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mastodon/app/lib/provider_discovery.rb
Akihiko Odaki 40e5d2303b Validate HTTP response length while receiving (#6891)
to_s method of HTTP::Response keeps blocking while it receives the whole
content, no matter how it is big. This means it may waste time to receive
unacceptably large files. It may also consume memory and disk in the
process. This solves the inefficency by checking response length while
receiving.
2018-03-26 14:02:10 +02:00

48 lines
1.4 KiB
Ruby

# frozen_string_literal: true
class ProviderDiscovery < OEmbed::ProviderDiscovery
class << self
def get(url, **options)
provider = discover_provider(url, options)
options.delete(:html)
provider.get(url, options)
end
def discover_provider(url, **options)
format = options[:format]
html = if options[:html]
Nokogiri::HTML(options[:html])
else
Request.new(:get, url).perform do |res|
raise OEmbed::NotFound, url if res.code != 200 || res.mime_type != 'text/html'
Nokogiri::HTML(res.body_with_limit)
end
end
if format.nil? || format == :json
provider_endpoint ||= html.at_xpath('//link[@type="application/json+oembed"]')&.attribute('href')&.value
format ||= :json if provider_endpoint
end
if format.nil? || format == :xml
provider_endpoint ||= html.at_xpath('//link[@type="text/xml+oembed"]')&.attribute('href')&.value
format ||= :xml if provider_endpoint
end
raise OEmbed::NotFound, url if provider_endpoint.nil?
begin
provider_endpoint = Addressable::URI.parse(provider_endpoint)
provider_endpoint.query = nil
provider_endpoint = provider_endpoint.to_s
rescue Addressable::URI::InvalidURIError
raise OEmbed::NotFound, url
end
OEmbed::Provider.new(provider_endpoint, format)
end
end
end