CustomAuthenticationEntryPoint.java

/*
 * Copyright 2006-2011 the original author or authors.
 *
 * 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.mobileagility.core.security;

import org.springframework.security.oauth2.provider.error.*;

import java.io.IOException;

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

import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.oauth2.common.OAuth2AccessToken;
import org.springframework.security.oauth2.common.exceptions.OAuth2Exception;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.util.StringUtils;

import org.apache.log4j.Logger;

/**
 * If authentication fails and the caller has asked for a specific content type response, this entry point can send one,
 * along with a standard 401 status. Add to the Spring Security configuration as an {@link AuthenticationEntryPoint} in
 * the usual way.
 *
 * @author Dave Syer
 * @hacked_up_by SlimeQ
 *
 */
public class CustomAuthenticationEntryPoint extends AbstractOAuth2SecurityExceptionHandler implements
		AuthenticationEntryPoint {

  private static Logger log = Logger.getLogger(CustomAuthenticationEntryPoint.class);

	private String typeName = OAuth2AccessToken.BEARER_TYPE;

	private String realmName = "oauth";

	public void setRealmName(String realmName) {
		this.realmName = realmName;
	}

	public void setTypeName(String typeName) {
		this.typeName = typeName;
	}

  public static String getFullURL(HttpServletRequest request) {
    StringBuffer requestURL = request.getRequestURL();
    String queryString = request.getQueryString();

    if (queryString == null) {
        return requestURL.toString();
    } else {
        return requestURL.append('?').append(queryString).toString();
    }
}

	public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException)
			throws IOException, ServletException {
    String uri = getFullURL(request);
    log.info("redirect:"+uri);
    if (!uri.contains("?ruri="))
      response.sendRedirect("/login?ruri="+uri);
		// doHandle(request, response, authException);
	}

	@Override
	protected ResponseEntity<OAuth2Exception> enhanceResponse(ResponseEntity<OAuth2Exception> response, Exception exception) {
		HttpHeaders headers = response.getHeaders();
		String existing = null;
		if (headers.containsKey("WWW-Authenticate")) {
			existing = extractTypePrefix(headers.getFirst("WWW-Authenticate"));
		}
		StringBuilder builder = new StringBuilder();
		builder.append(typeName+" ");
		builder.append("realm=\"" + realmName + "\"");
		if (existing!=null) {
			builder.append(", "+existing);
		}
		HttpHeaders update = new HttpHeaders();
		update.putAll(response.getHeaders());
		update.set("WWW-Authenticate", builder.toString());

    log.debug("ENHANCING RESPONSE!!!");
    log.debug(response.getBody());
    // System.out.println("redirecting to login?!");
    // response.sendRedirect("/login");

		return new ResponseEntity<OAuth2Exception>(response.getBody(), update, response.getStatusCode());
	}

	private String extractTypePrefix(String header) {
		String existing = header;
		String[] tokens = existing.split(" +");
		if (tokens.length > 1 && !tokens[0].endsWith(",")) {
			existing = StringUtils.arrayToDelimitedString(tokens, " ").substring(existing.indexOf(" ") + 1);
		}
		return existing;
	}

}

OAuthConfiguration.java

@Configuration
@EnableResourceServer
public class OAuthConfiguration extends ResourceServerConfigurerAdapter {
  
  ...

  @Override
  public void configure(ResourceServerSecurityConfigurer resources) throws Exception {
      TokenStore tokenStore = new JdbcTokenStore(oauthDataSource());
      SessionTokenExtractor tokenExtractor = new SessionTokenExtractor();
      resources.resourceId("resource-services")
              .tokenStore(tokenStore)
              .tokenExtractor(tokenExtractor)
              .authenticationEntryPoint(new CustomAuthenticationEntryPoint());
  }
  
  ...

}