Parse cloudmailin emails

mailparser.go

package mailparser

import (
	"bytes"
	"fmt"
	"io"
	"log"
	"mime/multipart"
	"net/http"
)

const Boundary = "----cloudmailinboundry"

func LogMail(w http.ResponseWriter, req *http.Request) {
	r := multipart.NewReader(req.Body, Boundary)
	for i := 0; ; i++ {
		part, err := r.NextPart()
		if err == io.EOF {
			w.WriteHeader(204)
			return
		}
		if err != nil {
			log.Println(err)
			w.WriteHeader(500)
			return
		}
		var b bytes.Buffer
		fmt.Fprintf(&b, "Part %d (%v)", i, part.FormName())
		if fn := part.FileName(); fn != "" {
			fmt.Fprintf(&b, " filename %q", fn)
		}
		fmt.Fprintf(&b, "\n\n")
		io.Copy(&b, part)
		log.Println(b.String())
	}
}