fix: improve GetNonce method in C#, Swift and php, and add some test code

csharp/core/Common.cs

@@ -3,8 +3,10 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Diagnostics;
 using System.Reflection;
 using System.Runtime.InteropServices;
+using System.Security.Cryptography;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading;
@@ -22,10 +24,14 @@ namespace AlibabaCloud.TeaUtil
     public static class Common
     {
         private static readonly string _defaultUserAgent;
+        private static readonly long _processStartTime;
+        private static long _seqId = 0;
 
         static Common()
         {
             _defaultUserAgent = GetDefaultUserAgent();
+            double ticks = (DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalSeconds;
+            _processStartTime = (long)(ticks * 1000);
         }
 
         public static byte[] ToBytes(string val)
@@ -127,7 +133,17 @@ public async static Task<byte[]> ReadAsBytesAsync(Stream stream)
 
         public static string GetNonce()
         {
-            return Guid.NewGuid().ToString();
+            int threadId = Thread.CurrentThread.ManagedThreadId;
+            long currentTime = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
+            long seq = Interlocked.Increment(ref seqId);
+            long randNum = new Random().NextInt64();
+            string msg = string.Format("{0}-{1}-{2}-{3}", _processStartTime, threadId, currentTime, seq, randNum);
+            using (MD5 md5 = MD5.Create())
+            {
+                byte[] hash = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(msg));
+                return BitConverter.ToString(hash).Replace("-", "").ToLower();
+            }
+            //return Guid.NewGuid().ToString();
         }
 
         public static string GetDateUTCString()

csharp/tests/CommonTest.cs

@@ -135,6 +135,8 @@ public async void Test_ReadAsBytesAsync()
         public void Test_GetNonce()
         {
             Assert.NotNull(Common.GetNonce());
+            Assert.Equal(32, Common.GetNonce().length);
+            Assert.IsFalse(Common.GetNonce() == Common.GetNonce());
         }
 
         [Fact]

php/src/Utils.php

@@ -9,6 +9,8 @@
 class Utils
 {
     private static $defaultUserAgent = '';
+    private static $processStartTime = intval(microtime(true) * 1000);
+    private static $seqId = 0;
 
     /**
      * Convert a string(utf8) to bytes.
@@ -111,7 +113,15 @@ public static function readAsJSON($stream)
      */
     public static function getNonce()
     {
-        return md5(uniqid() . uniqid(md5(microtime(true)), true));
+        $processId = getmypid();
+        $currentTime = intval(microtime(true) * 1000);
+        $seq = self::$seqId;
+        self::$seqId += 1;
+        $randNum = random_int(0, PHP_INT_MAX);
+        $msg = sprintf("%d-%d-%d-%d-%d", self::$processStartTime, $processId, $currentTime, $randNum);
+        $md5 = md5($msg);
+        return $md5;
+        // return md5(uniqid() . uniqid(md5(microtime(true)), true));
     }
 
     /**

swift/Sources/TeaUtils/Client.swift

@@ -4,6 +4,9 @@ import Tea
 
 
 public class Client {
+    private static var processStartTime = Int64(Date().timeIntervalSince1970 * 1000)
+    private static var seqId: Int64 = 0
+
     public static func toBytes(_ str: String?) -> [UInt8] {
         str?.toBytes() ?? []
     }
@@ -62,9 +65,18 @@ public class Client {
     }
 
     public static func getNonce() -> String {
-        let timestamp: TimeInterval = Date().toTimestamp()
-        let timestampStr: String = String(timestamp)
-        return (timestampStr + UUID().uuidString).md5()
+        let threadId = UInt64(Thread.current.threadIdentifier)
+        let currentTime = Int(Date().timeIntervalSince1970 * 1000)
+        let seq = seqId
+        seqId += 1
+        let randNum = UInt64.random(in: 0...UInt64.max)
+        let msg = "\(processStartTime)-\(threadId)-\(currentTime)-\(seq)-\(randNum)"
+        let md5 = Insecure.MD5.hash(data: msg.data(using: .utf8)!)
+        return md5.map { String(format: "%02hhx", $0) }.joined()
+
+        // let timestamp: TimeInterval = Date().toTimestamp()
+        // let timestampStr: String = String(timestamp)
+        // return (timestampStr + UUID().uuidString).md5()
     }
 
     public static func getDateUTCString() -> String {

swift/Tests/TeaUtilsTests/TeaUtilsTests.swift

@@ -118,6 +118,7 @@ final class ClientTests: XCTestCase {
 
     func testGetNonce() {
         XCTAssertEqual(32, (Client.getNonce().lengthOfBytes(using: .utf8)))
+        XCTAssertFalse(Client.getNonce() == Client.getNonce())
     }
 
     func testGetDateUTCString() {