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