#oauth changed GoogleController for the jwt flow ( using a common token if we connect from our app or from google )

src/Infrastructure/Utils/GenerateJwtToken.cs

@@ -0,0 +1,31 @@
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+using Microsoft.IdentityModel.Tokens;
+
+namespace Hutopy.Infrastructure.Utils;
+
+public static class JwtTokenHelper
+{
+    public static string GenerateJwtToken(string issuer, string audience, string key, string userId)
+    {
+        var claims = new[]
+        {
+            new Claim(JwtRegisteredClaimNames.Sub, userId),
+            new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
+            new Claim(ClaimTypes.NameIdentifier, userId)
+        };
+
+        var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key));
+        var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);
+
+        var token = new JwtSecurityToken(
+            issuer: issuer,
+            audience: audience,
+            claims: claims,
+            expires: DateTime.Now.AddMinutes(30),
+            signingCredentials: credentials);
+
+        return new JwtSecurityTokenHandler().WriteToken(token);
+    }
+}

src/Infrastructure/Utils/RandomGenerator.cs

@@ -0,0 +1,58 @@
+using System.Text;
+
+namespace Hutopy.Infrastructure.Utils;
+
+// If we need to add special characters we can alternate between 2 pools.
+public class RandomGenerator
+{
+    // For the moment, numbers and special characters don't work because
+    // the random generator is designed to handle a single integer.
+    // We can modify this in the future.
+    private const string LetterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                                       + "0123456789"
+                                       + "!@#$%^&*()_+"
+                                       + "-=[];',./`~{}|:\"<>?";
+    private const int LetterIdxBits = 6;
+    private const int LetterIdxMask = 1 << LetterIdxBits;
+    private const int LetterIdxMax = 64 / LetterIdxBits;
+
+    private static readonly Random Src = new();
+
+    public static byte[] RandBytesMaskSrc(int n)
+    {
+        var b = new byte[n];
+
+        for (var i = n - 1; i >= 0;)
+        {
+            long cache = Src.NextInt64();
+            int remain = LetterIdxMax;
+
+            while (remain != 0)
+            {
+                if (i < 0)
+                    break;
+
+                if (cache == 0)
+                    cache = Src.NextInt64();
+
+                var idx = (int)(cache & LetterIdxMask);
+                if (idx < LetterBytes.Length)
+                {
+                    b[i] = (byte)LetterBytes[idx];
+                    i--;
+                }
+
+                cache >>= LetterIdxBits;
+                remain--;
+            }
+        }
+
+        return b;
+    }
+    
+    public static string RandomString(int length)
+    {
+        var bytes = RandBytesMaskSrc(length);
+        return Encoding.UTF8.GetString(bytes); // Equivalent for *(string*)(&bytes[0])
+    }
+}