From fdd9b023880b1ecebdd4d198f94b6ace86d1b797 Mon Sep 17 00:00:00 2001
From: tom5079 <tom5079@naver.com>
Date: Fri, 28 Aug 2020 22:43:47 +0900
Subject: [PATCH] (Almost) Full OkHTTP implementation

---
 .idea/jarRepositories.xml                     |   5 +
 app/build.gradle                              |  10 +-
 app/src/main/AndroidManifest.xml              |   5 +-
 app/src/main/java/xyz/quaver/pupil/Pupil.kt   |  55 ++++++-
 .../java/xyz/quaver/pupil/PupilGlideModule.kt |   2 +-
 .../pupil/adapters/GalleryBlockAdapter.kt     |   6 +-
 .../UpdateBroadcastReciever.kt}               |  11 +-
 .../quaver/pupil/services/DownloadService.kt  | 155 ++++++++++++++++++
 .../java/xyz/quaver/pupil/ui/MainActivity.kt  |  23 ++-
 .../xyz/quaver/pupil/ui/ReaderActivity.kt     |   8 +-
 .../xyz/quaver/pupil/ui/SettingsActivity.kt   |   3 +-
 .../quaver/pupil/ui/dialog/GalleryDialog.kt   |   5 +-
 .../xyz/quaver/pupil/ui/dialog/ProxyDialog.kt |  11 +-
 .../ui/fragment/ManageFavoritesFragment.kt    |   5 +-
 .../pupil/ui/fragment/SettingsFragment.kt     |   8 +-
 .../xyz/quaver/pupil/util/download/Cache.kt   |  14 +-
 .../pupil/util/download/DownloadWorker.kt     |  55 +++----
 .../main/java/xyz/quaver/pupil/util/misc.kt   |   2 +-
 .../main/java/xyz/quaver/pupil/util/proxy.kt  |   3 +-
 .../main/java/xyz/quaver/pupil/util/update.kt |   3 +-
 app/src/main/res/values-ja/strings.xml        |   3 +
 app/src/main/res/values-ko/strings.xml        |   3 +
 app/src/main/res/values/ids.xml               |   3 +
 app/src/main/res/values/strings.xml           |   6 +
 24 files changed, 307 insertions(+), 97 deletions(-)
 rename app/src/main/java/xyz/quaver/pupil/{BroadcastReciever.kt => reciever/UpdateBroadcastReciever.kt} (93%)
 create mode 100644 app/src/main/java/xyz/quaver/pupil/services/DownloadService.kt

diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
index 3825b2b3..17470b3c 100644
--- a/.idea/jarRepositories.xml
+++ b/.idea/jarRepositories.xml
@@ -51,5 +51,10 @@
       <option name="name" value="maven4" />
       <option name="url" value="https://maven.fabric.io/public" />
     </remote-repository>
+    <remote-repository>
+      <option name="id" value="MavenLocal" />
+      <option name="name" value="MavenLocal" />
+      <option name="url" value="file:/$USER_HOME$/.m2/repository/" />
+    </remote-repository>
   </component>
 </project>
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 7c267bee..fa0b6548 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -48,6 +48,7 @@ android {
         }
     }
     kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_1_8.toString()
         freeCompilerArgs += '-Xuse-experimental=kotlin.Experimental'
     }
     compileOptions {
@@ -68,7 +69,6 @@ dependencies {
     implementation 'androidx.preference:preference:1.1.1'
     implementation 'androidx.gridlayout:gridlayout:1.0.0'
     implementation "androidx.biometric:biometric:1.0.1"
-    implementation 'androidx.multidex:multidex:2.0.1'
     implementation 'androidx.fragment:fragment-ktx:1.2.5'
     implementation "com.daimajia.swipelayout:library:1.2.0@aar"
     implementation 'com.google.android.material:material:1.3.0-alpha02'
@@ -78,8 +78,12 @@ dependencies {
     implementation 'com.google.firebase:firebase-perf:19.0.8'
     implementation 'com.github.arimorty:floatingsearchview:2.1.1'
     implementation 'com.github.clans:fab:1.6.4'
+    //noinspection GradleDependency
+    implementation 'com.squareup.okhttp3:okhttp:3.12.12'
     implementation 'com.github.bumptech.glide:glide:4.11.0'
-    implementation "com.github.bumptech.glide:okhttp3-integration:4.11.0"
+    implementation ("com.github.bumptech.glide:okhttp3-integration:4.11.0") {
+        transitive = false
+    }
     implementation 'com.github.bumptech.glide:annotations:4.11.0'
     annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
     kapt 'com.github.bumptech.glide:compiler:4.11.0'
@@ -92,7 +96,7 @@ dependencies {
     implementation 'com.andrognito.patternlockview:patternlockview:1.0.0'
     //implementation 'com.andrognito.pinlockview:pinlockview:2.1.0'
     implementation "ru.noties.markwon:core:3.1.0"
-    implementation ("xyz.quaver:libpupil:1.0") {
+    implementation ("xyz.quaver:libpupil:1.1") {
         exclude group: 'org.jetbrains.kotlinx', module: 'kotlinx-serialization-core-jvm'
     }
     testImplementation 'junit:junit:4.13'
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index bff446d8..ee5f51b2 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -37,8 +37,11 @@
 
         </provider>
 
+        <service android:name=".services.DownloadService"
+            android:exported="false"/>
+
         <receiver
-            android:name=".BroadcastReciever"
+            android:name=".reciever.UpdateBroadcastReciever"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.DOWNLOAD_COMPLETE" />
diff --git a/app/src/main/java/xyz/quaver/pupil/Pupil.kt b/app/src/main/java/xyz/quaver/pupil/Pupil.kt
index 3e1207fa..1151b7e9 100644
--- a/app/src/main/java/xyz/quaver/pupil/Pupil.kt
+++ b/app/src/main/java/xyz/quaver/pupil/Pupil.kt
@@ -18,6 +18,7 @@
 
 package xyz.quaver.pupil
 
+import android.app.Application
 import android.app.Notification
 import android.app.NotificationChannel
 import android.app.NotificationManager
@@ -25,7 +26,6 @@ import android.content.Context
 import android.os.Build
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.content.ContextCompat
-import androidx.multidex.MultiDexApplication
 import androidx.preference.PreferenceManager
 import com.google.android.gms.common.GooglePlayServicesNotAvailableException
 import com.google.android.gms.common.GooglePlayServicesRepairableException
@@ -35,16 +35,37 @@ import com.google.firebase.crashlytics.FirebaseCrashlytics
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
-import xyz.quaver.proxy
+import okhttp3.Dispatcher
+import okhttp3.Interceptor
+import okhttp3.OkHttpClient
+import okhttp3.Response
 import xyz.quaver.pupil.util.GalleryList
-import xyz.quaver.pupil.util.getProxy
+import xyz.quaver.pupil.util.getProxyInfo
+import xyz.quaver.setClient
 import java.io.File
 import java.util.*
+import java.util.concurrent.TimeUnit
+import kotlin.reflect.KClass
 
-class Pupil : MultiDexApplication() {
+typealias PupilInterceptor = (Interceptor.Chain) -> Response
 
-    lateinit var histories: GalleryList
-    lateinit var favorites: GalleryList
+lateinit var histories: GalleryList
+    private set
+lateinit var favorites: GalleryList
+    private set
+
+val interceptors = mutableMapOf<KClass<out Any>, PupilInterceptor>()
+
+lateinit var clientBuilder: OkHttpClient.Builder
+
+var clientHolder: OkHttpClient? = null
+val client: OkHttpClient
+    get() = clientHolder ?: clientBuilder.build().also {
+        clientHolder = it
+        setClient(it)
+    }
+
+class Pupil : Application() {
 
     init {
         AppCompatDelegate.setCompatVectorFromResourcesEnabled(true)
@@ -63,7 +84,19 @@ class Pupil : MultiDexApplication() {
 
         FirebaseCrashlytics.getInstance().setUserId(userID)
 
-        proxy = getProxy(this)
+        val proxyInfo = getProxyInfo(this)
+
+        clientBuilder = OkHttpClient.Builder()
+            .connectTimeout(0, TimeUnit.SECONDS)
+            .readTimeout(0, TimeUnit.SECONDS)
+            .proxy(proxyInfo.proxy())
+            .proxyAuthenticator(proxyInfo.authenticator())
+            .addInterceptor { chain ->
+                val request = chain.request()
+                val tag = request.tag() ?: return@addInterceptor chain.proceed(request)
+
+                interceptors[tag::class]?.invoke(chain) ?: chain.proceed(request)
+            }
 
         try {
             preference.getString("dl_location", null).also {
@@ -112,6 +145,13 @@ class Pupil : MultiDexApplication() {
                 lockscreenVisibility = Notification.VISIBILITY_SECRET
             })
 
+            manager.createNotificationChannel(NotificationChannel("downloader", getString(R.string.channel_downloader), NotificationManager.IMPORTANCE_LOW).apply {
+                description = getString(R.string.channel_downloader_description)
+                enableLights(false)
+                enableVibration(false)
+                lockscreenVisibility = Notification.VISIBILITY_SECRET
+            })
+
             manager.createNotificationChannel(NotificationChannel("update", getString(R.string.channel_update), NotificationManager.IMPORTANCE_HIGH).apply {
                 description = getString(R.string.channel_update_description)
                 enableLights(true)
@@ -127,7 +167,6 @@ class Pupil : MultiDexApplication() {
             })
         }
 
-        AppCompatDelegate.setCompatVectorFromResourcesEnabled(true)
         AppCompatDelegate.setDefaultNightMode(when (preference.getBoolean("dark_mode", false)) {
             true -> AppCompatDelegate.MODE_NIGHT_YES
             false -> AppCompatDelegate.MODE_NIGHT_NO
diff --git a/app/src/main/java/xyz/quaver/pupil/PupilGlideModule.kt b/app/src/main/java/xyz/quaver/pupil/PupilGlideModule.kt
index da85e719..a46bf974 100644
--- a/app/src/main/java/xyz/quaver/pupil/PupilGlideModule.kt
+++ b/app/src/main/java/xyz/quaver/pupil/PupilGlideModule.kt
@@ -35,7 +35,7 @@ class PupilGlideModule : AppGlideModule() {
         registry.append(
             GlideUrl::class.java,
             InputStream::class.java,
-            OkHttpUrlLoader.Factory(DownloadWorker.getInstance(context).client)
+            OkHttpUrlLoader.Factory(client)
         )
     }
 
diff --git a/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt b/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt
index 4a41afb2..5de9354b 100644
--- a/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt
+++ b/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt
@@ -52,6 +52,7 @@ import xyz.quaver.hitomi.getReader
 import xyz.quaver.pupil.BuildConfig
 import xyz.quaver.pupil.Pupil
 import xyz.quaver.pupil.R
+import xyz.quaver.pupil.favorites
 import xyz.quaver.pupil.types.Tag
 import xyz.quaver.pupil.util.GalleryList
 import xyz.quaver.pupil.util.download.Cache
@@ -68,8 +69,6 @@ class GalleryBlockAdapter(private val glide: RequestManager, private val galleri
         PREV
     }
 
-    private lateinit var favorites: GalleryList
-
     val timer = Timer()
 
     var isThin = false
@@ -257,9 +256,6 @@ class GalleryBlockAdapter(private val glide: RequestManager, private val galleri
                     }
                 }
 
-                if (!::favorites.isInitialized)
-                    favorites = (context.applicationContext as Pupil).favorites
-
                 with(galleryblock_favorite) {
                     setImageResource(if (favorites.contains(galleryBlock.id)) R.drawable.ic_star_filled else R.drawable.ic_star_empty)
                     setOnClickListener {
diff --git a/app/src/main/java/xyz/quaver/pupil/BroadcastReciever.kt b/app/src/main/java/xyz/quaver/pupil/reciever/UpdateBroadcastReciever.kt
similarity index 93%
rename from app/src/main/java/xyz/quaver/pupil/BroadcastReciever.kt
rename to app/src/main/java/xyz/quaver/pupil/reciever/UpdateBroadcastReciever.kt
index 2456da45..7787e713 100644
--- a/app/src/main/java/xyz/quaver/pupil/BroadcastReciever.kt
+++ b/app/src/main/java/xyz/quaver/pupil/reciever/UpdateBroadcastReciever.kt
@@ -16,7 +16,7 @@
  *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package xyz.quaver.pupil
+package xyz.quaver.pupil.reciever
 
 import android.app.DownloadManager
 import android.app.PendingIntent
@@ -29,15 +29,10 @@ import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationManagerCompat
 import androidx.core.content.FileProvider
 import androidx.preference.PreferenceManager
+import xyz.quaver.pupil.R
 import java.io.File
 
-class BroadcastReciever : BroadcastReceiver() {
-
-    companion object {
-        const val ACTION_CANCEL_IMPORT = "ACTION_CANCEL_IMPORT"
-
-        const val EXTRA_IMPORT_NOTIFICATION_ID = "EXTRA_IMPORT_NOTIFICATION_ID"
-    }
+class UpdateBroadcastReciever : BroadcastReceiver() {
 
     override fun onReceive(context: Context?, intent: Intent?) {
         context ?: return
diff --git a/app/src/main/java/xyz/quaver/pupil/services/DownloadService.kt b/app/src/main/java/xyz/quaver/pupil/services/DownloadService.kt
new file mode 100644
index 00000000..95212beb
--- /dev/null
+++ b/app/src/main/java/xyz/quaver/pupil/services/DownloadService.kt
@@ -0,0 +1,155 @@
+/*
+ *     Pupil, Hitomi.la viewer for Android
+ *     Copyright (C) 2020  tom5079
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package xyz.quaver.pupil.services
+
+import android.app.Service
+import android.content.Context
+import android.content.ContextWrapper
+import android.content.Intent
+import android.os.Binder
+import android.os.IBinder
+import android.util.SparseArray
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import okhttp3.Interceptor
+import okhttp3.ResponseBody
+import okio.*
+import xyz.quaver.pupil.R
+
+private typealias ProgressListener = (Any?, Long, Long, Boolean) -> Unit
+
+class Cache(context: Context) : ContextWrapper(context) {
+
+
+
+}
+
+class DownloadService : Service() {
+
+    //region Notification
+    private val notificationManager by lazy {
+        NotificationManagerCompat.from(this)
+    }
+
+    private val serviceNotification by lazy {
+        NotificationCompat.Builder(this, "downloader")
+            .setContentTitle(getString(R.string.downloader_running))
+            .setProgress(0, 0, false)
+            .setSmallIcon(R.drawable.ic_notification)
+            .setOngoing(true)
+    }
+    //endregion
+
+    //region ProgressListener
+    @Suppress("UNCHECKED_CAST")
+    private val progressListener: ProgressListener = listener@{ tag, bytesRead, contentLength, done ->
+            val (galleryID, index) = (tag as? Pair<Int, Int>) ?: return@listener
+
+            if (!done && progress[galleryID]?.get(index)?.isFinite() == true)
+                progress[galleryID]?.set(index, bytesRead * 100F / contentLength)
+    }
+
+    private class ProgressResponseBody(
+        val tag: Any?,
+        val responseBody: ResponseBody,
+        val progressListener : ProgressListener
+    ) : ResponseBody() {
+        private var bufferedSource : BufferedSource? = null
+
+        override fun contentLength() = responseBody.contentLength()
+        override fun contentType() = responseBody.contentType()
+
+        override fun source(): BufferedSource {
+            if (bufferedSource == null)
+                bufferedSource = Okio.buffer(source(responseBody.source()))
+
+            return bufferedSource!!
+        }
+
+        private fun source(source: Source) = object: ForwardingSource(source) {
+            var totalBytesRead = 0L
+
+            override fun read(sink: Buffer, byteCount: Long): Long {
+                val bytesRead = super.read(sink, byteCount)
+
+                totalBytesRead += if (bytesRead == -1L) 0L else bytesRead
+                progressListener.invoke(tag, totalBytesRead, responseBody.contentLength(), bytesRead == -1L)
+
+                return bytesRead
+            }
+        }
+    }
+
+    val interceptor = Interceptor { chain ->
+        val request = chain.request()
+        var response = chain.proceed(request)
+
+        var retry = 5
+        while (!response.isSuccessful && retry > 0) {
+            response = chain.proceed(request)
+            retry--
+        }
+
+        response.newBuilder()
+            .body(response.body()?.let {
+                ProgressResponseBody(request.tag(), it, progressListener)
+            }).build()
+    }
+    //endregion
+
+    /**
+    * KEY
+    *  primary galleryID
+    *  secondary index
+    * PRIMARY VALUE
+    *  MutableList -> Download in progress
+    *  null -> Loading / Gallery doesn't exist
+    * SECONDARY VALUE
+    *  0 <= value < 100 -> Download in progress
+    *  Float.POSITIVE_INFINITY -> Download completed
+    */
+    val progress = SparseArray<MutableList<Float>?>()
+
+    override fun onCreate() {
+        startForeground(R.id.downloader_notification_id, serviceNotification.build())
+    }
+
+    override fun onDestroy() {
+
+    }
+
+
+    inner class Binder : android.os.Binder() {
+        val service = this@DownloadService
+    }
+
+    private val binder = Binder()
+    override fun onBind(p0: Intent?) = binder
+
+    fun load(galleryID: Int) {
+        
+    }
+
+    fun download(galleryID: Int) = CoroutineScope(Dispatchers.IO).launch {
+
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt b/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt
index 51916851..3bbc8701 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt
@@ -22,7 +22,9 @@ import android.annotation.SuppressLint
 import android.app.Activity
 import android.content.Intent
 import android.graphics.drawable.Animatable
+import android.net.Proxy
 import android.net.Uri
+import android.os.Build
 import android.os.Bundle
 import android.text.*
 import android.text.style.AlignmentSpan
@@ -59,9 +61,11 @@ import xyz.quaver.hitomi.GalleryBlock
 import xyz.quaver.hitomi.doSearch
 import xyz.quaver.hitomi.getGalleryIDsFromNozomi
 import xyz.quaver.hitomi.getSuggestionsForQuery
-import xyz.quaver.pupil.Pupil
 import xyz.quaver.pupil.R
 import xyz.quaver.pupil.adapters.GalleryBlockAdapter
+import xyz.quaver.pupil.favorites
+import xyz.quaver.pupil.histories
+import xyz.quaver.pupil.services.DownloadService
 import xyz.quaver.pupil.types.TagSuggestion
 import xyz.quaver.pupil.types.Tags
 import xyz.quaver.pupil.ui.dialog.GalleryDialog
@@ -110,9 +114,6 @@ class MainActivity : AppCompatActivity() {
     private var loadingJob: Job? = null
     private var currentPage = 0
 
-    private lateinit var histories: GalleryList
-    private lateinit var favorites: GalleryList
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
@@ -147,11 +148,6 @@ class MainActivity : AppCompatActivity() {
             }
         }
 
-        with(application as Pupil) {
-            this@MainActivity.histories = histories
-            this@MainActivity.favorites = favorites
-        }
-
         if (intent.action == Intent.ACTION_VIEW) {
             intent.dataString?.let { url ->
                 restore(favorites, url,
@@ -166,6 +162,15 @@ class MainActivity : AppCompatActivity() {
 
         setContentView(R.layout.activity_main)
 
+        Intent(this, DownloadService::class.java).let {
+            when {
+                Build.VERSION.SDK_INT >= Build.VERSION_CODES.O ->
+                    startForegroundService(it)
+                else ->
+                    startService(it)
+            }
+        }
+
         checkUpdate(this)
 
         initView()
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt b/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt
index 1370b36a..dc9dbaf9 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt
@@ -46,6 +46,8 @@ import xyz.quaver.Code
 import xyz.quaver.pupil.Pupil
 import xyz.quaver.pupil.R
 import xyz.quaver.pupil.adapters.ReaderAdapter
+import xyz.quaver.pupil.favorites
+import xyz.quaver.pupil.histories
 import xyz.quaver.pupil.util.GalleryList
 import xyz.quaver.pupil.util.download.Cache
 import xyz.quaver.pupil.util.download.DownloadWorker
@@ -78,16 +80,12 @@ class ReaderActivity : AppCompatActivity() {
 
     private var menu: Menu? = null
 
-    private lateinit var favorites: GalleryList
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
         title = getString(R.string.reader_loading)
         supportActionBar?.setDisplayHomeAsUpEnabled(false)
 
-        favorites = (application as Pupil).favorites
-
         window.setFlags(
             WindowManager.LayoutParams.FLAG_SECURE,
             WindowManager.LayoutParams.FLAG_SECURE)
@@ -96,7 +94,7 @@ class ReaderActivity : AppCompatActivity() {
 
         handleIntent(intent)
 
-        (application as Pupil).histories.add(galleryID)
+        histories.add(galleryID)
         FirebaseCrashlytics.getInstance().setCustomKey("GalleryID", galleryID)
 
         if (galleryID == 0) {
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/SettingsActivity.kt b/app/src/main/java/xyz/quaver/pupil/ui/SettingsActivity.kt
index f2a43b3b..98f4f592 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/SettingsActivity.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/SettingsActivity.kt
@@ -35,6 +35,7 @@ import kotlinx.serialization.json.Json
 import net.rdrei.android.dirchooser.DirectoryChooserActivity
 import xyz.quaver.pupil.Pupil
 import xyz.quaver.pupil.R
+import xyz.quaver.pupil.favorites
 import xyz.quaver.pupil.ui.fragment.LockSettingsFragment
 import xyz.quaver.pupil.ui.fragment.SettingsFragment
 import xyz.quaver.pupil.util.*
@@ -100,7 +101,7 @@ class SettingsActivity : AppCompatActivity() {
                             inputStream.readBytes().toString(Charset.defaultCharset())
                         }
 
-                        (application as Pupil).favorites.addAll(Json.decodeFromString<List<Int>>(str).also {
+                        favorites.addAll(Json.decodeFromString<List<Int>>(str).also {
                             Snackbar.make(
                                 window.decorView,
                                 getString(R.string.settings_restore_success, it.size),
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/dialog/GalleryDialog.kt b/app/src/main/java/xyz/quaver/pupil/ui/dialog/GalleryDialog.kt
index 6f7f5775..ed2d58a7 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/dialog/GalleryDialog.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/dialog/GalleryDialog.kt
@@ -48,6 +48,7 @@ import xyz.quaver.pupil.Pupil
 import xyz.quaver.pupil.R
 import xyz.quaver.pupil.adapters.GalleryBlockAdapter
 import xyz.quaver.pupil.adapters.ThumbnailPageAdapter
+import xyz.quaver.pupil.histories
 import xyz.quaver.pupil.types.Tag
 import xyz.quaver.pupil.ui.ReaderActivity
 import xyz.quaver.pupil.util.ItemClickSupport
@@ -81,7 +82,7 @@ class GalleryDialog(context: Context, private val glide: RequestManager, private
                 context.startActivity(Intent(context, ReaderActivity::class.java).apply {
                     putExtra("galleryID", galleryID)
                 })
-                (context.applicationContext as Pupil).histories.add(galleryID)
+                histories.add(galleryID)
             }
         }
 
@@ -264,7 +265,7 @@ class GalleryDialog(context: Context, private val glide: RequestManager, private
                         context.startActivity(Intent(context, ReaderActivity::class.java).apply {
                             putExtra("galleryID", galleries[position].id)
                         })
-                        (context.applicationContext as Pupil).histories.add(galleries[position].id)
+                        histories.add(galleries[position].id)
                     }
                     onItemLongClickListener = { _, position, _ ->
                         GalleryDialog(
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/dialog/ProxyDialog.kt b/app/src/main/java/xyz/quaver/pupil/ui/dialog/ProxyDialog.kt
index 0eccffc4..275e52fb 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/dialog/ProxyDialog.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/dialog/ProxyDialog.kt
@@ -31,8 +31,10 @@ import androidx.preference.PreferenceManager
 import kotlinx.android.synthetic.main.dialog_proxy.view.*
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
-import xyz.quaver.proxy
 import xyz.quaver.pupil.R
+import xyz.quaver.pupil.client
+import xyz.quaver.pupil.clientBuilder
+import xyz.quaver.pupil.clientHolder
 import xyz.quaver.pupil.util.ProxyInfo
 import xyz.quaver.pupil.util.getProxyInfo
 import java.net.Proxy
@@ -117,12 +119,15 @@ class ProxyDialog(context: Context) : Dialog(context) {
             }
 
             ProxyInfo(type, addr, port, username, password).let {
-
                 PreferenceManager.getDefaultSharedPreferences(context).edit().putString("proxy",
                     Json.encodeToString(it)
                 ).apply()
 
-                proxy = it.proxy()
+                clientBuilder
+                    .proxy(it.proxy())
+                    .proxyAuthenticator(it.authenticator())
+                clientHolder = null
+                client
             }
 
             dismiss()
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/fragment/ManageFavoritesFragment.kt b/app/src/main/java/xyz/quaver/pupil/ui/fragment/ManageFavoritesFragment.kt
index b04222f9..8fc6b8b8 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/fragment/ManageFavoritesFragment.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/fragment/ManageFavoritesFragment.kt
@@ -30,6 +30,8 @@ import com.google.android.material.snackbar.Snackbar
 import okhttp3.*
 import xyz.quaver.pupil.Pupil
 import xyz.quaver.pupil.R
+import xyz.quaver.pupil.client
+import xyz.quaver.pupil.favorites
 import xyz.quaver.pupil.util.restore
 import java.io.File
 import java.io.IOException
@@ -52,7 +54,7 @@ class ManageFavoritesFragment : PreferenceFragmentCompat() {
                         .build()
                 ).build()
 
-            OkHttpClient().newCall(request).enqueue(object: Callback {
+            client.newCall(request).enqueue(object: Callback {
                 override fun onFailure(call: Call, e: IOException) {
                     val view = view ?: return
                     Snackbar.make(view, R.string.settings_backup_failed, Snackbar.LENGTH_LONG).show()
@@ -79,7 +81,6 @@ class ManageFavoritesFragment : PreferenceFragmentCompat() {
                 .setTitle(R.string.settings_restore_title)
                 .setView(editText)
                 .setPositiveButton(android.R.string.ok) { _, _ ->
-                    val favorites = (activity?.application as? Pupil)?.favorites ?: return@setPositiveButton
                     restore(favorites, editText.text.toString(),
                         onFailure = onFailure@{
                             val view = view ?: return@onFailure
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/fragment/SettingsFragment.kt b/app/src/main/java/xyz/quaver/pupil/ui/fragment/SettingsFragment.kt
index a486f289..fe8f4f13 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/fragment/SettingsFragment.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/fragment/SettingsFragment.kt
@@ -40,6 +40,7 @@ import net.rdrei.android.dirchooser.DirectoryChooserActivity
 import net.rdrei.android.dirchooser.DirectoryChooserConfig
 import xyz.quaver.pupil.Pupil
 import xyz.quaver.pupil.R
+import xyz.quaver.pupil.histories
 import xyz.quaver.pupil.ui.LockActivity
 import xyz.quaver.pupil.ui.SettingsActivity
 import xyz.quaver.pupil.ui.dialog.DefaultQueryDialog
@@ -143,8 +144,6 @@ class SettingsFragment :
                     }.show()
                 }
                 "clear_history" -> {
-                    val histories = (requireContext().applicationContext as Pupil).histories
-
                     AlertDialog.Builder(requireContext()).apply {
                         setTitle(R.string.warning)
                         setMessage(R.string.settings_clear_history_alert_message)
@@ -220,10 +219,10 @@ class SettingsFragment :
 
             when (key) {
                 "proxy" -> {
-                    summary = getProxyInfo(requireContext()).type.name
+                    summary = context?.let { getProxyInfo(it).type.name }
                 }
                 "dl_location" -> {
-                    summary = getDownloadDirectory(requireContext()).canonicalPath
+                    summary = context?.let { getDownloadDirectory(it).canonicalPath }
                 }
             }
         }
@@ -286,7 +285,6 @@ class SettingsFragment :
                             onPreferenceClickListener = this@SettingsFragment
                         }
                         "clear_history" -> {
-                            val histories = (requireActivity().application as Pupil).histories
                             summary = getString(R.string.settings_clear_history_summary, histories.size)
 
                             onPreferenceClickListener = this@SettingsFragment
diff --git a/app/src/main/java/xyz/quaver/pupil/util/download/Cache.kt b/app/src/main/java/xyz/quaver/pupil/util/download/Cache.kt
index ff99c185..a0011718 100644
--- a/app/src/main/java/xyz/quaver/pupil/util/download/Cache.kt
+++ b/app/src/main/java/xyz/quaver/pupil/util/download/Cache.kt
@@ -28,14 +28,13 @@ import kotlinx.coroutines.*
 import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
-import okhttp3.Dispatcher
 import xyz.quaver.Code
 import xyz.quaver.hitomi.GalleryBlock
 import xyz.quaver.hitomi.Reader
-import xyz.quaver.proxy
 import xyz.quaver.pupil.util.getCachedGallery
 import xyz.quaver.pupil.util.getDownloadDirectory
 import xyz.quaver.pupil.util.isParentOf
+import xyz.quaver.readBytes
 import java.io.BufferedInputStream
 import java.io.File
 import java.io.FileOutputStream
@@ -91,11 +90,12 @@ class Cache(context: Context) : ContextWrapper(context) {
         @Suppress("BlockingMethodInNonBlockingContext")
         val thumbnail = if (metadata?.thumbnail == null)
             withContext(Dispatchers.IO) {
-                val thumbnails = getGalleryBlock(galleryID)?.thumbnails
+                val thumbnail = getGalleryBlock(galleryID)?.thumbnails?.firstOrNull() ?: return@withContext null
                 try {
-                    Base64.encodeToString(URL(thumbnails?.firstOrNull()).openConnection(proxy).getInputStream().use {
-                        it.readBytes()
-                    }, Base64.DEFAULT)
+                    val data = URL(thumbnail).readBytes().apply {
+                        if (isEmpty()) return@withContext null
+                    }
+                    Base64.encodeToString(data, Base64.DEFAULT)
                 } catch (e: Exception) {
                     null
                 }
@@ -178,7 +178,7 @@ class Cache(context: Context) : ContextWrapper(context) {
                     retval = try {
                         withContext(Dispatchers.IO) {
                             withTimeoutOrNull(1000) {
-                                    source.value.invoke()
+                                source.value.invoke()
                             }
                         }
                     } catch (e: Exception) {
diff --git a/app/src/main/java/xyz/quaver/pupil/util/download/DownloadWorker.kt b/app/src/main/java/xyz/quaver/pupil/util/download/DownloadWorker.kt
index 264bdf3a..cbc07dc3 100644
--- a/app/src/main/java/xyz/quaver/pupil/util/download/DownloadWorker.kt
+++ b/app/src/main/java/xyz/quaver/pupil/util/download/DownloadWorker.kt
@@ -40,13 +40,13 @@ import xyz.quaver.hitomi.imageUrlFromImage
 import xyz.quaver.hiyobi.cookie
 import xyz.quaver.hiyobi.createImgList
 import xyz.quaver.hiyobi.user_agent
-import xyz.quaver.proxy
 import xyz.quaver.pupil.R
+import xyz.quaver.pupil.client
+import xyz.quaver.pupil.interceptors
 import xyz.quaver.pupil.ui.ReaderActivity
 import java.io.File
 import java.io.IOException
 import java.util.concurrent.LinkedBlockingQueue
-import java.util.concurrent.TimeUnit
 
 @OptIn(ExperimentalCoroutinesApi::class)
 class DownloadWorker private constructor(context: Context) : ContextWrapper(context) {
@@ -86,7 +86,6 @@ class DownloadWorker private constructor(context: Context) : ContextWrapper(cont
         }
 
         private fun source(source: Source) = object: ForwardingSource(source) {
-
             var totalBytesRead = 0L
 
             override fun read(sink: Buffer, byteCount: Long): Long {
@@ -100,6 +99,24 @@ class DownloadWorker private constructor(context: Context) : ContextWrapper(cont
 
         }
     }
+
+    init {
+        interceptors[Pair::class] =  { chain ->
+            val request = chain.request()
+            var response = chain.proceed(request)
+
+            var retry = 5
+            while (!response.isSuccessful && retry > 0) {
+                response = chain.proceed(request)
+                retry--
+            }
+
+            response.newBuilder()
+                .body(response.body()?.let {
+                    ProgressResponseBody(request.tag(), it, progressListener)
+                }).build()
+        }
+    }
     //endregion
 
     //region Singleton
@@ -135,34 +152,6 @@ class DownloadWorker private constructor(context: Context) : ContextWrapper(cont
     private val loop = loop()
     private val worker = SparseArray<Job?>()
 
-    val interceptor = Interceptor { chain ->
-        val request = chain.request()
-        var response = chain.proceed(request)
-
-        var retry = 5
-        while (!response.isSuccessful && retry > 0) {
-            response = chain.proceed(request)
-            retry--
-        }
-
-        response.newBuilder()
-            .body(response.body()?.let {
-                ProgressResponseBody(request.tag(), it, progressListener)
-            }).build()
-    }
-
-    val client : OkHttpClient =
-        OkHttpClient.Builder()
-            .connectTimeout(0, TimeUnit.SECONDS)
-            .addInterceptor(interceptor)
-            .readTimeout(0, TimeUnit.SECONDS)
-            .dispatcher(Dispatcher().apply {
-                maxRequests = 4
-                maxRequestsPerHost = 4
-            })
-            .proxy(proxy)
-            .build()
-
     fun stop() {
         queue.clear()
 
@@ -300,8 +289,8 @@ class DownloadWorker private constructor(context: Context) : ContextWrapper(cont
                     val ext = call.request().url().encodedPath().split('.').last()
 
                     try {
-                        response.body().use {
-                            Cache(this@DownloadWorker).putImage(galleryID, i, ext, it!!.byteStream())
+                        response.body()!!.use {
+                            Cache(this@DownloadWorker).putImage(galleryID, i, ext, it.byteStream())
                         }
                         progress[galleryID]?.set(i, Float.POSITIVE_INFINITY)
 
diff --git a/app/src/main/java/xyz/quaver/pupil/util/misc.kt b/app/src/main/java/xyz/quaver/pupil/util/misc.kt
index ecbb908b..9beb641a 100644
--- a/app/src/main/java/xyz/quaver/pupil/util/misc.kt
+++ b/app/src/main/java/xyz/quaver/pupil/util/misc.kt
@@ -53,7 +53,7 @@ fun byteToString(byte: Long, precision : Int = 1) : String {
 
 }
 
-/*
+/**
  * Convert android generated ID to requestCode
  * to prevent java.lang.IllegalArgumentException: Can only use lower 16 bits for requestCode
  *
diff --git a/app/src/main/java/xyz/quaver/pupil/util/proxy.kt b/app/src/main/java/xyz/quaver/pupil/util/proxy.kt
index b6dc406d..061fc280 100644
--- a/app/src/main/java/xyz/quaver/pupil/util/proxy.kt
+++ b/app/src/main/java/xyz/quaver/pupil/util/proxy.kt
@@ -23,8 +23,7 @@ import androidx.preference.PreferenceManager
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.json.Json
-import okhttp3.Authenticator
-import okhttp3.Credentials
+import okhttp3.*
 import java.net.InetSocketAddress
 import java.net.Proxy
 
diff --git a/app/src/main/java/xyz/quaver/pupil/util/update.kt b/app/src/main/java/xyz/quaver/pupil/util/update.kt
index 02424fb8..3efaa876 100644
--- a/app/src/main/java/xyz/quaver/pupil/util/update.kt
+++ b/app/src/main/java/xyz/quaver/pupil/util/update.kt
@@ -35,6 +35,7 @@ import okhttp3.*
 import ru.noties.markwon.Markwon
 import xyz.quaver.pupil.BuildConfig
 import xyz.quaver.pupil.R
+import xyz.quaver.pupil.client
 import java.io.File
 import java.io.IOException
 import java.net.URL
@@ -187,7 +188,7 @@ fun restore(favorites: GalleryList, url: String, onFailure: ((Exception) -> Unit
         .get()
         .build()
 
-    OkHttpClient().newCall(request).enqueue(object: Callback {
+    client.newCall(request).enqueue(object: Callback {
         override fun onFailure(call: Call, e: IOException) {
             onFailure?.invoke(e)
         }
diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index fb8e76bd..e6309d0f 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -140,4 +140,7 @@
     <string name="settings_manage_favorites">ブックマーク管理</string>
     <string name="settings_backup_failed">エラーが発生しました</string>
     <string name="settings_backup_share">バックアップ共有</string>
+    <string name="channel_downloader">ダウンローダ</string>
+    <string name="channel_downloader_description">ダウンローダの状態を表示</string>
+    <string name="downloader_running">ダウンローダー起動中</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-ko/strings.xml b/app/src/main/res/values-ko/strings.xml
index dcd8e9da..b29c0d3a 100644
--- a/app/src/main/res/values-ko/strings.xml
+++ b/app/src/main/res/values-ko/strings.xml
@@ -140,4 +140,7 @@
     <string name="settings_manage_favorites">즐겨찾기 관리</string>
     <string name="settings_backup_failed">업로드 실패</string>
     <string name="settings_backup_share">백업 공유</string>
+    <string name="channel_downloader">다운로더</string>
+    <string name="channel_downloader_description">다운로더 작동 여부 표시</string>
+    <string name="downloader_running">다운로더 작동중…</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/ids.xml b/app/src/main/res/values/ids.xml
index 5a1d51a9..7e73441a 100644
--- a/app/src/main/res/values/ids.xml
+++ b/app/src/main/res/values/ids.xml
@@ -10,4 +10,7 @@
     <item name="request_write_permission_and_saf" type="id" />
 
     <item name="notification_id_update" type="id" />
+
+    <item name="downloader_notification_id" type="id" />
+    <item name="downloader_notification_request" type="id" />
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 4c97916b..61e7191a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -29,6 +29,9 @@
     <string name="channel_download">Download</string>
     <string name="channel_download_description">Shows download status</string>
 
+    <string name="channel_downloader">Downloader</string>
+    <string name="channel_downloader_description">Shows downloader status</string>
+
     <string name="channel_update">Update</string>
     <string name="channel_update_description">Shows update progress</string>
 
@@ -103,6 +106,9 @@
     <string name="reader_notification_text">Downloading&#8230;</string>
     <string name="reader_notification_complete">Download complete</string>
 
+    <!-- DOWNLOADER -->
+    <string name="downloader_running">Downloader running…</string>
+
     <!-- SETTINGS -->
 
     <string name="settings_title">Settings</string>