package com.atlassian.plugins.rest.module.security;
   
   import com.atlassian.plugins.rest.common.security.AuthenticationContext;
   import com.atlassian.plugins.rest.module.servlet.ServletUtils;
   import com.atlassian.sal.api.user.UserManager;
   import com.google.common.base.Preconditions;
   
   import java.security.Principal;
   
  /**
   * SAL implementation of the {@link AuthenticationContext}
   *
   * @since 1.0
   */
  public class SalAuthenticationContext implements AuthenticationContext {
      private final UserManager userManager;
  
      public SalAuthenticationContext(final UserManager userManager) {
          this.userManager = Preconditions.checkNotNull(userManager);
      }
  
      public Principal getPrincipal() {
          final String userName = getUserName();
          return userName != null ? new SalPrincipal(userName) : null;
      }
  
      public boolean isAuthenticated() {
          return getUserName() != null;
      }
  
      private String getUserName() {
          return userManager.getRemoteUsername(ServletUtils.getHttpServletRequest());
      }
  
      private static class SalPrincipal implements Principal {
          private final String userName;
  
          SalPrincipal(String userName) {
              this.userName = Preconditions.checkNotNull(userName);
          }
  
          public String getName() {
              return userName;
          }
  
          @Override
          public int hashCode() {
              return userName.hashCode();
          }
  
          @Override
          public boolean equals(Object obj) {
              return obj != null && (obj instanceof SalPrincipal) && ((SalPrincipal) obj).userName.equals(userName);
          }
  
          @Override
          public String toString() {
              return userName;
          }
      }
  }