/lib/email/sender.rb
Ruby | 194 lines | 131 code | 41 blank | 22 comment | 32 complexity | 6fad3a29762ba55d332505e01f8f7941 MD5 | raw file
- #
- # 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'
- require 'uri'
- require 'net/smtp'
- SMTP_CLIENT_ERRORS = [Net::SMTPFatalError, Net::SMTPSyntaxError]
- module Email
- class Sender
- def initialize(message, email_type, user=nil)
- @message = message
- @email_type = email_type
- @user = user
- end
- def send
- return if SiteSetting.disable_emails && @email_type.to_s != "admin_login"
- return if ActionMailer::Base::NullMail === @message
- return if ActionMailer::Base::NullMail === (@message.message rescue nil)
- return skip(I18n.t('email_log.message_blank')) if @message.blank?
- return skip(I18n.t('email_log.message_to_blank')) if @message.to.blank?
- if @message.text_part
- return skip(I18n.t('email_log.text_part_body_blank')) if @message.text_part.body.to_s.blank?
- else
- return skip(I18n.t('email_log.body_blank')) if @message.body.to_s.blank?
- end
- @message.charset = 'UTF-8'
- opts = {}
- renderer = Email::Renderer.new(@message, opts)
- if @message.html_part
- @message.html_part.body = renderer.html
- else
- @message.html_part = Mail::Part.new do
- content_type 'text/html; charset=UTF-8'
- body renderer.html
- end
- end
- @message.parts[0].body = @message.parts[0].body.to_s.gsub(/\[\/?email-indent\]/, '')
- # Fix relative (ie upload) HTML links in markdown which do not work well in plain text emails.
- # These are the links we add when a user uploads a file or image.
- # Ideally we would parse general markdown into plain text, but that is almost an intractable problem.
- url_prefix = Discourse.base_url
- @message.parts[0].body = @message.parts[0].body.to_s.gsub(/<a class="attachment" href="(\/uploads\/default\/[^"]+)">([^<]*)<\/a>/, '[\2]('+url_prefix+'\1)')
- @message.parts[0].body = @message.parts[0].body.to_s.gsub(/<img src="(\/uploads\/default\/[^"]+)"([^>]*)>/, '![]('+url_prefix+'\1)')
- @message.text_part.content_type = 'text/plain; charset=UTF-8'
- # Set up the email log
- email_log = EmailLog.new(email_type: @email_type, to_address: to_address, user_id: @user.try(:id))
- host = Email::Sender.host_for(Discourse.base_url)
- topic_id = header_value('X-Discourse-Topic-Id')
- post_id = header_value('X-Discourse-Post-Id')
- reply_key = header_value('X-Discourse-Reply-Key')
- # always set a default Message ID from the host
- uuid = SecureRandom.uuid
- @message.header['Message-ID'] = "<#{uuid}@#{host}>"
- if topic_id.present?
- email_log.topic_id = topic_id
- incoming_email = IncomingEmail.find_by(post_id: post_id, topic_id: topic_id)
- incoming_message_id = nil
- incoming_message_id = "<#{incoming_email.message_id}>" if incoming_email.try(:message_id).present?
- topic_identifier = "<topic/#{topic_id}@#{host}>"
- post_identifier = "<topic/#{topic_id}/#{post_id}@#{host}>"
- @message.header['Message-ID'] = post_identifier
- @message.header['In-Reply-To'] = incoming_message_id || topic_identifier
- @message.header['References'] = topic_identifier
- topic = Topic.where(id: topic_id).first
- # http://www.ietf.org/rfc/rfc2919.txt
- if topic && topic.category && !topic.category.uncategorized?
- list_id = "<#{topic.category.name.downcase.gsub(' ', '-')}.#{host}>"
- # subcategory case
- if !topic.category.parent_category_id.nil?
- parent_category_name = Category.find_by(id: topic.category.parent_category_id).name
- list_id = "<#{topic.category.name.downcase.gsub(' ', '-')}.#{parent_category_name.downcase.gsub(' ', '-')}.#{host}>"
- end
- else
- list_id = "<#{host}>"
- end
- # http://www.ietf.org/rfc/rfc3834.txt
- @message.header['Precedence'] = 'list'
- @message.header['List-ID'] = list_id
- @message.header['List-Archive'] = topic.url if topic
- end
- if reply_key.present? && @message.header['Reply-To'] =~ /\<([^\>]+)\>/
- email = Regexp.last_match[1]
- @message.header['List-Post'] = "<mailto:#{email}>"
- end
- if SiteSetting.reply_by_email_address.present? && SiteSetting.reply_by_email_address["+"]
- email_log.bounce_key = SecureRandom.hex
- # WARNING: RFC claims you can not set the Return Path header, this is 100% correct
- # however Rails has special handling for this header and ends up using this value
- # as the Envelope From address so stuff works as expected
- @message.header[:return_path] = SiteSetting.reply_by_email_address.sub("%{reply_key}", "verp-#{email_log.bounce_key}")
- 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 if topic_id.present?
- @message.header['X-Discourse-Post-Id'] = nil if post_id.present?
- @message.header['X-Discourse-Reply-Key'] = nil if reply_key.present?
- # Suppress images from short emails
- if SiteSetting.strip_images_from_short_emails &&
- @message.html_part.body.to_s.bytesize <= SiteSetting.short_email_length &&
- @message.html_part.body =~ /<img[^>]+>/
- style = Email::Styles.new(@message.html_part.body.to_s)
- @message.html_part.body = style.strip_avatars_and_emojis
- end
- begin
- @message.deliver_now
- rescue *SMTP_CLIENT_ERRORS => e
- return skip(e.message)
- end
- # Save and return the email log
- email_log.save!
- email_log
- end
- def to_address
- @to_address ||= begin
- to = @message.try(:to)
- to = to.first if Array === to
- to.presence || "no_email_found"
- end
- end
- def self.host_for(base_url)
- 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
- private
- def header_value(name)
- header = @message.header[name]
- return nil unless header
- header.value
- end
- def skip(reason)
- EmailLog.create!(
- email_type: @email_type,
- to_address: to_address,
- user_id: @user.try(:id),
- skipped: true,
- skipped_reason: "[Sender] #{reason}"
- )
- end
- end
- end