Add more friendly error message for policy object (#7412)

cmd/api-errors.go

@@ -65,6 +65,7 @@ const (
 	ErrBadDigest
 	ErrEntityTooSmall
 	ErrEntityTooLarge
+	ErrPolicyTooLarge
 	ErrIncompleteBody
 	ErrInternalError
 	ErrInvalidAccessKeyID
@@ -398,6 +399,11 @@ var errorCodes = errorCodeMap{
 		Description:    "Your proposed upload exceeds the maximum allowed object size.",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrPolicyTooLarge: {
+		Code:           "PolicyTooLarge",
+		Description:    "Policy exceeds the maximum allowed document size.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	ErrIncompleteBody: {
 		Code:           "IncompleteBody",
 		Description:    "You did not provide the number of bytes specified by the Content-Length HTTP header.",

cmd/bucket-policy-handlers.go

@@ -71,7 +71,7 @@ func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *ht
 
 	// Error out if Content-Length is beyond allowed size.
 	if r.ContentLength > maxBucketPolicySize {
-		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrEntityTooLarge), r.URL, guessIsBrowserReq(r))
+		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrPolicyTooLarge), r.URL, guessIsBrowserReq(r))
 		return
 	}