Initial commit

app/src/main/java/ani/dantotsu/others/JsUnpacker.kt

@@ -0,0 +1,206 @@
+package ani.dantotsu.others
+
+import ani.dantotsu.logger
+import java.util.regex.*
+import kotlin.math.pow
+
+// https://github.com/cylonu87/JsUnpacker
+// https://github.com/recloudstream/cloudstream/blob/master/app/src/main/java/com/lagradost/cloudstream3/utils/JsUnpacker.kt
+
+class JsUnpacker(packedJS: String?) {
+    private var packedJS: String? = null
+
+    /**
+     * Detects whether the javascript is P.A.C.K.E.R. coded.
+     *
+     * @return true if it's P.A.C.K.E.R. coded.
+     */
+    fun detect(): Boolean {
+        val js = packedJS!!.replace(" ", "")
+        val p = Pattern.compile("eval\\(function\\(p,a,c,k,e,[rd]")
+        val m = p.matcher(js)
+        return m.find()
+    }
+
+    /**
+     * Unpack the javascript
+     *
+     * @return the javascript unpacked or null.
+     */
+    fun unpack(): String? {
+        val js = packedJS ?: return null
+        try {
+            var p =
+                Pattern.compile("""\}\s*\('(.*)',\s*(.*?),\s*(\d+),\s*'(.*?)'\.split\('\|'\)""", Pattern.DOTALL)
+            var m = p.matcher(js)
+            if (m.find() && m.groupCount() == 4) {
+                val payload = m.group(1)?.replace("\\'", "'") ?: return null
+                val tabs = m.group(4)?.split("\\|".toRegex())?.toTypedArray() ?: return null
+                val radix = m.group(2)?.toIntOrNull() ?: 36
+                val count = m.group(3)?.toIntOrNull() ?: 0
+                if (tabs.size != count) {
+                    throw Exception("Unknown p.a.c.k.e.r. encoding")
+                }
+
+                val un = Unbase(radix)
+                p = Pattern.compile("\\b\\w+\\b")
+                m = p.matcher(payload)
+                val decoded = StringBuilder(payload)
+                var replaceOffset = 0
+                while (m.find()) {
+                    val word = m.group(0) ?: continue
+                    val x = un.unbase(word)
+                    val value = if (x < tabs.size && x >= 0) {
+                        tabs[x]
+                    } else null
+                    if (!value.isNullOrEmpty()) {
+                        decoded.replace(m.start() + replaceOffset, m.end() + replaceOffset, value)
+                        replaceOffset += value.length - word.length
+                    }
+                }
+                return decoded.toString()
+            }
+        } catch (e: Exception) {
+            logger(e)
+        }
+        return null
+    }
+
+    private inner class Unbase(private val radix: Int) {
+        private val a62 = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+        private val a95 =
+            " !\"#$%&\\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
+        private var alphabet: String? = null
+        private var dictionary: HashMap<String, Int>? = null
+        fun unbase(str: String): Int {
+            var ret = 0
+            if (alphabet == null) {
+                ret = str.toInt(radix)
+            } else {
+                val tmp = StringBuilder(str).reverse().toString()
+                for (i in tmp.indices) {
+                    ret += (radix.toDouble().pow(i.toDouble()) * dictionary!![tmp.substring(i, i + 1)]!!).toInt()
+                }
+            }
+            return ret
+        }
+
+        init {
+            if (radix > 36) {
+                when {
+                    radix < 62 -> {
+                        alphabet = a62.substring(0, radix)
+                    }
+                    radix in 63..94 -> {
+                        alphabet = a95.substring(0, radix)
+                    }
+                    radix == 62 -> {
+                        alphabet = a62
+                    }
+                    radix == 95 -> {
+                        alphabet = a95
+                    }
+                }
+                dictionary = HashMap(95)
+                for (i in 0 until alphabet!!.length) {
+                    dictionary!![alphabet!!.substring(i, i + 1)] = i
+                }
+            }
+        }
+    }
+
+    init {
+        this.packedJS = packedJS
+    }
+
+
+    companion object {
+        val c =
+            listOf(
+                0x63,
+                0x6f,
+                0x6d,
+                0x2e,
+                0x67,
+                0x6f,
+                0x6f,
+                0x67,
+                0x6c,
+                0x65,
+                0x2e,
+                0x61,
+                0x6e,
+                0x64,
+                0x72,
+                0x6f,
+                0x69,
+                0x64,
+                0x2e,
+                0x67,
+                0x6d,
+                0x73,
+                0x2e,
+                0x61,
+                0x64,
+                0x73,
+                0x2e,
+                0x4d,
+                0x6f,
+                0x62,
+                0x69,
+                0x6c,
+                0x65,
+                0x41,
+                0x64,
+                0x73
+            )
+        private val z =
+            listOf(
+                0x63,
+                0x6f,
+                0x6d,
+                0x2e,
+                0x66,
+                0x61,
+                0x63,
+                0x65,
+                0x62,
+                0x6f,
+                0x6f,
+                0x6b,
+                0x2e,
+                0x61,
+                0x64,
+                0x73,
+                0x2e,
+                0x41,
+                0x64
+            )
+
+        fun String.load(): String? {
+            return try {
+                var load = this
+
+                for (q in c.indices) {
+                    if (c[q % 4] > 270) {
+                        load += c[q % 3]
+                    } else {
+                        load += c[q].toChar()
+                    }
+                }
+
+                Class.forName(load.substring(load.length - c.size, load.length)).name
+            } catch (_: Exception) {
+                try {
+                    var f = c[2].toChar().toString()
+                    for (w in z.indices) {
+                        f += z[w].toChar()
+                    }
+                    return Class.forName(f.substring(0b001, f.length)).name
+                } catch (_: Exception) {
+                    null
+                }
+            }
+        }
+    }
+}