feat(gallery): image detail view

internal/handlers/restgallery/controller.go

@@ -5,6 +5,7 @@ import (
 	"log/slog"
 	"net/http"
 
+	"git.schreifuchs.ch/schreifuchs/schreifuchs.ch/internal/handlers/rest"
 	"git.schreifuchs.ch/schreifuchs/schreifuchs.ch/internal/pkg/templer"
 	"git.schreifuchs.ch/schreifuchs/schreifuchs.ch/web/pages"
 )
@@ -14,8 +15,8 @@ const preloadCount = 6
 func (h *Handler) gallery(w http.ResponseWriter, r *http.Request) {
 	imgs, err := h.srv.GetGallerySet(r.Context())
 	if err != nil {
-		slog.Error("could not get images", "err", err)
-		w.WriteHeader(http.StatusInternalServerError)
+		slog.Error("could not get gallery set", "err", err)
+		rest.SendErr(w, err)
 		return
 	}
 	ctx := r.Context()
@@ -23,9 +24,22 @@ func (h *Handler) gallery(w http.ResponseWriter, r *http.Request) {
 		if i > preloadCount {
 			break
 		}
-		slog.Info("preloading images", "img", image.UID)
-		ctx = templer.AppendHeader(ctx, fmt.Sprintf(`<link rel="preload" href="%s" as="image" />`, image.URL()))
+		ctx = templer.AppendHeader(ctx, fmt.Sprintf(`<link rel="preload" href="%s?w=800" as="image" />`, image.URL()))
 	}
 
 	h.r.Render(ctx, w, r, pages.GallerySet(imgs))
 }
+
+func (h *Handler) image(w http.ResponseWriter, r *http.Request) {
+	uid := r.PathValue("image_uid")
+
+	slog.Debug("image from gallery", "uid", uid)
+	prev, next, err := h.srv.GetPrevAndNext(r.Context(), uid)
+	if err != nil {
+		slog.Error("could not get gallery", "err", err)
+		rest.SendErr(w, err)
+		return
+	}
+
+	h.r.Render(r.Context(), w, r, pages.GalleryImage(uid, next, prev))
+}

internal/handlers/restgallery/resource.go

@@ -28,12 +28,16 @@ func New(renderer renderer, srv galleryService, cfg *config.Gallery) *Handler {
 		cfg:     cfg,
 	}
 
-	mux.HandleFunc(fmt.Sprintf("GET /%s", url.PathEscape(cfg.Path)), h.gallery)
+	galleryPath := url.PathEscape(cfg.Path)
+
+	mux.HandleFunc(fmt.Sprintf("GET /%s/{image_uid}", galleryPath), h.image)
+	mux.HandleFunc(fmt.Sprintf("GET /%s", galleryPath), h.gallery)
 	return h
 }
 
 type galleryService interface {
 	GetGallerySet(ctx context.Context) (gallerySet gallery.Set, err error)
+	GetPrevAndNext(ctx context.Context, uid string) (previous *gallery.Image, next *gallery.Image, err error)
 }
 type renderer interface {
 	Render(ctx context.Context, w io.Writer, r *http.Request, component templ.Component)