Play Framework/Scala example source code file (ServerSSLEngine.scala)

This example Play Framework source code file (ServerSSLEngine.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Play Framework (and Scala) source code examples by using tags.

All credit for the original source code belongs to Play Framework; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Play Framework tags/keywords

applicationprovider, class, classcastexception, constructor, core, javasslengineprovider, must, no, play, play framework, scalasslengineprovider, server, serversslengine, ssl

The ServerSSLEngine.scala Play Framework example source code

/*
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */
package play.core.server.ssl

import play.server.api.{ SSLEngineProvider => ScalaSSLEngineProvider }
import play.server.{ SSLEngineProvider => JavaSSLEngineProvider }
import java.lang.reflect.Constructor
import play.core.ApplicationProvider

/**
 * This singleton object looks for a class of {{play.server.api.SSLEngineProvider}} or {{play.server.SSLEngineProvider}}
 * in the system property <pre>play.http.sslengineprovider</pre>.  if there is no instance found, it uses
 * DefaultSSLEngineProvider.
 *
 * If the class of {{SSLEngineProvider}} defined has a constructor with {{play.core.ApplicationProvider}} (for Scala) or
 * {{play.server.ApplicationProvider}} (for Java), then an application provider is passed in when a new instance of the
 * class is created.
 */
object ServerSSLEngine {

  def createSSLEngineProvider(applicationProvider: ApplicationProvider): JavaSSLEngineProvider = {
    val providerClassName = Option(System.getProperty("play.http.sslengineprovider")).getOrElse(classOf[DefaultSSLEngineProvider].getName)

    val classLoader = applicationProvider.get.map(_.classloader).getOrElse(this.getClass.getClassLoader)
    val providerClass = classLoader.loadClass(providerClassName)

    // NOTE: this is not like instanceof.  With isAssignableFrom, the subclass should be on the right.
    providerClass match {
      case i if classOf[ScalaSSLEngineProvider].isAssignableFrom(providerClass) =>
        createScalaSSLEngineProvider(i.asInstanceOf[Class[ScalaSSLEngineProvider]], applicationProvider)

      case s if classOf[JavaSSLEngineProvider].isAssignableFrom(providerClass) =>
        createJavaSSLEngineProvider(s.asInstanceOf[Class[JavaSSLEngineProvider]], applicationProvider)

      case _ =>
        throw new ClassCastException("Must define play.server.api.SSLEngineProvider or play.server.SSLEngineProvider as interface!")
    }
  }

  private def createJavaSSLEngineProvider(providerClass: Class[JavaSSLEngineProvider],
    applicationProvider: ApplicationProvider): JavaSSLEngineProvider = {
    var providerArgsConstructor: Constructor[_] = null
    var noArgsConstructor: Constructor[_] = null
    for (constructor <- providerClass.getConstructors) {
      val parameterTypes = constructor.getParameterTypes
      if (parameterTypes.length == 0) {
        noArgsConstructor = constructor
      } else if (parameterTypes.length == 1 && classOf[play.server.ApplicationProvider].isAssignableFrom(parameterTypes(0))) {
        providerArgsConstructor = constructor
      }
    }

    if (providerArgsConstructor != null) {
      val javaApplication = applicationProvider.get.map(a => new play.Application(a)).getOrElse(null)
      val javaAppProvider = new play.server.ApplicationProvider(javaApplication, applicationProvider.path)
      return providerArgsConstructor.newInstance(javaAppProvider).asInstanceOf[JavaSSLEngineProvider]
    }

    if (noArgsConstructor != null) {
      return noArgsConstructor.newInstance().asInstanceOf[play.server.SSLEngineProvider]
    }

    throw new ClassCastException("No constructor with (appProvider:play.server.ApplicationProvider) or no-args constructor defined!")
  }

  private def createScalaSSLEngineProvider(providerClass: Class[ScalaSSLEngineProvider],
    applicationProvider: ApplicationProvider): ScalaSSLEngineProvider = {

    var providerArgsConstructor: Constructor[ScalaSSLEngineProvider] = null
    var noArgsConstructor: Constructor[ScalaSSLEngineProvider] = null
    for (constructor <- providerClass.getConstructors) {
      val parameterTypes = constructor.getParameterTypes
      if (parameterTypes.length == 0) {
        noArgsConstructor = constructor.asInstanceOf[Constructor[ScalaSSLEngineProvider]]
      } else if (parameterTypes.length == 1 && classOf[ApplicationProvider].isAssignableFrom(parameterTypes(0))) {
        providerArgsConstructor = constructor.asInstanceOf[Constructor[ScalaSSLEngineProvider]]
      }
    }

    if (providerArgsConstructor != null) {
      return providerArgsConstructor.newInstance(applicationProvider)
    }

    if (noArgsConstructor != null) {
      return noArgsConstructor.newInstance()
    }

    throw new ClassCastException("No constructor with (appProvider:play.core.ApplicationProvider) or no-args constructor defined!")
  }
}