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package lib
// TODO: Remove this pending merge into github.com/emersion/go-message
import (
"bytes"
"encoding/binary"
"fmt"
"math/rand"
"os"
"time"
"github.com/martinlindhe/base36"
)
// Generates an RFC 2822-complaint Message-Id based on the informational draft
// "Recommendations for generating Message IDs", for lack of a better
// authoritative source.
func GenerateMessageId() string {
var (
now bytes.Buffer
nonce bytes.Buffer
)
binary.Write(&now, binary.BigEndian, time.Now().UnixNano())
binary.Write(&nonce, binary.BigEndian, rand.Uint64())
hostname, err := os.Hostname()
if err != nil {
hostname = "localhost"
}
return fmt.Sprintf("<%s.%s@%s>",
base36.EncodeBytes(now.Bytes()),
base36.EncodeBytes(nonce.Bytes()),
hostname)
}
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