discourse/app/models/incoming_link.rb

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class IncomingLink < ActiveRecord::Base
belongs_to :topic
belongs_to :user
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validates :url, presence: true
validate :referer_valid
before_validation :extract_domain
before_validation :extract_topic_and_post
after_create :update_link_counts
def self.add(request,current_user=nil)
user_id, host, referer = nil
if request['u']
u = User.select(:id).where(username_lower: request['u'].downcase).first
user_id = u.id if u
end
if request.referer.present?
host = URI.parse(request.referer).host
referer = request.referer[0..999]
end
if host != request.host && (user_id || referer)
cid = current_user.id if current_user
unless cid && cid == user_id
IncomingLink.create(url: request.url,
referer: referer,
user_id: user_id,
current_user_id: cid,
ip_address: request.remote_ip)
end
end
end
# Internal: Extract the domain from link.
def extract_domain
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if referer.present?
self.domain = URI.parse(self.referer).host
self.referer = nil unless self.domain
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end
end
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# Internal: If link is internal and points to topic/post, extract their IDs.
def extract_topic_and_post
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if url.present?
parsed = URI.parse(url)
begin
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# TODO achieve same thing with no exception
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params = Rails.application.routes.recognize_path(parsed.path)
if self.topic_id = params[:topic_id]
self.post_number = params[:post_number] || 1
end
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rescue ActionController::RoutingError
# If we can't route to the url, that's OK. Don't save those two fields.
end
end
end
# Internal: Update appropriate link counts.
def update_link_counts
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if topic_id.present?
exec_sql("UPDATE topics
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SET incoming_link_count = incoming_link_count + 1
WHERE id = ?", topic_id)
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if post_number.present?
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exec_sql("UPDATE posts
SET incoming_link_count = incoming_link_count + 1
WHERE topic_id = ? and post_number = ?", topic_id, post_number)
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end
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end
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end
protected
def referer_valid
return true unless referer
if (referer.length < 3 || referer.length > 100) || (domain.length < 1 || domain.length > 100)
# internal, no need to localize
errors.add(:referer, 'referer is invalid')
false
else
true
end
end
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end
# == Schema Information
#
# Table name: incoming_links
#
# id :integer not null, primary key
# url :string(1000) not null
# referer :string(1000)
# domain :string(100)
# topic_id :integer
# post_number :integer
# created_at :datetime not null
# updated_at :datetime not null
# user_id :integer
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# ip_address :inet
# current_user_id :integer
#
# Indexes
#
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# incoming_index (topic_id,post_number)
# index_incoming_links_on_created_at_and_domain (created_at,domain)
# index_incoming_links_on_created_at_and_user_id (created_at,user_id)
#