private String getSignature()

in src/main/java/com/aliyun/mns/client/impl/AbstractAction.java [273:313]
36 lines of code
6 McCabe index (conditional complexity)

    private String getSignature(RequestMessage request, String accessKeySecret) throws ClientException {
        if (StringUtils.isBlank(accessKeySecret)) {
            return null;
        }

        Map<String, String> headers = request.getHeaders();

        StringBuffer canonicalizedMNSHeaders = new StringBuffer();
        StringBuffer stringToSign = new StringBuffer();
        String contentMd5 = safeGetHeader(MNSConstants.CONTENT_MD5, headers);
        String contentType = safeGetHeader(MNSConstants.CONTENT_TYPE, headers);
        String date = safeGetHeader(MNSConstants.DATE, headers);
        String canonicalizedResource = getRelativeResourcePath(request
            .getResourcePath());

        TreeMap<String, String> tmpHeaders = sortHeader(request.getHeaders());
        if (tmpHeaders.size() > 0) {
            Set<String> keySet = tmpHeaders.keySet();
            for (String key : keySet) {
                if (key.toLowerCase().startsWith(
                    MNSConstants.X_HEADER_MNS_PREFIX)) {
                    canonicalizedMNSHeaders.append(key).append(":")
                        .append(tmpHeaders.get(key)).append("\n");
                }
            }
        }
        stringToSign.append(method).append("\n").append(contentMd5)
            .append("\n").append(contentType).append("\n").append(date)
            .append("\n").append(canonicalizedMNSHeaders)
            .append(canonicalizedResource);
        String signature;

        try {
            signature = ServiceSignature.create().computeSignature(
                accessKeySecret, stringToSign.toString());
        } catch (Exception e) {
            throw new ClientException("Signature fail", userRequestId, e);
        }

        return signature;
    }