/*
    * Licensed under the GPL License. You may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *   https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
    *
    * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
    * WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
    * PURPOSE.
   */
  package psiprobe;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import javax.servlet.ServletContext;
  
  import org.apache.catalina.Context;
  import org.apache.catalina.Valve;
  import org.apache.catalina.WebResource;
  import org.apache.catalina.deploy.NamingResourcesImpl;
  import org.apache.jasper.JspCompilationContext;
  import org.apache.jasper.Options;
  import org.apache.jasper.compiler.JspRuntimeContext;
  import org.apache.naming.ContextAccessController;
  import org.apache.tomcat.util.descriptor.web.ApplicationParameter;
  import org.apache.tomcat.util.descriptor.web.ContextResource;
  import org.apache.tomcat.util.descriptor.web.ContextResourceLink;
  import org.apache.tomcat.util.descriptor.web.FilterDef;
  import org.apache.tomcat.util.descriptor.web.FilterMap;
  
  import psiprobe.model.ApplicationParam;
  import psiprobe.model.ApplicationResource;
  import psiprobe.model.FilterInfo;
  import psiprobe.model.FilterMapping;
  
  /**
   * The Class Tomcat85ContainerAdapter.
   */
  public class Tomcat85ContainerAdapter extends AbstractTomcatContainer {
  
    @Override
    protected Valve createValve() {
      return new Tomcat85AgentValve();
    }
  
    @Override
    public boolean canBoundTo(String binding) {
      if (binding == null) {
        return false;
      }
      return binding.startsWith("Apache Tomcat/8.5")
          || binding.startsWith("Apache Tomcat (TomEE)/8.5")
          || binding.startsWith("NonStop(tm) Servlets For JavaServer Pages(tm) v8.5")
          || binding.startsWith("Pivotal tc") && binding.contains("/8.5");
    }
  
    /**
     * Gets the filter mappings.
     *
     * @param fmap the fmap
     * @param dm the dm
     * @param filterClass the filter class
     *
     * @return the filter mappings
     */
    protected List<FilterMapping> getFilterMappings(FilterMap fmap, String dm, String filterClass) {
      String[] urls = fmap.getURLPatterns();
      String[] servlets = fmap.getServletNames();
      List<FilterMapping> results = new ArrayList<>(urls.length + servlets.length);
      addFilterMapping(fmap.getFilterName(), dm, filterClass, urls, results, FilterMapType.URL);
      addFilterMapping(fmap.getFilterName(), dm, filterClass, servlets, results,
          FilterMapType.SERVLET_NAME);
      return results;
    }
  
    @Override
    protected JspCompilationContext createJspCompilationContext(String name, Options opt,
        ServletContext sctx, JspRuntimeContext jrctx, ClassLoader classLoader) {
  
      JspCompilationContext jcctx = new JspCompilationContext(name, opt, sctx, null, jrctx);
      jcctx.setClassLoader(classLoader);
      return jcctx;
    }
  
    @Override
    public void addContextResourceLink(Context context, List<ApplicationResource> resourceList) {
  
      NamingResourcesImpl namingResources = context.getNamingResources();
      for (ContextResourceLink link : namingResources.findResourceLinks()) {
        ApplicationResource resource = new ApplicationResource();
  
        logger.debug("reading resourceLink: {}", link.getName());
        resource.setApplicationName(context.getName());
       resource.setName(link.getName());
       resource.setType(link.getType());
       resource.setLinkTo(link.getGlobal());
 
       registerGlobalResourceAccess(link);
 
       resourceList.add(resource);
     }
   }
 
   @Override
   public void addContextResource(Context context, List<ApplicationResource> resourceList) {
     NamingResourcesImpl namingResources = context.getNamingResources();
     for (ContextResource contextResource : namingResources.findResources()) {
       ApplicationResource resource = new ApplicationResource();
 
       logger.info("reading resource: {}", contextResource.getName());
       resource.setApplicationName(context.getName());
       resource.setName(contextResource.getName());
       resource.setType(contextResource.getType());
       resource.setScope(contextResource.getScope());
       resource.setAuth(contextResource.getAuth());
       resource.setDescription(contextResource.getDescription());
 
       resourceList.add(resource);
     }
   }
 
   @Override
   public List<FilterMapping> getApplicationFilterMaps(Context context) {
     FilterMap[] fms = context.findFilterMaps();
     List<FilterMapping> filterMaps = new ArrayList<>(fms.length);
     for (FilterMap filterMap : fms) {
       if (filterMap != null) {
         String dm;
         switch (filterMap.getDispatcherMapping()) {
           case FilterMap.ASYNC:
             dm = "ASYNC";
             break;
           case FilterMap.ERROR:
             dm = "ERROR";
             break;
           case FilterMap.FORWARD:
             dm = "FORWARD";
             break;
           case FilterMap.INCLUDE:
             dm = "INCLUDE";
             break;
           case FilterMap.REQUEST:
             dm = "REQUEST";
             break;
           default:
             dm = "";
         }
 
         String filterClass = "";
         FilterDef fd = context.findFilterDef(filterMap.getFilterName());
         if (fd != null) {
           filterClass = fd.getFilterClass();
         }
 
         List<FilterMapping> filterMappings = getFilterMappings(filterMap, dm, filterClass);
         filterMaps.addAll(filterMappings);
       }
     }
     return filterMaps;
   }
 
   @Override
   public List<FilterInfo> getApplicationFilters(Context context) {
     FilterDef[] fds = context.findFilterDefs();
     List<FilterInfo> filterDefs = new ArrayList<>(fds.length);
     for (FilterDef filterDef : fds) {
       if (filterDef != null) {
         FilterInfo fi = getFilterInfo(filterDef);
         filterDefs.add(fi);
       }
     }
     return filterDefs;
   }
 
   /**
    * Gets the filter info.
    *
    * @param fd the fd
    *
    * @return the filter info
    */
   private static FilterInfo getFilterInfo(FilterDef fd) {
     FilterInfo fi = new FilterInfo();
     fi.setFilterName(fd.getFilterName());
     fi.setFilterClass(fd.getFilterClass());
     fi.setFilterDesc(fd.getDescription());
     return fi;
   }
 
   @Override
   public List<ApplicationParam> getApplicationInitParams(Context context) {
     /*
      * We'll try to determine if a parameter value comes from a deployment descriptor or a context
      * descriptor.
      *
      * Assumption: context.findParameter() returns only values of parameters that are declared in a
      * deployment descriptor.
      *
      * If a parameter is declared in a context descriptor with override=false and redeclared in a
      * deployment descriptor, context.findParameter() still returns its value, even though the value
      * is taken from a context descriptor.
      *
      * context.findApplicationParameters() returns all parameters that are declared in a context
      * descriptor regardless of whether they are overridden in a deployment descriptor or not or
      * not.
      */
     /*
      * creating a set of parameter names that are declared in a context descriptor and can not be
      * overridden in a deployment descriptor.
      */
     Set<String> nonOverridableParams = new HashSet<>();
     for (ApplicationParameter appParam : context.findApplicationParameters()) {
       if (appParam != null && !appParam.getOverride()) {
         nonOverridableParams.add(appParam.getName());
       }
     }
     List<ApplicationParam> initParams = new ArrayList<>(20);
     ServletContext servletCtx = context.getServletContext();
     for (String paramName : Collections.list(servletCtx.getInitParameterNames())) {
       ApplicationParam param = new ApplicationParam();
       param.setName(paramName);
       param.setValue(servletCtx.getInitParameter(paramName));
       /*
        * if the parameter is declared in a deployment descriptor and it is not declared in a context
        * descriptor with override=false, the value comes from the deployment descriptor
        */
       param.setFromDeplDescr(
           context.findParameter(paramName) != null && !nonOverridableParams.contains(paramName));
       initParams.add(param);
     }
     return initParams;
   }
 
   @Override
   public boolean resourceExists(String name, Context context) {
     return context.getResources().getResource(name) != null;
   }
 
   @Override
   public InputStream getResourceStream(String name, Context context) throws IOException {
     WebResource resource = context.getResources().getResource(name);
     return resource.getInputStream();
   }
 
   @Override
   public Long[] getResourceAttributes(String name, Context context) {
     Long[] result = new Long[2];
     WebResource resource = context.getResources().getResource(name);
     result[0] = resource.getContentLength();
     result[1] = resource.getLastModified();
     return result;
   }
 
   /**
    * Returns the security token required to bind to a naming context.
    *
    * @param context the catalina context
    *
    * @return the security token for use with <code>ContextBindings</code>
    */
   @Override
   protected Object getNamingToken(Context context) {
     // Used by NamingContextListener when setting up JNDI context
     Object token = context.getNamingToken();
     if (!ContextAccessController.checkSecurityToken(context, token)) {
       logger.error("Couldn't get a valid security token. ClassLoader binding will fail.");
     }
     return token;
   }
 
 }