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/* |
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AV-Direktor - Control OMXPlayer on Raspberry Pi via HTTP |
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Copyright (C) 2021 Ulrich Hilger |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU Affero General Public License as |
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published by the Free Software Foundation, either version 3 of the |
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License, or (at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU Affero General Public License for more details. |
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You should have received a copy of the GNU Affero General Public License |
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along with this program. If not, see <https://www.gnu.org/licenses/>. |
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*/ |
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package de.uhilger.avdirektor.handler; |
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import com.sun.net.httpserver.HttpExchange; |
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import com.sun.net.httpserver.HttpHandler; |
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import java.io.IOException; |
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import java.io.OutputStream; |
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import java.util.HashMap; |
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import java.util.Map; |
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import java.util.Set; |
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import java.util.logging.Level; |
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import java.util.logging.Logger; |
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/** |
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* |
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* @author ulrich |
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*/ |
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public abstract class AbstractHandler implements HttpHandler { |
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private static final Logger logger = Logger.getLogger(AbstractHandler.class.getName()); |
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protected String cmd; |
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protected Map map; |
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@Override |
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public void handle(HttpExchange t) throws IOException { |
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logger.log(Level.FINE, "RequestURI: {0}", t.getRequestURI().toString()); |
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StringBuilder params = buildParams(t); |
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String antwort = process(t, params.toString()); |
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sendResponse(t, cmd, antwort); |
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} |
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protected abstract String process(HttpExchange t, String params); |
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protected StringBuilder buildParams(HttpExchange t) { |
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map = getQueryMap(t); |
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StringBuilder params = new StringBuilder(); |
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return params; |
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} |
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protected void sendResponse(HttpExchange t, String cmd, String antwort) throws IOException { |
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String response = getResponseString(map, cmd, antwort); |
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t.sendResponseHeaders(200, response.length()); |
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OutputStream os = t.getResponseBody(); |
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os.write(response.getBytes()); |
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os.close(); |
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} |
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public void setCmd(String cmd) { |
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this.cmd = cmd; |
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} |
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public String getCmd(String cmd) { |
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return this.cmd; |
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} |
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/* --- --- */ |
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protected String getParam(Map map, String key) { |
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Object o = map.get(key); |
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if(o != null) { |
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return o.toString(); |
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} else { |
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return null; |
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} |
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} |
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/* |
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Den Query-Teil einer URL in die Parameter zerlegen |
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Die Zerlegung erfolgt mit String.split nach |
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& und dann nach = |
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*/ |
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protected Map getQueryMap(HttpExchange t) { |
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HashMap map = new HashMap(); |
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String query = t.getRequestURI().getQuery(); |
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if(query != null && query.length() > 0) { |
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String qParts[] = query.split("&"); |
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for(String qPart : qParts) { |
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logger.finer("qPart: " + qPart); |
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String pParts[] = qPart.split("="); |
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map.put(pParts[0], pParts[1]); |
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logger.finer("pParts[0]: " + pParts[0] + ", pParts[1]: " + pParts[1]); |
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} |
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} |
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return map; |
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} |
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protected String getResponseString(Map map, String cmd, String antwort) { |
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Set keys = map.keySet(); |
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StringBuilder buf = new StringBuilder(); |
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buf.append(cmd); |
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buf.append(System.lineSeparator()); |
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keys.forEach((Object key) -> { |
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buf.append("key: "); |
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buf.append(key); |
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buf.append(System.lineSeparator()); |
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buf.append("value: "); |
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buf.append(map.get(key)); |
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buf.append(System.lineSeparator()); |
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//logger.log(Level.FINE, "key {0} value {1}", new Object[]{key, map.get(key)}); |
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}); |
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buf.append(antwort); |
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return buf.toString(); |
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} |
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} |