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

   1 package de.juplo.facebook;
   2
   3
   4 import de.juplo.facebook.token.SignedRequestAwareAuthorizationCodeAccessTokenProvider;
   5 import de.juplo.facebook.exceptions.GraphApiErrorHandler;
   6 import java.util.Arrays;
   7 import java.util.LinkedList;
   8 import java.util.List;
   9 import javax.annotation.PostConstruct;
  10 import org.slf4j.Logger;
  11 import org.slf4j.LoggerFactory;
  12 import org.springframework.beans.BeansException;
  13 import org.springframework.beans.factory.annotation.Autowired;
  14 import org.springframework.beans.factory.config.BeanPostProcessor;
  15 import org.springframework.context.annotation.Bean;
  16 import org.springframework.context.annotation.Configuration;
  17 import org.springframework.security.oauth2.client.OAuth2RestTemplate;
  18 import org.springframework.security.oauth2.client.http.OAuth2ErrorHandler;
  19 import org.springframework.security.oauth2.client.token.AccessTokenProvider;
  20 import org.springframework.security.oauth2.client.token.AccessTokenProviderChain;
  21 import org.springframework.security.oauth2.client.token.grant.client.ClientCredentialsAccessTokenProvider;
  22 import org.springframework.security.oauth2.client.token.grant.implicit.ImplicitAccessTokenProvider;
  23 import org.springframework.security.oauth2.client.token.grant.password.ResourceOwnerPasswordAccessTokenProvider;
  24
  25
  26
  27 /**
  28  * This class injects the facebook-utils into the spring-oauth2-configuration
  29  *
  30  * @author kai
  31  */
  32 @Configuration
  33 public class FacebookUtils
  34 {
  35   private final Logger log = LoggerFactory.getLogger(FacebookUtils.class);
  36
  37
  38   @Autowired(required=false)
  39   private List<AccessTokenProvider> accessTokenProviderChain;
  40
  41
  42   @PostConstruct
  43   public void init()
  44   {
  45     if (accessTokenProviderChain == null)
  46     {
  47       log.info("no AccessTokenProviderChain configured, creating default-chain");
  48       accessTokenProviderChain =
  49           Arrays.<AccessTokenProvider> asList(
  50               new ImplicitAccessTokenProvider(),
  51               new ResourceOwnerPasswordAccessTokenProvider(),
  52               new ClientCredentialsAccessTokenProvider()
  53               );
  54     }
  55   }
  56
  57
  58   @Bean
  59   public BeanPostProcessor getBeanPostProcessor(final String clientSecret)
  60   {
  61     log.debug("createing new instance of BeanPostProcessor");
  62     return new BeanPostProcessor() {
  63
  64       @Override
  65       public Object postProcessBeforeInitialization(
  66           Object bean,
  67           String beanName
  68           )
  69           throws
  70             BeansException
  71       {
  72         if (bean instanceof OAuth2RestTemplate)
  73         {
  74           log.info("injecting signed_request-aware AccessTokenProviderChain");
  75           OAuth2RestTemplate template = (OAuth2RestTemplate)bean;
  76           List<AccessTokenProvider> chain =
  77               new LinkedList<>(accessTokenProviderChain);
  78           SignedRequestAwareAuthorizationCodeAccessTokenProvider provider =
  79               new SignedRequestAwareAuthorizationCodeAccessTokenProvider();
  80           provider.setSecret(clientSecret);
  81           chain.add(provider);
  82           template.setAccessTokenProvider(new AccessTokenProviderChain(chain));
  83           log.info("injecting GraphApiErrorHandler");
  84           template.setErrorHandler(
  85               new GraphApiErrorHandler(
  86                   (OAuth2ErrorHandler)template.getErrorHandler()
  87                   )
  88               );
  89         }
  90
  91         return bean;
  92       }
  93
  94       @Override
  95       public Object postProcessAfterInitialization(
  96           Object bean,
  97           String beanName
  98           )
  99           throws
 100             BeansException
 101       {
 102         return bean;
 103       }
 104     };
 105   }
 106 }