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107 changes: 107 additions & 0 deletions
107
app/src/main/java/org/y20k/transistor/helpers/BackupHelper.kt
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * BackupHelper.kt | ||
| * Implements the BackupHelper object | ||
| * A BackupHelper provides helper methods for backing up and restoring the radio station collection | ||
| * | ||
| * This file is part of | ||
| * TRANSISTOR - Radio App for Android | ||
| * | ||
| * Copyright (c) 2015-22 - Y20K.org | ||
| * Licensed under the MIT-License | ||
| * http://opensource.org/licenses/MIT | ||
| */ | ||
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| package org.y20k.transistor.helpers | ||
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| import android.content.ContentResolver | ||
| import android.content.Context | ||
| import android.net.Uri | ||
| import java.io.* | ||
| import java.util.zip.ZipEntry | ||
| import java.util.zip.ZipOutputStream | ||
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| object BackupHelper { | ||
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| /* Define log tag */ | ||
| private val TAG: String = LogHelper.makeLogTag(BackupHelper::class.java) | ||
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| /* xyz */ | ||
| fun backup(context: Context, destinationUri: Uri) { | ||
| val sourceFolder: File? = context.getExternalFilesDir("") | ||
| if (sourceFolder != null && sourceFolder.isDirectory) { | ||
| val resolver: ContentResolver = context.contentResolver | ||
| val outputStream: OutputStream? = resolver.openOutputStream(destinationUri) | ||
| ZipOutputStream(BufferedOutputStream(outputStream)).use { zipOutputStream -> | ||
| zipOutputStream.use { | ||
| zipFolder(it, sourceFolder, "") | ||
| } | ||
| } | ||
| } else { | ||
| LogHelper.e(TAG, "Unable to access External Storage.") | ||
| } | ||
| } | ||
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| /* Compresses folder into ZIP file - Credit: https://stackoverflow.com/a/52216574 */ | ||
| private fun zipFolder(zipOutputStream: ZipOutputStream, source: File, parentDirPath: String) { | ||
| // source.listFiles() will return null, if source is not a directory | ||
| if (source.isDirectory) { | ||
| val data = ByteArray(2048) | ||
| // get all File objects in folder | ||
| for (file in source.listFiles()!!) { | ||
| val path = parentDirPath + File.separator + file.name | ||
| when (file.isDirectory) { | ||
| // CASE: Folder | ||
| true -> { | ||
| // val entry = ZipEntry(path + File.separator) // add separator to make entry a folder | ||
| // entry.time = file.lastModified() | ||
| // entry.size = file.length() | ||
| // zipOutputStream.putNextEntry(entry) | ||
| // call zipFolder recursively to add files within this folder | ||
| zipFolder(zipOutputStream, file, path) | ||
| } | ||
| // CASE: File | ||
| false -> { | ||
| FileInputStream(file).use { fileInputStream -> | ||
| BufferedInputStream(fileInputStream).use { bufferedInputStream -> | ||
| val entry = ZipEntry(path) | ||
| entry.time = file.lastModified() | ||
| entry.size = file.length() | ||
| zipOutputStream.putNextEntry(entry) | ||
| while (true) { | ||
| val readBytes = bufferedInputStream.read(data) | ||
| if (readBytes == -1) { | ||
| break | ||
| } | ||
| zipOutputStream.write(data, 0, readBytes) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| } | ||
| } | ||
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| /* Normalize file path - protects against zip slip attack */ | ||
| @Throws(IOException::class) | ||
| private fun getFile(destinationFolder: File, zipEntry: ZipEntry): File { | ||
| val destinationFile = File(destinationFolder, zipEntry.name) | ||
| val destinationFolderPath = destinationFolder.canonicalPath | ||
| val destinationFilePath = destinationFile.canonicalPath | ||
| // make sure that zipEntry path is in the destination folder | ||
| if (!destinationFilePath.startsWith(destinationFolderPath + File.separator)) { | ||
| throw IOException("ZIP entry is not within of the destination folder: " + zipEntry.name) | ||
| } | ||
| return destinationFile | ||
| } | ||
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| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| <vector xmlns:android="http://schemas.android.com/apk/res/android" | ||
| android:width="24dp" | ||
| android:height="24dp" | ||
| android:viewportWidth="24" | ||
| android:viewportHeight="24"> | ||
| <path | ||
| android:fillColor="@color/icon_default" | ||
| android:pathData="M15,6H3v2h12V6zM15,10H3v2h12V10zM3,16h8v-2H3V16zM17,6v8.18C16.69,14.07 16.35,14 16,14c-1.66,0 -3,1.34 -3,3s1.34,3 3,3s3,-1.34 3,-3V8h3V6H17z"/> | ||
| </vector> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| <vector xmlns:android="http://schemas.android.com/apk/res/android" | ||
| android:width="24dp" | ||
| android:height="24dp" | ||
| android:viewportWidth="24" | ||
| android:viewportHeight="24"> | ||
| <path | ||
| android:fillColor="@color/icon_default" | ||
| android:pathData="M14,12c0,-1.1 -0.9,-2 -2,-2s-2,0.9 -2,2 0.9,2 2,2 2,-0.9 2,-2zM12,3c-4.97,0 -9,4.03 -9,9L0,12l4,4 4,-4L5,12c0,-3.87 3.13,-7 7,-7s7,3.13 7,7 -3.13,7 -7,7c-1.51,0 -2.91,-0.49 -4.06,-1.3l-1.42,1.44C8.04,20.3 9.94,21 12,21c4.97,0 9,-4.03 9,-9s-4.03,-9 -9,-9z"/> | ||
| </vector> |
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