feat(cloudreve): support thumbnail (close https://github.com/alist-org/alist/issues/5348)

drivers/cloudreve/driver.go

@@ -49,7 +49,11 @@ func (d *Cloudreve) List(ctx context.Context, dir model.Obj, args model.ListArgs
 	}
 
 	return utils.SliceConvert(r.Objects, func(src Object) (model.Obj, error) {
-		return objectToObj(src), nil
+		thumb, err := d.GetThumb(src)
+		if err != nil {
+			return nil, err
+		}
+		return objectToObj(src, thumb), nil
 	})
 }
 

drivers/cloudreve/types.go

@@ -44,13 +44,16 @@ type Object struct {
 	SourceEnabled bool      `json:"source_enabled"`
 }
 
-func objectToObj(f Object) *model.Object {
-	return &model.Object{
-		ID:       f.Id,
-		Name:     f.Name,
-		Size:     int64(f.Size),
-		Modified: f.Date,
-		IsFolder: f.Type == "dir",
+func objectToObj(f Object, t model.Thumbnail) *model.ObjThumb {
+	return &model.ObjThumb{
+		Object: model.Object{
+			ID:       f.Id,
+			Name:     f.Name,
+			Size:     int64(f.Size),
+			Modified: f.Date,
+			IsFolder: f.Type == "dir",
+		},
+		Thumbnail: t,
 	}
 }
 

drivers/cloudreve/util.go

@@ -149,3 +149,23 @@ func convertSrc(obj model.Obj) map[string]interface{} {
 	m["items"] = items
 	return m
 }
+
+func (d *Cloudreve) GetThumb(file Object) (model.Thumbnail, error) {
+	ua := d.CustomUA
+	if ua == "" {
+		ua = base.UserAgent
+	}
+	req := base.NoRedirectClient.R()
+	req.SetHeaders(map[string]string{
+		"Cookie":     "cloudreve-session=" + d.Cookie,
+		"Accept":     "image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
+		"User-Agent": ua,
+	})
+	resp, err := req.Execute(http.MethodGet, d.Address+"/api/v3/file/thumb/"+file.Id)
+	if err != nil {
+		return model.Thumbnail{}, err
+	}
+	return model.Thumbnail{
+		Thumbnail: resp.Header().Get("Location"),
+	}, nil
+}