Added Offline mode

libpupil/src/main/java/xyz/quaver/hiyobi/reader.kt

@@ -16,11 +16,15 @@ var cookie: String = ""
 fun renewCookie() : String {
     val url = "https://$hiyobi/"
 
-    with(URL(url).openConnection() as HttpsURLConnection) {
-        setRequestProperty("User-Agent", user_agent)
-        connectTimeout = 2000
-        connect()
-        return headerFields["Set-Cookie"]!![0]
+    try {
+        with(URL(url).openConnection() as HttpsURLConnection) {
+            setRequestProperty("User-Agent", user_agent)
+            connectTimeout = 2000
+            connect()
+            return headerFields["Set-Cookie"]!![0]
+        }
+    } catch (e: Exception) {
+        return ""
     }
 }
 
@@ -30,19 +34,23 @@ fun getReader(galleryId: Int) : Reader {
     if (cookie.isEmpty())
         cookie = renewCookie()
 
-    val json = Json(JsonConfiguration.Stable).parseJson(
-        with(URL(url).openConnection() as HttpsURLConnection) {
-            setRequestProperty("User-Agent", user_agent)
-            setRequestProperty("Cookie", cookie)
-            connectTimeout = 2000
-            connect()
+    try {
+        val json = Json(JsonConfiguration.Stable).parseJson(
+            with(URL(url).openConnection() as HttpsURLConnection) {
+                setRequestProperty("User-Agent", user_agent)
+                setRequestProperty("Cookie", cookie)
+                connectTimeout = 2000
+                connect()
 
-            inputStream.bufferedReader().use { it.readText() }
+                inputStream.bufferedReader().use { it.readText() }
+            }
+        )
+
+        return json.jsonArray.map {
+            val name = it.jsonObject["name"]!!.content
+            ReaderItem("https://$hiyobi/data/$galleryId/$name", null)
         }
-    )
-
-    return json.jsonArray.map {
-        val name = it.jsonObject["name"]!!.content
-        ReaderItem("https://$hiyobi/data/$galleryId/$name", null)
+    } catch (e: Exception) {
+        return emptyList()
     }
 }