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#!/usr/bin/env ruby
require 'net/http'
require 'uri'
require 'nokogiri'
AESAN_HOST = 'https://www.aesan.gob.es'
AESAN_NEWS_URI = "#{AESAN_HOST}/AECOSAN/web/seguridad_alimentaria/subseccion/otras_alertas_alimentarias.htm"
READ_TITLES_FILE = './aesan_read.txt'
def read_title(file_path, line)
unless File.exist?(file_path)
File.open(file_path, 'w') {}
end
file_content = File.readlines(file_path).map(&:chomp)
if file_content.include?(line)
return false
else
File.open(file_path, 'a') do |file|
file.puts(line)
end
return true
end
end
def fetch_first_paragraph(url)
response = nil
error = nil
(1..3).each do
response = Net::HTTP.get_response(URI.parse(url))
break
rescue StandardError => error
sleep 5
end
if response.nil?
abort "Error al descargar URL tras 3 intentos: #{error}"
end
if response.is_a?(Net::HTTPSuccess)
document = Nokogiri::HTML(response.body)
ps = document.xpath('//section[@class="theContent"]/p/a').filter_map do |p|
title = p.text.gsub(/^\s+|\s+$/, '')
"* #{title} - #{AESAN_HOST}#{p['href']}" if read_title(READ_TITLES_FILE, title)
end
if ps.any?
if ps.length == 1
puts "Se ha publicado una nueva alerta alimentaria en AESAN:\n"
else
puts "Se han publicado una o más alertas alimentarias en AESAN:\n"
end
puts ps
end
else
abort "Error al descargar página: #{response.code} #{response.message}"
end
end
fetch_first_paragraph(AESAN_NEWS_URI)
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