Java tutorial
/* * The MIT License * * Copyright (c) 2014 Ericsson * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package com.sonyericsson.hudson.plugins.gerrit.trigger.utils; import com.sonyericsson.hudson.plugins.gerrit.trigger.Messages; import com.sonyericsson.hudson.plugins.gerrit.trigger.config.IGerritHudsonTriggerConfig; import org.apache.http.HttpResponse; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException; import java.net.HttpURLConnection; /** * Helper to determine if a Gerrit Plugin is installed * on the Gerrit server. * @author scott.hebert@ericsson.com */ public final class GerritPluginChecker { /** * Gerrit Plugin Checker. */ private GerritPluginChecker() { } private static final Logger logger = LoggerFactory.getLogger(GerritPluginChecker.class); /** * Build URL using Gerrit Server config. * @param config Gerrit Server config. * @return URL */ private static String buildURL(IGerritHudsonTriggerConfig config) { if (config == null) { throw new IllegalArgumentException("Gerrit Server Configuration cannot be null"); } if (!config.isUseRestApi()) { logger.warn("REST API is not enabled."); return null; } String gerritFrontEndUrl = config.getGerritFrontEndUrl(); String restUrl = gerritFrontEndUrl; if (gerritFrontEndUrl != null && !gerritFrontEndUrl.endsWith("/")) { restUrl = gerritFrontEndUrl + "/"; } return restUrl; } /** * Given a status code, decode its status. * @param statusCode HTTP code * @param pluginName plugin that was checked. * @return true/false if installed or not. */ private static boolean decodeStatus(int statusCode, String pluginName) { switch (statusCode) { case HttpURLConnection.HTTP_OK: logger.info(Messages.PluginInstalled(pluginName)); return true; case HttpURLConnection.HTTP_NOT_FOUND: logger.info(Messages.PluginNotInstalled(pluginName)); return false; case HttpURLConnection.HTTP_UNAUTHORIZED: logger.warn( Messages.PluginHttpConnectionUnauthorized(pluginName, Messages.HttpConnectionUnauthorized())); return false; case HttpURLConnection.HTTP_FORBIDDEN: logger.warn(Messages.PluginHttpConnectionForbidden(pluginName, Messages.HttpConnectionUnauthorized())); return false; default: logger.warn(Messages.PluginHttpConnectionGeneralError(pluginName, Messages.HttpConnectionError(statusCode))); return false; } } /** * Query Gerrit to determine if plugin is enabled. * @param config Gerrit Server Config * @param pluginName The Gerrit Plugin name. * @return true if enabled. */ public static boolean isPluginEnabled(IGerritHudsonTriggerConfig config, String pluginName) { String restUrl = buildURL(config); if (restUrl == null) { logger.warn(Messages.PluginInstalledRESTApiNull(pluginName)); return false; } logger.trace("{}plugins/{}/", restUrl, pluginName); HttpResponse execute = null; try { execute = HttpUtils.performHTTPGet(config, restUrl + "plugins/" + pluginName + "/"); } catch (IOException e) { logger.warn(Messages.PluginHttpConnectionGeneralError(pluginName, e.getMessage()), e); return false; } int statusCode = execute.getStatusLine().getStatusCode(); logger.debug("status code: {}", statusCode); return decodeStatus(statusCode, pluginName); } }