无法使用java代码计算aws s3的授权码？

Question

我正在尝试使用java代码计算aws授权码，但由于出现错误，这是不起作用的：

String host = "bucketname" + ".s3-us-east-2.amazonaws.com";
        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.HOUR_OF_DAY, 24);
        long expireTime = cal.getTimeInMillis() / 1000;

        String signString = "GET\n" +
            "\n" +
            "\n" +
            expireTime + "\n" +
            "/" + "testingsagar" + "location";

        SecretKeySpec signingKey = new SecretKeySpec(SECRET_KEY.getBytes(), HMAC_SHA1_ALGORITHM);
        Mac mac = Mac.getInstance(HMAC_SHA1_ALGORITHM);
        mac.init(signingKey);
        String signature = URLEncoder.encode(new String(Base64.getEncoder().encode(mac.doFinal(signString.getBytes()))));

        System.out.println(signature);
        String fullPayload = "?AWSAccessKeyId=" + ACCESS_KEY +
            "&Expires=" + expireTime + 
            "&Signature=" + signature;

        System.out.println("http" + "://" + host + "" + fullPayload);

谁能建议我java代码，我可以用来计算授权码。提前感谢

Answer 1

要签名的字符串实际上缺少几个元素，例如区域(参见https://docs.aws.amazon.com/general/latest/gr/sigv4_elements.html)

请参阅此处的Java代码示例https://docs.aws.amazon.com/general/latest/gr/signature-v4-examples.html#signature-v4-examples-java

AWS SDK for Java有一个签名者组件，可以为您实现这一点-无需编写您自己的代码https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/AWS4Signer.html