50 lines
1.3 KiB
Ruby
50 lines
1.3 KiB
Ruby
require "open-uri"
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class FileHelper
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def self.is_image?(filename)
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filename =~ images_regexp
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end
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def self.download(url, max_file_size, tmp_file_name, follow_redirect=false, read_timeout=5)
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raise Discourse::InvalidParameters.new(:url) unless url =~ /^https?:\/\//
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uri = parse_url(url)
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extension = File.extname(uri.path)
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tmp = Tempfile.new([tmp_file_name, extension])
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File.open(tmp.path, "wb") do |f|
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downloaded = uri.open("rb", read_timeout: read_timeout, redirect: follow_redirect, allow_redirections: :all)
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while f.size <= max_file_size && data = downloaded.read(512.kilobytes)
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f.write(data)
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end
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# tiny files are StringIO, no close! on them
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downloaded.try(:close!) rescue nil
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end
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tmp
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end
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private
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def self.images
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@@images ||= Set.new ["jpg", "jpeg", "png", "gif", "tif", "tiff", "bmp", "svg", "webp", "ico"]
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end
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def self.images_regexp
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@@images_regexp ||= /\.(#{images.to_a.join("|")})$/i
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end
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# HACK to support underscores in URLs
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# cf. http://stackoverflow.com/a/18938253/11983
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def self.parse_url(url)
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URI.parse(url)
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rescue URI::InvalidURIError
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host = url.match(".+\:\/\/([^\/]+)")[1]
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uri = URI.parse(url.sub(host, 'valid-host'))
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uri.instance_variable_set("@host", host)
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uri
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end
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end
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