62 lines
1.4 KiB
Ruby
62 lines
1.4 KiB
Ruby
require "final_destination"
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require "mini_mime"
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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,
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max_file_size:,
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tmp_file_name:,
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follow_redirect: false,
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read_timeout: 5,
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skip_rate_limit: false)
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url = "https:" + url if url.start_with?("//")
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raise Discourse::InvalidParameters.new(:url) unless url =~ /^https?:\/\//
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uri = FinalDestination.new(
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url,
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max_redirects: follow_redirect ? 5 : 1,
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skip_rate_limit: skip_rate_limit
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).resolve
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return unless uri.present?
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downloaded = uri.open("rb", read_timeout: read_timeout)
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extension = File.extname(uri.path)
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if extension.blank? && downloaded.content_type.present?
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ext = MiniMime.lookup_by_content_type(downloaded.content_type)&.extension
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ext = "jpg" if ext == "jpe"
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extension = "." + ext if ext.present?
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end
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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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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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end
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tmp
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ensure
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downloaded&.close! rescue nil
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end
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private
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def self.images
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@@images ||= Set.new %w{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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end
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