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.Danishbits; import android.content.Context; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.client.HttpClient; 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.message.BasicNameValuePair; 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 java.io.InputStream; import java.net.URLEncoder; import java.security.InvalidParameterException; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Arrays; import java.util.Date; import java.util.List; import java.util.Locale; import javax.security.auth.login.LoginException; /** * An adapter that provides access to Danishbits searches by parsing the raw HTML output. */ public class DanishbitsAdapter implements ISearchAdapter { private static final String LOGINURL = "https://danishbits.org/login.php"; private static final String QUERYURL = "https://danishbits.org/torrents.php?action=newbrowse&search=%1$s&type=%2$s"; private static final String SORT_COMPOSITE = ""; private static final String SORT_SEEDS = "&sort_Seeders=DESC"; private HttpClient prepareRequest(Context context) throws Exception { String username = SettingsHelper.getSiteUser(context, TorrentSite.Danishbits); String password = SettingsHelper.getSitePass(context, TorrentSite.Danishbits); if (username == null || password == null) { throw new InvalidParameterException( "No username or password was provided, while this is required for this private site."); } // Setup http client HttpClient httpclient = HttpHelper.buildDefaultSearchHttpClient(false); // First log in HttpPost loginPost = new HttpPost(LOGINURL); loginPost.setEntity(new UrlEncodedFormEntity(Arrays.asList(new BasicNameValuePair("username", username), new BasicNameValuePair("password", password), new BasicNameValuePair("Login", "login")))); HttpResponse loginResult = httpclient.execute(loginPost); String loginHtml = HttpHelper.convertStreamToString(loginResult.getEntity().getContent()); final String LOGIN_ERROR = "<form id=\"loginform\" method=\"post\" action=\"login.php\">"; if (loginResult.getStatusLine().getStatusCode() != HttpStatus.SC_OK || loginHtml.indexOf(LOGIN_ERROR) >= 0) { // Failed to sign in throw new LoginException("Login failure for HoundDawgs with user " + username); } return httpclient; } @Override public List<SearchResult> search(Context context, String query, SortOrder order, int maxResults) throws Exception { HttpClient httpclient = prepareRequest(context); // Build a search request parameters final String url = String.format(QUERYURL, URLEncoder.encode(query, "UTF-8"), (order == SortOrder.BySeeders ? SORT_SEEDS : SORT_COMPOSITE)); // Start synchronous search 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 HttpClient httpclient = prepareRequest(context); HttpResponse response = httpclient.execute(new HttpGet(url)); return response.getEntity().getContent(); } protected List<SearchResult> parseHtml(String html, int maxResults) throws Exception { // Texts to find subsequently final String NOTORRENTS = "</a></td></tr></table>"; final String RESULTS = "<table class=\"torrent_table"; final String TORRENT = "<tr class=\"torrent"; // Parse the search results from HTML by looking for the identifying texts List<SearchResult> results = new ArrayList<>(); if (html.contains(NOTORRENTS)) { return results; // Success, but no results for this query } int resultsStart = html.indexOf(RESULTS) + RESULTS.length(); 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; } private SearchResult parseHtmlItem(String htmlItem) { // Texts to find subsequently final String LINK = "Direkte download link\" href=\""; final String LINK_END = "\">"; final String DETAILS1 = "<a href=\"?id"; final String DETAILS2 = "<a href=\""; final String DETAILS_END = "\" "; final String NAME = "title=\""; final String NAME_END = "\">"; final String SIZE = "</div><td>"; final String SIZE_END = "<br />"; final String DATE = "class=\"time\" title=\""; final String DATE_END = "\">"; final String SKIP = "</td><td>"; final String SEEDERS = "</td><td>"; final String SEEDERS_END = "</td>"; final String LEECHERS = "<td>"; final String LEECHERS_END = "</td>"; final DateFormat parseDateFormat = new SimpleDateFormat("MMM dd yyyy, HH:mm", Locale.US); int linkStart = htmlItem.indexOf(LINK) + LINK.length(); String link = htmlItem.substring(linkStart, htmlItem.indexOf(LINK_END, linkStart)); link = "https://danishbits.org/" + link; int detailsStart = htmlItem.indexOf(DETAILS1, linkStart) + DETAILS2.length(); String details = htmlItem.substring(detailsStart, htmlItem.indexOf(DETAILS_END, detailsStart)); details = "https://danishbits.org/torrents.php" + details; int nameStart = htmlItem.indexOf(NAME, detailsStart) + NAME.length(); String name = htmlItem.substring(nameStart, htmlItem.indexOf(NAME_END, nameStart)); int sizeStart = htmlItem.indexOf(SIZE, nameStart) + SIZE.length(); String size = htmlItem.substring(sizeStart, htmlItem.indexOf(SIZE_END, sizeStart)); int dateStart = htmlItem.indexOf(DATE, sizeStart) + DATE.length(); String dateString = htmlItem.substring(dateStart, htmlItem.indexOf(DATE_END, dateStart)); Date date = null; try { date = parseDateFormat.parse(dateString); } catch (Exception e) { // Ignore; just leave date null } int skip = htmlItem.indexOf(SKIP, dateStart) + SKIP.length(); int seedersStart = htmlItem.indexOf(SEEDERS, skip) + 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, date, seeders, leechers); } @Override public String buildRssFeedUrlFromSearch(String query, SortOrder order) { // Danishbits doesn't support RSS feed-based searches return null; } @Override public String getSiteName() { return "Danishbits"; } @Override public boolean isPrivateSite() { return true; } @Override public boolean usesToken() { return false; } }