feat(dashboard): GroupToTag / UntaggedSessionVisibility config (SEC-25)

Groundwork for the per-session dashboard event ACL (docs/plans/2026-07-10-dashboard-session-acl-tst15.md 3.2): a dashboard group can now grant visibility tags, and untagged sessions default to AdminOnly. Enforcement lands with the EventsHub ACL; nothing consumes the grant yet. GroupToTag is deliberately uncoupled from GroupToRole - a group may appear in either map, both, or neither - and is validated for shape only. Tags gate dashboard event visibility, never data access.
2026-08-17 03:46:56 -04:00
parent fa9eb0c0b4
commit c79aaaf9eb
7 changed files with 389 additions and 1 deletions
@@ -0,0 +1,59 @@
+namespace ZB.MOM.WW.MxGateway.Server.Dashboard;
+
+/// <summary>
+/// Single source of truth for mapping a user's LDAP groups to the dashboard
+/// visibility tags they are granted (<c>MxGateway:Dashboard:GroupToTag</c>).
+/// Sibling of <see cref="DashboardGroupRoleMapping"/> and deliberately follows
+/// the same group-matching rules (full DN first, leading-RDN fallback,
+/// case-insensitive) so operators write one kind of group key for both maps.
+/// Tags gate dashboard event VISIBILITY only; they are never a data-access
+/// constraint.
+/// </summary>
+internal static class DashboardGroupTagMapping
+{
+    /// <summary>
+    /// Maps the user's LDAP groups to the union of the tags those groups grant.
+    /// A group with no entry in the map contributes nothing; duplicate tags
+    /// across groups collapse (case-insensitively). Returns an empty set when no
+    /// group matches — an empty grant, which the ACL treats as "sees no tagged
+    /// session".
+    /// </summary>
+    /// <param name="groups">The collection of LDAP groups the user belongs to.</param>
+    /// <param name="groupToTag">The mapping from group names to granted tags.</param>
+    /// <returns>The distinct tags granted across all of the user's groups.</returns>
+    internal static IReadOnlySet<string> MapGroupsToTags(
+        IEnumerable<string> groups,
+        IReadOnlyDictionary<string, string[]> groupToTag)
+    {
+        HashSet<string> tags = new(StringComparer.OrdinalIgnoreCase);
+        if (groupToTag.Count == 0)
+        {
+            return tags;
+        }
+
+        foreach (string group in groups)
+        {
+            string normalizedGroup = group.Trim();
+
+            if (!groupToTag.TryGetValue(normalizedGroup, out string[]? granted)
+                && !groupToTag.TryGetValue(
+                    DashboardGroupRoleMapping.ExtractFirstRdnValue(normalizedGroup),
+                    out granted))
+            {
+                continue;
+            }
+
+            if (granted is null)
+            {
+                continue;
+            }
+
+            foreach (string tag in granted)
+            {
+                tags.Add(tag);
+            }
+        }
+
+        return tags;
+    }
+}