feat: modularize the code.

upload.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"github.com/labstack/echo/v4"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"regexp"
+)
+
+func Upload(c echo.Context) error {
+	file, err := c.FormFile("file")
+	if err != nil {
+		return err
+	}
+
+	if _, err := os.Stat("files/" + file.Filename); err == nil {
+		return c.String(http.StatusOK, "A file with the same name already exist's on the server.\n")
+	}
+
+	src, err := file.Open()
+	if err != nil {
+		return err
+	}
+
+	dst, err := os.Create("files/" + file.Filename)
+	if err != nil {
+		return err
+	}
+	defer dst.Close()
+
+	if _, err = io.Copy(dst, src); err != nil {
+		return err
+	}
+
+	fileUrl := domain + "/files/" + file.Filename + "\n"
+
+	UserAgent := c.Request().UserAgent()
+
+	log.Print(UserAgent)
+
+	match, err := regexp.MatchString("^curl/.*", UserAgent)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if match {
+		return c.String(http.StatusOK, fileUrl)
+	}
+
+	return c.HTML(http.StatusOK, "File uploaded at url: <strong>"+fileUrl+"</strong>")
+}