如何在不使用SDK的情况下将文件从Android上传到Amazon S3

Question

我一直在努力使用亚马逊S3的REST API将我的Android设备上的文件上传到我拥有的存储桶中.我有KEY和SECRET_KEY,但我不确定如何正确生成他们在请求中寻找的signatureValue.我正在为他们的服务器使用HttpPut,但我不确定如何正确生成signatureValue.到目前为止,这就是我所拥有的:

HttpPut put = new HttpPut(URL);

            String fmt = "EEE, dd MMM yyyy HH:mm:ss ";
            SimpleDateFormat format = new SimpleDateFormat(fmt, Locale.US);
            format.setTimeZone(TimeZone.getTimeZone("GMT"));

            String method = "PUT";
            String contentType = "application/octet-stream";
            String date = format.format(new Date()) + "GMT";
            String bucket = "/test-bucket52809/";

            StringBuffer buf = new StringBuffer();
            buf.append(method).append("\n\n");
            buf.append(contentType).append("\n");
            buf.append(date).append("\n");
            buf.append(bucket);

            String signature = percentEncodeRfc3986(hmac(buf.toString()));

然后是我用来生成签名值的方法:

    private void setupMac() throws UnsupportedEncodingException, NoSuchAlgorithmException, InvalidKeyException
    {

        byte[] secretyKeyBytes = KEY_SECRET.getBytes("UTF-8");
        signingKey = new SecretKeySpec(secretyKeyBytes, "HmacSHA256");
        mac = Mac.getInstance("HmacSHA256");
        mac.init(signingKey);
    }

    private String hmac(String stringToSign) {
        String signature = null;
        byte[] data;
        byte[] rawHmac;
        try {
            data = stringToSign.getBytes("UTF-8");
            rawHmac = mac.doFinal(data);
            signature = new String(Base64.encode(rawHmac, Base64.DEFAULT));
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("UTF-8" + " is unsupported!", e);
        }
        return signature;
    }

    private String percentEncodeRfc3986(String s) {
        String out;
        try {
            out = URLEncoder.encode(s, "UTF-8").replace("+", "%20")
                    .replace("*", "%2A").replace("%7E", "~");
        } catch (UnsupportedEncodingException e) {
            out = s;
        }
        return out;
    }

我使用了Amazon S3 Signature测试仪,我的字符串是正确的,但我从来没有得到正确的编码值.感谢您提供任何帮助或推动正确的方向.

Answer 1

import sun.misc.BASE64Encoder;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

String policy = (new BASE64Encoder()).encode(
    policy_document.getBytes("UTF-8")).replaceAll("\n","").replaceAll("\r","");

Mac hmac = Mac.getInstance("HmacSHA1");
hmac.init(new SecretKeySpec(
    aws_secret_key.getBytes("UTF-8"), "HmacSHA1"));
String signature = (new BASE64Encoder()).encode(
    hmac.doFinal(policy.getBytes("UTF-8")))
    .replaceAll("\n", "");

[参考： https: //aws.amazon.com/articles/1434]

上面的链接还描述了 HTTP 请求中的输入参数。