Implement Panic response

README.md

@@ -24,3 +24,10 @@ your connection through volunteer proxies located in uncensored countries.
 Similar to VPNs, which help users bypass Internet censorship, Snowflake disguises your Internet
 activity as though you’re making a video or voice call, making you less detectable to Internet
 censors.
+
+## Panic Kit Support
+
+This app responds to "Panic Button" apps such as [Ripple](https://github.com/guardianproject/ripple).
+If the panic button is triggered, the app will delete all data, reset user preferences, and hide
+itself has an app called "Plants" 🪴. If you open that Plants app, the app's name and icon will be
+restored.

app/src/main/AndroidManifest.xml

@@ -20,15 +20,45 @@
         <activity
             android:name=".ui.MainActivity"
             android:exported="true"
-            android:launchMode="singleInstance"
-            android:theme="@style/Theme.Snowflake">
+            android:launchMode="singleInstance">
+            <intent-filter>
+                <action android:name="android.service.quicksettings.action.QS_TILE_PREFERENCES" />
+            </intent-filter>
+        </activity>
+        <activity-alias
+            android:name=".ui.DefaultLauncher"
+            android:enabled="true"
+            android:exported="true"
+            android:icon="@mipmap/ic_launcher"
+            android:label="@string/app_name"
+            android:targetActivity=".ui.MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+        </activity-alias>
+        <activity-alias
+            android:name=".ui.HiddenLauncher"
+            android:enabled="false"
+            android:exported="true"
+            android:icon="@mipmap/ic_hidden_launcher"
+            android:label="@string/hidden_app_name"
+            android:targetActivity=".ui.MainActivity">
             <intent-filter>
-                <action android:name="android.service.quicksettings.action.QS_TILE_PREFERENCES" />
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity-alias>
+
+        <activity
+            android:name=".ui.PanicResponseActivity"
+            android:exported="true"
+            android:noHistory="true"
+            android:theme="@android:style/Theme.NoDisplay">
+            <intent-filter>
+                <action android:name="info.guardianproject.panic.action.TRIGGER" />
+
+                <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
         </activity>
 

app/src/main/java/io/bloco/snowflake/Dependencies.kt

@@ -53,7 +53,7 @@ class Dependencies(
             }
         }
     }
-    private val appDatabase by lazy {
+    val appDatabase by lazy {
         Room.databaseBuilder(app, AppDatabase::class.java, "snowflake").build()
     }
     private val statsDao by lazy { appDatabase.statsDao() }

app/src/main/java/io/bloco/snowflake/data/AppDataStore.kt

@@ -74,6 +74,12 @@ class AppDataStore(
 
     suspend fun setStunServersDate(date: Instant) = dataStore().edit { it[STUN_SERVERS_DATE] = date.epochSeconds }
 
+    // Clear
+
+    suspend fun clear() {
+        dataStoreFlow().first().edit { it.clear() }
+    }
+
     // Internal
 
     @Suppress("ktlint:standard:backing-property-naming")

app/src/main/java/io/bloco/snowflake/data/database/AppDatabase.kt

@@ -4,6 +4,8 @@ import androidx.room.Database
 import androidx.room.RoomDatabase
 import androidx.room.TypeConverters
 import io.bloco.snowflake.models.DayStats
+import timber.log.Timber
+import java.io.File
 
 @Database(
     entities = [DayStats::class],
@@ -12,4 +14,13 @@ import io.bloco.snowflake.models.DayStats
 @TypeConverters(LocalDateConverter::class)
 abstract class AppDatabase : RoomDatabase() {
     abstract fun statsDao(): StatsDao
+
+    fun clear() {
+        try {
+            if (isOpen) close()
+            openHelper.readableDatabase.path?.let { File(it).delete() }
+        } catch (e: Exception) {
+            Timber.e(e, "Failed to delete database")
+        }
+    }
 }

app/src/main/java/io/bloco/snowflake/ui/Launchers.kt

@@ -0,0 +1,37 @@
+package io.bloco.snowflake.ui
+
+import android.app.Activity
+import android.content.ComponentName
+import android.content.pm.PackageManager
+
+sealed interface Launcher
+
+object DefaultLauncher : Launcher
+
+object HiddenLauncher : Launcher
+
+val LAUNCHERS = listOf(DefaultLauncher, HiddenLauncher)
+
+fun Activity.setLauncher(launcher: Launcher) {
+    LAUNCHERS.forEach {
+        setLauncherEnabled(launcher = it, isEnabled = launcher == it)
+    }
+}
+
+private fun Activity.setLauncherEnabled(
+    launcher: Launcher,
+    isEnabled: Boolean,
+) {
+    application.packageManager.setComponentEnabledSetting(
+        ComponentName(
+            application,
+            launcher::class.java.name,
+        ),
+        if (isEnabled) {
+            PackageManager.COMPONENT_ENABLED_STATE_ENABLED
+        } else {
+            PackageManager.COMPONENT_ENABLED_STATE_DISABLED
+        },
+        PackageManager.DONT_KILL_APP,
+    )
+}

app/src/main/java/io/bloco/snowflake/ui/MainActivity.kt

@@ -40,6 +40,7 @@ class MainActivity : ComponentActivity() {
         installSplashScreen()
         super.onCreate(savedInstanceState)
         enableEdgeToEdge()
+        setLauncher(DefaultLauncher)
 
         setContent {
             val viewModel = viewModel { dependencies.mainViewModel }

app/src/main/java/io/bloco/snowflake/ui/PanicResponseActivity.kt

@@ -0,0 +1,34 @@
+package io.bloco.snowflake.ui
+
+import android.Manifest
+import android.os.Build
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import info.guardianproject.panic.PanicResponder
+import io.bloco.snowflake.App
+import kotlinx.coroutines.runBlocking
+import kotlin.system.exitProcess
+
+/*
+ * If a Panic button is trigger, reset the app state as much as possible
+ */
+class PanicResponseActivity : ComponentActivity() {
+    private val dependencies by lazy { (applicationContext as App).dependencies }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        if (PanicResponder.shouldUseDefaultResponseToTrigger(this)) {
+            runBlocking {
+                dependencies.appDataStore.clear()
+                dependencies.appDatabase.clear()
+            }
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+                revokeSelfPermissionOnKill(Manifest.permission.POST_NOTIFICATIONS)
+            }
+            setLauncher(HiddenLauncher)
+            exitProcess(0)
+        } else {
+            finish()
+        }
+    }
+}

app/src/main/res/drawable/ic_hidden_launcher_foreground.xml

@@ -0,0 +1,14 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+  <group android:scaleX="0.5"
+      android:scaleY="0.5"
+      android:translateX="240"
+      android:translateY="240">
+    <path
+        android:pathData="M342,800h276l40,-160L302,640l40,160ZM342,880q-28,0 -49,-17t-28,-44l-45,-179h520l-45,179q-7,27 -28,44t-49,17L342,880ZM200,560h560v-80L200,480v80ZM480,320q0,-100 70,-170t170,-70q0,90 -57,156t-143,80v84h320v160q0,33 -23.5,56.5T760,640L200,640q-33,0 -56.5,-23.5T120,560v-160h320v-84q-86,-14 -143,-80t-57,-156q100,0 170,70t70,170Z"
+        android:fillColor="#2B5C62"/>
+  </group>
+</vector>

app/src/main/res/mipmap-anydpi/ic_hidden_launcher.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_hidden_launcher_foreground"/>
+    <monochrome android:drawable="@drawable/ic_hidden_launcher_foreground"/>
+</adaptive-icon>

app/src/main/res/values/strings.xml

@@ -1,7 +1,10 @@
 <resources>
     <string name="app_name" translatable="false">Snowflake</string>
 
+    <string name="hidden_app_name">Plants</string>
     <string name="close">Close</string>
+    <string name="enabled">Enabled</string>
+    <string name="disabled">Disabled</string>
 
     <string name="snowflake_disabled">Enable Snowflake. Help others bypass censorship.</string>
     <string name="snowflake_enabled">Snowflake is Active. You’re helping bypass censorship.</string>
@@ -68,7 +71,4 @@
 
     <string name="quick_settings_looking">Looking…</string>
     <string name="quick_settings_helping">Helping %d</string>
-
-    <string name="enabled">Enabled</string>
-    <string name="disabled">Disabled</string>
 </resources>

gradle/libs.versions.toml

@@ -53,6 +53,7 @@ ktor-json = { module = "io.ktor:ktor-serialization-kotlinx-json", version.ref =
 room-runtime = { module = "androidx.room:room-runtime", version.ref = "room" }
 room-ktx = { module = "androidx.room:room-ktx", version.ref = "room" }
 room-compiler = { module = "androidx.room:room-compiler", version.ref = "room" }
+panic = { module = "info.guardianproject.panic:panic", version = "1.0" }
 
 [bundles]
 kotlin = [
@@ -89,6 +90,7 @@ app = [
     "ktor-json",
     "room-runtime",
     "room-ktx",
+    "panic",
 ]
 ksp = [
     "room-compiler",