Added ldap and pam authentication

internal/access/scope.go

@@ -0,0 +1,55 @@
+package access
+
+import (
+	"slices"
+	"strings"
+)
+
+// Visibility scope tokens shared by user-owned, filterable objects across uopi
+// (config sets/instances, control-logic graphs, synthetic signals). They drive
+// the per-tree "Mine / Group / Global" selector. Storage carries the scope as a
+// plain string so each subsystem can embed it in its own JSON without depending
+// on this package's types.
+const (
+	// ScopePrivate: visible only to the owner.
+	ScopePrivate = "private"
+	// ScopeGroup: visible to the owner and members of any listed group.
+	ScopeGroup = "group"
+	// ScopeGlobal: visible to everyone. This is also the legacy default — an
+	// empty/unknown scope is treated as global so objects created before scopes
+	// existed stay visible to all.
+	ScopeGlobal = "global"
+)
+
+// CanSee reports whether user (a member of userGroups) may see an object with the
+// given owner, scope and itemGroups. An empty or unrecognised scope is treated as
+// global, so legacy objects without a scope remain visible to everyone.
+//
+// This is a visibility filter for selector trees, not a hard security boundary:
+// it governs which objects are offered in listings, and intentionally always
+// shows an object to its owner regardless of scope.
+func CanSee(user, owner, scope string, itemGroups, userGroups []string) bool {
+	switch strings.ToLower(strings.TrimSpace(scope)) {
+	case ScopePrivate:
+		return owner != "" && owner == user
+	case ScopeGroup:
+		if owner != "" && owner == user {
+			return true
+		}
+		for _, g := range itemGroups {
+			if slices.Contains(userGroups, g) {
+				return true
+			}
+		}
+		return false
+	default: // global / empty / unknown
+		return true
+	}
+}
+
+// CanSee reports whether user may see an object with the given owner, scope and
+// itemGroups, resolving the user's group memberships from the policy. It is the
+// convenience wrapper list handlers use.
+func (p *Policy) CanSee(user, owner, scope string, itemGroups []string) bool {
+	return CanSee(user, owner, scope, itemGroups, p.GroupsOf(user))
+}