s3: combine all signature verification checks into a single function (#7330)

weed/s3api/s3err/s3api_errors.go

@@ -102,6 +102,7 @@ const (
 	ErrContentSHA256Mismatch
 	ErrInvalidAccessKeyID
 	ErrRequestNotReadyYet
+	ErrRequestTimeTooSkewed
 	ErrMissingDateHeader
 	ErrInvalidRequest
 	ErrAuthNotSetup
@@ -432,6 +433,12 @@ var errorCodeResponse = map[ErrorCode]APIError{
 		HTTPStatusCode: http.StatusForbidden,
 	},
 
+	ErrRequestTimeTooSkewed: {
+		Code:           "RequestTimeTooSkewed",
+		Description:    "The difference between the request time and the server's time is too large.",
+		HTTPStatusCode: http.StatusForbidden,
+	},
+
 	ErrSignatureDoesNotMatch: {
 		Code:           "SignatureDoesNotMatch",
 		Description:    "The request signature we calculated does not match the signature you provided. Check your key and signing method.",