mastodon/app/models/concerns/remotable.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

58 lines
1.9 KiB
Ruby

# frozen_string_literal: true
module Remotable
extend ActiveSupport::Concern
class_methods do
def remotable_attachment(attachment_name, limit)
attribute_name = "#{attachment_name}_remote_url".to_sym
method_name = "#{attribute_name}=".to_sym
alt_method_name = "reset_#{attachment_name}!".to_sym
define_method method_name do |url|
return if url.blank?
begin
parsed_url = Addressable::URI.parse(url).normalize
rescue Addressable::URI::InvalidURIError
return
end
return if !%w(http https).include?(parsed_url.scheme) || parsed_url.host.empty? || self[attribute_name] == url
begin
Request.new(:get, url).perform do |response|
next if response.code != 200
matches = response.headers['content-disposition']&.match(/filename="([^"]*)"/)
filename = matches.nil? ? parsed_url.path.split('/').last : matches[1]
basename = SecureRandom.hex(8)
extname = if filename.nil?
''
else
File.extname(filename)
end
send("#{attachment_name}=", StringIO.new(response.body_with_limit(limit)))
send("#{attachment_name}_file_name=", basename + extname)
self[attribute_name] = url if has_attribute?(attribute_name)
end
rescue HTTP::TimeoutError, HTTP::ConnectionError, OpenSSL::SSL::SSLError, Paperclip::Errors::NotIdentifiedByImageMagickError, Addressable::URI::InvalidURIError, Mastodon::HostValidationError => e
Rails.logger.debug "Error fetching remote #{attachment_name}: #{e}"
nil
end
end
define_method alt_method_name do
url = self[attribute_name]
return if url.blank?
self[attribute_name] = ''
send(method_name, url)
end
end
end
end