fix RCO (#16900)

* lib-synchrony

ported from aniyomiorg/aniyomi-extensions

Co-authored-by: jmir1 <43830312+jmir1@users.noreply.github.com>

* RCO: deobfuscate and extract beau function from rguard script

* fix genre filter

* bump

---------

Co-authored-by: jmir1 <43830312+jmir1@users.noreply.github.com>

lib/synchrony/build.gradle.kts

@@ -0,0 +1,22 @@
+plugins {
+    id("com.android.library")
+    kotlin("android")
+}
+
+android {
+    compileSdk = AndroidConfig.compileSdk
+    namespace = "eu.kanade.tachiyomi.lib.synchrony"
+
+    defaultConfig {
+        minSdk = AndroidConfig.minSdk
+        targetSdk = AndroidConfig.targetSdk
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compileOnly(libs.bundles.common)
+}

lib/synchrony/src/main/java/eu/kanade/tachiyomi/lib/synchrony/Deobfuscator.kt

@@ -0,0 +1,43 @@
+package eu.kanade.tachiyomi.lib.synchrony
+
+import app.cash.quickjs.QuickJs
+
+/**
+ * Helper class to deobfuscate JavaScript strings with synchrony.
+ */
+object Deobfuscator {
+    fun deobfuscateScript(source: String): String? {
+        val originalScript = javaClass.getResource("/assets/$SCRIPT_NAME")
+            ?.readText() ?: return null
+
+        // Sadly needed until QuickJS properly supports module imports:
+        // Regex for finding one and two in "export{one as Deobfuscator,two as Transformer};"
+        val regex = """export\{(.*) as Deobfuscator,(.*) as Transformer\};""".toRegex()
+        val synchronyScript = regex.find(originalScript)?.let { match ->
+            val (deob, trans) = match.destructured
+            val replacement = "const Deobfuscator = $deob, Transformer = $trans;"
+            originalScript.replace(match.value, replacement)
+        } ?: return null
+
+        return QuickJs.create().use { engine ->
+            engine.evaluate("globalThis.console = { log: () => {}, warn: () => {}, error: () => {}, trace: () => {} };")
+            engine.evaluate(synchronyScript)
+
+            engine.set(
+                "source", TestInterface::class.java,
+                object : TestInterface {
+                    override fun getValue() = source
+                },
+            )
+            engine.evaluate("new Deobfuscator().deobfuscateSource(source.getValue())") as? String
+        }
+    }
+
+    @Suppress("unused")
+    private interface TestInterface {
+        fun getValue(): String
+    }
+}
+
+// Update this when the script is updated!
+private const val SCRIPT_NAME = "synchrony-v2.4.2.1.js"