Amazon Api 簽名演算法（golang版和java版）

這是一個建立於 的文章，其中的資訊可能已經有所發展或是發生改變。

package mainimport "fmt"import "crypto/hmac"import "crypto/sha256"import "time"import "strings"import "encoding/base64"import "net/http"import "net/url"import "io/ioutil"const METHOD ="GET"const HOST ="webservices.amazon.com"const URI= "/onca/xml"const QUERY_STRING= "AWSAccessKeyId=121212121212&AssociateTag=smasholab-20&IdType=ISBN&ItemId=B000MQTJW2&Operation=ItemLookup&Service=AWSECommerceService&Timestamp=%s"func main() {t := time.Now()tm:= t.Format("2006-01-02T15:04:05Z")tm= url.QueryEscape(tm)fmt.Println("tm:", tm)query := fmt.Sprintf(QUERY_STRING, tm)ul := fmt.Sprintf(QUERY_STRING, tm)fmt.Println("query:", query)//AWSAccessKeyId := "sssbbbsssbbb"AWSSecretKeyId := "ooxxooxx"sha256 := sha256.Newhash := hmac.New(sha256, []byte(AWSSecretKeyId))template:= "%s\n%s\n%s\n%s"template= fmt.Sprintf(template, METHOD, HOST, URI, query)fmt.Println("template:", template)hash.Write([]byte(template))sha := base64.StdEncoding.EncodeToString(hash.Sum(nil))sha= url.QueryEscape(sha)fmt.Println("sha", sha)ul=  ul + "&Signature=" +shaul= "http://webservices.amazon.com/onca/xml?"+ ul ul= strings.Replace(ul, "+", "%20", -1)ul= strings.Replace(ul, "*", "%2A", -1)ul= strings.Replace(ul, "%7E", "~", -1)fmt.Println("url:", ul)//requestresponse, err := http.Get(ul)if err != nil {fmt.Println("err", err)}else{content, _ := ioutil.ReadAll(response.Body) println("response", string(content))response.Body.Close()}}

------------------------下面是java版的，稍微囉嗦點----------------------------------

package com.amazon.associates.sample;import java.io.UnsupportedEncodingException;import java.net.URLDecoder;import java.net.URLEncoder;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.SortedMap;import java.util.TimeZone;import java.util.TreeMap;import javax.crypto.Mac;import javax.crypto.spec.SecretKeySpec;import org.apache.commons.codec.binary.Base64;public class SignedRequestsHelper {  private static final String UTF8_CHARSET = "UTF-8";  private static final String HMAC_SHA256_ALGORITHM = "HmacSHA256";  private static final String REQUEST_URI = "/onca/xml";  private static final String REQUEST_METHOD = "GET";  private String endpoint = "webservices.amazon.com"; // must be lowercase  private String awsAccessKeyId = "YOUR AWS ACCESS KEY";  private String awsSecretKey = "YOUR AWS SECRET KEY";  private SecretKeySpec secretKeySpec = null;  private Mac mac = null;  public SignedRequestsHelper() {    byte[] secretyKeyBytes = awsSecretKey.getBytes(UTF8_CHARSET);    secretKeySpec =      new SecretKeySpec(secretyKeyBytes, HMAC_SHA256_ALGORITHM);    mac = Mac.getInstance(HMAC_SHA256_ALGORITHM);    mac.init(secretKeySpec);  }  public String sign(Map<String, String> params) {    params.put("AWSAccessKeyId", awsAccessKeyId);    params.put("Timestamp", timestamp());    SortedMap<String, String> sortedParamMap =      new TreeMap<String, String>(params);    String canonicalQS = canonicalize(sortedParamMap);    String toSign =      REQUEST_METHOD + "\n"      + endpoint + "\n"      + REQUEST_URI + "\n"      + canonicalQS;    String hmac = hmac(toSign);    String sig = percentEncodeRfc3986(hmac);    String url = "http://" + endpoint + REQUEST_URI + "?" +    canonicalQS + "&Signature=" + sig;    return url;  }  private String hmac(String stringToSign) {    String signature = null;    byte[] data;    byte[] rawHmac;    try {      data = stringToSign.getBytes(UTF8_CHARSET);      rawHmac = mac.doFinal(data);      Base64 encoder = new Base64();      signature = new String(encoder.encode(rawHmac));    } catch (UnsupportedEncodingException e) {      throw new RuntimeException(UTF8_CHARSET + " is unsupported!", e);    }    return signature;  }  private String timestamp() {    String timestamp = null;    Calendar cal = Calendar.getInstance();    DateFormat dfm = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");    dfm.setTimeZone(TimeZone.getTimeZone("GMT"));    timestamp = dfm.format(cal.getTime());    return timestamp;  }  private String canonicalize(SortedMap<String, String> sortedParamMap){    if (sortedParamMap.isEmpty()) {      return "";    }    StringBuffer buffer = new StringBuffer();    Iterator<Map.Entry<String, String>> iter =      sortedParamMap.entrySet().iterator();    while (iter.hasNext()) {      Map.Entry<String, String> kvpair = iter.next();      buffer.append(percentEncodeRfc3986(kvpair.getKey()));      buffer.append("=");      buffer.append(percentEncodeRfc3986(kvpair.getValue()));      if (iter.hasNext()) {        buffer.append("&");      }    }    String canonical = buffer.toString();    return canonical;  }  private String percentEncodeRfc3986(String s) {    String out;    try {      out = URLEncoder.encode(s, UTF8_CHARSET)      .replace("+", "%20")      .replace("*", "%2A")      .replace("%7E", "~");    } catch (UnsupportedEncodingException e) {      out = s;    }    return out;  }}