databag/net/server/internal/api_getChannelTopicAssets.go

package databag

import (
	"databag/internal/store"
	"errors"
	"github.com/gorilla/mux"
	"gorm.io/gorm"
	"net/http"
)

func GetChannelTopicAssets(w http.ResponseWriter, r *http.Request) {

	// scan parameters
	params := mux.Vars(r)
	topicID := params["topicID"]

	channelSlot, guid, err, code := getChannelSlot(r, true)
	if err != nil {
		ErrResponse(w, code, err)
		return
	}

	// load topic
	var topicSlot store.TopicSlot
	if err = store.DB.Preload("Topic.Assets").Where("channel_id = ? AND topic_slot_id = ?", channelSlot.Channel.ID, topicID).First(&topicSlot).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			ErrResponse(w, http.StatusNotFound, err)
		} else {
			ErrResponse(w, http.StatusInternalServerError, err)
		}
		return
	}
	if topicSlot.Topic == nil {
		ErrResponse(w, http.StatusNotFound, errors.New("referenced empty topic"))
		return
	}

	// only creator can list assets
	if topicSlot.Topic.GUID != guid {
		ErrResponse(w, http.StatusUnauthorized, errors.New("permission denied to asset list"))
		return
	}

	// return list of assets
	assets := []Asset{}
	for _, asset := range topicSlot.Topic.Assets {
		assets = append(assets, Asset{AssetID: asset.AssetID, Status: asset.Status})
	}
	WriteResponse(w, &assets)
}