chore: refactoring RandomUtil class

now we use window.crypto.getRandomValues to generate random values.

Author: shishkevichd

web/assets/js/model/inbound.js

@@ -1050,7 +1050,7 @@ class Allocate extends XrayCommonClass {
 
 class Inbound extends XrayCommonClass {
     constructor(
-        port = RandomUtil.randomIntRange(10000, 60000),
+        port = RandomUtil.randomInteger(10000, 60000),
         listen = '',
         protocol = Protocols.VLESS,
         settings = null,
@@ -1226,7 +1226,7 @@ class Inbound extends XrayCommonClass {
     }
 
     reset() {
-        this.port = RandomUtil.randomIntRange(10000, 60000);
+        this.port = RandomUtil.randomInteger(10000, 60000);
         this.listen = '';
         this.protocol = Protocols.VMESS;
         this.settings = Inbound.Settings.getSettings(Protocols.VMESS);

web/assets/js/util/index.js

@@ -80,59 +80,48 @@ class PromiseUtil {
     }
 }
 
-const seq = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');
-
 class RandomUtil {
-    static randomIntRange(min, max) {
-        return Math.floor(Math.random() * (max - min) + min);
+    static getSeq({ hasNumbers = true, hasLowercase = true, hasUppercase = true } = {}) {
+        let seq = '';
+        if (hasNumbers) seq += "0123456789";
+        if (hasLowercase) seq += "abcdefghijklmnopqrstuvwxyz";
+        if (hasUppercase) seq += "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+        return seq;
     }
 
-    static randomInt(n) {
-        return this.randomIntRange(0, n);
+    static randomInteger(min, max) {
+        const range = max - min + 1;
+        const randomBuffer = new Uint32Array(1);
+        window.crypto.getRandomValues(randomBuffer);
+        return Math.floor((randomBuffer[0] / (0xFFFFFFFF + 1)) * range) + min;
     }
 
-    static randomSeq(count) {
-        let str = '';
-        for (let i = 0; i < count; ++i) {
-            str += seq[this.randomInt(62)];
-        }
-        return str;
+    static randomSeq(count, options = {}) {
+        const seq = this.getSeq(options);
+        const seqLength = seq.length;
+        const randomValues = new Uint32Array(count);
+        window.crypto.getRandomValues(randomValues);
+        return Array.from(randomValues, v => seq[v % seqLength]).join('');
     }
 
     static randomShortIds() {
-        const lengths = [2, 4, 6, 8, 10, 12, 14, 16];
-        for (let i = lengths.length - 1; i > 0; i--) {
-            const j = Math.floor(Math.random() * (i + 1));
-            [lengths[i], lengths[j]] = [lengths[j], lengths[i]];
-        }
-
-        let shortIds = [];
-        for (let length of lengths) {
-            let shortId = '';
-            for (let i = 0; i < length; i++) {
-                shortId += seq[this.randomInt(16)];
-            }
-            shortIds.push(shortId);
-        }
-        return shortIds.join(',');
+        const lengths = [2, 4, 6, 8, 10, 12, 14, 16].sort(() => Math.random() - 0.5);
+        const seq = this.getSeq();
+        return lengths.map(len => this.randomSeq(len)).join(',');
     }
 
     static randomLowerAndNum(len) {
-        let str = '';
-        for (let i = 0; i < len; ++i) {
-            str += seq[this.randomInt(36)];
-        }
-        return str;
+        return this.randomSeq(len, { hasUppercase: false });
     }
 
     static randomUUID() {
-        return window.crypto.randomUUID()
+        return window.crypto.randomUUID();
     }
 
     static randomShadowsocksPassword() {
-        let array = new Uint8Array(32);
+        const array = new Uint8Array(32);
         window.crypto.getRandomValues(array);
-        return Base64.encode(String.fromCharCode.apply(null, array));
+        return Base64.encode(String.fromCharCode(...array));
     }
 }
 

web/html/xui/inbounds.html

@@ -927,7 +927,7 @@
                     expiryTime: dbInbound.expiryTime,
 
                     listen: '',
-                    port: RandomUtil.randomIntRange(10000, 60000),
+                    port: RandomUtil.randomInteger(10000, 60000),
                     protocol: baseInbound.protocol,
                     settings: Inbound.Settings.getSettings(baseInbound.protocol).toString(),
                     streamSettings: baseInbound.stream.toString(),