Module: Railgun

Defined in:
lib/railgun.rb,
lib/railgun/errors.rb,
lib/railgun/mailer.rb,
lib/railgun/railtie.rb,
lib/railgun/attachment.rb

Defined Under Namespace

Classes: Attachment, ConfigurationError, Error, InternalError, Mailer, Railtie

Class Method Summary collapse

Class Method Details

.build_message_object(mail) ⇒ Object

Acts on a Rails/ActionMailer message object and uses Mailgun::MessageBuilder to construct a new message.

Parameters:

  • mail (Mail::Message) —

    message to transform



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# File 'lib/railgun/mailer.rb', line 161

def build_message_object(mail)
  mb = Mailgun::MessageBuilder.new

  mb.from mail[:from]
  mb.reply_to(mail[:reply_to].to_s) if mail[:reply_to].present?
  mb.template(mail[:template].to_s) if mail[:template].present?
  mb.subject mail.subject
  mb.body_html extract_body_html(mail)
  mb.body_text extract_body_text(mail)
  mb.amp_html extract_amp_html(mail)

  [:to, :cc, :bcc].each do |rcpt_type|
    addrs = mail[rcpt_type] || nil
    case addrs
    when String
      # Likely a single recipient
      mb.add_recipient rcpt_type.to_s, addrs
    when Array
      addrs.each do |addr|
        mb.add_recipient rcpt_type.to_s, addr
      end
    when Mail::Field
      mb.add_recipient rcpt_type.to_s, addrs.to_s
    end
  end

  # v:* attributes (variables)
  mail.mailgun_variables.try(:each) do |name, value|
    mb.variable(name, value)
  end

  return mb.message if mail.attachments.empty?

  mail.attachments.each do |attach|
    attach = Attachment.new(attach, encoding: 'ascii-8bit', inline: attach.inline?)
    attach.attach_to_message! mb
  end

  return mb.message
end

.extract_amp_html(mail) ⇒ String

Returns the decoded AMP HTML from the Mail::Message object if it is available, otherwise nil.

Parameters:

  • mail (Mail::Message) —

    message to transform

Returns:

  • (String) 


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# File 'lib/railgun/mailer.rb', line 236

def extract_amp_html(mail)
  begin
    retrieve_amp_part(mail).body.decoded || nil
  rescue
    nil
  end
end

.extract_body_html(mail) ⇒ String

Returns the decoded HTML body from the Mail::Message object if available, otherwise nil.

Parameters:

  • mail (Mail::Message) —

    message to transform

Returns:

  • (String) 


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# File 'lib/railgun/mailer.rb', line 208

def extract_body_html(mail)
  begin
    retrieve_html_part(mail).body.decoded || nil
  rescue
    nil
  end
end

.extract_body_text(mail) ⇒ String

Returns the decoded text body from the Mail::Message object if it is available, otherwise nil.

Parameters:

  • mail (Mail::Message) —

    message to transform

Returns:

  • (String) 


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# File 'lib/railgun/mailer.rb', line 222

def extract_body_text(mail)
  begin
    retrieve_text_part(mail).body.decoded || nil
  rescue
    nil
  end
end

.retrieve_amp_part(mail) ⇒ Mail::Message

Returns the mail object from the Mail::Message object if AMP part exists, (decomposing multipart into individual format if necessary) otherwise nil.

Parameters:

  • mail (Mail::Message) —

    message to transform

Returns:

  • (Mail::Message) —

    mail message with its content-type = text/x-amp-html



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# File 'lib/railgun/mailer.rb', line 275

def retrieve_amp_part(mail)
  # AMP emails should always be multipart, with an HTML fallback.
  return unless mail.multipart?

  mail.find_first_mime_type('text/x-amp-html')
end

.retrieve_html_part(mail) ⇒ Mail::Message

Returns the mail object from the Mail::Message object if html part exists, (decomposing multipart into individual format if necessary) otherwise nil.

Parameters:

  • mail (Mail::Message) —

    message to transform

Returns:

  • (Mail::Message) —

    mail message with its content-type = text/html



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# File 'lib/railgun/mailer.rb', line 263

def retrieve_html_part(mail)
  return mail.html_part if mail.multipart?
  (mail.mime_type =~ /^text\/html$/i) && mail
end

.retrieve_text_part(mail) ⇒ Mail::Message

Returns the mail object from the Mail::Message object if text part exists, (decomposing multipart into individual format if necessary) otherwise nil.

Parameters:

  • mail (Mail::Message) —

    message to transform

Returns:

  • (Mail::Message) —

    mail message with its content-type = text/plain



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# File 'lib/railgun/mailer.rb', line 251

def retrieve_text_part(mail)
  return mail.text_part if mail.multipart?
  (mail.mime_type =~ /^text\/plain$/i) && mail
end

.transform_for_mailgun(mail) ⇒ Hash

Performs a series of transformations on the ‘mailgun*` attributes. After prefixing them with the proper option type, they are added to the message hash where they will then be sent to the API as JSON.

It is important to note that headers set in ‘mailgun_headers` on the message WILL overwrite headers set via `mail.headers()`.

Parameters:

  • mail (Mail::Message) —

    message to transform

Returns:

  • (Hash) —

    transformed message hash



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# File 'lib/railgun/mailer.rb', line 88

def transform_for_mailgun(mail)
  message = build_message_object(mail)

  # o:* attributes (options)
  mail.mailgun_options.try(:each) do |k, v|
    message["o:#{k}"] = v.dup
  end

  # t:* attributes (options)
  mail.mailgun_template_variables.try(:each) do |k, v|
    message["t:#{k}"] = v.dup
  end

  # support for using ActionMailer's `headers()` inside of the mailer
  # note: this will filter out parameters such as `from`, `to`, and so forth
  #       as they are accepted as POST parameters on the message endpoint.

  msg_headers = Hash.new

  # h:* attributes (headers)

  # Let's set all of these headers on the [Mail::Message] so that
  # the are created inside of a [Mail::Header] instance and processed there.
  mail.headers(mail.mailgun_headers || {})
  mail.header_fields.each do |field|
    header = field.name.downcase
    if msg_headers.include? header
      msg_headers[header] = [msg_headers[header], field.value].flatten
    else
      msg_headers[header] = field.value
    end
  end

  msg_headers.each do |k, v|
    if Railgun::Mailer::IGNORED_HEADERS.include? k.downcase
      Rails.logger.debug("[railgun] ignoring header (using envelope instead): #{k}")
      next
    end

    # Cover cases like `cc`, `bcc` where parameters are valid
    # headers BUT they are submitted as separate POST params
    # and already exist on the message because of the call to
    # `build_message_object`.
    if message.include? k.downcase
      Rails.logger.debug("[railgun] ignoring header (already set): #{k}")
      next
    end

    message["h:#{k}"] = v
  end

  # recipient variables
  message['recipient-variables'] = mail.mailgun_recipient_variables.to_json if mail.mailgun_recipient_variables

  # reject blank values
  message.delete_if do |k, v|
    next true if v.nil?

    # if it's an array remove empty elements
    v.delete_if { |i| i.respond_to?(:empty?) && i.empty? } if v.is_a?(Array)

    v.respond_to?(:empty?) && v.empty?
  end

  return message
end