feat(android): implement dialogs and permissions (#685)

.changes/android-file-chooser.md

@@ -0,0 +1,5 @@
+---
+"wry": minor
+---
+
+Implement `<input type="file">` on Android.

.changes/android-js-alerts.md

@@ -0,0 +1,5 @@
+---
+"wry": minor
+---
+
+Enable JS alert, confirm, prompt on Android.

.changes/android-permissions.md

@@ -0,0 +1,5 @@
+---
+"wry": minor
+---
+
+Prompt for permissions on Android when needed.

build.rs

@@ -36,9 +36,11 @@ fn main() {
     let kotlin_out_dir = PathBuf::from(kotlin_out_dir)
       .canonicalize()
       .expect("Failed to canonicalize path");
-    let kotlin_files =
-      fs::read_dir(PathBuf::from(env_var("CARGO_MANIFEST_DIR")).join("src/webview/android/kotlin"))
-        .expect("failed to read kotlin directory");
+
+    let kotlin_files_path =
+      PathBuf::from(env_var("CARGO_MANIFEST_DIR")).join("src/webview/android/kotlin");
+    println!("cargo:rerun-if-changed={}", kotlin_files_path.display());
+    let kotlin_files = fs::read_dir(kotlin_files_path).expect("failed to read kotlin directory");
 
     for file in kotlin_files {
       let file = file.unwrap();

src/webview/android/kotlin/Logger.kt

@@ -0,0 +1,85 @@
+// Copyright 2020-2022 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+package {{app-domain-reversed}}.{{app-name-snake-case}}
+
+// taken from https://github.com/ionic-team/capacitor/blob/6658bca41e78239347e458175b14ca8bd5c1d6e8/android/capacitor/src/main/java/com/getcapacitor/Logger.java
+
+import android.text.TextUtils;
+import android.util.Log;
+
+class Logger {
+  companion object {
+    private const val LOG_TAG_CORE = "Tauri"
+
+    fun tags(vararg subtags: String): String {
+      return if (subtags.isNotEmpty()) {
+        LOG_TAG_CORE + "/" + TextUtils.join("/", subtags)
+      } else LOG_TAG_CORE
+    }
+
+    fun verbose(message: String) {
+      verbose(LOG_TAG_CORE, message)
+    }
+
+    private fun verbose(tag: String, message: String) {
+      if (!shouldLog()) {
+        return
+      }
+      Log.v(tag, message)
+    }
+
+    fun debug(message: String) {
+      debug(LOG_TAG_CORE, message)
+    }
+
+    fun debug(tag: String, message: String) {
+      if (!shouldLog()) {
+        return
+      }
+      Log.d(tag, message)
+    }
+
+    fun info(message: String) {
+      info(LOG_TAG_CORE, message)
+    }
+
+    fun info(tag: String, message: String) {
+      if (!shouldLog()) {
+        return
+      }
+      Log.i(tag, message)
+    }
+
+    fun warn(message: String) {
+      warn(LOG_TAG_CORE, message)
+    }
+
+    fun warn(tag: String, message: String) {
+      if (!shouldLog()) {
+        return
+      }
+      Log.w(tag, message)
+    }
+
+    fun error(message: String) {
+      error(LOG_TAG_CORE, message, null)
+    }
+
+    fun error(message: String, e: Throwable?) {
+      error(LOG_TAG_CORE, message, e)
+    }
+
+    fun error(tag: String, message: String, e: Throwable?) {
+      if (!shouldLog()) {
+        return
+      }
+      Log.e(tag, message, e)
+    }
+
+    private fun shouldLog(): Boolean {
+      return BuildConfig.DEBUG
+    }
+  }
+}

src/webview/android/kotlin/PermissionHelper.kt

@@ -0,0 +1,122 @@
+// Copyright 2020-2022 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+package {{app-domain-reversed}}.{{app-name-snake-case}}
+
+// taken from https://github.com/ionic-team/capacitor/blob/6658bca41e78239347e458175b14ca8bd5c1d6e8/android/capacitor/src/main/java/com/getcapacitor/PermissionHelper.java
+
+import android.content.Context;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.os.Build;
+import androidx.core.app.ActivityCompat;
+import java.util.ArrayList;
+import java.util.Arrays;
+import kotlin.collections.List;
+
+object PermissionHelper {
+  /**
+   * Checks if a list of given permissions are all granted by the user
+   *
+   * @since 3.0.0
+   * @param permissions Permissions to check.
+   * @return True if all permissions are granted, false if at least one is not.
+   */
+  fun hasPermissions(context: Context?, permissions: Array<String>): Boolean {
+    for (perm in permissions) {
+      if (ActivityCompat.checkSelfPermission(
+          context!!,
+          perm
+        ) != PackageManager.PERMISSION_GRANTED
+      ) {
+        return false
+      }
+    }
+    return true
+  }
+
+  /**
+   * Check whether the given permission has been defined in the AndroidManifest.xml
+   *
+   * @since 3.0.0
+   * @param permission A permission to check.
+   * @return True if the permission has been defined in the Manifest, false if not.
+   */
+  fun hasDefinedPermission(context: Context, permission: String): Boolean {
+    var hasPermission = false
+    val requestedPermissions = getManifestPermissions(context)
+    if (requestedPermissions != null && requestedPermissions.isNotEmpty()) {
+      val requestedPermissionsList = listOf(*requestedPermissions)
+      val requestedPermissionsArrayList = ArrayList(requestedPermissionsList)
+      if (requestedPermissionsArrayList.contains(permission)) {
+        hasPermission = true
+      }
+    }
+    return hasPermission
+  }
+
+  /**
+   * Check whether all of the given permissions have been defined in the AndroidManifest.xml
+   * @param context the app context
+   * @param permissions a list of permissions
+   * @return true only if all permissions are defined in the AndroidManifest.xml
+   */
+  fun hasDefinedPermissions(context: Context, permissions: Array<String>): Boolean {
+    for (permission in permissions) {
+      if (!hasDefinedPermission(context, permission)) {
+        return false
+      }
+    }
+    return true
+  }
+
+  /**
+   * Get the permissions defined in AndroidManifest.xml
+   *
+   * @since 3.0.0
+   * @return The permissions defined in AndroidManifest.xml
+   */
+  private fun getManifestPermissions(context: Context): Array<String>? {
+    var requestedPermissions: Array<String>? = null
+    try {
+      val pm = context.packageManager
+      val packageInfo = if (Build.VERSION.SDK_INT >= 33) {
+        pm.getPackageInfo(context.packageName, PackageManager.PackageInfoFlags.of(PackageManager.GET_PERMISSIONS.toLong()))
+      } else {
+        @Suppress("DEPRECATION")
+        pm.getPackageInfo(context.packageName, PackageManager.GET_PERMISSIONS)
+      }
+      if (packageInfo != null) {
+        requestedPermissions = packageInfo.requestedPermissions
+      }
+    } catch (ex: Exception) {
+    }
+    return requestedPermissions
+  }
+
+  /**
+   * Given a list of permissions, return a new list with the ones not present in AndroidManifest.xml
+   *
+   * @since 3.0.0
+   * @param neededPermissions The permissions needed.
+   * @return The permissions not present in AndroidManifest.xml
+   */
+  fun getUndefinedPermissions(context: Context, neededPermissions: Array<String?>): Array<String?> {
+    val undefinedPermissions = ArrayList<String?>()
+    val requestedPermissions = getManifestPermissions(context)
+    if (requestedPermissions != null && requestedPermissions.isNotEmpty()) {
+      val requestedPermissionsList = listOf(*requestedPermissions)
+      val requestedPermissionsArrayList = ArrayList(requestedPermissionsList)
+      for (permission in neededPermissions) {
+        if (!requestedPermissionsArrayList.contains(permission)) {
+          undefinedPermissions.add(permission)
+        }
+      }
+      var undefinedPermissionArray = arrayOfNulls<String>(undefinedPermissions.size)
+      undefinedPermissionArray = undefinedPermissions.toArray(undefinedPermissionArray)
+      return undefinedPermissionArray
+    }
+    return neededPermissions
+  }
+}