Sharing: Use single image as preview for small albums #18

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

internal/api/share_preview.go

@@ -69,13 +69,13 @@ func SharePreview(router *gin.RouterGroup) {
 		f.Hidden = false
 		f.Archived = false
 		f.Review = false
-		f.Merged = true
+		f.Primary = true
 
 		// Get first 12 album entries.
 		f.Count = 12
 		f.Order = "relevance"
 
-		p, _, err := query.PhotoSearch(f)
+		p, count, err := query.PhotoSearch(f)
 
 		if err != nil {
 			log.Error(err)
@@ -83,6 +83,34 @@ func SharePreview(router *gin.RouterGroup) {
 			return
 		}
 
+		if count == 0 {
+			c.Redirect(http.StatusTemporaryRedirect, conf.SitePreview())
+			return
+		} else if count < 12 {
+			f := p[0]
+			thumbType, _ := thumb.Types["fit_720"]
+
+			fileName := photoprism.FileName(f.FileRoot, f.FileName)
+
+			if !fs.FileExists(fileName) {
+				log.Errorf("share: file %s is missing (preview)", txt.Quote(f.FileName))
+				c.Redirect(http.StatusTemporaryRedirect, conf.SitePreview())
+				return
+			}
+
+			thumbnail, err := thumb.FromFile(fileName, f.FileHash, conf.ThumbPath(), thumbType.Width, thumbType.Height, thumbType.Options...)
+
+			if err != nil {
+				log.Error(err)
+				c.Redirect(http.StatusTemporaryRedirect, conf.SitePreview())
+				return
+			}
+
+			c.File(thumbnail)
+
+			return
+		}
+
 		width := 908
 		height := 680
 		x := 0
@@ -105,6 +133,7 @@ func SharePreview(router *gin.RouterGroup) {
 			if err != nil {
 				log.Error(err)
 				c.Redirect(http.StatusTemporaryRedirect, conf.SitePreview())
+				return
 			}
 
 			src, err := imaging.Open(thumbnail)

internal/form/photo_search.go

@@ -16,6 +16,7 @@ type PhotoSearch struct {
 	Original  string    `form:"original"`
 	Title     string    `form:"title"`
 	Hash      string    `form:"hash"`
+	Primary   bool      `form:"primary"`
 	Video     bool      `form:"video"`
 	Photo     bool      `form:"photo"`
 	Duplicate bool      `form:"duplicate"`

internal/query/photo_search.go

@@ -49,6 +49,11 @@ func PhotoSearch(f form.PhotoSearch) (results PhotoResults, count int, err error
 		}
 	}
 
+	// Return primary files only.
+	if f.Primary {
+		s = s.Where("files.file_primary = 1")
+	}
+
 	// Shortcut for known photo ids.
 	if f.ID != "" {
 		s = s.Where("photos.photo_uid IN (?)", strings.Split(f.ID, ","))