SpyFakku: Add `Random` Filter (#5411)

src/en/spyfakku/build.gradle

@@ -1,7 +1,7 @@
 ext {
     extName = 'SpyFakku'
     extClass = '.SpyFakku'
-    extVersionCode = 8
+    extVersionCode = 9
     isNsfw = true
 }
 

src/en/spyfakku/src/eu/kanade/tachiyomi/extension/en/spyfakku/Filters.kt

@@ -32,4 +32,5 @@ private val getSortsList: List<Pair<String, String>> = listOf(
     Pair("Date Added", "created_at"),
     Pair("Date Released", "released_at"),
     Pair("Pages", "pages"),
+    Pair("Random", "random"),
 )

src/en/spyfakku/src/eu/kanade/tachiyomi/extension/en/spyfakku/SpyFakku.kt

@@ -27,6 +27,7 @@ import java.text.SimpleDateFormat
 import java.util.Locale
 import java.util.TimeZone
 import java.util.concurrent.TimeUnit
+import kotlin.random.Random
 
 class SpyFakku : HttpSource() {
 
@@ -48,6 +49,8 @@ class SpyFakku : HttpSource() {
         .rateLimit(2, 1, TimeUnit.SECONDS)
         .build()
 
+    private val charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+
     override fun headersBuilder() = super.headersBuilder()
         .set("Referer", "$baseUrl/")
         .set("Origin", baseUrl)
@@ -76,6 +79,7 @@ class SpyFakku : HttpSource() {
                 when (filter) {
                     is SortFilter -> {
                         addQueryParameter("sort", filter.getValue())
+                        if (filter.getValue() == "random") addQueryParameter("seed", generateSeed())
                         addQueryParameter("order", if (filter.state!!.ascending) "asc" else "desc")
                     }
 
@@ -298,6 +302,17 @@ class SpyFakku : HttpSource() {
         return json.decodeFromString(body.string())
     }
 
+    private fun generateSeed(): String {
+        val length = Random.nextInt(4, 9)
+        val string = StringBuilder(length)
+
+        for (i in 0 until length) {
+            string.append(charset.random())
+        }
+
+        return string.toString()
+    }
+
     override fun imageUrlParse(response: Response): String = throw UnsupportedOperationException()
     override fun latestUpdatesRequest(page: Int): Request = throw UnsupportedOperationException()
     override fun latestUpdatesParse(response: Response) = throw UnsupportedOperationException()