feat(crypt): optional pre-generated thumbnails (#5284)

drivers/crypt/driver.go

@@ -16,6 +16,7 @@ import (
 	"github.com/alist-org/alist/v3/internal/op"
 	"github.com/alist-org/alist/v3/pkg/http_range"
 	"github.com/alist-org/alist/v3/pkg/utils"
+	"github.com/alist-org/alist/v3/server/common"
 	rcCrypt "github.com/rclone/rclone/backend/crypt"
 	"github.com/rclone/rclone/fs/config/configmap"
 	"github.com/rclone/rclone/fs/config/obscure"
@@ -152,7 +153,10 @@ func (d *Crypt) List(ctx context.Context, dir model.Obj, args model.ListArgs) ([
 				Ctime:    obj.CreateTime(),
 				// discarding hash as it's encrypted
 			}
-			if !ok {
+			if d.Thumbnail && thumb == "" {
+				thumb = utils.EncodePath(common.GetApiUrl(nil) + stdpath.Join("/d", args.ReqPath, ".thumbnails", name+".webp"), true)
+			}
+			if !ok && !d.Thumbnail {
 				result = append(result, &objRes)
 			} else {
 				objWithThumb := model.ObjThumb{

drivers/crypt/meta.go

@@ -19,6 +19,8 @@ type Addition struct {
 	Salt             string `json:"salt" confidential:"true"  help:"If you don't know what is salt, treat it as a second password. Optional but recommended"`
 	EncryptedSuffix  string `json:"encrypted_suffix" required:"true" default:".bin" help:"for advanced user only! encrypted files will have this suffix"`
 	FileNameEncoding string `json:"filename_encoding" type:"select" required:"true" options:"base64,base32,base32768" default:"base64" help:"for advanced user only!"`
+
+	Thumbnail   bool   `json:"thumbnail" required:"true" default:"false" help:"enable thumbnail which pre-generated under .thumbnails folder"`
 }
 
 var config = driver.Config{