feat: embed support send file function

docs/middlewares.md

@@ -708,6 +708,8 @@ func main() {
 package main
 
 import (
+	"time"
+
 	"github.com/vicanso/elton"
 	"github.com/vicanso/elton/middleware"
 )
@@ -720,9 +722,9 @@ func main() {
 	e.GET("/*", middleware.NewStaticServe(sf, middleware.StaticServeConfig{
 		Path: "/tmp",
 		// 客户端缓存一年
-		MaxAge: 365 * 24 * 3600,
+		MaxAge: 365 * 24 * time.Hour,
 		// 缓存服务器缓存一个小时
-		SMaxAge:             60 * 60,
+		SMaxAge:             time.Hour,
 		DenyQueryString:     true,
 		DisableLastModified: true,
 		// 如果使用packr，它不支持Stat，因此需要用强ETag
@@ -745,6 +747,7 @@ package main
 import (
 	"bytes"
 	"io"
+	"time"
 	"os"
 
 	packr "github.com/gobuffalo/packr/v2"
@@ -789,9 +792,9 @@ func main() {
 	// static file route
 	e.GET("/static/*", middleware.NewStaticServe(sf, middleware.StaticServeConfig{
 		// 客户端缓存一年
-		MaxAge: 365 * 24 * 3600,
+		MaxAge: 365 * 24 * time.Hour,
 		// 缓存服务器缓存一个小时
-		SMaxAge:             60 * 60,
+		SMaxAge:             time.Hour,
 		DenyQueryString:     true,
 		DisableLastModified: true,
 	}))

middleware/static_embed.go

@@ -28,6 +28,8 @@ import (
 	"io"
 	"os"
 	"path/filepath"
+
+	"github.com/vicanso/elton"
 )
 
 type embedStaticFS struct {
@@ -77,3 +79,16 @@ func (es *embedStaticFS) NewReader(file string) (io.Reader, error) {
 	}
 	return bytes.NewReader(buf), nil
 }
+
+// SendFile sends file to http response and set content type
+func (es *embedStaticFS) SendFile(c *elton.Context, file string) (err error) {
+	// 因为静态文件打包至程序中，直接读取
+	buf, err := es.Get(file)
+	if err != nil {
+		return
+	}
+	// 根据文件后续设置类型
+	c.SetContentTypeByExt(file)
+	c.BodyBuffer = bytes.NewBuffer(buf)
+	return
+}