discourse/lib/email/message_builder.rb

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# Builds a Mail::Mesage we can use for sending. Optionally supports using a template
# for the body and subject
module Email
module BuildEmailHelper
def build_email(*builder_args)
builder = Email::MessageBuilder.new(*builder_args)
headers(builder.header_args) if builder.header_args.present?
mail(builder.build_args)
end
end
class MessageBuilder
def initialize(to, opts=nil)
@to = to
@opts = opts || {}
end
def subject
subject = @opts[:subject]
subject = I18n.t("#{@opts[:template]}.subject_template", template_args) if @opts[:template]
subject
end
def body
body = @opts[:body]
body = I18n.t("#{@opts[:template]}.text_body_template", template_args) if @opts[:template]
if @opts[:add_unsubscribe_link]
body << "\n"
body << I18n.t('unsubscribe_link', template_args)
end
body
end
def template_args
@template_args ||= { site_name: SiteSetting.title,
base_url: Discourse.base_url,
user_preferences_url: "#{Discourse.base_url}/user_preferences" }.merge!(@opts)
end
def build_args
{ to: @to,
subject: subject,
body: body,
charset: 'UTF-8',
from: from_value }
end
def header_args
result = {}
if @opts[:add_unsubscribe_link]
result['List-Unsubscribe'] = "<#{template_args[:user_preferences_url]}>" if @opts[:add_unsubscribe_link]
end
if allow_reply_by_email?
result['Discourse-Reply-Key'] = reply_key
result['Reply-To'] = reply_by_email_address
else
result['Reply-To'] = from_value
end
result
end
protected
def reply_key
@reply_key ||= SecureRandom.hex(16)
end
def allow_reply_by_email?
SiteSetting.reply_by_email_enabled? &&
reply_by_email_address.present? &&
@opts[:allow_reply_by_email]
end
def from_value
return @from_value if @from_value
@from_value = @opts[:from] || SiteSetting.notification_email
@from_value = alias_email(@from_value)
@from_value
end
def reply_by_email_address
return @reply_by_email_address if @reply_by_email_address
return nil unless SiteSetting.reply_by_email_address.present?
@reply_by_email_address = SiteSetting.reply_by_email_address.dup
@reply_by_email_address.gsub!("%{reply_key}", reply_key)
@reply_by_email_address = alias_email(@reply_by_email_address)
@reply_by_email_address
end
def alias_email(source)
return source if @opts[:from_alias].blank?
"#{@opts[:from_alias]} <#{source}>"
end
end
end