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