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OAuthService.java

/**
 * Copyright (c) 2013 Nokia Corporation. All rights reserved.
 * Nokia and Nokia Connecting People are registered trademarks of Nokia Corporation. 
 * Oracle and Java are trademarks or registered trademarks of Oracle and/or its
 * affiliates. Other product and company names mentioned herein may be trademarks
 * or trade names of their respective owners. 
 * See license text file delivered with this project for more information.
 */

package com.nokia.example.statusshout.engine;

import javax.microedition.content.Invocation;
import javax.microedition.content.Registry;
import javax.microedition.content.ResponseListener;
import javax.microedition.midlet.MIDlet;

/**
 * Common base class for service utilising OAuth authentication.
 */
public abstract class OAuthService implements ResponseListener {
    // Constants
    private static final String TAG = "OAuthService.";
    private static final String BROWSER_ID = "com.nokia.browser";

    // Members
    protected MIDlet midlet;
    protected ShareListener listener;

    /**
     * Constructor.
     * 
     * @param listener The listener for events.
     * @throws NullPointerException If the given MIDlet instance is null.
     */
    protected OAuthService(MIDlet midlet, ShareListener listener)
        throws NullPointerException
    {
        if (midlet == null) {
            throw new NullPointerException(TAG + "OAuthService(): MIDlet is null!");
        }
        
        this.midlet = midlet;
        this.listener = listener;
    }

    /**
     * Authenticates the user.
     */
    public abstract void authenticate();

    /**
     * Checks whether the given token is valid or not.
     * 
     * @param token The token to check.
     * @return True if the token is valid, false otherwise.
     */
    public abstract boolean isValid(final String token);

    /**
     * Adds the given service as a listener for the content handler. There can
     * be only one listener at a time so this needs to be called, if the service
     * needs to get callbacks to ResponseListener.invocationResponseNotify().
     *  
     * @param service An instance deriving from this class.
     */
    protected void setAsListener(OAuthService service) {
        Registry.getRegistry(midlet.getClass().getName()).setListener(service);
    }

    /**
     * Creates OAuth invocation.
     * 
     * @param loginUrl The URL to navigate to.
     * @param redirectUrl The URL where browser redirects after a successful
     * login.
     */
    protected void createInvocation(final String loginUrl, final String redirectUrl) {
        System.out.println(TAG + "createInvocation(): " + loginUrl + ", " + redirectUrl);
        
        Invocation invocation = new Invocation();
        invocation.setURL(loginUrl);
        invocation.setID(BROWSER_ID);
        invocation.setArgs(new String[] { "mode=proxy", "redirect_intercept=" + redirectUrl });
        invocation.setResponseRequired(true);
        
        try {
            Registry.getRegistry(midlet.getClass().getName()).invoke(invocation);
        }
        catch (Exception e) {
            System.out.println(TAG + "createInvocation(): " + e.toString());
            
            if (listener != null) {
                listener.onError(e.toString());
            }
        }
    }
}

Last updated 10 October 2013

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