Paperclip has unpleasant handling of SGV files, so it corrupts SVG XML file, and finally uploaded original file will have just header.
Temporary dirty solution is to replace original SVG file.
Lets assume we need to store jpg/png/gif/svg image, which can have thumbnail.
Model
class Image < ActiveRecord::Base
has_attached_file :file, styles: { thumb: {processors: [:image_thumb]}}
validates_attachment_content_type :file,
content_type: ["image/jpg", "image/jpeg", "image/png", "image/gif", "image/svg+xml"]
attr_accessor :tmp_stage_file_name
attr_accessor :tmp_stage_file_ext
before_post_process :save_staged_file
after_save :replace_original_file
def save_staged_file
if (path = file.staged_path)
if (file.content_type == 'image/svg+xml')
@tmp_stage_file_name = File.join("/tmp", SecureRandom.uuid)
@tmp_stage_file_ext = File.extname(path)
FileUtils.cp(path, File.join("/tmp", "#{tmp_stage_file_name}#{tmp_stage_file_ext}"))
end
end
end
def replace_original_file
if !file.blank? && !tmp_stage_file_name.blank?
path = File.join("/tmp", "#{tmp_stage_file_name}#{tmp_stage_file_ext}")
if File.exist? path
FileUtils.cp path, file.path
FileUtils.rm path, force: true
end
end
@tmp_stage_file_name = nil
@tmp_stage_file_ext = nil
end
end
Image Processor
lib/paperclip_processors/image_thumb.rb
module Paperclip
class ImageThumb < Processor
HEIGHT = 320
WIDTH = 320
def initialize file, options = {}, attachment = nil
super
@file = file
@instance = options[:instance]
@current_format = File.extname(@file.path)
@whiny = options[:whiny].nil? ? true : options[:whiny]
@basename = File.basename(file.path, File.extname(file.path))
@geometry = options[:geometry]
end
def make
geometry = Paperclip::Geometry.from_file(@file)
filename = [@basename, @current_format || ''].join
dst = TempfileFactory.new.generate(filename)
begin
cmd = file.content_type != 'image/svg+xml' ?
%Q(convert '#{file.path}' -resize '#{WIDTH}x#{HEIGHT}^' -gravity 'center' -crop '#{WIDTH}x#{HEIGHT}+0+0' +repage '#{dst.path}') :
%Q(rsvg-convert -a -w #{WIDTH} -h #{HEIGHT} -f svg '#{file.path}' -o '#{dst.path}')
Paperclip.run(cmd)
rescue
raise Paperclip::Error, "There was an error processing the thumbnail for #{@basename}" if @whiny
end
dst
end
end
end
