home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Lift Framework example source code file (HTTPRequestServlet.scala)

This example Lift Framework source code file (HTTPRequestServlet.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lift Framework tags/keywords

boolean, box, box, http, httprequest, inputstream, int, io, liftresponse, list, list, long, long, request, response, servlet, string, string, unsupportedoperationexception, util

The Lift Framework HTTPRequestServlet.scala source code

 * Copyright 2009-2011 WorldWide Conferencing, LLC
 * Licensed 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package net.liftweb 
package http 
package provider 
package servlet 

import java.io.{InputStream}
import java.util.{Locale}
import javax.servlet.http.{HttpServletRequest}
import org.apache.commons.fileupload.servlet._
import org.apache.commons.fileupload.ProgressListener
import net.liftweb.common._
import net.liftweb.util._
import Helpers._

class HTTPRequestServlet(val req: HttpServletRequest, val provider: HTTPProvider) extends HTTPRequest {
  private lazy val ctx = {
    new HTTPServletContext(req.getSession.getServletContext)

  lazy val cookies: List[HTTPCookie] = {
    req.getSession(false) // do this to make sure we capture the JSESSIONID cookie
    (Box !! req.getCookies).map(_.toList.map(c => HTTPCookie(c.getName,
      Box !! (c.getValue),
      Box !! (c.getDomain),
      Box !! (c.getPath),
      Box !! (c.getMaxAge),
      Box !! (c.getVersion),
      Box !! (c.getSecure)))) openOr Nil

  lazy val authType: Box[String] = Box !! req.getAuthType

  def headers(name: String): List[String] = enumToList[String](req.getHeaders(name).asInstanceOf[java.util.Enumeration[String]])

  lazy val headers: List[HTTPParam] = enumToList[String](req.getHeaderNames.asInstanceOf[java.util.Enumeration[String]]).
          map(n => HTTPParam(n, headers(n)))

  def contextPath: String = req.getContextPath

  def context: HTTPContext = ctx

  def contentType = Box !! req.getContentType

  // don't cache... allow multiple sessions for the request
  // necessary for session destruction on login
  def session = new HTTPServletSession(req getSession)

  def uri = req.getRequestURI

  def url = req.getRequestURL.toString

  lazy val queryString: Box[String] = Box !! req.getQueryString

  def param(name: String): List[String] = req.getParameterValues(name) match {case null => Nil case x => x.toList}

  lazy val params: List[HTTPParam] = enumToList[String](req.getParameterNames.asInstanceOf[java.util.Enumeration[String]]).
          map(n => HTTPParam(n, param(n)))

  lazy val paramNames: List[String] = params map (_.name)

  def remoteAddress: String = req.getRemoteAddr

   * The User-Agent of the request
  lazy val userAgent: Box[String] =  headers find (_.name equalsIgnoreCase "user-agent") flatMap (_.values.headOption)

  def remotePort: Int = req.getRemotePort

  def remoteHost: String = req.getRemoteHost

  def serverName = req getServerName

  def scheme: String = req getScheme

  def serverPort = req getServerPort

  def method: String = req.getMethod

  def locale: Box[Locale] = Box !! req.getLocale

  def inputStream: InputStream = req.getInputStream

  def multipartContent_? = ServletFileUpload.isMultipartContent(req)

   * Destroy the underlying servlet session
  def destroyServletSession() {
      httpSession <- Box !! req.getSession(false)
    } yield httpSession.invalidate()

   * @return the sessionID (if there is one) for this request.  This will *NOT* create
   * a new session if one does not already exist
  def sessionId: Box[String] =
      httpSession <- Box !! req.getSession(false)
      id <- Box !! httpSession.getId
    } yield id

  def extractFiles: List[ParamHolder] = (new Iterator[ParamHolder] {
    val mimeUpload = (new ServletFileUpload)
    mimeUpload.setProgressListener(new ProgressListener {
      lazy val progList: (Long, Long, Int) => Unit = S.session.flatMap(_.progressListener) openOr LiftRules.progressListener

      def update(a: Long, b: Long, c: Int) {progList(a, b, c)}

    val what = mimeUpload.getItemIterator(req)

    def hasNext = what.hasNext

    import scala.collection.JavaConversions._

    def next = what.next match {
      case f if (f.isFormField) => NormalParamHolder(f.getFieldName, new String(readWholeStream(f.openStream), "UTF-8"))
      case f => {
        val headers = f.getHeaders()
        val names: List[String] = if (headers eq null) Nil else headers.getHeaderNames().asInstanceOf[java.util.Iterator[String]].toList
        val map: Map[String, List[String]] = Map(names.map(n => n -> headers.getHeaders(n).asInstanceOf[java.util.Iterator[String]].toList) :_*)
        LiftRules.withMimeHeaders(map) {
          LiftRules.handleMimeFile(f.getFieldName, f.getContentType, f.getName, f.openStream)

  def setCharacterEncoding(encoding: String) = req.setCharacterEncoding(encoding)

  def snapshot: HTTPRequest  = new OfflineRequestSnapshot(this, provider)

  private lazy val asyncProvider: Box[ServletAsyncProvider] =

  def resumeInfo : Option[(Req, LiftResponse)] = asyncProvider.flatMap(_.resumeInfo)

  def suspend(timeout: Long): RetryState.Value = asyncProvider.open_!.suspend(timeout) // open_! is bad, but presumably, the suspendResume support was checked

  def resume(what: (Req, LiftResponse)): Boolean = asyncProvider.open_!.resume(what)

  lazy val suspendResumeSupport_? = {
    map(_.suspendResumeSupport_? && 
        (asyncProvider.map(_.suspendResumeSupport_?) openOr
         false)) openOr false

private class OfflineRequestSnapshot(req: HTTPRequest, val provider: HTTPProvider) extends HTTPRequest {

  private val _cookies = List(req.cookies :_*)

  private val _headers = List(req.headers :_*)

  private val _params = List(req.params :_*)

  def cookies: List[HTTPCookie] = _cookies

  val authType: Box[String] = req.authType

  def headers(name: String): List[String] = _headers.filter(_.name == name).map(_.name)

  def headers: List[HTTPParam] = _headers

  val contextPath: String = req.contextPath

  val context: HTTPContext = req.context

  val contentType: Box[String] = req.contentType

  val uri: String = req.uri

  val url: String = req.url

  val queryString: Box[String] = req.queryString

  def param(name: String): List[String] = _params.filter(_.name == name).map(_.name)

  def params: List[HTTPParam] = _params

  def paramNames: List[String] = _params.map(_.name)

   * Destroy the underlying servlet session... null for offline requests
  def destroyServletSession() {
    // do nothing here

  val session: HTTPSession = req.session

  val sessionId: Box[String] = req.sessionId

  val remoteAddress: String = req.remoteAddress

  val remotePort: Int = req.remotePort

  val remoteHost: String = req.remoteHost

  val serverName: String = req.serverName

  val scheme: String = req.scheme

  val serverPort: Int = req.serverPort

  val method: String = req.method

  val resumeInfo : Option[(Req, LiftResponse)] = req resumeInfo

  def suspend(timeout: Long): RetryState.Value =
    throw new UnsupportedOperationException("Cannot suspend a snapshot")

  def resume(what: (Req, LiftResponse)): Boolean =
    throw new UnsupportedOperationException("Cannot resume a snapshot")

  def suspendResumeSupport_? = false

  def inputStream: InputStream =
    throw new UnsupportedOperationException("InputStream is not available")

  val multipartContent_? : Boolean = req.multipartContent_?

  def extractFiles: List[ParamHolder] =
    throw new UnsupportedOperationException("It is unsafe to extract files")

  val locale: Box[Locale] = req.locale

  def setCharacterEncoding(encoding: String) =
    throw new UnsupportedOperationException("It is unsafe to set the character encoding ")

  def snapshot = this

   * The User-Agent of the request
  lazy val userAgent: Box[String] =  headers find (_.name equalsIgnoreCase "user-agent") flatMap (_.values.headOption)


Other Lift Framework examples (source code examples)

Here is a short list of links related to this Lift Framework HTTPRequestServlet.scala source code file:

my book on functional programming


new blog posts


Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.