Track Zach Gage's Scarcity. Run this every day or you risk losing it forever.

scarcity.rb

require 'date'
require 'digest'
require 'net/http'

ledger = (DATA || '').each_line.map { |l| l.strip.split(' ') }.to_h

def url_for(token)
  "http://stfj.net/scarcity/#{token}"
end

def calculate_token(ledger, last_modified = nil)
  keys = ledger.keys.sort.map { |k| ledger[k][0, 1] }
  last_modified ||= Date.parse(ledger.keys.max)
  Digest::MD5.hexdigest(keys.join('') + last_modified.strftime('%m%d%Y'))
end

def valid_token?(token)
  response = Net::HTTP.get_response(URI(url_for(token)))

  response.is_a?(Net::HTTPSuccess) &&
    response.body =~ /<title>\s*scarcity\s*<\/title>/i
end

if valid_token?(calculate_token(ledger))
  STDERR.puts('The work has not moved')
  exit
end

last_modified = Date.new(2021, 3, 8) # Date.today
token = calculate_token(ledger, last_modified)

if valid_token?(token)
  file = File.open(__FILE__, 'a')
  file.puts("#{last_modified} #{token}")
  STDERR.puts('The work has moved')
  exit
else
  STDERR.puts('Could not calculate the new location')
  exit 1
end

__END__
2021-03-08 cd8ab6ab905103b5e3c2b68da30732e4