ありがとう Slack

mail2slack.rb

require "digest/md5"
require "net/https"
require "json"
require "mail"
require "time"
require "uri"

def parse_envelope(data)
  if data.multipart?
    data.parts.map do |pt|
      if pt.content_type == "text/plain"
        return pt.decoded
      end
    end

    return data.parts[0].decoded
  else
    return data.decoded
  end
end

slack_url = URI.parse("") # slack webhook url
header = {
  "channel" => "@gomasy",
  "username" => "E-mail Alert",
  "icon_emoji" => ":envelope_with_arrow:",
  "text" => "メールを受信しました。",
}

begin
  mail = Mail.new(STDIN.read)
  body = JSON.generate(header.merge({
    "attachments" => [
      "author_name" => mail.from[0],
      "author_icon" => %(https://www.gravatar.com/avatar/#{Digest::MD5.hexdigest(mail.from[0])}?d=mp&s=32),
      "fields" => [
        {
          "title" => mail.subject,
          "value" => parse_envelope(mail),
        },
      ],
      "footer" => mail.to[0],
      "ts" => Time.parse(mail.date.to_s).to_i,
    ],
  }))
rescue
  body = JSON.generate(header.merge({
    "attachments" => [
      {
        "text" => "Can not decode an entire message.",
        "color" => "danger",
      },
    ],
  }))
end

Net::HTTP.post(slack_url, body)