I am trying to follow step by step instructions at https://dev.twitter.com/docs/auth/oauth to connect Twitter from Java code (not using any connection libraries)
I have tried my best for 2-3 days but something is terribly wrong in what I am doing. Please can someone advice?
package com.xxxx;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
public class TwitterTest {
static final String TwitterUri = "https://api.twitter.com/oauth/request_token";
static final String TwitterClientID = "qU0D...................Wt1A";
static final String TwitterClientSecret = "eQdRIZ..........................lP8oPUs";
static final String TwitterRedirectUri = "http://www.amobs.co.uk/thandler.php";
public static void main(String args[]){
try{
new TwitterTest().processTwitter();
}catch(Exception ex){
ex.printStackTrace();
}
}
public void processTwitter() throws Exception {
int millis = (int) System.currentTimeMillis() * -1;
int time = (int) millis / 1000;
//First, we sort all the parameters used in our request and formulate a signature base string.
String signatureBaseString = "POST&" +
URLEncoder.encode(TwitterUri, "UTF-8")+
"&" + "oauth_callback%3D"+ URLEncoder.encode(TwitterRedirectUri, "UTF-8")+
"%26oauth_consumer_key%3D"+ URLEncoder.encode(TwitterClientID, "UTF-8")+
"%26oauth_nonce%3D"+ URLEncoder.encode(String.valueOf(millis), "UTF-8")+
"%26oauth_signature_method%3D"+ URLEncoder.encode("HMAC-SHA1", "UTF-8")+
"%26oauth_timestamp%3D"+ URLEncoder.encode(String.valueOf(time), "UTF-8")+
"%26oauth_version%3D" + URLEncoder.encode("1.0", "UTF-8");
System.out.println("Signature Base: "+signatureBaseString);
//Our signing key is (notice the dangling ampersand at the end):
String signingKey = TwitterClientSecret + "&";
String signature = null;
try {
Mac mac = Mac.getInstance("HmacSHA1");
SecretKeySpec secret = new SecretKeySpec(signingKey.getBytes(),
"HmacSHA1");
mac.init(secret);
byte[] digest = mac.doFinal(signatureBaseString.getBytes());
//We then use the composite signing key to create an oauth_signature from the signature base string
signature = Base64.encodeBase64String(digest);
System.out.println("The resultant oauth_signature is: " +signature);
} catch (Exception ex1) {
ex1.printStackTrace();
System.exit(0);
}
//Now we just generate an HTTP header called "Authorization" with the relevant OAuth parameters for the request:
String oAuthParameters = "OAuth " +
"oauth_callback=\""+ URLEncoder.encode(TwitterRedirectUri, "UTF-8") + "\""
+ ", oauth_consumer_key=\""+ URLEncoder.encode(TwitterClientID, "UTF-8") + "\""
+ ", oauth_nonce=\""+ URLEncoder.encode(String.valueOf(millis), "UTF-8") + "\""
+ ", oauth_signature=\""+ URLEncoder.encode(signature, "UTF-8") + "\""
+ ", oauth_signature_method=\""+ URLEncoder.encode("HMAC-SHA1", "UTF-8") + "\""
+ ", oauth_timestamp=\""+ URLEncoder.encode(String.valueOf(time), "UTF-8") + "\""
+ ", oauth_version=\"" + URLEncoder.encode("1.0", "UTF-8")+ "\"";
System.out.println("oAuth Parameters are " +oAuthParameters);
//When Twitter.com receives our request, it will respond with an oauth_token, oauth_token_secret
//SO LET ME SEE IF I AM LUCKY!!!
URL url = new URL(TwitterUri);
HttpURLConnection conn = null;
try {
conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
//Set the oAuth params in header
conn.addRequestProperty("Authorization", oAuthParameters);
//Shall I set something in body?
String bodyParams =
"oauth_callback="+ URLEncoder.encode(TwitterRedirectUri, "UTF-8")
+ "&oauth_consumer_key="+ URLEncoder.encode(TwitterClientID, "UTF-8")
+ "&oauth_nonce="+ URLEncoder.encode(String.valueOf(millis), "UTF-8")
+ "&oauth_signature=" + URLEncoder.encode(signature, "UTF-8")
+ "&oauth_signature_method="+URLEncoder.encode("HMAC-SHA1", "UTF-8")
+ "&oauth_timestamp="+URLEncoder.encode(String.valueOf(time), "UTF-8")
+ "&oauth_version=" + URLEncoder.encode("1.0", "UTF-8");
System.out.println("Parameters for body are " +oAuthParameters);
OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
writer.write(bodyParams);
writer.flush();
conn.connect();
// Get Response
InputStream is = conn.getInputStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
String line;
StringBuffer dataBack = new StringBuffer();
while ((line = rd.readLine()) != null) {
dataBack.append(line);
dataBack.append('\r');
}
rd.close();
} catch (Exception e) {
System.err.println("And blasted!");
e.printStackTrace();
} finally {
if (conn != null) {
conn.disconnect();
}
}
}
}
