feat: Add deep link plugin for mobile (#504)

Co-authored-by: Fabian-Lars <fabianlars@fabianlars.de>
Co-authored-by: Lucas Nogueira <lucas@tauri.app>
Co-authored-by: Lucas Nogueira <lucas@tauri.studio>

plugins/deep-link/android/.gitignore

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+/build
+/.tauri

plugins/deep-link/android/build.gradle.kts

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+plugins {
+    id("com.android.library")
+    id("org.jetbrains.kotlin.android")
+}
+
+android {
+    namespace = "app.tauri.deep_link"
+    compileSdk = 32
+
+    defaultConfig {
+        minSdk = 24
+        targetSdk = 32
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles("consumer-rules.pro")
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = 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:1.9.0")
+    implementation("androidx.appcompat:appcompat:1.6.0")
+    implementation("com.google.android.material:material:1.7.0")
+    testImplementation("junit:junit:4.13.2")
+    androidTestImplementation("androidx.test.ext:junit:1.1.5")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
+    implementation(project(":tauri-android"))
+}

plugins/deep-link/android/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

plugins/deep-link/android/settings.gradle

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+include ':tauri-android'
+project(':tauri-android').projectDir = new File('./.tauri/tauri-api')

plugins/deep-link/android/src/androidTest/java/ExampleInstrumentedTest.kt

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+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+package app.tauri.deep_link
+
+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("app.tauri.deep_link", appContext.packageName)
+    }
+}

plugins/deep-link/android/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">
+</manifest>

plugins/deep-link/android/src/main/java/DeepLinkPlugin.kt

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+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+package app.tauri.deep_link
+
+import android.app.Activity
+import android.content.Intent
+import android.webkit.WebView
+import app.tauri.Logger
+import app.tauri.annotation.Command
+import app.tauri.annotation.TauriPlugin
+import app.tauri.plugin.Channel
+import app.tauri.plugin.JSObject
+import app.tauri.plugin.Plugin
+import app.tauri.plugin.Invoke
+
+@TauriPlugin
+class DeepLinkPlugin(private val activity: Activity): Plugin(activity) {
+    //private val implementation = Example()
+    private var webView: WebView? = null
+    private var currentUrl: String? = null
+    private var channel: Channel? = null
+
+    companion object {
+        var instance: DeepLinkPlugin? = null
+    }
+
+    @Command
+    fun getCurrent(invoke: Invoke) {
+        val ret = JSObject()
+        ret.put("url", this.currentUrl)
+        invoke.resolve(ret)
+    }
+
+    /* @Command
+    fun registerListenerRust(invoke: Invoke) {
+        val value = invoke.getString("value") ?: ""
+        val ret = JSObject()
+        ret.put("value", this.currentUrl ?: "none")
+        invoke.resolve(ret)
+    } */
+
+    @Command
+    fun setEventHandler(invoke: Invoke) {
+        val channel = invoke.getChannel("handler")
+
+        if (channel == null) {
+            invoke.reject("`handler` not provided")
+        }
+        this.channel = channel
+        invoke.resolve()
+    }
+
+    override fun load(webView: WebView) {
+        instance = this
+
+        var intent = activity.intent
+
+        if (intent.action == Intent.ACTION_VIEW) {
+            // TODO: check if it makes sense to split up init url and last url
+            this.currentUrl = intent.data.toString()
+            val event = JSObject()
+            event.put("url", this.currentUrl)
+            this.channel?.send(event)
+        }
+
+        super.load(webView)
+        this.webView = webView
+    }
+
+    override fun onNewIntent(intent: Intent) {
+        if (intent.action == Intent.ACTION_VIEW) {
+            this.currentUrl = intent.data.toString()
+            val event = JSObject()
+            event.put("url", this.currentUrl)
+            this.channel?.send(event)
+        }
+    }
+}

plugins/deep-link/android/src/test/java/ExampleUnitTest.kt

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+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+package app.tauri.deep_link
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}