Initial commit

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

@@ -0,0 +1,42 @@
+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
+        }
+    }
+
+    private interface TestInterface {
+        fun getValue(): String
+    }
+}
+
+// Update this when the script is updated!
+private const val SCRIPT_NAME = "synchrony-v2.4.2.1.js"