fix(delegate): migrate NH to the v2 api (#1581)

* fix(delegate): migrate NH to the v2 api

* remove extra comment

* remove redundant data

* linting

* Code cleanup

---------

Co-authored-by: Jobobby04 <jobobby04@users.noreply.github.com>

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

@@ -29,6 +29,7 @@ import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
 import okhttp3.CacheControl
 import okhttp3.Response
+import tachiyomi.core.common.util.lang.withIOContext
 
 class NHentai(delegate: HttpSource, val context: Context) :
     DelegatedHttpSource(delegate),
@@ -70,12 +71,8 @@ class NHentai(delegate: HttpSource, val context: Context) :
     }
 
     override suspend fun parseIntoMetadata(metadata: NHentaiSearchMetadata, input: Response) {
-        val body = input.body.string()
-        val server = MEDIA_SERVER_REGEX.find(body)?.groupValues?.get(1)?.toInt() ?: 1
-        val json = GALLERY_JSON_REGEX.find(body)!!.groupValues[1].replace(
-            UNICODE_ESCAPE_REGEX,
-        ) { it.groupValues[1].toInt(radix = 16).toChar().toString() }
-        val jsonResponse = jsonParser.decodeFromString<JsonResponse>(json)
+        if (nhConfig == null) getNhConfig()
+        val jsonResponse = jsonParser.decodeFromString<JsonResponse>(input.body.string())
 
         with(metadata) {
             nhId = jsonResponse.id
@@ -86,8 +83,6 @@ class NHentai(delegate: HttpSource, val context: Context) :
 
             mediaId = jsonResponse.mediaId
 
-            mediaServer = server
-
             jsonResponse.title?.let { title ->
                 japaneseTitle = title.japanese
                 shortTitle = title.pretty
@@ -96,15 +91,11 @@ class NHentai(delegate: HttpSource, val context: Context) :
 
             preferredTitle = this@NHentai.preferredTitle
 
-            jsonResponse.images?.let { images ->
-                coverImageType = images.cover?.type
-                images.pages.mapNotNull {
-                    it.type
-                }.let {
-                    pageImageTypes = it
-                }
-                thumbnailImageType = images.thumbnail?.type
-            }
+            coverImageUrl =
+                jsonResponse.cover?.path?.let { "$thumbServer/$it" }
+                    ?: jsonResponse.thumbnail?.path?.let { "$thumbServer/$it" }
+
+            pageImagePreviewUrls = jsonResponse.pages.mapNotNull { it.thumbnail }
 
             scanlator = jsonResponse.scanlator?.trimOrNull()
 
@@ -125,13 +116,22 @@ class NHentai(delegate: HttpSource, val context: Context) :
         }
     }
 
+    @Serializable
+    data class JsonConfig(
+        @SerialName("image_servers")
+        val imageServers: List<String> = emptyList(),
+        @SerialName("thumb_servers")
+        val thumbServers: List<String> = emptyList(),
+    )
+
     @Serializable
     data class JsonResponse(
         val id: Long,
         @SerialName("media_id")
         val mediaId: String? = null,
         val title: JsonTitle? = null,
-        val images: JsonImages? = null,
+        val cover: JsonPage? = null,
+        val thumbnail: JsonPage? = null,
         val scanlator: String? = null,
         @SerialName("upload_date")
         val uploadDate: Long? = null,
@@ -140,6 +140,7 @@ class NHentai(delegate: HttpSource, val context: Context) :
         val numPages: Int? = null,
         @SerialName("num_favorites")
         val numFavorites: Long? = null,
+        val pages: List<JsonPage> = emptyList(),
     )
 
     @Serializable
@@ -149,21 +150,12 @@ class NHentai(delegate: HttpSource, val context: Context) :
         val pretty: String? = null,
     )
 
-    @Serializable
-    data class JsonImages(
-        val pages: List<JsonPage> = emptyList(),
-        val cover: JsonPage? = null,
-        val thumbnail: JsonPage? = null,
-    )
-
     @Serializable
     data class JsonPage(
-        @SerialName("t")
-        val type: String? = null,
-        @SerialName("w")
+        val path: String? = null,
         val width: Long? = null,
-        @SerialName("h")
         val height: Long? = null,
+        val thumbnail: String? = null,
     )
 
     @Serializable
@@ -188,15 +180,16 @@ class NHentai(delegate: HttpSource, val context: Context) :
     }
 
     override suspend fun getPagePreviewList(manga: SManga, chapters: List<SChapter>, page: Int): PagePreviewPage {
+        if (nhConfig == null) getNhConfig()
         val metadata = fetchOrLoadMetadata(manga.id()) {
             client.newCall(mangaDetailsRequest(manga)).awaitSuccess()
         }
         return PagePreviewPage(
             page,
-            metadata.pageImageTypes.mapIndexed { index, s ->
+            metadata.pageImagePreviewUrls.mapIndexed { index, path ->
                 PagePreviewInfo(
                     index + 1,
-                    imageUrl = thumbnailUrlFromType(metadata.mediaId!!, metadata.mediaServer ?: 1, index + 1, s)!!,
+                    imageUrl = "$thumbServer/$path",
                 )
             },
             false,
@@ -204,15 +197,24 @@ class NHentai(delegate: HttpSource, val context: Context) :
         )
     }
 
-    private fun thumbnailUrlFromType(
-        mediaId: String,
-        mediaServer: Int,
-        page: Int,
-        t: String,
-    ) = NHentaiSearchMetadata.typeToExtension(t)?.let {
-        "https://t$mediaServer.nhentai.net/galleries/$mediaId/${page}t.$it"
+    var nhConfig: JsonConfig? = null
+    suspend fun getNhConfig() {
+        try {
+            val response =
+                withIOContext { client.newCall(GET("https://nhentai.net/api/v2/config", headers)).awaitSuccess() }
+            val body = response.body.string()
+            nhConfig = jsonParser.decodeFromString<JsonConfig>(body)
+        } catch (_: Exception) {
+            nhConfig = JsonConfig(
+                (1..4).map { n -> "https://i$n.nhentai.net" },
+                (1..4).map { n -> "https://t$n.nhentai.net" },
+            )
+        }
     }
 
+    val thumbServer
+        get() = nhConfig?.thumbServers?.random()
+
     override suspend fun fetchPreviewImage(page: PagePreviewInfo, cacheControl: CacheControl?): Response {
         return client.newCachelessCallWithProgress(
             if (cacheControl != null) {
@@ -230,10 +232,6 @@ class NHentai(delegate: HttpSource, val context: Context) :
         private val jsonParser = Json {
             ignoreUnknownKeys = true
         }
-
-        private val GALLERY_JSON_REGEX = Regex(".parse\\(\"(.*)\"\\);")
-        private val MEDIA_SERVER_REGEX = Regex("media_server\\s*:\\s*(\\d+)")
-        private val UNICODE_ESCAPE_REGEX = Regex("\\\\u([0-9a-fA-F]{4})")
         private const val TITLE_PREF = "Display manga title as:"
     }
 }

app/src/main/java/exh/ui/metadata/adapters/NHentaiDescriptionAdapter.kt

@@ -60,8 +60,8 @@ fun NHentaiDescription(state: State.Success, openMetadataViewer: () -> Unit) {
 
             binding.pages.text = context.pluralStringResource(
                 SYMR.plurals.num_pages,
-                meta.pageImageTypes.size,
-                meta.pageImageTypes.size,
+                meta.pageImagePreviewUrls.size,
+                meta.pageImagePreviewUrls.size,
             )
             binding.pages.bindDrawable(context, R.drawable.ic_baseline_menu_book_24)