feat: modularize the code.

files.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"github.com/labstack/echo/v4"
+	"log"
+	"net/http"
+	"os"
+	"regexp"
+)
+
+type File struct {
+	Name     string
+	FileType string
+	Content  string
+}
+
+type FilesData struct {
+	Files []File
+}
+
+func Files(c echo.Context) error {
+	var files FilesData
+
+	filelist, err := os.ReadDir("./files/")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	UserAgent := c.Request().UserAgent()
+
+	log.Print(UserAgent)
+
+	match, err := regexp.MatchString("^curl/.*", UserAgent)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if match {
+		out := ""
+		for _, f := range filelist {
+			out += f.Name() + "\n"
+		}
+		return c.String(http.StatusOK, out)
+	}
+
+	var Type string
+	var Content string
+
+	ImageMatch := regexp.MustCompile("^image/.*")
+	VideoMatch := regexp.MustCompile("^video/.*")
+	JsonMatch := regexp.MustCompile("application/json")
+	TextMatch := regexp.MustCompile("^text/.*")
+
+	for _, f := range filelist {
+		filePath := "files/" + f.Name()
+		file, err := os.Open(filePath)
+		if err != nil {
+			panic(err)
+		}
+
+		defer file.Close()
+
+		contentType, err := GetFileContentType(file)
+
+		switch {
+		case ImageMatch.MatchString(contentType):
+			Type = "image"
+			Content = ""
+		case VideoMatch.MatchString(contentType):
+			Type = "video"
+			Content = ""
+		case JsonMatch.MatchString(contentType):
+			Type = "text"
+			b, _ := os.ReadFile(filePath)
+			Content = string(b)
+		case TextMatch.MatchString(contentType):
+			Type = "text"
+			b, _ := os.ReadFile(filePath)
+			Content = string(b)
+		default:
+			Type = "else"
+			Content = ""
+		}
+
+		log.Print(contentType)
+		files.Files = append(
+			files.Files,
+			File{Name: f.Name(), FileType: Type, Content: Content},
+		)
+	}
+
+	return c.Render(http.StatusOK, "files", files)
+}