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