Support for manga sources from external APKs

app/src/main/AndroidManifest.xml

@@ -20,6 +20,10 @@
 	<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
 	<uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
 	<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
+	<uses-permission android:name="android.permission.REQUEST_DELETE_PACKAGES"/>
+	<uses-permission
+		android:name="android.permission.QUERY_ALL_PACKAGES"
+		tools:ignore="QueryAllPackagesPermission" />
 	<uses-permission
 		android:name="android.permission.WRITE_EXTERNAL_STORAGE"
 		android:maxSdkVersion="29" />

app/src/main/kotlin/org/koitharu/kotatsu/core/AppModule.kt

@@ -1,6 +1,7 @@
 package org.koitharu.kotatsu.core
 
 import android.app.Application
+import android.content.ContentResolver
 import android.content.Context
 import android.provider.SearchRecentSuggestions
 import android.text.Html

app/src/main/kotlin/org/koitharu/kotatsu/core/model/MangaSource.kt

@@ -9,12 +9,14 @@ import android.text.style.SuperscriptSpan
 import androidx.annotation.StringRes
 import androidx.core.text.inSpans
 import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.parser.external.ExternalMangaSource
 import org.koitharu.kotatsu.core.util.ext.getDisplayName
 import org.koitharu.kotatsu.core.util.ext.getThemeColor
 import org.koitharu.kotatsu.core.util.ext.toLocale
 import org.koitharu.kotatsu.parsers.model.ContentType
 import org.koitharu.kotatsu.parsers.model.MangaParserSource
 import org.koitharu.kotatsu.parsers.model.MangaSource
+import org.koitharu.kotatsu.parsers.util.splitTwoParts
 import com.google.android.material.R as materialR
 
 data object LocalMangaSource : MangaSource {
@@ -26,12 +28,15 @@ data object UnknownMangaSource : MangaSource {
 }
 
 fun MangaSource(name: String?): MangaSource {
-	when (name) {
-		null,
+	when (name ?: return UnknownMangaSource) {
 		UnknownMangaSource.name -> return UnknownMangaSource
 
 		LocalMangaSource.name -> return LocalMangaSource
 	}
+	if (name.startsWith("content:")) {
+		val parts = name.substringAfter(':').splitTwoParts('/') ?: return UnknownMangaSource
+		return ExternalMangaSource(packageName = parts.first, authority = parts.second)
+	}
 	MangaParserSource.entries.forEach {
 		if (it.name == name) return it
 	}
@@ -61,6 +66,8 @@ fun MangaSource.getSummary(context: Context): String? = when (this) {
 		context.getString(R.string.source_summary_pattern, type, locale)
 	}
 
+	is ExternalMangaSource -> context.getString(R.string.external_source)
+
 	else -> null
 }
 
@@ -68,6 +75,7 @@ fun MangaSource.getTitle(context: Context): String = when (this) {
 	is MangaSourceInfo -> mangaSource.getTitle(context)
 	is MangaParserSource -> title
 	LocalMangaSource -> context.getString(R.string.local_storage)
+	is ExternalMangaSource -> resolveName(context)
 	else -> context.getString(R.string.unknown)
 }
 

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/CachingMangaRepository.kt

@@ -0,0 +1,104 @@
+package org.koitharu.kotatsu.core.parser
+
+import android.util.Log
+import androidx.collection.MutableLongSet
+import coil.request.CachePolicy
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.MainCoroutineDispatcher
+import kotlinx.coroutines.async
+import kotlinx.coroutines.currentCoroutineContext
+import org.koitharu.kotatsu.BuildConfig
+import org.koitharu.kotatsu.core.cache.MemoryContentCache
+import org.koitharu.kotatsu.core.cache.SafeDeferred
+import org.koitharu.kotatsu.core.util.MultiMutex
+import org.koitharu.kotatsu.core.util.ext.processLifecycleScope
+import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.parsers.model.MangaChapter
+import org.koitharu.kotatsu.parsers.model.MangaPage
+import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
+
+abstract class CachingMangaRepository(
+	private val cache: MemoryContentCache,
+) : MangaRepository {
+
+	private val detailsMutex = MultiMutex<Long>()
+	private val relatedMangaMutex = MultiMutex<Long>()
+	private val pagesMutex = MultiMutex<Long>()
+
+	final override suspend fun getDetails(manga: Manga): Manga = getDetails(manga, CachePolicy.ENABLED)
+
+	final override suspend fun getPages(chapter: MangaChapter): List<MangaPage> = pagesMutex.withLock(chapter.id) {
+		cache.getPages(source, chapter.url)?.let { return it }
+		val pages = asyncSafe {
+			getPagesImpl(chapter).distinctById()
+		}
+		cache.putPages(source, chapter.url, pages)
+		pages
+	}.await()
+
+	final override suspend fun getRelated(seed: Manga): List<Manga> = relatedMangaMutex.withLock(seed.id) {
+		cache.getRelatedManga(source, seed.url)?.let { return it }
+		val related = asyncSafe {
+			getRelatedMangaImpl(seed).filterNot { it.id == seed.id }
+		}
+		cache.putRelatedManga(source, seed.url, related)
+		related
+	}.await()
+
+	suspend fun getDetails(manga: Manga, cachePolicy: CachePolicy): Manga = detailsMutex.withLock(manga.id) {
+		if (cachePolicy.readEnabled) {
+			cache.getDetails(source, manga.url)?.let { return it }
+		}
+		val details = asyncSafe {
+			getDetailsImpl(manga)
+		}
+		if (cachePolicy.writeEnabled) {
+			cache.putDetails(source, manga.url, details)
+		}
+		details
+	}.await()
+
+	suspend fun peekDetails(manga: Manga): Manga? {
+		return cache.getDetails(source, manga.url)
+	}
+
+	fun invalidateCache() {
+		cache.clear(source)
+	}
+
+	protected abstract suspend fun getDetailsImpl(manga: Manga): Manga
+
+	protected abstract suspend fun getRelatedMangaImpl(seed: Manga): List<Manga>
+
+	protected abstract suspend fun getPagesImpl(chapter: MangaChapter): List<MangaPage>
+
+	private suspend fun <T> asyncSafe(block: suspend CoroutineScope.() -> T): SafeDeferred<T> {
+		var dispatcher = currentCoroutineContext()[CoroutineDispatcher.Key]
+		if (dispatcher == null || dispatcher is MainCoroutineDispatcher) {
+			dispatcher = Dispatchers.Default
+		}
+		return SafeDeferred(
+			processLifecycleScope.async(dispatcher) {
+				runCatchingCancellable { block() }
+			},
+		)
+	}
+
+	private fun List<MangaPage>.distinctById(): List<MangaPage> {
+		if (isEmpty()) {
+			return emptyList()
+		}
+		val result = ArrayList<MangaPage>(size)
+		val set = MutableLongSet(size)
+		for (page in this) {
+			if (set.add(page.id)) {
+				result.add(page)
+			} else if (BuildConfig.DEBUG) {
+				Log.w(null, "Duplicate page: $page")
+			}
+		}
+		return result
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/MangaRepository.kt

@@ -1,12 +1,16 @@
 package org.koitharu.kotatsu.core.parser
 
+import android.content.Context
 import androidx.annotation.AnyThread
 import androidx.collection.ArrayMap
+import dagger.hilt.android.qualifiers.ApplicationContext
 import org.koitharu.kotatsu.core.cache.MemoryContentCache
 import org.koitharu.kotatsu.core.model.LocalMangaSource
 import org.koitharu.kotatsu.core.model.MangaSourceInfo
 import org.koitharu.kotatsu.core.model.UnknownMangaSource
 import org.koitharu.kotatsu.core.network.MirrorSwitchInterceptor
+import org.koitharu.kotatsu.core.parser.external.ExternalMangaRepository
+import org.koitharu.kotatsu.core.parser.external.ExternalMangaSource
 import org.koitharu.kotatsu.local.data.LocalMangaRepository
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.model.ContentRating
@@ -57,8 +61,14 @@ interface MangaRepository {
 
 	suspend fun getRelated(seed: Manga): List<Manga>
 
+	suspend fun find(manga: Manga): Manga? {
+		val list = getList(0, MangaListFilter.Search(manga.title))
+		return list.find { x -> x.id == manga.id }
+	}
+
 	@Singleton
 	class Factory @Inject constructor(
+		@ApplicationContext private val context: Context,
 		private val localMangaRepository: LocalMangaRepository,
 		private val loaderContext: MangaLoaderContext,
 		private val contentCache: MemoryContentCache,
@@ -94,6 +104,16 @@ interface MangaRepository {
 				mirrorSwitchInterceptor = mirrorSwitchInterceptor,
 			)
 
+			is ExternalMangaSource -> if (source.isAvailable(context)) {
+				ExternalMangaRepository(
+					contentResolver = context.contentResolver,
+					source = source,
+					cache = contentCache,
+				)
+			} else {
+				EmptyMangaRepository(source)
+			}
+
 			else -> null
 		}
 	}

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/ParserMangaRepository.kt

@@ -1,24 +1,11 @@
 package org.koitharu.kotatsu.core.parser
 
-import android.util.Log
-import androidx.collection.MutableLongSet
-import coil.request.CachePolicy
-import kotlinx.coroutines.CoroutineDispatcher
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.MainCoroutineDispatcher
-import kotlinx.coroutines.async
-import kotlinx.coroutines.currentCoroutineContext
 import okhttp3.Headers
 import okhttp3.Interceptor
 import okhttp3.Response
-import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.core.cache.MemoryContentCache
-import org.koitharu.kotatsu.core.cache.SafeDeferred
 import org.koitharu.kotatsu.core.network.MirrorSwitchInterceptor
 import org.koitharu.kotatsu.core.prefs.SourceSettings
-import org.koitharu.kotatsu.core.util.MultiMutex
-import org.koitharu.kotatsu.core.util.ext.processLifecycleScope
 import org.koitharu.kotatsu.parsers.MangaParser
 import org.koitharu.kotatsu.parsers.MangaParserAuthProvider
 import org.koitharu.kotatsu.parsers.config.ConfigKey
@@ -38,13 +25,9 @@ import java.util.Locale
 
 class ParserMangaRepository(
 	private val parser: MangaParser,
-	private val cache: MemoryContentCache,
 	private val mirrorSwitchInterceptor: MirrorSwitchInterceptor,
-) : MangaRepository, Interceptor {
-
-	private val detailsMutex = MultiMutex<Long>()
-	private val relatedMangaMutex = MultiMutex<Long>()
-	private val pagesMutex = MultiMutex<Long>()
+	cache: MemoryContentCache,
+) : CachingMangaRepository(cache), Interceptor {
 
 	override val source: MangaParserSource
 		get() = parser.source
@@ -99,18 +82,11 @@ class ParserMangaRepository(
 		}
 	}
 
-	override suspend fun getDetails(manga: Manga): Manga = getDetails(manga, CachePolicy.ENABLED)
-
-	override suspend fun getPages(chapter: MangaChapter): List<MangaPage> = pagesMutex.withLock(chapter.id) {
-		cache.getPages(source, chapter.url)?.let { return it }
-		val pages = asyncSafe {
-			mirrorSwitchInterceptor.withMirrorSwitching {
-				parser.getPages(chapter).distinctById()
-			}
-		}
-		cache.putPages(source, chapter.url, pages)
-		pages
-	}.await()
+	override suspend fun getPagesImpl(
+		chapter: MangaChapter
+	): List<MangaPage> = mirrorSwitchInterceptor.withMirrorSwitching {
+		parser.getPages(chapter)
+	}
 
 	override suspend fun getPageUrl(page: MangaPage): String = mirrorSwitchInterceptor.withMirrorSwitching {
 		parser.getPageUrl(page)
@@ -128,37 +104,10 @@ class ParserMangaRepository(
 		parser.getFavicons()
 	}
 
-	override suspend fun getRelated(seed: Manga): List<Manga> = relatedMangaMutex.withLock(seed.id) {
-		cache.getRelatedManga(source, seed.url)?.let { return it }
-		val related = asyncSafe {
-			parser.getRelatedManga(seed).filterNot { it.id == seed.id }
-		}
-		cache.putRelatedManga(source, seed.url, related)
-		related
-	}.await()
+	override suspend fun getRelatedMangaImpl(seed: Manga): List<Manga> = parser.getRelatedManga(seed)
 
-	suspend fun getDetails(manga: Manga, cachePolicy: CachePolicy): Manga = detailsMutex.withLock(manga.id) {
-		if (cachePolicy.readEnabled) {
-			cache.getDetails(source, manga.url)?.let { return it }
-		}
-		val details = asyncSafe {
-			mirrorSwitchInterceptor.withMirrorSwitching {
-				parser.getDetails(manga)
-			}
-		}
-		if (cachePolicy.writeEnabled) {
-			cache.putDetails(source, manga.url, details)
-		}
-		details
-	}.await()
-
-	suspend fun peekDetails(manga: Manga): Manga? {
-		return cache.getDetails(source, manga.url)
-	}
-
-	suspend fun find(manga: Manga): Manga? {
-		val list = getList(0, MangaListFilter.Search(manga.title))
-		return list.find { x -> x.id == manga.id }
+	override suspend fun getDetailsImpl(manga: Manga): Manga = mirrorSwitchInterceptor.withMirrorSwitching {
+		parser.getDetails(manga)
 	}
 
 	fun getAuthProvider(): MangaParserAuthProvider? = parser as? MangaParserAuthProvider
@@ -175,40 +124,8 @@ class ParserMangaRepository(
 		return getConfig().isSlowdownEnabled
 	}
 
-	fun invalidateCache() {
-		cache.clear(source)
-	}
-
 	fun getConfig() = parser.config as SourceSettings
 
-	private suspend fun <T> asyncSafe(block: suspend CoroutineScope.() -> T): SafeDeferred<T> {
-		var dispatcher = currentCoroutineContext()[CoroutineDispatcher.Key]
-		if (dispatcher == null || dispatcher is MainCoroutineDispatcher) {
-			dispatcher = Dispatchers.Default
-		}
-		return SafeDeferred(
-			processLifecycleScope.async(dispatcher) {
-				runCatchingCancellable { block() }
-			},
-		)
-	}
-
-	private fun List<MangaPage>.distinctById(): List<MangaPage> {
-		if (isEmpty()) {
-			return emptyList()
-		}
-		val result = ArrayList<MangaPage>(size)
-		val set = MutableLongSet(size)
-		for (page in this) {
-			if (set.add(page.id)) {
-				result.add(page)
-			} else if (BuildConfig.DEBUG) {
-				Log.w(null, "Duplicate page: $page")
-			}
-		}
-		return result
-	}
-
 	private suspend fun <R> MirrorSwitchInterceptor.withMirrorSwitching(block: suspend () -> R): R {
 		if (!isEnabled) {
 			return block()

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/external/ExternalMangaRepository.kt

@@ -0,0 +1,264 @@
+package org.koitharu.kotatsu.core.parser.external
+
+import android.content.ContentResolver
+import android.database.Cursor
+import androidx.collection.ArraySet
+import androidx.core.database.getStringOrNull
+import androidx.core.net.toUri
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.runInterruptible
+import org.koitharu.kotatsu.core.cache.MemoryContentCache
+import org.koitharu.kotatsu.core.parser.CachingMangaRepository
+import org.koitharu.kotatsu.core.util.ext.ifNullOrEmpty
+import org.koitharu.kotatsu.parsers.model.ContentRating
+import org.koitharu.kotatsu.parsers.model.ContentType
+import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.parsers.model.MangaChapter
+import org.koitharu.kotatsu.parsers.model.MangaListFilter
+import org.koitharu.kotatsu.parsers.model.MangaPage
+import org.koitharu.kotatsu.parsers.model.MangaState
+import org.koitharu.kotatsu.parsers.model.MangaTag
+import org.koitharu.kotatsu.parsers.model.SortOrder
+import org.koitharu.kotatsu.parsers.util.find
+import org.koitharu.kotatsu.parsers.util.mapNotNullToSet
+import org.koitharu.kotatsu.parsers.util.splitTwoParts
+import java.util.EnumSet
+import java.util.Locale
+
+class ExternalMangaRepository(
+	private val contentResolver: ContentResolver,
+	override val source: ExternalMangaSource,
+	cache: MemoryContentCache,
+) : CachingMangaRepository(cache) {
+
+	private val capabilities by lazy { queryCapabilities() }
+
+	override val sortOrders: Set<SortOrder>
+		get() = capabilities?.availableSortOrders ?: EnumSet.of(SortOrder.ALPHABETICAL)
+	override val states: Set<MangaState>
+		get() = capabilities?.availableStates.orEmpty()
+	override val contentRatings: Set<ContentRating>
+		get() = capabilities?.availableContentRating.orEmpty()
+	override var defaultSortOrder: SortOrder
+		get() = capabilities?.defaultSortOrder ?: SortOrder.ALPHABETICAL
+		set(value) = Unit
+	override val isMultipleTagsSupported: Boolean
+		get() = capabilities?.isMultipleTagsSupported ?: true
+	override val isTagsExclusionSupported: Boolean
+		get() = capabilities?.isTagsExclusionSupported ?: false
+	override val isSearchSupported: Boolean
+		get() = capabilities?.isSearchSupported ?: true
+
+	override suspend fun getList(offset: Int, filter: MangaListFilter?): List<Manga> =
+		runInterruptible(Dispatchers.Default) {
+			val uri = "content://${source.authority}/manga".toUri().buildUpon()
+			uri.appendQueryParameter("offset", offset.toString())
+			when (filter) {
+				is MangaListFilter.Advanced -> {
+					filter.tags.forEach { uri.appendQueryParameter("tag_include", it.key) }
+					filter.tagsExclude.forEach { uri.appendQueryParameter("tag_exclude", it.key) }
+					filter.states.forEach { uri.appendQueryParameter("state", it.name) }
+					filter.locale?.let { uri.appendQueryParameter("locale", it.language) }
+					filter.contentRating.forEach { uri.appendQueryParameter("content_rating", it.name) }
+				}
+
+				is MangaListFilter.Search -> {
+					uri.appendQueryParameter("query", filter.query)
+				}
+
+				null -> Unit
+			}
+			contentResolver.query(uri.build(), null, null, null, filter?.sortOrder?.name)?.use { cursor ->
+				val result = ArrayList<Manga>(cursor.count)
+				if (cursor.moveToFirst()) {
+					do {
+						result += cursor.getManga()
+					} while (cursor.moveToNext())
+				}
+				result
+			}.orEmpty()
+		}
+
+	override suspend fun getDetailsImpl(manga: Manga): Manga = coroutineScope {
+		val chapters = async { queryChapters(manga.url) }
+		val details = queryDetails(manga.url)
+		Manga(
+			id = manga.id,
+			title = details.title.ifBlank { manga.title },
+			altTitle = details.altTitle.ifNullOrEmpty { manga.altTitle },
+			url = details.url.ifEmpty { manga.url },
+			publicUrl = details.publicUrl.ifEmpty { manga.publicUrl },
+			rating = maxOf(details.rating, manga.rating),
+			isNsfw = details.isNsfw,
+			coverUrl = details.coverUrl.ifEmpty { manga.coverUrl },
+			tags = details.tags + manga.tags,
+			state = details.state ?: manga.state,
+			author = details.author.ifNullOrEmpty { manga.author },
+			largeCoverUrl = details.largeCoverUrl.ifNullOrEmpty { manga.largeCoverUrl },
+			description = details.description.ifNullOrEmpty { manga.description },
+			chapters = chapters.await(),
+			source = source,
+		)
+	}
+
+	override suspend fun getPagesImpl(chapter: MangaChapter): List<MangaPage> = runInterruptible(Dispatchers.Default) {
+		val uri = "content://${source.authority}/chapters".toUri()
+			.buildUpon()
+			.appendPath(chapter.url)
+			.build()
+		contentResolver.query(uri, null, null, null, null)?.use { cursor ->
+			val result = ArrayList<MangaPage>(cursor.count)
+			if (cursor.moveToFirst()) {
+				do {
+					result += MangaPage(
+						id = cursor.getLong(0),
+						url = cursor.getString(1),
+						preview = cursor.getStringOrNull(2),
+						source = source,
+					)
+				} while (cursor.moveToNext())
+			}
+			result
+		}.orEmpty()
+	}
+
+	override suspend fun getPageUrl(page: MangaPage): String = page.url
+
+	override suspend fun getTags(): Set<MangaTag> = runInterruptible(Dispatchers.Default) {
+		val uri = "content://${source.authority}/tags".toUri()
+		contentResolver.query(uri, null, null, null, null)?.use { cursor ->
+			val result = ArraySet<MangaTag>(cursor.count)
+			if (cursor.moveToFirst()) {
+				do {
+					result += MangaTag(
+						key = cursor.getString(0),
+						title = cursor.getString(1),
+						source = source,
+					)
+				} while (cursor.moveToNext())
+			}
+			result
+		}.orEmpty()
+	}
+
+	override suspend fun getLocales(): Set<Locale> = emptySet()
+
+	override suspend fun getRelatedMangaImpl(seed: Manga): List<Manga> = emptyList() // TODO
+
+	private suspend fun queryDetails(url: String): Manga = runInterruptible(Dispatchers.Default) {
+		val uri = "content://${source.authority}/manga".toUri()
+			.buildUpon()
+			.appendPath(url)
+			.build()
+		checkNotNull(
+			contentResolver.query(uri, null, null, null, null)?.use { cursor ->
+				cursor.moveToFirst()
+				cursor.getManga()
+			},
+		)
+	}
+
+	private suspend fun queryChapters(url: String): List<MangaChapter>? = runInterruptible(Dispatchers.Default) {
+		val uri = "content://${source.authority}/manga/chapters".toUri()
+			.buildUpon()
+			.appendPath(url)
+			.build()
+		contentResolver.query(uri, null, null, null, null)?.use { cursor ->
+			val result = ArrayList<MangaChapter>(cursor.count)
+			if (cursor.moveToFirst()) {
+				do {
+					result += MangaChapter(
+						id = cursor.getLong(0),
+						name = cursor.getString(1),
+						number = cursor.getFloat(2),
+						volume = cursor.getInt(3),
+						url = cursor.getString(4),
+						scanlator = cursor.getStringOrNull(5),
+						uploadDate = cursor.getLong(6),
+						branch = cursor.getStringOrNull(7),
+						source = source,
+					)
+				} while (cursor.moveToNext())
+			}
+			result
+		}
+	}
+
+	private fun Cursor.getManga() = Manga(
+		id = getLong(0),
+		title = getString(1),
+		altTitle = getStringOrNull(2),
+		url = getString(3),
+		publicUrl = getString(4),
+		rating = getFloat(5),
+		isNsfw = getInt(6) > 1,
+		coverUrl = getString(7),
+		tags = getStringOrNull(8)?.split(':')?.mapNotNullToSet {
+			val parts = it.splitTwoParts('=') ?: return@mapNotNullToSet null
+			MangaTag(key = parts.first, title = parts.second, source = source)
+		}.orEmpty(),
+		state = getStringOrNull(9)?.let { MangaState.entries.find(it) },
+		author = optString(10),
+		largeCoverUrl = optString(11),
+		description = optString(12),
+		chapters = emptyList(),
+		source = source,
+	)
+
+	private fun Cursor.optString(columnIndex: Int): String? {
+		return if (isNull(columnIndex)) {
+			null
+		} else {
+			getString(columnIndex)
+		}
+	}
+
+	private fun queryCapabilities(): MangaSourceCapabilities? {
+		val uri = "content://${source.authority}/capabilities".toUri()
+		return contentResolver.query(uri, null, null, null, null)?.use { cursor ->
+			if (cursor.moveToFirst()) {
+				MangaSourceCapabilities(
+					availableSortOrders = cursor.getStringOrNull(0)
+						?.split(',')
+						?.mapNotNullTo(EnumSet.noneOf(SortOrder::class.java)) {
+							SortOrder.entries.find(it)
+						}.orEmpty(),
+					availableStates = cursor.getStringOrNull(1)
+						?.split(',')
+						?.mapNotNullTo(EnumSet.noneOf(MangaState::class.java)) {
+							MangaState.entries.find(it)
+						}.orEmpty(),
+					availableContentRating = cursor.getStringOrNull(2)
+						?.split(',')
+						?.mapNotNullTo(EnumSet.noneOf(ContentRating::class.java)) {
+							ContentRating.entries.find(it)
+						}.orEmpty(),
+					isMultipleTagsSupported = cursor.getInt(3) > 1,
+					isTagsExclusionSupported = cursor.getInt(4) > 1,
+					isSearchSupported = cursor.getInt(5) > 1,
+					contentType = ContentType.entries.find(cursor.getString(6)) ?: ContentType.OTHER,
+					defaultSortOrder = cursor.getStringOrNull(7)?.let {
+						SortOrder.entries.find(it)
+					} ?: SortOrder.ALPHABETICAL,
+					sourceLocale = cursor.getStringOrNull(8)?.let { Locale(it) } ?: Locale.ROOT,
+				)
+			} else {
+				null
+			}
+		}
+	}
+
+	private class MangaSourceCapabilities(
+		val availableSortOrders: Set<SortOrder>,
+		val availableStates: Set<MangaState>,
+		val availableContentRating: Set<ContentRating>,
+		val isMultipleTagsSupported: Boolean,
+		val isTagsExclusionSupported: Boolean,
+		val isSearchSupported: Boolean,
+		val contentType: ContentType,
+		val defaultSortOrder: SortOrder,
+		val sourceLocale: Locale,
+	)
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/external/ExternalMangaSource.kt

@@ -0,0 +1,30 @@
+package org.koitharu.kotatsu.core.parser.external
+
+import android.content.Context
+import org.koitharu.kotatsu.parsers.model.MangaSource
+
+data class ExternalMangaSource(
+	val packageName: String,
+	val authority: String,
+) : MangaSource {
+
+	override val name: String
+		get() = "content:$packageName/$authority"
+
+	private var cachedName: String? = null
+
+	fun isAvailable(context: Context): Boolean {
+		return context.packageManager.resolveContentProvider(authority, 0)?.isEnabled == true
+	}
+
+	fun resolveName(context: Context): String {
+		cachedName?.let {
+			return it
+		}
+		val pm = context.packageManager
+		val info = pm.resolveContentProvider(authority, 0)
+		return info?.loadLabel(pm)?.toString()?.also {
+			cachedName = it
+		} ?: authority
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/favicon/FaviconFetcher.kt

@@ -1,12 +1,19 @@
 package org.koitharu.kotatsu.core.parser.favicon
 
 import android.content.Context
+import android.graphics.Color
+import android.graphics.drawable.AdaptiveIconDrawable
+import android.graphics.drawable.ColorDrawable
+import android.graphics.drawable.Drawable
+import android.graphics.drawable.LayerDrawable
 import android.net.Uri
+import android.os.Build
 import android.webkit.MimeTypeMap
 import coil.ImageLoader
 import coil.decode.DataSource
 import coil.decode.ImageSource
 import coil.disk.DiskCache
+import coil.fetch.DrawableResult
 import coil.fetch.FetchResult
 import coil.fetch.Fetcher
 import coil.fetch.SourceResult
@@ -14,7 +21,9 @@ import coil.network.HttpException
 import coil.request.Options
 import coil.size.Size
 import coil.size.pxOrElse
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ensureActive
+import kotlinx.coroutines.runInterruptible
 import okhttp3.OkHttpClient
 import okhttp3.Request
 import okhttp3.Response
@@ -24,8 +33,10 @@ import okio.Closeable
 import okio.buffer
 import org.koitharu.kotatsu.core.exceptions.CloudFlareProtectedException
 import org.koitharu.kotatsu.core.model.MangaSource
+import org.koitharu.kotatsu.core.parser.EmptyMangaRepository
 import org.koitharu.kotatsu.core.parser.MangaRepository
 import org.koitharu.kotatsu.core.parser.ParserMangaRepository
+import org.koitharu.kotatsu.core.parser.external.ExternalMangaRepository
 import org.koitharu.kotatsu.core.util.ext.requireBody
 import org.koitharu.kotatsu.core.util.ext.writeAllCancellable
 import org.koitharu.kotatsu.local.data.CacheDir
@@ -53,7 +64,20 @@ class FaviconFetcher(
 
 	override suspend fun fetch(): FetchResult {
 		getCached(options)?.let { return it }
-		val repo = mangaRepositoryFactory.create(mangaSource) as ParserMangaRepository
+		return when (val repo = mangaRepositoryFactory.create(mangaSource)) {
+			is ParserMangaRepository -> fetchParserFavicon(repo)
+			is ExternalMangaRepository -> fetchPluginIcon(repo)
+			is EmptyMangaRepository -> DrawableResult(
+				drawable = ColorDrawable(Color.WHITE),
+				isSampled = false,
+				dataSource = DataSource.MEMORY,
+			)
+
+			else -> throw IllegalArgumentException("")
+		}
+	}
+
+	private suspend fun fetchParserFavicon(repo: ParserMangaRepository): FetchResult {
 		val sizePx = maxOf(
 			options.size.width.pxOrElse { FALLBACK_SIZE },
 			options.size.height.pxOrElse { FALLBACK_SIZE },
@@ -100,6 +124,20 @@ class FaviconFetcher(
 		return response
 	}
 
+	private suspend fun fetchPluginIcon(repository: ExternalMangaRepository): FetchResult {
+		val source = repository.source
+		val pm = options.context.packageManager
+		val icon = runInterruptible(Dispatchers.IO) {
+			val provider = pm.resolveContentProvider(source.authority, 0)
+			provider?.loadIcon(pm) ?: pm.getApplicationIcon(source.packageName)
+		}
+		return DrawableResult(
+			drawable = icon.nonAdaptive(),
+			isSampled = false,
+			dataSource = DataSource.DISK,
+		)
+	}
+
 	private fun getCached(options: Options): SourceResult? {
 		if (!options.diskCachePolicy.readEnabled) {
 			return null
@@ -165,6 +203,13 @@ class FaviconFetcher(
 		}
 	}
 
+	private fun Drawable.nonAdaptive() =
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && this is AdaptiveIconDrawable) {
+			LayerDrawable(arrayOf(background, foreground))
+		} else {
+			this
+		}
+
 	class Factory(
 		context: Context,
 		okHttpClientLazy: Lazy<OkHttpClient>,

app/src/main/kotlin/org/koitharu/kotatsu/explore/data/MangaSourcesRepository.kt

@@ -1,10 +1,16 @@
 package org.koitharu.kotatsu.explore.data
 
+import android.content.BroadcastReceiver
 import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import androidx.core.content.ContextCompat
 import androidx.room.withTransaction
-import dagger.Reusable
 import dagger.hilt.android.qualifiers.ApplicationContext
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.channels.trySendBlocking
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.callbackFlow
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.flatMapLatest
@@ -17,6 +23,7 @@ import org.koitharu.kotatsu.core.db.entity.MangaSourceEntity
 import org.koitharu.kotatsu.core.model.MangaSourceInfo
 import org.koitharu.kotatsu.core.model.getTitle
 import org.koitharu.kotatsu.core.model.isNsfw
+import org.koitharu.kotatsu.core.parser.external.ExternalMangaSource
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.observeAsFlow
 import org.koitharu.kotatsu.core.ui.util.ReversibleHandle
@@ -29,8 +36,9 @@ import java.util.Collections
 import java.util.EnumSet
 import java.util.concurrent.atomic.AtomicBoolean
 import javax.inject.Inject
+import javax.inject.Singleton
 
-@Reusable
+@Singleton
 class MangaSourcesRepository @Inject constructor(
 	@ApplicationContext private val context: Context,
 	private val db: MangaDatabase,
@@ -154,7 +162,14 @@ class MangaSourcesRepository @Inject constructor(
 		dao.observeEnabled(order).map {
 			it.toSources(skipNsfw, order)
 		}
-	}.flatMapLatest { it }.onStart { assimilateNewSources() }
+	}.flatMapLatest { it }
+		.onStart { assimilateNewSources() }
+		.combine(observeExternalSources()) { enabled, external ->
+			val list = ArrayList<MangaSourceInfo>(enabled.size + external.size)
+			external.mapTo(list) { MangaSourceInfo(it, isEnabled = true, isPinned = true) }
+			list.addAll(enabled)
+			list
+		}
 
 	fun observeAll(): Flow<List<Pair<MangaSource, Boolean>>> = dao.observeAll().map { entities ->
 		val result = ArrayList<Pair<MangaSource, Boolean>>(entities.size)
@@ -292,6 +307,40 @@ class MangaSourcesRepository @Inject constructor(
 		}
 	}
 
+	private fun observeExternalSources(): Flow<List<ExternalMangaSource>> {
+		val intent = Intent("app.kotatsu.parser.PROVIDE_MANGA")
+		val pm = context.packageManager
+		return callbackFlow {
+			val receiver = object : BroadcastReceiver() {
+				override fun onReceive(context: Context?, intent: Intent?) {
+					trySendBlocking(intent)
+				}
+			}
+			ContextCompat.registerReceiver(
+				context,
+				receiver,
+				IntentFilter().apply {
+					addAction(Intent.ACTION_PACKAGE_ADDED)
+					addAction(Intent.ACTION_PACKAGE_VERIFIED)
+					addAction(Intent.ACTION_PACKAGE_REPLACED)
+					addAction(Intent.ACTION_PACKAGE_REMOVED)
+					addAction(Intent.ACTION_PACKAGE_FULLY_REMOVED)
+					addDataScheme("package")
+				},
+				ContextCompat.RECEIVER_EXPORTED,
+			)
+			awaitClose { context.unregisterReceiver(receiver) }
+		}.onStart {
+			emit(null)
+		}.map {
+			pm.queryIntentContentProviders(intent, 0).map { resolveInfo ->
+				ExternalMangaSource(
+					packageName = resolveInfo.providerInfo.packageName,
+					authority = resolveInfo.providerInfo.authority,
+				)
+			}
+		}.distinctUntilChanged()
+	}
 
 	private fun List<MangaSourceEntity>.toSources(
 		skipNsfwSources: Boolean,

app/src/main/kotlin/org/koitharu/kotatsu/explore/ui/ExploreFragment.kt

@@ -2,6 +2,8 @@ package org.koitharu.kotatsu.explore.ui
 
 import android.content.DialogInterface
 import android.content.Intent
+import android.net.Uri
+import android.os.Build
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.Menu
@@ -21,6 +23,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.bookmarks.ui.AllBookmarksActivity
 import org.koitharu.kotatsu.core.exceptions.resolve.SnackbarErrorObserver
 import org.koitharu.kotatsu.core.model.LocalMangaSource
+import org.koitharu.kotatsu.core.parser.external.ExternalMangaSource
 import org.koitharu.kotatsu.core.ui.BaseFragment
 import org.koitharu.kotatsu.core.ui.dialog.TwoButtonsAlertDialog
 import org.koitharu.kotatsu.core.ui.list.ListSelectionController
@@ -41,6 +44,7 @@ import org.koitharu.kotatsu.explore.ui.model.MangaSourceItem
 import org.koitharu.kotatsu.list.ui.adapter.TypedListSpacingDecoration
 import org.koitharu.kotatsu.list.ui.model.ListHeader
 import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.parsers.model.MangaParserSource
 import org.koitharu.kotatsu.search.ui.MangaListActivity
 import org.koitharu.kotatsu.settings.SettingsActivity
 import org.koitharu.kotatsu.settings.sources.catalog.SourcesCatalogActivity
@@ -170,6 +174,8 @@ class ExploreFragment :
 		menu.findItem(R.id.action_shortcut).isVisible = isSingleSelection
 		menu.findItem(R.id.action_pin).isVisible = selectedSources.all { !it.isPinned }
 		menu.findItem(R.id.action_unpin).isVisible = selectedSources.all { it.isPinned }
+		menu.findItem(R.id.action_disable)?.isVisible = selectedSources.all { it.mangaSource is MangaParserSource }
+		menu.findItem(R.id.action_delete)?.isVisible = selectedSources.all { it.mangaSource is ExternalMangaSource }
 		return super.onPrepareActionMode(controller, mode, menu)
 	}
 
@@ -190,6 +196,13 @@ class ExploreFragment :
 				mode.finish()
 			}
 
+			R.id.action_delete -> {
+				selectedSources.forEach {
+					(it.mangaSource as? ExternalMangaSource)?.let { uninstallExternalSource(it) }
+				}
+				mode.finish()
+			}
+
 			R.id.action_shortcut -> {
 				val source = selectedSources.singleOrNull() ?: return false
 				viewModel.requestPinShortcut(source)
@@ -238,4 +251,14 @@ class ExploreFragment :
 			.create()
 			.show()
 	}
+
+	private fun uninstallExternalSource(source: ExternalMangaSource) {
+		val uri = Uri.fromParts("package", source.packageName, null)
+		val action = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+			Intent.ACTION_DELETE
+		} else {
+			Intent.ACTION_UNINSTALL_PACKAGE
+		}
+		context?.startActivity(Intent(action, uri))
+	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/settings/SettingsActivity.kt

@@ -2,7 +2,9 @@ package org.koitharu.kotatsu.settings
 
 import android.content.Context
 import android.content.Intent
+import android.net.Uri
 import android.os.Bundle
+import android.provider.Settings
 import android.view.ViewGroup.MarginLayoutParams
 import androidx.core.graphics.Insets
 import androidx.core.view.updateLayoutParams
@@ -17,6 +19,8 @@ import dagger.hilt.android.AndroidEntryPoint
 import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.model.MangaSource
+import org.koitharu.kotatsu.core.model.MangaSourceInfo
+import org.koitharu.kotatsu.core.parser.external.ExternalMangaSource
 import org.koitharu.kotatsu.core.ui.BaseActivity
 import org.koitharu.kotatsu.core.util.ext.textAndVisible
 import org.koitharu.kotatsu.databinding.ActivitySettingsBinding
@@ -174,9 +178,14 @@ class SettingsActivity :
 			Intent(context, SettingsActivity::class.java)
 				.setAction(ACTION_MANAGE_DOWNLOADS)
 
-		fun newSourceSettingsIntent(context: Context, source: MangaSource) =
-			Intent(context, SettingsActivity::class.java)
+		fun newSourceSettingsIntent(context: Context, source: MangaSource): Intent = when (source) {
+			is MangaSourceInfo -> newSourceSettingsIntent(context, source.mangaSource)
+			is ExternalMangaSource -> Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
+				.setData(Uri.fromParts("package", source.packageName, null))
+
+			else -> Intent(context, SettingsActivity::class.java)
 				.setAction(ACTION_SOURCE)
 				.putExtra(EXTRA_SOURCE, source.name)
+		}
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/settings/sources/SourceSettingsFragment.kt

@@ -21,6 +21,7 @@ import org.koitharu.kotatsu.core.util.ext.observeEvent
 import org.koitharu.kotatsu.core.util.ext.withArgs
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.settings.sources.auth.SourceAuthActivity
+import java.io.File
 
 @AndroidEntryPoint
 class SourceSettingsFragment : BasePreferenceFragment(0), Preference.OnPreferenceChangeListener {
@@ -37,7 +38,7 @@ class SourceSettingsFragment : BasePreferenceFragment(0), Preference.OnPreferenc
 	}
 
 	override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
-		preferenceManager.sharedPreferencesName = viewModel.source.name
+		preferenceManager.sharedPreferencesName = viewModel.source.name.replace(File.separatorChar, '$')
 		addPreferencesFromResource(R.xml.pref_source)
 		addPreferencesFromRepository(viewModel.repository)
 		val isValidSource = viewModel.repository !is EmptyMangaRepository

app/src/main/kotlin/org/koitharu/kotatsu/settings/sources/SourceSettingsViewModel.kt

@@ -10,6 +10,7 @@ import okhttp3.HttpUrl
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.model.MangaSource
 import org.koitharu.kotatsu.core.network.cookies.MutableCookieJar
+import org.koitharu.kotatsu.core.parser.CachingMangaRepository
 import org.koitharu.kotatsu.core.parser.MangaRepository
 import org.koitharu.kotatsu.core.parser.ParserMangaRepository
 import org.koitharu.kotatsu.core.prefs.SourceSettings
@@ -58,7 +59,7 @@ class SourceSettingsViewModel @Inject constructor(
 
 	override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {
 		when (repository) {
-			is ParserMangaRepository -> {
+			is CachingMangaRepository -> {
 				if (key != SourceSettings.KEY_SLOWDOWN && key != SourceSettings.KEY_SORT_ORDER) {
 					repository.invalidateCache()
 				}

app/src/main/res/menu/mode_source.xml

@@ -9,6 +9,13 @@
 		android:title="@string/disable"
 		app:showAsAction="ifRoom|withText" />
 
+	<item
+		android:id="@+id/action_delete"
+		android:icon="@drawable/ic_delete"
+		android:title="@string/delete"
+		android:visible="false"
+		app:showAsAction="ifRoom|withText" />
+
 	<item
 		android:id="@+id/action_pin"
 		android:icon="@drawable/ic_pin"

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

@@ -668,4 +668,5 @@
 	<string name="percent_left">Percent left</string>
 	<string name="chapters_read">Chapters read</string>
 	<string name="chapters_left">Chapters left</string>
+	<string name="external_source">External/plugin</string>
 </resources>