Class: Mail::Gpg::InlineDecryptedMessage

Inherits:
Message
  • Object
show all
Defined in:
lib/mail/gpg/inline_decrypted_message.rb

Class Method Summary collapse

Class Method Details

.setup(cipher_mail, options = {}) ⇒ Object

options are:

:verify: decrypt and verify



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# File 'lib/mail/gpg/inline_decrypted_message.rb', line 15

def self.setup(cipher_mail, options = {})
  if cipher_mail.multipart?
    self.new do
      Mail::Gpg.copy_headers cipher_mail, self

      # Drop the HTML-part of a multipart/alternative-message if it is
      # inline-encrypted: that ciphertext is probably wrapped in HTML,
      # which GnuPG chokes upon, so we would have to parse the HTML to
      # handle the message-part properly.
      # Also it's not clear how to handle the resulting plain-text: is
      # it HTML or simple text?  That depends on the sending MUA and
      # the original input.
      # In summary, that's too much complications.
      if cipher_mail.mime_type == 'multipart/alternative' &&
          cipher_mail.html_part.present? &&
          cipher_mail.html_part.body.decoded.include?('-----BEGIN PGP MESSAGE-----')
        cipher_mail.parts.delete_if do |part|
          part[:content_type].content_type == 'text/html'
        end
        # Set the content-type of the newly generated message to
        # something less confusing.
        content_type 'multipart/mixed'
        # Leave a marker for other code.
        header['X-MailGpg-Deleted-Html-Part'] = 'true'
      end

      cipher_mail.parts.each do |part|
        p = VerifiedPart.new do |p|
          if part.has_content_type? && /application\/(?:octet-stream|pgp-encrypted)/ =~ part.mime_type
            # encrypted attachment, we set the content_type to the generic 'application/octet-stream'
            # and remove the .pgp/gpg/asc from name/filename in header fields
            decrypted = GpgmeHelper.decrypt(part.decoded, options)
            p.verify_result decrypted.verify_result if options[:verify]
            p.content_type part.content_type.sub(/application\/(?:octet-stream|pgp-encrypted)/, 'application/octet-stream')
              .sub(/name=(?:"')?(.*)\.(?:pgp|gpg|asc)(?:"')?/, 'name="\1"')
            p.content_disposition part.content_disposition.sub(/filename=(?:"')?(.*)\.(?:pgp|gpg|asc)(?:"')?/, 'filename="\1"')
            p.content_transfer_encoding Mail::Encodings::Base64
            p.body Mail::Encodings::Base64::encode(decrypted.to_s)
          else
            body = part.body.decoded
            if body.include?('-----BEGIN PGP MESSAGE-----')
              decrypted = GpgmeHelper.decrypt(body, options)
              p.verify_result decrypted.verify_result if options[:verify]
              p.body decrypted.to_s
            else
              p.content_type part.content_type
              p.content_transfer_encoding part.content_transfer_encoding
              p.body part.body.to_s
            end
          end
        end
        add_part p
      end
    end # of multipart
  else
    decrypted = cipher_mail.body.empty? ? '' : GpgmeHelper.decrypt(cipher_mail.body.decoded, options)
    self.new do
      cipher_mail.header.fields.each do |field|
        header[field.name] = field.value
      end
      body decrypted.to_s
      verify_result decrypted.verify_result if options[:verify] && '' != decrypted
    end
  end
end