1 files changed, 71 insertions, 0 deletions
diff --git a/ui/src/main/java/com/wireguard/android/preference/ToolsInstallerPreference.kt b/ui/src/main/java/com/wireguard/android/preference/ToolsInstallerPreference.kt
new file mode 100644
index 00000000..f7dd932d
--- /dev/null
+++ b/ui/src/main/java/com/wireguard/android/preference/ToolsInstallerPreference.kt
@@ -0,0 +1,71 @@
+/*
+ * Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.wireguard.android.preference
+
+import android.content.Context
+import android.util.AttributeSet
+import androidx.preference.Preference
+import com.wireguard.android.Application
+import com.wireguard.android.R
+import com.wireguard.android.util.ToolsInstaller
+
+/**
+ * Preference implementing a button that asynchronously runs `ToolsInstaller` and displays the
+ * result as the preference summary.
+ */
+class ToolsInstallerPreference(context: Context, attrs: AttributeSet?) : Preference(context, attrs) {
+    private var state = State.INITIAL
+
+    override fun getSummary() = context.getString(state.messageResourceId)
+
+    override fun getTitle() = context.getString(R.string.tools_installer_title)
+
+    override fun onAttached() {
+        super.onAttached()
+        Application.getAsyncWorker().supplyAsync(Application.getToolsInstaller()::areInstalled).whenComplete(this::onCheckResult)
+    }
+
+    private fun onCheckResult(state: Int, throwable: Throwable?) {
+        when {
+            throwable != null || state == ToolsInstaller.ERROR -> setState(State.INITIAL)
+            state and ToolsInstaller.YES == ToolsInstaller.YES -> setState(State.ALREADY)
+            state and (ToolsInstaller.MAGISK or ToolsInstaller.NO) == ToolsInstaller.MAGISK or ToolsInstaller.NO -> setState(State.INITIAL_MAGISK)
+            state and (ToolsInstaller.SYSTEM or ToolsInstaller.NO) == ToolsInstaller.SYSTEM or ToolsInstaller.NO -> setState(State.INITIAL_SYSTEM)
+            else -> setState(State.INITIAL)
+        }
+    }
+
+    override fun onClick() {
+        setState(State.WORKING)
+        Application.getAsyncWorker().supplyAsync { Application.getToolsInstaller().install() }.whenComplete { result: Int, throwable: Throwable? -> onInstallResult(result, throwable) }
+    }
+
+    private fun onInstallResult(result: Int, throwable: Throwable?) {
+        when {
+            throwable != null -> setState(State.FAILURE)
+            result and (ToolsInstaller.YES or ToolsInstaller.MAGISK) == ToolsInstaller.YES or ToolsInstaller.MAGISK -> setState(State.SUCCESS_MAGISK)
+            result and (ToolsInstaller.YES or ToolsInstaller.SYSTEM) == ToolsInstaller.YES or ToolsInstaller.SYSTEM -> setState(State.SUCCESS_SYSTEM)
+            else -> setState(State.FAILURE)
+        }
+    }
+
+    private fun setState(state: State) {
+        if (this.state == state) return
+        this.state = state
+        if (isEnabled != state.shouldEnableView) isEnabled = state.shouldEnableView
+        notifyChanged()
+    }
+
+    private enum class State(val messageResourceId: Int, val shouldEnableView: Boolean) {
+        INITIAL(R.string.tools_installer_initial, true),
+        ALREADY(R.string.tools_installer_already, false),
+        FAILURE(R.string.tools_installer_failure, true),
+        WORKING(R.string.tools_installer_working, false),
+        INITIAL_SYSTEM(R.string.tools_installer_initial_system, true),
+        SUCCESS_SYSTEM(R.string.tools_installer_success_system, false),
+        INITIAL_MAGISK(R.string.tools_installer_initial_magisk, true),
+        SUCCESS_MAGISK(R.string.tools_installer_success_magisk, false);
+    }
+}