discourse/lib/email/sender.rb

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#
# A helper class to send an email. It will also handle a nil message, which it considers
# to be "do nothing". This is because some Mailers will decide not to do work for some
# reason. For example, emailing a user too frequently. A nil to address is also considered
# "do nothing"
#
# It also adds an HTML part for the plain text body
#
require_dependency 'email/renderer'
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require 'uri'
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module Email
class Sender
def initialize(message, email_type, user=nil)
@message = message
@email_type = email_type
@user = user
end
def send
return if @message.blank?
return if @message.to.blank?
return if @message.body.blank?
@message.charset = 'UTF-8'
opts = {}
# Only use the html template on digest emails
opts[:html_template] = true if (@email_type == 'digest')
renderer = Email::Renderer.new(@message, opts)
unless @message.html_part
@message.html_part = Mail::Part.new do
content_type 'text/html; charset=UTF-8'
body renderer.html
end
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end
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@message.parts[0].body = @message.parts[0].body.to_s.gsub(/\[\/?email-indent\]/, '')
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@message.text_part.content_type = 'text/plain; charset=UTF-8'
# Set up the email log
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to_address = @message.to
to_address = to_address.first if to_address.is_a?(Array)
email_log = EmailLog.new(email_type: @email_type,
to_address: to_address,
user_id: @user.try(:id))
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host = Email::Sender.host_for(Discourse.base_url)
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@message.header['List-Id'] = Email::Sender.list_id_for(SiteSetting.title, host)
topic_id = header_value('X-Discourse-Topic-Id')
post_id = header_value('X-Discourse-Post-Id')
reply_key = header_value('X-Discourse-Reply-Key')
if topic_id.present?
email_log.topic_id = topic_id
topic_identitfier = "<topic/#{topic_id}@#{host}>"
@message.header['In-Reply-To'] = topic_identitfier
@message.header['References'] = topic_identitfier
end
email_log.post_id = post_id if post_id.present?
email_log.reply_key = reply_key if reply_key.present?
# Remove headers we don't need anymore
@message.header['X-Discourse-Topic-Id'] = nil
@message.header['X-Discourse-Post-Id'] = nil
@message.header['X-Discourse-Reply-Key'] = nil
@message.deliver
# Save and return the email log
email_log.save!
email_log
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end
def self.host_for(base_url)
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host = "localhost"
if base_url.present?
begin
uri = URI.parse(base_url)
host = uri.host.downcase if uri.host.present?
rescue URI::InvalidURIError
end
end
host
end
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def self.list_id_for(site_name, host)
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"\"#{site_name.gsub(/\"/, "'")}\" <discourse.forum.#{Slug.for(site_name)}.#{host}>"
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end
private
def header_value(name)
header = @message.header[name]
return nil unless header
header.value
end
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end
end