fixed GGUF model upload instability

backend/open_webui/utils/misc.py

@@ -244,11 +244,12 @@ def get_gravatar_url(email):
     return f"https://www.gravatar.com/avatar/{hash_hex}?d=mp"
 
 
-def calculate_sha256(file):
+def calculate_sha256(file_path, chunk_size):
+    #Compute SHA-256 hash of a file efficiently in chunks
     sha256 = hashlib.sha256()
-    # Read the file in chunks to efficiently handle large files
-    for chunk in iter(lambda: file.read(8192), b""):
-        sha256.update(chunk)
+    with open(file_path, "rb") as f:
+        while chunk := f.read(chunk_size):
+            sha256.update(chunk)
     return sha256.hexdigest()