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package main
import (
"errors"
"flag"
"fmt"
"io"
"mime"
"mime/multipart"
"net/mail"
"os"
"strings"
)
func main() {
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "Usage: mimeslicer <command> [options]\n\n")
fmt.Fprintf(flag.CommandLine.Output(), "Commands:\n")
os.Exit(0)
}
if len(os.Args) < 2 {
fmt.Println("Error: Command missing.")
flag.Usage()
}
inspectCmd := flag.NewFlagSet("inspect", flag.ExitOnError)
inspectCmdInputFile := inspectCmd.String("i", "", "input file")
switch os.Args[1] {
case "inspect":
inspectCmd.Parse(os.Args[2:])
if err := inspect(*inspectCmdInputFile); err != nil {
fmt.Printf("Error: %s", err.Error())
os.Exit(1)
}
case "-h", "--help", "help":
flag.Usage()
default:
fmt.Printf("Error: unknown command %q\n\n", os.Args[1])
flag.Usage()
}
}
func inspect(file string) error {
fd, err := os.Open(file)
if err != nil {
return err
}
defer fd.Close()
msg, err := mail.ReadMessage(fd)
if err != nil {
return err
}
for k, v := range msg.Header {
for _, val := range v {
fmt.Printf("%s: %s\n", k, val)
}
}
contentType := msg.Header.Get("Content-Type")
mediaType, params, err := mime.ParseMediaType(contentType)
if err != nil {
return errors.Join(err, errors.New("failed to parse mediate type from contentType"))
}
if !strings.HasPrefix(mediaType, "multipart/") {
return errors.New("expected multipler/ TOOD")
}
boundary, ok := params["boundary"]
if !ok {
return errors.New("Error: no boundary in Content-Type header for multipart media type")
}
mr := multipart.NewReader(msg.Body, boundary)
partIndex := 0
fmt.Printf("\nMIME body parts\n\n")
for {
part, err := mr.NextPart()
if err == io.EOF {
break
}
fmt.Printf("[%d]\n", partIndex)
fmt.Printf("Headers:\n")
for k, v := range part.Header {
for _, val := range v {
fmt.Printf(" %s: %s\n", k, val)
}
}
partIndex++
}
return nil
}
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