Function handleViewCollection

collections.go:857–1005

handleViewCollection displays the requested Collection

(app *App, w http.ResponseWriter, r *http.Request)

// handleViewCollection displays the requested Collection
func handleViewCollection(app *App, w http.ResponseWriter, r *http.Request) error {
	vars := mux.Vars(r)
	cr := &collectionReq{}

	err := processCollectionRequest(cr, vars, w, r)
	if err != nil {
		return err
	}

	u, err := checkUserForCollection(app, cr, r, false)
	if err != nil {
		return err
	}

	page := getCollectionPage(vars)

	c, err := processCollectionPermissions(app, cr, u, w, r)
	if c == nil || err != nil {
		return err
	}
	c.hostName = app.cfg.App.Host

	silenced, err := app.db.IsUserSilenced(c.OwnerID)
	if err != nil {
		log.Error("view collection: %v", err)
		return ErrInternalGeneral
	}

	// Serve ActivityStreams data now, if requested
	if IsActivityPubRequest(r) {
		ac := c.PersonObject()
		setCacheControl(w, apCacheTime)
		return impart.RenderActivityJSON(w, ac, http.StatusOK)
	}

	// Fetch extra data about the Collection
	// TODO: refactor out this logic, shared in collection.go:fetchCollection()
	coll, err := newDisplayCollection(c, cr, page)
	if err != nil {
		return err
	}

	var ct PostType
	if isArchiveView(r) {
		ct = postArch
	}

	// FIXME: this number will be off when user has pinned posts but isn't a Pro user
	ppp := coll.Format.PostsPerPage()
	if ct == postArch {
		ppp = postsPerArchPage
	}

	coll.TotalPages = int(math.Ceil(float64(coll.TotalPosts) / float64(ppp)))
	if coll.TotalPages > 0 && page > coll.TotalPages {
		redirURL := fmt.Sprintf("/page/%d", coll.TotalPages)
		if !app.cfg.App.SingleUser {
			redirURL = fmt.Sprintf("/%s%s%s", cr.prefix, coll.Alias, redirURL)