From 2ac7fee0177ac670ee1cca580c3d8cfb269b9530 Mon Sep 17 00:00:00 2001
From: jiuker <2818723467@qq.com>
Date: Fri, 13 Oct 2023 22:31:23 +0800
Subject: [PATCH] fix: missing fileName will upload failed when
 PostPolicyBucketHandler (#18240)

---
 cmd/bucket-handlers.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cmd/bucket-handlers.go b/cmd/bucket-handlers.go
index cd3b06387..e2f292f32 100644
--- a/cmd/bucket-handlers.go
+++ b/cmd/bucket-handlers.go
@@ -1039,11 +1039,14 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 		break
 	}
 
-	if _, ok := formValues["Key"]; !ok {
+	if keyName, ok := formValues["Key"]; !ok {
 		apiErr := errorCodes.ToAPIErr(ErrMalformedPOSTRequest)
 		apiErr.Description = fmt.Sprintf("%s (%v)", apiErr.Description, errors.New("The name of the uploaded key is missing"))
 		writeErrorResponse(ctx, w, apiErr, r.URL)
 		return
+	} else if fileName == "" && len(keyName) >= 1 {
+		// if we can't get fileName. We use keyName[0] to fileName
+		fileName = keyName[0]
 	}
 
 	if fileName == "" {