| commit | author | age | ||
| 929228 | 1 | /* |
| U | 2 | Calypso - Media Player Remote Control via HTTP for Raspberry Pi |
| 3 | Copyright (C) 2021-2023 Ulrich Hilger | |
| 4 | ||
| 5 | This program is free software: you can redistribute it and/or modify | |
| 6 | it under the terms of the GNU Affero General Public License as | |
| 7 | published by the Free Software Foundation, either version 3 of the | |
| 8 | License, or (at your option) any later version. | |
| 9 | ||
| 10 | This program is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | GNU Affero General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Affero General Public License | |
| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. | |
| 17 | */ | |
| 18 | ||
| 19 | package de.uhilger.calypso.neu.http; | |
| 20 | ||
| 21 | import com.sun.net.httpserver.HttpContext; | |
| 22 | import com.sun.net.httpserver.HttpExchange; | |
| 23 | import de.uhilger.calypso.neu.actor.PlayActor; | |
| 24 | import de.uhilger.calypso.neu.actor.ShellActor; | |
| 25 | import de.uhilger.calypso.neu.actor.StopServerActor; | |
| 26 | import java.io.IOException; | |
| 27 | import java.util.Collection; | |
| 28 | import java.util.Map; | |
| 29 | import java.util.logging.Level; | |
| 30 | import java.util.logging.Logger; | |
| 31 | ||
| 32 | /** | |
| 33 | * Der ApiHandler ist die proprietaer fuer Calypso vorgesehene | |
| 34 | * Weise, HTTP-Anfragen zu verarbeiten. | |
| 35 | * | |
| 36 | * Der ApiHandler ist ein HttpHandler, der vom Server ueber die | |
| 37 | * gesamte Laufzeit des Programmes hinweg gehalten wird. Deswegen | |
| 38 | * beschraenkt sich der Programmcode des ApiHandlers auf die | |
| 39 | * Verteilung der Kommandos auf Aktoren. Die Aktoren werden je nach | |
| 40 | * Bedarf instanziiert und enthalten zusammengenommen den Code | |
| 41 | * des Anwendungskerns. | |
| 42 | * | |
| 43 | * @author Ulrich Hilger | |
| 44 | */ | |
| 45 | public class ApiHandler extends HttpApi { | |
| 46 | ||
| 47 | public static final int PLAYERCMD = 2; | |
| 48 | public static final int SERVERCMD = 3; | |
| 49 | public static final String PLAY = "play"; | |
| 50 | public static final String PAUSE = "pause"; | |
| 51 | public static final String SEEK = "seek"; | |
| 52 | public static final String STOP = "stop"; | |
| 53 | public static final String SERVER = "server"; | |
| 54 | public static final String PING = "ping"; | |
| 55 | ||
| 56 | public static final String PLAYER = "player-proc"; | |
| 57 | ||
| 58 | /** | |
| 59 | * Die HTTP-Anfrage ausführen | |
| 60 | * | |
| 61 | * WICHTIG: Die HTTP-Parameter aus dem Query-Teil muessen in | |
| 62 | * der Reihenfolge sein, die vom Shell-Skript erwartet wird. | |
| 63 | * | |
| 64 | * @param elems die Elemente des URI-Pfads | |
| 65 | * @param parameter die Parameter des Query-Teils der URI | |
| 66 | * @param exchange das Objekt mit Infos zum HTTP-Aufruf | |
| 67 | * @return die Antwort, die gesendet werden soll | |
| 68 | */ | |
| 69 | @Override | |
| 70 | protected String process(String[] elems, Map parameter, HttpExchange exchange) { | |
| 71 | String antwort; | |
| 72 | Object o; | |
| 73 | ||
| 74 | switch (elems[PLAYERCMD]) { | |
| 75 | case PLAY: | |
| 76 | PlayActor a = new PlayActor(); | |
| 77 | o = a.run(parameter); | |
| 78 | if (o instanceof Process) { | |
| 79 | exchange.getHttpContext().getAttributes().put(PLAYER, o); | |
| 80 | antwort = "Abspielprozess gestartet."; | |
| 81 | } else { | |
| 82 | // kein Prozess, es ist etwas schief gelaufen | |
| 83 | antwort = "Abspielen konnte nicht gestartet werden."; | |
| 84 | } | |
| 85 | break; | |
| 86 | ||
| 87 | case PAUSE: | |
| 88 | case SEEK: | |
| 89 | ShellActor pa = new ShellActor(); | |
| 90 | try { | |
| 91 | pa.run(getSkriptDir(exchange), elems[PLAYERCMD], toShellParams(parameter)); | |
| 92 | antwort = elems[PLAYERCMD] + " ausgefuehrt"; | |
| 93 | } catch (IOException ex) { | |
| 94 | Logger.getLogger(ApiHandler.class.getName()).log(Level.SEVERE, null, ex); | |
| 95 | antwort = "Fehler bei der Ausfuehrung von " + elems[PLAYERCMD]; | |
| 96 | } | |
| 97 | break; | |
| 98 | ||
| 99 | case STOP: | |
| 100 | o = exchange.getHttpContext().getAttributes().get(PLAYER); | |
| 101 | if(o instanceof Process) { | |
| 102 | Process p = (Process) o; | |
| 103 | p.destroy(); | |
| 104 | antwort = "Player gestoppt."; | |
| 105 | } else { | |
| 106 | antwort = "Es wurde kein Player-Prozess zum Stoppen gefunden."; | |
| 107 | } | |
| 108 | break; | |
| 109 | ||
| 110 | case SERVER: | |
| 111 | if(elems[SERVERCMD].equals(STOP)) { | |
| 112 | new StopServerActor().run(exchange.getHttpContext()); | |
| 113 | antwort = "Calypso: Der Server wird angehalten und die App beendet."; | |
| 114 | } else { | |
| 115 | antwort = elems[SERVERCMD] + " ist ein unbekanntes Serverkommando"; | |
| 116 | } | |
| 117 | break; | |
| 118 | ||
| 119 | case PING: | |
| 120 | antwort = elems[PLAYERCMD]; | |
| 121 | break; | |
| 122 | ||
| 123 | default: | |
| 124 | antwort = "Kommando " + elems[PLAYERCMD] + " unbekannt"; | |
| 125 | break; | |
| 126 | } | |
| 127 | ||
| 128 | return antwort; | |
| 129 | } | |
| 130 | ||
| 131 | private String[] toShellParams(Map parameter) { | |
| 132 | Collection<String> c = parameter.values(); | |
| 133 | return c.toArray(String[]::new); | |
| 134 | } | |
| 135 | ||
| 136 | private String getSkriptDir(HttpExchange exchange) { | |
| 137 | HttpContext context = exchange.getHttpContext(); | |
| 138 | Object o = context.getAttributes().get(Server.SKRIPT_DIR); | |
| 139 | if (o instanceof String) { | |
| 140 | return (String) o; | |
| 141 | } else { | |
| 142 | // kein Skript-Dir | |
| 143 | return ""; | |
| 144 | } | |
| 145 | } | |
| 146 | } | |
