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99 changes: 99 additions & 0 deletions
99
readium/lcp/src/main/java/org/readium/r2/lcp/LcpDownloadsRepository.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| /* | ||
| * Copyright 2023 Readium Foundation. All rights reserved. | ||
| * Use of this source code is governed by the BSD-style license | ||
| * available in the top-level LICENSE file of the project. | ||
| */ | ||
|
|
||
| package org.readium.r2.lcp | ||
|
|
||
| import android.content.Context | ||
| import java.io.File | ||
| import java.util.LinkedList | ||
| import kotlinx.coroutines.Deferred | ||
| import kotlinx.coroutines.Dispatchers | ||
| import kotlinx.coroutines.async | ||
| import kotlinx.coroutines.launch | ||
| import kotlinx.coroutines.withContext | ||
| import org.json.JSONObject | ||
| import org.readium.r2.shared.util.CoroutineQueue | ||
|
|
||
| internal class LcpDownloadsRepository( | ||
| context: Context | ||
| ) { | ||
| private val queue = CoroutineQueue() | ||
|
|
||
| private val storageDir: Deferred<File> = | ||
| queue.scope.async { | ||
| withContext(Dispatchers.IO) { | ||
| File(context.noBackupFilesDir, LcpDownloadsRepository::class.qualifiedName!!) | ||
| .also { if (!it.exists()) it.mkdirs() } | ||
| } | ||
| } | ||
|
|
||
| private val storageFile: Deferred<File> = | ||
| queue.scope.async { | ||
| withContext(Dispatchers.IO) { | ||
| File(storageDir.await(), "licenses.json") | ||
| .also { if (!it.exists()) { it.writeText("{}", Charsets.UTF_8) } } | ||
| } | ||
| } | ||
|
|
||
| private val snapshot: Deferred<MutableMap<String, JSONObject>> = | ||
| queue.scope.async { | ||
| readSnapshot().toMutableMap() | ||
| } | ||
|
|
||
| fun addDownload(id: String, license: JSONObject) { | ||
| queue.scope.launch { | ||
| val snapshotCompleted = snapshot.await() | ||
| snapshotCompleted[id] = license | ||
| writeSnapshot(snapshotCompleted) | ||
| } | ||
| } | ||
|
|
||
| fun removeDownload(id: String) { | ||
| queue.launch { | ||
| val snapshotCompleted = snapshot.await() | ||
| snapshotCompleted.remove(id) | ||
| writeSnapshot(snapshotCompleted) | ||
| } | ||
| } | ||
|
|
||
| suspend fun retrieveLicense(id: String): JSONObject? = | ||
| queue.await { | ||
| snapshot.await()[id] | ||
| } | ||
|
|
||
| private suspend fun readSnapshot(): Map<String, JSONObject> { | ||
| return withContext(Dispatchers.IO) { | ||
| storageFile.await().readText(Charsets.UTF_8).toData().toMutableMap() | ||
| } | ||
| } | ||
|
|
||
| private suspend fun writeSnapshot(snapshot: Map<String, JSONObject>) { | ||
| val storageFileCompleted = storageFile.await() | ||
| withContext(Dispatchers.IO) { | ||
| storageFileCompleted.writeText(snapshot.toJson(), Charsets.UTF_8) | ||
| } | ||
| } | ||
|
|
||
| private fun Map<String, JSONObject>.toJson(): String { | ||
| val jsonObject = JSONObject() | ||
| for ((id, license) in this.entries) { | ||
| jsonObject.put(id, license) | ||
| } | ||
| return jsonObject.toString() | ||
| } | ||
|
|
||
| private fun String.toData(): Map<String, JSONObject> { | ||
| val jsonObject = JSONObject(this) | ||
| val names = jsonObject.keys().iterator().toList() | ||
| return names.associateWith { jsonObject.getJSONObject(it) } | ||
| } | ||
|
|
||
| private fun <T> Iterator<T>.toList(): List<T> = | ||
| LinkedList<T>().apply { | ||
| while (hasNext()) | ||
| this += next() | ||
| }.toMutableList() | ||
| } |
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