public static String buildStringToSign()

in src/main/java/com/alibaba/cloudapi/sdk/util/SignUtil.java [81:117]
23 lines of code
5 McCabe index (conditional complexity)

    public static String buildStringToSign(ApiRequest apiRequest) {

        StringBuilder sb = new StringBuilder();
        sb.append(apiRequest.getMethod().getValue()).append(SdkConstant.CLOUDAPI_LF);

        //如果有@"Accept"头，这个头需要参与签名
        if (apiRequest.getFirstHeaderValue(HttpConstant.CLOUDAPI_HTTP_HEADER_ACCEPT) != null) {
            sb.append(apiRequest.getFirstHeaderValue(HttpConstant.CLOUDAPI_HTTP_HEADER_ACCEPT));
        }
        sb.append(SdkConstant.CLOUDAPI_LF);

        //如果有@"Content-MD5"头，这个头需要参与签名
        if (apiRequest.getFirstHeaderValue(HttpConstant.CLOUDAPI_HTTP_HEADER_CONTENT_MD5) != null) {
            sb.append(apiRequest.getFirstHeaderValue(HttpConstant.CLOUDAPI_HTTP_HEADER_CONTENT_MD5));
        }
        sb.append(SdkConstant.CLOUDAPI_LF);

        //如果有@"Content-Type"头，这个头需要参与签名
        if (apiRequest.getFirstHeaderValue(HttpConstant.CLOUDAPI_HTTP_HEADER_CONTENT_TYPE) != null) {
            sb.append(apiRequest.getFirstHeaderValue(HttpConstant.CLOUDAPI_HTTP_HEADER_CONTENT_TYPE));
        }
        sb.append(SdkConstant.CLOUDAPI_LF);

        //签名优先读取HTTP_CA_HEADER_DATE，因为通过浏览器过来的请求不允许自定义Date（会被浏览器认为是篡改攻击）
        if (apiRequest.getFirstHeaderValue(HttpConstant.CLOUDAPI_HTTP_HEADER_DATE) != null) {
            sb.append(apiRequest.getFirstHeaderValue(HttpConstant.CLOUDAPI_HTTP_HEADER_DATE));
        }
        sb.append(SdkConstant.CLOUDAPI_LF);

        //将headers合成一个字符串
        sb.append(buildHeaders(apiRequest));

        //将path、queryParam、formParam合成一个字符串
        sb.append(buildResource(apiRequest));

        return sb.toString();
    }