feat: echo(get,set file)

service/echo/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.20.14-alpine3.19 AS builder
+FROM golang:latest AS builder
 
 WORKDIR /app/build
 
@@ -7,6 +7,8 @@ COPY go.sum .
 COPY service/echo/main.go .
 
 ENV GOPROXY https://goproxy.io
+ENV GOOS linux
+ENV GOARCH amd64
 
 RUN go mod download && go build -ldflags='-s -w' -o echo_app .
 

service/echo/main.go

@@ -3,7 +3,9 @@ package main
 import (
 	"flag"
 	"fmt"
+	"io"
 	"log"
+	"net/http"
 	"os"
 	"path"
 	"time"
@@ -37,6 +39,51 @@ func main() {
 		return c.Next()
 	})
 
+	app.Get("/echo/file", func(c *nf.Ctx) error {
+		type Req struct {
+			Filename string `query:"filename"`
+			Download bool   `query:"download"`
+		}
+
+		var (
+			err  error
+			req  = new(Req)
+			file *os.File
+			bs   []byte
+		)
+
+		if err = c.QueryParser(req); err != nil {
+			return resp.Resp400(c, err.Error())
+		}
+
+		if req.Filename == "" {
+			return resp.Resp400(c, req, "empty file name")
+		}
+
+		filename := path.Join(root, path.Base(req.Filename))
+
+		if file, err = os.Open(filename); err != nil {
+			return resp.Resp400(c, nf.Map{"filepath": filename, "err": err.Error()})
+		}
+
+		if bs, err = io.ReadAll(file); err != nil {
+			return resp.Resp400(c, nf.Map{"filepath": filename, "err": err.Error()})
+		}
+
+		ct := ""
+		if len(bs) > 512 {
+			ct = http.DetectContentType(bs[:512])
+		} else {
+			ct = http.DetectContentType(bs)
+		}
+
+		c.SetHeader("Content-Type", ct)
+
+		_, err = c.Write(bs)
+
+		return err
+	})
+
 	app.Post("/echo/file", func(c *nf.Ctx) error {
 		type Req struct {
 			Filename string