Help us understand the problem. What is going on with this article?

Golang で iso-2022-jp メールのデコード

More than 3 years have passed since last update.

メールの内容を解析したい場合、
net/mailパッケージだと、そのままでは日本語メールを読めないですよね。

github.com/curious-eyes/jmailパッケージを使ってみてはいかがでしょう。

$ go get github.com/curious-eyes/jmail

下記例のコードはutf-8ですが、iso-2022-jpの場合でも正しく出力されます。

package main

import (
    "fmt"
    mail "github.com/curious-eyes/jmail"
    "log"
    "strings"
)

func main() {
    msg := `Date: Wed, 16 Sep 2015 05:32:06 +0900
From: Gopher <from@example.com>
To: Another Gopher <to@example.com>
Subject: =?UTF-8?Q?=E7=94=9F=E6=B4=BB=E3=81=AE=E3=81=BB=E3=81=A8=E3=82=93=E3=81=A9=E3=82=92?=
 =?UTF-8?Q?=E5=9C=B0=E4=B8=AD=E3=81=A7=E9=81=8E=E3=81=94=E3=81=99?=
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

=E3=83=9B=E3=83=AA=E3=83=8D=E3=82=BA=E3=83=9F=20=28=E8=8B=B1=3A=20Gopher=
=29=E3=81=AF=E3=80=81=E5=93=BA=E4=B9=B3=E7=B6=B1=E3=83=8D=E3=82=BA=E3=83=
=9F=E7=9B=AE=EF=BC=88=E9=BD=A7=E6=AD=AF=E7=9B=AE=EF=BC=89=E3=83=8D=E3=82=
=BA=E3=83=9F=E4=BA=9C=E7=9B=AE=E3=83=9B=E3=83=AA=E3=83=8D=E3=82=BA=E3=83=
=9F=E7=A7=91=E3=81=AB=E5=B1=9E=E3=81=99=E3=82=8B=E5=93=BA=E4=B9=B3=E9=A1=
=9E=E3=81=AE=E7=B7=8F=E7=A7=B0
`

    r := strings.NewReader(msg)
    m, err := mail.ReadMessage(r)
    if err != nil {
        log.Fatal(err)
    }

    header := m.Header
    fmt.Println("Date:", header.Get("Date"))
    fmt.Println("From:", header.Get("From"))
    fmt.Println("To:", header.Get("To"))

    fmt.Println("Subject:", m.DecSubject())
    body, err := m.DecBody()
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("%s", body)

    // Output:
    // Date: Wed, 16 Sep 2015 05:32:06 +0900
    // From: Gopher <from@example.com>
    // To: Another Gopher <to@example.com>
    // Subject: 生活のほとんどを地中で過ごす
    // ホリネズミ (英: Gopher)は、哺乳綱ネズミ目(齧歯目)ネズミ亜目ホリネズミ科に属する哺乳類の総称
}

net/mailパッケージの構造体を埋め込んで実装しているので、同じように使えます。
Subject(件名)と Body(本文)をデコードしたい場合だけ、
- DecSubject
- DecBody
を使ってください。

From, To アドレスリストもデコードできればいいですね。
今どきメールを扱うことなんて、無いかもしれませんけどね。

Why do not you register as a user and use Qiita more conveniently?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
Comments
Sign up for free and join this conversation.
If you already have a Qiita account
Why do not you register as a user and use Qiita more conveniently?
You need to log in to use this function. Qiita can be used more conveniently after logging in.
You seem to be reading articles frequently this month. Qiita can be used more conveniently after logging in.
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away