Backend: Refactor API source structure

Signed-off-by: Michael Mayer <michael@liquidbytes.net>

internal/api/labels.go

@@ -1,13 +1,16 @@
 package api
 
 import (
+	"fmt"
 	"net/http"
+	"path"
 	"strconv"
 
 	"github.com/gin-gonic/gin"
 	"github.com/gin-gonic/gin/binding"
 	"github.com/photoprism/photoprism/internal/config"
 	"github.com/photoprism/photoprism/internal/form"
+	"github.com/photoprism/photoprism/internal/photoprism"
 	"github.com/photoprism/photoprism/internal/repo"
 	"github.com/photoprism/photoprism/internal/util"
 )
@@ -91,3 +94,62 @@ func DislikeLabel(router *gin.RouterGroup, conf *config.Config) {
 		c.JSON(http.StatusOK, http.Response{})
 	})
 }
+
+// GET /api/v1/labels/:slug/thumbnail/:type
+//
+// Example: /api/v1/labels/cheetah/thumbnail/tile_500
+//
+// Parameters:
+//   slug: string Label slug name
+//   type: string Thumbnail type, see photoprism.ThumbnailTypes
+func LabelThumbnail(router *gin.RouterGroup, conf *config.Config) {
+	router.GET("/labels/:slug/thumbnail/:type", func(c *gin.Context) {
+		typeName := c.Param("type")
+
+		thumbType, ok := photoprism.ThumbnailTypes[typeName]
+
+		if !ok {
+			log.Errorf("invalid type: %s", typeName)
+			c.Data(http.StatusBadRequest, "image/svg+xml", photoIconSvg)
+			return
+		}
+
+		r := repo.New(conf.OriginalsPath(), conf.Db())
+
+		// log.Infof("Searching for label slug: %s", c.Param("slug"))
+
+		file, err := r.FindLabelThumbBySlug(c.Param("slug"))
+
+		// log.Infof("Label thumb file: %#v", file)
+
+		if err != nil {
+			c.AbortWithStatusJSON(http.StatusNotFound, gin.H{"error": util.UcFirst(err.Error())})
+			return
+		}
+
+		fileName := path.Join(conf.OriginalsPath(), file.FileName)
+
+		if !util.Exists(fileName) {
+			log.Errorf("could not find original for thumbnail: %s", fileName)
+			c.Data(http.StatusNotFound, "image/svg+xml", photoIconSvg)
+
+			// Set missing flag so that the file doesn't show up in search results anymore
+			file.FileMissing = true
+			conf.Db().Save(&file)
+			return
+		}
+
+		if thumbnail, err := photoprism.ThumbnailFromFile(fileName, file.FileHash, conf.ThumbnailsPath(), thumbType.Width, thumbType.Height, thumbType.Options...); err == nil {
+			if c.Query("download") != "" {
+				downloadFileName := file.DownloadFileName()
+
+				c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=%s", downloadFileName))
+			}
+
+			c.File(thumbnail)
+		} else {
+			log.Errorf("could not create thumbnail: %s", err)
+			c.Data(http.StatusBadRequest, "image/svg+xml", photoIconSvg)
+		}
+	})
+}