juplo.de Git - facebook-utils/blob - src/main/java/de/juplo/facebook/FacebookUtils.java

   1 package de.juplo.facebook;
   2
   3
   4 import java.util.Arrays;
   5 import java.util.LinkedList;
   6 import java.util.List;
   7 import javax.annotation.PostConstruct;
   8 import org.slf4j.Logger;
   9 import org.slf4j.LoggerFactory;
  10 import org.springframework.beans.BeansException;
  11 import org.springframework.beans.factory.annotation.Autowired;
  12 import org.springframework.beans.factory.config.BeanPostProcessor;
  13 import org.springframework.context.annotation.Bean;
  14 import org.springframework.context.annotation.Configuration;
  15 import org.springframework.security.oauth2.client.OAuth2RestTemplate;
  16 import org.springframework.security.oauth2.client.http.OAuth2ErrorHandler;
  17 import org.springframework.security.oauth2.client.token.AccessTokenProvider;
  18 import org.springframework.security.oauth2.client.token.AccessTokenProviderChain;
  19 import org.springframework.security.oauth2.client.token.grant.client.ClientCredentialsAccessTokenProvider;
  20 import org.springframework.security.oauth2.client.token.grant.implicit.ImplicitAccessTokenProvider;
  21 import org.springframework.security.oauth2.client.token.grant.password.ResourceOwnerPasswordAccessTokenProvider;
  22
  23
  24
  25 /**
  26  * This class injects the facebook-utils into the spring-oauth2-configuration
  27  *
  28  * @author kai
  29  */
  30 @Configuration
  31 public class FacebookUtils
  32 {
  33   private final Logger log = LoggerFactory.getLogger(FacebookUtils.class);
  34
  35
  36   @Autowired(required=false)
  37   private List<AccessTokenProvider> accessTokenProviderChain;
  38
  39
  40   @PostConstruct
  41   public void init()
  42   {
  43     if (accessTokenProviderChain == null)
  44     {
  45       log.info("no AccessTokenProviderChain configured, creating default-chain");
  46       accessTokenProviderChain =
  47           Arrays.<AccessTokenProvider> asList(
  48               new ImplicitAccessTokenProvider(),
  49               new ResourceOwnerPasswordAccessTokenProvider(),
  50               new ClientCredentialsAccessTokenProvider()
  51               );
  52     }
  53   }
  54
  55
  56   @Bean
  57   public BeanPostProcessor getBeanPostProcessor(final String clientSecret)
  58   {
  59     log.debug("createing new instance of BeanPostProcessor");
  60     return new BeanPostProcessor() {
  61
  62       @Override
  63       public Object postProcessBeforeInitialization(
  64           Object bean,
  65           String beanName
  66           )
  67           throws
  68             BeansException
  69       {
  70         if (bean instanceof OAuth2RestTemplate)
  71         {
  72           log.info("injecting signed_request-aware AccessTokenProviderChain");
  73           OAuth2RestTemplate template = (OAuth2RestTemplate)bean;
  74           List<AccessTokenProvider> chain =
  75               new LinkedList<>(accessTokenProviderChain);
  76           SignedRequestAwareAuthorizationCodeAccessTokenProvider provider =
  77               new SignedRequestAwareAuthorizationCodeAccessTokenProvider();
  78           provider.setSecret(clientSecret);
  79           chain.add(provider);
  80           template.setAccessTokenProvider(new AccessTokenProviderChain(chain));
  81           log.info("injecting GraphApiErrorHandler");
  82           template.setErrorHandler(
  83               new GraphApiErrorHandler(
  84                   (OAuth2ErrorHandler)template.getErrorHandler()
  85                   )
  86               );
  87         }
  88
  89         return bean;
  90       }
  91
  92       @Override
  93       public Object postProcessAfterInitialization(
  94           Object bean,
  95           String beanName
  96           )
  97           throws
  98             BeansException
  99       {
 100         return bean;
 101       }
 102     };
 103   }
 104 }