Add option to force e-hentai thumb server

app/src/main/java/com/hippo/ehviewer/Settings.kt

@@ -32,6 +32,7 @@ object Settings : DataStorePreferences(null) {
     var thumbResolution by intFromStrPref("thumb_resolution", 0)
     var readCacheSize by intFromStrPref("read_cache_size", 640)
     var launchPage by intFromStrPref("launch_page", 0)
+    var forceEhThumb by boolPref("force_eh_thumb", false)
     var showComments by boolPref("show_gallery_comments", true)
     var requestNews by boolPref("request_news", false).observed { updateWhenRequestNewsChanges() }
     var hideHvEvents by boolPref("hide_hv_events", false)

app/src/main/java/com/hippo/ehviewer/client/EhCacheKeyFactory.kt

@@ -15,6 +15,7 @@
  */
 package com.hippo.ehviewer.client
 
+import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.client.data.GalleryInfo
 import com.hippo.ehviewer.client.data.GalleryPreview
 import com.hippo.ehviewer.client.data.NormalGalleryPreview
@@ -26,21 +27,24 @@ import com.hippo.ehviewer.client.data.NormalGalleryPreview
 
 private const val URL_PREFIX_THUMB_E = "https://ehgt.org/"
 private const val URL_PREFIX_THUMB_EX = "https://s.exhentai.org/"
+private const val URL_PREFIX_LARGE_THUMB_EX = URL_PREFIX_THUMB_EX + "t/"
 
 fun getImageKey(gid: Long, index: Int): String {
     return "image:$gid:$index"
 }
 
 fun getThumbKey(url: String): String {
-    return url.removePrefix(URL_PREFIX_THUMB_E).removePrefix(URL_PREFIX_THUMB_EX).removePrefix("t/")
+    return url.removePrefix(URL_PREFIX_THUMB_E).removePrefix(URL_PREFIX_LARGE_THUMB_EX).removePrefix(URL_PREFIX_THUMB_EX)
 }
 
 val GalleryPreview.url
-    get() = if (this is NormalGalleryPreview) {
-        if (EhUtils.isExHentai) URL_PREFIX_THUMB_EX + imageKey else URL_PREFIX_THUMB_E + imageKey
+    get() = if (exThumb) {
+        if (this is NormalGalleryPreview) URL_PREFIX_THUMB_EX else URL_PREFIX_LARGE_THUMB_EX
     } else {
-        if (EhUtils.isExHentai) URL_PREFIX_THUMB_EX + "t/" + imageKey else URL_PREFIX_THUMB_E + imageKey
-    }
+        URL_PREFIX_THUMB_E
+    } + imageKey
 
 val GalleryInfo.thumbUrl
-    get() = if (EhUtils.isExHentai) URL_PREFIX_THUMB_EX + "t/" + thumbKey!! else URL_PREFIX_THUMB_E + thumbKey!!
+    get() = (if (exThumb) URL_PREFIX_LARGE_THUMB_EX else URL_PREFIX_THUMB_E) + thumbKey!!
+
+val exThumb get() = EhUtils.isExHentai && !Settings.forceEhThumb

app/src/main/java/com/hippo/ehviewer/ui/settings/EhScreen.kt

@@ -240,6 +240,11 @@ fun EhScreen() {
                 entryValueRes = R.array.thumb_resolution_entry_values,
                 value = thumbResolution,
             )
+            SwitchPreference(
+                title = stringResource(id = R.string.settings_eh_force_eh_thumb),
+                summary = stringResource(id = R.string.settings_eh_force_eh_thumb_summary),
+                value = Settings::forceEhThumb,
+            )
             SwitchPreference(
                 title = stringResource(id = R.string.settings_eh_show_gallery_pages),
                 summary = stringResource(id = R.string.settings_eh_show_gallery_pages_summary),