smtp to www gateway. Tested with Postfix. Inspired by rms.

www-smtp-gateway.rb

#!/usr/bin/ruby
#
# smtp to www gateway. Tested with Postfix. Inspired by rms.
#
# Pipe to this command from your .forward file (or in my case, an alias extension, 
# so .forward-webgateway).  For every http or https url found in the message 
# (headers and body), it will send an email back to you with the output of a text 
# web browser visiting.
#
# * Requires elinks and the mail command
# * Won't read messages larger than 32k (to make DoS slightly harder, but not much)
# * Is careful not to let command injection attack, though needs more testing on this
#
# Not really designed for safe public (read: untrusted) use, so try to keep your
# gateway email address to yourself!

input = STDIN.read(32 * 1024)
re = Regexp.new('(https?://[^\s$]+)', Regexp::EXTENDED)
input.scan(re).each do |url|
  url = url.first.gsub("'", '\\''')
  system("/usr/bin/elinks -dump 1 '#{url}' | /usr/bin/mail -s '#{url}' '#{ENV['SENDER']}'")
end