private static String buildHeaders()

in src/main/java/com/alibaba/cloudapi/sdk/util/SignUtil.java [201:229]

• 21 lines of code
• 5 McCabe index (conditional complexity)

    private static String buildHeaders(ApiHttpMessage apiHttpMessage) {
        //使用TreeMap,默认按照字母排序
        Map<String, String> headersToSign = new TreeMap<String, String>();


        StringBuilder signHeadersStringBuilder = new StringBuilder();

        int flag = 0;
        for (Map.Entry<String, List<String>> header : apiHttpMessage.getHeaders().entrySet()) {
            if (header.getKey().startsWith(SdkConstant.CLOUDAPI_CA_HEADER_TO_SIGN_PREFIX_SYSTEM)) {
                if (flag != 0) {
                    signHeadersStringBuilder.append(",");
                }
                flag++;
                signHeadersStringBuilder.append(header.getKey());
                headersToSign.put(header.getKey(), apiHttpMessage.getFirstHeaderValue(header.getKey()));
            }
        }

        //同时所有加入签名的头的列表，需要用逗号分隔形成一个字符串，加入一个新HTTP头@"X-Ca-Signature-Headers"
        apiHttpMessage.addHeader(SdkConstant.CLOUDAPI_X_CA_SIGNATURE_HEADERS, signHeadersStringBuilder.toString());


        StringBuilder sb = new StringBuilder();
        for (Map.Entry<String, String> e : headersToSign.entrySet()) {
            sb.append(e.getKey()).append(':').append(e.getValue()).append(SdkConstant.CLOUDAPI_LF);
        }
        return sb.toString();
    }