made url gen function a bit less shit

index.js

@@ -8,35 +8,29 @@ addEventListener('fetch', event => {
 
 const AESKEY = [106, 111, 54, 97, 101, 121, 54, 104, 97, 105, 100, 50, 84, 101, 105, 104]
 
+function str2bin(str) {
+    return new Uint8Array(Array.from(str).map(function (item) {
+        return item.charCodeAt(0);
+    }))
+}
+
 async function url_gen(md5_origin, format, id, media_version) {
     const cipher = new aesjs.ModeOfOperation.ecb(AESKEY)
 
-    result = [md5_origin, format, id, media_version].join('\xa4')
+    let result = [md5_origin, format, id, media_version].join('\xa4')
 
-    buf = new ArrayBuffer(result.length);
+    let result_md5 = await crypto.subtle.digest('MD5', str2bin(result))
-    result_hash = new Uint8Array(buf);
+
-    for (i = 0; i < result.length; i++) {
+    result_md5 = aesjs.utils.hex.fromBytes(new Uint8Array(result_md5))
-        result_hash[i] = result.charCodeAt(i);
+
+    result = result_md5 + '\xa4' + result + '\xa4'
+
+    // zero-padding
+    if (result.length % 16) {
+        result += '\x00'.repeat(16 - result.length % 16)
     }
-    result_hash = await crypto.subtle.digest('MD5', result_hash)
-    result_hash = Array.from(new Uint8Array(result_hash))
-    result_hash = result_hash.reduce(function(previous, current) {
-        return previous + '0'.concat(current.toString(16)).substr(-2, 2);
-    }, ''),
 
-    result = result_hash + '\xa4' + result + '\xa4'
+    result = aesjs.utils.hex.fromBytes(cipher.encrypt(str2bin(result)))
-
-    // padding
-    result += '\x00'.repeat(result.length % 16 ? 16 - result.length % 16 : 0)
-
-    // converting to array for encryption / hex string
-    result = Array.from(result).map(function(item) {
-        return item.charCodeAt(0);
-    })
-    // encryption / hex string
-    result = (result = cipher.encrypt(result)).reduce(function(previous, current) {
-        return previous + '0'.concat(current.toString(16)).substr(-2, 2);
-    }, '')
 
     // cdn template with first character of md5 string + hash
     return `https://cdns-proxy-${md5_origin[0]}.dzcdn.net/api/1/${result}`