Android Open Source - kitty-compass Reauth Filter

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2013 Google Inc./*from  w ww .  java  2 s .  c o  m*/
 *
 * 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.glassware;

import com.google.api.client.auth.oauth2.TokenResponseException;

import java.io.IOException;
import java.util.logging.Logger;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * A filter which reacts to invalid grant_auth exceptions, typically caused when a user toggles a
 * Glassware 'off' on MyGlass. It redirects to the login flow when this happens.
 *
 * @author Jenny Murphy - http://google.com/+JennyMurphy
 */
public class ReauthFilter implements Filter {
  private static final Logger LOG = Logger.getLogger(ReauthFilter.class.getSimpleName());

  @Override
  public void doFilter(ServletRequest request, ServletResponse response,
      FilterChain filterChain) throws IOException, ServletException {

    // Skip this filter if somehow we have a request that's not HTTP
    if (response instanceof HttpServletResponse && request instanceof HttpServletRequest) {
      HttpServletRequest httpRequest = (HttpServletRequest) request;
      HttpServletResponse httpResponse = (HttpServletResponse) response;

      // Attempt to re-auth if we have an invalid grant exception.
      // This will only work if the request has not yet been committed.
      try {
        filterChain.doFilter(request, response);
      } catch (TokenResponseException e) {
        if (e.getDetails().getError().contains("invalid_grant")) {
          LOG.warning("User disabled Glassware. Attempting to re-authenticate");
          httpResponse.sendRedirect(WebUtil.buildUrl(httpRequest, "/oauth2callback"));
        }
      }
    }
  }

  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
  }

  @Override
  public void destroy() {
  }
}

Java Source Code List

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