require "digest"
require_dependency "new_post_manager"
require_dependency "post_action_creator"
require_dependency "html_to_markdown"
require_dependency "plain_text_to_markdown"
require_dependency "upload_creator"
module Email
class Receiver
include ActionView::Helpers::NumberHelper
# If you add a new error, you need to
# * add it to Email::Processor#handle_failure()
# * add text to server.en.yml (parent key: "emails.incoming.errors")
class ProcessingError < StandardError; end
class EmptyEmailError < ProcessingError; end
class ScreenedEmailError < ProcessingError; end
class UserNotFoundError < ProcessingError; end
class AutoGeneratedEmailError < ProcessingError; end
class BouncedEmailError < ProcessingError; end
class NoBodyDetectedError < ProcessingError; end
class NoSenderDetectedError < ProcessingError; end
class FromReplyByAddressError < ProcessingError; end
class InactiveUserError < ProcessingError; end
class SilencedUserError < ProcessingError; end
class BadDestinationAddress < ProcessingError; end
class StrangersNotAllowedError < ProcessingError; end
class InsufficientTrustLevelError < ProcessingError; end
class ReplyUserNotMatchingError < ProcessingError; end
class TopicNotFoundError < ProcessingError; end
class TopicClosedError < ProcessingError; end
class InvalidPost < ProcessingError; end
class InvalidPostAction < ProcessingError; end
class UnsubscribeNotAllowed < ProcessingError; end
class EmailNotAllowed < ProcessingError; end
class OldDestinationError < ProcessingError; end
attr_reader :incoming_email
attr_reader :raw_email
attr_reader :mail
attr_reader :message_id
COMMON_ENCODINGS ||= [-"utf-8", -"windows-1252", -"iso-8859-1"]
def self.formats
@formats ||= Enum.new(plaintext: 1, markdown: 2)
end
def initialize(mail_string, opts = {})
raise EmptyEmailError if mail_string.blank?
@staged_users = []
@raw_email = mail_string
COMMON_ENCODINGS.each do |encoding|
fixed = try_to_encode(mail_string, encoding)
break @raw_email = fixed if fixed.present?
end
@mail = Mail.new(@raw_email)
@message_id = @mail.message_id.presence || Digest::MD5.hexdigest(mail_string)
@opts = opts
end
def process!
return if is_blacklisted?
DistributedMutex.synchronize(@message_id) do
begin
return if IncomingEmail.exists?(message_id: @message_id)
ensure_valid_address_lists
@from_email, @from_display_name = parse_from_field(@mail)
@incoming_email = create_incoming_email
process_internal
rescue => e
error = e.to_s
error = e.class.name if error.blank?
@incoming_email.update_columns(error: error) if @incoming_email
delete_staged_users
raise
end
end
end
def ensure_valid_address_lists
[:to, :cc, :bcc].each do |field|
addresses = @mail[field]
if addresses&.errors.present?
@mail[field] = addresses.to_s.scan(/\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\b/i)
end
end
end
def is_blacklisted?
return false if SiteSetting.ignore_by_title.blank?
Regexp.new(SiteSetting.ignore_by_title, Regexp::IGNORECASE) =~ @mail.subject
end
def create_incoming_email
IncomingEmail.create(
message_id: @message_id,
raw: @raw_email,
subject: subject,
from_address: @from_email,
to_addresses: @mail.to&.map(&:downcase)&.join(";"),
cc_addresses: @mail.cc&.map(&:downcase)&.join(";"),
)
end
def process_internal
raise BouncedEmailError if is_bounce?
raise NoSenderDetectedError if @from_email.blank?
raise FromReplyByAddressError if is_from_reply_by_email_address?
raise ScreenedEmailError if ScreenedEmail.should_block?(@from_email)
user = find_user(@from_email)
if user.present?
log_and_validate_user(user)
else
raise UserNotFoundError unless SiteSetting.enable_staged_users
end
body, elided = select_body
body ||= ""
raise NoBodyDetectedError if body.blank? && attachments.empty?
if is_auto_generated? && !sent_to_mailinglist_mirror?
@incoming_email.update_columns(is_auto_generated: true)
if SiteSetting.block_auto_generated_emails?
raise AutoGeneratedEmailError
end
end
if action = subscription_action_for(body, subject)
raise UnsubscribeNotAllowed if user.nil?
send_subscription_mail(action, user)
return
end
# Lets create a staged user if there isn't one yet. We will try to
# delete staged users in process!() if something bad happens.
if user.nil?
user = find_or_create_user(@from_email, @from_display_name)
log_and_validate_user(user)
end
if post = find_related_post
create_reply(user: user,
raw: body,
elided: elided,
post: post,
topic: post.topic,
skip_validations: user.staged?)
else
first_exception = nil
destinations.each do |destination|
begin
process_destination(destination, user, body, elided)
rescue => e
first_exception ||= e
else
return
end
end
raise first_exception if first_exception
if post = find_related_post(force: true)
if Guardian.new(user).can_see_post?(post) && post.created_at < 90.days.ago
raise OldDestinationError.new("#{Discourse.base_url}/p/#{post.id}")
end
end
raise BadDestinationAddress
end
end
def log_and_validate_user(user)
@incoming_email.update_columns(user_id: user.id)
raise InactiveUserError if !user.active && !user.staged
raise SilencedUserError if user.silenced?
end
def is_bounce?
return false unless @mail.bounced? || verp
@incoming_email.update_columns(is_bounce: true)
if verp && (bounce_key = verp[/\+verp-(\h{32})@/, 1]) && (email_log = EmailLog.find_by(bounce_key: bounce_key))
email_log.update_columns(bounced: true)
email = email_log.user.try(:email).presence
end
email ||= @from_email
if @mail.error_status.present? && Array.wrap(@mail.error_status).any? { |s| s.start_with?("4.") }
Email::Receiver.update_bounce_score(email, SiteSetting.soft_bounce_score)
else
Email::Receiver.update_bounce_score(email, SiteSetting.hard_bounce_score)
end
true
end
def is_from_reply_by_email_address?
Email::Receiver.reply_by_email_address_regex.match(@from_email)
end
def verp
@verp ||= all_destinations.select { |to| to[/\+verp-\h{32}@/] }.first
end
def self.update_bounce_score(email, score)
if user = User.find_by_email(email)
old_bounce_score = user.user_stat.bounce_score
new_bounce_score = old_bounce_score + score
range = (old_bounce_score + 1..new_bounce_score)
user.user_stat.bounce_score = new_bounce_score
user.user_stat.reset_bounce_score_after = SiteSetting.reset_bounce_score_after_days.days.from_now
user.user_stat.save!
if user.active && range === SiteSetting.bounce_score_threshold_deactivate
user.update!(active: false)
reason = I18n.t("user.deactivated", email: user.email)
StaffActionLogger.new(Discourse.system_user).log_user_deactivate(user, reason)
elsif range === SiteSetting.bounce_score_threshold
# NOTE: we check bounce_score before sending emails, nothing to do here other than log it happened.
reason = I18n.t("user.email.revoked", email: user.email, date: user.user_stat.reset_bounce_score_after)
StaffActionLogger.new(Discourse.system_user).log_revoke_email(user, reason)
end
end
end
def is_auto_generated?
return false if SiteSetting.auto_generated_whitelist.split('|').include?(@from_email)
@mail[:precedence].to_s[/list|junk|bulk|auto_reply/i] ||
@mail[:from].to_s[/(mailer[\-_]?daemon|post[\-_]?master|no[\-_]?reply)@/i] ||
@mail[:subject].to_s[/^\s*(Auto:|Automatic reply|Autosvar|Automatisk svar|Automatisch antwoord|Abwesenheitsnotiz|Risposta Non al computer|Automatisch antwoord|Auto Response|Respuesta automática|Fuori sede|Out of Office|Frånvaro|Réponse automatique)/i] ||
@mail.header.to_s[/auto[\-_]?(response|submitted|replied|reply|generated|respond)|holidayreply|machinegenerated/i]
end
def select_body
text = nil
html = nil
text_content_type = nil
if @mail.multipart?
text = fix_charset(@mail.text_part)
html = fix_charset(@mail.html_part)
text_content_type = @mail.text_part&.content_type
elsif @mail.content_type.to_s["text/html"]
html = fix_charset(@mail)
elsif @mail.content_type.blank? || @mail.content_type["text/plain"]
text = fix_charset(@mail)
text_content_type = @mail.content_type
end
return unless text.present? || html.present?
if text.present?
text = trim_discourse_markers(text)
text, elided_text = trim_reply_and_extract_elided(text)
if @opts[:convert_plaintext] || sent_to_mailinglist_mirror?
text_content_type ||= ""
converter_opts = {
format_flowed: !!(text_content_type =~ /format\s*=\s*["']?flowed["']?/i),
delete_flowed_space: !!(text_content_type =~ /DelSp\s*=\s*["']?yes["']?/i)
}
text = PlainTextToMarkdown.new(text, converter_opts).to_markdown
elided_text = PlainTextToMarkdown.new(elided_text, converter_opts).to_markdown
end
end
markdown, elided_markdown = if html.present?
# use the first html extracter that matches
if html_extracter = HTML_EXTRACTERS.select { |_, r| html[r] }.min_by { |_, r| html =~ r }
doc = Nokogiri::HTML.fragment(html)
self.send(:"extract_from_#{html_extracter[0]}", doc)
else
markdown = HtmlToMarkdown.new(html, keep_img_tags: true, keep_cid_imgs: true).to_markdown
markdown = trim_discourse_markers(markdown)
trim_reply_and_extract_elided(markdown)
end
end
if text.blank? || (SiteSetting.incoming_email_prefer_html && markdown.present?)
return [markdown, elided_markdown, Receiver::formats[:markdown]]
else
return [text, elided_text, Receiver::formats[:plaintext]]
end
end
def to_markdown(html, elided_html)
markdown = HtmlToMarkdown.new(html, keep_img_tags: true, keep_cid_imgs: true).to_markdown
[EmailReplyTrimmer.trim(markdown), HtmlToMarkdown.new(elided_html).to_markdown]
end
HTML_EXTRACTERS ||= [
[:gmail, /class="gmail_(?!default)/],
[:outlook, /id="(divRplyFwdMsg|Signature)"/],
[:word, /class="WordSection1"/],
[:exchange, /name="message(Body|Reply)Section"/],
[:apple_mail, /id="AppleMailSignature"/],
[:mozilla, /class="moz-/],
[:protonmail, /class="protonmail_/],
[:zimbra, /data-marker="__/],
[:newton, /(id|class)="cm_/],
]
def extract_from_gmail(doc)
# GMail adds a bunch of 'gmail_' prefixed classes like: gmail_signature, gmail_extra, gmail_quote
# Just elide them all except for 'gmail_default'
elided = doc.css("*[class^='gmail_']:not([class*='gmail_default'])").remove
to_markdown(doc.to_html, elided.to_html)
end
def extract_from_outlook(doc)
# Outlook properly identifies the signature and any replied/forwarded email
# Use their id to remove them and anything that comes after
elided = doc.css("#Signature, #Signature ~ *, hr, #divRplyFwdMsg, #divRplyFwdMsg ~ *").remove
to_markdown(doc.to_html, elided.to_html)
end
def extract_from_word(doc)
# Word (?) keeps the content in the 'WordSection1' class and uses <p> tags
# When there's something else (<table>, <div>, etc..) there's high chance it's a signature or forwarded email
elided = doc.css(".WordSection1 > :not(p):not(ul):first-of-type, .WordSection1 > :not(p):not(ul):first-of-type ~ *").remove
to_markdown(doc.at(".WordSection1").to_html, elided.to_html)
end
def extract_from_exchange(doc)
# Exchange is using the 'messageReplySection' class for forwarded emails
# And 'messageBodySection' for the actual email
elided = doc.css("div[name='messageReplySection']").remove
to_markdown(doc.css("div[name='messageReplySection']").to_html, elided.to_html)
end
def extract_from_apple_mail(doc)
# AppleMail is the worst. It adds 'AppleMailSignature' ids (!) to several div/p with no deterministic rules
# Our best guess is to elide whatever comes after that.
elided = doc.css("#AppleMailSignature:last-of-type ~ *").remove
to_markdown(doc.to_html, elided.to_html)
end
def extract_from_mozilla(doc)
# Mozilla (Thunderbird ?) properly identifies signature and forwarded emails
# Remove them and anything that comes after
elided = doc.css("*[class^='moz-'], *[class^='moz-'] ~ *").remove
to_markdown(doc.to_html, elided.to_html)
end
def extract_from_protonmail(doc)
# Removes anything that has a class starting with "protonmail_" and everything after that
elided = doc.css("*[class^='protonmail_'], *[class^='protonmail_'] ~ *").remove
to_markdown(doc.to_html, elided.to_html)
end
def extract_from_zimbra(doc)
# Removes anything that has a 'data-marker' attribute
elided = doc.css("*[data-marker]").remove
to_markdown(doc.to_html, elided.to_html)
end
def extract_from_newton(doc)
# Removes anything that has an id or a class starting with 'cm_'
elided = doc.css("*[id^='cm_'], *[class^='cm_']").remove
to_markdown(doc.to_html, elided.to_html)
end
def trim_reply_and_extract_elided(text)
return [text, ""] if @opts[:skip_trimming]
EmailReplyTrimmer.trim(text, true)
end
def fix_charset(mail_part)
return nil if mail_part.blank? || mail_part.body.blank?
string = mail_part.body.decoded rescue nil
return nil if string.blank?
# common encodings
encodings = COMMON_ENCODINGS.dup
encodings.unshift(mail_part.charset) if mail_part.charset.present?
# mail (>=2.5) decodes mails with 8bit transfer encoding to utf-8, so
# always try UTF-8 first
if mail_part.content_transfer_encoding == "8bit"
encodings.delete("UTF-8")
encodings.unshift("UTF-8")
end
encodings.uniq.each do |encoding|
fixed = try_to_encode(string, encoding)
return fixed if fixed.present?
end
nil
end
def try_to_encode(string, encoding)
encoded = string.encode("UTF-8", encoding)
!encoded.nil? && encoded.valid_encoding? ? encoded : nil
rescue Encoding::InvalidByteSequenceError,
Encoding::UndefinedConversionError,
Encoding::ConverterNotFoundError
nil
end
def previous_replies_regex
@previous_replies_regex ||= /^--[- ]\n\*#{I18n.t("user_notifications.previous_discussion")}\*\n/im
end
def trim_discourse_markers(reply)
reply.split(previous_replies_regex)[0]
end
def parse_from_field(mail)
return unless mail[:from]
if mail[:from].errors.blank?
mail[:from].address_list.addresses.each do |address_field|
address_field.decoded
from_address = address_field.address
from_display_name = address_field.display_name.try(:to_s)
return [from_address&.downcase, from_display_name&.strip] if from_address["@"]
end
end
return extract_from_address_and_name(mail.from) if mail.from.is_a? String
if mail.from.is_a? Mail::AddressContainer
mail.from.each do |from|
from_address, from_display_name = extract_from_address_and_name(from)
return [from_address, from_display_name] if from_address
end
end
nil
rescue StandardError
nil
end
def extract_from_address_and_name(value)
if value[/<[^>]+>/]
from_address = value[/<([^>]+)>/, 1]
from_display_name = value[/^([^<]+)/, 1]
end
if (from_address.blank? || !from_address["@"]) && value[/\[mailto:[^\]]+\]/]
from_address = value[/\[mailto:([^\]]+)\]/, 1]
from_display_name = value[/^([^\[]+)/, 1]
end
[from_address&.downcase, from_display_name&.strip]
end
def subject
@suject ||= @mail.subject.presence || I18n.t("emails.incoming.default_subject", email: @from_email)
end
def find_user(email)
User.find_by_email(email)
end
def find_or_create_user(email, display_name)
user = nil
User.transaction do
user = User.find_by_email(email)
if user.nil? && SiteSetting.enable_staged_users
raise EmailNotAllowed unless EmailValidator.allowed?(email)
begin
username = UserNameSuggester.sanitize_username(display_name) if display_name.present?
user = User.create!(
email: email,
username: UserNameSuggester.suggest(username.presence || email),
name: display_name.presence || User.suggest_name(email),
staged: true
)
@staged_users << user
rescue
user = nil
end
end
end
user
end
def all_destinations
@all_destinations ||= [
@mail.destinations,
[@mail[:x_forwarded_to]].flatten.compact.map(&:decoded),
[@mail[:delivered_to]].flatten.compact.map(&:decoded),
].flatten.select(&:present?).uniq.lazy
end
def destinations
@destinations ||= all_destinations
.map { |d| Email::Receiver.check_address(d) }
.reject(&:blank?)
end
def sent_to_mailinglist_mirror?
destinations.each do |destination|
next unless destination[:type] == :category
category = destination[:obj]
return true if category.mailinglist_mirror?
end
false
end
def self.check_address(address)
# only check for a group/category when 'email_in' is enabled
if SiteSetting.email_in
group = Group.find_by_email(address)
return { type: :group, obj: group } if group
category = Category.find_by_email(address)
return { type: :category, obj: category } if category
end
# reply
match = Email::Receiver.reply_by_email_address_regex.match(address)
if match && match.captures
match.captures.each do |c|
next if c.blank?
email_log = EmailLog.for(c)
return { type: :reply, obj: email_log } if email_log
end
end
nil
end
def process_destination(destination, user, body, elided)
return if SiteSetting.enable_forwarded_emails &&
has_been_forwarded? &&
process_forwarded_email(destination, user)
case destination[:type]
when :group
group = destination[:obj]
create_group_post(group, user, body, elided)
when :category
category = destination[:obj]
raise StrangersNotAllowedError if user.staged? && !category.email_in_allow_strangers
raise InsufficientTrustLevelError if !user.has_trust_level?(SiteSetting.email_in_min_trust) && !sent_to_mailinglist_mirror?
create_topic(user: user,
raw: body,
elided: elided,
title: subject,
category: category.id,
skip_validations: user.staged?)
when :reply
email_log = destination[:obj]
if email_log.user_id != user.id && !forwarded_reply_key?(email_log, user)
raise ReplyUserNotMatchingError, "email_log.user_id => #{email_log.user_id.inspect}, user.id => #{user.id.inspect}"
end
create_reply(user: user,
raw: body,
elided: elided,
post: email_log.post,
topic: email_log.post.topic,
skip_validations: user.staged?)
end
end
def create_group_post(group, user, body, elided)
message_ids = Email::Receiver.extract_reply_message_ids(@mail, max_message_id_count: 5)
post_ids = []
incoming_emails = IncomingEmail
.where(message_id: message_ids)
.addressed_to_user(user)
.pluck(:post_id, :to_addresses, :cc_addresses)
incoming_emails.each do |post_id, to_addresses, cc_addresses|
post_ids << post_id if contains_email_address_of_user?(to_addresses, user) ||
contains_email_address_of_user?(cc_addresses, user)
end
if post_ids.any? && post = Post.where(id: post_ids).order(:created_at).last
create_reply(user: user,
raw: body,
elided: elided,
post: post,
topic: post.topic,
skip_validations: true)
else
create_topic(user: user,
raw: body,
elided: elided,
title: subject,
archetype: Archetype.private_message,
target_group_names: [group.name],
is_group_message: true,
skip_validations: true)
end
end
def forwarded_reply_key?(email_log, user)
incoming_emails = IncomingEmail
.joins(:post)
.where('posts.topic_id = ?', email_log.topic_id)
.addressed_to(email_log.reply_key)
.addressed_to_user(user)
.pluck(:to_addresses, :cc_addresses)
incoming_emails.each do |to_addresses, cc_addresses|
next unless contains_email_address_of_user?(to_addresses, user) ||
contains_email_address_of_user?(cc_addresses, user)
return true if contains_reply_by_email_address(to_addresses, email_log.reply_key) ||
contains_reply_by_email_address(cc_addresses, email_log.reply_key)
end
false
end
def contains_email_address_of_user?(addresses, user)
return false if addresses.blank?
addresses = addresses.split(";")
user.user_emails.any? { |user_email| addresses.include?(user_email.email) }
end
def contains_reply_by_email_address(addresses, reply_key)
return false if addresses.blank?
addresses.split(";").each do |address|
match = Email::Receiver.reply_by_email_address_regex.match(address)
return true if match && match.captures&.include?(reply_key)
end
false
end
def has_been_forwarded?
subject[/^[[:blank:]]*(fwd?|tr)[[:blank:]]?:/i] && embedded_email_raw.present?
end
def embedded_email_raw
return @embedded_email_raw if @embedded_email_raw
text = fix_charset(@mail.multipart? ? @mail.text_part : @mail)
@embedded_email_raw, @before_embedded = EmailReplyTrimmer.extract_embedded_email(text)
@embedded_email_raw
end
def process_forwarded_email(destination, user)
embedded = Mail.new(embedded_email_raw)
email, display_name = parse_from_field(embedded)
return false if email.blank? || !email["@"]
embedded_user = find_or_create_user(email, display_name)
raw = try_to_encode(embedded.decoded, "UTF-8").presence || embedded.to_s
title = embedded.subject.presence || subject
case destination[:type]
when :group
group = destination[:obj]
post = create_topic(user: embedded_user,
raw: raw,
title: title,
archetype: Archetype.private_message,
target_usernames: [user.username],
target_group_names: [group.name],
is_group_message: true,
skip_validations: true,
created_at: embedded.date)
when :category
category = destination[:obj]
return false if user.staged? && !category.email_in_allow_strangers
return false if !user.has_trust_level?(SiteSetting.email_in_min_trust)
post = create_topic(user: embedded_user,
raw: raw,
title: title,
category: category.id,
skip_validations: embedded_user.staged?,
created_at: embedded.date)
else
return false
end
if post&.topic
# mark post as seen for the forwarder
PostTiming.record_timing(user_id: user.id, topic_id: post.topic_id, post_number: post.post_number, msecs: 5000)
# create reply when available
if @before_embedded.present?
post_type = Post.types[:regular]
post_type = Post.types[:whisper] if post.topic.private_message? && group.usernames[user.username]
create_reply(user: user,
raw: @before_embedded,
post: post,
topic: post.topic,
post_type: post_type,
skip_validations: user.staged?)
end
end
true
end
def self.reply_by_email_address_regex(extract_reply_key = true)
reply_addresses = [SiteSetting.reply_by_email_address]
reply_addresses << (SiteSetting.alternative_reply_by_email_addresses.presence || "").split("|")
reply_addresses.flatten!
reply_addresses.select!(&:present?)
reply_addresses.map! { |a| Regexp.escape(a) }
reply_addresses.map! { |a| a.gsub("\+", "\+?") }
reply_addresses.map! { |a| a.gsub(Regexp.escape("%{reply_key}"), "(\\h{32})?") }
if reply_addresses.empty?
/$a/ # a regex that can never match
else
/#{reply_addresses.join("|")}/
end
end
def group_incoming_emails_regex
@group_incoming_emails_regex ||= Regexp.union Group.pluck(:incoming_email).select(&:present?).map { |e| e.split("|") }.flatten.uniq
end
def category_email_in_regex
@category_email_in_regex ||= Regexp.union Category.pluck(:email_in).select(&:present?).map { |e| e.split("|") }.flatten.uniq
end
def find_related_post(force: false)
return if !force && SiteSetting.find_related_post_with_key && !sent_to_mailinglist_mirror?
message_ids = Email::Receiver.extract_reply_message_ids(@mail, max_message_id_count: 5)
return if message_ids.empty?
host = Email::Sender.host_for(Discourse.base_url)
post_id_regexp = Regexp.new "topic/\\d+/(\\d+)@#{Regexp.escape(host)}"
topic_id_regexp = Regexp.new "topic/(\\d+)@#{Regexp.escape(host)}"
post_ids = message_ids.map { |message_id| message_id[post_id_regexp, 1] }.compact.map(&:to_i)
post_ids << Post.where(topic_id: message_ids.map { |message_id| message_id[topic_id_regexp, 1] }.compact, post_number: 1).pluck(:id)
post_ids << EmailLog.where(message_id: message_ids).pluck(:post_id)
post_ids << IncomingEmail.where(message_id: message_ids).pluck(:post_id)
post_ids.flatten!
post_ids.compact!
post_ids.uniq!
return if post_ids.empty?
Post.where(id: post_ids).order(:created_at).last
end
def self.extract_reply_message_ids(mail, max_message_id_count:)
message_ids = [mail.in_reply_to, Email::Receiver.extract_references(mail.references)]
message_ids.flatten!
message_ids.select!(&:present?)
message_ids.uniq!
message_ids.first(max_message_id_count)
end
def self.extract_references(references)
if Array === references
references
elsif references.present?
references.split(/[\s,]/).map { |r| r.tr("<>", "") }
end
end
def likes
@likes ||= Set.new ["+1", "<3", "❤", I18n.t('post_action_types.like.title').downcase]
end
def subscription_action_for(body, subject)
return unless SiteSetting.unsubscribe_via_email
if ([subject, body].compact.map(&:to_s).map(&:downcase) & ['unsubscribe']).any?
:confirm_unsubscribe
end
end
def post_action_for(body)
PostActionType.types[:like] if likes.include?(body.strip.downcase)
end
def create_topic(options = {})
create_post_with_attachments(options)
end
def create_reply(options = {})
raise TopicNotFoundError if options[:topic].nil? || options[:topic].trashed?
if post_action_type = post_action_for(options[:raw])
create_post_action(options[:user], options[:post], post_action_type)
else
raise TopicClosedError if options[:topic].closed?
options[:topic_id] = options[:post].try(:topic_id)
options[:reply_to_post_number] = options[:post].try(:post_number)
options[:is_group_message] = options[:topic].private_message? && options[:topic].allowed_groups.exists?
create_post_with_attachments(options)
end
end
def create_post_action(user, post, type)
PostActionCreator.new(user, post).perform(type)
rescue PostAction::AlreadyActed
# it's cool, don't care
rescue Discourse::InvalidAccess => e
raise InvalidPostAction.new(e)
end
def is_whitelisted_attachment?(attachment)
attachment.content_type !~ SiteSetting.attachment_content_type_blacklist_regex &&
attachment.filename !~ SiteSetting.attachment_filename_blacklist_regex
end
def attachments
# strip blacklisted attachments (mostly signatures)
@attachments ||= begin
attachments = @mail.attachments.select { |attachment| is_whitelisted_attachment?(attachment) }
attachments << @mail if @mail.attachment? && is_whitelisted_attachment?(@mail)
attachments
end
end
def create_post_with_attachments(options = {})
# deal with attachments
options[:raw] = add_attachments(options[:raw], options[:user].id, options)
create_post(options)
end
def add_attachments(raw, user_id, options = {})
attachments.each do |attachment|
tmp = Tempfile.new(["discourse-email-attachment", File.extname(attachment.filename)])
begin
# read attachment
File.open(tmp.path, "w+b") { |f| f.write attachment.body.decoded }
# create the upload for the user
opts = { for_group_message: options[:is_group_message] }
upload = UploadCreator.new(tmp, attachment.filename, opts).create_for(user_id)
if upload&.valid?
# try to inline images
if attachment.content_type&.start_with?("image/")
if raw[attachment.url]
raw.sub!(attachment.url, upload.url)
elsif raw[/\[image:.*?\d+[^\]]*\]/i]
raw.sub!(/\[image:.*?\d+[^\]]*\]/i, attachment_markdown(upload))
else
raw << "\n\n#{attachment_markdown(upload)}\n\n"
end
else
raw << "\n\n#{attachment_markdown(upload)}\n\n"
end
end
ensure
tmp&.close!
end
end
raw
end
def attachment_markdown(upload)
if FileHelper.is_image?(upload.original_filename)
"<img src='#{upload.url}' width='#{upload.width}' height='#{upload.height}'>"
else
"<a class='attachment' href='#{upload.url}'>#{upload.original_filename}</a> (#{number_to_human_size(upload.filesize)})"
end
end
def create_post(options = {})
options[:via_email] = true
options[:raw_email] = @raw_email
# ensure posts aren't created in the future
options[:created_at] ||= @mail.date
if options[:created_at].nil?
raise InvalidPost, "No post creation date found. Is the e-mail missing a Date: header?"
end
options[:created_at] = DateTime.now if options[:created_at] > DateTime.now
is_private_message = options[:archetype] == Archetype.private_message ||
options[:topic].try(:private_message?)
# only add elided part in messages
if options[:elided].present? && (SiteSetting.always_show_trimmed_content || is_private_message)
options[:raw] << Email::Receiver.elided_html(options[:elided])
end
if sent_to_mailinglist_mirror?
options[:skip_validations] = true
options[:skip_guardian] = true
end
user = options.delete(:user)
result = NewPostManager.new(user, options).perform
raise InvalidPost, result.errors.full_messages.join("\n") if result.errors.any?
if result.post
@incoming_email.update_columns(topic_id: result.post.topic_id, post_id: result.post.id)
if result.post.topic && result.post.topic.private_message?
add_other_addresses(result.post, user)
end
end
result.post
end
def self.elided_html(elided)
html = "\n\n" << "<details class='elided'>" << "\n"
html << "<summary title='#{I18n.t('emails.incoming.show_trimmed_content')}'>···</summary>" << "\n\n"
html << elided << "\n\n"
html << "</details>" << "\n"
html
end
def add_other_addresses(post, sender)
%i(to cc bcc).each do |d|
if @mail[d] && @mail[d].address_list && @mail[d].address_list.addresses
@mail[d].address_list.addresses.each do |address_field|
begin
address_field.decoded
email = address_field.address.downcase
display_name = address_field.display_name.try(:to_s)
next unless email["@"]
if should_invite?(email)
user = find_or_create_user(email, display_name)
if user && can_invite?(post.topic, user)
post.topic.topic_allowed_users.create!(user_id: user.id)
TopicUser.auto_notification_for_staging(user.id, post.topic_id, TopicUser.notification_reasons[:auto_watch])
post.topic.add_small_action(sender, "invited_user", user.username)
end
# cap number of staged users created per email
if @staged_users.count > SiteSetting.maximum_staged_users_per_email
post.topic.add_moderator_post(sender, I18n.t("emails.incoming.maximum_staged_user_per_email_reached"))
return
end
end
rescue ActiveRecord::RecordInvalid, EmailNotAllowed
# don't care if user already allowed or the user's email address is not allowed
end
end
end
end
end
def should_invite?(email)
email !~ Email::Receiver.reply_by_email_address_regex &&
email !~ group_incoming_emails_regex &&
email !~ category_email_in_regex
end
def can_invite?(topic, user)
!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
def send_subscription_mail(action, user)
message = SubscriptionMailer.send(action, user)
Email::Sender.new(message, :subscription).send
end
def delete_staged_users
@staged_users.each do |user|
if @incoming_email.user.id == user.id
@incoming_email.update_columns(user_id: nil)
end
if user.posts.count == 0
UserDestroyer.new(Discourse.system_user).destroy(user, quiet: true)
end
end
end
end
end