feat(backend): add optional features with an enabledFeatures setting

backend/internal/feature/module.go

@@ -0,0 +1,49 @@
+package feature
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+
+	"github.com/pocket-id/pocket-id/backend/internal/authz"
+	"github.com/pocket-id/pocket-id/backend/internal/httpserver"
+)
+
+type Dependencies struct {
+	DB        *gorm.DB
+	AppConfig appConfigStore
+}
+
+// Module reports which optional features are on, so the admin UI shows only their pages and tabs
+// Admins turn features on and off through the enabledFeatures application configuration value
+type Module struct {
+	service *Service
+}
+
+func New(deps Dependencies) *Module {
+	return &Module{service: &Service{db: deps.DB, appConfig: deps.AppConfig}}
+}
+
+// RegisterRoutes mounts the feature endpoints
+func (m *Module) RegisterRoutes(r *authz.Router) {
+	r.GET("/features", authz.ConfigRead, httpserver.Handle(m.list))
+}
+
+// list godoc
+// @Summary List optional features
+// @Description Get whether each optional feature is on and whether anything uses it; a feature in use is always on
+// @Tags Features
+// @Produce json
+// @Success 200 {object} map[string]feature.Status
+// @Failure default {object} dto.ErrorDto "Error"
+// @Router /api/features [get]
+func (m *Module) list(c *gin.Context) error {
+	statuses, err := m.service.List(c.Request.Context())
+	if err != nil {
+		return err
+	}
+
+	c.JSON(http.StatusOK, statuses)
+	return nil
+}