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/*
 * Copyright 2013 gitblit.com.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.gitblit;

import java.io.IOException;
import java.text.MessageFormat;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.gitblit.manager.IRepositoryManager;
import com.gitblit.manager.IRuntimeManager;
import com.gitblit.manager.ISessionManager;
import com.gitblit.manager.IUserManager;
import com.gitblit.models.RepositoryModel;
import com.gitblit.models.UserModel;
import com.gitblit.utils.StringUtils;

/**
 * Handles requests for Sparkleshare Invites
 *
 * @author James Moger
 *
 */
public class SparkleShareInviteServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public SparkleShareInviteServlet() {
		super();
	}

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, java.io.IOException {
		processRequest(request, response);
	}

	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		processRequest(request, response);
	}

	protected void processRequest(javax.servlet.http.HttpServletRequest request,
			javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException,
			java.io.IOException {

		IStoredSettings settings = GitBlit.getManager(IRuntimeManager.class).getSettings();
		IUserManager userManager = GitBlit.getManager(IUserManager.class);
		ISessionManager sessionManager = GitBlit.getManager(ISessionManager.class);
		IRepositoryManager repositoryManager = GitBlit.getManager(IRepositoryManager.class);

		// extract repo name from request
		String repoUrl = request.getPathInfo().substring(1);

		// trim trailing .xml
		if (repoUrl.endsWith(".xml")) {
			repoUrl = repoUrl.substring(0, repoUrl.length() - 4);
		}

		String servletPath =  Constants.GIT_PATH;

		int schemeIndex = repoUrl.indexOf("://") + 3;
		String host = repoUrl.substring(0, repoUrl.indexOf('/', schemeIndex));
		String path = repoUrl.substring(repoUrl.indexOf(servletPath) + servletPath.length());
		String username = null;
		int fetchIndex = repoUrl.indexOf('@');
		if (fetchIndex > -1) {
			username = repoUrl.substring(schemeIndex, fetchIndex);
		}
		UserModel user;
		if (StringUtils.isEmpty(username)) {
			user = sessionManager.authenticate(request);
		} else {
			user = userManager.getUserModel(username);
		}
		if (user == null) {
			user = UserModel.ANONYMOUS;
			username = "";
		}

		// ensure that the requested repository exists
		RepositoryModel model = repositoryManager.getRepositoryModel(path);
		if (model == null) {
			response.setStatus(HttpServletResponse.SC_NOT_FOUND);
			response.getWriter().append(MessageFormat.format("Repository \"{0}\" not found!", path));
			return;
		}

		StringBuilder sb = new StringBuilder();
		sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
		sb.append("<sparkleshare><invite>\n");
		sb.append(MessageFormat.format("<address>{0}</address>\n", host));
		sb.append(MessageFormat.format("<remote_path>{0}{1}</remote_path>\n", servletPath, model.name));
		if (settings.getInteger(Keys.fanout.port, 0) > 0) {
			// Gitblit is running it's own fanout service for pubsub notifications
			sb.append(MessageFormat.format("<announcements_url>tcp://{0}:{1}</announcements_url>\n", request.getServerName(), settings.getString(Keys.fanout.port, "")));
		}
		sb.append("</invite></sparkleshare>\n");

		// write invite to client
		response.setContentType("application/xml");
		response.setContentLength(sb.length());
		response.getWriter().append(sb.toString());
	}
}