add permissions route

internal/app/server.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"evening_detective_server/internal/modules/processor_jwt"
 	"evening_detective_server/internal/modules/roles"
+	"evening_detective_server/internal/services/ui_service"
 	"evening_detective_server/internal/services/users_service"
 	proto "evening_detective_server/proto"
 
@@ -15,13 +16,16 @@ type server struct {
 	proto.UnsafeEveningDetectiveServerServer
 
 	usersService *users_service.UsersService
+	uiService    *ui_service.UiService
 }
 
 func NewServer(
 	usersService *users_service.UsersService,
+	uiService *ui_service.UiService,
 ) proto.EveningDetectiveServerServer {
 	return &server{
 		usersService: usersService,
+		uiService:    uiService,
 	}
 }
 
@@ -152,3 +156,14 @@ func (s *server) DeleteUserRole(ctx context.Context, req *proto.DeleteUserRoleRe
 	}
 	return &proto.DeleteUserRoleRsp{}, nil
 }
+
+func (s *server) GetPermissions(
+	ctx context.Context,
+	req *proto.GetPermissionsReq,
+) (*proto.GetPermissionsRsp, error) {
+	claims := ctx.Value("claims").(*processor_jwt.JWTClaims)
+	permissions := s.uiService.GetPermissions(claims.Roles)
+	return &proto.GetPermissionsRsp{
+		Permissions: permissions,
+	}, nil
+}

internal/services/ui_service/service.go

@@ -0,0 +1,61 @@
+package ui_service
+
+import (
+	rolesModule "evening_detective_server/internal/modules/roles"
+	"slices"
+)
+
+var (
+	permissions = map[string][]string{
+		rolesModule.Admin: {
+			"users_page",
+		},
+		rolesModule.Author: {
+			"scenarios_page",
+			"scenario_editor_page",
+		},
+		rolesModule.Organizer: {
+			"scenarios_page",
+			"games_page",
+			"game_panel_page",
+		},
+		rolesModule.User: {
+			"games_page",
+		},
+	}
+)
+
+type UiService struct{}
+
+func NewUiService() *UiService {
+	return &UiService{}
+}
+
+func (s *UiService) GetPermissions(roles []string) []string {
+	resMap := s.getPermissionsMap(roles)
+	res := make([]string, 0, len(resMap))
+	for permission := range resMap {
+		res = append(res, permission)
+	}
+	return res
+}
+
+func (s *UiService) getPermissionsMap(roles []string) map[string]any {
+	resMap := make(map[string]any, 100)
+
+	if slices.Contains(roles, rolesModule.Admin) {
+		for _, permissionsList := range permissions {
+			for _, permission := range permissionsList {
+				resMap[permission] = struct{}{}
+			}
+		}
+		return resMap
+	}
+
+	for _, role := range roles {
+		for _, permission := range permissions[role] {
+			resMap[permission] = struct{}{}
+		}
+	}
+	return resMap
+}