refs #115: Support git access via ssh (1st step)

EXPERIMENTAL

TODOs

* Authentication (PublicKey)
* Publickey management in profile view
* Commit hooks integration (WebHook too)
* Parse command correctly
* Make Configurable many options(enable/disable, port, etc...)
* ShellProcessFactory
* Test, test, test...

src/main/scala/servlet/SshServiceListener.scala

@@ -7,43 +7,49 @@ import org.apache.sshd.server._
 import org.apache.sshd.server.session.ServerSession
 import java.io.{OutputStream, InputStream}
 import org.slf4j.LoggerFactory
+import org.eclipse.jgit.transport.{ReceivePack, UploadPack}
+import org.eclipse.jgit.api.Git
+import util.Directory._
+import util.ControlUtil._
+import org.apache.sshd.server.command.UnknownCommand
 
 /*
  * Start a SSH Service Daemon
+ *
+ * How to use ?
+ * git clone ssh://username@host_or_ip:29418/username/repository_name.git
+ *
  */
 class SshServiceListener extends ServletContextListener {
+  // TODO SshServer should be controllable by admin view (start and stop)
+  // TODO Use Singleton object SshServer instance management
   private val logger = LoggerFactory.getLogger(classOf[SshServiceListener])
 
   val sshService = SshServer.setUpDefaultServer
-  // TODO make configurable ssh feature
+
+  // TODO allow to disable ssh feature(ssh feature requires many stability test)
   val enableSsh = true
 
   override def contextInitialized(sce: ServletContextEvent): Unit = {
     if (!enableSsh) return
-    sshService.setPort(29418)
 
+    sshService.setPort(29418) // TODO must be configurable
+
+    // TODO PasswordAuthentication should be disable
+    // TODO Use PublicKeyAuthentication only => and It's stored db on account profile view
     val authenticator = new MyPasswordAuthenticator
     sshService.setPasswordAuthenticator(authenticator)
+
     // TODO gitbucket.ser should be in GITBUCKET_HOME
     sshService.setKeyPairProvider(new SimpleGeneratorHostKeyProvider("gitbucket.ser"))
+
     sshService.setCommandFactory(new CommandFactory {
       override def createCommand(command: String): Command = {
-        logger.error("createCommand!")
-        return new Command{
-          override def destroy(): Unit = {}
-
-          override def start(env: Environment): Unit = {
-            logger.info("start command")
-            logger.info(env.getEnv.toString)
-          }
-
-          override def setExitCallback(callback: ExitCallback): Unit = {}
-
-          override def setErrorStream(err: OutputStream): Unit = {}
-
-          override def setOutputStream(out: OutputStream): Unit = {}
-
-          override def setInputStream(in: InputStream): Unit = {}
+        logger.info(s"command: String -> ${command}")
+        command match {
+          case s if s.startsWith("git-upload-pack ") => new GitUploadPack(command)
+          case s if s.startsWith("git-receive-pack") => new GitReceivePack(command)
+          case _ => new UnknownCommand(command)
         }
       }
     })
@@ -56,11 +62,89 @@ class SshServiceListener extends ServletContextListener {
 
 }
 
+// always true authenticator... TODO Implements PublicKeyAuthenticator
 class MyPasswordAuthenticator extends PasswordAuthenticator {
   private val logger = LoggerFactory.getLogger(classOf[MyPasswordAuthenticator])
 
   override def authenticate(username: String, password: String, session: ServerSession): Boolean = {
-    logger.error("authenticate!!!")
+    logger.info("noop authenticate!!!")
     true
   }
 }
+
+abstract class GitCommand(val command: String) extends Command {
+  private val logger = LoggerFactory.getLogger(classOf[GitCommand])
+  val (gitCommand, owner, repositoryName) = parseCommand
+  var err: OutputStream = null
+  var in: InputStream = null
+  var out: OutputStream = null
+  var callback: ExitCallback = null
+
+  def runnable: Runnable
+
+  override def start(env: Environment): Unit = {
+    logger.info(s"start command : ${command}")
+    logger.info(s"parsed command : ${gitCommand}, ${owner}, ${repositoryName}")
+    val thread = new Thread(runnable)
+    thread.start
+  }
+
+  override def destroy(): Unit = {
+  }
+
+  override def setExitCallback(callback: ExitCallback): Unit = {
+    this.callback = callback
+  }
+
+  override def setErrorStream(err: OutputStream): Unit = {
+    this.err = err
+  }
+
+  override def setOutputStream(out: OutputStream): Unit = {
+    this.out = out
+  }
+
+  override def setInputStream(in: InputStream): Unit = {
+    this.in = in
+  }
+
+  private def parseCommand: Tuple3[String, String, String] = {
+    // command sample: git-upload-pack '/username/repository_name.git'
+    // command sample: git-receive-pack '/username/repository_name.git'
+    // TODO This is not correct....
+    val splitted = command.split(" ")
+    val gitCommand = splitted(0)
+    val gitUser = splitted(1).substring(1, splitted(1).length - 5).split("/")(1)
+    val gitRepo = splitted(1).substring(1, splitted(1).length - 5).split("/")(2)
+    (gitCommand, gitUser, gitRepo)
+  }
+}
+class GitUploadPack(command: String) extends GitCommand(command: String) {
+  override val runnable = new Runnable {
+    override def run(): Unit = {
+      using(Git.open(getRepositoryDir(owner, repositoryName))) {
+        git =>
+          val repository = git.getRepository
+          val upload = new UploadPack(repository)
+          upload.upload(in, out, err)
+          callback.onExit(0)
+      }
+    }
+  }
+}
+
+class GitReceivePack(command: String) extends GitCommand(command: String) {
+  override val runnable = new Runnable {
+    override def run(): Unit = {
+      using(Git.open(getRepositoryDir(owner, repositoryName))) {
+        git =>
+          val repository = git.getRepository
+          val receive = new ReceivePack(repository)
+          // TODO ReceivePack has many options. Need more check.
+          receive.receive(in, out, err)
+          callback.onExit(0)
+      }
+    }
+  }
+}
+