Feat: get thumb & download file in qiniu policy

pkg/filesystem/image.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	model "github.com/HFO4/cloudreve/models"
 	"github.com/HFO4/cloudreve/pkg/conf"
+	"github.com/HFO4/cloudreve/pkg/filesystem/fsctx"
 	"github.com/HFO4/cloudreve/pkg/filesystem/response"
 	"github.com/HFO4/cloudreve/pkg/thumb"
 	"github.com/HFO4/cloudreve/pkg/util"
@@ -28,6 +29,8 @@ func (fs *FileSystem) GetThumb(ctx context.Context, id uint) (*response.ContentR
 		}, ErrObjectNotExist
 	}
 
+	w, h := fs.GenerateThumbnailSize(0, 0)
+	ctx = context.WithValue(ctx, fsctx.ThumbSizeCtx, [2]uint{w, h})
 	res, err := fs.Handler.Thumb(ctx, fs.FileTarget[0].SourceName)
 
 	// TODO 出错时重新生成缩略图