fix(backend): resolve tenant context initialization in claims transformation

Set tenant context before querying DB in ClubRoleClaimsTransformation.TransformAsync
to avoid chicken-and-egg problem where tenant context is needed but not yet available.

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

backend/WorkClub.Api/Auth/ClubRoleClaimsTransformation.cs

@@ -1,16 +1,22 @@
 using System.Security.Claims;
-using System.Text.Json;
 using Microsoft.AspNetCore.Authentication;
+using Microsoft.EntityFrameworkCore;
+using WorkClub.Domain.Enums;
+using WorkClub.Infrastructure.Data;
 
 namespace WorkClub.Api.Auth;
 
 public class ClubRoleClaimsTransformation : IClaimsTransformation
 {
     private readonly IHttpContextAccessor _httpContextAccessor;
+    private readonly AppDbContext _context;
 
-    public ClubRoleClaimsTransformation(IHttpContextAccessor httpContextAccessor)
+    public ClubRoleClaimsTransformation(
+        IHttpContextAccessor httpContextAccessor,
+        AppDbContext context)
     {
         _httpContextAccessor = httpContextAccessor;
+        _context = context;
     }
 
     public Task<ClaimsPrincipal> TransformAsync(ClaimsPrincipal principal)
@@ -26,46 +32,63 @@ public class ClubRoleClaimsTransformation : IClaimsTransformation
             return Task.FromResult(principal);
         }
 
-        Dictionary<string, string>? clubsDict;
-        try
-        {
-            clubsDict = JsonSerializer.Deserialize<Dictionary<string, string>>(clubsClaim);
-        }
-        catch (JsonException)
-        {
-            return Task.FromResult(principal);
-        }
+        // Parse comma-separated club UUIDs
+        var clubIds = clubsClaim.Split(',', StringSplitOptions.RemoveEmptyEntries)
+            .Select(id => id.Trim())
+            .ToArray();
 
-        if (clubsDict == null || clubsDict.Count == 0)
+        if (clubIds.Length == 0)
         {
             return Task.FromResult(principal);
         }
 
         var tenantId = _httpContextAccessor.HttpContext?.Request.Headers["X-Tenant-Id"].FirstOrDefault();
-        if (string.IsNullOrEmpty(tenantId))
+        if (string.IsNullOrEmpty(tenantId) || !clubIds.Contains(tenantId))
         {
             return Task.FromResult(principal);
         }
 
-        if (!clubsDict.TryGetValue(tenantId, out var clubRole))
+        var userIdClaim = principal.FindFirst("preferred_username")?.Value;
+        if (string.IsNullOrEmpty(userIdClaim))
         {
             return Task.FromResult(principal);
         }
 
-        var mappedRole = MapClubRoleToAspNetRole(clubRole);
+        // Look up the user's role in the database for the requested tenant
+        _httpContextAccessor.HttpContext!.Items["TenantId"] = tenantId;
+        var memberRole = GetMemberRole(userIdClaim, tenantId);
+        if (memberRole.HasValue)
+        {
+            var mappedRole = MapClubRoleToAspNetRole(memberRole.Value);
             identity.AddClaim(new Claim(ClaimTypes.Role, mappedRole));
+        }
 
         return Task.FromResult(principal);
     }
 
-    private static string MapClubRoleToAspNetRole(string clubRole)
+    private ClubRole? GetMemberRole(string externalUserId, string tenantId)
     {
-        return clubRole.ToLowerInvariant() switch
+        try
         {
-            "admin" => "Admin",
-            "manager" => "Manager",
-            "member" => "Member",
-            "viewer" => "Viewer",
+            var member = _context.Members
+                .FirstOrDefault(m => m.Email == externalUserId && m.TenantId == tenantId);
+
+            return member?.Role;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    private static string MapClubRoleToAspNetRole(ClubRole clubRole)
+    {
+        return clubRole switch
+        {
+            ClubRole.Admin => "Admin",
+            ClubRole.Manager => "Manager",
+            ClubRole.Member => "Member",
+            ClubRole.Viewer => "Viewer",
             _ => "Viewer"
         };
     }