package com.atlassian.plugins.rest.module.sal.websudo;
   
   import com.atlassian.plugins.rest.common.sal.websudo.WebSudoResourceContext;
   import com.atlassian.plugins.rest.module.servlet.ServletUtils;
   import com.atlassian.sal.api.websudo.WebSudoManager;
   
   import javax.servlet.http.HttpServletRequest;
   
   public class SalWebSudoResourceContext implements WebSudoResourceContext
  {
      private static final String BASIC_AUTHZ_TYPE_PREFIX = "Basic ";
  
      private final WebSudoManager webSudoManager;
  
      public SalWebSudoResourceContext(final WebSudoManager webSudoManager)
      {
          this.webSudoManager = webSudoManager;
      }
  
      /**
       * Checks if WebSudo protection is required.
       * <p/>
       * <ul>
       * <li>If clients authenticate using Basic-Auth WebSudo is not required.</li>
       * <li>If the current request is already protected (or if WebSudo is disabled in the host application) WebSudo is not required.</li>
       * </ul>
       *
       * @return true if resource need to be protected by WebSudo
       */
      public boolean shouldEnforceWebSudoProtection()
      {
          final HttpServletRequest r = ServletUtils.getHttpServletRequest();
          // If the servlet request is null (presumably because we are not running in a servlet container) there is no point in making use of WebSudo.
          if (null == r)
          {
              return false;
          }
  
          // We can skip web sudo if this is a request authenticated by BASIC-AUTH
          final String authHeader = r.getHeader("Authorization"); // as per RFC2616
          if (null != authHeader && authHeader.startsWith(BASIC_AUTHZ_TYPE_PREFIX))
          {
              return false;
          }
  
          return !webSudoManager.canExecuteRequest(r);
      }
  }