12 files changed, 326 insertions, 13 deletions

diff --git a/app/build.gradle b/app/build.gradle
index 99e9226..41c75ef 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -70,6 +70,14 @@ android {
   buildFeatures {
     dataBinding = true
   }
+
+  packagingOptions {
+    // clashing in dependencies (Apache Mina FtpServer)
+    exclude 'META-INF/DEPENDENCIES'
+    exclude 'META-INF/spring.schemas'
+    exclude 'META-INF/spring.handlers'
+    exclude 'META-INF/license.txt'
+  }
 }
 
 dependencies {
@@ -88,6 +96,7 @@ dependencies {
   implementation('org.apache.commons:commons-configuration2:2.3') { exclude group: 'commons-logging', module: 'commons-logging' }
   implementation('commons-beanutils:commons-beanutils:1.9.3') { exclude group: 'commons-logging', module: 'commons-logging' }
   implementation('commons-io:commons-io:2.6') { exclude group: 'commons-logging', module: 'commons-logging' }
+  implementation('org.apache.ftpserver:ftpserver:1.1.1') { exclude group: 'org.slf4j', module: 'slf4j-log4j12' }
 }
 
 repositories {
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 5100915..ffbb3e3 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -1,5 +1,5 @@
 # Tinc App, an Android binding and user interface for the tinc mesh VPN daemon
-# Copyright (C) 2017-2019 Pacien TRAN-GIRARD
+# Copyright (C) 2017-2020 Pacien TRAN-GIRARD
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -15,6 +15,8 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 -keep class org.apache.commons.** { *; }
+-keep class org.apache.mina.** { *; }
+-keep class org.apache.ftpserver.** { *; }
 -keep class org.bouncycastle.**
 -keep class ch.qos.** { *; }
 -keep class org.slf4j.** { *; }
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index c86ec8f..020d62d 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -81,6 +81,10 @@
             </intent-filter>
         </service>
 
+        <service
+            android:name="org.pacien.tincapp.service.ConfigurationFtpService">
+        </service>
+
     </application>
 
 </manifest>
diff --git a/app/src/main/java/org/pacien/tincapp/activities/configure/ConfigurationFtpServerFragment.kt b/app/src/main/java/org/pacien/tincapp/activities/configure/ConfigurationFtpServerFragment.kt
new file mode 100644
index 0000000..b97a15e
--- /dev/null
+++ b/app/src/main/java/org/pacien/tincapp/activities/configure/ConfigurationFtpServerFragment.kt
@@ -0,0 +1,72 @@
+/*
+ * Tinc App, an Android binding and user interface for the tinc mesh VPN daemon
+ * Copyright (C) 2017-2020 Pacien TRAN-GIRARD
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.pacien.tincapp.activities.configure
+
+import android.content.Intent
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.databinding.Observable
+import androidx.databinding.ObservableBoolean
+import org.pacien.tincapp.activities.BaseFragment
+import org.pacien.tincapp.databinding.ConfigureToolsConfigurationFtpServerFragmentBinding
+import org.pacien.tincapp.service.ConfigurationFtpService
+
+/**
+ * @author pacien
+ */
+class ConfigurationFtpServerFragment : BaseFragment() {
+  private val ftpServerStartListener = object : Observable.OnPropertyChangedCallback() {
+    override fun onPropertyChanged(sender: Observable, propertyId: Int) {
+      binding.ftpEnabled = (sender as ObservableBoolean).get()
+    }
+  }
+
+  private lateinit var binding: ConfigureToolsConfigurationFtpServerFragmentBinding
+
+  override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
+    binding = ConfigureToolsConfigurationFtpServerFragmentBinding.inflate(inflater, container, false)
+    binding.ftpUsername = ConfigurationFtpService.FTP_USERNAME
+    binding.ftpPassword = ConfigurationFtpService.FTP_PASSWORD
+    binding.ftpPort = ConfigurationFtpService.FTP_PORT
+    binding.toggleFtpState = { toggleServer() }
+    return binding.root
+  }
+
+  override fun onResume() {
+    super.onResume()
+    ConfigurationFtpService.runningState.addOnPropertyChangedCallback(ftpServerStartListener)
+    binding.ftpEnabled = ConfigurationFtpService.runningState.get()
+  }
+
+  override fun onPause() {
+    ConfigurationFtpService.runningState.removeOnPropertyChangedCallback(ftpServerStartListener)
+    super.onPause()
+  }
+
+  private fun toggleServer() {
+    val targetServiceIntent = Intent(requireContext(), ConfigurationFtpService::class.java)
+
+    if (binding.ftpEnabled)
+      requireContext().stopService(targetServiceIntent)
+    else
+      requireContext().startService(targetServiceIntent)
+  }
+}
diff --git a/app/src/main/java/org/pacien/tincapp/service/ConfigurationFtpService.kt b/app/src/main/java/org/pacien/tincapp/service/ConfigurationFtpService.kt
new file mode 100644
index 0000000..c562768
--- /dev/null
+++ b/app/src/main/java/org/pacien/tincapp/service/ConfigurationFtpService.kt
@@ -0,0 +1,128 @@
+/*
+ * Tinc App, an Android binding and user interface for the tinc mesh VPN daemon
+ * Copyright (C) 2017-2020 Pacien TRAN-GIRARD
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.pacien.tincapp.service
+
+import android.app.Service
+import android.content.Intent
+import android.os.IBinder
+import androidx.databinding.ObservableBoolean
+import org.apache.ftpserver.FtpServer
+import org.apache.ftpserver.FtpServerFactory
+import org.apache.ftpserver.ftplet.*
+import org.apache.ftpserver.listener.ListenerFactory
+import org.apache.ftpserver.usermanager.UsernamePasswordAuthentication
+import org.apache.ftpserver.usermanager.impl.WritePermission
+import org.pacien.tincapp.R
+import org.pacien.tincapp.context.App
+import org.pacien.tincapp.extensions.Java.defaultMessage
+import org.slf4j.LoggerFactory
+import java.io.IOException
+
+/**
+ * FTP server service allowing a remote and local user to access and modify configuration files in
+ * the application's context.
+ *
+ * @author pacien
+ */
+class ConfigurationFtpService : Service() {
+  companion object {
+    const val FTP_PORT = 65521 // tinc port `concat` FTP port
+    const val FTP_USERNAME = "tincapp"
+    val FTP_HOME_DIR = App.getContext().applicationInfo.dataDir!!
+    val FTP_PASSWORD = generateRandomString(8)
+
+    val runningState = ObservableBoolean(false)
+
+    private fun generateRandomString(length: Int): String {
+      val alphabet = ('a'..'z') + ('A'..'Z') + ('0'..'9')