net.kervala.comicsreader.BrowseRemoteAlbumsTask.java Source code

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Here is the source code for net.kervala.comicsreader.BrowseRemoteAlbumsTask.java

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/*
 * ComicsReader is an Android application to read comics
 * Copyright (C) 2011-2013 Cedric OCHS
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package net.kervala.comicsreader;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.WeakReference;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;

import org.json.JSONArray;
import org.json.JSONObject;
import org.xml.sax.SAXException;

import android.os.AsyncTask;
import android.util.Log;
import android.util.Xml;

public class BrowseRemoteAlbumsTask extends AsyncTask<String, Integer, String> {
    private final String mUrl;
    private final WeakReference<BrowserActivity> mActivity;
    private ArrayList<ThumbnailItem> mItems;

    public BrowseRemoteAlbumsTask(BrowserActivity activity, String url) {
        mActivity = new WeakReference<BrowserActivity>(activity);
        mUrl = url;
    }

    @Override
    protected void onPreExecute() {
        mActivity.get().showDialog(CommonActivity.DIALOG_WAIT);
    }

    private boolean parseJson(String json) {
        try {
            mItems = new ArrayList<ThumbnailItem>();

            JSONObject main = new JSONObject(json);

            JSONObject main2 = main.getJSONObject("albums");

            if (main2.has("folder")) {
                JSONArray folders = main2.getJSONArray("folder");

                for (int i = 0; i < folders.length(); i++) {
                    final JSONObject folder = folders.getJSONObject(i);
                    final String title = folder.getString("title");
                    final String url = folder.getString("url");

                    final BrowserItem item = new BrowserItem(title,
                            "..".equals(title) ? BrowserItem.TYPE_DIRECTORY_PARENT
                                    : BrowserItem.TYPE_DIRECTORY_CHILD,
                            true);
                    item.setAlbumUrl(url);

                    mItems.add(item);
                }
            }

            if (main2.has("album")) {
                JSONArray albums = main2.getJSONArray("album");

                for (int i = 0; i < albums.length(); i++) {
                    final JSONObject album = albums.getJSONObject(i);
                    final String title = album.getString("title");
                    final String url = album.getString("url");
                    final String thumbnail = album.getString("thumbnail");
                    final String filename = album.getString("filename");
                    int size = album.getInt("size");

                    final BrowserItem item = new BrowserItem(title, BrowserItem.TYPE_FILE, true);
                    item.setAlbumUrl(url);
                    item.setThumbnailUrl(thumbnail);
                    item.setFilename(filename);
                    item.setSize(size);

                    mItems.add(item);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }

        return true;
    }

    private boolean parseXml(String xml) {
        try {
            final AlbumsIndexHandler handler = new AlbumsIndexHandler();

            Xml.parse(xml, handler);

            mItems = handler.getItems();
        } catch (SAXException e) {
            //         error = e.toString();
            e.printStackTrace();
            return false;
        }

        return true;
    }

    @Override
    protected String doInBackground(String... params) {
        String error = null;

        URL url = null;

        try {
            // open a stream on URL
            url = new URL(mUrl);
        } catch (MalformedURLException e) {
            error = e.toString();
            e.printStackTrace();
        }

        boolean retry = false;
        HttpURLConnection urlConnection = null;
        int resCode = 0;

        do {
            // create the new connection
            ComicsAuthenticator.sInstance.reset();

            if (urlConnection != null) {
                urlConnection.disconnect();
            }

            try {
                urlConnection = (HttpURLConnection) url.openConnection();
                urlConnection.setConnectTimeout(ComicsParameters.TIME_OUT);
                urlConnection.setReadTimeout(ComicsParameters.TIME_OUT);
                resCode = urlConnection.getResponseCode();
            } catch (EOFException e) {
                // under Android 4
                resCode = -1;
            } catch (IOException e) {
                e.printStackTrace();
            }

            Log.d("ComicsReader", "Rescode " + resCode);

            if (resCode < 0) {
                retry = true;
            } else if (resCode == 401) {
                ComicsAuthenticator.sInstance.setResult(false);

                // user pressed cancel
                if (!ComicsAuthenticator.sInstance.isValidated()) {
                    return null;
                }

                retry = true;
            } else {
                retry = false;
            }
        } while (retry);

        if (resCode != HttpURLConnection.HTTP_OK) {
            ComicsAuthenticator.sInstance.setResult(false);

            // TODO: HTTP error occurred 
            return null;
        }

        final ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        InputStream is = null;

        try {
            // download the file
            is = new BufferedInputStream(urlConnection.getInputStream(), ComicsParameters.BUFFER_SIZE);

            int count = 0;
            byte data[] = new byte[ComicsParameters.BUFFER_SIZE];

            while ((count = is.read(data)) != -1) {
                bytes.write(data, 0, count);
            }

            ComicsAuthenticator.sInstance.setResult(true);
        } catch (IOException e) {
            error = e.toString();
            e.printStackTrace();
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (urlConnection != null) {
                urlConnection.disconnect();
            }
        }

        if (bytes != null) {
            final String text = new String(bytes.toByteArray());

            if (text.contains("<albums>")) {
                parseXml(text);
            } else if (text.contains("\"albums\":")) {
                parseJson(text);
            } else {
                Log.e("ComicsReader", "Error");
            }
        }

        return error;
    }

    @Override
    protected void onProgressUpdate(Integer... progress) {
    }

    @Override
    protected void onPostExecute(String error) {
        mActivity.get().dismissDialog(CommonActivity.DIALOG_WAIT);

        if (error != null) {
            mActivity.get().displayError(error);
            mActivity.get().setLastUrl(null);
        } else {
            if (mItems != null) {
                mActivity.get().displayItems(mUrl, mItems);
            }
        }
    }
}