, model_selection="4xBHI_dat2_real"):
     """Call Phips/Upscaler API with a single filepath string. Returns path to upscaled image."""
     path = _image_to_filepath(image)
     if not path:
         return None
-    # Phips/Upscaler runs on a different server - send file content via handle_file so it can read the image (local path is not visible there).
+    path = _path_for_api(path)
+    if not path:
+        return None
+    # Phips/Upscaler runs on a different server - send file content via handle_file so it can read the image.
     try:
         image_arg = handle_file(path)
     except Exception as e: