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/src/androidTest/java/ExampleInstrumentedTest.kt

@@ -0,0 +1,28 @@
+// 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)
+    }
+}