discourse/lib/inline_oneboxer.rb

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# frozen_string_literal: true
class InlineOneboxer
MIN_TITLE_LENGTH = 2
def initialize(urls, opts = nil)
@urls = urls
@opts = opts || {}
end
def process
@urls.map { |url| InlineOneboxer.lookup(url, @opts) }.compact
end
def self.invalidate(url)
Discourse.cache.delete(cache_key(url))
end
def self.cache_lookup(url)
Discourse.cache.read(cache_key(url))
end
def self.lookup(url, opts = nil)
opts ||= {}
opts = opts.with_indifferent_access
unless opts[:skip_cache] || opts[:invalidate]
cached = cache_lookup(url)
return cached if cached.present?
end
return unless url
if route = Discourse.route_for(url)
if route[:controller] == "topics"
if topic = Oneboxer.local_topic(url, route, opts)
opts[:skip_cache] = true
post_number = [route[:post_number].to_i, topic.highest_post_number].min
if post_number > 1
opts[:post_number] = post_number
opts[:post_author] = post_author_for_title(topic, post_number)
end
return onebox_for(url, topic.title, opts)
else
# not permitted to see topic
return nil
end
end
end
always_allow = SiteSetting.enable_inline_onebox_on_all_domains
domains = SiteSetting.allowed_inline_onebox_domains&.split('|') unless always_allow
if always_allow || domains
uri = begin
URI(url)
rescue URI::Error
end
if uri.present? &&
uri.hostname.present? &&
(always_allow || domains.include?(uri.hostname))
title = RetrieveTitle.crawl(url)
title = nil if title && title.length < MIN_TITLE_LENGTH
return onebox_for(url, title, opts)
end
end
nil
end
private
def self.onebox_for(url, title, opts)
title = title && Emoji.gsub_emoji_to_unicode(title)
if title && opts[:post_number]
title += " - "
if opts[:post_author]
title += I18n.t(
"inline_oneboxer.topic_page_title_post_number_by_user",
post_number: opts[:post_number],
username: opts[:post_author]
)
else
title += I18n.t(
"inline_oneboxer.topic_page_title_post_number",
post_number: opts[:post_number]
)
end
end
onebox = { url: url, title: title && Emoji.gsub_emoji_to_unicode(title) }
Discourse.cache.write(cache_key(url), onebox, expires_in: 1.day) if !opts[:skip_cache]
2018-06-07 13:28:18 +08:00
onebox
end
def self.cache_key(url)
"inline_onebox:#{url}"
end
def self.post_author_for_title(topic, post_number)
guardian = Guardian.new
post = topic.posts.find_by(post_number: post_number)
author = post&.user
if author && guardian.can_see_post?(post) && post.post_type == Post.types[:regular]
author.username
end
end
end