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# 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.blank? || self[attribute_name] == url
begin
Request.new(:get, url).perform do |response|
next if response.code != 200
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)
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, Mastodon::LengthValidationError => e
Rails.logger.debug "Error fetching remote #{attachment_name}: #{e}"
nil
rescue Paperclip::Error, Mastodon::DimensionsValidationError => e
Rails.logger.debug "Error processing 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
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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