1
问题已解决 - 请参阅说明末尾的更新2。下面的代码是罚款亚马逊Alexa Web服务始终提供401
撕裂我的头发在这里...但这里有云：
我试图钩到亚马逊Alexa的API（http://docs.aws.amazon.com/AlexaWebInfoService/latest/index.html?ApiReference_UrlInfoAction.html）从API数据...我需要使用C＃。
我已经用Java代码更新了这篇文章，我用它来查看它是我的代码问题还是AWIS问题。
关于C＃，在这篇文章的末尾家伙声称它的工作：https://forums.aws.amazon.com/message.jspa?messageID=476573#476573
这是调用类的C＃代码：
var awis = new AmazonAWIS
{
AWSAccessKeyId = "ABCDRFGHIJKLMNOP",
AWSSecret = "GpC0PcXnnzG/TCpoi9r7RxBtqCzdKaHeEkq7Mfs6"
};
awis.UrlInfo("bbc.co.uk");
这是类码直接从上面贴的链接采取......我并没有改变它：
public class AmazonAWIS
{
public string AWSAccessKeyId { get; set; }
public string AWSSecret { get; set; }
protected string GenerateSignature(string param)
{
var sign = "GET\n" + "awis.amazonaws.com" + "\n/\n" + param;
// create the hash object
var shaiSignature = new HMACSHA256(Encoding.UTF8.GetBytes(AWSSecret));
// calculate the hash
var binSig = shaiSignature.ComputeHash(Encoding.UTF8.GetBytes(sign));
// convert to hex
var signature = Convert.ToBase64String(binSig);
return signature;
}
// this is one of the key problems with the Amazon code and C#.. C# by default returns excaped values in lower case
// for example %3a but Amazon expects them in upper case i.e. %3A, this function changes them to upper case..
//
public static string UpperCaseUrlEncode(string s)
{
char[] temp = HttpUtility.UrlEncode(s).ToCharArray();
for (int i = 0; i < temp.Length - 2; i++)
{
if (temp[i] == '%')
{
temp[i + 1] = char.ToUpper(temp[i + 1]);
temp[i + 2] = char.ToUpper(temp[i + 2]);
}
}
return new string(temp);
}
string GetQueryParams(string action, Dictionary<string, string> extra)
{
var time = DateTime.UtcNow;
// set the correct format for the date string
var timestamp = time.ToString("yyyy-MM-ddTHH:mm:ss.fffZ", System.Globalization.CultureInfo.InvariantCulture);
// create a sortable dict
var vals = new Dictionary<string, string>();
vals.Add("AWSAccessKeyId", AWSAccessKeyId);
vals.Add("Action", action);
vals.Add("ResponseGroup", "Rank,ContactInfo,LinksInCount");
vals.Add("Timestamp", timestamp);
vals.Add("Count", "10");
vals.Add("Start", "1");
vals.Add("SignatureVersion", "2");
vals.Add("SignatureMethod", "HmacSHA256");
// add any extra values
foreach (var v in extra)
{
if (vals.ContainsKey(v.Key) == false)
vals.Add(v.Key, v.Value);
}
// sort the values by ordinal.. important!
var sorted = vals.OrderBy(p => p.Key, StringComparer.Ordinal).ToArray();
var url = new StringBuilder();
foreach (var v in sorted)
{
if (url.Length > 0)
url.Append("&");
url.Append(v.Key + "=" + UpperCaseUrlEncode(v.Value));
}
return url.ToString();
}
public void UrlInfo(string domain)
{
string request = "UrlInfo";
// add the extra values
var extra = new Dictionary<string, string>();
extra.Add("Url", domain);
// run the request with amazon
try
{
var res = RunRequest(request, extra);
// process the results...
Console.WriteLine(res);
}
catch (Exception ex)
{
throw;
}
}
private string RunRequest(string request, Dictionary<string, string> extra)
{
// generate the query params
var queryParams = GetQueryParams(request, extra);
// calculate the signature
var sig = GenerateSignature(queryParams);
// generate the url
var url = new StringBuilder();
url.Append("http://awis.amazonaws.com?");
url.Append(queryParams);
url.Append("&Signature=" + UpperCaseUrlEncode(sig));
// get the request
var c = new WebClient();
var res = c.DownloadString(url.ToString());
return res;
}
}
它未能就行了：
var res = c.DownloadString(url.ToString());
我总是得到一个401未授权...
任何想法，我做错了什么？
更新
我可以重现这个同样的问题，他们的Java示例应用程序。我修改了他们的应用程序，只是硬编码AWSAccessId和SecretKey，而且我也不使用他们的应用程序中的sun.misc.BASE64Encoder。
确切的代码如下......再次，如果我抓住从makeRequest的（URI）声明的URI，粘贴到提琴手，我可以看到这是相同的401响应：
<?xml version="1.0"?>
AuthFailure AWS是不能够验证所提供的访问credentialsff8f1853-b816-47a0-2283-be9941e7f2a9
以及造成上面的代码（我已经改变了ACCESSKEY和秘密密钥）：
package urlinfo.com;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.security.SignatureException;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* Makes a request to the Alexa Web Information Service UrlInfo action.
*/
public class UrlInfo {
private static final String ACTION_NAME = "UrlInfo";
private static final String RESPONSE_GROUP_NAME = "Rank,ContactInfo,LinksInCount";
private static final String SERVICE_HOST = "awis.amazonaws.com";
private static final String AWS_BASE_URL = "http://" + SERVICE_HOST + "/?";
private static final String HASH_ALGORITHM = "HmacSHA256";
private static final String DATEFORMAT_AWS = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
private String accessKeyId;
private String secretAccessKey;
private String site;
public UrlInfo(String accessKeyId, String secretAccessKey, String site) {
this.accessKeyId = accessKeyId;
this.secretAccessKey = secretAccessKey;
this.site = site;
}
/**
* Generates a timestamp for use with AWS request signing
*
* @param date current date
* @return timestamp
*/
protected static String getTimestampFromLocalTime(Date date) {
SimpleDateFormat format = new SimpleDateFormat(DATEFORMAT_AWS);
format.setTimeZone(TimeZone.getTimeZone("GMT"));
return format.format(date);
}
/**
* Computes RFC 2104-compliant HMAC signature.
*
* @param data The data to be signed.
* @return The base64-encoded RFC 2104-compliant HMAC signature.
* @throws java.security.SignatureException
* when signature generation fails
*/
protected String generateSignature(String data)
throws java.security.SignatureException {
String result;
try {
// get a hash key from the raw key bytes
SecretKeySpec signingKey = new SecretKeySpec(
secretAccessKey.getBytes(), HASH_ALGORITHM);
// get a hasher instance and initialize with the signing key
Mac mac = Mac.getInstance(HASH_ALGORITHM);
mac.init(signingKey);
// compute the hmac on input data bytes
byte[] rawHmac = mac.doFinal(data.getBytes());
// base64-encode the hmac
// result = Encoding.EncodeBase64(rawHmac);
// result = new BASE64Encoder().encode(rawHmac);
result = javax.xml.bind.DatatypeConverter.printBase64Binary(rawHmac);
} catch (Exception e) {
throw new SignatureException("Failed to generate HMAC : "
+ e.getMessage());
}
return result;
}
/**
* Makes a request to the specified Url and return the results as a String
*
* @param requestUrl url to make request to
* @return the XML document as a String
* @throws IOException
*/
public static String makeRequest(String requestUrl) throws IOException {
URL url = new URL(requestUrl);
URLConnection conn = url.openConnection();
InputStream in = conn.getInputStream();
// Read the response
StringBuffer sb = new StringBuffer();
int c;
int lastChar = 0;
while ((c = in.read()) != -1) {
if (c == '<' && (lastChar == '>'))
sb.append('\n');
sb.append((char) c);
lastChar = c;
}
in.close();
return sb.toString();
}
/**
* Builds the query string
*/
protected String buildQuery()
throws UnsupportedEncodingException {
String timestamp = getTimestampFromLocalTime(Calendar.getInstance().getTime());
Map<String, String> queryParams = new TreeMap<String, String>();
queryParams.put("Action", ACTION_NAME);
queryParams.put("ResponseGroup", RESPONSE_GROUP_NAME);
queryParams.put("AWSAccessKeyId", accessKeyId);
queryParams.put("Timestamp", timestamp);
queryParams.put("Url", site);
queryParams.put("SignatureVersion", "2");
queryParams.put("SignatureMethod", HASH_ALGORITHM);
String query = "";
boolean first = true;
for (String name : queryParams.keySet()) {
if (first)
first = false;
else
query += "&";
query += name + "=" + URLEncoder.encode(queryParams.get(name), "UTF-8");
}
return query;
}
/**
* Makes a request to the Alexa Web Information Service UrlInfo action
*/
public static void main(String[] args) throws Exception {
String accessKey = "REMOVED";
String secretKey = "REMOVED";
// String site = args[2];
String site = "www.google.com";
UrlInfo urlInfo = new UrlInfo(accessKey, secretKey, site);
String query = urlInfo.buildQuery();
String toSign = "GET\n" + SERVICE_HOST + "\n/\n" + query;
System.out.println("String to sign:\n" + toSign + "\n");
String signature = urlInfo.generateSignature(toSign);
String uri = AWS_BASE_URL + query + "&Signature=" +
URLEncoder.encode(signature, "UTF-8");
System.out.println("Making request to:\n");
System.out.println(uri + "\n");
// Make the Request
String xmlResponse = makeRequest(uri);
// Print out the XML Response
System.out.println("Response:\n");
System.out.println(xmlResponse);
}
}
UPDATE 2：
这段代码没有问题。问题出在AWIS注册按钮上。使用页面底部的那个...而不是顶部的那个（这是大多数人会点击的）。亚马逊证实，顶部按钮目前无法正常工作。
您是否包含正确的访问密钥和机密？ – svenv
嗨，是的肯定。上述显然不正确（我改变了他们的这篇文章）。即使在使用他们的Java示例应用程序时，我也可以得到完全相同的结果，并使用全新的AWS账户新注册该服务。我开始相信Alexa AWIS的注册按钮有一个问题，特别是... – collumbo
远射，但请尝试在@字符串文字前加@;也许在秘密中有一个控制角色。 – svenv