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# frozen_string_literal: true
module Remotable
extend ActiveSupport::Concern
class_methods do
def remotable_attachment(attachment_name, limit, suppress_errors: true, download_on_assign: true, attribute_name: nil)
attribute_name ||= "#{attachment_name}_remote_url".to_sym
define_method("download_#{attachment_name}!") do
url = self[attribute_name]
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.blank?
begin
Request.new(:get, url).perform do |response|
raise Mastodon::UnexpectedResponseError, response unless (200...300).cover?(response.code)
content_type = parse_content_type(response.headers.get('content-type').last)
extname = detect_extname_from_content_type(content_type)
if extname.nil?
disposition = response.headers.get('content-disposition').last
matches = disposition&.match(/filename="([^"]*)"/)
filename = matches.nil? ? parsed_url.path.split('/').last : matches[1]
extname = filename.nil? ? '' : File.extname(filename)
end
basename = SecureRandom.hex(8)
public_send("#{attachment_name}_file_name=", basename + extname)
public_send("#{attachment_name}=", StringIO.new(response.body_with_limit(limit)))
end
rescue Mastodon::UnexpectedResponseError, HTTP::TimeoutError, HTTP::ConnectionError, OpenSSL::SSL::SSLError => e
Rails.logger.debug "Error fetching remote #{attachment_name}: #{e}"
raise e unless suppress_errors
rescue Paperclip::Errors::NotIdentifiedByImageMagickError, Addressable::URI::InvalidURIError, Mastodon::HostValidationError, Mastodon::LengthValidationError, Paperclip::Error, Mastodon::DimensionsValidationError => e
Rails.logger.debug "Error fetching remote #{attachment_name}: #{e}"
nil
end
end
define_method("#{attribute_name}=") do |url|
return if self[attribute_name] == url && public_send("#{attachment_name}_file_name").present?
self[attribute_name] = url
public_send("download_#{attachment_name}!") if download_on_assign
end
alias_method("reset_#{attachment_name}!", "download_#{attachment_name}!")
end
end
private
def detect_extname_from_content_type(content_type)
return if content_type.nil?
type = MIME::Types[content_type].first
return if type.nil?
extname = type.extensions.first
return if extname.nil?
".#{extname}"
end
def parse_content_type(content_type)
return if content_type.nil?
content_type.split(/\s*;\s*/).first
end
end
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