Example usage for com.google.common.net HttpHeaders CONTENT_TYPE

Introduction

In this page you can find the example usage for com.google.common.net HttpHeaders CONTENT_TYPE.

Prototype

String CONTENT_TYPE

To view the source code for com.google.common.net HttpHeaders CONTENT_TYPE.

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Document

The HTTP Content-Type header field name.

Usage

From source file:org.gaul.s3proxy.S3ProxyHandler.java

/**
 * Create Amazon V2 signature.  Reference:
 * http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html
 *//* w  w w. j av a  2  s. c  om*/
private static String createAuthorizationSignature(HttpServletRequest request, String uri, String identity,
        String credential) {
    // sort Amazon headers
    SortedSetMultimap<String, String> canonicalizedHeaders = TreeMultimap.create();
    for (String headerName : Collections.list(request.getHeaderNames())) {
        Collection<String> headerValues = Collections.list(request.getHeaders(headerName));
        headerName = headerName.toLowerCase();
        if (!headerName.startsWith("x-amz-")) {
            continue;
        }
        if (headerValues.isEmpty()) {
            canonicalizedHeaders.put(headerName, "");
        }
        for (String headerValue : headerValues) {
            canonicalizedHeaders.put(headerName, Strings.nullToEmpty(headerValue));
        }
    }

    // build string to sign
    StringBuilder builder = new StringBuilder().append(request.getMethod()).append('\n')
            .append(Strings.nullToEmpty(request.getHeader(HttpHeaders.CONTENT_MD5))).append('\n')
            .append(Strings.nullToEmpty(request.getHeader(HttpHeaders.CONTENT_TYPE))).append('\n');
    String expires = request.getParameter("Expires");
    if (expires != null) {
        builder.append(expires);
    } else if (!canonicalizedHeaders.containsKey("x-amz-date")) {
        builder.append(request.getHeader(HttpHeaders.DATE));
    }
    builder.append('\n');
    for (Map.Entry<String, String> entry : canonicalizedHeaders.entries()) {
        builder.append(entry.getKey()).append(':').append(entry.getValue()).append('\n');
    }
    builder.append(uri);

    char separator = '?';
    List<String> subresources = Collections.list(request.getParameterNames());
    Collections.sort(subresources);
    for (String subresource : subresources) {
        if (SIGNED_SUBRESOURCES.contains(subresource)) {
            builder.append(separator).append(subresource);

            String value = request.getParameter(subresource);
            if (!"".equals(value)) {
                builder.append('=').append(value);
            }
            separator = '&';
        }
    }

    String stringToSign = builder.toString();
    logger.trace("stringToSign: {}", stringToSign);

    // sign string
    Mac mac;
    try {
        mac = Mac.getInstance("HmacSHA1");
        mac.init(new SecretKeySpec(credential.getBytes(StandardCharsets.UTF_8), "HmacSHA1"));
    } catch (InvalidKeyException | NoSuchAlgorithmException e) {
        throw Throwables.propagate(e);
    }
    return BaseEncoding.base64().encode(mac.doFinal(stringToSign.getBytes(StandardCharsets.UTF_8)));
}

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