Get File Information in Golang

package main

import (
    "fmt"
    "net/http"
    "os"
)

func GetFileContentType(file *os.File) (string, error) {
    buffer := make([]byte, 512)
    _, err := file.Read(buffer)
    if err != nil {
        return "", err
    }
    contentType := http.DetectContentType(buffer)
    return contentType, nil
}

func main() {

    file, err := os.Open("data.txt")
    if err != nil {
        fmt.Println(err)
    } else {
        stat, _ := file.Stat()
        fmt.Println("File Name: ", stat.Name())
        fmt.Println("File Size(bytes): ", stat.Size())
        fileType, _ := GetFileContentType(file)
        fmt.Println("File Type: ", fileType)
    }

}      
        

Output

File Name:  data.txt
File Size(bytes):  5
File Type:  application/octet-stream