feat(utils): add Jshunter deobfuscator (#250)

* feat(utils): add Jshunter deobfuscator

Co-authored-by: contusionglory <102427829+contusionglory@users.noreply.github.com>

app/src/main/java/com/lagradost/cloudstream3/utils/JsHunter.kt

@@ -0,0 +1,88 @@
+package com.lagradost.cloudstream3.utils
+
+import com.lagradost.cloudstream3.mvvm.logError
+import java.util.regex.Matcher
+import java.util.regex.Pattern
+import kotlin.math.pow
+
+//author: https://github.com/daarkdemon
+class JsHunter(private val hunterJS: String) {
+
+    /**
+     * Detects whether the javascript is H.U.N.T.E.R coded.
+     *
+     * @return true if it's H.U.N.T.E.R coded.
+     */
+    fun detect(): Boolean {
+        val p = Pattern.compile("eval\\(function\\(h,u,n,t,e,r\\)")
+        val searchResults = p.matcher(hunterJS)
+        return searchResults.find()
+    }
+
+    /**
+     * Unpack the javascript
+     *
+     * @return the javascript unhunt or null.
+     */
+
+    fun dehunt(): String? {
+        try {
+            val p: Pattern =
+                Pattern.compile(
+                    """}\("([^"]+)",[^,]+,\s*"([^"]+)",\s*(\d+),\s*(\d+)""",
+                    Pattern.DOTALL
+                )
+            val searchResults: Matcher = p.matcher(hunterJS)
+            if (searchResults.find() && searchResults.groupCount() == 4) {
+                val h = searchResults.group(1)!!.toString()
+                val n = searchResults.group(2)!!.toString()
+                val t = searchResults.group(3)!!.toInt()
+                val e = searchResults.group(4)!!.toInt()
+                return hunter(h, n, t, e)
+            }
+        } catch (e: Exception) {
+            logError(e)
+        }
+        return null
+    }
+
+    private fun duf(d: String, e: Int, f: Int = 10): Int {
+        val str = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ+/"
+        val g = str.toList()
+        val h = g.take(e)
+        val i = g.take(f)
+        val dList = d.reversed().toList()
+        var j = 0.0
+        for ((c, b) in dList.withIndex()) {
+            if (b in h) {
+                j += h.indexOf(b) * e.toDouble().pow(c)
+            }
+        }
+        var k = ""
+        while (j > 0) {
+            k = i[(j % f).toInt()] + k
+            j = (j - j % f) / f
+        }
+        return k.toIntOrNull() ?: 0
+    }
+
+    private fun hunter(h: String, n: String, t: Int, e: Int): String {
+        var result = ""
+        var i = 0
+        while (i < h.length) {
+            var j = 0
+            var s = ""
+            while (h[i] != n[e]) {
+                s += h[i]
+                i++
+            }
+            while (j < n.length) {
+                s = s.replace(n[j], j.digitToChar())
+                j++
+            }
+            result += (duf(s, e) - t).toChar()
+            i++
+        }
+        return result
+    }
+}