implement thumbnail support for public shares

thumbnails/pkg/thumbnail/storage/filesystem.go

@@ -7,7 +7,6 @@ import (
 	"os"
 	"path/filepath"
 	"strconv"
-	"strings"
 )
 
 const (
@@ -67,20 +66,15 @@ func (s *FileSystem) Put(key string, img []byte) error {
 // BuildKey generate the unique key for a thumbnail.
 // The key is structure as follows:
 //
-// <first two letters of etag>/<next two letters of etag>/<rest of etag>/<width>x<height>.<filetype>
+// <first two letters of checksum>/<next two letters of checksum>/<rest of checksum>/<width>x<height>.<filetype>
 //
 // e.g. 97/9f/4c8db98f7b82e768ef478d3c8612/500x300.png
 //
 // The key also represents the path to the thumbnail in the filesystem under the configured root directory.
 func (s *FileSystem) BuildKey(r Request) string {
-	etag := r.ETag
+	checksum := r.Checksum
 	filetype := r.Types[0]
 	filename := strconv.Itoa(r.Resolution.Dx()) + "x" + strconv.Itoa(r.Resolution.Dy()) + "." + filetype
 
-	return filepath.Join(etag[:2], etag[2:4], etag[4:], filename)
-}
-
-func (s *FileSystem) rootDir(key string) string {
-	p := strings.Split(key, string(os.PathSeparator))
-	return p[0]
+	return filepath.Join(checksum[:2], checksum[2:4], checksum[4:], filename)
 }

thumbnails/pkg/thumbnail/storage/inmemory.go

@@ -31,7 +31,7 @@ func (s InMemory) Put(key string, thumbnail []byte) error {
 // BuildKey generates a unique key to store and retrieve the thumbnail.
 func (s InMemory) BuildKey(r Request) string {
 	parts := []string{
-		r.ETag,
+		r.Checksum,
 		r.Resolution.String(),
 		strings.Join(r.Types, ","),
 	}

thumbnails/pkg/thumbnail/storage/storage.go

@@ -6,7 +6,7 @@ import (
 
 // Request combines different attributes needed for storage operations.
 type Request struct {
-	ETag       string
+	Checksum   string
 	Types      []string
 	Resolution image.Rectangle
 }