First version

.github/workflows/android.yml

@@ -0,0 +1,21 @@
+name: Android CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Build with Gradle
+      run: ./gradlew build

.github/workflows/buildApk.yml

@@ -0,0 +1,29 @@
+name: Build Apk
+
+on:
+    push:
+      branches: [ master ]
+    pull_request:
+      branches: [ master ]
+
+jobs:
+
+
+  build:
+    name: Generate APK
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Build Debug APK
+      run: bash ./gradlew :app:assembleDebug
+              
+    - name: Upload APK
+      uses: actions/upload-artifact@v2
+      with:
+        name: App
+        path: ${{ github.workspace }}/app/build/outputs/apk/debug/app-debug.apk

.gitignore

@@ -0,0 +1,14 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx

LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
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+
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+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
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+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -0,0 +1,2 @@
+# android-sms-gateway-server
+Android App, which allows you to send and receive sms via REST-API

app/.gitignore

@@ -0,0 +1 @@
+/build

app/build.gradle

@@ -0,0 +1,90 @@
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 29
+
+    testOptions {
+        unitTests.returnDefaultValues = true
+        unitTests.all {
+            useJUnitPlatform()
+        }
+        unitTests {
+            includeAndroidResources = true
+        }
+    }
+
+
+    defaultConfig {
+        applicationId "net.folivo.android.smsGatewayServer"
+        minSdkVersion 27
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    packagingOptions {
+        exclude 'META-INF/*'
+    }
+
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+
+
+}
+
+
+dependencies {
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
+    def fragment_version = "1.3.0-alpha08"
+    def kotest_version = "4.2.5"
+    def activity_version = "1.2.0-alpha08"
+    def mockk_version = "1.10.0"
+    def ktor_version = "1.4.1"
+
+
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+
+    testImplementation "io.kotest:kotest-runner-junit5:$kotest_version" // for kotest framework
+    testImplementation "io.kotest:kotest-assertions-core:$kotest_version"
+    // for kotest core jvm assertions
+    testImplementation "io.kotest:kotest-property:$kotest_version" // for kotest property test
+    testImplementation "io.kotest:kotest-extensions-robolectric:4.0.1"
+    testImplementation "io.mockk:mockk:$mockk_version"
+    testImplementation 'androidx.test:core:1.3.0'
+    testImplementation 'org.robolectric:robolectric:4.4'
+    testImplementation 'junit:junit:4.13'
+
+
+
+    implementation "io.ktor:ktor:$ktor_version"
+    implementation "io.ktor:ktor-server-netty:$ktor_version"
+    implementation "io.ktor:ktor-gson:$ktor_version"
+    implementation "io.ktor:ktor-auth:$ktor_version"
+    implementation "io.ktor:ktor-jackson:$ktor_version"
+    implementation "io.ktor:ktor-network-tls-certificates:$ktor_version"
+    implementation "io.ktor:ktor-client-cio:$ktor_version"
+    implementation "androidx.work:work-runtime-ktx:2.4.0"
+    implementation "androidx.activity:activity-ktx:$activity_version"
+    implementation "androidx.fragment:fragment:$fragment_version"
+    implementation 'androidx.core:core-ktx:1.3.2'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.3'
+    implementation 'ch.qos.logback:logback-classic:1.2.3'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.4.10"
+    implementation 'com.google.android.material:material:1.2.1'
+
+
+}

app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/main/AndroidManifest.xml

@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="net.folivo.android.smsGatewayServer">
+
+    <uses-permission android:name="android.permission.SEND_SMS" />
+    <uses-permission android:name="android.permission.READ_SMS" />
+    <uses-permission android:name="android.permission.WRITE_SMS" />
+    <uses-permission android:name="android.permission.RECEIVE_SMS" />
+    <uses-permission android:name="android.permission.RECEIVE_MMS" />
+    <uses-permission android:name="android.permission.RECEIVE_WAP_PUSH" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+
+        <service
+            android:name="net.folivo.android.smsGatewayServer.HeadlessSmsSendService"
+            android:enabled="true"
+            android:exported="true"
+            android:permission="android.permission.SEND_RESPOND_VIA_MESSAGE">
+            <intent-filter>
+                <action android:name="android.intent.action.RESPOND_VIA_MESSAGE" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+
+                <data android:scheme="sms" />
+                <data android:scheme="smsto" />
+                <data android:scheme="mms" />
+                <data android:scheme="mmsto" />
+            </intent-filter>
+        </service>
+
+        <activity android:name="net.folivo.android.smsGatewayServer.ComposeSmsActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.SEND" />
+                <action android:name="android.intent.action.SENDTO" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="sms" />
+                <data android:scheme="smsto" />
+                <data android:scheme="mms" />
+                <data android:scheme="mmsto" />
+            </intent-filter>
+        </activity>
+        <activity android:name="net.folivo.android.smsGatewayServer.MainActivity" android:configChanges="orientation|screenSize|screenLayout|keyboardHidden">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+
+                <category android:name="android.app.role.SMS" />
+            </intent-filter>
+        </activity> <!-- BroadcastReceiver that listens for incoming SMS messages -->
+        <receiver
+            android:name="net.folivo.android.smsGatewayServer.SmsReceiver"
+            android:permission="android.permission.BROADCAST_SMS">
+            <intent-filter>
+                <action android:name="android.provider.Telephony.SMS_DELIVER" />
+            </intent-filter>
+        </receiver> <!-- BroadcastReceiver that listens for incoming MMS messages -->
+        <receiver
+            android:name="net.folivo.android.smsGatewayServer.MmsReceiver"
+            android:permission="android.permission.BROADCAST_WAP_PUSH">
+            <intent-filter>
+                <action android:name="android.provider.Telephony.WAP_PUSH_DELIVER" />
+
+                <data android:mimeType="application/vnd.wap.mms-message" />
+            </intent-filter>
+        </receiver>
+    </application>
+
+</manifest>

app/src/main/java/net/folivo/android/smsGatewayServer/ComposeSmsActivity.kt

@@ -0,0 +1,5 @@
+package net.folivo.android.smsGatewayServer
+
+import androidx.appcompat.app.AppCompatActivity
+
+class ComposeSmsActivity : AppCompatActivity()

app/src/main/java/net/folivo/android/smsGatewayServer/HeadlessSmsSendService.kt

@@ -0,0 +1,12 @@
+package net.folivo.android.smsGatewayServer
+
+import android.app.Service
+import android.content.Intent
+import android.os.IBinder
+
+class HeadlessSmsSendService : Service() {
+
+    override fun onBind(intent: Intent): IBinder? {
+        return null
+    }
+}

app/src/main/java/net/folivo/android/smsGatewayServer/MainActivity.kt

@@ -0,0 +1,400 @@
+package net.folivo.android.smsGatewayServer
+
+import android.Manifest
+import android.app.Activity
+import android.app.role.RoleManager
+import android.content.Intent
+import android.content.SharedPreferences
+import android.content.SharedPreferences.OnSharedPreferenceChangeListener
+import android.content.pm.PackageManager
+import android.net.Uri
+import android.os.Build
+import android.os.Bundle
+import android.provider.Telephony
+import android.util.Log
+import android.widget.Button
+import android.widget.EditText
+import android.widget.Toast
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.activity.result.contract.ActivityResultContracts.StartActivityForResult
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.widget.AppCompatImageButton
+import androidx.appcompat.widget.SwitchCompat
+import androidx.work.*
+import java.lang.Exception
+import java.security.KeyStore
+import java.time.Duration
+import java.util.*
+import java.util.concurrent.ExecutionException
+import kotlin.time.ExperimentalTime
+
+
+class MainActivity : AppCompatActivity() {
+
+    private val logTag = MainActivity::class.java.simpleName
+
+    private val workManager = WorkManager.getInstance(this)
+    private val uniqueWorkName = "restApiWorker"
+
+    private lateinit var sharedPref: SharedPreferences
+
+
+    private val smsDefaultAppResultLauncher = registerForActivityResult(
+        StartActivityForResult()
+    ) {
+        if (it.resultCode == Activity.RESULT_OK) {
+            Log.i(logTag, "Default SMS app permission is granted.")
+        } else {
+            Log.i(logTag, "Default SMS app permission is not granted.")
+        }
+    }
+
+    private val certificateResultLauncher = registerForActivityResult(
+        StartActivityForResult()
+    ) {
+        if (it.resultCode == Activity.RESULT_OK) {
+            val intent = it.data
+            intent?.data?.also { uri ->
+                val sharedPref: SharedPreferences = this.getPreferences(MODE_PRIVATE)
+                val editor = sharedPref.edit()
+                editor.putString(getString(R.string.saved_certificate_uri_str_key), uri.toString())
+                editor.commit()
+                findViewById<EditText>(R.id.editTextPathKeyStore).setText(uri.toString())
+                Log.i(logTag, "certificate uri: $uri")
+
+                val takeFlags: Int = Intent.FLAG_GRANT_READ_URI_PERMISSION
+                contentResolver.takePersistableUriPermission(uri, takeFlags)
+            }
+        }
+    }
+
+    private val storagePermissionResultLauncher = registerForActivityResult(
+        ActivityResultContracts.RequestPermission()
+    ) { isGranted: Boolean ->
+        if (isGranted) {
+            Log.i(logTag, "Storage permission is granted.")
+        } else {
+            Log.i(logTag, "Storage permission is not granted.")
+        }
+    }
+
+    private val onSharedPreferenceChangeListener =
+        OnSharedPreferenceChangeListener { sharedPreferences, key ->
+            when (key) {
+                getString(R.string.saved_username_key) -> findViewById<EditText>(R.id.editTextUserName).hint =
+                    sharedPreferences.getString(key, "admin")
+                getString(R.string.saved_password_key) -> findViewById<EditText>(R.id.editTextPassword).hint =
+                    sharedPreferences.getString(key, "123")
+                getString(R.string.saved_keyStore_password_key) -> findViewById<EditText>(R.id.editTextKeyStorePassword).hint =
+                    sharedPreferences.getString(key, "")
+                getString(R.string.saved_certificate_uri_str_key) -> findViewById<EditText>(R.id.editTextPathKeyStore).hint =
+                    sharedPreferences.getString(key, "")
+            }
+        }
+
+
+    @ExperimentalTime
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        val editTextUserName = findViewById<EditText>(R.id.editTextUserName)
+        val editTextPassword = findViewById<EditText>(R.id.editTextPassword)
+        val editTextKeyStorePassword = findViewById<EditText>(R.id.editTextKeyStorePassword)
+        val editTextPathKeyStore = findViewById<EditText>(R.id.editTextPathKeyStore)
+
+
+        sharedPref = this.getPreferences(MODE_PRIVATE)
+        sharedPref.registerOnSharedPreferenceChangeListener(onSharedPreferenceChangeListener)
+
+        editTextUserName.hint =
+            sharedPref.getString(getString(R.string.saved_username_key), "admin")
+        editTextPassword.hint =
+            sharedPref.getString(getString(R.string.saved_password_key), "123")
+        editTextKeyStorePassword.hint =
+            sharedPref.getString(getString(R.string.saved_keyStore_password_key), "")
+        editTextPathKeyStore.hint =
+            sharedPref.getString(getString(R.string.saved_certificate_uri_str_key), "")
+
+        findViewById<SwitchCompat>(R.id.switchStartServer).isEnabled = isCertificateAvailable()
+
+        findViewById<Button>(R.id.buttonCheckCertificateAvailability).setOnClickListener {
+
+            val keyStorePassword =
+                editTextKeyStorePassword.text.toString()
+            val keyStorePath =
+                editTextPathKeyStore.text.toString()
+            val editor = sharedPref.edit()
+
+
+            if (!keyStorePassword.isBlank()) {
+                editor.putString(
+                    getString(R.string.saved_keyStore_password_key),
+                    keyStorePassword
+                )
+                editor.commit()
+            }
+
+            if (!keyStorePath.isBlank()) {
+                editor.putString(getString(R.string.saved_certificate_uri_str_key), keyStorePath)
+                editor.commit()
+            }
+
+            if (!isCertificateAvailable()) {
+                Toast.makeText(this, "Error loading certificate: ", Toast.LENGTH_SHORT).show()
+                findViewById<SwitchCompat>(R.id.switchStartServer).isEnabled = false
+            } else {
+                Toast.makeText(this, "Certificate loaded successfully", Toast.LENGTH_SHORT).show()
+                findViewById<SwitchCompat>(R.id.switchStartServer).isEnabled = true
+
+            }
+
+        }
+
+
+        findViewById<AppCompatImageButton>(R.id.buttonCertificate).setOnClickListener {
+
+
+            if (storagePermissionGranted()) {
+                // Choose a directory using the system's file picker.
+                val intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
+                    addCategory(Intent.CATEGORY_OPENABLE)
+                    type = "application/x-pkcs12"
+                }
+                certificateResultLauncher.launch(intent)
+
+            } else {
+                storagePermissionResultLauncher.launch(Manifest.permission.READ_EXTERNAL_STORAGE)
+
+            }
+
+
+        }
+
+        findViewById<SwitchCompat>(R.id.switchStartServer).setOnCheckedChangeListener { viewButton, isChecked ->
+
+            if (isDefaultSmsApp()) {
+                if (isChecked && !isUniqueWorkScheduled(uniqueWorkName)) {
+
+                    val txtUserName = editTextUserName.text.toString()
+                    val txtPassword = editTextPassword.text.toString()
+
+                    val editor = sharedPref.edit()
+
+                    if (!txtPassword.isBlank()) {
+                        editor.putString(getString(R.string.saved_password_key), txtPassword)
+                        editor.commit()
+                    }
+
+                    if (!txtUserName.isBlank()) {
+                        editor.putString(getString(R.string.saved_username_key), txtUserName)
+                        editor.commit()
+                    }
+
+
+                    if (!isCertificateAvailable()) {
+                        Toast.makeText(this, "Error loading the certificate", Toast.LENGTH_SHORT)
+                            .show()
+                        findViewById<SwitchCompat>(R.id.switchStartServer).isEnabled = false
+                    }
+
+
+                    val data =
+                        Data.Builder()
+                            .putString(
+                                "username",
+                                sharedPref.getString(
+                                    getString(R.string.saved_username_key),
+                                    "admin"
+                                )
+                            )
+                            .putString(
+                                "password",
+                                sharedPref.getString(getString(R.string.saved_password_key), "123")
+                            )
+                            .putString(
+                                "certificateUriStr",
+                                sharedPref.getString(
+                                    getString(R.string.saved_certificate_uri_str_key),
+                                    null
+                                )
+                            )
+                            .putString(
+                                "keyStorePassword",
+                                sharedPref.getString(
+                                    getString(R.string.saved_keyStore_password_key),
+                                    ""
+                                )
+                            )
+                            .build()
+
+                    val restApiWorkRequest =
+                        OneTimeWorkRequestBuilder<RestApiWorker>().setInputData(data)
+                            .addTag(uniqueWorkName)
+                            .build()
+
+                    workManager.enqueueUniqueWork(
+                        uniqueWorkName,
+                        ExistingWorkPolicy.KEEP,
+                        restApiWorkRequest
+                    )
+                }
+                if (!isChecked && isUniqueWorkScheduled(uniqueWorkName)) {
+                    workManager.cancelUniqueWork(uniqueWorkName)
+
+                }
+            } else {
+                requestSmsDefaultAppState()
+                viewButton.toggle()
+            }
+        }
+
+        findViewById<Button>(R.id.buttonDeleteMessages).setOnClickListener{
+
+            var toastText = "Messages deleted"
+            val messageManager = MessageManager(applicationContext)
+            val durationInMillis = Duration.ofDays(14).toMillis()
+            try {
+                messageManager.deleteInboxMessagesOlderThan(Calendar.getInstance().timeInMillis.minus(durationInMillis))
+            }catch (exception : Exception){
+                Log.w(logTag, exception.toString())
+                toastText = "Messages could not be deleted"
+            }
+            Toast.makeText(this, toastText, Toast.LENGTH_SHORT).show()
+
+        }
+
+        workManager.getWorkInfosForUniqueWorkLiveData(uniqueWorkName).observe(this) {
+
+            when (it.singleOrNull()?.state) {
+                WorkInfo.State.SUCCEEDED, WorkInfo.State.CANCELLED -> {
+                    Toast.makeText(
+                        this,
+                        getString(R.string.toast_server_terminated_successfully),
+                        Toast.LENGTH_SHORT
+                    ).show()
+                    Log.i(
+                        logTag,
+                        getString(R.string.toast_server_terminated_successfully) + ": " + it.single().state
+                    )
+                }
+                WorkInfo.State.FAILED -> {
+                    Toast.makeText(
+                        this,
+                        getString(R.string.toast_server_terminated_failed),
+                        Toast.LENGTH_SHORT
+                    ).show()
+                    Log.i(
+                        logTag,
+                        getString(R.string.toast_server_terminated_failed) + ": " + it.single().state
+                    )
+                    findViewById<SwitchCompat>(R.id.switchStartServer).toggle()
+                }
+
+                else -> {}
+            }
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        val switch = findViewById<SwitchCompat>(R.id.switchStartServer)
+        if ((isUniqueWorkScheduled(uniqueWorkName) && !switch.isChecked) || (!isUniqueWorkScheduled(
+                uniqueWorkName
+            ) && switch.isChecked)
+        ) {
+            switch.toggle()
+        }
+
+
+    }
+
+
+    override fun onDestroy() {
+        super.onDestroy()
+        if (isUniqueWorkScheduled(uniqueWorkName)) {
+            workManager.cancelUniqueWork(uniqueWorkName)
+        }
+    }
+
+    private fun isUniqueWorkScheduled(tag: String): Boolean {
+        return try {
+            val workerState = workManager.getWorkInfosForUniqueWork(tag).get().singleOrNull()?.state
+            workerState == WorkInfo.State.RUNNING || workerState == WorkInfo.State.ENQUEUED
+        } catch (e: ExecutionException) {
+            Log.w(logTag, e.stackTraceToString())
+            false
+        } catch (e: InterruptedException) {
+            Log.w(logTag, e.stackTraceToString())
+            false
+        }
+    }
+
+    private fun storagePermissionGranted(): Boolean {
+        return checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED
+    }
+
+    private fun isDefaultSmsApp(): Boolean {
+        return this.packageName == Telephony.Sms.getDefaultSmsPackage(this)
+    }
+
+
+    private fun requestSmsDefaultAppState() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            val roleManager: RoleManager = this.getSystemService(RoleManager::class.java)
+            // check if the app is having permission to be as default SMS app
+            val isRoleAvailable = roleManager.isRoleAvailable(RoleManager.ROLE_SMS)
+            if (isRoleAvailable) {
+                // check whether your app is already holding the default SMS app role.
+                val isRoleHeld = roleManager.isRoleHeld(RoleManager.ROLE_SMS)
+                if (!isRoleHeld) {
+                    val roleRequestIntent =
+                        roleManager.createRequestRoleIntent(RoleManager.ROLE_SMS)
+
+                    smsDefaultAppResultLauncher.launch(roleRequestIntent)
+
+                }
+            }
+        } else {
+            val intent = Intent(Telephony.Sms.Intents.ACTION_CHANGE_DEFAULT)
+            intent.putExtra(Telephony.Sms.Intents.EXTRA_PACKAGE_NAME, packageName)
+            smsDefaultAppResultLauncher.launch(intent)
+        }
+    }
+
+    private fun isCertificateAvailable(): Boolean {
+
+        val certificateUriStr =
+            sharedPref.getString(getString(R.string.saved_certificate_uri_str_key), "").orEmpty()
+        val keyStorePassword =
+            sharedPref.getString(getString(R.string.saved_keyStore_password_key), "").orEmpty()
+        val keyStore: KeyStore
+        val certificateFileNameWithoutExtension: String
+
+
+        try {
+            certificateFileNameWithoutExtension =
+                RestApiWorker.getKeyStoreFileName(
+                    applicationContext.contentResolver,
+                    Uri.parse(certificateUriStr)
+                )
+            keyStore = RestApiWorker.loadKeyStore(
+                applicationContext.contentResolver,
+                Uri.parse(certificateUriStr),
+                keyStorePassword
+            )
+        } catch (exception: Exception) {
+            Log.i(logTag, "isCertificateAvailable: false -> $exception")
+            return false
+        }
+        if (keyStore.getCertificate(certificateFileNameWithoutExtension) == null) {
+            Log.i(
+                logTag,
+                "isCertificateAvailable: false -> given alias does not exist or does not contain a certificate"
+            )
+            return false
+        }
+        return true
+    }
+
+}

app/src/main/java/net/folivo/android/smsGatewayServer/Message.kt

@@ -0,0 +1,10 @@
+package net.folivo.android.smsGatewayServer
+
+class Message(
+    val id: Long,
+    val number: String,
+    val body: String,
+    val dateReceived: String,
+    val dateSent: String,
+    val type: String
+)

app/src/main/java/net/folivo/android/smsGatewayServer/MessageManager.kt

@@ -0,0 +1,240 @@
+package net.folivo.android.smsGatewayServer
+
+import android.app.Activity
+import android.app.PendingIntent
+import android.content.*
+import android.database.Cursor
+import android.database.sqlite.SQLiteCantOpenDatabaseException
+import android.database.sqlite.SQLiteException
+import android.net.Uri
+import android.provider.Telephony
+import android.telephony.SmsManager
+import android.util.Log
+import io.ktor.http.*
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.channels.sendBlocking
+import java.lang.IllegalArgumentException
+import java.time.Instant
+import java.util.*
+import kotlin.collections.ArrayList
+
+
+class MessageManager(private val applicationContext: Context) {
+
+    private val logTag = MessageManager::class.java.simpleName
+
+
+    private val inboxURI: Uri = Telephony.Sms.Inbox.CONTENT_URI
+//    private val outboxURI: Uri = Telephony.Sms.Outbox.CONTENT_URI
+//    private val sentURI: Uri = Telephony.Sms.Sent.CONTENT_URI
+    private val allURI: Uri = Telephony.Sms.CONTENT_URI
+    private val messageProjection = arrayOf(Telephony.Sms._ID, Telephony.Sms.ADDRESS, Telephony.Sms.BODY, Telephony.Sms.DATE, Telephony.Sms.DATE_SENT, Telephony.Sms.TYPE)
+    private val contentResolver = applicationContext.contentResolver
+
+    private val sentAction = "sent"
+
+    @Throws(IllegalArgumentException::class)
+    suspend fun sendSms(
+        recipientPhoneNumber: String,
+        message: String,
+    ): Pair<HttpStatusCode, String> {
+
+        val sendStatusChannel = Channel<Int>(Channel.UNLIMITED)
+
+        applicationContext.registerReceiver(object : BroadcastReceiver() {
+            override fun onReceive(context: Context?, intent: Intent?) {
+                sendStatusChannel.sendBlocking(resultCode)
+            }
+        }, IntentFilter(sentAction))
+
+        val smsManager: SmsManager = SmsManager.getDefault()
+        val multipartMessageArray = smsManager.divideMessage(message)
+        val resultPair: Pair<HttpStatusCode, String>
+
+
+        // Send simple text message
+        if (multipartMessageArray.count() <= 1) {
+            val sentIntent = PendingIntent.getBroadcast(applicationContext,
+                Random().nextInt(),
+                Intent(sentAction),
+                PendingIntent.FLAG_UPDATE_CURRENT)
+
+            smsManager.sendTextMessage(
+                recipientPhoneNumber,
+                null,
+                message,
+                sentIntent,
+                null
+            )
+            Log.i(
+                logTag,
+                "Request to send simple text message: [message: $message , phone number: $recipientPhoneNumber]"
+            )
+
+            resultPair = convertSmsResultCode(sendStatusChannel.receive())
+
+
+            // Send multipart text message
+        } else {
+
+            val sentIntents = ArrayList<PendingIntent>()
+
+            for (i in 0 until multipartMessageArray.count()) {
+                sentIntents.add(PendingIntent.getBroadcast(applicationContext, i, Intent(sentAction), 0))
+            }
+            smsManager.sendMultipartTextMessage(
+                recipientPhoneNumber,
+                null,
+                multipartMessageArray,
+                sentIntents,
+                null
+            )
+            Log.i(
+                logTag,
+                "Request to send multipart text message: [message: $multipartMessageArray , phone number: $recipientPhoneNumber]"
+            )
+
+            val resultCodes = mutableListOf<Int>()
+            for (i in 0 until multipartMessageArray.count()) {
+                resultCodes.add(sendStatusChannel.receive())
+            }
+
+            val mergedResultCode = resultCodes.find{it != Activity.RESULT_OK} ?: Activity.RESULT_OK
+            resultPair = Pair(convertSmsResultCode(mergedResultCode).first, resultCodes.map{convertSmsResultCode(it)}.joinToString(prefix = "[", postfix = "]"))
+
+        }
+        if (resultPair.first.isSuccess()) {
+            Log.i(logTag, "Message has been successfully sent")
+        } else {
+            Log.i(logTag, "Message has not been successfully sent")
+        }
+        return resultPair
+    }
+
+    @Throws(SQLiteCantOpenDatabaseException::class, IllegalArgumentException::class, SQLiteException::class)
+    fun getInboxMessages(): ArrayList<Message> {
+        val cursor = contentResolver.query(
+            inboxURI,
+            messageProjection,
+            null,
+            null,
+            Telephony.Sms._ID + " ASC"
+        )
+            ?: throw (SQLiteCantOpenDatabaseException("Provider's table not found"))
+        return getArrayListFromTable(cursor)
+    }
+
+    @Throws(SQLiteCantOpenDatabaseException::class, IllegalArgumentException::class, SQLiteException::class)
+    fun getInboxMessagesFromIdUp(requestId: String): ArrayList<Message> {
+        val cursor = contentResolver.query(
+            inboxURI,
+            messageProjection,
+            Telephony.Sms._ID + " > " + requestId,
+            null,
+            Telephony.Sms._ID + " ASC"
+        )
+            ?: throw (SQLiteCantOpenDatabaseException("Provider's table not found"))
+
+        return getArrayListFromTable(cursor)
+    }
+
+    @Throws(IllegalArgumentException::class)
+    private fun getArrayListFromTable(cursor: Cursor?): ArrayList<Message> {
+        val smsList = ArrayList<Message>()
+        cursor?.use {
+            while (it.moveToNext()) {
+                val id = it.getLong(it.getColumnIndexOrThrow(Telephony.Sms._ID))
+                val number =
+                    it.getString(it.getColumnIndexOrThrow(Telephony.Sms.ADDRESS))
+                val body = it.getString(it.getColumnIndexOrThrow(Telephony.Sms.BODY))
+                val dateReceived =
+                    Instant.ofEpochMilli(it.getLong(it.getColumnIndexOrThrow(Telephony.Sms.DATE)))
+                        .toString()
+                val dateSent =
+                    Instant.ofEpochMilli(it.getLong(it.getColumnIndexOrThrow(Telephony.Sms.DATE_SENT)))
+                        .toString()
+                val type = it.getString(it.getColumnIndexOrThrow(Telephony.Sms.TYPE))
+
+                smsList.add(Message(id, number, body, dateReceived, dateSent, type))
+            }
+        }
+        return smsList
+    }
+
+    private fun convertSmsResultCode(resultCode: Int): Pair<HttpStatusCode, String> {
+        return when (resultCode) {
+            Activity.RESULT_OK -> Pair(HttpStatusCode.OK, "Transmission successful")
+            SmsManager.RESULT_ERROR_GENERIC_FAILURE -> Pair(
+                HttpStatusCode.InternalServerError,
+                "Transmission failed"
+            )
+            SmsManager.RESULT_ERROR_RADIO_OFF -> Pair(
+                HttpStatusCode.InternalServerError,
+                "Radio off"
+            )
+            SmsManager.RESULT_ERROR_NULL_PDU -> Pair(
+                HttpStatusCode.InternalServerError,
+                "No PDU defined"
+            )
+            SmsManager.RESULT_ERROR_NO_SERVICE -> Pair(
+                HttpStatusCode.InternalServerError,
+                "No service"
+            )
+            SmsManager.RESULT_ERROR_LIMIT_EXCEEDED -> Pair(
+                HttpStatusCode.InternalServerError,
+                "Failed because we reached the sending queue limit"
+            )
+            SmsManager.RESULT_ERROR_SHORT_CODE_NOT_ALLOWED -> Pair(
+                HttpStatusCode.InternalServerError,
+                "Failed because user denied the sending of this short code"
+            )
+            SmsManager.RESULT_ERROR_SHORT_CODE_NEVER_ALLOWED -> Pair(
+                HttpStatusCode.InternalServerError,
+                "Failed because the user has denied this app ever send premium short codes"
+            )
+            else -> Pair(
+                HttpStatusCode.InternalServerError,
+                "Error"
+            )
+        }
+    }
+
+    @Throws(SQLiteCantOpenDatabaseException::class, IllegalArgumentException::class, SQLiteException::class)
+    fun getNextBatch(): Long {
+        val cursor = contentResolver.query(
+            inboxURI,
+            messageProjection,
+            Telephony.Sms._ID,
+            null,
+            Telephony.Sms._ID + " DESC"
+        )
+            ?: throw (SQLiteCantOpenDatabaseException("Provider's table not found"))
+        if (cursor.moveToFirst()){
+            cursor.use {
+                return it.getLong(cursor.getColumnIndexOrThrow(Telephony.Sms._ID))
+            }
+        }
+        return 0
+    }
+
+    @Throws(SQLiteException::class)
+    private fun putSentMessageToDatabase(
+        recipientPhoneNumber: String,
+        message: String,
+    ) {
+        val contentValues = ContentValues()
+        contentValues.put(Telephony.Sms.BODY, message)
+        contentValues.put(Telephony.Sms.ADDRESS, recipientPhoneNumber)
+        contentValues.put(Telephony.Sms.DATE_SENT, Calendar.getInstance().timeInMillis.toString())
+        contentValues.put(Telephony.Sms.TYPE, Telephony.Sms.MESSAGE_TYPE_SENT)
+        if (contentResolver.insert(allURI, contentValues) == null) {
+                throw SQLiteException("The message could not be saved")
+            }
+        Log.i(logTag, "Message has been stored successfully")
+    }
+
+
+    fun deleteInboxMessagesOlderThan(time: Long){
+        applicationContext.contentResolver.delete(allURI, Telephony.Sms.DATE +" < "+ time, null)
+    }
+}

app/src/main/java/net/folivo/android/smsGatewayServer/MmsReceiver.kt

@@ -0,0 +1,10 @@
+package net.folivo.android.smsGatewayServer
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+
+class MmsReceiver : BroadcastReceiver() {
+    override fun onReceive(p0: Context?, p1: Intent?) {
+    }
+}

app/src/main/java/net/folivo/android/smsGatewayServer/RestApiWorker.kt

@@ -0,0 +1,326 @@
+package net.folivo.android.smsGatewayServer
+
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.content.ContentResolver
+import android.content.Context
+import android.database.Cursor
+import android.net.Uri
+import android.provider.OpenableColumns
+import android.util.Log
+import androidx.core.app.NotificationCompat
+import androidx.core.text.isDigitsOnly
+import androidx.work.CoroutineWorker
+import androidx.work.ForegroundInfo
+import androidx.work.WorkerParameters
+import io.ktor.application.*
+import io.ktor.auth.*
+import io.ktor.features.*
+import io.ktor.gson.*
+import io.ktor.http.*
+import io.ktor.request.*
+import io.ktor.response.*
+import io.ktor.routing.*
+import io.ktor.server.engine.*
+import io.ktor.server.netty.*
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.delay
+import java.io.FileInputStream
+import java.io.FileNotFoundException
+import java.io.IOException
+import java.lang.IllegalStateException
+import java.lang.IndexOutOfBoundsException
+import java.security.KeyStore
+import java.security.KeyStoreException
+import java.security.NoSuchAlgorithmException
+import java.security.cert.CertificateException
+import java.util.concurrent.CancellationException
+import java.util.concurrent.TimeUnit
+import kotlin.IllegalArgumentException
+import kotlin.time.Duration
+import kotlin.time.ExperimentalTime
+
+class RestApiWorker(appContext: Context, workerParams: WorkerParameters) :
+    CoroutineWorker(appContext, workerParams) {
+
+
+    private val notificationManager =
+        appContext.getSystemService(Context.NOTIFICATION_SERVICE) as
+                NotificationManager
+
+    private val messageManager = MessageManager(applicationContext)
+    private val logTag = RestApiWorker::class.java.simpleName
+
+
+    data class SmsMessageRequestContent(val recipientPhoneNumber: String, val message: String)
+
+
+    @ExperimentalTime
+    override suspend fun doWork(): Result = coroutineScope {
+
+
+        setForegroundAsync(createForegroundInfo("Server started"))
+
+
+        val password = inputData.getString("password")
+            .orEmpty()
+        val username = inputData.getString("username")
+            .orEmpty()
+        val keyStorePassword = inputData.getString("keyStorePassword")
+            .orEmpty()
+        val certificateUri = Uri.parse(
+            inputData.getString("certificateUriStr")
+                .orEmpty()
+        )
+
+        val certificateFileNameWithoutExtension: String
+        val keyStore: KeyStore
+        val appVersion: String = BuildConfig.VERSION_NAME
+
+        try {
+            certificateFileNameWithoutExtension =
+                getKeyStoreFileName(applicationContext.contentResolver, certificateUri)
+            keyStore =
+                loadKeyStore(applicationContext.contentResolver, certificateUri, keyStorePassword)
+        } catch (exception: java.lang.Exception) {
+            Log.w(logTag, exception.toString())
+            return@coroutineScope Result.failure()
+        }
+
+
+        try {
+            val server = embeddedServer(
+                Netty,
+                applicationEngineEnvironment {
+
+                    sslConnector(
+                        keyStore = keyStore,
+                        keyAlias = certificateFileNameWithoutExtension,
+                        keyStorePassword = {
+                            keyStorePassword.toCharArray()
+                        },
+                        privateKeyPassword = { "".toCharArray() }) {
+                        host = "0.0.0.0"
+                        port = 9090
+                    }
+
+//                    connector {
+//                        host = "0.0.0.0"
+//                        port = 8080
+//                    }
+
+                    module {
+
+                        install(CallLogging)
+                        install(Authentication) {
+                            basic {
+                                realm = "Ktor Server"
+                                validate { credentials ->
+                                    if (credentials.password == password && credentials.name == username
+                                    )
+                                        UserIdPrincipal(credentials.name) else null
+                                }
+                            }
+                        }
+                        install(ContentNegotiation) {
+                            gson {
+//                                setPrettyPrinting()
+                            }
+                        }
+                        routing {
+                            authenticate {
+                                post("/messages/out") {
+                                    val result: Pair<HttpStatusCode, String>
+
+                                    try {
+                                        val smsMessage = call.receive<SmsMessageRequestContent>()
+
+                                        result = messageManager.sendSms(
+                                            smsMessage.recipientPhoneNumber,
+                                            smsMessage.message
+                                        )
+                                    } catch (exception: java.lang.Exception) {
+                                        Log.i(logTag, exception.toString())
+                                        call.respondText(
+                                            exception.toString(),
+                                            status = HttpStatusCode.BadRequest
+                                        )
+                                        return@post
+                                    }
+                                    call.respond(result)
+                                }
+                                get("/") {
+                                    call.respondText { "android sms gateway server ($appVersion) is running" }
+                                }
+                                route("/messages/in") {
+                                    optionalParam("after") {
+                                        get {
+
+                                            val requestId = call.request.queryParameters["after"]
+                                            val smsList: ArrayList<Message>
+                                            val nextBatch: Long
+
+
+                                            if (requestId.isNullOrEmpty()) {
+
+                                                try {
+                                                    smsList =
+                                                        messageManager.getInboxMessages()
+                                                    nextBatch = messageManager.getNextBatch()
+                                                } catch (e: Exception) {
+                                                    Log.w(logTag, e.stackTraceToString())
+                                                    call.respondText(
+                                                        e.toString(),
+                                                        status = HttpStatusCode.InternalServerError
+                                                    )
+                                                    return@get
+                                                }
+                                                call.respond(
+                                                    hashMapOf(
+                                                        "messages" to smsList,
+                                                        "nextBatch" to nextBatch
+                                                    )
+                                                )
+                                                return@get
+                                            }
+                                            if (requestId.isDigitsOnly()) {
+
+                                                try {
+                                                    smsList =
+                                                        messageManager.getInboxMessagesFromIdUp(
+
+                                                            requestId
+                                                        )
+                                                    nextBatch = messageManager.getNextBatch()
+
+                                                } catch (e: Exception) {
+                                                    Log.w(logTag, e.stackTraceToString())
+                                                    call.respondText(
+                                                        e.toString(),
+                                                        status = HttpStatusCode.InternalServerError
+                                                    )
+                                                    return@get
+                                                }
+
+                                                call.respond(
+                                                    hashMapOf(
+                                                        "messages" to smsList,
+                                                        "nextBatch" to nextBatch
+                                                    )
+                                                )
+
+                                            } else {
+                                                call.respondText(
+                                                    "ID must be of type long and positive!",
+                                                    status = HttpStatusCode.BadRequest
+                                                )
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+
+                })
+            server.start()
+            try {
+                delay(Duration.INFINITE)
+            } finally {
+                server.stop(0, 10, TimeUnit.MILLISECONDS)
+            }
+        } catch (exception: java.lang.Exception) {
+            if (exception !is CancellationException) {
+                Log.w(logTag, exception.toString())
+                return@coroutineScope Result.failure()
+            }
+        }
+        Result.success()
+    }
+
+
+    private fun createForegroundInfo(progress: String): ForegroundInfo {
+
+        notificationManager.createNotificationChannel(
+            NotificationChannel(
+                "default",
+                "Default",
+                NotificationManager.IMPORTANCE_HIGH
+            )
+        )
+
+        val notification = NotificationCompat.Builder(applicationContext, "default")
+            .setContentTitle("Server started")
+            .setTicker("Running in background")
+            .setContentText(progress)
+            .setSmallIcon(R.drawable.ic_launcher_foreground)
+            .setOngoing(true)
+            .build()
+
+        return ForegroundInfo(1, notification)
+    }
+
+
+    companion object {
+
+        @Throws(
+            IndexOutOfBoundsException::class,
+            IllegalArgumentException::class,
+            KeyStoreException::class,
+            IllegalStateException::class
+        )
+        fun getKeyStoreFileName(contentResolver: ContentResolver, uri: Uri): String {
+
+            var fileName: String? = null
+            if (uri.scheme == "content") {
+                val cursor: Cursor? = contentResolver.query(uri, null, null, null, null)
+                cursor?.use {
+                    if (it.moveToFirst()) {
+                        fileName =
+                            it.getString(it.getColumnIndexOrThrow(OpenableColumns.DISPLAY_NAME))
+                    }
+                }
+            } else {
+                val uriPath = uri.path
+                fileName = uriPath?.substring(uriPath.lastIndexOf("/") + 1)
+            }
+
+            if (fileName.isNullOrBlank()) {
+                throw KeyStoreException("The KeyStore file name could not be extracted.")
+            }
+
+            return fileName?.lastIndexOf('.')?.let { fileName?.substring(0, it) }
+                ?: throw KeyStoreException("The KeyStore file name could not be extracted")
+        }
+
+
+        @Throws(
+            KeyStoreException::class,
+            FileNotFoundException::class,
+            IOException::class,
+            NoSuchAlgorithmException::class,
+            CertificateException::class
+        )
+        fun loadKeyStore(
+            contentResolver: ContentResolver,
+            uri: Uri,
+            keyStorePassword: String
+        ): KeyStore {
+
+            val keyStore = KeyStore.getInstance("pkcs12")
+            if (uri.scheme == "content") {
+                contentResolver.openInputStream(uri)?.use { inputStream ->
+                    keyStore.load(inputStream, keyStorePassword.toCharArray())
+                }
+            } else {
+                keyStore.load(
+                    FileInputStream(uri.path),
+                    keyStorePassword.toCharArray()
+                )
+            }
+            return keyStore
+        }
+    }
+
+
+}

app/src/main/java/net/folivo/android/smsGatewayServer/SmsReceiver.kt

@@ -0,0 +1,35 @@
+package net.folivo.android.smsGatewayServer
+
+import android.content.BroadcastReceiver
+import android.content.ContentValues
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import android.provider.Telephony
+import java.util.*
+
+class SmsReceiver : BroadcastReceiver() {
+
+    override fun onReceive(context: Context?, intent: Intent?) {
+        // Get SMS map from Intent
+        if (context == null || intent == null || intent.action == null) {
+            return
+        }
+
+        val smsMessages = Telephony.Sms.Intents.getMessagesFromIntent(intent)
+        val body = smsMessages.joinToString(separator = "") { it.displayMessageBody }
+
+        putSmsToDatabase(context, body, smsMessages.first().displayOriginatingAddress)
+    }
+
+    private fun putSmsToDatabase(context: Context, body: String, address: String): Uri? {
+        val contentResolver = context.contentResolver
+        val contentValues = ContentValues()
+        contentValues.put(Telephony.Sms.BODY, body)
+        contentValues.put(Telephony.Sms.DATE, Calendar.getInstance().timeInMillis.toString())
+        contentValues.put(Telephony.Sms.ADDRESS, address)
+        contentValues.put(Telephony.Sms.TYPE, Telephony.Sms.MESSAGE_TYPE_INBOX)
+        return contentResolver.insert(Telephony.Sms.CONTENT_URI, contentValues)
+    }
+
+}

app/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

app/src/main/res/drawable/border.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
+    <solid android:color="@color/design_default_color_background" />
+    <stroke android:width="1dp" android:color="@android:color/darker_gray" />
+</shape>

app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

app/src/main/res/layout/activity_main.xml

@@ -0,0 +1,190 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/constraintLayout"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_gravity="center"
+    android:baselineAligned="false"
+    android:gravity="center|fill_vertical"
+    tools:context="net.folivo.android.smsGatewayServer.MainActivity">
+
+    <LinearLayout
+        android:id="@+id/linLayoutServerOptions"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginTop="4dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginBottom="4dp"
+        android:background="@drawable/border"
+        android:backgroundTintMode="src_atop"
+        android:baselineAligned="false"
+        android:gravity="center"
+        android:orientation="vertical"
+        android:padding="10dp"
+        app:layout_constraintBottom_toTopOf="@+id/linLayoutCertificateOptions"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <androidx.appcompat.widget.SwitchCompat
+            android:id="@+id/switchStartServer"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/btn_start_server" />
+
+        <LinearLayout
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:baselineAligned="true"
+            android:gravity="center">
+
+            <TextView
+                android:id="@+id/txtViewUsername"
+                android:layout_width="150dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="2"
+                android:labelFor="@id/editTextUserName"
+                android:text="@string/txtView_username" />
+
+            <EditText
+                android:id="@+id/editTextUserName"
+                android:layout_width="200dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="3"
+                android:autofillHints="username"
+                android:ems="10"
+                android:hint="@string/editTextUserName_hint"
+                android:inputType="textPersonName" />
+        </LinearLayout>
+
+        <LinearLayout
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:gravity="center">
+
+            <TextView
+                android:id="@+id/textViewPassword"
+                android:layout_width="150dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="2"
+                android:labelFor="@id/editTextPassword"
+                android:text="@string/txtView_access_password" />
+
+            <EditText
+                android:id="@+id/editTextPassword"
+                android:layout_width="200dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="3"
+                android:autofillHints="password"
+                android:ems="10"
+                android:hint="@string/editTextPasswort_hint"
+                android:inputType="textPassword" />
+        </LinearLayout>
+
+    </LinearLayout>
+
+    <LinearLayout
+        android:id="@+id/linLayoutCertificateOptions"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginBottom="4dp"
+        android:background="@drawable/border"
+        android:gravity="center"
+        android:orientation="vertical"
+        android:padding="10dp"
+        app:layout_constraintBottom_toTopOf="@id/linLayoutDeleteMessagesOptions"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/linLayoutServerOptions">
+
+        <LinearLayout
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:gravity="center">
+
+            <TextView
+                android:id="@+id/textViewPathKeyStore"
+                android:layout_width="150dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="2"
+                android:labelFor="@id/editTextPathKeyStore"
+                android:text="@string/txtView_keystore_path" />
+
+            <EditText
+                android:id="@+id/editTextPathKeyStore"
+                android:layout_width="144dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="3"
+                android:autofillHints=""
+                android:ems="10"
+                android:inputType="textUri" />
+
+            <ImageButton
+                android:id="@+id/buttonCertificate"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_weight="2"
+                android:contentDescription="@string/btn_certificate_content_Description"
+                app:srcCompat="?android:attr/actionModeFindDrawable" />
+
+        </LinearLayout>
+
+        <LinearLayout
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:gravity="center">
+
+            <TextView
+                android:id="@+id/textViewKeyStorePassword"
+                android:layout_width="150dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="2"
+                android:labelFor="@id/editTextKeyStorePassword"
+                android:text="@string/txtView_keystore_password" />
+
+            <EditText
+                android:id="@+id/editTextKeyStorePassword"
+                android:layout_width="200dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="3"
+                android:autofillHints=""
+                android:ems="10"
+                android:inputType="textPassword" />
+
+        </LinearLayout>
+
+        <Button
+            android:id="@+id/buttonCheckCertificateAvailability"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/btn_check_certificate" />
+
+    </LinearLayout>
+
+    <LinearLayout
+        android:id="@+id/linLayoutDeleteMessagesOptions"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginBottom="4dp"
+        android:gravity="center"
+        android:orientation="vertical"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/linLayoutCertificateOptions">
+
+        <Button
+            android:id="@+id/buttonDeleteMessages"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/btn_delete_messages" />
+    </LinearLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/values-de/strings.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">SMSService</string>
+
+    <string name="btn_check_certificate">Überprüfe Zertifikatverfügbarkeit</string>
+    <string name="btn_start_server">Server starten</string>
+    <string name="btn_delete_messages">Lösche Nachrichten\n(älter als 2 Wochen)</string>
+    <string name="txtView_keystore_password">Keystore Passwort</string>
+    <string name="txtView_access_password">Zugangspasswort</string>
+    <string name="txtView_username">Benutzername</string>
+    <string name="txtView_keystore_path">Keystore Pfad</string>
+
+    <string name="toast_server_terminated_successfully">Der Server wurde erfolgreich gestoppt</string>
+    <string name="toast_server_terminated_failed">Der Server wurde aufgrund eines Fehlers gestoppt</string>
+    <string name="btn_certificate_content_Description">Wähle Keystore mit der Systemauswahl</string>
+
+</resources>

app/src/main/res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#6200EE</color>
+    <color name="colorPrimaryDark">#3700B3</color>
+    <color name="colorAccent">#03DAC5</color>
+</resources>

app/src/main/res/values/strings.xml

@@ -0,0 +1,24 @@
+<resources>
+    <string name="app_name">SMSService</string>
+
+    <string name="btn_check_certificate">Check certificate availability</string>
+    <string name="btn_start_server">Start Server</string>
+    <string name="btn_delete_messages">Delete Messages\n(older than 2 Weeks)</string>
+    <string name="txtView_keystore_password">Keystore Password</string>
+    <string name="txtView_access_password">Access Password</string>
+    <string name="txtView_username">Username</string>
+    <string name="txtView_keystore_path">Keystore Path</string>
+    <string name="toast_server_terminated_successfully">Server terminated successfully</string>
+    <string name="toast_server_terminated_failed">Server was stopped due a major error</string>
+
+
+    <string name="saved_username_key" translatable="false">username</string>
+    <string name="saved_password_key" translatable="false">password</string>
+    <string name="saved_keyStore_password_key" translatable="false">keyStorePassword</string>
+    <string name="saved_certificate_uri_str_key" translatable="false">certificateUriStr</string>
+    <string name="btn_certificate_content_Description">Select Keystore with system picker</string>
+    <string name="editTextPasswort_hint" translatable="false">123</string>
+    <string name="editTextUserName_hint" translatable="false">admin</string>
+
+
+</resources>

app/src/main/res/values/styles.xml

@@ -0,0 +1,10 @@
+<resources>
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+
+</resources>

app/src/test/java/net/folivo/android/smsGatewayServer/KotestConfig.kt

@@ -0,0 +1,9 @@
+package net.folivo.android.smsGatewayServer
+
+import io.kotest.core.config.AbstractProjectConfig
+import io.kotest.core.extensions.Extension
+import io.kotest.experimental.robolectric.RobolectricExtension
+
+class KotestConfig : AbstractProjectConfig() {
+    override fun extensions(): List<Extension> = super.extensions() + RobolectricExtension()
+}

app/src/test/java/net/folivo/android/smsGatewayServer/MessageManagerTest.kt

@@ -0,0 +1,185 @@
+package net.folivo.android.smsGatewayServer
+
+import android.app.Activity
+import android.content.ContentResolver
+import android.content.Context
+import android.database.MatrixCursor
+import android.provider.Telephony
+import android.telephony.SmsManager
+import androidx.test.core.app.ApplicationProvider
+import io.kotest.matchers.shouldBe
+import io.ktor.http.*
+import io.mockk.every
+import io.mockk.mockk
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.Shadows.shadowOf
+
+
+@RunWith(RobolectricTestRunner::class)
+class MessageManagerTest {
+
+//    @Test
+//    fun `when here are multiple sms messages it should get last id from inbox messages`() {
+//        val contentResolverMock = mockk<ContentResolver>()
+//        val contextMock = mockk<Context> {
+//            every { contentResolver } returns contentResolverMock
+//        }
+//        val cut = MessageManager(contextMock)
+//
+//        val matrixCursor = MatrixCursor(arrayOf(Telephony.Sms._ID))
+//        matrixCursor.addRow(arrayOf(4))
+//        matrixCursor.addRow(arrayOf(2))
+//        every {
+//            contentResolverMock.query(
+//                Telephony.Sms.Inbox.CONTENT_URI,
+//                null,
+//                Telephony.Sms._ID,
+//                null,
+//                Telephony.Sms._ID + " DESC"
+//            )
+//        } returns matrixCursor
+//        cut.getNextBatch().shouldBe(4)
+//    }
+//
+//    @Test
+//    fun `when here are no sms messages it should return 0`() {
+//        val contentResolverMock = mockk<ContentResolver>()
+//        val contextMock = mockk<Context> {
+//            every { contentResolver } returns contentResolverMock
+//        }
+//        val cut = MessageManager(contextMock)
+//
+//        val matrixCursor = MatrixCursor(arrayOf(Telephony.Sms._ID))
+//        every {
+//            contentResolverMock.query(
+//                Telephony.Sms.Inbox.CONTENT_URI,
+//                null,
+//                Telephony.Sms._ID,
+//                null,
+//                Telephony.Sms._ID + " DESC"
+//            )
+//        } returns matrixCursor
+//        cut.getNextBatch().shouldBe(0)
+//    }
+//
+//    @Test
+//    fun `when there is one simple text message to sent it should send simple text message"`() {
+//        val context = ApplicationProvider.getApplicationContext<Context>()
+//
+//        val cut = MessageManager(context)
+//        runBlocking {
+//            launch {
+//                println("sendSms")
+//                cut.sendSms("012345678", "Dies ist eine einfache Textnachricht.")
+//                    .shouldBe(Pair(HttpStatusCode.OK, "Transmission successful"))
+//                println("send fertig")
+//            }
+//            launch {
+//                var smsManager = SmsManager.getDefault()
+//                var shadowSmsManager = shadowOf(smsManager)
+//                println("loop")
+//                while (true) {
+//                    val lastSentTextMessageParams = shadowSmsManager.lastSentTextMessageParams
+//                    if (lastSentTextMessageParams != null) {
+//
+//                        lastSentTextMessageParams.sentIntent.send(Activity.RESULT_OK)
+//                        lastSentTextMessageParams.destinationAddress.shouldBe("012345678")
+//                        lastSentTextMessageParams.text.shouldBe("Dies ist eine einfache Textnachricht.")
+//
+//                        break
+//                    }
+//                    delay(100)
+//                }
+//                println("fertig")
+//            }
+//        }
+//        println("end")
+//    }
+//
+//    @Test
+//    fun `where there is one multiple text message to sent it should send multiple text message`() {
+//        val context = ApplicationProvider.getApplicationContext<Context>()
+//        val cut = MessageManager(context)
+//        var smsManager = SmsManager.getDefault()
+//        var shadowSmsManager = shadowOf(smsManager)
+//        GlobalScope.launch {
+//            cut.sendSms(
+//                "012345678",
+//                "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. " +
+//                        "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. " +
+//                        "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. " +
+//                        "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. " +
+//                        "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht."
+//            )
+//        }
+//        val lastSentTextMessageParams =
+//            shadowSmsManager.lastSentMultipartTextMessageParams
+//        lastSentTextMessageParams.destinationAddress.shouldBe("012345678")
+//        lastSentTextMessageParams.parts.shouldBe(listOf(
+//            "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies",
+//            " ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies ist",
+//            " eine Multipart Textnachricht."
+//        ))
+//    }
+
+}
+
+//private fun testBody(): DescribeSpec.() -> Unit {
+//    return {
+//
+//        describe(MessageManager::sendSms.name) {
+//
+//            val context = ApplicationProvider.getApplicationContext<Context>()
+//            val cut = MessageManager(context)
+//            describe("there is one simple text message to sent") {
+//                var smsManager = SmsManager.getDefault()
+//                smsManager.sendTextMessage("1234", null, "jklösldkjfösd", null, null)
+//                var shadowSmsManager = shadowOf(smsManager)
+//
+//                it("should send simple text message") {
+//                    GlobalScope.launch {
+//                        cut.sendSms("012345678", "Dies ist eine einfache Textnachricht.")
+//                    }
+//                    delay(500)
+//                    val lastSentTextMessageParams = shadowSmsManager.lastSentTextMessageParams
+//                    lastSentTextMessageParams.sentIntent.send(context,
+//                        Activity.RESULT_OK,
+//                        Intent("sent"))
+//                    lastSentTextMessageParams.destinationAddress.shouldBe("012345678")
+//                    lastSentTextMessageParams.text.shouldBe("Dies ist eine einfache Textnachricht.")
+//                }
+//
+//            }
+//            describe("there are is multiple text message to sent") {
+//                it("should send multiple text message") {
+//                    cut.sendSms(
+//                        "012345678",
+//                        "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. " +
+//                                "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. " +
+//                                "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. " +
+//                                "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. " +
+//                                "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht."
+//                    )
+//                    val shadowSmsManager = ShadowSmsManager()
+//                    val lastSentTextMessageParams =
+//                        shadowSmsManager.lastSentMultipartTextMessageParams
+//                    lastSentTextMessageParams.destinationAddress.shouldBe("012345678")
+//                    lastSentTextMessageParams.parts.shouldBe(listOf(
+//                        "Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies",
+//                        " ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies ist eine Multipart Textnachricht. Dies ist",
+//                        " eine Multipart Textnachricht."
+//                    ))
+//                }
+//
+//            }
+//
+//        }
+//
+//    }
+//}

app/src/test/java/net/folivo/android/smsGatewayServer/RestApiWorkerTest.kt

@@ -0,0 +1,90 @@
+package net.folivo.android.smsGatewayServer
+
+import android.content.ContentResolver
+import android.database.MatrixCursor
+import android.net.Uri
+import android.provider.OpenableColumns
+import io.kotest.matchers.shouldBe
+import io.mockk.every
+import io.mockk.mockk
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import java.security.KeyStoreException
+
+@RunWith(RobolectricTestRunner::class)
+class RestApiWorkerTest {
+
+    //getKeyStoreFileName
+    @Test
+    fun `when there is a file path starts with "content" and includes not the file name, it should get the name`() {
+        val testUri = Uri.parse("content://com.android.providers.downloads.documents/document/msf%3A1035")
+        val contentResolverMock = mockk<ContentResolver>()
+        val matrixCursor = MatrixCursor(arrayOf(OpenableColumns.DISPLAY_NAME))
+        matrixCursor.addRow(arrayOf("certificate.p12"))
+        every {
+            contentResolverMock.query(
+                testUri,
+                null,
+                null,
+                null,
+                null
+            )
+        } returns matrixCursor
+        RestApiWorker.getKeyStoreFileName(contentResolverMock, testUri).shouldBe("certificate")
+    }
+
+    @Test
+    fun `when there is a file path starts with "content" and includes the file name, it should get the name`() {
+        val testUri = Uri.parse("content://com.android.providers.downloads.documents/document/certificate.p12")
+        val contentResolverMock = mockk<ContentResolver>()
+        val matrixCursor = MatrixCursor(arrayOf(OpenableColumns.DISPLAY_NAME))
+        matrixCursor.addRow(arrayOf("certificate.p12"))
+        every {
+            contentResolverMock.query(
+                testUri,
+                null,
+                null,
+                null,
+                null
+            )
+        } returns matrixCursor
+        RestApiWorker.getKeyStoreFileName(contentResolverMock, testUri).shouldBe("certificate")
+    }
+
+    @Test
+    fun `when there is a file path starts not with "content" and includes the file name, it should get the name`() {
+        val testUri = Uri.parse("/storage/emulated/0/Download/certificate.p12")
+        val contentResolverMock = mockk<ContentResolver>()
+        val matrixCursor = MatrixCursor(arrayOf(OpenableColumns.DISPLAY_NAME))
+        matrixCursor.addRow(arrayOf("certificate.p12"))
+        every {
+            contentResolverMock.query(
+                testUri,
+                null,
+                null,
+                null,
+                null
+            )
+        } returns matrixCursor
+        RestApiWorker.getKeyStoreFileName(contentResolverMock, testUri).shouldBe("certificate")
+    }
+
+
+    @Test(expected = KeyStoreException::class)
+    fun `when there is an empty file path, it should throw a KeyStoreException`(){
+        val testUri = Uri.parse("")
+        val contentResolverMock = mockk<ContentResolver>()
+        every {
+            contentResolverMock.query(
+                testUri,
+                null,
+                null,
+                null,
+                null
+            )
+        } returns null
+        RestApiWorker.getKeyStoreFileName(contentResolverMock, testUri)
+    }
+
+}

app/src/test/java/net/folivo/android/smsGatewayServer/TestApplication.kt

@@ -0,0 +1,5 @@
+package net.folivo.android.smsGatewayServer
+
+import android.app.Application
+
+class TestApplication : Application()

build.gradle

@@ -0,0 +1,27 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+    ext.kotlin_version = "1.4.10"
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:4.1.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.10"
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

gradle.properties

@@ -0,0 +1,21 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Tue Oct 13 15:18:31 CEST 2020
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip

gradlew

@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1,2 @@
+include ':app'
+rootProject.name = "androidSmsGatewayServer"