Feat: readme in shared folder

pkg/request/request.go

@@ -243,6 +243,9 @@ func (instance NopRSCloser) SetContentLength(size int64) {
 
 // Read 实现 NopRSCloser reader
 func (instance NopRSCloser) Read(p []byte) (n int, err error) {
+	if instance.status.IgnoreFirst && len(p) == 512 {
+		return 0, io.EOF
+	}
 	return instance.body.Read(p)
 }
 

routers/controllers/share.go

@@ -2,8 +2,13 @@ package controllers
 
 import (
 	"context"
+	model "github.com/HFO4/cloudreve/models"
+	"github.com/HFO4/cloudreve/pkg/serializer"
+	"github.com/HFO4/cloudreve/pkg/util"
 	"github.com/HFO4/cloudreve/service/share"
 	"github.com/gin-gonic/gin"
+	"path"
+	"strings"
 )
 
 // CreateShare 创建分享
@@ -80,6 +85,38 @@ func PreviewShareText(c *gin.Context) {
 	}
 }
 
+// PreviewShareReadme 预览文本自述文件
+func PreviewShareReadme(c *gin.Context) {
+	// 创建上下文
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	var service share.Service
+	if err := c.ShouldBindQuery(&service); err == nil {
+		// 自述文件名限制
+		allowFileName := []string{"readme.txt", "readme.md"}
+		fileName := strings.ToLower(path.Base(service.Path))
+		if !util.ContainsString(allowFileName, fileName) {
+			c.JSON(200, serializer.ParamErr("非README文件", nil))
+		}
+
+		// 必须是目录分享
+		if shareCtx, ok := c.Get("share"); ok {
+			if !shareCtx.(*model.Share).IsDir {
+				c.JSON(200, serializer.ParamErr("此分享无自述文件", nil))
+			}
+		}
+
+		res := service.PreviewContent(ctx, c, true)
+		// 是否有错误发生
+		if res.Code != 0 {
+			c.JSON(200, res)
+		}
+	} else {
+		c.JSON(200, ErrorResponse(err))
+	}
+}
+
 // GetShareDocPreview 创建分享Office文档预览地址
 func GetShareDocPreview(c *gin.Context) {
 	var service share.Service

routers/router.go

@@ -209,6 +209,11 @@ func InitMasterRouter() *gin.Engine {
 				middleware.BeforeShareDownload(),
 				controllers.ArchiveShare,
 			)
+			// 获取README文本文件内容
+			share.GET("readme/:id",
+				middleware.CheckShareUnlocked(),
+				controllers.PreviewShareReadme,
+			)
 		}
 
 		// 需要登录保护的

service/explorer/file.go

@@ -255,6 +255,10 @@ func (service *SingleFileService) PreviewContent(ctx context.Context, c *gin.Con
 	// 直接返回文件内容
 	defer resp.Content.Close()
 
+	if isText {
+		c.Header("Cache-Control", "no-cache")
+	}
+
 	http.ServeContent(c.Writer, c.Request, fs.FileTarget[0].Name, fs.FileTarget[0].UpdatedAt, resp.Content)
 
 	return serializer.Response{