discourse/lib/topic_retriever.rb

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class TopicRetriever
def initialize(embed_url, opts=nil)
@embed_url = embed_url
@opts = opts || {}
end
def retrieve
perform_retrieve unless (invalid_host? || retrieved_recently?)
end
private
def invalid_host?
SiteSetting.embeddable_host != URI(@embed_url).host
rescue URI::InvalidURIError
# An invalid URI is an invalid host
true
end
def retrieved_recently?
# We can disable the throttle for some users, such as staff
return false if @opts[:no_throttle]
# Throttle other users to once every 60 seconds
retrieved_key = "retrieved:#{@embed_url}"
if $redis.setnx(retrieved_key, "1")
$redis.expire(retrieved_key, 60)
return false
end
true
end
def perform_retrieve
# It's possible another process or job found the embed already. So if that happened bail out.
return if TopicEmbed.where(embed_url: @embed_url).exists?
# First check RSS if that is enabled
if SiteSetting.feed_polling_enabled?
Jobs::PollFeed.new.execute({})
return if TopicEmbed.where(embed_url: @embed_url).exists?
end
fetch_http
end
def fetch_http
user = User.where(username_lower: SiteSetting.embed_by_username.downcase).first
return if user.blank?
TopicEmbed.import_remote(user, @embed_url)
end
end