// Copyright (C) 2008 The Android Open Source Project
//
// 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.gerrit.server;

import com.google.gwtjsonrpc.server.XsrfException;
import com.google.gwtorm.client.OrmException;

import org.openid4java.consumer.ConsumerException;

import java.io.IOException;

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

/** Handles the <code>/login</code> URL for web based single-sign-on. */
@SuppressWarnings("serial")
public class OpenIdLoginServlet extends HttpServlet {
  private OpenIdServiceImpl impl;

  @Override
  public void init(final ServletConfig config) throws ServletException {
    super.init(config);

    try {
      impl = OpenIdServiceImpl.getInstance();
    } catch (OrmException e) {
      throw new ServletException("Cannot load GerritServer", e);
    } catch (XsrfException e) {
      throw new ServletException("Cannot load GerritServer", e);
    } catch (ConsumerException e) {
      throw new ServletException("Cannot load OpenId consumer", e);
    }
  }

  @Override
  public void doGet(final HttpServletRequest req, final HttpServletResponse rsp)
      throws IOException {
    doPost(req, rsp);
  }

  @Override
  public void doPost(final HttpServletRequest req, final HttpServletResponse rsp)
      throws IOException {
    try {
      impl.doAuth(req, rsp);
    } catch (Exception e) {
      getServletContext().log("Unexpected error during authentication", e);
      rsp.reset();
      rsp.sendError(500);
    }
  }
}