discourse/app/models/topic_link_click.rb

89 lines
2.6 KiB
Ruby

require_dependency 'discourse'
require 'ipaddr'
require 'url_helper'
class TopicLinkClick < ActiveRecord::Base
belongs_to :topic_link, counter_cache: :clicks
belongs_to :user
validates_presence_of :topic_link_id
validates_presence_of :ip_address
WHITELISTED_REDIRECT_HOSTNAMES = Set.new(%W{www.youtube.com youtu.be})
# Create a click from a URL and post_id
def self.create_from(args={})
url = args[:url]
return nil if url.blank?
uri = URI.parse(url) rescue nil
urls = Set.new
urls << url
if url =~ /^http/
urls << url.sub(/^https/, 'http')
urls << url.sub(/^http:/, 'https:')
urls << UrlHelper.schemaless(url)
end
urls << UrlHelper.absolute_without_cdn(url)
urls << uri.path if uri.try(:host) == Discourse.current_hostname
urls << url.sub(/\?.*$/, '') if url.include?('?')
link = TopicLink.select([:id, :user_id])
# test for all possible URLs
link = link.where(Array.new(urls.count, "url = ?").join(" OR "), *urls)
# Find the forum topic link
link = link.where(post_id: args[:post_id]) if args[:post_id].present?
# If we don't have a post, just find the first occurance of the link
link = link.where(topic_id: args[:topic_id]) if args[:topic_id].present?
link = link.first
# If no link is found...
unless link.present?
# ... return the url for relative links or when using the same host
return url if url =~ /^\// || uri.try(:host) == Discourse.current_hostname
# If we have it somewhere else on the site, just allow the redirect.
# This is likely due to a onebox of another topic.
link = TopicLink.find_by(url: url)
return link.url if link.present?
return nil unless uri
# Only redirect to whitelisted hostnames
return WHITELISTED_REDIRECT_HOSTNAMES.include?(uri.hostname) ? url : nil
end
return url if args[:user_id] && link.user_id == args[:user_id]
# Rate limit the click counts to once in 24 hours
rate_key = "link-clicks:#{link.id}:#{args[:user_id] || args[:ip]}"
if $redis.setnx(rate_key, "1")
$redis.expire(rate_key, 1.day.to_i)
create!(topic_link_id: link.id, user_id: args[:user_id], ip_address: args[:ip])
end
url
end
end
# == Schema Information
#
# Table name: topic_link_clicks
#
# id :integer not null, primary key
# topic_link_id :integer not null
# user_id :integer
# created_at :datetime not null
# updated_at :datetime not null
# ip_address :inet not null
#
# Indexes
#
# by_link (topic_link_id)
#