public static String buildCanonicalString()

in src/main/java/com/aliyun/oss/internal/SignV2Utils.java [82:151]
54 lines of code
17 McCabe index (conditional complexity)

    public static String buildCanonicalString(String method, String resourcePath, RequestMessage request, Set<String> additionalHeaderNames) {
        StringBuilder canonicalString = new StringBuilder();
        canonicalString.append(method).append(SignParameters.NEW_LINE);
        Map<String, String> headers = request.getHeaders();
        TreeMap<String, String> fixedHeadersToSign = new TreeMap<String, String>();
        TreeMap<String, String> canonicalizedOssHeadersToSign = new TreeMap<String, String>();

        if (headers != null) {
            for (Map.Entry<String, String> header : headers.entrySet()) {
                if (header.getKey() != null) {
                    String lowerKey = header.getKey().toLowerCase();
                    if (lowerKey.equals(HttpHeaders.CONTENT_TYPE.toLowerCase())
                            || lowerKey.equals(HttpHeaders.CONTENT_MD5.toLowerCase())
                            || lowerKey.equals(HttpHeaders.DATE.toLowerCase())) {
                        fixedHeadersToSign.put(lowerKey, header.getValue().trim());
                    } else if (lowerKey.startsWith(OSSHeaders.OSS_PREFIX)){
                        canonicalizedOssHeadersToSign.put(lowerKey, header.getValue().trim());
                    }
                }
            }
        }

        if (!fixedHeadersToSign.containsKey(HttpHeaders.CONTENT_TYPE.toLowerCase())) {
            fixedHeadersToSign.put(HttpHeaders.CONTENT_TYPE.toLowerCase(), "");
        }
        if (!fixedHeadersToSign.containsKey(HttpHeaders.CONTENT_MD5.toLowerCase())) {
            fixedHeadersToSign.put(HttpHeaders.CONTENT_MD5.toLowerCase(), "");
        }

        for (String additionalHeaderName : additionalHeaderNames) {
            if (additionalHeaderName != null && headers.get(additionalHeaderName) != null) {
                canonicalizedOssHeadersToSign.put(additionalHeaderName.toLowerCase(), headers.get(additionalHeaderName).trim());
            }
        }

        // Append fixed headers to sign to canonical string
        for (Map.Entry<String, String> entry : fixedHeadersToSign.entrySet()) {
            Object value = entry.getValue();

            canonicalString.append(value);
            canonicalString.append(SignParameters.NEW_LINE);
        }

        // Append canonicalized oss headers to sign to canonical string
        for (Map.Entry<String, String> entry : canonicalizedOssHeadersToSign.entrySet()) {
            String key = entry.getKey();
            Object value = entry.getValue();

            canonicalString.append(key).append(':').append(value).append(SignParameters.NEW_LINE);
        }


        // Append additional header names
        TreeSet<String> ts = new TreeSet<String>();
        for (String additionalHeaderName : additionalHeaderNames) {
            ts.add(additionalHeaderName.toLowerCase());
        }
        String separator = "";

        for (String additionalHeaderName : ts) {
            canonicalString.append(separator).append(additionalHeaderName);
            separator = ";";
        }
        canonicalString.append(SignParameters.NEW_LINE);

        // Append canonical resource to canonical string
        canonicalString.append(buildCanonicalizedResource(resourcePath, request.getParameters()));

        return canonicalString.toString();
    }