com.facebook.android.FacebookClient.java Source code

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Here is the source code for com.facebook.android.FacebookClient.java

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/*
 * Copyright 2012 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.facebook.android;

import java.io.IOException;
import java.net.MalformedURLException;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.support.v4.app.Fragment;

/**
 * Extends the {@link Facebook} object so that it remembers the last access
 * token obtained from Facebook's servers.
 *
 * @author Lorenzo Villani
 */
public class FacebookClient extends Facebook {
    private static final String KEY_ACCESS_TOKEN = "access_token";
    private static final String KEY_ACCESS_EXPIRES = "access_expires";

    private final SharedPreferences mSharedPreferences;
    private final String mAccessToken;
    private final long mExpires;

    /**
     * Wraps a {@link DialogListener} saving the access token and its expiration
     * time when users complete the authorization process. Then forward the call
     * to the original {@link DialogListener}.
     *
     * @author Lorenzo Villani
     */
    private final class SaveTokenListener implements DialogListener {
        private final DialogListener mDelegate;

        /**
         * Constructor.
         *
         * @param delegate
         *            The delegate {@link DialogListener}.
         */
        public SaveTokenListener(final DialogListener delegate) {
            this.mDelegate = delegate;
        }

        @Override
        public void onComplete(final Bundle values) {
            final Editor editor = FacebookClient.this.mSharedPreferences.edit();

            editor.putString(KEY_ACCESS_TOKEN, getAccessToken());
            editor.putLong(KEY_ACCESS_EXPIRES, getAccessExpires());
            editor.commit();

            this.mDelegate.onComplete(values);
        }

        @Override
        public void onFacebookError(final FacebookError e) {
            this.mDelegate.onFacebookError(e);
        }

        @Override
        public void onError(final DialogError e) {
            this.mDelegate.onError(e);
        }

        @Override
        public void onCancel() {
            this.mDelegate.onCancel();
        }
    }

    /**
     * Constructor.
     *
     * @param context
     *            The application context.
     * @param appId
     *            This application's Facebook Application ID.
     * @since 1.0.0
     */
    public FacebookClient(final Context context, final Bundle savedInstanceState,
            final DialogListener dialogListener, final String appId) {
        super(appId);

        this.mSharedPreferences = context.getSharedPreferences("facebook", Context.MODE_PRIVATE);

        this.mAccessToken = this.mSharedPreferences.getString(KEY_ACCESS_TOKEN, null);

        this.mExpires = this.mSharedPreferences.getLong(KEY_ACCESS_EXPIRES, 0);

        if (this.mAccessToken != null) {
            setAccessToken(this.mAccessToken);
        }

        if (this.mExpires != 0) {
            setAccessExpires(this.mExpires);
        }

        Bundle fbdata = null;
        if (savedInstanceState != null && (fbdata = savedInstanceState.getBundle("facebookclient")) != null) {
            mAuthActivityCode = fbdata.getInt("mAuthActivityCode");
            mAuthPermissions = fbdata.getStringArray("mAuthPermissions");
        }

        mAuthDialogListener = new SaveTokenListener(dialogListener);
    }

    /*
     * Has the same effect of calling Logout, except this will
     * not make the auth.expireSession call. Use this when you
     * want to explicitly forget creditentials without having to 
     * worry about connectivity issues.
     */
    public void clear(Context context) {
        Util.clearCookies(context);
        setAccessToken(null);
        setAccessExpires(0);
        mSharedPreferences.edit().clear().commit();
    }

    public void onSaveInstanceState(Bundle outState) {
        Bundle b = new Bundle();
        b.putInt("mAuthActivityCode", mAuthActivityCode);
        b.putStringArray("mAuthPermissions", mAuthPermissions);
        outState.putBundle("facebookclient", b);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void authorize(final Activity activity, final DialogListener listener) {
        if (!isSessionValid()) {
            super.authorize(activity, new SaveTokenListener(listener));
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void authorize(final Activity activity, final String[] permissions, final DialogListener listener) {
        if (!isSessionValid()) {
            super.authorize(activity, permissions, new SaveTokenListener(listener));
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void authorize(final Activity activity, final String[] permissions, final int activityCode,
            final DialogListener listener) {
        if (!isSessionValid()) {
            super.authorize(activity, permissions, activityCode, new SaveTokenListener(listener));
        }
    }

    @Override
    public void authorize(final Fragment fragment, final String[] permissions, final DialogListener listener) {

        super.authorize(fragment, permissions, new SaveTokenListener(listener));
    }

}