Merge Features.Auth and Features.UserManagement into Features.Users

web/backend/Features/Features.Users/Services/TokenService.cs

@@ -0,0 +1,150 @@
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using Domain.Exceptions;
+using Features.Auth.Identity;
+using Infrastructure.Configuration;
+using Infrastructure.Jwt;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.Extensions.Configuration;
+
+namespace Features.Auth.Services;
+
+/// <summary>
+///     Default implementation of <see cref="ITokenService" /> that generates and validates JWTs
+///     for access, refresh, and confirmation flows using secrets read from configuration.
+/// </summary>
+public class TokenService : ITokenService
+{
+    private readonly string _accessTokenSecret;
+    private readonly string _confirmationTokenSecret;
+    private readonly string _refreshTokenSecret;
+    private readonly ITokenInfrastructure _tokenInfrastructure;
+    private readonly UserManager<ApplicationUser> _userManager;
+
+    /// <exception cref="InvalidOperationException">
+    ///     Thrown when any of the <c>ACCESS_TOKEN_SECRET</c>, <c>REFRESH_TOKEN_SECRET</c>, or
+    ///     <c>CONFIRMATION_TOKEN_SECRET</c> configuration values are not set.
+    /// </exception>
+    public TokenService(
+        ITokenInfrastructure tokenInfrastructure,
+        UserManager<ApplicationUser> userManager,
+        IConfiguration configuration
+    )
+    {
+        _tokenInfrastructure = tokenInfrastructure;
+        _userManager = userManager;
+
+        _accessTokenSecret = ConfigurationHelpers.GetKeyOrThrow(
+            configuration,
+            ConfigurationKeys.AccessTokenSecret
+        );
+
+        _refreshTokenSecret = ConfigurationHelpers.GetKeyOrThrow(
+            configuration,
+            ConfigurationKeys.RefreshTokenSecret
+        );
+
+        _confirmationTokenSecret = ConfigurationHelpers.GetKeyOrThrow(
+            configuration,
+            ConfigurationKeys.ConfirmationTokenSecret
+        );
+    }
+
+    /// <inheritdoc />
+    public string GenerateAccessToken(Guid userId, string username)
+    {
+        DateTime expiresAt = DateTime.UtcNow.AddHours(TokenServiceExpirationHours.AccessTokenHours);
+        return _tokenInfrastructure.GenerateJwt(userId, username, expiresAt, _accessTokenSecret);
+    }
+
+    /// <inheritdoc />
+    public string GenerateRefreshToken(Guid userId, string username)
+    {
+        DateTime expiresAt = DateTime.UtcNow.AddHours(
+            TokenServiceExpirationHours.RefreshTokenHours
+        );
+        return _tokenInfrastructure.GenerateJwt(userId, username, expiresAt, _refreshTokenSecret);
+    }
+
+    /// <inheritdoc />
+    public string GenerateConfirmationToken(Guid userId, string username)
+    {
+        DateTime expiresAt = DateTime.UtcNow.AddHours(
+            TokenServiceExpirationHours.ConfirmationTokenHours
+        );
+        return _tokenInfrastructure.GenerateJwt(
+            userId,
+            username,
+            expiresAt,
+            _confirmationTokenSecret
+        );
+    }
+
+    /// <inheritdoc />
+    public async Task<ValidatedToken> ValidateRefreshTokenAsync(string token)
+    {
+        return await ValidateTokenInternalAsync(token, _refreshTokenSecret, "refresh");
+    }
+
+    /// <inheritdoc />
+    public async Task<ValidatedToken> ValidateConfirmationTokenAsync(string token)
+    {
+        return await ValidateTokenInternalAsync(token, _confirmationTokenSecret, "confirmation");
+    }
+
+    /// <inheritdoc />
+    public async Task<RefreshTokenResult> RefreshTokenAsync(string refreshTokenString)
+    {
+        ValidatedToken validated = await ValidateRefreshTokenAsync(refreshTokenString);
+        ApplicationUser? user = await _userManager.FindByIdAsync(validated.UserId.ToString());
+        if (user == null)
+            throw new UnauthorizedException("User account not found");
+
+        string newAccess = GenerateAccessToken(user.Id, user.UserName);
+        string newRefresh = GenerateRefreshToken(user.Id, user.UserName);
+
+        return new RefreshTokenResult(user.Id, user.UserName, newRefresh, newAccess);
+    }
+
+    /// <summary>
+    ///     Performs the shared validation logic for access, refresh, and confirmation tokens:
+    ///     validates the JWT signature/expiration, then extracts and parses the user ID and username claims.
+    /// </summary>
+    /// <param name="tokenType">A human-readable label (e.g. "access", "refresh", "confirmation") used in error messages.</param>
+    /// <exception cref="UnauthorizedException">
+    ///     Thrown when required claims are missing, the user ID claim is not a valid <see cref="Guid" />,
+    ///     or the underlying token validation fails for any other reason (e.g. expired or invalid signature).
+    /// </exception>
+    private async Task<ValidatedToken> ValidateTokenInternalAsync(
+        string token,
+        string secret,
+        string tokenType
+    )
+    {
+        try
+        {
+            ClaimsPrincipal principal = await _tokenInfrastructure.ValidateJwtAsync(token, secret);
+
+            string? userIdClaim = principal.FindFirst(JwtRegisteredClaimNames.Sub)?.Value;
+            string? usernameClaim = principal.FindFirst(JwtRegisteredClaimNames.UniqueName)?.Value;
+
+            if (string.IsNullOrEmpty(userIdClaim) || string.IsNullOrEmpty(usernameClaim))
+                throw new UnauthorizedException(
+                    $"Invalid {tokenType} token: missing required claims"
+                );
+
+            if (!Guid.TryParse(userIdClaim, out Guid userId))
+                throw new UnauthorizedException($"Invalid {tokenType} token: malformed user ID");
+
+            return new ValidatedToken(userId, usernameClaim, principal);
+        }
+        catch (UnauthorizedException)
+        {
+            throw;
+        }
+        catch (Exception e)
+        {
+            throw new UnauthorizedException($"Failed to validate {tokenType} token: {e.Message}");
+        }
+    }
+}