package cn.home1.oss.lib.security.api;
   
   import static java.util.stream.Collectors.toSet;
   
   import com.google.common.collect.ImmutableMap;
   
   import cn.home1.oss.lib.common.Defaults;
   import cn.home1.oss.lib.security.internal.BaseGrantedAuthority;
   
  import org.springframework.security.core.Authentication;
  import org.springframework.security.core.GrantedAuthority;
  import org.springframework.security.oauth2.provider.OAuth2Authentication;
  import org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationDetails;
  
  import java.security.Principal;
  import java.util.Collection;
  import java.util.Map;
  import java.util.Set;
  
  /**
   * Created by zhanghaolun on 16/11/22.
   */
  @SuppressWarnings({"PMD.AbstractNaming", "PMD.AbstractClassWithoutAbstractMethod"})
  abstract class OAuth2Utils {
  
    private OAuth2Utils() {
    }
  
    static Boolean isOAuth2Authentication(final Principal principal) {
      return principal instanceof OAuth2Authentication;
    }
  
    static GenericUser fromOAuth2Authentication(final Principal principal) {
      final GenericUser result;
  
      final OAuth2Authentication oauth2Authentication = (OAuth2Authentication) principal;
      final Authentication auth = oauth2Authentication.getUserAuthentication();
  
      if (oauth2Authentication.isClientOnly() || auth == null || auth.getDetails() == null) {
        result = null;
      } else {
        final boolean accountNonExpired = true;
        final boolean accountNonLocked = true;
        @SuppressWarnings("unchecked")
        final Map<String, Object> details = (Map<String, Object>) auth.getDetails();
        @SuppressWarnings("unchecked")
        final Set<GrantedAuthority> authorities =
          ((Collection<Map<String, String>>) details.get("authorities")).stream()
            .map(authority -> new BaseGrantedAuthority(authority.get("authority")))
            .collect(toSet());
        final boolean credentialsNonExpired = true;
        final boolean enabled = true;
        final String password = System.getProperty("blankPassword", "");
        final String username = auth.getPrincipal().toString();
        final String uuid = ((OAuth2AuthenticationDetails) oauth2Authentication.getDetails()).getTokenValue();
  
        result = new GenericUser(accountNonExpired, accountNonLocked, authorities, credentialsNonExpired,
          enabled, password, username, ImmutableMap.of(), // TODO pass properties ?
          Defaults.now(), uuid);
      }
      
      return result;
    }
  }