discourse/app/controllers/webhooks_controller.rb

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# frozen_string_literal: true
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require "openssl"
class WebhooksController < ActionController::Base
skip_before_action :verify_authenticity_token
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def mailgun
return mailgun_failure if SiteSetting.mailgun_api_key.blank?
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params["event-data"] ? handle_mailgun_new(params) : handle_mailgun_legacy(params)
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end
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def sendgrid
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events = params["_json"] || [params]
events.each do |event|
message_id = Email::MessageIdService.message_id_clean((event["smtp-id"] || ""))
to_address = event["email"]
error_code = event["status"]
if event["event"] == "bounce"
if error_code[Email::SMTP_STATUS_TRANSIENT_FAILURE]
process_bounce(message_id, to_address, SiteSetting.soft_bounce_score, error_code)
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else
process_bounce(message_id, to_address, SiteSetting.hard_bounce_score, error_code)
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end
elsif event["event"] == "dropped"
process_bounce(message_id, to_address, SiteSetting.hard_bounce_score, error_code)
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end
end
success
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end
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def mailjet
events = params["_json"] || [params]
events.each do |event|
message_id = event["CustomID"]
to_address = event["email"]
if event["event"] == "bounce"
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if event["hard_bounce"]
process_bounce(message_id, to_address, SiteSetting.hard_bounce_score)
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else
process_bounce(message_id, to_address, SiteSetting.soft_bounce_score)
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end
end
end
success
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end
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def mandrill
events = params["mandrill_events"]
events.each do |event|
message_id = event.dig("msg", "metadata", "message_id")
to_address = event.dig("msg", "email")
error_code = event.dig("msg", "diag")
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case event["event"]
when "hard_bounce"
process_bounce(message_id, to_address, SiteSetting.hard_bounce_score, error_code)
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when "soft_bounce"
process_bounce(message_id, to_address, SiteSetting.soft_bounce_score, error_code)
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end
end
success
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end
def mandrill_head
# Mandrill sends a HEAD request to validate the webhook before saving
# Rails interprets it as a GET request
success
end
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def postmark
# see https://postmarkapp.com/developer/webhooks/bounce-webhook#bounce-webhook-data
# and https://postmarkapp.com/developer/api/bounce-api#bounce-types
message_id = params["MessageID"]
to_address = params["Email"]
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type = params["Type"]
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case type
when "HardBounce", "SpamNotification", "SpamComplaint"
process_bounce(message_id, to_address, SiteSetting.hard_bounce_score)
when "SoftBounce"
process_bounce(message_id, to_address, SiteSetting.soft_bounce_score)
end
success
end
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def sparkpost
events = params["_json"] || [params]
events.each do |event|
message_event = event.dig("msys", "message_event")
next unless message_event
message_id = message_event.dig("rcpt_meta", "message_id")
to_address = message_event["rcpt_to"]
bounce_class = message_event["bounce_class"]
next unless bounce_class
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bounce_class = bounce_class.to_i
# bounce class definitions: https://support.sparkpost.com/customer/portal/articles/1929896
if bounce_class < 80
if bounce_class == 10 || bounce_class == 25 || bounce_class == 30
process_bounce(message_id, to_address, SiteSetting.hard_bounce_score)
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else
process_bounce(message_id, to_address, SiteSetting.soft_bounce_score)
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end
end
end
success
end
def aws
raw = request.raw_post
json = JSON.parse(raw)
case json["Type"]
when "SubscriptionConfirmation"
Jobs.enqueue(:confirm_sns_subscription, raw: raw, json: json)
when "Notification"
Jobs.enqueue(:process_sns_notification, raw: raw, json: json)
end
success
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end
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private
def mailgun_failure
render body: nil, status: 406
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end
def success
render body: nil, status: 200
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end
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def valid_mailgun_signature?(token, timestamp, signature)
# token is a random 50 characters string
return false if token.blank? || token.size != 50
# prevent replay attacks
key = "mailgun_token_#{token}"
return false unless Discourse.redis.setnx(key, 1)
Discourse.redis.expire(key, 10.minutes)
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# ensure timestamp isn't too far from current time
return false if (Time.at(timestamp.to_i) - Time.now).abs > 12.hours.to_i
# check the signature
signature == OpenSSL::HMAC.hexdigest("SHA256", SiteSetting.mailgun_api_key, "#{timestamp}#{token}")
end
def handle_mailgun_legacy(params)
return mailgun_failure unless valid_mailgun_signature?(params["token"], params["timestamp"], params["signature"])
event = params["event"]
message_id = Email::MessageIdService.message_id_clean(params["Message-Id"])
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to_address = params["recipient"]
error_code = params["code"]
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# only handle soft bounces, because hard bounces are also handled
# by the "dropped" event and we don't want to increase bounce score twice
# for the same message
if event == "bounced" && params["error"][Email::SMTP_STATUS_TRANSIENT_FAILURE]
process_bounce(message_id, to_address, SiteSetting.soft_bounce_score, error_code)
elsif event == "dropped"
process_bounce(message_id, to_address, SiteSetting.hard_bounce_score, error_code)
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end
success
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end
def handle_mailgun_new(params)
signature = params["signature"]
return mailgun_failure unless valid_mailgun_signature?(signature["token"], signature["timestamp"], signature["signature"])
data = params["event-data"]
error_code = params.dig("delivery-status", "code")
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message_id = data.dig("message", "headers", "message-id")
to_address = data["recipient"]
severity = data["severity"]
if data["event"] == "failed"
if severity == "temporary"
process_bounce(message_id, to_address, SiteSetting.soft_bounce_score, error_code)
elsif severity == "permanent"
process_bounce(message_id, to_address, SiteSetting.hard_bounce_score, error_code)
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end
end
success
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end
def process_bounce(message_id, to_address, bounce_score, bounce_error_code = nil)
return if message_id.blank? || to_address.blank?
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email_log = EmailLog.find_by(message_id: message_id, to_address: to_address)
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return if email_log.nil?
email_log.update_columns(bounced: true, bounce_error_code: bounce_error_code)
return if email_log.user.nil? || email_log.user.email.blank?
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Email::Receiver.update_bounce_score(email_log.user.email, bounce_score)
end
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end