Adds backend module, tests for /version and /conversations (not real tests yet)

backend/.gitignore

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+/build

backend/build.gradle

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+plugins {
+    id 'com.android.library'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    namespace 'net.buzzert.kordophone.backend'
+    compileSdk 33
+
+    defaultConfig {
+        minSdk 31
+        targetSdk 33
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles "consumer-rules.pro"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.core:core-ktx:1.8.0'
+    implementation 'androidx.appcompat:appcompat:1.4.1'
+    implementation 'com.google.android.material:material:1.5.0'
+    implementation 'androidx.core:core-ktx:+'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+
+    // Third-party
+    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
+    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
+    implementation 'com.google.code.gson:gson:2.9.0'
+
+    // https://mvnrepository.com/artifact/org.jetbrains.kotlinx/kotlinx-coroutines-core
+    implementation group: 'org.jetbrains.kotlinx', name: 'kotlinx-coroutines-core', version: '1.7.3', ext: 'pom'
+    testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.7.3'
+    testImplementation 'com.squareup.okhttp3:mockwebserver:4.9.1'
+}

backend/proguard-rules.pro

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+# 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

backend/src/androidTest/java/net/buzzert/kordophone/backend/ExampleInstrumentedTest.kt

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+package net.buzzert.kordophone.backend
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("net.buzzert.kordophone.backend.test", appContext.packageName)
+    }
+}

backend/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+<uses-permission android:name="android.permission.INTERNET" />
+</manifest>

backend/src/main/java/net/buzzert/kordophone/backend/APIClient.kt

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+package net.buzzert.kordophone.backend
+
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+import java.net.URL
+
+class APIClient(baseURL: URL) {
+    private val retrofit: Retrofit = Retrofit.Builder()
+        .baseUrl(baseURL)
+        .addConverterFactory(GsonConverterFactory.create())
+        .build()
+
+    fun getClient(): Retrofit {
+        return retrofit
+    }
+}

backend/src/main/java/net/buzzert/kordophone/backend/APIInterface.kt

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+package net.buzzert.kordophone.backend
+
+import net.buzzert.kordophone.backend.model.Conversation
+import okhttp3.ResponseBody
+import retrofit2.Call
+import retrofit2.Response
+import retrofit2.http.GET
+
+interface APIInterface {
+    @GET("/version")
+    suspend fun getVersion(): ResponseBody
+
+    @GET("/conversations")
+    suspend fun getConversations(): Response<List<Conversation>>
+}

backend/src/main/java/net/buzzert/kordophone/backend/ChatRepository.kt

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+package net.buzzert.kordophone.backend
+
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.launch
+import net.buzzert.kordophone.backend.model.Conversation
+import java.net.URL
+
+class ChatRepository(baseURL: URL) {
+    private val client: APIClient = APIClient(baseURL)
+    private val apiInterface: APIInterface = client.getClient().create(APIInterface::class.java)
+
+    suspend fun getVersion(): String {
+        return apiInterface.getVersion().string()
+    }
+
+    suspend fun fetchConversations(): List<Conversation> {
+        return apiInterface.getConversations().body()!!
+    }
+}

backend/src/main/java/net/buzzert/kordophone/backend/model/Conversation.kt

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+package net.buzzert.kordophone.backend.model
+
+import com.google.gson.annotations.SerializedName
+import java.util.Date
+
+data class Conversation(
+    @SerializedName("date")
+    val date: Date,
+
+    @SerializedName("participantDisplayNames")
+    val participants: List<String>?,
+
+    @SerializedName("displayName")
+    val displayName: String?,
+
+    @SerializedName("unreadCount")
+    val unreadCount: Int,
+
+    @SerializedName("lastMessagePreview")
+    val lastMessagePreview: String,
+
+    @SerializedName("guid")
+    val guid: String,
+)

backend/src/test/java/net/buzzert/kordophone/backend/ExampleUnitTest.kt

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+package net.buzzert.kordophone.backend
+
+import kotlinx.coroutines.runBlocking
+import org.junit.Test
+
+import org.junit.Assert.*
+import java.net.URL
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    val repository = ChatRepository(URL("http://localhost:5738"))
+
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+
+    @Test
+    fun testGetVersion() = runBlocking {
+        val version = repository.getVersion()
+        println("Version: $version")
+    }
+
+    @Test
+    fun testFetchConversations() = runBlocking {
+        val conversations = repository.fetchConversations()
+        println("Conversations: $conversations")
+    }
+}