discourse/app/models/web_hook.rb

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# frozen_string_literal: true
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class WebHook < ActiveRecord::Base
has_and_belongs_to_many :web_hook_event_types
has_and_belongs_to_many :groups
has_and_belongs_to_many :categories
has_and_belongs_to_many :tags
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has_many :web_hook_events, dependent: :destroy
default_scope { order('id ASC') }
validates :payload_url, presence: true, format: URI::regexp(%w(http https))
validates :secret, length: { minimum: 12 }, allow_blank: true
validates_presence_of :content_type
validates_presence_of :last_delivery_status
validates_presence_of :web_hook_event_types, unless: :wildcard_web_hook?
validate :ensure_payload_url_allowed, if: :payload_url_changed?
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before_save :strip_url
def tag_names=(tag_names_arg)
DiscourseTagging.add_or_create_tags_by_name(self, tag_names_arg, unlimited: true)
end
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def self.content_types
@content_types ||= Enum.new('application/json' => 1,
'application/x-www-form-urlencoded' => 2)
end
def self.last_delivery_statuses
@last_delivery_statuses ||= Enum.new(inactive: 1,
failed: 2,
successful: 3,
disabled: 4)
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end
def self.default_event_types
[WebHookEventType.find(WebHookEventType::POST)]
end
def strip_url
self.payload_url = (payload_url || "").strip.presence
end
def self.active_web_hooks(type)
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WebHook.where(active: true)
.joins(:web_hook_event_types)
.where("web_hooks.wildcard_web_hook = ? OR web_hook_event_types.name = ?", true, type.to_s)
.distinct
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end
def self.enqueue_hooks(type, event, opts = {})
active_web_hooks(type).each do |web_hook|
Jobs.enqueue(:emit_web_hook_event, opts.merge(
web_hook_id: web_hook.id, event_name: event.to_s, event_type: type.to_s
))
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end
end
def self.enqueue_object_hooks(type, object, event, serializer = nil, opts = {})
if active_web_hooks(type).exists?
payload = WebHook.generate_payload(type, object, serializer)
WebHook.enqueue_hooks(type, event, opts.merge(
id: object.id,
payload: payload
)
)
end
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end
def self.enqueue_topic_hooks(event, topic, payload = nil)
if active_web_hooks('topic').exists? && topic.present?
payload ||= begin
topic_view = TopicView.new(topic.id, Discourse.system_user)
WebHook.generate_payload(:topic, topic_view, WebHookTopicViewSerializer)
end
WebHook.enqueue_hooks(:topic, event,
id: topic.id,
category_id: topic.category_id,
tag_ids: topic.tags.pluck(:id),
payload: payload
)
end
end
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def self.enqueue_post_hooks(event, post, payload = nil)
if active_web_hooks('post').exists? && post.present?
payload ||= WebHook.generate_payload(:post, post)
WebHook.enqueue_hooks(:post, event,
id: post.id,
category_id: post.topic&.category_id,
tag_ids: post.topic&.tags&.pluck(:id),
payload: payload
)
end
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end
def self.generate_payload(type, object, serializer = nil)
serializer ||= TagSerializer if type == :tag
serializer ||= "WebHook#{type.capitalize}Serializer".constantize
serializer.new(object,
scope: self.guardian,
root: false
).to_json
end
private
def self.guardian
Guardian.new(Discourse.system_user)
end
# This check is to improve UX
# IPs are re-checked at request time
def ensure_payload_url_allowed
return if payload_url.blank?
uri = URI(payload_url.strip)
allowed = begin
FinalDestination::SSRFDetector.lookup_and_filter_ips(uri.hostname).present?
rescue FinalDestination::SSRFDetector::DisallowedIpError
false
end
if !allowed
self.errors.add(:base, I18n.t("webhooks.payload_url.blocked_or_internal"))
end
end
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end
# == Schema Information
#
# Table name: web_hooks
#
# id :integer not null, primary key
# payload_url :string not null
# content_type :integer default(1), not null
# last_delivery_status :integer default(1), not null
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# status :integer default(1), not null
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# secret :string default("")
# wildcard_web_hook :boolean default(FALSE), not null
# verify_certificate :boolean default(TRUE), not null
# active :boolean default(FALSE), not null
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# created_at :datetime not null
# updated_at :datetime not null
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#