Images section (#813)

* Add new configuration options
* Refactor scan/clean
* Schema changes
* Add details to galleries
* Remove redundant code
* Refine thumbnail generation
* Gallery overhaul
* Don't allow modifying zip gallery images
* Show gallery card overlays
* Hide zoom slider when not in grid mode

pkg/api/routes_image.go

@@ -0,0 +1,75 @@
+package api
+
+import (
+	"context"
+	"net/http"
+	"strconv"
+
+	"github.com/go-chi/chi"
+	"github.com/stashapp/stash/pkg/image"
+	"github.com/stashapp/stash/pkg/manager"
+	"github.com/stashapp/stash/pkg/models"
+	"github.com/stashapp/stash/pkg/utils"
+)
+
+type imageRoutes struct{}
+
+func (rs imageRoutes) Routes() chi.Router {
+	r := chi.NewRouter()
+
+	r.Route("/{imageId}", func(r chi.Router) {
+		r.Use(ImageCtx)
+
+		r.Get("/image", rs.Image)
+		r.Get("/thumbnail", rs.Thumbnail)
+	})
+
+	return r
+}
+
+// region Handlers
+
+func (rs imageRoutes) Thumbnail(w http.ResponseWriter, r *http.Request) {
+	image := r.Context().Value(imageKey).(*models.Image)
+	filepath := manager.GetInstance().Paths.Generated.GetThumbnailPath(image.Checksum, models.DefaultGthumbWidth)
+
+	// if the thumbnail doesn't exist, fall back to the original file
+	exists, _ := utils.FileExists(filepath)
+	if exists {
+		http.ServeFile(w, r, filepath)
+	} else {
+		rs.Image(w, r)
+	}
+}
+
+func (rs imageRoutes) Image(w http.ResponseWriter, r *http.Request) {
+	i := r.Context().Value(imageKey).(*models.Image)
+
+	// if image is in a zip file, we need to serve it specifically
+	image.Serve(w, r, i.Path)
+}
+
+// endregion
+
+func ImageCtx(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		imageIdentifierQueryParam := chi.URLParam(r, "imageId")
+		imageID, _ := strconv.Atoi(imageIdentifierQueryParam)
+
+		var image *models.Image
+		qb := models.NewImageQueryBuilder()
+		if imageID == 0 {
+			image, _ = qb.FindByChecksum(imageIdentifierQueryParam)
+		} else {
+			image, _ = qb.Find(imageID)
+		}
+
+		if image == nil {
+			http.Error(w, http.StatusText(404), 404)
+			return
+		}
+
+		ctx := context.WithValue(r.Context(), imageKey, image)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}