discourse/lib/topic_retriever.rb

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# frozen_string_literal: true
class TopicRetriever
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def initialize(embed_url, opts = nil)
@embed_url = embed_url
@opts = opts || {}
@author_username = @opts[:author_username]
end
def retrieve
perform_retrieve unless (invalid_url? || retrieved_recently?)
end
private
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def invalid_url?
!EmbeddableHost.url_allowed?(@embed_url)
end
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def retrieved_recently?
# We can disable the throttle for some users, such as staff
return false if @opts[:no_throttle]
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# Throttle other users to once every 60 seconds
retrieved_key = "retrieved_topic"
if Discourse.redis.setnx(retrieved_key, "1")
Discourse.redis.expire(retrieved_key, 60)
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return false
end
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true
end
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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?
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fetch_http
end
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def fetch_http
if @author_username.nil?
username = SiteSetting.embed_by_username.downcase
else
username = @author_username
end
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user = User.where(username_lower: username.downcase).first
return if user.blank?
TopicEmbed.import_remote(user, @embed_url)
end
end