discourse/lib/file_helper.rb

62 lines
1.4 KiB
Ruby

require "final_destination"
require "mini_mime"
require "open-uri"
class FileHelper
def self.is_image?(filename)
filename =~ images_regexp
end
def self.download(url,
max_file_size:,
tmp_file_name:,
follow_redirect: false,
read_timeout: 5,
skip_rate_limit: false)
url = "https:" + url if url.start_with?("//")
raise Discourse::InvalidParameters.new(:url) unless url =~ /^https?:\/\//
uri = FinalDestination.new(
url,
max_redirects: follow_redirect ? 5 : 1,
skip_rate_limit: skip_rate_limit
).resolve
return unless uri.present?
downloaded = uri.open("rb", read_timeout: read_timeout)
extension = File.extname(uri.path)
if extension.blank? && downloaded.content_type.present?
ext = MiniMime.lookup_by_content_type(downloaded.content_type)&.extension
ext = "jpg" if ext == "jpe"
extension = "." + ext if ext.present?
end
tmp = Tempfile.new([tmp_file_name, extension])
File.open(tmp.path, "wb") do |f|
while f.size <= max_file_size && data = downloaded.read(512.kilobytes)
f.write(data)
end
end
tmp
ensure
downloaded&.close! rescue nil
end
private
def self.images
@@images ||= Set.new %w{jpg jpeg png gif tif tiff bmp svg webp ico}
end
def self.images_regexp
@@images_regexp ||= /\.(#{images.to_a.join("|")})$/i
end
end