metamaps--metamaps/app/controllers/hacks_controller.rb

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# frozen_string_literal: true
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# bad code that should be checked over before entering one of the
# nice files from the right side of this repo
class HacksController < ApplicationController
include ActionView::Helpers::TextHelper # string truncate method
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# rate limited by rack-attack - currently 5r/s
def load_url_title
authorize :Hack
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url = params[:url]
response, url = get_with_redirects(url)
title = get_encoded_title(response)
render json: { success: true, title: title, url: url }
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rescue StandardError
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render json: { success: false }
end
private
def get_with_redirects(url)
uri = URI.parse(url)
response = Net::HTTP.get_response(uri)
while response.code == '301'
uri = URI.parse(response['location'])
response = Net::HTTP.get_response(uri)
end
[response, uri.to_s]
end
def get_encoded_title(http_response)
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# ensure there's actually an html title tag
title = http_response.body.sub(%r{.*(<title>.*</title>).*}m, '\1')
return '' unless title.starts_with?('<title>')
return '' unless title.ends_with?('</title>')
title = title.sub('<title>', '').sub(%r{</title>$}, '')
# encode and trim the title to 140 usable characters
charset = http_response['content-type'].sub(/.*charset=(.*);?.*/, '\1')
charset = nil if charset == 'text/html'
title = title.force_encoding(charset) if charset
truncate(title, length: 140)
end
end