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