/*
* Copyright 2013-2014 Erudika. http://erudika.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.
*
* For issues and patches go to: https://github.com/erudika
*/
package com.erudika.para.security;
import com.eaio.uuid.UUID;
import com.erudika.para.core.User;
import com.erudika.para.utils.Config;
import com.erudika.para.utils.Utils;
import com.fasterxml.jackson.databind.ObjectReader;
import java.io.IOException;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHeaders;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.springframework.security.authentication.AuthenticationServiceException;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.LockedException;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter;
/**
* A filter that handles authentication requests to Facebook.
* @author Alex Bogdanovski [alex@erudika.com]
*/
public class FacebookAuthFilter extends AbstractAuthenticationProcessingFilter {
private static final String PROFILE_URL = "https://graph.facebook.com/me?"
+ "fields=name,email,picture.width(400).type(square).height(400)&access_token=";
private static final String TOKEN_URL = "https://graph.facebook.com/oauth/access_token?"
+ "code={0}&redirect_uri={1}&client_id={2}&client_secret={3}";
/**
* The default filter mapping
*/
public static final String FACEBOOK_ACTION = "facebook_auth";
/**
* Default constructor.
* @param defaultFilterProcessesUrl the url of the filter
*/
public FacebookAuthFilter(String defaultFilterProcessesUrl) {
super(defaultFilterProcessesUrl);
}
/**
* Handles an authentication request.
* @param request HTTP request
* @param response HTTP response
* @return an authentication object that contains the principal object if successful.
* @throws IOException ex
*/
@Override
@SuppressWarnings("unchecked")
public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response)
throws IOException {
final String requestURI = request.getRequestURI();
Authentication userAuth = null;
User user = new User();
if (requestURI.endsWith(FACEBOOK_ACTION)) {
String authCode = request.getParameter("code");
if (!StringUtils.isBlank(authCode)) {
String url = Utils.formatMessage(TOKEN_URL, authCode,
request.getRequestURL().toString(), Config.FB_APP_ID, Config.FB_SECRET);
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet tokenPost = new HttpGet(url);
CloseableHttpResponse resp1 = httpclient.execute(tokenPost);
ObjectReader jreader = Utils.getJsonReader(Map.class);
if (resp1 != null && resp1.getEntity() != null) {
String token = EntityUtils.toString(resp1.getEntity(), Config.DEFAULT_ENCODING);
if (token != null && token.startsWith("access_token")) {
// got valid token
String accessToken = token.substring(token.indexOf("=") + 1, token.indexOf("&"));
HttpGet profileGet = new HttpGet(PROFILE_URL + accessToken);
CloseableHttpResponse resp2 = httpclient.execute(profileGet);
HttpEntity respEntity = resp2.getEntity();
String ctype = resp2.getFirstHeader(HttpHeaders.CONTENT_TYPE).getValue();
if (respEntity != null && Utils.isJsonType(ctype)) {
Map<String, Object> profile = jreader.readValue(resp2.getEntity().getContent());
if (profile != null && profile.containsKey("id")) {
String fbId = (String) profile.get("id");
Map<String, Object> pic = (Map<String, Object>) profile.get("picture");
String email = (String) profile.get("email");
String name = (String) profile.get("name");
user.setIdentifier(Config.FB_PREFIX.concat(fbId));
user = User.readUserForIdentifier(user);
if (user == null) {
//user is new
user = new User();
user.setEmail(StringUtils.isBlank(email) ? "email@domain.com" : email);
user.setName(StringUtils.isBlank(name) ? "No Name" : name);
user.setPassword(new UUID().toString());
user.setIdentifier(Config.FB_PREFIX.concat(fbId));
if (user.getPicture() == null && pic != null) {
Map<String, Object> data = (Map<String, Object>) pic.get("data");
// try to get the direct url to the profile pic
if (data != null && data.containsKey("url")) {
user.setPicture((String) data.get("url"));
} else {
user.setPicture("http://graph.facebook.com/" + fbId +
"/picture?width=400&height=400&type=square");
}
}
String id = user.create();
if (id == null) {
throw new AuthenticationServiceException("Authentication failed: cannot create new user.");
}
}
userAuth = new UserAuthentication(user);
}
EntityUtils.consumeQuietly(resp2.getEntity());
}
EntityUtils.consumeQuietly(resp1.getEntity());
}
}
}
}
if (userAuth == null || user == null || user.getIdentifier() == null) {
throw new BadCredentialsException("Bad credentials.");
} else if (!user.isEnabled()) {
throw new LockedException("Account is locked.");
}
return userAuth;
}
}