Android Open Source - EdXVideoViewer Login Screen

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From Project

Back to project page EdXVideoViewer.

License

The source code is released under:

MIT License

Java Source Code

package com.github.krooken.edxvideoviewer;
/*from   ww w .  ja va  2  s .  c  o  m*/
import java.io.File;
import java.lang.Thread.UncaughtExceptionHandler;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.http.Header;

import android.os.Bundle;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class LoginScreen extends Activity {
  
  private static String TAG = "LoginScreenActivity";
  
  private final Handler handler = new Handler();
  private boolean loginInProgress = false;
  private boolean startupInProgress = true;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login_screen);
    
    if(!(Thread.getDefaultUncaughtExceptionHandler() instanceof UncaughtExceptionLogger)) {
      UncaughtExceptionHandler defaultUEH = Thread.getDefaultUncaughtExceptionHandler();
      File file = new File(getExternalFilesDir(null), "log-files");
      file.mkdir();
      Thread.setDefaultUncaughtExceptionHandler(
          new UncaughtExceptionLogger(file.getAbsolutePath(), defaultUEH));
    }
    
    Button loginButton = (Button)findViewById(R.id.login_button);
    
    loginButton.setOnClickListener(new OnClickListener() {
      
      @Override
      public void onClick(View v) {
        if(!loginInProgress) {
          String username = ((EditText)findViewById(R.id.username_field)).getText().toString();
          String password = ((EditText)findViewById(R.id.password_field)).getText().toString();
          boolean remember = ((CheckBox)findViewById(R.id.remember_field)).isChecked();
          tryLogin(username, password, remember);
        }
      }
    });
  }

  @Override
  protected void onStart() {
    super.onStart();
    
    Thread alreadyLoggedInThread = new Thread(new Runnable() {
      
      @Override
      public void run() {
        
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        String sessionId = prefs.getString("session_cookie", null);
        String edxLoggedIn = prefs.getString("edxloggedin_cookie", null);
        
        boolean loggedIn = false;
        
        if(sessionId != null && edxLoggedIn != null) {
          HttpGetRequest httpRequest = null;
          try {
            httpRequest = new HttpGetRequest(new URI(
                "https://courses.edx.org/dashboard"));
          } catch (URISyntaxException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          }
          
          httpRequest.addCookieHeader(sessionId);
          httpRequest.addCookieHeader(edxLoggedIn);
          
          httpRequest.executeGetRequest();
          
          if(httpRequest.getStatusCode() == 200) {
            loggedIn = true;
          } else {
            loggedIn = false;
          }
        } else {
          loggedIn = false;
        }
        
        if(loggedIn) {
          handler.post(new Runnable() {
            public void run() {
              alreadyLoggedIn();
            }
          });
        } else {
          handler.post(new Runnable() {
            
            @Override
            public void run() {
              needToLogIn();
            }
          });
        }
      }
    });
    alreadyLoggedInThread.start();
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.login_screen, menu);
    return true;
  }
  
  private void tryLogin(String username, String password, boolean remember) {

    final String postUsername = username;
    final String postPassword = password;
    final boolean postRemember = remember;
    
    Thread thread = new Thread(new Runnable(){

      @Override
      public void run() {
        HttpGetRequest httpRequest = null;
        try {
          httpRequest = new HttpGetRequest(new URI(
              "https://courses.edx.org/accounts/login?next=/dashboard"));
        } catch (URISyntaxException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
        httpRequest.executeGetRequest();
        Header[] headers = httpRequest.getResponseHeaders();
        
        String csrfToken = null;
        
        for(int i=0; i<headers.length; i++) {
          
          if(headers[i].getName().equals("Set-Cookie")) {
            String cookieString = headers[i].getValue();
            Pattern pattern = Pattern.compile("csrftoken=([^;]+);");
            Matcher matcher = pattern.matcher(cookieString);
            if(matcher.find()) {
              csrfToken = matcher.group(1);
              Log.d(TAG, "csrftoken: " + csrfToken);
            }
          }
        }
        
        if(csrfToken == null) {
          handler.post(new Runnable() {
            
            @Override
            public void run() {
              loginFailed("Cannot send login information");
            }
          });
          return;
        }
        
        HttpGetRequest loginRequest = null;
        try {
          loginRequest = new HttpGetRequest(new URI("https://courses.edx.org/login_ajax"));
        } catch (URISyntaxException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
        loginRequest.addCookieHeader("csrftoken=" + csrfToken);
        loginRequest.setReferer(
            "https://courses.edx.org/accounts/login?next=/dashboard");
        loginRequest.setXCsrfToken(csrfToken);
        loginRequest.addPostData("email", postUsername);
        loginRequest.addPostData("password", postPassword);
        if(postRemember) {
          loginRequest.addPostData("remember", "true");
        }
        loginRequest.executePostRequest();
        
        headers = loginRequest.getResponseHeaders();
        String sessioncookie = null;
        String edxloggedincookie = null;
        
        for(int i=0; i<headers.length; i++) {
          
          if(headers[i].getName().equals("Set-Cookie")) {
            String cookieString = headers[i].getValue();
            Pattern edxLoggedInPattern = Pattern.compile("edxloggedin=[^;]+;");
            Pattern sessionIdPattern = Pattern.compile("sessionid=[^;]+;");
            Matcher edxLoggedInMatcher = edxLoggedInPattern.matcher(cookieString);
            Matcher sessionIdMatcher = sessionIdPattern.matcher(cookieString);
            
            if(edxLoggedInMatcher.find()) {
              edxloggedincookie = edxLoggedInMatcher.group(0);
              Log.d(TAG, "EdxLoggedInCookie: " + edxloggedincookie);
            }
            if(sessionIdMatcher.find()) {
              sessioncookie = sessionIdMatcher.group(0);
              Log.d(TAG, "SessionIdCookie: " + sessioncookie);
            }
          }
        }
        
        if(sessioncookie != null 
            && edxloggedincookie != null 
            && edxloggedincookie.equalsIgnoreCase("edxloggedin=true;")) {
          
          final String session = sessioncookie;
          final String edxloggedin = edxloggedincookie;
          
          handler.post(new Runnable() {
            public void run() {
              loginSuccessful(session, edxloggedin);
            }
          });
        } else {
          handler.post(new Runnable() {
            
            @Override
            public void run() {
              loginFailed("Username or password is incorrect!");
            }
          });
        }
      }
      
    });
    
    loginInProgress = true;
    ((Button)findViewById(R.id.login_button)).setEnabled(false);
    ((TextView)findViewById(R.id.login_error_message_text)).setVisibility(View.GONE);
    ((ProgressBar)findViewById(R.id.login_in_progress_bar)).setVisibility(View.VISIBLE);
    thread.start();
  }
  
  private void loginSuccessful(String sessionId, String edxLoggedIn) {
    SharedPreferences.Editor prefsEditor = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).edit();
    prefsEditor.putString("session_cookie", sessionId);
    prefsEditor.putString("edxloggedin_cookie", edxLoggedIn);
    prefsEditor.commit();
    
    String cookieString = sessionId + edxLoggedIn;
    leaveLoginActivity(cookieString);
    loginProgressStop();
  }
  
  private void loginFailed(String errorMessage) {
    TextView errorMessageView = (TextView)findViewById(R.id.login_error_message_text);
    errorMessageView.setText(errorMessage);
    loginProgressStop();
    ((TextView)findViewById(R.id.login_error_message_text)).setVisibility(View.VISIBLE);
  }
  
  private void loginProgressStop() {
    loginInProgress = false;
    ((Button)findViewById(R.id.login_button)).setEnabled(true);
    ((ProgressBar)findViewById(R.id.login_in_progress_bar)).setVisibility(View.GONE);
  }
  
  private void alreadyLoggedIn() {
    SharedPreferences prefs = getPreferences(Context.MODE_PRIVATE);
    String cookies = prefs.getString("session_cookie", "") +
        prefs.getString("edxloggedin_cookie", "");
    leaveLoginActivity(cookies);
  }
  
  private void needToLogIn() {
    ((ProgressBar)findViewById(R.id.already_logged_in_progress_bar)).setVisibility(View.GONE);
    ((RelativeLayout)findViewById(R.id.login_form_container)).setVisibility(View.VISIBLE);
    startupInProgress = false;
  }
  
  private void leaveLoginActivity(String cookies) {
    Intent intent = new Intent(LoginScreen.this, CourseViewer.class);
    intent.putExtra("cookie_data", cookies);
    startActivity(intent);
  }

}

Java Source Code List

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