Limit cache max-age and action to clear cache manually

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

@@ -23,6 +23,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.coroutines.flow.asSharedFlow
+import okhttp3.Cache
 import okhttp3.CookieJar
 import okhttp3.OkHttpClient
 import org.koitharu.kotatsu.BuildConfig
@@ -90,14 +91,19 @@ interface AppModule {
 
 		@Provides
 		@Singleton
-		fun provideOkHttpClient(
+		fun provideHttpCache(
 			localStorageManager: LocalStorageManager,
+		): Cache = localStorageManager.createHttpCache()
+
+		@Provides
+		@Singleton
+		fun provideOkHttpClient(
+			cache: Cache,
 			commonHeadersInterceptor: CommonHeadersInterceptor,
 			mirrorSwitchInterceptor: MirrorSwitchInterceptor,
 			cookieJar: CookieJar,
 			settings: AppSettings,
 		): OkHttpClient {
-			val cache = localStorageManager.createHttpCache()
 			return OkHttpClient.Builder().apply {
 				connectTimeout(20, TimeUnit.SECONDS)
 				readTimeout(60, TimeUnit.SECONDS)
@@ -108,6 +114,7 @@ interface AppModule {
 					bypassSSLErrors()
 				}
 				cache(cache)
+				addNetworkInterceptor(CacheLimitInterceptor())
 				addInterceptor(GZipInterceptor())
 				addInterceptor(commonHeadersInterceptor)
 				addInterceptor(CloudFlareInterceptor())

app/src/main/java/org/koitharu/kotatsu/core/network/CacheLimitInterceptor.kt

@@ -0,0 +1,26 @@
+package org.koitharu.kotatsu.core.network
+
+import okhttp3.CacheControl
+import okhttp3.Interceptor
+import okhttp3.Response
+import java.util.concurrent.TimeUnit
+
+class CacheLimitInterceptor : Interceptor {
+
+	private val defaultMaxAge = TimeUnit.HOURS.toSeconds(1)
+	private val defaultCacheControl = CacheControl.Builder()
+		.maxAge(defaultMaxAge.toInt(), TimeUnit.SECONDS)
+		.build()
+		.toString()
+
+	override fun intercept(chain: Interceptor.Chain): Response {
+		val response = chain.proceed(chain.request())
+		val responseCacheControl = CacheControl.parse(response.headers)
+		if (responseCacheControl.noStore || responseCacheControl.maxAgeSeconds <= defaultMaxAge) {
+			return response
+		}
+		return response.newBuilder()
+			.header(CommonHeaders.CACHE_CONTROL, defaultCacheControl)
+			.build()
+	}
+}

app/src/main/java/org/koitharu/kotatsu/core/network/CommonHeaders.kt

@@ -13,6 +13,7 @@ object CommonHeaders {
 	const val CONTENT_ENCODING = "Content-Encoding"
 	const val ACCEPT_ENCODING = "Accept-Encoding"
 	const val AUTHORIZATION = "Authorization"
+	const val CACHE_CONTROL = "Cache-Control"
 
 	val CACHE_CONTROL_NO_STORE: CacheControl
 		get() = CacheControl.Builder().noStore().build()

app/src/main/java/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -345,6 +345,7 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_SOURCES_HIDDEN = "sources_hidden"
 		const val KEY_TRAFFIC_WARNING = "traffic_warning"
 		const val KEY_PAGES_CACHE_CLEAR = "pages_cache_clear"
+		const val KEY_HTTP_CACHE_CLEAR = "http_cache_clear"
 		const val KEY_COOKIES_CLEAR = "cookies_clear"
 		const val KEY_THUMBS_CACHE_CLEAR = "thumbs_cache_clear"
 		const val KEY_SEARCH_HISTORY_CLEAR = "search_history_clear"

app/src/main/java/org/koitharu/kotatsu/settings/HistorySettingsFragment.kt

@@ -8,7 +8,10 @@ import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.google.android.material.snackbar.Snackbar
 import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.runInterruptible
+import okhttp3.Cache
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.network.cookies.MutableCookieJar
 import org.koitharu.kotatsu.core.os.ShortcutsUpdater
@@ -39,6 +42,9 @@ class HistorySettingsFragment : BasePreferenceFragment(R.string.history_and_cach
 	@Inject
 	lateinit var cookieJar: MutableCookieJar
 
+	@Inject
+	lateinit var cache: Cache
+
 	@Inject
 	lateinit var shortcutsUpdater: ShortcutsUpdater
 
@@ -52,6 +58,7 @@ class HistorySettingsFragment : BasePreferenceFragment(R.string.history_and_cach
 		super.onViewCreated(view, savedInstanceState)
 		findPreference<Preference>(AppSettings.KEY_PAGES_CACHE_CLEAR)?.bindSummaryToCacheSize(CacheDir.PAGES)
 		findPreference<Preference>(AppSettings.KEY_THUMBS_CACHE_CLEAR)?.bindSummaryToCacheSize(CacheDir.THUMBS)
+		findPreference<Preference>(AppSettings.KEY_HTTP_CACHE_CLEAR)?.bindSummaryToHttpCacheSize()
 		findPreference<Preference>(AppSettings.KEY_SEARCH_HISTORY_CLEAR)?.let { pref ->
 			viewLifecycleScope.launch {
 				lifecycle.awaitStateAtLeast(Lifecycle.State.RESUMED)
@@ -90,6 +97,11 @@ class HistorySettingsFragment : BasePreferenceFragment(R.string.history_and_cach
 				true
 			}
 
+			AppSettings.KEY_HTTP_CACHE_CLEAR -> {
+				clearHttpCache()
+				true
+			}
+
 			AppSettings.KEY_UPDATES_FEED_CLEAR -> {
 				viewLifecycleScope.launch {
 					trackerRepo.clearLogs()
@@ -131,6 +143,32 @@ class HistorySettingsFragment : BasePreferenceFragment(R.string.history_and_cach
 		summary = FileSize.BYTES.format(context, size)
 	}
 
+	private fun Preference.bindSummaryToHttpCacheSize() = viewLifecycleScope.launch {
+		val size = runInterruptible(Dispatchers.IO) { cache.size() }
+		summary = FileSize.BYTES.format(context, size)
+	}
+
+	private fun clearHttpCache() {
+		val preference = findPreference<Preference>(AppSettings.KEY_HTTP_CACHE_CLEAR) ?: return
+		val ctx = preference.context.applicationContext
+		viewLifecycleScope.launch {
+			try {
+				preference.isEnabled = false
+				val size = runInterruptible(Dispatchers.IO) {
+					cache.evictAll()
+					cache.size()
+				}
+				preference.summary = FileSize.BYTES.format(ctx, size)
+			} catch (e: CancellationException) {
+				throw e
+			} catch (e: Exception) {
+				preference.summary = e.getDisplayMessage(ctx.resources)
+			} finally {
+				preference.isEnabled = true
+			}
+		}
+	}
+
 	private fun clearSearchHistory(preference: Preference) {
 		MaterialAlertDialogBuilder(context ?: return)
 			.setTitle(R.string.clear_search_history)

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

@@ -416,4 +416,5 @@
 	<string name="suggestions_enable_prompt">Do you want to receive personalized manga suggestions?</string>
 	<string name="translations">Translations</string>
 	<string name="web_view_unavailable">WebView not available: check if WebView provider is installed</string>
+	<string name="clear_network_cache">Clear network cache</string>
 </resources>

app/src/main/res/xml/pref_history.xml

@@ -39,6 +39,12 @@
 			android:summary="@string/computing_"
 			android:title="@string/clear_pages_cache" />
 
+		<Preference
+			android:key="http_cache_clear"
+			android:persistent="false"
+			android:summary="@string/loading_"
+			android:title="@string/clear_network_cache" />
+
 		<Preference
 			android:key="cookies_clear"
 			android:persistent="false"