[hashcash] Python hashcash minting script for Mutt
- From: Aaron Toponce <aaron.toponce@xxxxxxxxx>
- To: hashcash@xxxxxxxxxxxxx
- Date: Thu, 24 Mar 2011 17:27:58 -0600
I have finalized my Python minting script for Mutt. I haven't written a
verification script yet, although that should be trivial with
$display_filter. That's next.
Anyway, the script is attached. If you wish to give it a go, here is what
you'll need to do to set it up:
Set the following varibles in your ~/.muttrc:
set editor="/path/to/mint_hashcash.py" # required
set edit_headers="yes" # required
set askcc="yes" # recommended
The Python script calls Vim on line 10 of the script. Feel free to replace
it with your favorite editor.
A couple notes about the logic:
* Python 2.5 or later is required.
* It uses formatting of version 1 of the protocol only.
* It only mints new tokens after exiting your editor. If you add
additional emails, you will need to re-edit the mail, then quit to
mint the new tokens.
* Already existing tokens are left in place without duplicates minted.
* Both "X-Hashcash" and "Hashcash" headers are supported.
* 20 bits is minted, and compression level 2 is used.
If you use it, and find any bugs, please let me know. I've been using it
all day, and I've been trying to break it, but haven't found anything yet.
--
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#!/usr/bin/env python
import csv
import fileinput
import re
import rfc822
import subprocess
import sys
subprocess.call("vim %s" % sys.argv[1], shell=True)
file = open(sys.argv[1], 'r')
headers = rfc822.Message(file)
from_email = headers.getaddrlist("From")
to_emails = headers.getaddrlist("To")
cc_emails = headers.getaddrlist("Cc")
bcc_emails = headers.getaddrlist("Bcc")
email_addrs = []
tokens = []
# Harvest all email addresses from the header
for email in to_emails:
email_addrs.append(email[1])
for email in cc_emails:
email_addrs.append(email[1])
# Remove duplicate emails from the list, requires Python 2.5 and later
email_addrs = list(set(email_addrs))
# Check if an appropriate token is already generated for the mail
if headers.has_key("X-Hashcash"):
for list in headers.getheaders("X-Hashcash"):
email_addrs.remove(list.split(":")[3])
if headers.has_key("Hashcash"):
for list in headers.getheaders("Hashcash"):
email_addrs.remove(list.split(":")[3])
# Call the hashcash function from the operating system to mint tokens
for email in email_addrs:
t = subprocess.Popen("hashcash -m %s -X -Z 2" % email, shell=True,
stdout=subprocess.PIPE)
tokens.append(t.stdout.read())
f = fileinput.FileInput(sys.argv[1], inplace=1)
for line in f:
line = line.strip()
if f.lineno() == 7:
for token in tokens:
print token,
print line
continue
else:
print line
file.close()
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