Unscramble obfuscated code.

Tetdesu · Jul 24, 2021 · 893e3bb · 893e3bb
1 parent a41ebeb
commit 893e3bb
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Showing 2 changed files with 14 additions and 20 deletions.
diff --git a/plugin/js/parsers/MangaHereParser.js b/plugin/js/parsers/MangaHereParser.js
@@ -131,7 +131,7 @@ class MangaHereParser extends Parser {
 
     static decryptChapterFun(js, prefix) {
         let d = MangaHereParser.extractDataFromjs(js);
-        let clearText = MangaHereParser.decrypt(d[0], d[1], d[2], d[3].split("|"), 0, {});
+        let clearText = MangaHereParser.decrypt(d[0], d[1], d[2], d[3].split("|"));
         return MangaHereParser.extractFilenameFromClearText(clearText, prefix);
     }
 
@@ -152,23 +152,19 @@ class MangaHereParser extends Parser {
         return urls.map(u => "http:" + prefix + u.replace(/"/g, ""));
     }
 
-    // extracted from MangaHere
-    static decrypt(p, a, c, k, e, d) {
-        e = function (c) {
-            return (c < a ? "" : e(parseInt(c / a))) + ((c = c % a) > 35 ? String.fromCharCode(c + 29) : c.toString(36))
+    // extracted from MangaHere (and deobfuscated)
+    static decrypt(p, max, len, fragments) {
+        let makeKey = function (index) {
+            return (index < max ? "" : makeKey(parseInt(index / max))) + ((index = index % max) > 35 ? String.fromCharCode(index + 29) : index.toString(36))
         };
-        if (!"".replace(/^/, String)) {
-            while (c--)
-                d[e(c)] = k[c] || e(c);
-            k = [function (e) {
-                return d[e]
-            }];
-            e = function () { return "\\w+" };
-            c = 1;
-        };
-        while (c--)
-            if (k[c])
-                p = p.replace(new RegExp("\\b" + e(c) + "\\b", "g"), k[c]);
+        let replacements = {};
+        while (len--)
+        {
+            let key = makeKey(len);
+            replacements[key] = fragments[len] || key;
+        }
+        let replacerFunction = (key) => replacements[key];
+        p = p.replace(new RegExp("\\b\\w+\\b", "g"), replacerFunction);
         return p;        
     }
 }

diff --git a/unitTest/UtestMangaHereParser.js b/unitTest/UtestMangaHereParser.js
@@ -16,9 +16,7 @@ test("decrypt", function (assert) {
         "l b(){3 4=\"//a.e.9/5/c/6/7.1/8\";3 2=[\"/k.j?o=n&m=h\"];f(3 i=0;i<2.g;i++){p(i==0){2[i]=\"//a.e.9/5/c/6/7.1/8\"+2[i];t}2[i]=4+2[i]}r 2}3 d;d=b();q=s;",
         30,
         30,
-        "||pvalue|var|pix|store|11110|061|compressed|cc||dm5imagefun|manga||mangahere|for|length|1548025200||jpg|k20190103_161010_2748|function|ttl|c9cbbe3a58535b9040d5d23708a3d5d7d6d2a89a|token|if|currentimageid|return|14300825|continue".split("|"),
-        0,
-        {}
+        "||pvalue|var|pix|store|11110|061|compressed|cc||dm5imagefun|manga||mangahere|for|length|1548025200||jpg|k20190103_161010_2748|function|ttl|c9cbbe3a58535b9040d5d23708a3d5d7d6d2a89a|token|if|currentimageid|return|14300825|continue".split("|")
     );
     let filtered = MangaHereParser.extractFilenameFromClearText(actual);
     assert.equal(filtered, "http://a.mangahere.cc/store/manga/11110/061.1/compressed/k20190103_161010_2748.jpg?token=c9cbbe3a58535b9040d5d23708a3d5d7d6d2a89a&ttl=1548025200");