discourse/lib/topic_retriever.rb

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# frozen_string_literal: true
class TopicRetriever
def initialize(embed_url, opts = nil)
@embed_url = embed_url
@opts = opts || {}
end
def retrieve
perform_retrieve unless (invalid_url? || retrieved_recently?)
end
private
def invalid_url?
!EmbeddableHost.url_allowed?(@embed_url.strip)
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_topic"
if Discourse.redis.setnx(retrieved_key, "1")
Discourse.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?
if @opts[:author_username].present?
Discourse.deprecate(
"discourse_username parameter has been deprecated. Prefer passing author name using a <meta> tag.",
since: "3.1.0.beta1",
drop_from: "3.2",
)
end
username =
@opts[:author_username].presence || SiteSetting.embed_by_username.presence ||
SiteSetting.site_contact_username.presence || Discourse.system_user.username
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TopicEmbed.import_remote(@embed_url, user: User.find_by(username_lower: username.downcase))
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end
end