Phase 5: PackageInstaller hand-off for verified updates

app/src/main/java/io/github/abrarul/modularai/update/Installer.kt

@@ -0,0 +1,36 @@
+package io.github.abrarul.modularai.update
+
+import android.app.PendingIntent
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageInstaller
+
+object Installer {
+    /** Streams [apk] into a PackageInstaller session; Android shows its own confirm dialog. */
+    fun install(ctx: Context, apk: java.io.File) {
+        val pi = ctx.packageManager.packageInstaller
+        val id = pi.createSession(PackageInstaller.SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL))
+        pi.openSession(id).use { s ->
+            s.openWrite("update.apk", 0, apk.length()).use { o ->
+                apk.inputStream().use { it.copyTo(o) }
+                s.fsync(o)
+            }
+            val cb = PendingIntent.getBroadcast(
+                ctx, id, Intent(ctx, InstallReceiver::class.java).setPackage(ctx.packageName),
+                PendingIntent.FLAG_MUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
+            )
+            s.commit(cb.intentSender)
+        }
+    }
+}
+
+class InstallReceiver : BroadcastReceiver() {
+    override fun onReceive(ctx: Context, i: Intent) {
+        if (i.getIntExtra(PackageInstaller.EXTRA_STATUS, -1) == PackageInstaller.STATUS_PENDING_USER_ACTION) {
+            @Suppress("DEPRECATION")
+            val confirm = i.getParcelableExtra<Intent>(Intent.EXTRA_INTENT)
+            confirm?.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)?.let(ctx::startActivity)
+        }
+    }
+}