if _, ok := query[v4PresignQueryParam]; !ok {
			return ErrInvalidQueryParams
		}
	}
	return ErrNone
}

// Parses all the presigned signature values into separate elements.
func parsePreSignV4(query url.Values, region string, stype serviceType) (psv preSignValues, aec APIErrorCode) {
	// verify whether the required query params exist.
	aec = doesV4PresignParamsExist(query)
	if aec != ErrNone {
		return psv, aec

		for j := 0; j < len(testCase.inputQueryKeyVals)-1; j += 2 {
			inputQuery.Set(testCase.inputQueryKeyVals[j], testCase.inputQueryKeyVals[j+1])
		}
		// call the function under test.
		parsedPreSign, actualErrCode := parsePreSignV4(inputQuery, "", serviceS3)
		if testCase.expectedErrCode != actualErrCode {
			t.Fatalf("Test %d: Expected the APIErrCode to be %d, got %d", i+1, testCase.expectedErrCode, actualErrCode)
		}