90 lines
2.5 KiB
Ruby
90 lines
2.5 KiB
Ruby
class ApplicationMailer < ActionMailer::Base
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layout 'mailer'
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private
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def send_mail
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@template ||= "#{self.class.name.underscore}/#{caller[0][/`([^']*)'/, 1]}"
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headers['Message-ID'] = message_id
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if @user.pgp_pubkey.present?
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mail(to: @user.email, subject: "...", content_type: pgp_content_type) do |format|
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format.text { render plain: pgp_content }
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end
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else
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mail(to: @user.email, subject: @subject) do |format|
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format.text { render @template }
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end
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end
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end
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def from_address
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ENV.fetch('SMTP_FROM_ADDRESS', 'accounts@localhost')
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end
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def from_domain
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Mail::Address.new(from_address).domain
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end
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def message_id
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@message_id ||= "#{SecureRandom.uuid}@#{from_domain}"
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end
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def boundary
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@boundary ||= SecureRandom.hex(8)
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end
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def pgp_content_type
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"multipart/encrypted; protocol=\"application/pgp-encrypted\"; boundary=\"------------#{boundary}\""
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end
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def pgp_nested_content
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message_content = render_to_string(template: @template)
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message_content_base64 = Base64.encode64(message_content)
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nested_boundary = SecureRandom.hex(8)
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<<~NESTED_CONTENT
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Content-Type: multipart/mixed; boundary="------------#{nested_boundary}"; protected-headers="v1"
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Subject: #{@subject}
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From: <#{from_address}>
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To: #{@user.display_name || @user.cn} <#{@user.email}>
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Message-ID: <#{message_id}>
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--------------#{nested_boundary}
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Content-Type: text/plain; charset=UTF-8; format=flowed
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Content-Transfer-Encoding: base64
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#{message_content_base64}
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--------------#{nested_boundary}--
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NESTED_CONTENT
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end
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def pgp_content
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encrypted_content = UserManager::PgpEncrypt.call(user: @user, text: pgp_nested_content)
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encrypted_base64 = Base64.encode64(encrypted_content.to_s)
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<<~EMAIL_CONTENT
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This is an OpenPGP/MIME encrypted message (RFC 4880 and 3156)
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--------------#{boundary}
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Content-Type: application/pgp-encrypted
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Content-Description: PGP/MIME version identification
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Version: 1
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--------------#{boundary}
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Content-Type: application/octet-stream; name="encrypted.asc"
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Content-Description: OpenPGP encrypted message
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Content-Disposition: inline; filename="encrypted.asc"
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-----BEGIN PGP MESSAGE-----
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#{encrypted_base64}
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-----END PGP MESSAGE-----
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--------------#{boundary}--
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EMAIL_CONTENT
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end
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end
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