platform.content.default404/src/main/scala/org/apache/clerezza/platform/content/default404/DefaultPageNotFoundService.scala

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.clerezza.platform.content.default404

import org.apache.clerezza.platform.content.PageNotFoundService
import javax.ws.rs.core.UriInfo
import java.io.FileNotFoundException
import java.io.InputStream
import java.net.URL
import java.security.AccessController
import java.security.PrivilegedAction
import javax.ws.rs.core.Response
import javax.ws.rs.core.Response.Status

/**
 * This returns the content of the resource /page-not-found dereferenced as uri
 * with the same authority section as the request.
 */
class DefaultPageNotFoundService extends PageNotFoundService {

  private val notFoundPagePath = "/page-not-found"

  override def createResponse(uriInfo: UriInfo) = {
    if (uriInfo.getPath == notFoundPagePath) {
      Response.status(Status.NOT_FOUND).build();
    } else {
      val pageNotFoundUrl = new URL(uriInfo.getBaseUri.toURL, notFoundPagePath)
      AccessController.doPrivileged(
        new PrivilegedAction[Option[(String, InputStream)]] {
          def run() = {
            val connection = pageNotFoundUrl.openConnection()
            try {
              Some(connection.getContentType, connection.getInputStream)
            } catch {
              case _: FileNotFoundException => None
            }
          }
        }
      ) match {
        case Some((mediaTypeString, in)) => Response.status(Status.NOT_FOUND).`type`(mediaTypeString).entity(in).build();
        case None => Response.status(Status.NOT_FOUND).build();
      }

    }
  }
  
}