discourse/lib/email/message_builder.rb

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# frozen_string_literal: true
# Builds a Mail::Message we can use for sending. Optionally supports using a template
# for the body and subject
module Email
class MessageBuilder
attr_reader :template_args
ALLOW_REPLY_BY_EMAIL_HEADER = 'X-Discourse-Allow-Reply-By-Email'
def initialize(to, opts = nil)
@to = to
@opts = opts || {}
@template_args = {
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site_name: SiteSetting.title,
email_prefix: SiteSetting.email_prefix.presence || SiteSetting.title,
base_url: Discourse.base_url,
user_preferences_url: "#{Discourse.base_url}/my/preferences",
hostname: Discourse.current_hostname,
}.merge!(@opts)
if @template_args[:url].present?
@template_args[:header_instructions] ||= I18n.t('user_notifications.header_instructions', @template_args)
if @opts[:include_respond_instructions] == false
@template_args[:respond_instructions] = ''
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@template_args[:respond_instructions] = I18n.t('user_notifications.pm_participants', @template_args) if @opts[:private_reply]
else
if @opts[:only_reply_by_email]
string = +"user_notifications.only_reply_by_email"
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string << "_pm" if @opts[:private_reply]
else
string = allow_reply_by_email? ? +"user_notifications.reply_by_email" : +"user_notifications.visit_link_to_respond"
string << "_pm" if @opts[:private_reply]
end
@template_args[:respond_instructions] = "---\n" + I18n.t(string, @template_args)
end
if @opts[:add_unsubscribe_link]
unsubscribe_string = if @opts[:mailing_list_mode]
"unsubscribe_mailing_list"
elsif SiteSetting.unsubscribe_via_email_footer
"unsubscribe_link_and_mail"
else
"unsubscribe_link"
end
@template_args[:unsubscribe_instructions] = I18n.t(unsubscribe_string, @template_args)
end
end
end
def subject
if @opts[:template] &&
TranslationOverride.exists?(locale: I18n.locale, translation_key: "#{@opts[:template]}.subject_template")
augmented_template_args = @template_args.merge({
site_name: @template_args[:email_prefix],
optional_re: @opts[:add_re_to_subject] ? I18n.t('subject_re') : '',
optional_pm: @opts[:private_reply] ? @template_args[:subject_pm] : '',
optional_cat: @template_args[:show_category_in_subject] ? "[#{@template_args[:show_category_in_subject]}] " : '',
optional_tags: @template_args[:show_tags_in_subject] ? "#{@template_args[:show_tags_in_subject]} " : '',
topic_title: @template_args[:topic_title] ? @template_args[:topic_title] : '',
})
subject = I18n.t("#{@opts[:template]}.subject_template", augmented_template_args)
elsif @opts[:use_site_subject]
subject = String.new(SiteSetting.email_subject)
subject.gsub!("%{site_name}", @template_args[:email_prefix])
subject.gsub!("%{optional_re}", @opts[:add_re_to_subject] ? I18n.t('subject_re') : '')
subject.gsub!("%{optional_pm}", @opts[:private_reply] ? @template_args[:subject_pm] : '')
subject.gsub!("%{optional_cat}", @template_args[:show_category_in_subject] ? "[#{@template_args[:show_category_in_subject]}] " : '')
subject.gsub!("%{optional_tags}", @template_args[:show_tags_in_subject] ? "#{@template_args[:show_tags_in_subject]} " : '')
subject.gsub!("%{topic_title}", @template_args[:topic_title]) if @template_args[:topic_title] # must be last for safety
elsif @opts[:use_topic_title_subject]
subject = @opts[:add_re_to_subject] ? I18n.t('subject_re') : ''
subject = "#{subject}#{@template_args[:topic_title]}"
elsif @opts[:template]
subject = I18n.t("#{@opts[:template]}.subject_template", @template_args)
else
subject = @opts[:subject]
end
subject
end
def html_part
return unless html_override = @opts[:html_override]
if @template_args[:unsubscribe_instructions].present?
unsubscribe_instructions = PrettyText.cook(@template_args[:unsubscribe_instructions], sanitize: false).html_safe
html_override.gsub!("%{unsubscribe_instructions}", unsubscribe_instructions)
else
html_override.gsub!("%{unsubscribe_instructions}", "")
end
if @template_args[:header_instructions].present?
header_instructions = PrettyText.cook(@template_args[:header_instructions], sanitize: false).html_safe
html_override.gsub!("%{header_instructions}", header_instructions)
else
html_override.gsub!("%{header_instructions}", "")
end
if @template_args[:respond_instructions].present?
respond_instructions = PrettyText.cook(@template_args[:respond_instructions], sanitize: false).html_safe
html_override.gsub!("%{respond_instructions}", respond_instructions)
else
html_override.gsub!("%{respond_instructions}", "")
end
html = UserNotificationRenderer.render(
template: 'layouts/email_template',
format: :html,
locals: { html_body: html_override.html_safe }
)
Mail::Part.new do
content_type 'text/html; charset=UTF-8'
body html
end
end
def body
body = nil
if @opts[:template]
body = I18n.t("#{@opts[:template]}.text_body_template", template_args).dup
else
body = @opts[:body].dup
end
if @template_args[:unsubscribe_instructions].present?
body << "\n"
body << @template_args[:unsubscribe_instructions]
end
body
end
def build_args
args = {
to: @to,
subject: subject,
body: body,
charset: 'UTF-8',
from: from_value,
cc: @opts[:cc]
}
args[:delivery_method_options] = @opts[:delivery_method_options] if @opts[:delivery_method_options]
args[:delivery_method_options] = (args[:delivery_method_options] || {}).merge(return_response: true)
args
end
def header_args
result = {}
if @opts[:add_unsubscribe_link]
unsubscribe_url = @template_args[:unsubscribe_url].presence || @template_args[:user_preferences_url]
result['List-Unsubscribe'] = "<#{unsubscribe_url}>"
end
result['X-Discourse-Post-Id'] = @opts[:post_id].to_s if @opts[:post_id]
result['X-Discourse-Topic-Id'] = @opts[:topic_id].to_s if @opts[:topic_id]
# please, don't send us automatic responses...
result['X-Auto-Response-Suppress'] = 'All'
if !allow_reply_by_email?
# This will end up being the notification_email, which is a
# noreply address.
result['Reply-To'] = from_value
else
# The only reason we use from address for reply to is for group
# SMTP emails, where the person will be replying to the group's
# email_username.
if !@opts[:use_from_address_for_reply_to]
result[ALLOW_REPLY_BY_EMAIL_HEADER] = true
result['Reply-To'] = reply_by_email_address
else
# No point in adding a reply-to header if it is going to be identical
# to the from address/alias. If the from option is not present, then
# the default reply-to address is used.
result['Reply-To'] = from_value if from_value != alias_email(@opts[:from])
end
end
result.merge(MessageBuilder.custom_headers(SiteSetting.email_custom_headers))
end
def self.custom_headers(string)
result = {}
string.split('|').each { |item|
header = item.split(':', 2)
if header.length == 2
name = header[0].strip
value = header[1].strip
result[name] = value if name.length > 0 && value.length > 0
end
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} unless string.nil?
result
end
protected
def allow_reply_by_email?
SiteSetting.reply_by_email_enabled? &&
reply_by_email_address.present? &&
@opts[:allow_reply_by_email]
end
def private_reply?
allow_reply_by_email? && @opts[:private_reply]
end
def from_value
return @from_value if @from_value
@from_value = @opts[:from] || SiteSetting.notification_email
@from_value = alias_email(@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
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@reply_by_email_address =
if private_reply?
alias_email(@reply_by_email_address)
else
site_alias_email(@reply_by_email_address)
end
end
def alias_email(source)
return source if @opts[:from_alias].blank? &&
SiteSetting.email_site_title.blank? &&
SiteSetting.title.blank?
if @opts[:from_alias].present?
%Q|"#{Email.cleanup_alias(@opts[:from_alias])}" <#{source}>|
elsif source == SiteSetting.notification_email || source == SiteSetting.reply_by_email_address
site_alias_email(source)
else
source
end
end
def site_alias_email(source)
from_alias = Email.site_title
%Q|"#{Email.cleanup_alias(from_alias)}" <#{source}>|
end
end
end