Document auth flow

Distribution/Features/Auth/AuthController.cs

@@ -1,15 +1,37 @@
+using Distribution.Infra.Authorization;
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 
 namespace Distribution.Features.Auth;
 
 [ApiController]
 [Route("api/auth")]
-public class AuthController(AuthService service) : ControllerBase
+public class AuthController(AuthService service, ICurrentUserService currentUser) : ControllerBase
 {
+    private static IActionResult ToActionResult(AuthHexResponse result) =>
+        result.Success ? new OkObjectResult(result) : new ObjectResult(result) { StatusCode = result.StatusCode is >= 400 and < 600 ? result.StatusCode : 401 };
+
     [HttpPost("login")]
-    public async Task<IActionResult> Login(LoginRequest request)
+    public async Task<IActionResult> Login(LoginRequest request, CancellationToken ct) =>
+        ToActionResult(await service.LoginAsync(request, ct));
+
+    [HttpPost("register")]
+    public async Task<IActionResult> Register(RegisterRequest request, CancellationToken ct) =>
+        ToActionResult(await service.RegisterAsync(request, ct));
+
+    [HttpGet("me")]
+    [Authorize]
+    public async Task<IActionResult> Me(CancellationToken ct)
     {
-        var result = await service.LoginAsync(request);
-        return result is null ? Unauthorized() : Ok(result);
+        var userId = currentUser.UserId ?? throw new UnauthorizedAccessException();
+        return ToActionResult(await service.GetUserDetailsAsync(userId, ct));
+    }
+
+    [HttpPost("logout")]
+    [Authorize]
+    public async Task<IActionResult> Logout(CancellationToken ct)
+    {
+        var token = Request.Headers.Authorization.ToString().Replace("Bearer ", "", StringComparison.OrdinalIgnoreCase);
+        return ToActionResult(await service.LogoutAsync(token, ct));
     }
 }

Distribution/Features/Auth/AuthDTOs.cs

@@ -2,4 +2,4 @@ namespace Distribution.Features.Auth;
 
 public record LoginRequest(string Username, string Password);
 
-public record LoginResponse(string Token, Guid UserId, string Username, string RoleName);
+public record RegisterRequest(string Username, string Password, string? FullName);

Distribution/Features/Auth/AuthService.cs

@@ -1,24 +1,24 @@
-using Distribution.Features.User;
 using Distribution.Infra.Authorization;
-using Microsoft.AspNetCore.Identity;
 
 namespace Distribution.Features.Auth;
 
-public class AuthService(IUserRepository userRepo, IJwtTokenService tokenService)
+/// <summary>
+/// Own-user auth is fully delegated to AuthHex — this service only proxies the four functions
+/// AuthHex exposes (loginUser/registerUser/getUserDetails/LogoutUser). No local password check or
+/// token issuance happens here; AuthHex owns credentials and signs the JWT this app validates
+/// (see Program.cs's JwtBearer registration + OnTokenValidated role mapping).
+/// </summary>
+public class AuthService(IAuthHexClient authHex)
 {
-    private readonly PasswordHasher<Models.User> _hasher = new();
+    public Task<AuthHexResponse> LoginAsync(LoginRequest request, CancellationToken ct = default) =>
+        authHex.CallAsync("loginUser", request, reference: Guid.NewGuid().ToString(), ct: ct);
 
-    public async Task<LoginResponse?> LoginAsync(LoginRequest request)
-    {
-        var user = await userRepo.GetByUsernameAsync(request.Username);
-        if (user is null || !user.IsActive)
-            return null;
+    public Task<AuthHexResponse> RegisterAsync(RegisterRequest request, CancellationToken ct = default) =>
+        authHex.CallAsync("registerUser", request, reference: Guid.NewGuid().ToString(), ct: ct);
 
-        var result = _hasher.VerifyHashedPassword(user, user.PasswordHash, request.Password);
-        if (result == PasswordVerificationResult.Failed)
-            return null;
+    public Task<AuthHexResponse> GetUserDetailsAsync(Guid userId, CancellationToken ct = default) =>
+        authHex.CallAsync("getUserDetails", new { userId }, ct: ct);
 
-        var token = tokenService.GenerateToken(user);
-        return new LoginResponse(token, user.Id, user.Username, user.Role?.Name ?? string.Empty);
-    }
+    public Task<AuthHexResponse> LogoutAsync(string token, CancellationToken ct = default) =>
+        authHex.CallAsync("LogoutUser", new { token }, ct: ct);
 }

Distribution/Infra/Authorization/AuthHex/AuthHexClient.cs

@@ -0,0 +1,21 @@
+using System.Net.Http.Json;
+
+namespace Distribution.Infra.Authorization;
+
+/// <summary>
+/// Proxies own-user auth calls (login/register/getUserDetails/logout) to the external AuthHex
+/// identity service. AuthHex owns credentials and issues the RS256-signed JWT this app validates
+/// (see JwtTokenService's replacement — token generation is no longer done locally); this app
+/// never sees or stores a plaintext/hashed password for the AuthHex-authenticated flow.
+/// </summary>
+public class AuthHexClient(HttpClient http) : IAuthHexClient
+{
+    public async Task<AuthHexResponse> CallAsync(string functionName, object? payload, string? reference = null, CancellationToken ct = default)
+    {
+        var body = new { functionName, payload, reference };
+        var response = await http.PostAsJsonAsync("/api/user", body, ct);
+
+        var result = await response.Content.ReadFromJsonAsync<AuthHexResponse>(cancellationToken: ct);
+        return result ?? new AuthHexResponse((int)response.StatusCode, false, "Empty response from AuthHex.", null);
+    }
+}

Distribution/Infra/Authorization/AuthHex/AuthHexResponse.cs

@@ -0,0 +1,11 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Distribution.Infra.Authorization;
+
+/// <summary>Raw response shape returned by AuthHex's `/api/user` endpoint for every functionName.</summary>
+public record AuthHexResponse(
+    [property: JsonPropertyName("statusCode")] int StatusCode,
+    [property: JsonPropertyName("success")] bool Success,
+    [property: JsonPropertyName("message")] string? Message,
+    [property: JsonPropertyName("data")] JsonElement? Data);

Distribution/Infra/Authorization/AuthHex/IAuthHexClient.cs

@@ -0,0 +1,6 @@
+namespace Distribution.Infra.Authorization;
+
+public interface IAuthHexClient
+{
+    Task<AuthHexResponse> CallAsync(string functionName, object? payload, string? reference = null, CancellationToken ct = default);
+}

Distribution/Infra/Authorization/Jwt/IJwtTokenService.cs

@@ -1,6 +0,0 @@
-namespace Distribution.Infra.Authorization;
-
-public interface IJwtTokenService
-{
-    string GenerateToken(Models.User user);
-}

Distribution/Infra/Authorization/Jwt/JwtTokenService.cs

@@ -1,47 +0,0 @@
-using System.IdentityModel.Tokens.Jwt;
-using System.Security.Claims;
-using System.Text;
-using Microsoft.Extensions.Configuration;
-using Microsoft.IdentityModel.Tokens;
-
-namespace Distribution.Infra.Authorization;
-
-public class JwtTokenService : IJwtTokenService
-{
-    private readonly IConfiguration _configuration;
-
-    public JwtTokenService(IConfiguration configuration)
-    {
-        _configuration = configuration;
-    }
-
-    public string GenerateToken(Models.User user)
-    {
-        var jwtSection = _configuration.GetSection("Jwt");
-        var key = jwtSection["Key"] ?? throw new InvalidOperationException("Jwt:Key is not configured.");
-        var issuer = jwtSection["Issuer"];
-        var audience = jwtSection["Audience"];
-        var expiryMinutes = int.TryParse(jwtSection["ExpiryMinutes"], out var m) ? m : 120;
-
-        var claims = new List<Claim>
-        {
-            new("sub", user.Id.ToString()),
-            new("username", user.Username),
-            new("role", user.Role?.Name ?? string.Empty),
-            new("role_id", user.FK_RoleId.ToString()),
-            new("role_level", (user.Role?.Level ?? 0).ToString())
-        };
-
-        var signingKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key));
-        var credentials = new SigningCredentials(signingKey, SecurityAlgorithms.HmacSha256);
-
-        var token = new JwtSecurityToken(
-            issuer: issuer,
-            audience: audience,
-            claims: claims,
-            expires: DateTime.Now.AddMinutes(expiryMinutes),
-            signingCredentials: credentials);
-
-        return new JwtSecurityTokenHandler().WriteToken(token);
-    }
-}

Distribution/Infra/Authorization/Jwt/RsaXmlKeyReader.cs

@@ -0,0 +1,32 @@
+using System.Security.Cryptography;
+using System.Xml.Linq;
+
+namespace Distribution.Infra.Authorization;
+
+/// <summary>
+/// Parses an XML-format RSA public key (`&lt;RSAKeyValue&gt;...&lt;/RSAKeyValue&gt;`, as issued by
+/// AuthHex) into an <see cref="RSA"/> instance. Written by hand instead of relying on
+/// RSA.FromXmlString, which is Windows-only in .NET (throws PlatformNotSupportedException on
+/// Linux/macOS) — this keeps token validation portable across hosts.
+/// </summary>
+public static class RsaXmlKeyReader
+{
+    public static RSA ReadPublicKey(string xml)
+    {
+        var root = XElement.Parse(xml);
+        var modulus = root.Element("Modulus")?.Value
+            ?? throw new InvalidOperationException("RSA XML key is missing <Modulus>.");
+        var exponent = root.Element("Exponent")?.Value
+            ?? throw new InvalidOperationException("RSA XML key is missing <Exponent>.");
+
+        var parameters = new RSAParameters
+        {
+            Modulus = Convert.FromBase64String(modulus),
+            Exponent = Convert.FromBase64String(exponent)
+        };
+
+        var rsa = RSA.Create();
+        rsa.ImportParameters(parameters);
+        return rsa;
+    }
+}

Distribution/Infra/Authorization/Middleware/ApiResponse.cs

@@ -0,0 +1,10 @@
+namespace Distribution.Infra.Authorization.Middleware;
+
+/// <summary>Stand-in for OSMCore's OMSCore.Common.Models.IOs.ApiResponse&lt;T&gt;, which has no equivalent in this project.</summary>
+public sealed record ApiResponse<T>
+{
+    public int StatusCode { get; init; }
+    public bool Success { get; init; }
+    public string? Message { get; init; }
+    public T? Data { get; init; }
+}

Distribution/Infra/Authorization/Middleware/AuthMiddleware.cs

@@ -0,0 +1,185 @@
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Security.Cryptography;
+using Distribution.Features.User;
+using Distribution.Infra.Authorization;
+using Microsoft.IdentityModel.Tokens;
+
+namespace Distribution.Infra.Authorization.Middleware;
+
+/// <summary>
+/// Ported from OSMCore's System/Authentication/AuthMiddleware.cs (global path-skip-based
+/// middleware). NOT registered in Program.cs — this project's actual token validation is the
+/// standard AddJwtBearer handler (see Program.cs), same as OSMCore's own recommendation. Kept here
+/// unregistered, exactly like OSMCore's own copy, for reference/reuse if a project needs a
+/// middleware-based (rather than AddJwtBearer-based) validation entry point.
+///
+/// Two adaptations from the OSMCore original, both required for this to actually work against
+/// this project's authorization system rather than just compiling:
+/// 1. RSA key parsing goes through <see cref="RsaXmlKeyReader"/> instead of RSA.FromXmlString,
+///    which is Windows-only in modern .NET (see docs/authentication_flow.md §2.2 Gotcha).
+/// 2. After validating the token, the user id is mapped onto a local User/Role row and
+///    role_id/role_level/username claims are attached — the same step Program.cs's
+///    OnTokenValidated performs for the AddJwtBearer path. Without this, a request authenticated
+///    through this middleware would have no role_id claim, and every
+///    [Authorize(Policy = "resource.action")] check (PermissionAuthorizationHandler) would fail.
+/// </summary>
+public sealed class AuthMiddleware(RequestDelegate next, IConfiguration configuration, ILogger<AuthMiddleware> logger)
+{
+    public async Task InvokeAsync(HttpContext context)
+    {
+        if (ShouldSkipAuthentication(context.Request.Path))
+        {
+            await next(context);
+            return;
+        }
+
+        if (!TryGetToken(context, out var token))
+        {
+            await RejectAsync(context, "Authentication token is missing.");
+            return;
+        }
+
+        try
+        {
+            var principal = ValidateToken(token);
+            var userRepo = context.RequestServices.GetRequiredService<IUserRepository>();
+            if (!await TryAttachLocalRoleClaimsAsync(principal, userRepo))
+            {
+                await RejectAsync(context, "User not found or inactive.");
+                return;
+            }
+
+            context.User = principal;
+            PopulateContextItems(context, principal);
+            await next(context);
+        }
+        catch (Exception ex) when (ex is SecurityTokenException or ArgumentException or CryptographicException)
+        {
+            logger.LogInformation(ex, "JWT validation failed for request path {Path}", context.Request.Path);
+            await RejectAsync(context, "Invalid or expired token.");
+        }
+    }
+
+    private ClaimsPrincipal ValidateToken(string token)
+    {
+        var jwtOptions = configuration.GetSection("Jwt").Get<JwtOptions>()
+            ?? throw new InvalidOperationException("Jwt configuration is missing.");
+
+        if (string.IsNullOrWhiteSpace(jwtOptions.PublicKey))
+        {
+            throw new InvalidOperationException("Jwt:PublicKey configuration is missing.");
+        }
+
+        using var rsa = RsaXmlKeyReader.ReadPublicKey(jwtOptions.PublicKey);
+
+        var handler = new JwtSecurityTokenHandler();
+        var parameters = new TokenValidationParameters
+        {
+            ValidateIssuer = true,
+            ValidIssuer = jwtOptions.Issuer,
+            ValidateAudience = true,
+            ValidAudience = jwtOptions.Audience,
+            ValidateIssuerSigningKey = true,
+            IssuerSigningKey = new RsaSecurityKey(rsa),
+            ValidateLifetime = true,
+            ClockSkew = TimeSpan.FromMinutes(1)
+        };
+
+        return handler.ValidateToken(token, parameters, out _);
+    }
+
+    /// <summary>Mirrors Program.cs's OnTokenValidated mapping — see class remarks.</summary>
+    private static async Task<bool> TryAttachLocalRoleClaimsAsync(ClaimsPrincipal principal, IUserRepository userRepo)
+    {
+        var subClaim = principal.FindFirst("sub")?.Value ?? principal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (!Guid.TryParse(subClaim, out var userId))
+            return false;
+
+        var user = await userRepo.GetByIdAsync(userId);
+        if (user is null || !user.IsActive)
+            return false;
+
+        var identity = (ClaimsIdentity)principal.Identity!;
+        identity.AddClaim(new Claim("username", user.Username));
+        identity.AddClaim(new Claim("role_id", user.FK_RoleId.ToString()));
+        identity.AddClaim(new Claim("role_level", (user.Role?.Level ?? 0).ToString()));
+        return true;
+    }
+
+    private static bool TryGetToken(HttpContext context, out string token)
+    {
+        token = string.Empty;
+
+        if (TryGetBearerToken(context.Request.Headers.Authorization, out token))
+        {
+            return true;
+        }
+
+        var headerToken = context.Request.Headers["MobileAuthToken"].FirstOrDefault();
+        if (TryGetBearerToken(headerToken, out token))
+        {
+            return true;
+        }
+
+        var cookieToken = context.Request.Cookies["access_token"];
+        if (!string.IsNullOrWhiteSpace(cookieToken))
+        {
+            token = cookieToken.Trim();
+            return true;
+        }
+
+        return false;
+    }
+
+    private static bool TryGetBearerToken(string? authorizationHeader, out string token)
+    {
+        token = string.Empty;
+
+        if (string.IsNullOrWhiteSpace(authorizationHeader))
+        {
+            return false;
+        }
+
+        const string bearerPrefix = "Bearer ";
+        if (!authorizationHeader.StartsWith(bearerPrefix, StringComparison.OrdinalIgnoreCase))
+        {
+            token = authorizationHeader.Trim();
+            return !string.IsNullOrWhiteSpace(token);
+        }
+
+        token = authorizationHeader[bearerPrefix.Length..].Trim();
+        return !string.IsNullOrWhiteSpace(token);
+    }
+
+    /// <summary>
+    /// Adapted from OSMCore's path list: this project has no Shopify-style webhook route, so that
+    /// skip is dropped; /api/auth is narrowed to just login/register (this project's /api/auth/me
+    /// and /api/auth/logout are meant to require auth, unlike a blanket "/api/auth" skip).
+    /// </summary>
+    private static bool ShouldSkipAuthentication(PathString path)
+        => path.Equals("/health", StringComparison.OrdinalIgnoreCase)
+           || path.Equals("/api/auth/login", StringComparison.OrdinalIgnoreCase)
+           || path.Equals("/api/auth/register", StringComparison.OrdinalIgnoreCase)
+           || path.StartsWithSegments("/swagger", StringComparison.OrdinalIgnoreCase);
+
+    private static void PopulateContextItems(HttpContext context, ClaimsPrincipal principal)
+    {
+        context.Items["UserId"] = principal.FindFirst("sub")?.Value ?? principal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        context.Items["Username"] = principal.FindFirst("username")?.Value;
+        context.Items["RoleId"] = principal.FindFirst("role_id")?.Value;
+        context.Items["RoleLevel"] = principal.FindFirst("role_level")?.Value;
+    }
+
+    private static async Task RejectAsync(HttpContext context, string message)
+    {
+        context.Response.StatusCode = StatusCodes.Status401Unauthorized;
+        await context.Response.WriteAsJsonAsync(new ApiResponse<object>
+        {
+            StatusCode = StatusCodes.Status401Unauthorized,
+            Success = false,
+            Message = message,
+            Data = null
+        });
+    }
+}

Distribution/Infra/Authorization/Middleware/JwtMiddleware.cs

@@ -0,0 +1,191 @@
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Security.Cryptography;
+using Distribution.Features.User;
+using Distribution.Infra.Authorization;
+using Microsoft.AspNetCore.Mvc.Filters;
+using Microsoft.IdentityModel.Tokens;
+
+namespace Distribution.Infra.Authorization.Middleware;
+
+/// <summary>
+/// Ported from OSMCore's System/Authentication/JwtMiddleware.cs (action-filter attribute pattern,
+/// applied per controller/action as [JwtMiddleware.CustomMiddleware]). Not applied anywhere in
+/// this project — the standard AddJwtBearer handler (Program.cs) is this project's actual
+/// validation path.
+///
+/// docs/authentication_flow.md explicitly calls out not running this alongside AuthMiddleware or
+/// AddJwtBearer at the same time — all three independently re-validate the same RSA-signed token,
+/// which is wasteful and error-prone (this is the same duplication OSMCore's own guide flags as a
+/// Gotcha). Kept here, unregistered, only as a ported reference implementation.
+///
+/// Same two adaptations as AuthMiddleware: portable RSA parsing via
+/// <see cref="RsaXmlKeyReader"/>, and local User/Role → role_id/role_level claim mapping after
+/// validation (see AuthMiddleware's remarks for why this is required, not optional).
+/// </summary>
+public sealed class JwtMiddleware
+{
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
+    public sealed class CustomMiddlewareAttribute : Attribute, IAsyncActionFilter
+    {
+        public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
+        {
+            var configuration = context.HttpContext.RequestServices.GetService<IConfiguration>();
+
+            if (!TryGetToken(context.HttpContext, out var token))
+            {
+                await RejectAsync(context.HttpContext, "Authentication token is missing.");
+                return;
+            }
+
+            try
+            {
+                if (configuration is null)
+                {
+                    throw new InvalidOperationException("Jwt configuration is missing.");
+                }
+
+                var principal = ValidateToken(token, configuration);
+
+                var userRepo = context.HttpContext.RequestServices.GetRequiredService<IUserRepository>();
+                if (!await TryAttachLocalRoleClaimsAsync(principal, userRepo))
+                {
+                    await RejectAsync(context.HttpContext, "User not found or inactive.");
+                    return;
+                }
+
+                context.HttpContext.User = principal;
+                PopulateContextItems(context.HttpContext, principal);
+
+                await next();
+            }
+            catch (Exception ex) when (ex is SecurityTokenException or ArgumentException or CryptographicException or InvalidOperationException)
+            {
+                await RejectAsync(context.HttpContext, "Invalid or expired token.");
+            }
+        }
+
+        private static ClaimsPrincipal ValidateToken(string token, IConfiguration configuration)
+        {
+            var xmlKey = configuration["Jwt:PublicKey"];
+
+            if (string.IsNullOrWhiteSpace(xmlKey))
+                throw new SecurityTokenException("JWT public key not configured.");
+
+            using var rsa = RsaXmlKeyReader.ReadPublicKey(xmlKey);
+            var rsaParameters = rsa.ExportParameters(false);
+
+            var key = new RsaSecurityKey(rsaParameters)
+            {
+                KeyId = ComputeKeyId(rsaParameters)
+            };
+
+            var handler = new JwtSecurityTokenHandler();
+            var parameters = new TokenValidationParameters
+            {
+                ValidateIssuer = true,
+                ValidIssuer = configuration["Jwt:Issuer"],
+                ValidateAudience = true,
+                ValidAudience = configuration["Jwt:Audience"],
+                ValidateIssuerSigningKey = true,
+                IssuerSigningKey = key,
+                ValidateLifetime = true,
+                ClockSkew = TimeSpan.FromMinutes(1)
+            };
+
+            return handler.ValidateToken(token, parameters, out _);
+        }
+
+        /// <summary>Mirrors Program.cs's OnTokenValidated mapping — see class remarks.</summary>
+        private static async Task<bool> TryAttachLocalRoleClaimsAsync(ClaimsPrincipal principal, IUserRepository userRepo)
+        {
+            var subClaim = principal.FindFirst("sub")?.Value ?? principal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+            if (!Guid.TryParse(subClaim, out var userId))
+                return false;
+
+            var user = await userRepo.GetByIdAsync(userId);
+            if (user is null || !user.IsActive)
+                return false;
+
+            var identity = (ClaimsIdentity)principal.Identity!;
+            identity.AddClaim(new Claim("username", user.Username));
+            identity.AddClaim(new Claim("role_id", user.FK_RoleId.ToString()));
+            identity.AddClaim(new Claim("role_level", (user.Role?.Level ?? 0).ToString()));
+            return true;
+        }
+
+        private static bool TryGetToken(HttpContext context, out string token)
+        {
+            token = string.Empty;
+
+            if (TryGetBearerToken(context.Request.Headers.Authorization, out token))
+            {
+                return true;
+            }
+
+            var headerToken = context.Request.Headers["MobileAuthToken"].FirstOrDefault();
+            if (TryGetBearerToken(headerToken, out token))
+            {
+                return true;
+            }
+
+            var cookieToken = context.Request.Cookies["access_token"];
+            if (!string.IsNullOrWhiteSpace(cookieToken))
+            {
+                token = cookieToken.Trim();
+                return true;
+            }
+
+            return false;
+        }
+
+        private static bool TryGetBearerToken(string? authorizationHeader, out string token)
+        {
+            token = string.Empty;
+
+            if (string.IsNullOrWhiteSpace(authorizationHeader))
+            {
+                return false;
+            }
+
+            const string bearerPrefix = "Bearer ";
+            if (!authorizationHeader.StartsWith(bearerPrefix, StringComparison.OrdinalIgnoreCase))
+            {
+                token = authorizationHeader.Trim();
+                return !string.IsNullOrWhiteSpace(token);
+            }
+
+            token = authorizationHeader[bearerPrefix.Length..].Trim();
+            return !string.IsNullOrWhiteSpace(token);
+        }
+
+        private static void PopulateContextItems(HttpContext context, ClaimsPrincipal principal)
+        {
+            context.Items["UserId"] = principal.FindFirst("sub")?.Value ?? principal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+            context.Items["Username"] = principal.FindFirst("username")?.Value;
+            context.Items["RoleId"] = principal.FindFirst("role_id")?.Value;
+            context.Items["RoleLevel"] = principal.FindFirst("role_level")?.Value;
+        }
+
+        private static async Task RejectAsync(HttpContext context, string message)
+        {
+            context.Response.StatusCode = StatusCodes.Status401Unauthorized;
+            await context.Response.WriteAsJsonAsync(new ApiResponse<object>
+            {
+                StatusCode = StatusCodes.Status401Unauthorized,
+                Success = false,
+                Message = message,
+                Data = null
+            });
+        }
+
+        private static string ComputeKeyId(RSAParameters publicParameters)
+        {
+            var modulus = publicParameters.Modulus ?? [];
+            var exponent = publicParameters.Exponent ?? [];
+            var payload = $"{Convert.ToBase64String(modulus)}.{Convert.ToBase64String(exponent)}";
+            var hash = SHA256.HashData(System.Text.Encoding.UTF8.GetBytes(payload));
+            return Base64UrlEncoder.Encode(hash);
+        }
+    }
+}

Distribution/Infra/Authorization/Middleware/JwtOptions.cs

@@ -0,0 +1,13 @@
+namespace Distribution.Infra.Authorization.Middleware;
+
+/// <summary>
+/// Ported from OSMCore's System/Authentication/JwtOptions.cs. Binds to the same "Jwt" config
+/// section already used by Program.cs's AddJwtBearer setup (Jwt:PublicKey/Audience/Issuer) — no
+/// new config keys needed.
+/// </summary>
+public sealed record JwtOptions
+{
+    public string PublicKey { get; init; } = string.Empty;
+    public string Audience { get; init; } = string.Empty;
+    public string Issuer { get; init; } = string.Empty;
+}

Distribution/Program.cs

@@ -1,4 +1,4 @@
-using System.Text;
+using System.Security.Claims;
 using Distribution.Data;
 using Distribution.Features.Auth;
 using Distribution.Features.Brand;
@@ -117,7 +117,11 @@ builder.Services.AddScoped<PaymentService>();
 
 builder.Services.AddHttpContextAccessor();
 builder.Services.AddScoped<ICurrentUserService, CurrentUserService>();
-builder.Services.AddScoped<IJwtTokenService, JwtTokenService>();
+builder.Services.AddHttpClient<IAuthHexClient, AuthHexClient>(client =>
+{
+    var baseUrl = builder.Configuration["AuthHex:BaseUrl"] ?? throw new InvalidOperationException("AuthHex:BaseUrl is not configured.");
+    client.BaseAddress = new Uri(baseUrl);
+});
 builder.Services.AddScoped<IPermissionRepository, PermissionRepository>();
 builder.Services.AddScoped<IScopeRepository, ScopeRepository>();
 builder.Services.AddScoped<IPermissionService, PermissionService>();
@@ -126,7 +130,8 @@ builder.Services.AddScoped<IAuthorizationHandler, PermissionAuthorizationHandler
 builder.Services.AddSingleton<IAuthorizationPolicyProvider, PermissionPolicyProvider>();
 
 var jwtSection = builder.Configuration.GetSection("Jwt");
-var jwtKey = jwtSection["Key"] ?? throw new InvalidOperationException("Jwt:Key is not configured.");
+var jwtPublicKeyXml = jwtSection["PublicKey"] ?? throw new InvalidOperationException("Jwt:PublicKey is not configured.");
+var jwtSigningKey = new RsaSecurityKey(RsaXmlKeyReader.ReadPublicKey(jwtPublicKeyXml));
 
 builder.Services.AddAuthentication(options =>
     {
@@ -142,10 +147,43 @@ builder.Services.AddAuthentication(options =>
             ValidateAudience = true,
             ValidAudience = jwtSection["Audience"],
             ValidateIssuerSigningKey = true,
-            IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(jwtKey)),
+            IssuerSigningKey = jwtSigningKey,
             ValidateLifetime = true,
             ClockSkew = TimeSpan.FromMinutes(1)
         };
+
+        // AuthHex issues the token and owns its claim shape; this app's authorization (permission
+        // policies, role-level checks) runs against the *local* Role/Permission tables, so every
+        // validated token is mapped back to a local User/Role once here, not duplicated per
+        // endpoint. A token for a user with no matching local User record is rejected outright —
+        // login via AuthHex does not implicitly provision a local user.
+        options.Events = new JwtBearerEvents
+        {
+            OnTokenValidated = async context =>
+            {
+                var subClaim = context.Principal?.FindFirst("sub")?.Value
+                    ?? context.Principal?.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+
+                if (!Guid.TryParse(subClaim, out var userId))
+                {
+                    context.Fail("Token is missing a valid user id claim.");
+                    return;
+                }
+
+                var userRepo = context.HttpContext.RequestServices.GetRequiredService<IUserRepository>();
+                var user = await userRepo.GetByIdAsync(userId);
+                if (user is null || !user.IsActive)
+                {
+                    context.Fail("User not found or inactive.");
+                    return;
+                }
+
+                var identity = (ClaimsIdentity)context.Principal!.Identity!;
+                identity.AddClaim(new Claim("username", user.Username));
+                identity.AddClaim(new Claim("role_id", user.FK_RoleId.ToString()));
+                identity.AddClaim(new Claim("role_level", (user.Role?.Level ?? 0).ToString()));
+            }
+        };
     });
 
 builder.Services.AddAuthorization();

Distribution/appsettings.json

@@ -10,10 +10,14 @@
   },
   "AllowedHosts": "*",
   "Jwt": {
-    "Key": "CHANGE_ME_dev_only_replace_with_a_long_random_secret_before_deploying",
-    "Issuer": "Distribution.Api",
-    "Audience": "Distribution.Api",
-    "ExpiryMinutes": 120
+    "PublicKey": "<RSAKeyValue><Modulus>1LlNkMBQNdpXJiDal7XMxkG/3ad+YBsMCuY9JD/abHMzniFXtQlovjfbeaaHJ0v1kvSo9731CJ0YC1qhPU5rPQwZwxOWZ9BOBZlMDghONdjOH/HyCUbb5Z18ibqc0QenFSnEYz+jkVZiayj8DV/+VUe+eKzpQTlU6aWtHvlbwfuXaDu+QvFlpLJ7/m8na+0s2nYhLX8Wfi4C/2AoNaYhFkIwYhMMGoaSHuIoQ5R6181Rh0gKvYopRW+IpTD5RV8bXV3AM6zOcoisOifBYROHwA5ZZpoHXuTvHYmPWW8kL8PKme7BwBldPi8KrJUroRE+WXA87aAA5Wtt1oxePcXvhQ==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>",
+    "Audience": "AuthHexClient",
+    "Issuer": "AuthHex"
+    // "ExpiryMinutes": 120
+
+  },
+  "AuthHex": {
+    "BaseUrl": "http://localhost:6102"
   },
   "StoreManagement": {
     "UnverifiedKycOrderThreshold": 0

Distribution/docs/authentication_flow.md

@@ -0,0 +1,102 @@
+# Authentication — Own-User Auth via External Identity Service (AuthHex)
+
+**Status**: Done
+**Depends On**: — (cross-cutting infrastructure, not a numbered feature step)
+
+---
+
+## Goal
+
+Own-user (staff/API) authentication is delegated to an external identity service ("AuthHex"),
+which owns credentials and signs RS256 JWTs. This app validates those tokens and maps them onto
+its own `User`/`Role` tables so the existing permission-policy authorization stays unchanged.
+
+---
+
+## Background / Context
+
+Previously this app verified passwords and minted its own HMAC-signed JWT locally. That's been
+replaced — AuthHex now owns credentials and signing; this app only holds AuthHex's **public** key
+to validate tokens, and never sees a plaintext password for this flow.
+
+Authorization is untouched: permission policies, role levels, scope checks, and the seeded role
+set all still work exactly as before, because every validated token is mapped back onto a local
+`User`/`Role` row before any authorization check runs.
+
+---
+
+## Configuration Changes
+
+```jsonc
+"Jwt": {
+  "PublicKey": "<RSAKeyValue>...</RSAKeyValue>",
+  "Audience": "AuthHexClient",
+  "Issuer": "AuthHex"
+},
+"AuthHex": { "BaseUrl": "http://localhost:6102" }
+```
+
+`Jwt:Key` (old symmetric secret) is removed. `Jwt:PublicKey` is AuthHex's RSA public key in XML
+format (not PEM).
+
+---
+
+## API Endpoints
+
+| Method | Route | Notes |
+|---|---|---|
+| POST | /api/auth/login | Proxies to AuthHex `loginUser` |
+| POST | /api/auth/register | Proxies to AuthHex `registerUser` |
+| GET | /api/auth/me | `[Authorize]`, proxies to AuthHex `getUserDetails` |
+| POST | /api/auth/logout | `[Authorize]`, proxies to AuthHex `LogoutUser` |
+
+All four just forward to `POST {AuthHex:BaseUrl}/api/user` and pass AuthHex's response back
+as-is. No cookie — token returned in the response body, sent back as `Authorization: Bearer`.
+
+---
+
+## Business Rules
+
+1. No local password check or token issuance — both delegated to AuthHex.
+2. `AddJwtBearer` validates issuer/audience/signature/lifetime against AuthHex's public key.
+3. `OnTokenValidated` maps the token's `sub` claim to a local `User` (`IUserRepository`); fails
+   the token if no matching active user exists.
+4. On success, `username`/`role_id`/`role_level` claims are attached from the **local** `User`/
+   `Role` row — authorization checks downstream are unaffected by anything AuthHex's own token
+   claims contain.
+5. Only one validation mechanism runs (`AddJwtBearer`) — two ported alternatives exist but are not
+   registered (see Implementation Notes).
+6. No refresh tokens — once the AuthHex-issued token expires, the client must log in again.
+
+---
+
+## Permissions to Add to Seed
+
+None — this only changes authentication. Permission policies and role seed data are untouched.
+
+---
+
+## Open Questions
+
+- Add a refresh-token flow if AuthHex doesn't offer one and re-login UX proves disruptive.
+- Keep or delete the ported `AuthMiddleware`/`JwtMiddleware` if never actually needed.
+- No retry/circuit-breaker if AuthHex is unreachable.
+
+---
+
+## Implementation Notes
+
+```
+Features/Auth/            — AuthController, AuthService, AuthDTOs (thin AuthHex proxies)
+Infra/Authorization/
+  AuthHex/                 — IAuthHexClient, AuthHexClient, AuthHexResponse
+  Jwt/RsaXmlKeyReader.cs    — portable XML→RSA key parser (RSA.FromXmlString is Windows-only)
+  Middleware/               — AuthMiddleware, JwtMiddleware, JwtOptions, ApiResponse
+                               (ported from OSMCore for reference — NOT registered)
+Program.cs                 — AddHttpClient<IAuthHexClient>, AddJwtBearer + OnTokenValidated
+                               (maps token → local User/Role → role_id/role_level claims)
+```
+
+**Gotcha:** don't run more than one of `AddJwtBearer` / `AuthMiddleware` /
+`JwtMiddleware.CustomMiddlewareAttribute` at once — each re-validates the same token
+independently.