feat: add port-sharing backend (#11939)

enterprise/coderd/portsharing/portsharing.go

@@ -0,0 +1,40 @@
+package portsharing
+
+import (
+	"golang.org/x/xerrors"
+
+	"github.com/coder/coder/v2/coderd/database"
+	"github.com/coder/coder/v2/codersdk"
+)
+
+type EnterprisePortSharer struct{}
+
+func NewEnterprisePortSharer() *EnterprisePortSharer {
+	return &EnterprisePortSharer{}
+}
+
+func (EnterprisePortSharer) AuthorizedPortSharingLevel(template database.Template, level codersdk.WorkspaceAgentPortShareLevel) error {
+	max := codersdk.WorkspaceAgentPortShareLevel(template.MaxPortSharingLevel)
+	switch level {
+	case codersdk.WorkspaceAgentPortShareLevelPublic:
+		if max != codersdk.WorkspaceAgentPortShareLevelPublic {
+			return xerrors.Errorf("port sharing level not allowed. Max level is '%s'", max)
+		}
+	case codersdk.WorkspaceAgentPortShareLevelAuthenticated:
+		if max == codersdk.WorkspaceAgentPortShareLevelOwner {
+			return xerrors.Errorf("port sharing level not allowed. Max level is '%s'", max)
+		}
+	default:
+		return xerrors.New("port sharing level is invalid.")
+	}
+
+	return nil
+}
+
+func (EnterprisePortSharer) ValidateTemplateMaxPortSharingLevel(level codersdk.WorkspaceAgentPortShareLevel) error {
+	if !level.ValidMaxLevel() {
+		return xerrors.New("invalid max port sharing level, value must be 'authenticated' or 'public'.")
+	}
+
+	return nil
+}