Unpack download archive.

app/src/main/java/de/ccc/events/badge/card10/hatchery/AppDetailFragment.kt

@@ -22,16 +22,25 @@
 
 package de.ccc.events.badge.card10.hatchery
 
+import android.content.DialogInterface
 import android.os.AsyncTask
 import android.os.Bundle
+import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.appcompat.app.AlertDialog
 import androidx.fragment.app.Fragment
 import de.ccc.events.badge.card10.R
+import de.ccc.events.badge.card10.common.LoadingDialog
 import kotlinx.android.synthetic.main.app_detail_fragment.*
+import org.apache.commons.compress.archivers.tar.TarArchiveEntry
+import org.apache.commons.compress.archivers.tar.TarArchiveInputStream
+import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream
 import java.io.File
 
+private const val TAG = "AppDetailFragment"
+
 class AppDetailFragment : Fragment() {
 
     private lateinit var app: App
@@ -54,28 +63,71 @@ class AppDetailFragment : Fragment() {
         label_description.text = app.description
 
         button_download.setOnClickListener {
-            ReleaseDownload(app).execute()
+            val ctx = activity ?: throw java.lang.IllegalStateException()
+
+            val loadingDialog = LoadingDialog()
+            loadingDialog.show(fragmentManager, "loading")
+
+            val errorDialog =
+                AlertDialog.Builder(ctx).setMessage(R.string.hatchery_error_generic)
+                    .setPositiveButton(
+                        R.string.dialog_action_ok
+                    ) { dialog, _ -> dialog.dismiss() }
+                    .create()
+
+            ReleaseDownload(app, ctx.cacheDir, loadingDialog, errorDialog).execute()
         }
     }
 
-    private class ReleaseDownload(private val app: App) : AsyncTask<Void, Void, String?>() {
+    private class ReleaseDownload(
+        private val app: App,
+        private val cacheDir: File,
+        private val loadingDialog: LoadingDialog,
+        private val errorDialog: AlertDialog
+    ) : AsyncTask<Void, Void, List<String>?>() {
 
-        override fun doInBackground(vararg p0: Void?): String? {
+        override fun doInBackground(vararg p0: Void?): List<String>? {
             return try {
+                cacheDir.deleteRecursively()
+                cacheDir.mkdir()
+
                 val inputStream = HatcheryClient().openDownloadStream(app)
-                val file = File.createTempFile(app.slug, ".tar.gz")
+                val file = File.createTempFile(app.slug, ".tar.gz", cacheDir)
                 val outputStream = file.outputStream()
 
                 inputStream.copyTo(outputStream)
 
-                file.absolutePath
+                val unpackedFiles = mutableListOf<String>()
+                val tarStream = TarArchiveInputStream(GzipCompressorInputStream(file.inputStream()))
+                while (true) {
+                    val entry = tarStream.nextTarEntry ?: break
+                    if (entry.isDirectory) {
+                        continue
+                    }
+
+                    // TODO: A bit hacky. Maybe there is a better way?
+                    val targetFile = File(cacheDir, entry.name)
+                    targetFile.parentFile?.mkdirs()
+                    targetFile.createNewFile()
+                    Log.d(TAG, "Extracting ${entry.name} to ${targetFile.absolutePath}")
+                    tarStream.copyTo(targetFile.outputStream())
+                    unpackedFiles.add(entry.name)
+                }
+
+                unpackedFiles
             } catch (e: Exception) {
                 null
             }
         }
 
-        override fun onPostExecute(result: String?) {
-            // TODO: Handle result
+        override fun onPostExecute(result: List<String>?) {
+            if (result == null) {
+                loadingDialog.dismiss()
+                errorDialog.show()
+                return
+            }
+
+            loadingDialog.dismiss()
         }
     }
 }

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

@@ -16,6 +16,8 @@
     <string name="file_transfer_label_selected_file">Selected file:</string>
 
     <string name="loading_dialog_loading">Loading</string>
+    <string name="dialog_action_ok">OK</string>
+    <string name="dialog_action_cancel">Cancel</string>
 
     <string name="hatchery_error_generic">Something went wrong</string>