Java tutorial
/* This file is part of Subsonic. Subsonic 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. Subsonic 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 Subsonic. If not, see <http://www.gnu.org/licenses/>. Copyright 2009 (C) Sindre Mehus */ package org.madsonic.ajax; import org.madsonic.Logger; import org.madsonic.domain.AvatarScheme; import org.madsonic.domain.MediaFile; import org.madsonic.domain.Player; import org.madsonic.domain.TransferStatus; import org.madsonic.domain.UserSettings; import org.madsonic.service.MediaFileService; import org.madsonic.service.MediaScannerService; import org.madsonic.service.PlayerService; import org.madsonic.service.SettingsService; import org.madsonic.service.StatusService; import org.madsonic.service.metadata.MetaData; import org.madsonic.service.metadata.MetaDataParser; import org.madsonic.service.metadata.MetaDataParserFactory; import org.madsonic.util.StringUtil; import org.apache.commons.lang.StringUtils; import org.directwebremoting.WebContext; import org.directwebremoting.WebContextFactory; import javax.servlet.http.HttpServletRequest; import java.io.File; import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * Provides AJAX-enabled services for retrieving the currently playing file and directory. * This class is used by the DWR framework (http://getahead.ltd.uk/dwr/). * * @author Sindre Mehus */ public class NowPlayingService { private static final Logger LOG = Logger.getLogger(NowPlayingService.class); private PlayerService playerService; private StatusService statusService; private SettingsService settingsService; private MediaScannerService mediaScannerService; private MediaFileService mediaFileService; private MetaDataParserFactory metaDataParserFactory; /** * Returns details about what the current player is playing. * * @return Details about what the current player is playing, or <code>null</code> if not playing anything. */ public NowPlayingInfo getNowPlayingForCurrentPlayer() throws Exception { WebContext webContext = WebContextFactory.get(); Player player = playerService.getPlayer(webContext.getHttpServletRequest(), webContext.getHttpServletResponse()); List<TransferStatus> statuses = statusService.getStreamStatusesForPlayer(player); List<NowPlayingInfo> result = convert(statuses); return result.isEmpty() ? null : result.get(0); } /** * Returns details about what all users are currently playing. * * @return Details about what all users are currently playing. */ public List<NowPlayingInfo> getNowPlaying() throws Exception { try { return convert(statusService.getAllStreamStatuses()); } catch (Throwable x) { LOG.error("Unexpected error in getNowPlaying: " + x, x); return Collections.emptyList(); } } /** * Returns media folder scanning status. */ public ScanInfo getScanningStatus() { return new ScanInfo(mediaScannerService.isScanning(), mediaScannerService.getScanCount()); } private List<NowPlayingInfo> convert(List<TransferStatus> statuses) throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); String url = request.getRequestURL().toString(); List<NowPlayingInfo> result = new ArrayList<NowPlayingInfo>(); for (TransferStatus status : statuses) { Player player = status.getPlayer(); File file = status.getFile(); if (player != null && player.getUsername() != null && file != null) { String username = player.getUsername(); UserSettings userSettings = settingsService.getUserSettings(username); if (!userSettings.isNowPlayingAllowed()) { continue; } MediaFile mediaFile = mediaFileService.getMediaFile(file); File coverArt = mediaFileService.getCoverArt(mediaFile); String artist = mediaFile.getArtist(); String title = mediaFile.getTitle(); String streamUrl = url.replaceFirst("/dwr/.*", "/stream?player=" + player.getId() + "&id=" + mediaFile.getId()); String albumUrl = url.replaceFirst("/dwr/.*", "/main.view?id=" + mediaFile.getId()); MetaDataParser parser = metaDataParserFactory.getParser(mediaFile.getFile()); MetaData metaData = parser.getMetaData(mediaFile.getFile()); String lyricsUrl; if (metaData.hasLyrics()) { lyricsUrl = "lyrics.view?id=" + mediaFile.getId(); } else { lyricsUrl = url.replaceFirst("/dwr/.*", "/lyrics.view?artistUtf8Hex=" + StringUtil.utf8HexEncode(artist) + "&songUtf8Hex=" + StringUtil.utf8HexEncode(title)); } // String coverArtUrl = coverArt == null ? null : url.replaceFirst("/dwr/.*", "/coverArt.view?size=48&id=" + mediaFile.getId()); // String coverArtZoomUrl = coverArt == null ? null : url.replaceFirst("/dwr/.*", "/coverArt.view?id=" + mediaFile.getId()); String coverArtUrl = url.replaceFirst("/dwr/.*", "/coverArt.view?size=48&id=" + mediaFile.getId()); String coverArtZoomUrl = url.replaceFirst("/dwr/.*", "/coverArt.view?id=" + mediaFile.getId()); String avatarUrl = null; if (userSettings.getAvatarScheme() == AvatarScheme.SYSTEM) { avatarUrl = url.replaceFirst("/dwr/.*", "/avatar.view?id=" + userSettings.getSystemAvatarId()); } else if (userSettings.getAvatarScheme() == AvatarScheme.CUSTOM && settingsService.getCustomAvatar(username) != null) { avatarUrl = url.replaceFirst("/dwr/.*", "/avatar.view?username=" + username); } // Rewrite URLs in case we're behind a proxy. if (settingsService.isRewriteUrlEnabled()) { String referer = request.getHeader("referer"); streamUrl = StringUtil.rewriteUrl(streamUrl, referer); albumUrl = StringUtil.rewriteUrl(albumUrl, referer); lyricsUrl = StringUtil.rewriteUrl(lyricsUrl, referer); coverArtUrl = StringUtil.rewriteUrl(coverArtUrl, referer); coverArtZoomUrl = StringUtil.rewriteUrl(coverArtZoomUrl, referer); avatarUrl = StringUtil.rewriteUrl(avatarUrl, referer); } String tooltip = StringUtil.toHtml(artist) + " – " + StringUtil.toHtml(title); if (StringUtils.isNotBlank(player.getName())) { username += "@" + player.getName(); } artist = StringUtil.toHtml(StringUtils.abbreviate(artist, 25)); title = StringUtil.toHtml(StringUtils.abbreviate(title, 25)); username = StringUtil.toHtml(StringUtils.abbreviate(username, 25)); long minutesAgo = status.getMillisSinceLastUpdate() / 1000L / 60L; if (minutesAgo < 60) { result.add(new NowPlayingInfo(username, artist, title, tooltip, streamUrl, albumUrl, lyricsUrl, coverArtUrl, coverArtZoomUrl, avatarUrl, (int) minutesAgo)); } } } return result; } public void setPlayerService(PlayerService playerService) { this.playerService = playerService; } public void setStatusService(StatusService statusService) { this.statusService = statusService; } public void setSettingsService(SettingsService settingsService) { this.settingsService = settingsService; } public void setMediaScannerService(MediaScannerService mediaScannerService) { this.mediaScannerService = mediaScannerService; } public void setMediaFileService(MediaFileService mediaFileService) { this.mediaFileService = mediaFileService; } public void setMetaDataParserFactory(MetaDataParserFactory metaDataParserFactory) { this.metaDataParserFactory = metaDataParserFactory; } }