fix(android): compatibility with cordova kotlin plugins

cli/src/android/update.ts

@@ -293,6 +293,13 @@ export async function handleCordovaPluginsGradle(
     config.android.cordovaPluginsDirAbs,
     'build.gradle',
   );
+  const kotlinNeeded = await kotlinNeededCheck(config, cordovaPlugins);
+  const isKotlinVersionInVariablesGradle = (
+    await getVariablesGradleFile(config)
+  ).includes('kotlin_version');
+  const kotlinVersionString =
+    config.app.extConfig.cordova?.preferences?.GradlePluginKotlinVersion ??
+    '1.4.32';
   const frameworksArray: any[] = [];
   let prefsArray: any[] = [];
   const applyArray: any[] = [];
@@ -328,6 +335,10 @@ export async function handleCordovaPluginsGradle(
     prefsArray,
     frameworkString,
   );
+  if (kotlinNeeded) {
+    frameworkString += `\n    implementation "androidx.core:core-ktx:$androidxCoreKTXVersion"`;
+    frameworkString += `\n    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"`;
+  }
   const applyString = applyArray.join('\n');
   let buildGradle = await readFile(pluginsGradlePath, { encoding: 'utf-8' });
   buildGradle = buildGradle.replace(
@@ -338,6 +349,28 @@ export async function handleCordovaPluginsGradle(
     /(PLUGIN GRADLE EXTENSIONS START)[\s\S]*(\/\/ PLUGIN GRADLE EXTENSIONS END)/,
     '$1\n' + applyString.concat('\n') + '$2',
   );
+  if (kotlinNeeded) {
+    buildGradle = buildGradle.replace(
+      /(buildscript\s{\n(\t|\s{4})repositories\s{\n((\t{2}|\s{8}).+\n)+(\t|\s{4})}\n(\t|\s{4})dependencies\s{\n(\t{2}|\s{8}).+)\n((\t|\s{4})}\n}\n)/,
+      `$1\n        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:` +
+        (isKotlinVersionInVariablesGradle
+          ? '$kotlin_version'
+          : kotlinVersionString) +
+        `"\n$8`,
+    );
+    buildGradle = buildGradle.replace(
+      /(ext\s{)/,
+      `$1\n    kotlin_version = project.hasProperty('kotlin_version') ? rootProject.ext.kotlin_version : '${kotlinVersionString}'\n    androidxCoreKTXVersion = project.hasProperty('androidxCoreKTXVersion') ? rootProject.ext.androidxCoreKTXVersion : '1.6.0'`,
+    );
+    buildGradle = buildGradle.replace(
+      /(apply\splugin:\s'com\.android\.library')/,
+      `$1\napply plugin: 'kotlin-android'`,
+    );
+    buildGradle = buildGradle.replace(
+      /(compileOptions\s{\n((\t{2}|\s{8}).+\n)+(\t|\s{4})})\n(})/,
+      `$1\n    sourceSets {\n        main.java.srcDirs += 'src/main/kotlin'\n    }\n$5`,
+    );
+  }
   await writeFile(pluginsGradlePath, buildGradle);
   const cordovaVariables = `// DO NOT EDIT THIS FILE! IT IS GENERATED EACH TIME "capacitor update" IS RUN
 ext {
@@ -352,6 +385,26 @@ ext {
   );
 }
 
+async function kotlinNeededCheck(config: Config, cordovaPlugins: Plugin[]) {
+  if (
+    config.app.extConfig.cordova?.preferences?.GradlePluginKotlinEnabled !==
+    'true'
+  ) {
+    for (const plugin of cordovaPlugins) {
+      const androidPlatform = getPluginPlatform(plugin, platform);
+      const srcFiles = androidPlatform['source-file'];
+      for (const srcFile of srcFiles) {
+        if (/^.*\.kt$/.test(srcFile['$'].src)) {
+          return true;
+        }
+      }
+    }
+    return false;
+  } else {
+    return true;
+  }
+}
+
 async function copyPluginsNativeFiles(
   config: Config,
   cordovaPlugins: Plugin[],
@@ -421,11 +474,7 @@ async function getPluginsTask(config: Config) {
   });
 }
 
-async function replaceFrameworkVariables(
-  config: Config,
-  prefsArray: any[],
-  frameworkString: string,
-) {
+async function getVariablesGradleFile(config: Config) {
   const variablesFile = resolve(
     config.android.platformDirAbs,
     'variables.gradle',
@@ -434,6 +483,15 @@ async function replaceFrameworkVariables(
   if (await pathExists(variablesFile)) {
     variablesGradle = await readFile(variablesFile, { encoding: 'utf-8' });
   }
+  return variablesGradle;
+}
+
+async function replaceFrameworkVariables(
+  config: Config,
+  prefsArray: any[],
+  frameworkString: string,
+) {
+  const variablesGradle = await getVariablesGradleFile(config);
   prefsArray.map((preference: any) => {
     if (!variablesGradle.includes(preference.$.name)) {
       frameworkString = frameworkString.replace(