invite: add /count/used route

counts the number of active invites which have been used.

api-invites.go

@@ -275,6 +275,30 @@ func (app *appContext) GetInviteCount(gc *gin.Context) {
 	gc.JSON(200, resp)
 }
 
+// @Summary Get the number of invites stored in the database that have been used (but are still valid).
+// @Produce json
+// @Success 200 {object} PageCountDTO
+// @Router /invites/count [get]
+// @Security Bearer
+// @tags Invites
+func (app *appContext) GetInviteUsedCount(gc *gin.Context) {
+	resp := PageCountDTO{}
+	var err error
+	resp.Count, err = app.storage.db.Count(&Invite{}, badgerhold.Where("usedBy").MatchFunc(func(ra *badgerhold.RecordAccess) (bool, error) {
+		field := ra.Field()
+		switch usedBy := field.(type) {
+		case [][]string:
+			return len(usedBy) > 0, nil
+		default:
+			return false, nil
+		}
+	}))
+	if err != nil {
+		resp.Count = 0
+	}
+	gc.JSON(200, resp)
+}
+
 // @Summary Get invites.
 // @Produce json
 // @Success 200 {object} getInvitesDTO

router.go

@@ -201,6 +201,7 @@ func (app *appContext) loadRoutes(router *gin.Engine) {
 		api.POST(p+"/invites", app.GenerateInvite)
 		api.GET(p+"/invites", app.GetInvites)
 		api.GET(p+"/invites/count", app.GetInviteCount)
+		api.GET(p+"/invites/count/used", app.GetInviteUsedCount)
 		api.DELETE(p+"/invites", app.DeleteInvite)
 		api.POST(p+"/invites/profile", app.SetProfile)
 		api.GET(p+"/profiles", app.GetProfiles)