Import code from internal repository to git

java/com/google/domain/registry/ui/server/AbstractUiServlet.java

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// 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.google.domain.registry.ui.server;
+
+import static com.google.domain.registry.security.XsrfTokenManager.generateToken;
+
+import com.google.appengine.api.users.User;
+import com.google.appengine.api.users.UserService;
+import com.google.appengine.api.users.UserServiceFactory;
+import com.google.common.net.MediaType;
+import com.google.template.soy.data.SoyMapData;
+
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/** Abstract servlet for serving HTML pages. */
+public abstract class AbstractUiServlet extends HttpServlet {
+
+  protected String userId;
+  protected String userName;
+  protected String userActionName;
+  protected String userActionHref;
+  protected boolean userIsAdmin;
+
+  @Override
+  public void service(HttpServletRequest req, HttpServletResponse rsp)
+      throws ServletException, IOException {
+    UserService userService = UserServiceFactory.getUserService();
+    if (userService.isUserLoggedIn()) {
+      User u = userService.getCurrentUser();
+      userId = u.getUserId();
+      userName = u.getNickname();
+      userActionName = "Sign out";
+      userActionHref = userService.createLogoutURL(req.getRequestURI());
+      userIsAdmin = userService.isUserAdmin();
+    } else {
+      userId = null;
+      userName = null;
+      userActionName = "Sign in";
+      userActionHref = userService.createLoginURL(req.getRequestURI());
+      userIsAdmin = false;
+    }
+    super.service(req, rsp);
+  }
+
+  @Override
+  public void doGet(HttpServletRequest req, HttpServletResponse rsp)
+      throws ServletException, IOException {
+    rsp.addHeader("X-Frame-Options", "SAMEORIGIN");  // Disallow iframing.
+    rsp.setHeader("X-Ui-Compatible", "IE=edge");  // Ask IE not to be silly.
+    rsp.setContentType(MediaType.HTML_UTF_8.toString());
+    UserService userService = UserServiceFactory.getUserService();
+    if (!userService.isUserLoggedIn()) {
+      rsp.sendRedirect(userService.createLoginURL(req.getRequestURI()));
+      return;
+    }
+    rsp.getWriter().write(get(req));
+  }
+
+  /**
+   * Subclasses may override this method to access request params, or
+   * get() to simply return content.
+   */
+  protected String get(@SuppressWarnings("unused") HttpServletRequest req) {
+    return get();
+  }
+
+  /** Override this to just return content. */
+  protected String get() {
+    throw new UnsupportedOperationException();
+  }
+
+  /**
+   * Returns a map with {@code (user: (id,name,actionName,actionHref), gaeUserId:, xsrfToken:)}
+   */
+  protected SoyMapData getTemplateArgs(String xsrfToken) {
+    SoyMapData user = new SoyMapData();
+    user.put("id", userId);
+    user.put("name", userName);
+    user.put("actionName", userActionName);
+    user.put("actionHref", userActionHref);
+    user.put("isAdmin", userIsAdmin);
+    SoyMapData result = new SoyMapData();
+    result.put("user", user);
+    result.put("gaeUserId", userId);
+    result.put("xsrfToken", generateToken(xsrfToken));
+    return result;
+  }
+}