Deeplink into chapters for a few sources

So far just mangadex, jamini's, mangaplus, kireicake

app/src/main/AndroidManifest.xml

@@ -55,8 +55,35 @@
             </intent-filter>
             <meta-data android:name="android.app.searchable" android:resource="@xml/searchable"/>
         </activity>
-        <activity
-            android:name=".ui.reader.ReaderActivity" />
+        <activity android:name=".ui.reader.ReaderActivity"
+            android:theme="@style/Theme.Splash">
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data
+                    android:host="reader.kireicake.com"
+                    android:pathPattern="/read/..*/..*/..*/..*"
+                    android:scheme="https" />
+
+                <data
+                    android:host="jaiminisbox.com"
+                    android:pathPattern="/reader/read/..*/..*/..*/..*"
+                    android:scheme="https" />
+
+                <data
+                    android:host="mangadex.org"
+                    android:pathPattern="/chapter/..*"
+                    android:scheme="https" />
+
+                <data
+                    android:host="mangaplus.shueisha.co.jp"
+                    android:pathPattern="/viewer/..*"
+                    android:scheme="https" />
+            </intent-filter>
+        </activity>
         <activity
             android:name=".ui.webview.WebViewActivity"
             android:configChanges="uiMode|orientation|screenSize"/>

app/src/main/java/eu/kanade/tachiyomi/data/database/queries/ChapterQueries.kt

@@ -65,6 +65,15 @@ interface ChapterQueries : DbProvider {
                     .build())
             .prepare()
 
+    fun getChapters(url: String) = db.get()
+        .listOfObjects(Chapter::class.java)
+        .withQuery(Query.builder()
+            .table(ChapterTable.TABLE)
+            .where("${ChapterTable.COL_URL} = ?")
+            .whereArgs(url)
+            .build())
+        .prepare()
+
     fun getChapter(url: String, mangaId: Long) = db.get()
         .`object`(Chapter::class.java)
         .withQuery(Query.builder()

app/src/main/java/eu/kanade/tachiyomi/source/SourceManager.kt

@@ -5,7 +5,12 @@ import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
+import eu.kanade.tachiyomi.source.online.DelegatedHttpSource
 import eu.kanade.tachiyomi.source.online.HttpSource
+import eu.kanade.tachiyomi.source.online.all.MangaDex
+import eu.kanade.tachiyomi.source.online.english.FoolSlide
+import eu.kanade.tachiyomi.source.online.english.KireiCake
+import eu.kanade.tachiyomi.source.online.english.MangaPlus
 import rx.Observable
 
 open class SourceManager(private val context: Context) {
@@ -14,6 +19,18 @@ open class SourceManager(private val context: Context) {
 
     private val stubSourcesMap = mutableMapOf<Long, StubSource>()
 
+    private val delegatedSources = listOf(
+        DelegatedSource(
+            "reader.kireicake.com", 5509224355268673176, KireiCake()
+        ), DelegatedSource(
+            "jaiminisbox.com", 9064882169246918586, FoolSlide("jaiminis", "/reader")
+        ), DelegatedSource(
+            "mangadex.org", 2499283573021220255, MangaDex()
+        ), DelegatedSource(
+            "mangaplus.shueisha.co.jp", 1998944621602463790, MangaPlus()
+        )
+    ).associateBy { it.sourceId }
+
     init {
         createInternalSources().forEach { registerSource(it) }
     }
@@ -28,12 +45,17 @@ open class SourceManager(private val context: Context) {
         }
     }
 
+    fun getDelegatedSource(urlName: String): DelegatedHttpSource? {
+        return delegatedSources.values.find { it.urlName == urlName }?.delegatedHttpSource
+    }
+
     fun getOnlineSources() = sourcesMap.values.filterIsInstance<HttpSource>()
 
     fun getCatalogueSources() = sourcesMap.values.filterIsInstance<CatalogueSource>()
 
     internal fun registerSource(source: Source, overwrite: Boolean = false) {
         if (overwrite || !sourcesMap.containsKey(source.id)) {
+            delegatedSources[source.id]?.delegatedHttpSource?.delegate = source as? HttpSource
             sourcesMap[source.id] = source
         }
     }
@@ -68,14 +90,23 @@ open class SourceManager(private val context: Context) {
         }
 
         private fun getSourceNotInstalledException(): Exception {
-            return SourceNotFoundException(context.getString(R.string.source_not_installed_, id
-                .toString()), id)
+            return SourceNotFoundException(
+                context.getString(
+                    R.string.source_not_installed_, id.toString()
+                ), id
+            )
         }
 
         override fun hashCode(): Int {
             return id.hashCode()
         }
     }
+
+    private data class DelegatedSource(
+        val urlName: String,
+        val sourceId: Long,
+        val delegatedHttpSource: DelegatedHttpSource
+    )
 }
 
 class SourceNotFoundException(message: String, val id: Long) : Exception(message)

app/src/main/java/eu/kanade/tachiyomi/source/model/SChapter.kt

@@ -1,5 +1,6 @@
 package eu.kanade.tachiyomi.source.model
 
+import eu.kanade.tachiyomi.data.database.models.ChapterImpl
 import java.io.Serializable
 
 interface SChapter : Serializable {
@@ -22,6 +23,16 @@ interface SChapter : Serializable {
         scanlator = other.scanlator
     }
 
+    fun toChapter(): ChapterImpl {
+        return ChapterImpl().apply {
+            name = this@SChapter.name
+            url = this@SChapter.url
+            date_upload = this@SChapter.date_upload
+            chapter_number = this@SChapter.chapter_number
+            scanlator = this@SChapter.scanlator
+        }
+    }
+
     companion object {
         fun create(): SChapter {
             return SChapterImpl()

app/src/main/java/eu/kanade/tachiyomi/source/online/DelegatedHttpSource.kt

@@ -0,0 +1,45 @@
+package eu.kanade.tachiyomi.source.online
+
+import android.net.Uri
+import eu.kanade.tachiyomi.data.database.DatabaseHelper
+import eu.kanade.tachiyomi.data.database.models.Chapter
+import eu.kanade.tachiyomi.data.database.models.Manga
+import eu.kanade.tachiyomi.data.database.models.MangaImpl
+import eu.kanade.tachiyomi.network.NetworkHelper
+import eu.kanade.tachiyomi.source.fetchChapterListAsync
+import eu.kanade.tachiyomi.source.model.SChapter
+import uy.kohesive.injekt.injectLazy
+
+abstract class DelegatedHttpSource {
+
+    var delegate: HttpSource? = null
+    abstract val domainName: String
+
+    protected val db: DatabaseHelper by injectLazy()
+
+    protected val network: NetworkHelper by injectLazy()
+
+    abstract fun canOpenUrl(uri: Uri): Boolean
+    abstract fun chapterUrl(uri: Uri): String?
+    open fun pageNumber(uri: Uri): Int? = uri.pathSegments.lastOrNull()?.toIntOrNull()
+    abstract suspend fun fetchMangaFromChapterUrl(uri: Uri): Triple<Chapter, Manga, List<SChapter>>?
+
+    protected open fun getMangaInfo(url: String): Manga? {
+        val id = delegate?.id ?: return null
+        val manga = Manga.create(url, "", id)
+        val networkManga = delegate?.fetchMangaDetails(manga)?.toBlocking()?.single() ?: return null
+        val newManga = MangaImpl().apply {
+            this.url = url
+            title = try { networkManga.title } catch (e: Exception) { "" }
+            source = id
+        }
+        newManga.copyFrom(networkManga)
+        return newManga
+    }
+
+    suspend fun getChapters(url: String): List<SChapter>? {
+        val id = delegate?.id ?: return null
+        val manga = Manga.create(url, "", id)
+        return delegate?.fetchChapterListAsync(manga)
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/source/online/all/MangaDex.kt

@@ -0,0 +1,105 @@
+package eu.kanade.tachiyomi.source.online.all
+
+import android.net.Uri
+import com.github.salomonbrys.kotson.nullInt
+import com.github.salomonbrys.kotson.nullString
+import com.github.salomonbrys.kotson.obj
+import com.google.gson.JsonParser
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.data.database.models.Chapter
+import eu.kanade.tachiyomi.data.database.models.Manga
+import eu.kanade.tachiyomi.data.preference.PreferencesHelper
+import eu.kanade.tachiyomi.network.GET
+import eu.kanade.tachiyomi.network.await
+import eu.kanade.tachiyomi.source.SourceManager
+import eu.kanade.tachiyomi.source.model.SChapter
+import eu.kanade.tachiyomi.source.online.DelegatedHttpSource
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.withContext
+import okhttp3.CacheControl
+import uy.kohesive.injekt.Injekt
+import uy.kohesive.injekt.api.get
+import uy.kohesive.injekt.injectLazy
+
+class MangaDex : DelegatedHttpSource() {
+
+    override val domainName: String = "mangadex"
+
+    val sourceManager: SourceManager by injectLazy()
+
+    override fun canOpenUrl(uri: Uri): Boolean {
+        return uri.pathSegments?.lastOrNull() != "comments"
+    }
+
+    override fun chapterUrl(uri: Uri): String? {
+        val chapterNumber = uri.pathSegments.getOrNull(1) ?: return null
+        return "/api/chapter/$chapterNumber"
+    }
+
+    override fun pageNumber(uri: Uri): Int? {
+        return uri.pathSegments.getOrNull(2)?.toIntOrNull()
+    }
+
+    override suspend fun fetchMangaFromChapterUrl(uri: Uri): Triple<Chapter, Manga, List<SChapter>>? {
+        val url = chapterUrl(uri) ?: return null
+        val request =
+            GET("https://mangadex.org$url", delegate!!.headers, CacheControl.FORCE_NETWORK)
+        val response = network.client.newCall(request).await()
+        if (response.code != 200) throw Exception("HTTP error ${response.code}")
+        val body = response.body?.string().orEmpty()
+        if (body.isEmpty()) {
+            throw Exception("Null Response")
+        }
+
+        val jsonObject = JsonParser.parseString(body).obj
+        val mangaId = jsonObject["manga_id"]?.nullInt ?: throw Exception(
+            "No manga associated with chapter"
+        )
+        val langCode = getRealLangCode(jsonObject["lang_code"]?.nullString ?: "en").toUpperCase()
+        // Use the correct MangaDex source based on the language code, or the api will not return
+        // the correct chapter list
+        delegate = sourceManager.getOnlineSources().find { it.toString() == "MangaDex ($langCode)" }
+            ?: return error("Source not found")
+        val mangaUrl = "/manga/$mangaId/"
+        return withContext(Dispatchers.IO) {
+            val deferredManga = async {
+                db.getManga(mangaUrl, delegate?.id!!).executeAsBlocking() ?: getMangaInfo(mangaUrl)
+            }
+            val deferredChapters = async { getChapters(mangaUrl) }
+            val manga = deferredManga.await()
+            val chapters = deferredChapters.await()
+            val context = Injekt.get<PreferencesHelper>().context
+            val trueChapter = chapters?.find { it.url == url }?.toChapter() ?: error(
+                context.getString(R.string.chapter_not_found)
+            )
+            if (manga != null) {
+                Triple(trueChapter, manga, chapters.orEmpty())
+            } else null
+        }
+    }
+
+    fun getRealLangCode(langCode: String): String {
+        return when (langCode.toLowerCase()) {
+            "gb" -> "en"
+            "vn" -> "vi"
+            "mx" -> "es-419"
+            "br" -> "pt-BR"
+            "ph" -> "fil"
+            "sa" -> "ar"
+            "bd" -> "bn"
+            "mm" -> "my"
+            "cz" -> "cs"
+            "dk" -> "da"
+            "gr" -> "el"
+            "jp" -> "ja"
+            "kr" -> "ko"
+            "my" -> "ms"
+            "ir" -> "fa"
+            "rs" -> "sh"
+            "ua" -> "uk"
+            "cn" -> "zh-Hans" "hk" -> "zh-Hant"
+            else -> langCode
+        }
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/source/online/english/FoolSlide.kt

@@ -0,0 +1,102 @@
+package eu.kanade.tachiyomi.source.online.english
+
+import android.net.Uri
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.data.database.models.Chapter
+import eu.kanade.tachiyomi.data.database.models.Manga
+import eu.kanade.tachiyomi.data.database.models.MangaImpl
+import eu.kanade.tachiyomi.data.preference.PreferencesHelper
+import eu.kanade.tachiyomi.network.GET
+import eu.kanade.tachiyomi.network.POST
+import eu.kanade.tachiyomi.network.await
+import eu.kanade.tachiyomi.source.model.SChapter
+import eu.kanade.tachiyomi.source.online.DelegatedHttpSource
+import eu.kanade.tachiyomi.util.asJsoup
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.withContext
+import okhttp3.FormBody
+import okhttp3.Request
+import uy.kohesive.injekt.Injekt
+import uy.kohesive.injekt.api.get
+
+open class FoolSlide(override val domainName: String, private val urlModifier: String = "") :
+DelegatedHttpSource
+    () {
+
+    override fun canOpenUrl(uri: Uri): Boolean = true
+
+    override fun chapterUrl(uri: Uri): String? {
+        val offset = if (urlModifier.isEmpty()) 0 else 1
+        val mangaName = uri.pathSegments.getOrNull(1 + offset) ?: return null
+        val lang = uri.pathSegments.getOrNull(2 + offset) ?: return null
+        val volume = uri.pathSegments.getOrNull(3 + offset) ?: return null
+        val chapterNumber = uri.pathSegments.getOrNull(4 + offset) ?: return null
+        val subChapterNumber = uri.pathSegments.getOrNull(5 + offset)?.toIntOrNull()?.toString()
+        return "$urlModifier/read/" + listOfNotNull(
+            mangaName, lang, volume, chapterNumber, subChapterNumber
+        ).joinToString("/") + "/"
+    }
+
+    override fun pageNumber(uri: Uri): Int? {
+        val count = uri.pathSegments.count()
+        if (count > 2 && uri.pathSegments[count - 2] == "page") {
+            return super.pageNumber(uri)
+        }
+        return null
+    }
+
+    override suspend fun fetchMangaFromChapterUrl(uri: Uri): Triple<Chapter, Manga, List<SChapter>>? {
+        val offset = if (urlModifier.isEmpty()) 0 else 1
+        val mangaName = uri.pathSegments.getOrNull(1 + offset) ?: return null
+        var chapterNumber = uri.pathSegments.getOrNull(4 + offset) ?: return null
+        val subChapterNumber = uri.pathSegments.getOrNull(5 + offset)?.toIntOrNull()
+        if (subChapterNumber != null) {
+            chapterNumber += ".$subChapterNumber"
+        }
+        return withContext(Dispatchers.IO) {
+            val mangaUrl = "$urlModifier/series/$mangaName/"
+            val sourceId = delegate?.id ?: return@withContext null
+            val dbManga = db.getManga(mangaUrl, sourceId).executeAsBlocking()
+            val deferredManga = async {
+                dbManga ?: getManga(mangaUrl)
+            }
+            val chapterUrl = chapterUrl(uri)
+            val deferredChapters = async { getChapters(mangaUrl) }
+            val manga = deferredManga.await()
+            val chapters = deferredChapters.await()
+            val context = Injekt.get<PreferencesHelper>().context
+            val trueChapter = chapters?.find { it.url == chapterUrl }?.toChapter() ?: error(
+                context.getString(R.string.chapter_not_found)
+            )
+            if (manga != null) Triple(trueChapter, manga, chapters) else null
+        }
+    }
+
+    open suspend fun getManga(url: String): Manga? {
+        val request = GET("${delegate!!.baseUrl}$url")
+        val document = network.client.newCall(allowAdult(request)).await().asJsoup()
+        val mangaDetailsInfoSelector = "div.info"
+        val infoElement = document.select(mangaDetailsInfoSelector).first().text()
+        return MangaImpl().apply {
+            this.url = url
+            source = delegate?.id ?: -1
+            title = infoElement.substringAfter("Title:").substringBefore("Author:").trim()
+            author = infoElement.substringAfter("Author:").substringBefore("Artist:").trim()
+            artist = infoElement.substringAfter("Artist:").substringBefore("Synopsis:").trim()
+            description = infoElement.substringAfter("Synopsis:").trim()
+            thumbnail_url = document.select("div.thumbnail img").firstOrNull()?.attr("abs:src")?.trim()
+        }
+    }
+
+    /**
+     * Transform a GET request into a POST request that automatically authorizes all adult content
+     */
+    private fun allowAdult(request: Request) = allowAdult(request.url.toString())
+
+    private fun allowAdult(url: String): Request {
+        return POST(url, body = FormBody.Builder()
+            .add("adult", "true")
+            .build())
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/source/online/english/KireiCake.kt

@@ -0,0 +1,29 @@
+package eu.kanade.tachiyomi.source.online.english
+
+import eu.kanade.tachiyomi.data.database.models.Manga
+import eu.kanade.tachiyomi.data.database.models.MangaImpl
+import eu.kanade.tachiyomi.network.GET
+import eu.kanade.tachiyomi.network.await
+import eu.kanade.tachiyomi.util.asJsoup
+import eu.kanade.tachiyomi.util.lang.capitalizeWords
+
+class KireiCake : FoolSlide("kireicake") {
+
+    override suspend fun getManga(url: String): Manga? {
+        val request = GET("${delegate!!.baseUrl}$url")
+        val document = network.client.newCall(request).await().asJsoup()
+        val mangaDetailsInfoSelector = "div.info"
+        return MangaImpl().apply {
+            this.url = url
+            source = delegate?.id ?: -1
+            title = document.select("$mangaDetailsInfoSelector li:has(b:contains(title))").first()
+                ?.ownText()?.substringAfter(":")?.trim() ?: url.split("/").last().replace(
+                "_", " " + ""
+            ).capitalizeWords()
+            description =
+                document.select("$mangaDetailsInfoSelector li:has(b:contains(description))").first()
+                    ?.ownText()?.substringAfter(":")
+            thumbnail_url = document.select("div.thumbnail img").firstOrNull()?.attr("abs:src")
+        }
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/source/online/english/MangaPlus.kt

@@ -0,0 +1,70 @@
+package eu.kanade.tachiyomi.source.online.english
+
+import android.net.Uri
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.data.database.models.Chapter
+import eu.kanade.tachiyomi.data.database.models.Manga
+import eu.kanade.tachiyomi.data.preference.PreferencesHelper
+import eu.kanade.tachiyomi.network.GET
+import eu.kanade.tachiyomi.network.await
+import eu.kanade.tachiyomi.source.model.SChapter
+import eu.kanade.tachiyomi.source.online.DelegatedHttpSource
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.withContext
+import okhttp3.CacheControl
+import uy.kohesive.injekt.Injekt
+import uy.kohesive.injekt.api.get
+
+class MangaPlus : DelegatedHttpSource() {
+    override val domainName: String = "jumpg-webapi.tokyo-cdn"
+
+    private val titleIdRegex =
+        Regex("https:\\/\\/mangaplus\\.shueisha\\.co\\.jp\\/drm\\/title\\/\\d*")
+    private val titleRegex = Regex("#MANGA_Plus .*\u0012")
+
+    private val chapterUrlTemplate =
+        "https://jumpg-webapi.tokyo-cdn.com/api/manga_viewer?chapter_id=##&split=no&img_quality=low"
+
+    override fun canOpenUrl(uri: Uri): Boolean = true
+
+    override fun chapterUrl(uri: Uri): String? = "#/viewer/${uri.pathSegments[1]}"
+
+    override fun pageNumber(uri: Uri): Int? = null
+
+    override suspend fun fetchMangaFromChapterUrl(uri: Uri): Triple<Chapter, Manga, List<SChapter>>? {
+        val url = chapterUrl(uri) ?: return null
+        val request = GET(
+            chapterUrlTemplate.replace("##", uri.pathSegments[1]),
+            delegate!!.headers,
+            CacheControl.FORCE_NETWORK
+        )
+        return withContext(Dispatchers.IO) {
+            val response = network.client.newCall(request).await()
+            if (response.code != 200) throw Exception("HTTP error ${response.code}")
+            val body = response.body!!.string()
+            val match = titleIdRegex.find(body)
+            val titleId = match?.groupValues?.firstOrNull()?.substringAfterLast("/")
+                ?: error("Title not found")
+            val title = titleRegex.find(body)?.groups?.firstOrNull()?.value?.substringAfter("Plus ")
+                ?: error("Title not found")
+            val trimmedTitle = title.substring(0, title.length - 1)
+            val mangaUrl = "#/titles/$titleId"
+            val deferredManga = async {
+                db.getManga(mangaUrl, delegate?.id!!).executeAsBlocking() ?: getMangaInfo(mangaUrl)
+            }
+            val deferredChapters = async { getChapters(mangaUrl) }
+            val manga = deferredManga.await()
+            val chapters = deferredChapters.await()
+            val context = Injekt.get<PreferencesHelper>().context
+            val trueChapter = chapters?.find { it.url == url }?.toChapter() ?: error(
+                context.getString(R.string.chapter_not_found)
+            )
+            if (manga != null) {
+                Triple(trueChapter, manga.apply {
+                    this.title = trimmedTitle
+                }, chapters.orEmpty())
+            } else null
+        }
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt

@@ -35,6 +35,7 @@ import eu.kanade.tachiyomi.data.preference.PreferencesHelper
 import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.ui.base.MaterialMenuSheet
 import eu.kanade.tachiyomi.ui.base.activity.BaseRxActivity
+import eu.kanade.tachiyomi.ui.main.MainActivity
 import eu.kanade.tachiyomi.ui.main.SearchActivity
 import eu.kanade.tachiyomi.ui.reader.ReaderPresenter.SetAsCoverResult.AddToLibraryFirst
 import eu.kanade.tachiyomi.ui.reader.ReaderPresenter.SetAsCoverResult.Error
@@ -57,6 +58,7 @@ import eu.kanade.tachiyomi.util.system.getResourceColor
 import eu.kanade.tachiyomi.util.system.hasSideNavBar
 import eu.kanade.tachiyomi.util.system.isBottomTappable
 import eu.kanade.tachiyomi.util.system.launchUI
+import eu.kanade.tachiyomi.util.system.openInBrowser
 import eu.kanade.tachiyomi.util.system.toast
 import eu.kanade.tachiyomi.util.view.collapse
 import eu.kanade.tachiyomi.util.view.doOnApplyWindowInsets
@@ -71,12 +73,15 @@ import eu.kanade.tachiyomi.widget.SimpleAnimationListener
 import eu.kanade.tachiyomi.widget.SimpleSeekBarListener
 import kotlinx.android.synthetic.main.reader_activity.*
 import kotlinx.android.synthetic.main.reader_chapters_sheet.*
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.drop
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.flow.sample
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import me.zhanghai.android.systemuihelper.SystemUiHelper
 import nucleus.factory.RequiresPresenter
 import timber.log.Timber
@@ -125,6 +130,8 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>(),
 
     private var coroutine: Job? = null
 
+    var fromUrl = false
+
     /**
      * System UI helper to hide status & navigation bar on all different API levels.
      */
@@ -152,6 +159,8 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>(),
 
     private var snackbar: Snackbar? = null
 
+    var intentPageNumber: Int? = null
+
     companion object {
         @Suppress("unused")
         const val LEFT_TO_RIGHT = 1
@@ -192,6 +201,8 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>(),
         }
 
         if (presenter.needsInit()) {
+            fromUrl = handleIntentAction(intent)
+            if (!fromUrl) {
                 val manga = intent.extras!!.getLong("manga", -1)
                 val chapter = intent.extras!!.getLong("chapter", -1)
                 if (manga == -1L || chapter == -1L) {
@@ -199,6 +210,9 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>(),
                     return
                 }
                 presenter.init(manga, chapter)
+            } else {
+                please_wait.visible()
+            }
         }
 
         if (savedInstanceState != null) {
@@ -282,6 +296,19 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>(),
         return true
     }
 
+    private fun popToMain() {
+        presenter.onBackPressed()
+        if (fromUrl) {
+            val intent = Intent(this, MainActivity::class.java).apply {
+                flags = Intent.FLAG_ACTIVITY_NEW_TASK
+            }
+            startActivity(intent)
+            finishAfterTransition()
+        } else {
+            finish()
+        }
+    }
+
     /**
      * Called when the user clicks the back key or the button on the toolbar. The call is
      * delegated to the presenter.
@@ -292,7 +319,7 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>(),
             return
         }
         presenter.onBackPressed()
-        super.onBackPressed()
+        finish()
     }
 
     /**
@@ -325,7 +352,7 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>(),
         window.statusBarColor = Color.TRANSPARENT
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
         toolbar.setNavigationOnClickListener {
-            onBackPressed()
+            popToMain()
         }
 
         toolbar.setOnClickListener {
@@ -505,6 +532,8 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>(),
     fun setChapters(viewerChapters: ViewerChapters) {
         please_wait.gone()
         viewer?.setChapters(viewerChapters)
+        intentPageNumber?.let { moveToPageIndex(it) }
+        intentPageNumber = null
         toolbar.subtitle = viewerChapters.currChapter.chapter.name
     }
 
@@ -762,6 +791,27 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>(),
         }
     }
 
+    private fun handleIntentAction(intent: Intent): Boolean {
+        val uri = intent.data ?: return false
+        if (!presenter.canLoadUrl(uri)) {
+            openInBrowser(intent.data!!.toString(), true)
+            finishAfterTransition()
+            return true
+        }
+        setMenuVisibility(visible = false, animate = true)
+        scope.launch(Dispatchers.IO) {
+            try {
+                intentPageNumber = presenter.intentPageNumber(uri)
+                presenter.loadChapterURL(uri)
+            } catch (e: Exception) {
+                withContext(Dispatchers.Main) {
+                    setInitialChapterError(e)
+                }
+            }
+        }
+        return true
+    }
+
     fun openMangaInBrowser() {
         val source = presenter.getSource() ?: return
         val url = try {

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt

@@ -1,6 +1,7 @@
 package eu.kanade.tachiyomi.ui.reader
 
 import android.app.Application
+import android.net.Uri
 import android.os.Bundle
 import android.os.Environment
 import com.jakewharton.rxrelay.BehaviorRelay
@@ -27,8 +28,10 @@ import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
 import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
 import eu.kanade.tachiyomi.util.chapter.ChapterFilter
+import eu.kanade.tachiyomi.util.chapter.syncChaptersWithSource
 import eu.kanade.tachiyomi.util.storage.DiskUtil
 import eu.kanade.tachiyomi.util.system.ImageUtil
+import eu.kanade.tachiyomi.util.system.executeOnIO
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
@@ -288,6 +291,68 @@ class ReaderPresenter(
             }
     }
 
+    fun canLoadUrl(uri: Uri): Boolean {
+        val host = uri.host ?: return false
+        val delegatedSource = sourceManager.getDelegatedSource(host) ?: return false
+        return delegatedSource.canOpenUrl(uri)
+    }
+
+    fun intentPageNumber(url: Uri): Int? {
+        val host = url.host ?: return null
+        val delegatedSource = sourceManager.getDelegatedSource(host) ?: error(
+            preferences.context.getString(R.string.source_not_installed)
+        )
+        return delegatedSource.pageNumber(url)?.minus(1)
+    }
+
+    suspend fun loadChapterURL(url: Uri) {
+        val host = url.host ?: return
+        val delegatedSource = sourceManager.getDelegatedSource(host) ?: error(
+            preferences.context.getString(R.string.source_not_installed)
+        )
+        val chapterUrl = delegatedSource.chapterUrl(url)
+        val sourceId = delegatedSource.delegate?.id ?: error(
+            preferences.context.getString(R.string.source_not_installed)
+        )
+        if (chapterUrl != null) {
+            val dbChapter = db.getChapters(chapterUrl).executeOnIO().find {
+                val source = db.getManga(it.manga_id!!).executeOnIO()?.source ?: return@find false
+                if (source == sourceId) {
+                    true
+                } else {
+                    val httpSource = sourceManager.getOrStub(source) as? HttpSource
+                    val host = delegatedSource.domainName
+                    httpSource?.baseUrl?.contains(host) == true
+                }
+            }
+            if (dbChapter?.manga_id != null) {
+                val dbManga = db.getManga(dbChapter.manga_id!!).executeOnIO()
+                if (dbManga != null) {
+                    withContext(Dispatchers.Main) {
+                        init(dbManga, dbChapter.id!!)
+                    }
+                    return
+                }
+            }
+        }
+        val info = delegatedSource.fetchMangaFromChapterUrl(url)
+        if (info != null) {
+            val (chapter, manga, chapters) = info
+            val id = db.insertManga(manga).executeOnIO().insertedId()
+            manga.id = id ?: manga.id
+            chapter.manga_id = manga.id
+            val chapterId = db.insertChapter(chapter).executeOnIO().insertedId() ?: return
+            if (chapters.isNotEmpty()) {
+                syncChaptersWithSource(
+                    db, chapters, manga, delegatedSource.delegate!!
+                )
+            }
+            withContext(Dispatchers.Main) {
+                init(manga, chapterId)
+            }
+        } else error(preferences.context.getString(R.string.unknown_error))
+    }
+
     /**
      * Called when the user changed to the given [chapter] when changing pages from the viewer.
      * It's used only to set this chapter as active.

app/src/main/java/eu/kanade/tachiyomi/util/system/ContextExtensions.kt

@@ -8,12 +8,12 @@ import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.content.pm.PackageManager
+import android.content.pm.ResolveInfo
 import android.content.res.Configuration
 import android.content.res.Resources
 import android.graphics.drawable.Drawable
 import android.net.ConnectivityManager
 import android.net.NetworkCapabilities
-import android.net.Uri
 import android.os.Build
 import android.os.PowerManager
 import android.view.View
@@ -23,6 +23,7 @@ import androidx.annotation.ColorRes
 import androidx.annotation.DrawableRes
 import androidx.annotation.StringRes
 import androidx.browser.customtabs.CustomTabsIntent
+import androidx.browser.customtabs.CustomTabsService.ACTION_CUSTOM_TABS_CONNECTION
 import androidx.core.app.NotificationCompat
 import androidx.core.content.ContextCompat
 import androidx.core.net.toUri
@@ -222,18 +223,47 @@ fun Context.isServiceRunning(serviceClass: Class<*>): Boolean {
 /**
  * Opens a URL in a custom tab.
  */
-fun Context.openInBrowser(url: String) {
+fun Context.openInBrowser(url: String, forceBrowser: Boolean = false): Boolean {
     try {
         val parsedUrl = url.toUri()
         val intent = CustomTabsIntent.Builder()
             .setToolbarColor(getResourceColor(R.attr.colorPrimaryVariant))
             .build()
+        if (forceBrowser) {
+            val packages = getCustomTabsPackages().maxBy { it.preferredOrder }
+            val processName = packages?.activityInfo?.processName ?: return false
+            intent.intent.`package` = processName
+        }
         intent.launchUrl(this, parsedUrl)
+        return true
     } catch (e: Exception) {
         toast(e.message)
+        return false
     }
 }
 
+/**
+ * Returns a list of packages that support Custom Tabs.
+ */
+fun Context.getCustomTabsPackages(): ArrayList<ResolveInfo> {
+    val pm = packageManager
+    // Get default VIEW intent handler.
+    val activityIntent = Intent(Intent.ACTION_VIEW, "http://www.example.com".toUri())
+    // Get all apps that can handle VIEW intents.
+    val resolvedActivityList = pm.queryIntentActivities(activityIntent, 0)
+    val packagesSupportingCustomTabs = ArrayList<ResolveInfo>()
+    for (info in resolvedActivityList) {
+        val serviceIntent = Intent()
+        serviceIntent.action = ACTION_CUSTOM_TABS_CONNECTION
+        serviceIntent.setPackage(info.activityInfo.packageName)
+        // Check if this package also resolves the Custom Tabs service.
+        if (pm.resolveService(serviceIntent, 0) != null) {
+            packagesSupportingCustomTabs.add(info)
+        }
+    }
+    return packagesSupportingCustomTabs
+}
+
 fun Context.isInNightMode(): Boolean {
     val currentNightMode = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
     return currentNightMode == Configuration.UI_MODE_NIGHT_YES

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

@@ -48,6 +48,7 @@
     <string name="marked_as_unread">Marked as unread</string>
     <string name="removed_bookmark">Removed bookmark</string>
     <string name="chapters_removed">Chapters removed.</string>
+    <string name="chapter_not_found">Chapter not found</string>
     <plurals name="remove_n_chapters">
         <item quantity="one">Remove %1$d downloaded chapter?</item>
         <item quantity="other">Remove %1$d downloaded chapters?</item>