Java tutorial
/* * This file is part of Transdroid Torrent Search * <http://code.google.com/p/transdroid-search/> * * Transdroid Torrent Search is free software: you can redistribute * it and/or modify it under the terms of the GNU Lesser General * Public License as published by the Free Software Foundation, * either version 3 of the License, or (at your option) any later * version. * * Transdroid Torrent Search 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Transdroid. If not, see <http://www.gnu.org/licenses/>. */ package org.transdroid.search.BroadcasTheNet; import java.io.InputStream; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.security.InvalidParameterException; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import javax.security.auth.login.LoginException; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpConnectionParams; import org.apache.http.params.HttpParams; import org.transdroid.search.ISearchAdapter; import org.transdroid.search.SearchResult; import org.transdroid.search.SortOrder; import org.transdroid.search.TorrentSite; import org.transdroid.search.gui.SettingsHelper; import org.transdroid.util.HttpHelper; import android.content.Context; /** * An adapter that provides access to IPTorrents searches by parsing the raw HTML output. */ public class BroadcasTheNetAdapter implements ISearchAdapter { private static final String LOGIN_USER = "username"; private static final String LOGIN_PASS = "password"; private static final String LOGINURL = "http://www.broadcasthe.net/login.php"; private static final String QUERYURL = "http://www.broadcasthe.net/torrents.php?q=%1$s%2$s"; private static final String SORT_COMPOSITE = ""; private static final String SORT_SEEDS = ";o=seeders"; private static final int CONNECTION_TIMEOUT = 8000; private DefaultHttpClient prepareRequest(Context context) throws Exception { String username = SettingsHelper.getSiteUser(context, TorrentSite.BroadcasTheNet); String password = SettingsHelper.getSitePass(context, TorrentSite.BroadcasTheNet); if (username == null || password == null) { throw new InvalidParameterException( "No username or password was provided, while this is required for this private site."); } // Setup request using GET HttpParams httpparams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpparams, CONNECTION_TIMEOUT); HttpConnectionParams.setSoTimeout(httpparams, CONNECTION_TIMEOUT); DefaultHttpClient httpclient = new DefaultHttpClient(httpparams); // First log in HttpPost loginPost = new HttpPost(LOGINURL); loginPost.setEntity(new UrlEncodedFormEntity(Arrays.asList(new BasicNameValuePair[] { new BasicNameValuePair(LOGIN_USER, username), new BasicNameValuePair(LOGIN_PASS, password) }))); HttpResponse loginResult = httpclient.execute(loginPost); if (loginResult.getStatusLine().getStatusCode() != HttpStatus.SC_OK) { // Failed to sign in throw new LoginException("Login failure for BroadcasTheNet with user " + username); } return httpclient; } @Override public List<SearchResult> search(Context context, String query, SortOrder order, int maxResults) throws Exception { DefaultHttpClient httpclient = prepareRequest(context); // Build a search request parameters String encodedQuery = ""; try { encodedQuery = URLEncoder.encode(query, "UTF-8"); } catch (UnsupportedEncodingException e) { throw e; } final String url = String.format(QUERYURL, encodedQuery, (order == SortOrder.BySeeders ? SORT_SEEDS : SORT_COMPOSITE)); // Start synchronous search // Make request HttpGet httpget = new HttpGet(url); HttpResponse response = httpclient.execute(httpget); // Read HTML response InputStream instream = response.getEntity().getContent(); String html = HttpHelper.ConvertStreamToString(instream); instream.close(); return parseHtml(html, maxResults); } @Override public InputStream getTorrentFile(Context context, String url) throws Exception { // Provide an authenticated file handle to the requested url DefaultHttpClient httpclient = prepareRequest(context); HttpResponse response = httpclient.execute(new HttpGet(url)); return response.getEntity().getContent(); } protected List<SearchResult> parseHtml(String html, int maxResults) throws Exception { try { // Texts to find subsequently final String RESULTS = "<table class=torrents align=center border=1>"; final String NOTORRENTS = "No search results"; final String TORRENT = "<tr><td class=t_label>"; // Parse the search results from HTML by looking for the identifying texts List<SearchResult> results = new ArrayList<SearchResult>(); int resultsStart = html.indexOf(RESULTS) + RESULTS.length(); if (html.indexOf(NOTORRENTS) >= 0) return results; // Success, but no results for this query int torStart = html.indexOf(TORRENT, resultsStart); while (torStart >= 0 && results.size() < maxResults) { int nextTorrentIndex = html.indexOf(TORRENT, torStart + TORRENT.length()); if (nextTorrentIndex >= 0) { results.add(parseHtmlItem(html.substring(torStart + TORRENT.length(), nextTorrentIndex))); } else { results.add(parseHtmlItem(html.substring(torStart + TORRENT.length()))); } torStart = nextTorrentIndex; } return results; } catch (OutOfMemoryError e) { throw new Exception(e); } catch (Exception e) { throw new Exception(e); } } private SearchResult parseHtmlItem(String htmlItem) { // Texts to find subsequently final String DETAILS = "<a class=\"t_title\" href=\""; final String DETAILS_END = "\">"; final String NAME_END = "</a>"; final String LINK = "Bookmark it!\"></a></td><td class=ac><a href=\""; final String LINK_END = "\">"; final String COMMENTS = "#startcomments"; final String SIZE = "</a></td><td class=ac>"; final String SIZE_END = "</td>"; final String SEEDERS = "t_seeders\">"; final String SEEDERS_END = "</td>"; final String LEECHERS = "t_leechers\">"; final String LEECHERS_END = "</td>"; String prefix = "http://www.iptorrents.com"; int detailsStart = htmlItem.indexOf(DETAILS) + DETAILS.length(); String details = htmlItem.substring(detailsStart, htmlItem.indexOf(DETAILS_END, detailsStart)); details = prefix + details; // Name starts right after the link of an item int nameStart = htmlItem.indexOf(DETAILS_END, detailsStart) + DETAILS_END.length(); String name = htmlItem.substring(nameStart, htmlItem.indexOf(NAME_END, nameStart)); int linkStart = htmlItem.indexOf(LINK, nameStart) + LINK.length(); String link = htmlItem.substring(linkStart, htmlItem.indexOf(LINK_END, linkStart)); link = prefix + link; int commentsStart = htmlItem.indexOf(COMMENTS, linkStart) + COMMENTS.length(); int sizeStart = htmlItem.indexOf(SIZE, commentsStart) + SIZE.length(); String size = htmlItem.substring(sizeStart, htmlItem.indexOf(SIZE_END, sizeStart)); int seedersStart = htmlItem.indexOf(SEEDERS, sizeStart) + SEEDERS.length(); int seeders = 0; if (seedersStart >= 0) { try { String seedersText = htmlItem.substring(seedersStart, htmlItem.indexOf(SEEDERS_END, seedersStart)); seeders = Integer.parseInt(seedersText); } catch (Exception e) { // Number of seeders not found; ignore } } int leechersStart = htmlItem.indexOf(LEECHERS, seedersStart) + LEECHERS.length(); int leechers = 0; if (leechersStart >= 0) { try { String leechersText = htmlItem.substring(leechersStart, htmlItem.indexOf(LEECHERS_END, leechersStart)); leechers = Integer.parseInt(leechersText); } catch (Exception e) { // Number of seeders not found; ignore } } return new SearchResult(name, link, details, size, null, seeders, leechers); } @Override public String buildRssFeedUrlFromSearch(String query, SortOrder order) { // IPTorrents doesn't support RSS feed-based searches return null; } @Override public String getSiteName() { return "IPTorrents"; } @Override public boolean isPrivateSite() { return true; } }