import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.*;


public class Proxy {
 static String consumerKey = "shiyou-top.blogspot.com";
 static String consumerSecret = "E3LSNU04y5wgfOxLbDfmy7JY";
 public static void requestToken(){
  String requestTokenUrl = "https://www.google.com/accounts/OAuthGetRequestToken?oauth_callback=oob&scope=https://www.googleapis.com/auth/buzz";
  requestTokenUrl = signRequest(requestTokenUrl);
  System.out.println(requestTokenUrl);
  try {
   System.out.println(getUrlData(requestTokenUrl));
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  

       
  
 }
 
 private static String getUrlData(String url) throws IOException{
  URL myUrl = new URL(url);
  //取得 URLConnection    
  HttpURLConnection conn = (HttpURLConnection)myUrl.openConnection();
  System.err.println(conn);
  conn.setRequestMethod("GET"); 
  conn.connect();
  BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
     while ((reader.readLine()) != null){
         System.out.println(reader.readLine());  //印出結果  
     }
  return reader.readLine();
 }
 
 
 /*
  * Sign request method
  */
 
 //httpmethod is "get", without oauth_token_secret
 private static String signRequest(String url){
  /*
   * adding variables which used in url every time
   */
  
  url += "&oauth_consumer_key=" + consumerKey ;
  url += "&oauth_signature_method=HMAC-SHA1";
  int timestamp = Math.round(new Date().getTime() / 1000);
  url += "&oauth_timestamp=" + timestamp;
  url += "&oauth_nonce=" + (int)(Math.random() * 34 + 10);
  url += "&oauth_version=1.0";
  
  //split url
  String urlVariables = url.substring(url.indexOf("?") + 1);
  String urlVar[] = urlVariables.split("&");
  Arrays.sort(urlVar);
  
  //set stringToSign
  String sortedUrl = "";
  for(int i = 0; i < urlVar.length; i++){
   //if there is an url inside the hole url, encode it.
   if(urlVar[i].indexOf("://") > 0){
    String splitUrlVar[] = urlVar[i].split("=");
    try {
     splitUrlVar[1] = URLEncoder.encode(splitUrlVar[1], "UTF-8");
    } catch (UnsupportedEncodingException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    urlVar[i] = splitUrlVar[0] + "=" + splitUrlVar[1];
   }
   
   sortedUrl += urlVar[i];
   if(i != (urlVar.length - 1)){
    sortedUrl += "&";
   }    
  }
  url = url.substring(0,url.indexOf("?")) + "?" +sortedUrl;
  
  try {
   sortedUrl = URLEncoder.encode(sortedUrl,"UTF-8");
  } catch (UnsupportedEncodingException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  
  String encodeURL = null;
  try {
   encodeURL = URLEncoder.encode(url.substring(0,url.indexOf("?")),"UTF-8");
  } catch (UnsupportedEncodingException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  String stringToSign = "GET" + "&" + encodeURL + "&" + sortedUrl;
  
  String secret = consumerSecret + "&";
  
  
  String sign = hmac_sha1(stringToSign, secret);
  
  
  return url + "&oauth_signature=" + sign; 
 }
 
 

 private static String hmac_sha1(String data, String key){  
        byte[] b = HMACSHA1.getHmacSHA1(data, key);  
        String s = new BASE64Encoder().encode(b);  
        //System.out.println("hmacsha1 = " + s);  
        return s;
    } 
 
 public static void main(String[] args){
  requestToken();
 }
}