discourse/lib/file_helper.rb

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Ruby
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require "open-uri"
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class FileHelper
def self.is_image?(filename)
filename =~ images_regexp
end
def self.download(url, max_file_size, tmp_file_name)
raise Discourse::InvalidParameters.new(:url) unless url =~ /^https?:\/\//
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uri = URI.parse(url)
extension = File.extname(uri.path)
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tmp = Tempfile.new([tmp_file_name, extension])
File.open(tmp.path, "wb") do |f|
downloaded = uri.open("rb", read_timeout: 5)
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while f.size <= max_file_size && data = downloaded.read(max_file_size)
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f.write(data)
end
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downloaded.close!
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end
tmp
end
private
def self.images
@@images ||= Set.new ["jpg", "jpeg", "png", "gif", "tif", "tiff", "bmp"]
end
def self.images_regexp
@@images_regexp ||= /\.(#{images.to_a.join("|")})$/i
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end
end