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app/src/main/java/dev/equwal/inkdim/Shell.kt (4703 bytes)

 // SPDX-License-Identifier: GPL-3.0-or-later
 // Copyright (c) 2026 equwal
 package dev.equwal.inkdim
 
 import android.content.Context
 import android.content.pm.PackageManager
 import android.os.Handler
 import android.os.Looper
 import android.util.Log
 import rikka.shizuku.Shizuku
 import java.util.concurrent.Executors
 
 /**
  * Shell access, by way of Shizuku.
  *
  * Shizuku is a separate, free app. The user starts it from the device itself
  * through Android's wireless debugging. There is no computer and no root. Once
  * it runs and has said yes to this app, this object can start a process under
  * the shell uid. That is what writes the light node.
  *
  * It uses Shizuku's plain remote-process call and nothing more. Shizuku's bound
  * "user service" is the tidier design, but its starter dies inside
  * LoadedApk.makeApplication on Android 16 before our code is loaded.
  */
 object Shell {
 
     private const val TAG = "InkDim"
 
     const val SHIZUKU_PACKAGE = "moe.shizuku.privileged.api"
     private const val REQUEST_CODE = 7301
 
     enum class State { NOT_INSTALLED, NOT_RUNNING, NO_PERMISSION, READY }
 
     private val main = Handler(Looper.getMainLooper())
     private val worker = Executors.newSingleThreadExecutor()
     private val listeners = ArrayList<() -> Unit>()
     private var hooked = false
 
     val ready: Boolean get() = alive() && permitted()
 
     fun state(c: Context): State = when {
         ready -> State.READY
         !installed(c) -> State.NOT_INSTALLED
         !alive() -> State.NOT_RUNNING
         else -> State.NO_PERMISSION
     }
 
     fun describe(c: Context): String = when (state(c)) {
         State.READY -> "On"
         State.NO_PERMISSION -> "Shizuku runs, permission needed"
         State.NOT_RUNNING -> "Shizuku is installed, not started"
         State.NOT_INSTALLED -> "Off, needs the free Shizuku app"
     }
 
     /** Called when the state can have changed. Always on the main thread. */
     fun onChange(l: () -> Unit) { if (l !in listeners) listeners.add(l) }
     fun removeOnChange(l: () -> Unit) { listeners.remove(l) }
     private fun changed() = main.post { ArrayList(listeners).forEach { it() } }
 
     private fun installed(c: Context): Boolean =
         runCatching { c.packageManager.getPackageInfo(SHIZUKU_PACKAGE, 0); true }.getOrDefault(false)
 
     private fun alive(): Boolean = runCatching { Shizuku.pingBinder() }.getOrDefault(false)
 
     private fun permitted(): Boolean = runCatching {
         !Shizuku.isPreV11() && Shizuku.checkSelfPermission() == PackageManager.PERMISSION_GRANTED
     }.getOrDefault(false)
 
     /** Safe to call often. It registers for Shizuku's comings and goings once. */
     fun connect(c: Context) {
         if (!hooked) {
             hooked = true
             runCatching {
                 Shizuku.addBinderReceivedListenerSticky { changed() }
                 Shizuku.addBinderDeadListener { changed() }
                 Shizuku.addRequestPermissionResultListener { _, _ -> changed() }
             }
         }
         changed()
     }
 
     fun requestPermission() {
         runCatching { if (alive() && !permitted()) Shizuku.requestPermission(REQUEST_CODE) }
     }
 
     // ---- processes ---------------------------------------------------------
 
     /**
      * Shizuku.newProcess is private in the v13 API, but it is the supported wire
      * call underneath, and the one that every shell-style client uses.
      */
     private val newProcess by lazy {
         Shizuku::class.java.getDeclaredMethod(
             "newProcess", Array<String>::class.java, Array<String>::class.java, String::class.java
         ).apply { isAccessible = true }
     }
 
     private fun start(vararg argv: String): Process? = runCatching {
         newProcess.invoke(null, argv, null, null) as Process
     }.onFailure { Log.w(TAG, "shell process failed: " + argv.joinToString(" "), it) }.getOrNull()
 
     data class Result(val exit: Int, val output: String) {
         val ok: Boolean get() = exit == 0
     }
 
     private fun execNow(command: String): Result {
         val p = start("sh", "-c", "$command 2>&1") ?: return Result(-1, "no shell access")
         return runCatching {
             val out = p.inputStream.bufferedReader().readText()
             Result(p.waitFor(), out)
         }.getOrElse { Result(-1, it.toString()) }
     }
 
     /** Runs off the main thread. [done] comes back on the main thread. */
     fun run(command: String, done: ((Result) -> Unit)? = null) {
         worker.execute {
             val r = if (ready) execNow(command) else Result(-1, "no shell access")
             if (!r.ok) Log.i(TAG, "shell: " + command + " -> " + r.exit + " " + r.output.take(200))
             done?.let { main.post { it(r) } }
         }
     }
 }