discourse/app/models/permalink.rb

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class Permalink < ActiveRecord::Base
belongs_to :topic
belongs_to :post
belongs_to :category
before_validation :normalize_url
class Normalizer
attr_reader :source
def initialize(source)
@source = source
if source.present?
@rules = source.split("|").map do |rule|
parse_rule(rule)
end.compact
end
end
def parse_rule(rule)
return unless rule =~ /\/.*\//
escaping = false
regex = ""
sub = ""
c = 0
rule.chars.each do |l|
c += 1 if !escaping && l == "/"
escaping = l == "\\"
if c > 1
sub << l
else
regex << l
end
end
if regex.length > 1
[Regexp.new(regex[1..-1]), sub[1..-1] || ""] rescue nil
end
end
def normalize(url)
return url unless @rules
@rules.each do |(regex,sub)|
url = url.sub(regex,sub)
end
url
end
end
def self.normalize_url(url)
if url
url = url.strip
url = url[1..-1] if url[0,1] == '/'
end
normalizations = SiteSetting.permalink_normalizations
@normalizer = Normalizer.new(normalizations) unless @normalizer && @normalizer.source == normalizations
@normalizer.normalize(url)
end
def self.find_by_url(url)
find_by(url: normalize_url(url))
end
def normalize_url
self.url = Permalink.normalize_url(url) if url
end
def target_url
return external_url if external_url
return post.url if post
return topic.relative_url if topic
return category.url if category
nil
end
def self.filter_by(url=nil)
permalinks = Permalink
.includes(:topic, :post, :category)
.order('permalinks.created_at desc')
permalinks.where!('url ILIKE :url OR external_url ILIKE :url', url: "%#{url}%") if url.present?
permalinks.limit!(100)
permalinks.to_a
end
end
# == Schema Information
#
# Table name: permalinks
#
# id :integer not null, primary key
# url :string(1000) not null
# topic_id :integer
# post_id :integer
# category_id :integer
# created_at :datetime
# updated_at :datetime
# external_url :string(1000)
#
# Indexes
#
# index_permalinks_on_url (url) UNIQUE
#