Fix: cache-control header in thumb redirect request

pkg/filesystem/image.go

@@ -33,6 +33,9 @@ func (fs *FileSystem) GetThumb(ctx context.Context, id uint) (*response.ContentR
 	ctx = context.WithValue(ctx, fsctx.ThumbSizeCtx, [2]uint{w, h})
 	ctx = context.WithValue(ctx, fsctx.FileModelCtx, fs.FileTarget[0])
 	res, err := fs.Handler.Thumb(ctx, fs.FileTarget[0].SourceName)
+	if err == nil {
+		res.MaxAge = model.GetIntSetting("preview_timeout", 60)
+	}
 
 	// TODO 出错时重新生成缩略图
 	return res, err

pkg/filesystem/image_test.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"github.com/DATA-DOG/go-sqlmock"
 	model "github.com/HFO4/cloudreve/models"
+	"github.com/HFO4/cloudreve/pkg/cache"
 	"github.com/HFO4/cloudreve/pkg/conf"
 	"github.com/HFO4/cloudreve/pkg/filesystem/response"
 	"github.com/HFO4/cloudreve/pkg/util"
@@ -32,6 +33,7 @@ func CreateTestImage() *os.File {
 func TestFileSystem_GetThumb(t *testing.T) {
 	asserts := assert.New(t)
 	ctx := context.Background()
+	cache.Set("setting_preview_timeout", "60", 0)
 
 	// 正常
 	{

pkg/filesystem/response/common.go

@@ -9,6 +9,7 @@ type ContentResponse struct {
 	Redirect bool
 	Content  RSCloser
 	URL      string
+	MaxAge   int
 }
 
 // RSCloser 存储策略适配器返回的文件流，有些策略需要带有Closer

routers/controllers/file.go

@@ -3,6 +3,7 @@ package controllers
 import "C"
 import (
 	"context"
+	"fmt"
 	model "github.com/HFO4/cloudreve/models"
 	"github.com/HFO4/cloudreve/pkg/filesystem"
 	"github.com/HFO4/cloudreve/pkg/filesystem/driver/local"
@@ -126,6 +127,7 @@ func Thumb(c *gin.Context) {
 	}
 
 	if resp.Redirect {
+		c.Header("Cache-Control", fmt.Sprintf("max-age=%d", resp.MaxAge))
 		c.Redirect(http.StatusMovedPermanently, resp.URL)
 		return
 	}