Fix invalid generated password when login with facebook or google

backend/src/Web/Common/Security/PasswordGenerator.cs

@@ -1,4 +1,5 @@
-using System.Text;
+using System.Security.Cryptography;
+using System.Text;
 
 namespace Hutopy.Web.Common.Security;
 
@@ -13,15 +14,18 @@ public static class PasswordGenerator
     private static readonly Random Random = new();
 
     public static string GeneratePassword(
-        int minLength,
+        int length = 15,
-        int maxLength,
         bool requireNumber = true,
+        bool requireLowercase = true,
         bool requireCapital = true,
         bool requireSpecialCharacter = true)
     {
         // Create pools based on the requirements
-        var characterPool = new StringBuilder(LowerLetters);
+        var characterPool = new StringBuilder();
 
+        if (requireNumber)
+            characterPool.Append(LowerLetters);
+        
         if (requireCapital)
             characterPool.Append(UpperLetters);
 
@@ -32,12 +36,14 @@ public static class PasswordGenerator
             characterPool.Append(SpecialCharacters);
 
         // Ensure that the length is within the specified bounds
-        int length = Random.Next(minLength, maxLength + 1);
         var password = new char[length];
 
         // Ensure at least one character from each required category is included
         int index = 0;
         
+        if (requireLowercase)
+            password[index++] = LowerLetters[Random.Next(LowerLetters.Length)];
+        
         if (requireCapital)
             password[index++] = UpperLetters[Random.Next(UpperLetters.Length)];
         
@@ -46,11 +52,11 @@ public static class PasswordGenerator
         
         if (requireSpecialCharacter)
             password[index++] = SpecialCharacters[Random.Next(SpecialCharacters.Length)];
-
+        
-        // Fill the rest of the password
+        // Fill the rest with the password
         for (int i = index; i < length; i++)
         {
-            password[i] = characterPool[Random.Next(characterPool.Length)];
+            password[i] = characterPool[RandomNumberGenerator.GetInt32(characterPool.Length)];
         }
 
         // Shuffle the password to randomize the placement of the required characters

backend/src/Web/Features/Users/Handlers/LoginWithFacebook.cs

@@ -83,7 +83,7 @@ public class LoginWithFacebookHandler(
         
         if (user is null)
         {
-            var generatedPassword = PasswordGenerator.GeneratePassword(10, 12);
+            var generatedPassword = PasswordGenerator.GeneratePassword();
             var generatedUser = new IdentityUser
             {
                 UserName = userInfo.Email ?? $"fb_{userInfo.Id}",

backend/src/Web/Features/Users/Handlers/LoginWithGoogle.cs

@@ -90,7 +90,7 @@ public class LoginWithGoogleHandler(
         
         if (user is null)
         {
-            var generatedPassword = PasswordGenerator.GeneratePassword(10, 12);
+            var generatedPassword = PasswordGenerator.GeneratePassword();
             var generatedUser = new IdentityUser
             {
                 UserName = userInfo.Email,