Enable for Kotlin Gradle dsl. (#4392)

* Enable for Kotlin Gradle dsl.

Additionally migrate to using a version catalog to simplify dependency
management.

* Fix metalava

* Address review comments

Author: vkryachko

build.gradle

@@ -16,8 +16,9 @@ import com.google.firebase.gradle.plugins.license.LicenseResolverPlugin
 import com.google.firebase.gradle.MultiProjectReleasePlugin
 
 buildscript {
-    ext.kotlinVersion = '1.7.10'
-    ext.coroutinesVersion = '1.6.4'
+    // TODO: remove once all sdks have migrated to version catalog
+    ext.kotlinVersion = libs.versions.kotlin.get()
+    ext.coroutinesVersion = libs.versions.coroutines.get()
 
     repositories {
         google()
@@ -47,13 +48,12 @@ apply from: 'sdkProperties.gradle'
 apply from: "gradle/errorProne.gradle"
 
 ext {
-    playServicesVersion = '16.0.1'
-    supportAnnotationsVersion = '28.0.0'
-    googleTruthVersion = '1.1.2'
-    grpcVersion = '1.50.2'
-    robolectricVersion = '4.9'
-    protocVersion = '3.17.3'
-    javaliteVersion = '3.17.3'
+    // TODO: remove once all sdks have migrated to version catalog
+    googleTruthVersion = libs.versions.truth.get()
+    grpcVersion = libs.versions.grpc.get()
+    robolectricVersion = libs.versions.robolectric.get()
+    protocVersion = libs.versions.protoc.get()
+    javaliteVersion = libs.versions.javalite.get()
 }
 
 apply plugin: com.google.firebase.gradle.plugins.publish.PublishingPlugin

firebase-common/ktx/ktx.gradle

@@ -0,0 +1,60 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+plugins {
+    id("firebase-library")
+    id("kotlin-android")
+}
+
+firebaseLibrary {
+    releaseWith(project(":firebase-common"))
+}
+
+android {
+    val targetSdkVersion : Int by rootProject
+    val minSdkVersion : Int by rootProject
+    compileSdk = targetSdkVersion
+    defaultConfig {
+        minSdk = minSdkVersion
+        targetSdk = targetSdkVersion
+    }
+    sourceSets {
+        getByName("main") {
+            java.srcDirs("src/main/kotlin")
+        }
+        getByName("test") {
+            java.srcDirs("src/test/kotlin")
+        }
+    }
+    testOptions.unitTests.isIncludeAndroidResources = true
+}
+
+dependencies {
+    implementation(libs.kotlin.stdlib)
+
+    implementation(project(":firebase-annotations"))
+    implementation(project(":firebase-common"))
+    implementation(project(":firebase-components"))
+    implementation(libs.androidx.annotation)
+
+    // We"re exposing this library as a transitive dependency so developers can
+    // get Kotlin Coroutines support out-of-the-box for methods that return a Task
+    api(libs.kotlin.coroutines.tasks)
+
+    testImplementation(libs.robolectric)
+    testImplementation(libs.junit)
+    testImplementation(libs.truth)
+    testImplementation(libs.androidx.test.core)
+    testImplementation(libs.kotlin.coroutines.test)
+}

firebase-common/ktx/ktx.gradle.kts

@@ -0,0 +1,20 @@
+[versions]
+coroutines = "1.6.4"
+grpc = "1.50.2"
+javalite = "3.17.3"
+kotlin = "1.7.10"
+protoc = "3.17.3"
+robolectric = "4.9"
+truth = "1.1.2"
+
+[libraries]
+androidx-annotation = { module = "androidx.annotation:annotation", version = "1.5.0" }
+kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib", version.ref = "kotlin" }
+kotlin-coroutines-tasks = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-play-services", version.ref = "coroutines" }
+
+# Test libs
+androidx-test-core = { module = "androidx.test:core", version = "1.5.0" }
+junit = { module = "junit:junit", version = "4.13.2" }
+kotlin-coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test", version.ref = "coroutines" }
+robolectric = {module = "org.robolectric:robolectric", version.ref = "robolectric" }
+truth = { module = "com.google.truth:truth", version.ref = "truth"}

gradle/libs.versions.toml

@@ -29,7 +29,9 @@ ext {
 
   /** Recursively renames build scripts to ${project.name}.gradle. */
   renameBuildScripts = {ProjectDescriptor project ->
-    project.buildFileName = project.parent ? "${project.name}.gradle" : 'build.gradle'
+    def ktsFile = "${project.name}.gradle.kts"
+    def projectFile = new File(project.projectDir, ktsFile).exists() ? ktsFile : "${project.name}.gradle"
+    project.buildFileName = project.parent ? projectFile : 'build.gradle'
 
     project.children.each {
       renameBuildScripts(it)

gradle/projectSettings.gradle

@@ -14,6 +14,8 @@
 
 rootProject.name = 'com.google.firebase'
 
+enableFeaturePreview("VERSION_CATALOGS")
+
 //Note: do not add subprojects to this file. Instead add them to subprojects.gradle
 
 apply from: 'gradle/projectSettings.gradle'