524 lines
18 KiB
Ruby
524 lines
18 KiB
Ruby
require "digest"
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require_dependency "new_post_manager"
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require_dependency "post_action_creator"
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require_dependency "email/html_cleaner"
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module Email
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class Receiver
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include ActionView::Helpers::NumberHelper
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class ProcessingError < StandardError; end
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class EmptyEmailError < ProcessingError; end
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class ScreenedEmailError < ProcessingError; end
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class UserNotFoundError < ProcessingError; end
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class AutoGeneratedEmailError < ProcessingError; end
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class AutoGeneratedEmailReplyError < ProcessingError; end
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class BouncedEmailError < ProcessingError; end
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class NoBodyDetectedError < ProcessingError; end
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class InactiveUserError < ProcessingError; end
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class BlockedUserError < ProcessingError; end
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class BadDestinationAddress < ProcessingError; end
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class StrangersNotAllowedError < ProcessingError; end
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class InsufficientTrustLevelError < ProcessingError; end
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class ReplyUserNotMatchingError < ProcessingError; end
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class TopicNotFoundError < ProcessingError; end
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class TopicClosedError < ProcessingError; end
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class InvalidPost < ProcessingError; end
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class InvalidPostAction < ProcessingError; end
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attr_reader :incoming_email
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def initialize(mail_string)
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raise EmptyEmailError if mail_string.blank?
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@staged_users_created = 0
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@raw_email = mail_string
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@mail = Mail.new(@raw_email)
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@message_id = @mail.message_id.presence || Digest::MD5.hexdigest(mail_string)
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end
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def process!
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@from_email, @from_display_name = parse_from_field
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@incoming_email = find_or_create_incoming_email
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process_internal
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rescue => e
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@incoming_email.update_columns(error: e.to_s)
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raise
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end
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def find_or_create_incoming_email
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IncomingEmail.find_or_create_by(message_id: @message_id) do |ie|
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ie.raw = @raw_email
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ie.subject = subject
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ie.from_address = @from_email
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ie.to_addresses = @mail.to.map(&:downcase).join(";") if @mail.to.present?
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ie.cc_addresses = @mail.cc.map(&:downcase).join(";") if @mail.cc.present?
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end
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end
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def process_internal
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raise ScreenedEmailError if ScreenedEmail.should_block?(@from_email)
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user = find_or_create_user(@from_email, @from_display_name)
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raise UserNotFoundError if user.nil?
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@incoming_email.update_columns(user_id: user.id)
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raise BouncedEmailError if is_bounce?
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raise InactiveUserError if !user.active && !user.staged
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raise BlockedUserError if user.blocked
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body, @elided = select_body
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body ||= ""
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raise NoBodyDetectedError if body.blank? && !@mail.has_attachments?
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if is_auto_generated?
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@incoming_email.update_columns(is_auto_generated: true)
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raise AutoGeneratedEmailReplyError if check_reply_to_auto_generated_header
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raise AutoGeneratedEmailError if SiteSetting.block_auto_generated_emails?
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end
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if action = subscription_action_for(body, subject)
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message = SubscriptionMailer.send(action, user)
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Email::Sender.new(message, :subscription).send
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elsif post = find_related_post
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create_reply(user: user,
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raw: body,
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post: post,
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topic: post.topic,
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skip_validations: user.staged?)
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else
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destination = destinations.first
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raise BadDestinationAddress if destination.blank?
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case destination[:type]
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when :group
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group = destination[:obj]
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create_topic(user: user,
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raw: body,
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title: subject,
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archetype: Archetype.private_message,
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target_group_names: [group.name],
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is_group_message: true,
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skip_validations: true)
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when :category
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category = destination[:obj]
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raise StrangersNotAllowedError if user.staged? && !category.email_in_allow_strangers
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raise InsufficientTrustLevelError if !user.has_trust_level?(SiteSetting.email_in_min_trust)
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create_topic(user: user,
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raw: body,
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title: subject,
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category: category.id,
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skip_validations: user.staged?)
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when :reply
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email_log = destination[:obj]
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raise ReplyUserNotMatchingError if email_log.user_id != user.id
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create_reply(user: user,
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raw: body,
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post: email_log.post,
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topic: email_log.post.topic)
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end
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end
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end
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SOFT_BOUNCE_SCORE ||= 1
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HARD_BOUNCE_SCORE ||= 2
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def is_bounce?
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return false unless @mail.bounced? || verp
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@incoming_email.update_columns(is_bounce: true)
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if verp
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bounce_key = verp[/\+verp-(\h{32})@/, 1]
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if bounce_key && (email_log = EmailLog.find_by(bounce_key: bounce_key))
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email_log.update_columns(bounced: true)
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if @mail.error_status.present?
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if @mail.error_status.start_with?("4.")
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update_bounce_score(email_log.user.email, SOFT_BOUNCE_SCORE)
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elsif @mail.error_status.start_with?("5.")
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update_bounce_score(email_log.user.email, HARD_BOUNCE_SCORE)
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end
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elsif is_auto_generated?
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update_bounce_score(email_log.user.email, HARD_BOUNCE_SCORE)
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end
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end
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end
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true
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end
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def verp
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@verp ||= all_destinations.select { |to| to[/\+verp-\h{32}@/] }.first
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end
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def update_bounce_score(email, score)
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# only update bounce score once per day
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key = "bounce_score:#{email}:#{Date.today}"
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if $redis.setnx(key, "1")
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$redis.expire(key, 25.hours)
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if user = User.find_by(email: email)
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user.user_stat.bounce_score += score
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user.user_stat.reset_bounce_score_after = 30.days.from_now
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user.user_stat.save
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if user.user_stat.bounce_score >= SiteSetting.bounce_score_threshold
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StaffActionLogger.new(Discourse.system_user).log_revoke_email(user)
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end
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end
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true
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else
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false
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end
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end
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def is_auto_generated?
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return false if SiteSetting.auto_generated_whitelist.split('|').include?(@from_email)
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@mail[:precedence].to_s[/list|junk|bulk|auto_reply/i] ||
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@mail[:from].to_s[/(mailer-?daemon|postmaster|noreply)@/i] ||
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@mail.header.to_s[/auto[\-_]?(response|submitted|replied|reply|generated|respond)|holidayreply|machinegenerated/i]
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end
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def select_body
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text = nil
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html = nil
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elided = nil
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if @mail.multipart?
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text = fix_charset(@mail.text_part)
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html = fix_charset(@mail.html_part)
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elsif @mail.content_type.to_s["text/html"]
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html = fix_charset(@mail)
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else
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text = fix_charset(@mail)
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end
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# prefer text over html
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text = trim_discourse_markers(text) if text.present?
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text, elided = EmailReplyTrimmer.trim(text, true) if text.present?
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return [text, elided] if text.present?
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# clean the html if that's all we've got
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html = Email::HtmlCleaner.new(html).output_html if html.present?
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html = trim_discourse_markers(html) if html.present?
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html, elided = EmailReplyTrimmer.trim(html, true) if html.present?
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return [html, elided] if html.present?
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end
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def fix_charset(mail_part)
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return nil if mail_part.blank? || mail_part.body.blank?
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string = mail_part.body.decoded rescue nil
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return nil if string.blank?
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# 1) use the charset provided
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if mail_part.charset.present?
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fixed = try_to_encode(string, mail_part.charset)
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return fixed if fixed.present?
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end
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# 2) try most used encodings
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try_to_encode(string, "UTF-8") || try_to_encode(string, "ISO-8859-1")
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end
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def try_to_encode(string, encoding)
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encoded = string.encode("UTF-8", encoding)
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encoded.present? && encoded.valid_encoding? ? encoded : nil
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rescue Encoding::InvalidByteSequenceError,
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Encoding::UndefinedConversionError,
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Encoding::ConverterNotFoundError
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nil
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end
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def previous_replies_regex
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@previous_replies_regex ||= /^--[- ]\n\*#{I18n.t("user_notifications.previous_discussion")}\*\n/im
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end
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def trim_discourse_markers(reply)
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reply.split(previous_replies_regex)[0]
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end
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def parse_from_field
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if @mail[:from].errors.blank?
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address_field = @mail[:from].address_list.addresses.first
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address_field.decoded
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from_address = address_field.address
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from_display_name = address_field.display_name.try(:to_s)
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else
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from_address = @mail.from[/<([^>]+)>/, 1]
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from_display_name = @mail.from[/^([^<]+)/, 1]
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end
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[from_address.downcase, from_display_name]
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end
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def subject
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@suject ||= @mail.subject.presence || I18n.t("emails.incoming.default_subject", email: @from_email)
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end
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def find_or_create_user(email, display_name)
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user = nil
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User.transaction do
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begin
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user = User.find_by_email(email)
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if user.nil? && SiteSetting.enable_staged_users
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username = UserNameSuggester.sanitize_username(display_name) if display_name.present?
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user = User.create!(
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email: email,
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username: UserNameSuggester.suggest(username.presence || email),
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name: display_name.presence || User.suggest_name(email),
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staged: true
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)
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@staged_users_created += 1
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end
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rescue
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user = nil
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end
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end
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user
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end
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def all_destinations
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@all_destinations ||= [
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@mail.destinations,
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[@mail[:x_forwarded_to]].flatten.compact.map(&:decoded),
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[@mail[:delivered_to]].flatten.compact.map(&:decoded),
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].flatten.select(&:present?).uniq.lazy
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end
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def destinations
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all_destinations
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.map { |d| check_address(d) }
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.drop_while(&:blank?)
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end
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def check_address(address)
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# only check for a group/category when 'email_in' is enabled
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if SiteSetting.email_in
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group = Group.find_by_email(address)
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return { type: :group, obj: group } if group
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category = Category.find_by_email(address)
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return { type: :category, obj: category } if category
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end
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# reply
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match = reply_by_email_address_regex.match(address)
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if match && match[1].present?
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email_log = EmailLog.for(match[1])
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return { type: :reply, obj: email_log } if email_log
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end
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end
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def reply_by_email_address_regex
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@reply_by_email_address_regex ||= Regexp.new Regexp.escape(SiteSetting.reply_by_email_address)
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.gsub(Regexp.escape("%{reply_key}"), "([[:xdigit:]]{32})")
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end
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def group_incoming_emails_regex
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@group_incoming_emails_regex ||= Regexp.union Group.pluck(:incoming_email).select(&:present?).map { |e| e.split("|") }.flatten.uniq
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end
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def category_email_in_regex
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@category_email_in_regex ||= Regexp.union Category.pluck(:email_in).select(&:present?).map { |e| e.split("|") }.flatten.uniq
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end
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def find_related_post
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message_ids = [@mail.in_reply_to, Email::Receiver.extract_references(@mail.references)]
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message_ids.flatten!
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message_ids.select!(&:present?)
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message_ids.uniq!
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return if message_ids.empty?
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Post.where(id: IncomingEmail.where(message_id: message_ids).select(:post_id))
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.order(created_at: :desc)
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.first
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end
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def self.extract_references(references)
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if Array === references
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references
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elsif references.present?
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references.split(/[\s,]/).map { |r| r.sub(/^</, "").sub(/>$/, "") }
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end
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end
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def likes
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@likes ||= Set.new ["+1", I18n.t('post_action_types.like.title').downcase]
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end
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def subscription_action_for(body, subject)
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return unless SiteSetting.unsubscribe_via_email
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if ([subject, body].compact.map(&:to_s).map(&:downcase) & ['unsubscribe']).any?
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:confirm_unsubscribe
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end
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end
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def post_action_for(body)
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if likes.include?(body.strip.downcase)
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PostActionType.types[:like]
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end
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end
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def create_topic(options={})
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create_post_with_attachments(options)
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end
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def create_reply(options={})
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raise TopicNotFoundError if options[:topic].nil? || options[:topic].trashed?
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raise TopicClosedError if options[:topic].closed?
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if post_action_type = post_action_for(options[:raw])
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create_post_action(options[:user], options[:post], post_action_type)
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else
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options[:topic_id] = options[:post].try(:topic_id)
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options[:reply_to_post_number] = options[:post].try(:post_number)
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options[:is_group_message] = options[:topic].private_message? && options[:topic].allowed_groups.exists?
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create_post_with_attachments(options)
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end
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end
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def create_post_action(user, post, type)
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PostActionCreator.new(user, post).perform(type)
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rescue PostAction::AlreadyActed
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# it's cool, don't care
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rescue Discourse::InvalidAccess => e
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raise InvalidPostAction.new(e)
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end
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def create_post_with_attachments(options={})
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# deal with attachments
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@mail.attachments.each do |attachment|
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tmp = Tempfile.new("discourse-email-attachment")
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begin
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# read attachment
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File.open(tmp.path, "w+b") { |f| f.write attachment.body.decoded }
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# create the upload for the user
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opts = { is_attachment_for_group_message: options[:is_group_message] }
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upload = Upload.create_for(options[:user].id, tmp, attachment.filename, tmp.size, opts)
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if upload && upload.errors.empty?
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# try to inline images
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if attachment.content_type.start_with?("image/") && options[:raw][/\[image: .+ \d+\]/]
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options[:raw].sub!(/\[image: .+ \d+\]/, attachment_markdown(upload))
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else
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options[:raw] << "\n\n#{attachment_markdown(upload)}\n\n"
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end
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end
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ensure
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tmp.try(:close!) rescue nil
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end
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end
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create_post(options)
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end
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def attachment_markdown(upload)
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if FileHelper.is_image?(upload.original_filename)
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"<img src='#{upload.url}' width='#{upload.width}' height='#{upload.height}'>"
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else
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"<a class='attachment' href='#{upload.url}'>#{upload.original_filename}</a> (#{number_to_human_size(upload.filesize)})"
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end
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end
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def create_post(options={})
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options[:via_email] = true
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options[:raw_email] = @raw_email
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# ensure posts aren't created in the future
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options[:created_at] = [@mail.date, DateTime.now].min
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# only add elided part in messages
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if @elided.present? && options[:topic].try(:private_message?)
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options[:raw] << "\n\n" << "<details class='elided'>" << "\n"
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options[:raw] << "<summary title='#{I18n.t('emails.incoming.show_trimmed_content')}'>···</summary>" << "\n"
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options[:raw] << @elided << "\n"
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options[:raw] << "</details>" << "\n"
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end
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user = options.delete(:user)
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manager = NewPostManager.new(user, options)
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result = manager.perform
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raise InvalidPost, result.errors.full_messages.join("\n") if result.errors.any?
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if result.post
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@incoming_email.update_columns(topic_id: result.post.topic_id, post_id: result.post.id)
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if result.post.topic && result.post.topic.private_message?
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add_other_addresses(result.post.topic, user)
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end
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end
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end
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def add_other_addresses(topic, sender)
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%i(to cc bcc).each do |d|
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if @mail[d] && @mail[d].address_list && @mail[d].address_list.addresses
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@mail[d].address_list.addresses.each do |address_field|
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begin
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address_field.decoded
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email = address_field.address.downcase
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display_name = address_field.display_name.try(:to_s)
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if should_invite?(email)
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user = find_or_create_user(email, display_name)
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if user && can_invite?(topic, user)
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topic.topic_allowed_users.create!(user_id: user.id)
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topic.add_small_action(sender, "invited_user", user.username)
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end
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# cap number of staged users created per email
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if @staged_users_created > SiteSetting.maximum_staged_users_per_email
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topic.add_moderator_post(sender, I18n.t("emails.incoming.maximum_staged_user_per_email_reached"))
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return
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end
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end
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rescue ActiveRecord::RecordInvalid
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# don't care if user already allowed
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end
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end
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end
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end
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end
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def should_invite?(email)
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email !~ reply_by_email_address_regex &&
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email !~ group_incoming_emails_regex &&
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email !~ category_email_in_regex
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end
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def can_invite?(topic, user)
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!topic.topic_allowed_users.where(user_id: user.id).exists? &&
|
|
!topic.topic_allowed_groups.where("group_id IN (SELECT group_id FROM group_users WHERE user_id = ?)", user.id).exists?
|
|
end
|
|
|
|
private
|
|
|
|
def check_reply_to_auto_generated_header
|
|
headers = Mail::Header.new(@mail.body.to_s.gsub("\r\n\r\n", "\r\n")).to_a
|
|
|
|
index = headers.find_index do |f|
|
|
f.name == Email::MessageBuilder::REPLY_TO_AUTO_GENERATED_HEADER_KEY
|
|
end
|
|
|
|
if index
|
|
headers[index].value == Email::MessageBuilder::REPLY_TO_AUTO_GENERATED_HEADER_VALUE
|
|
end
|
|
end
|
|
|
|
end
|
|
|
|
end
|