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require 'open-uri'
class Downloader
def self.download(url, name, dir = nil)
data = URI(url).read
file = dir ? File.join(dir, name) : name
open(file, "wb", 0755) {|f| f.write(data)}
rescue => e
raise "failed to download #{name}\n#{e.message}: #{url}"
end
end
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