デコメールをrubyから送る方法 - 計算機と戯れる日々

rubyでおくるとき - 計算機と戯れる日々では色つき文字や画像を添付する送り方をアップしていなかったことに今日気がついた。なんのための備忘録だろうか（笑

ということでさらす。

#!/usr/bin/ruby
require 'net/smtp'

Net::SMTP.start( 'smtpServerAddress', 25 ) {|smtp|
    smtp.send_mail <<EndOfMail, 'bar@from.com', 'foo@docomo.ne.jp'
To: foo@docomo.ne.jp
From: bar@from.com
Content-Type: text/html
Subject: test
MIME-Version: 1.0
Content-Type: multipart/related; boundary="mm00"

--mm00
Content-Type: multipart/alternative; boundary="mm01"

--mm01
Content-Type: text/plain

ここはHTMLで読めないときに表示される部分
--mm01
Content-type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit

<font color="red">赤い文字</font><br />
<font color="blue">青い文字</font><br />
<br /><br /><a href="http://d.hatena.ne.jp/n9d/">URL貼り付け例</a><br />
本文
--mm01--
EndOfMail
}

画像を含む場合の送信方法は以下のとおり

#!/usr/bin/ruby
require 'net/smtp'

Net::SMTP.start( 'smtpServerAddress', 25 ) {|smtp|
    smtp.send_mail <<EndOfMail, 'bar@from.com', 'foo@docomo.ne.jp'
To: foo@docomo.ne.jp
From: bar@from.com
Content-Type: text/html
Subject: test
MIME-Version: 1.0
Content-Type: multipart/related; boundary="mm00"

--mm00
Content-Type: multipart/alternative; boundary="mm01"

--mm01
Content-Type: text/plain

ここはHTMLで読めないときに表示される部分
--mm01
Content-type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit

<font color="red">赤い文字</font><br />
<font color="blue">青い文字</font><br />
<br /><br /><a href="http://d.hatena.ne.jp/n9d/">URL貼り付け例</a><br />
１枚目の画像
<br />
<img src="cid:10">
<br />
２枚目の画像
<br />
<img src="cid:11">
<br />
本文
--mm01--
--mm00
Content-Type: image/jpeg; name="a.jpg"
Content-Transfer-Encoding: base64
Content-ID: <10>
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--mm00
Content-Type: image/jpeg; name="b.jpg"
Content-Transfer-Encoding: base64
Content-ID: <11>
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--mm00--
EndOfMail
}

画像ファイルは以下の出力結果を張り付け。

$ wget http://www.hatena.ne.jp/images/top/headbutton_diary.gif
$ convert -quality 30 -resize 100x100 headbutton_diary.gif h2.jpg
$ cat h2.jpg | ruby -e 'print [STDIN.read].pack("m")'