AWS SignatureDoesNotMatch

Receiving:

SignatureDoesNotMatch The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.

With the following:

String associateTag = "example-20";
String awsAccessKeyId = "accessKeyId";
String awsSecretKey = "secretKey";
String endpoint = "webservices.amazon.com";
String uri = "/onca/xml";
String charset = "UTF8";

private String buildQueryString(String keywords) {
    Map<String,String> params = new ArrayMap<>();
    List<String> pairs = new ArrayList<>();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
    sdf.setTimeZone(TimeZone.getTimeZone("UTC"));

    params.put("Service","AWSECommerceService");
    params.put("Operation","ItemSearch");
    params.put("AWSAccessKeyId",awsAccessKeyId);
    params.put("AssociateTag",associateTag);
    params.put("SearchIndex","All");
    params.put("ResponseGroup","Images,ItemAttributes");
    params.put("Timestamp",sdf.format(new Date()));
    params.put("Keywords", keywords);

    Map<String, String> treeMap = new TreeMap<>(params);
    try {
        for (Map.Entry<String, String> param : treeMap.entrySet()) {
            pairs.add(URLEncoder.encode(param.getKey(), charset) + "=" + URLEncoder.encode(param.getValue(), charset));
        }
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }

    String queryString = "";
    for (int i = 0; i < pairs.size(); i++) {
        if (i != 0) {
            queryString += "&";
        }

        queryString += pairs.get(i);
    }

    Log.d(TAG, "queryString: " + queryString);

    return queryString;
}

private String buildSignature(String queryString) {
    String hash = "";

    try {
        String message = "GETn" + endpoint + "n" + uri + "n" + queryString;
        Log.d(TAG, "message: " + message);

        Mac sha_HMAC = Mac.getInstance("HmacSHA256");

        SecretKeySpec secret_key = new SecretKeySpec(awsSecretKey.getBytes(charset), "HmacSHA256");
        sha_HMAC.init(secret_key);

        hash = Base64.encodeToString(sha_HMAC.doFinal(message.getBytes(charset)), Base64.DEFAULT);
    }
    catch (Exception e){
        System.out.println("Error");
    }

    return hash;
}

public void searchProducts(String keywords) {
    String requestUrl = "";
    String queryString = buildQueryString(keywords);
    String signature = buildSignature(queryString);

    Log.d(TAG, "signature: " + signature);

    try {
        requestUrl = "http://" + endpoint + uri + "?" + queryString + "&Signature=" + URLEncoder.encode(signature, charset);
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }

    Log.d(TAG, "requestUrl: " + requestUrl);

        Ion.with(context)
            .load(requestUrl)
            .asString()
            .setCallback(new FutureCallback<String>() {
                @Override
                public void onCompleted(Exception e, String result) {
                    Log.d(TAG, "searchProducts result: " + result);
                }
            });
}

What could be the problem?

---

Make sure that your system clock is correct. It will be good idea to sync it using NTP. In the past I have seen signature errors when the time is out of sync.

---

What I've seen before is that this is normally down to permissions . Check access and secret key is correct and you have adequate permissions.

---

Changed:

Base64.DEFAULT;

To:

Base64.NO_WRAP;

链接地址: http://www.djcxy.com/p/38998.html

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