Added library fetching functionality to the bootstrap launcher.

Author: sebinside

.gitignore

@@ -26,5 +26,7 @@ project/plugins/project/
 /plugins.sbt
 /config/
 
-# resources of the bootstrap project (everything is generated with sbt bs)
-/bootstrap/src/main/resources/
+# resources of the bootstrap project
+/bootstrap/src/main/resources/
+/bin/
+/lib/

bootstrap/build.sbt

@@ -1,3 +1,6 @@
 name := "chatoverflow-bootstrap"
 version := "0.1"
-assemblyJarName in assembly := "ChatOverflow.jar"
+assemblyJarName in assembly := "ChatOverflow.jar"
+
+libraryDependencies += "org.scala-lang.modules" %% "scala-xml" % "1.1.1"
+fork := true

bootstrap/src/main/scala/Bootstrap.scala

@@ -1,13 +1,91 @@
+import java.io.File
+import java.net.{HttpURLConnection, URL}
+import java.nio.file.Paths
+
+import scala.sys.process._
+
 object Bootstrap {
 
+  val currentFolderPath: String = Paths.get("").toAbsolutePath.toString
+  val javaHomePath: String = System.getProperty("java.home")
+
   def main(args: Array[String]): Unit = {
-    println("Hello! I'm the bootstrap launcher...")
+
+    if (testValidity()) {
+      if (checkLibraries(args)) {
+        // TODO: Create java path and classpath, just print for now (testing purposes)
+      }
+    }
+  }
+
+  def checkLibraries(args: Array[String]): Boolean = {
+
+    val libFolder = new File(s"$currentFolderPath/lib")
+    // Args contains --reload or lib folder is non existent?
+    if ((args.length > 0 && args.head == "--reload") || !libFolder.exists()) {
+
+      // Create or clean directory
+      if (libFolder.exists()) {
+        for (libFile <- libFolder.listFiles()) {
+          libFile.delete()
+        }
+      } else {
+        libFolder.mkdir()
+      }
+
+      // Download all libraries
+      downloadLibraries()
+
+    } else {
+      true
+    }
+  }
+
+  def downloadLibraries(): Boolean = {
+
+    // Get dependency xml and read dependencies with their download URL
+    val dependencyStream = getClass.getResourceAsStream("/dependencies.xml")
+    val dependencyXML = xml.XML.load(dependencyStream)
+    val dependencies = for (dependency <- dependencyXML \\ "dependency")
+      yield ((dependency \ "name").text.trim, (dependency \ "url").text.trim)
+
+    for ((name, url) <- dependencies) {
+      downloadLibrary(name, url)
+    }
+
+    true
+  }
+
+  private def downloadLibrary(libraryName: String, libraryURL: String): Unit = {
+    val url = new URL(libraryURL)
+
+    val connection = url.openConnection().asInstanceOf[HttpURLConnection]
+    connection.setConnectTimeout(5000)
+    connection.setReadTimeout(5000)
+    connection.connect()
+
+    if (connection.getResponseCode >= 400) {
+
+    }
+    // TODO: Retry 3 times
+    // TODO: Feedback on download progress
+    else {
+
+      // TODO: try
+      url #> new File(s"$currentFolderPath/lib/${libraryURL.substring(libraryURL.lastIndexOf("/"))}") !!
+    }
+  }
+
+  private def testValidity(): Boolean = {
+    // The only validity check for now is the existence of a bin folder
+    new File(currentFolderPath + "/bin").exists()
   }
 
   /*
+  TODO: Code deploy task (copying files, used after sbt clean and assembly)
   TODO: Code bootstrap launcher
   1. Bootstrap launcher checks integrity (bin folder existing)
-  2. Bootstrap launcher checks libraries (no lib folder or flag -> Download everything)
+  2. Bootstrap launcher checks libraries (no lib folder or flag -> Download everything
   3. Bootstrap launcher checks java path launched with and starts java -cp "..." chat overflow main class
    */