Mangago: Workaround obfuscation and add icons

src/en/mangago/build.gradle

@@ -5,9 +5,13 @@ ext {
     appName = 'Tachiyomi: Mangago'
     pkgNameSuffix = "en.mangago"
     extClass = '.Mangago'
-    extVersionCode = 1
+    extVersionCode = 2
     extVersionSuffix = 1
-    libVersion = '1.0'
+    libVersion = '1.2'
 }
 
 apply from: "$rootDir/common.gradle"
+
+dependencies {
+    provided project(':duktape-stub')
+}

src/en/mangago/src/eu/kanade/tachiyomi/extension/en/mangago/Mangago.kt

@@ -1,12 +1,21 @@
 package eu.kanade.tachiyomi.extension.en.mangago
 
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.graphics.Canvas
+import android.graphics.Rect
 import android.net.Uri
+import com.squareup.duktape.Duktape
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.source.model.*
 import eu.kanade.tachiyomi.source.online.ParsedHttpSource
+import okhttp3.MediaType
 import okhttp3.Request
+import okhttp3.ResponseBody
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
+import java.io.ByteArrayOutputStream
+import java.io.InputStream
 import java.text.SimpleDateFormat
 import java.util.*
 
@@ -20,7 +29,18 @@ class Mangago : ParsedHttpSource() {
     override val name = "Mangago"
     override val baseUrl = "https://www.mangago.me"
 
-    override val client = network.cloudflareClient!!
+    override val client = network.cloudflareClient.newBuilder().addInterceptor { chain ->
+        val request = chain.request()
+        val response = chain.proceed(request)
+        if(!request.url().pathSegments().contains("cspiclink")) return@addInterceptor response
+
+        val res = response.body()!!.byteStream().use {
+            decodeImage(request.url().toString(), it)
+        }
+
+        val rb = ResponseBody.create(MediaType.parse("image/png"), res)
+        response.newBuilder().body(rb).build()
+    }.build()
 
     //Hybrid selector that selects manga from either the genre listing or the search results
     private val genreListingSelector = ".updatesli"
@@ -136,13 +156,52 @@ class Mangago : ParsedHttpSource() {
         date_upload = dateFormat.parse(element.getElementsByClass("no").text().trim()).time
     }
 
-    private val JS_BEGIN_MARKER = "var imgsrcs = new Array('"
+    fun decodeImage(url: String,
+                    img: InputStream): ByteArray {
+        val decoded = BitmapFactory.decodeStream(img)
+
+        val js = "var img = '$url';" +
+                "var width = ${decoded.width};" +
+                "var height = ${decoded.height};" +
+                IMAGE_DESCRAMBLER_JS
+        val strRes = Duktape.create().use {
+            it.evaluate(js) as String
+        }
+
+        val result = Bitmap.createBitmap(decoded.width,
+                decoded.height,
+                Bitmap.Config.ARGB_8888)
+        val canvas = Canvas(result)
+
+        val arrayRes = strRes.split(" ").filter(String::isNotBlank).map {
+            it.split(",").filter(String::isNotBlank).map(String::toInt)
+        }
+        arrayRes.forEach { (srcX, srcY, chunkWidth, chunkHeight, destX, destY) ->
+            canvas.drawBitmap(decoded,
+                    Rect(srcX, srcY, srcX + chunkWidth, srcY + chunkHeight),
+                    Rect(destX, destY, destX + chunkWidth, destY + chunkHeight),
+                    null)
+        }
+
+        val output = ByteArrayOutputStream()
+        result.compress(Bitmap.CompressFormat.PNG, 100, output)
+        return output.toByteArray()
+    }
+
+    private val JS_BEGIN_MARKER = "var imgsrcs = '"
+    private val JS_END_MARKER = "';"
     override fun pageListParse(document: Document): List<Page> {
-        val dString = document.toString()
-        val jsBegin = dString.indexOf(JS_BEGIN_MARKER) + JS_BEGIN_MARKER.length
-        val jsEnd = dString.indexOf("');", startIndex = jsBegin)
-        val arrString = dString.substring(jsBegin .. jsEnd)
-        return arrString.split("','").mapIndexed { i, s ->
+        val imgSrc = document.getElementsByTag("script").map {
+            it.data().trim()
+        }.find {
+            it.startsWith(JS_BEGIN_MARKER) && it.endsWith(JS_END_MARKER)
+        } ?: throw IllegalArgumentException("Cannot decode imgsrcs!")
+
+        val res = Duktape.create().use {
+            it.evaluate(imgSrc + IMGSRCS_DECODE_JS) as String
+        }
+
+        return res.split(",").mapIndexed { i, s ->
             Page(i, s, s)
         }
     }
@@ -248,4 +307,82 @@ class Mangago : ParsedHttpSource() {
     private interface UriFilter {
         fun addToUri(uri: Uri.Builder)
     }
+
+    companion object {
+        private const val IMGSRCS_DECODE_JS = """
+
+function replacePos(a, b, l) {
+    return a.substr(0, b) + l + a.substring(b + 1, a.length)
+}
+
+function dorder(a, b) {
+    var l = a.length;
+    for (j = 3; 2 <= j; j--)
+        for (i = l - 1; 0 <= i - (b[j] - 0); i--) 0 != i % 2 && (temp = a[i - (b[j] - 0)], a = replacePos(a, i - (b[j] - 0), a[i]), a = replacePos(a, i, temp));
+    for (j = 1; 0 <= j; j--)
+        for (i = l - 1; 0 <= i - (b[j] - 0); i--) 0 != i % 2 && (temp = a[i - (b[j] - 0)], a = replacePos(a, i - (b[j] - 0), a[i]), a = replacePos(a, i, temp));
+    return a
+}
+
+(function() {
+    return dorder(imgsrcs, "6857");
+})();
+"""
+
+        private const val IMAGE_DESCRAMBLER_JS = """
+(function() {
+            var _deskeys = [];
+_deskeys["60a2b0ed56cd458c4633d04b1b76b7e9"] = "18a72a69a64a13a1a43a3aa42a23a66a26a19a51a54a78a34a17a31a35a15a58a29a61a48a73a74a44a52a60a24a63a20a32a7a45a53a75a55a62a59a41a76a68a2a36a21a10a38a33a71a40a67a22a4a50a80a65a27a37a47a70a14a28a16a6a56a30a57a5a11a79a9a77a46a39a25a49a8a12";
+_deskeys["400df5e8817565e28b2e141c533ed7db"] = "61a74a10a45a3a37a72a22a57a39a25a56a52a29a70a60a67a41a63a55a27a28a43a18a5a9a8a40a17a48a44a79a38a47a32a73a4a6a13a34a33a49a2a42a50a76a54a36a35a14a58a7a69a46a16a30a21a11aa51a53a77a26a31a1a19a20a80a24a62a68a59a66a75a12a64a78a71a15a65a23";
+_deskeys["84ba0d8098f405b14f4dbbcc04c93bac"] = "61a26a35a16a55a10a72a37a2a60a66a65a33a44a7a28a70a62a32a56a30a40a58a15a74a47aa36a78a75a11a6a77a67a39a23a9a31a64a59a13a24a80a14a38a45a21a63a19a51a17a34a50a46a5a29a73a8a57a69a48a68a49a71a41a12a52a18a79a76a54a42a22a4a1a3a53a20a25a43a27";
+_deskeys["56665708741979f716e5bd64bf733c33"] = "23a7a41a48a57a27a69a36a76a62a40a75a26a2a51a6a10a65a43a24a1aa20a71a28a30a13a38a79a78a72a14a49a55a56a58a25a70a12a80a3a66a11a39a42a17a15a54a45a34a74a31a8a61a46a73a63a22a64a19a77a50a9a59a37a68a52a18a32a16a33a60a67a21a44a53a5a35a4a29a47";
+_deskeys.a67e15ed870fe4aab0a502478a5c720f = "8a12a59a52a24a13a37a21a55a56a41a71a65a43a40a66a11a79a67a44a33a20a72a2a31a42a29a34a58a60a27a48a28a15a35a51a76a80a0a63a69a53a39a46a64a50a75a1a57a9a62a74a18a16a73a14a17a6a19a61a23a38a10a3a32a26a36a54a4a30a45a47a70a22a7a68a49a77a5a25a78";
+_deskeys.b6a2f75185754b691e4dfe50f84db57c = "47a63a76a58a37a4a56a21a1a48a62a2a36a44a34a42a23a9a60a72a11a74a70a20a77a16a15a35a69a0a55a46a24a6a32a75a68a43a41a78a31a71a52a33a67a25a80a30a5a28a40a65a39a14a29a64a3a53a49a59a12a66a38a27a79a45a18a22a8a61a50a17a51a10a26a13a57a19a7a54a73";
+_deskeys.db99689c5a26a09d126c7089aedc0d86 = "57a31a46a61a55a41a26a2a39a24a75a4a45a13a23a51a15a8a64a37a72a34a12a3a79a42a80a17a62a49a19a77a48a68a78a65a14a10a29a16a20a76a38a36a54a30a53a40a33a21a44a22a32a5a1a7a70a67a58a0a71a74a43a66a6a63a35a56a73a9a27a25a59a47a52a11a50a18a28a60a69";
+_deskeys["37abcb7424ce8df47ccb1d2dd9144b49"] = "67a45a39a72a35a38a61a11a51a60a13a22a31a25a75a30a74a43a69a50a6a26a16a49a77a68a59a64a17a56a18a1a10a54a44a62a53a80a5a23a48a32a29a79a24a70a28a58a71a3a52a42a55a9a14a36a73a34a2a27a57a0a21a41a33a37a76a8a40a65a7a20a12a19a47a4a78a15a63a66a46";
+_deskeys["874b83ba76a7e783d13abc2dabc08d76"] = "26a59a42a43a4a20a61a28a12a64a37a52a2a77a34a13a46a74a70a0a44a29a73a66a55a38a69a67a62a9a63a6a54a79a21a33a8a58a40a47a71a49a22a50a57a78a56a25a17a15a36a16a48a32a5a10a14a80a24a72a76a45a3a53a23a41a60a11a65a19a27a51a68a35a31a1a75a39a30a7a18";
+_deskeys.d320d2647d70c068b89853e1a269c609 = "77a38a53a40a16a3a20a18a63a9a24a64a50a61a45a59a27a37a8a34a11a55a79a13a47a68a12a22a46a33a1a69a52a54a31a23a62a43a0a2a35a28a57a36a51a78a70a5a32a75a41a30a4a80a19a21a42a71a49a10a56a74a17a7a25a6a14a73a29a44a48a39a60a58a15a66a67a72a65a76a26";
+_deskeys["930b87ad89c2e2501f90d0f0e92a6b97"] = "9a29a49a67a62a40a28a50a64a77a46a31a16a73a14a45a51a44a7a76a22a78a68a37a74a69a25a65a41a11a52aa18a36a10a38a12a15a2a58a48a8a27a75a20a4a80a61a55a42a13a43a47a39a35a60a26a30a63a66a57a33a72a24a71a34a23a3a70a54a56a32a79a5a21a6a59a53a17a1a19";
+_deskeys.c587e77362502aaedad5b7cddfbe3a0d = "50aa59a70a68a30a56a10a49a43a45a29a23a28a61a15a40a71a14a44a32a34a17a26a63a76a75a33a74a12a11a21a67a31a19a80a7a64a8a3a51a53a38a18a6a42a27a9a52a20a41a60a1a22a77a16a54a47a79a24a78a2a46a37a73a65a36a35a39a5a4a25a72a13a62a55a57a58a69a66a48";
+_deskeys["1269606c6c3d8bb6508426468216d6b1"] = "49a15a0a60a14a26a34a69a61a24a35a4a77a80a70a40a39a6a68a17a41a56a28a46a79a16a21a1a37a42a44a58a78a18a52a73a32a9a12a50a8a13a20a19a67a36a45a75a48a10a65a7a38a66a3a2a43a27a29a31a72a74a55a23a54a22a59a57a11a62a47a53a30a5a64a25a76a71a51a33a63";
+_deskeys["33a3b21bb2d14a09d15f995224ae4284"] = "30a59a35a34a42a8a10a56a70a64a48a69a26a18a6a16a54a24a73a79a68a33a32a2a63a53a31a14a17a57a41a80a76a40a60a12a43a29a39a4a77a58a66a36a38a52a13a19a0a75a28a55a25a61a71a11a67a49a23a45a5a15a1a50a51a9a44a47a65a74a72a27a7a37a46a20a22a62a78a21a3";
+_deskeys["9ae6640761b947e61624671ef841ee78"] = "62a25a21a75a42a61a73a59a23a19a66a38a71a70a6a55a3a16a43a32a53a37a41a28a49a63a47a17a7a30a78a46a20a67a56a79a65a14a69a60a8a52a22a9a24a2a4a13a36a27a0a18a33a12a44a5a76a26a29a40a1a11a64a48a39a51a80a72a68a10a58a35a77a54a34a74a57a31a50a45a15";
+_deskeys.f4ab0903149b5d94baba796a5cf05938 = "40a37a55a73a18a42a15a59a50a13a22a63a52a58a6a80a47a17a38a71a74a70a30a11a10a19a0a31a36a21a51a68a1a3a14a66a45a2a79a7a76a75a8a67a20a78a25a69a43a28a35a60a4a23a65a54a34a9a5a39a27a57a26a33a12a24a46a72a56a44a49a61a64a29a53a48a32a62a41a16a77";
+_deskeys.f5baf770212313f5e9532ec5e6103b61 = "55a69a78a75a38a25a20a60a6a80a46a5a48a18a23a24a17a67a64a70a63a57a22a10a49a19a8a16a11a12a61a76a34a27a54a73a44a0a56a3a15a29a28a13a4a2a7a77a74a35a37a26a30a58a9a71a50a1a43a79a47a32a14a53a52a66a72a59a68a31a42a45a62a51a40a39a33a65a41a36a21";
+_deskeys.e2169a4bfd805e9aa21d3112d498d68c = "54a34a68a69a26a20a66a1a67a74a22a39a63a70a5a37a75a15a6a14a62a50a46a35a44a45a28a8a40a25a29a76a51a77a17a47a0a42a2a9a48a27a13a64a58a57a18a30a80a23a61a36a60a59a71a32a7a38a41a78a12a49a43a79a24a31a52a19a3a53a72a10a73a11a33a16a4a55a65a21a56";
+
+var l = "18a72a69a64a13a1a43a3aa42a23a66a26a19a51a54a78a34a17a31a35a15a58a29a61a48a73a74a44a52a60a24a63a20a32a7a45a53a75a55a62a59a41a76a68a2a36a21a10a38a33a71a40a67a22a4a50a80a65a27a37a47a70a14a28a16a6a56a30a57a5a11a79a9a77a46a39a25a49a8a12";
+  for (mk in _deskeys) {
+    if (img.indexOf(mk) > 0) {
+      l = _deskeys[mk];
+      break;
+    }
+  }
+  l = l.split("a");
+  var cols = heightnum = 9;
+  var w = width / cols;
+  var h = height / heightnum;
+  var r;
+  var y;
+  var x;
+  var py;
+  var canvasX;
+  var i = 0;
+  var result = "";
+  for (;i < cols * heightnum;i++) {
+    r = Math.floor(l[i] / heightnum);
+    y = r * h;
+    x = (l[i] - r * cols) * w;
+    r = Math.floor(i / cols);
+    py = r * h;
+    canvasX = (i - r * cols) * w;
+    result += " " + canvasX + "," + py + "," + w + "," + h + "," + x + "," + y;
+  }
+  return result;
+})();
+            """
+
+        // Allow destructuring up to 6 items for lists
+        private operator fun <T> List<T>.component6() = get(5)
+    }
 }