Filter the Sport section out of the BBC News RSS feed and put the result into a Backblaze B2 bucket

bbc-news-rss-filter-sport-out.rb

#!/usr/bin/env ruby

# # Sample crontab:
# # At 41 minutes past each hour, run the script and log the results
# 41 * * * * ~/bbc-news-rss-filter-sport-out.rb > ~/bbc-news-rss-filter-sport-out.log 2>>&1

# Dependencies:
# * open-uri - load remote URL content easily
# * nokogiri - parse/filter XML
# * b2       - command line tools, described below
require 'bundler/inline'
gemfile do
  source 'https://rubygems.org'
  gem 'nokogiri'
end
require 'open-uri'

# Regular expression describing the GUIDs to reject from the resulting RSS feed
# We want to drop everything from the "sport" section of the website
REJECT_GUIDS_MATCHING = /^https:\/\/www\.bbc\.co\.uk\/sport\//

# Assumption: you're set up with a Backblaze B2 account with a bucket to which
# you'd like to upload the resulting RSS file, and you've configured the 'b2'
# command-line tool (https://www.backblaze.com/b2/docs/b2_authorize_account.html)
B2_BUCKET = 'YOUR-BUCKET-NAME-GOES-HERE'
B2_FILENAME = 'bbc-news-nosport.rss'

# Load and filter the original RSS
rss = Nokogiri::XML(open('https://feeds.bbci.co.uk/news/rss.xml?edition=uk'))
rss.css('item').select{|item| item.css('guid').text =~ REJECT_GUIDS_MATCHING }.each(&:unlink)

begin
  # Output resulting filtered RSS into a temporary file
  temp_file = Tempfile.new
  temp_file.write(rss.to_s)
  temp_file.close

  # Upload filtered RSS to a Backblaze B2 bucket
  result = `b2 upload_file --noProgress --contentType application/rss+xml #{B2_BUCKET} #{temp_file.path} #{B2_FILENAME}`
  puts Time.now
  puts result.split("\n").select{|line| line =~ /^URL by file name:/}.join("\n")
ensure
  # Tidy up after ourselves by ensuring we delete the temporary file
  temp_file.close
  temp_file.unlink
end