Detect CloudFlare blocks

app/src/main/kotlin/org/koitharu/kotatsu/core/exceptions/CloudFlareBlockedException.kt

@@ -0,0 +1,10 @@
+package org.koitharu.kotatsu.core.exceptions
+
+import okhttp3.Headers
+import okio.IOException
+import org.koitharu.kotatsu.parsers.model.MangaSource
+
+class CloudFlareBlockedException(
+	val url: String,
+	val source: MangaSource?,
+) : IOException("Blocked by CloudFlare")

app/src/main/kotlin/org/koitharu/kotatsu/core/network/CloudFlareInterceptor.kt

@@ -4,6 +4,7 @@ import okhttp3.Interceptor
 import okhttp3.Response
 import okhttp3.internal.closeQuietly
 import org.jsoup.Jsoup
+import org.koitharu.kotatsu.core.exceptions.CloudFlareBlockedException
 import org.koitharu.kotatsu.core.exceptions.CloudFlareProtectedException
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import java.net.HttpURLConnection.HTTP_FORBIDDEN
@@ -17,9 +18,17 @@ class CloudFlareInterceptor : Interceptor {
 			val content = response.body?.let { response.peekBody(Long.MAX_VALUE) }?.byteStream()?.use {
 				Jsoup.parse(it, Charsets.UTF_8.name(), response.request.url.toString())
 			} ?: return response
-			if (content.getElementById("challenge-error-title") != null) {
+			val hasCaptcha = content.getElementById("challenge-error-title") != null
+			val isBlocked = content.selectFirst("h2[data-translate=\"blocked_why_headline\"]") != null
+			if (hasCaptcha || isBlocked) {
 				val request = response.request
 				response.closeQuietly()
+				if (isBlocked) {
+					throw CloudFlareBlockedException(
+						url = request.url.toString(),
+						source = request.tag(MangaSource::class.java),
+					)
+				} else {
 					throw CloudFlareProtectedException(
 						url = request.url.toString(),
 						source = request.tag(MangaSource::class.java),
@@ -27,6 +36,7 @@ class CloudFlareInterceptor : Interceptor {
 					)
 				}
 			}
+		}
 		return response
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Throwable.kt

@@ -12,6 +12,7 @@ import org.jsoup.HttpStatusException
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.exceptions.BadBackupFormatException
 import org.koitharu.kotatsu.core.exceptions.CaughtException
+import org.koitharu.kotatsu.core.exceptions.CloudFlareBlockedException
 import org.koitharu.kotatsu.core.exceptions.CloudFlareProtectedException
 import org.koitharu.kotatsu.core.exceptions.EmptyHistoryException
 import org.koitharu.kotatsu.core.exceptions.NoDataReceivedException
@@ -38,6 +39,7 @@ private const val IMAGE_FORMAT_NOT_SUPPORTED = "Image format not supported"
 fun Throwable.getDisplayMessage(resources: Resources): String = when (this) {
 	is AuthRequiredException -> resources.getString(R.string.auth_required)
 	is CloudFlareProtectedException -> resources.getString(R.string.captcha_required)
+	is CloudFlareBlockedException -> resources.getString(R.string.blocked_by_server_message)
 	is ActivityNotFoundException,
 	is UnsupportedOperationException,
 	-> resources.getString(R.string.operation_not_supported)
@@ -79,6 +81,8 @@ fun Throwable.getDisplayIcon() = when (this) {
 	is SocketTimeoutException,
 	-> R.drawable.ic_plug_large
 
+	is CloudFlareBlockedException -> R.drawable.ic_denied_large
+
 	else -> R.drawable.ic_error_large
 }
 

app/src/main/kotlin/org/koitharu/kotatsu/remotelist/ui/RemoteListViewModel.kt

@@ -40,6 +40,7 @@ import org.koitharu.kotatsu.list.ui.model.LoadingState
 import org.koitharu.kotatsu.list.ui.model.toErrorFooter
 import org.koitharu.kotatsu.list.ui.model.toErrorState
 import org.koitharu.kotatsu.list.ui.model.toUi
+import org.koitharu.kotatsu.parsers.exception.NotFoundException
 import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.parsers.model.MangaListFilter
 import org.koitharu.kotatsu.parsers.model.MangaSource
@@ -88,7 +89,7 @@ open class RemoteListViewModel @Inject constructor(
 				list.isNullOrEmpty() && error != null -> add(
 					error.toErrorState(
 						canRetry = true,
-						secondaryAction = if (browserUrl != null) R.string.open_in_browser else 0,
+						secondaryAction = if (error !is NotFoundException && browserUrl != null) R.string.open_in_browser else 0,
 					),
 				)
 

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

@@ -640,4 +640,5 @@
 	<string name="recent_queries">Recent queries</string>
 	<string name="suggested_queries">Suggested queries</string>
 	<string name="authors">Authors</string>
+	<string name="blocked_by_server_message">You are blocked by the server. Try to use a different network connection (VPN, Proxy, etc.)</string>
 </resources>