Fix grouple pages parsing #156

src/main/kotlin/org/koitharu/kotatsu/parsers/config/ConfigKey.kt

@@ -14,4 +14,8 @@ sealed class ConfigKey<T>(
 	class ShowSuspiciousContent(
 		override val defaultValue: Boolean,
 	) : ConfigKey<Boolean>("show_suspicious")
+
+	class UserAgent(
+		override val defaultValue: String,
+	) : ConfigKey<String>("user_agent")
 }

src/main/kotlin/org/koitharu/kotatsu/parsers/site/grouple/GroupleParser.kt

@@ -5,10 +5,12 @@ import kotlinx.coroutines.coroutineScope
 import okhttp3.Headers
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import okhttp3.Response
+import okhttp3.internal.headersContentLength
 import org.json.JSONArray
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaParser
 import org.koitharu.kotatsu.parsers.MangaParserAuthProvider
+import org.koitharu.kotatsu.parsers.config.ConfigKey
 import org.koitharu.kotatsu.parsers.exception.AuthRequiredException
 import org.koitharu.kotatsu.parsers.exception.ParseException
 import org.koitharu.kotatsu.parsers.model.*
@@ -21,6 +23,7 @@ private const val PAGE_SIZE = 70
 private const val PAGE_SIZE_SEARCH = 50
 private const val NSFW_ALERT = "сексуальные сцены"
 private const val NOTHING_FOUND = "Ничего не найдено"
+private const val MIN_IMAGE_SIZE = 1024L
 
 internal abstract class GroupleParser(
 	context: MangaLoaderContext,
@@ -31,11 +34,13 @@ internal abstract class GroupleParser(
 	@Volatile
 	private var cachedPagesServer: String? = null
 
-	override val headers = Headers.Builder()
-		.add(
-			"User-Agent",
+	private val userAgentKey = ConfigKey.UserAgent(
 		"Mozilla/5.0 (X11; U; UNICOS lcLinux; en-US) Gecko/20140730 (KHTML, like Gecko, Safari/419.3) Arora/0.8.0",
 	)
+
+	override val headers: Headers
+		get() = Headers.Builder()
+			.add("User-Agent", config[userAgentKey])
 			.build()
 
 	override val sortOrders: Set<SortOrder> = EnumSet.of(
@@ -237,15 +242,23 @@ internal abstract class GroupleParser(
 		if (cachedServer != null && cachedServer in servers && tryHead(cachedServer + path)) {
 			return cachedServer + path
 		}
-		val server = coroutineScope {
+		if (servers.isEmpty()) {
+			throw ParseException("No servers found for page", page.url)
+		}
+		val server = try {
+			coroutineScope {
 				servers.map { server ->
 					async {
 						if (tryHead(server + path)) server else null
 					}
 				}.awaitFirst { it != null }
+			}.also {
+				cachedPagesServer = it
+			}
+		} catch (e: NoSuchElementException) {
+			servers.random()
 		}
-		cachedPagesServer = server
-		return checkNotNull(server + path)
+		return checkNotNull(server) + path
 	}
 
 	override suspend fun getTags(): Set<MangaTag> {
@@ -316,8 +329,9 @@ internal abstract class GroupleParser(
 		return webClient.httpPost(url, payload)
 	}
 
-	private suspend fun tryHead(url: String): Boolean = runCatchingCancellable {
-		webClient.httpHead(url).isSuccessful
+	suspend fun tryHead(url: String): Boolean = runCatchingCancellable {
+		val response = webClient.httpHead(url)
+		response.isSuccessful && response.headersContentLength() >= MIN_IMAGE_SIZE
 	}.getOrDefault(false)
 
 	private fun Response.checkAuthRequired(): Response {

src/test/kotlin/org/koitharu/kotatsu/parsers/MangaLoaderContextMock.kt

@@ -1,7 +1,6 @@
 package org.koitharu.kotatsu.parsers
 
 import com.koushikdutta.quack.QuackContext
-import okhttp3.Headers
 import okhttp3.OkHttpClient
 import okhttp3.Request
 import okhttp3.Response
@@ -13,7 +12,7 @@ import java.util.concurrent.TimeUnit
 internal object MangaLoaderContextMock : MangaLoaderContext() {
 
 	private val userAgent = "Kotatsu/%s (Android %s; %s; %s %s; %s)".format(
-        /*BuildConfig.VERSION_NAME*/ "4.3",
+		/*BuildConfig.VERSION_NAME*/ "4.4",
 		/*Build.VERSION.RELEASE*/ "r",
 		/*Build.MODEL*/ "",
 		/*Build.BRAND*/ "",
@@ -46,15 +45,12 @@ internal object MangaLoaderContextMock : MangaLoaderContext() {
 		return SourceConfigMock()
 	}
 
-    suspend fun doRequest(url: String, referer: String? = null, extraHeaders: Headers? = null): Response {
+	suspend fun doRequest(url: String, source: MangaSource?): Response {
 		val request = Request.Builder()
 			.get()
 			.url(url)
-        if (extraHeaders != null) {
-            request.headers(extraHeaders)
-        }
-        if (referer != null) {
-            request.header("Referer", referer)
+		if (source != null) {
+			request.tag(MangaSource::class.java, source)
 		}
 		return httpClient.newCall(request.build()).await()
 	}

src/test/kotlin/org/koitharu/kotatsu/parsers/MangaParserTest.kt

@@ -11,10 +11,7 @@ import org.koitharu.kotatsu.parsers.model.SortOrder
 import org.koitharu.kotatsu.parsers.util.domain
 import org.koitharu.kotatsu.parsers.util.medianOrNull
 import org.koitharu.kotatsu.parsers.util.mimeType
-import org.koitharu.kotatsu.test_util.isDistinct
-import org.koitharu.kotatsu.test_util.isDistinctBy
-import org.koitharu.kotatsu.test_util.isUrlAbsolute
-import org.koitharu.kotatsu.test_util.maxDuplicates
+import org.koitharu.kotatsu.test_util.*
 
 
 @ExtendWith(AuthCheckExtension::class)
@@ -105,9 +102,9 @@ internal class MangaParserTest {
 				"Chapters are not distinct by number: ${c.maxDuplicates { it.number to it.branch }} for $publicUrl"
 			}
 			assert(c.all { it.source == source })
-            checkImageRequest(coverUrl, publicUrl)
+			checkImageRequest(coverUrl, source)
 			largeCoverUrl?.let {
-                checkImageRequest(it, publicUrl)
+				checkImageRequest(it, source)
 			}
 		}
 	}
@@ -129,7 +126,7 @@ internal class MangaParserTest {
 		val pageUrl = parser.getPageUrl(page)
 		assert(pageUrl.isNotEmpty())
 		assert(pageUrl.isUrlAbsolute())
-        checkImageRequest(pageUrl, page.referer)
+		checkImageRequest(pageUrl, page.source)
 	}
 
 	@ParameterizedTest(name = "{index}|favicon|{0}")
@@ -145,7 +142,7 @@ internal class MangaParserTest {
 		}
 		val favicon = favicons.find(24)
 		checkNotNull(favicon)
-        checkImageRequest(favicon.url, favicons.referer)
+		checkImageRequest(favicon.url, source)
 	}
 
 	@ParameterizedTest(name = "{index}|domain|{0}")
@@ -157,7 +154,7 @@ internal class MangaParserTest {
 			.host(defaultDomain)
 			.scheme("https")
 			.toString()
-        val response = context.doRequest(url, extraHeaders = parser.headers)
+		val response = context.doRequest(url, source)
 		val realUrl = response.request.url
 		val realDomain = realUrl.topPrivateDomain()
 		val realHost = realUrl.host
@@ -189,11 +186,11 @@ internal class MangaParserTest {
 			assert(item.publicUrl.isUrlAbsolute())
 		}
 		val testItem = list.random()
-        checkImageRequest(testItem.coverUrl, testItem.publicUrl)
+		checkImageRequest(testItem.coverUrl, testItem.source)
 	}
 
-    private suspend fun checkImageRequest(url: String, referer: String?) {
-        context.doRequest(url, referer).use {
+	private suspend fun checkImageRequest(url: String, source: MangaSource) {
+		context.doRequest(url, source).use {
 			assert(it.isSuccessful) { "Request failed: ${it.code}(${it.message}): $url" }
 			assert(it.mimeType?.startsWith("image/") == true) {
 				"Wrong response mime type: ${it.mimeType}"