silly little file for reading postfix files on a dev server.

read_email.py

import argparse
import os
import subprocess

"""
$ mailq
	show mail queue contents

$ sudo postcat -q {queue_id}
	show message details

http://manpages.ubuntu.com/manpages/lucid/man1/postcat.1.html

reading email on dev is a pain because of the encoding.

this will reformat the email to human readable:

$ sudo python read_email.py -q {queue_id}

you can also specify a text file (-f) if you have the email as a file.

IMPORTANT make sure you do this with permissions.  otherwise `postcat` can't read the file and their error message isn't great

"""


def clean_message(text):
    # process this in order
    _map = [('=\n', ''),
            ('=09', '\t'),
            ('=3D', '='),
            ('=20', ' '),
            ]
    for (a, b) in _map:
        text = text.replace(a, b)
    return text
    
    

def parse_args():
    parser = argparse.ArgumentParser(description='make file readable')
    parser.add_argument('-f',
                        '--filename',
                        type = str,
                        help = 'Which file for action?'
                        )
    parser.add_argument('-q',
                        '--queue_id',
                        type = str,
                        help = 'What queue id file for action?'
                        )
    args = parser.parse_args()
    print args
    
    if not args.filename and not args.queue_id:
        raise ValueError("Missing filename or queue_id")
        
    if args.filename:
        fname = args.filename
        if not os.path.exists(fname):
            raise ValueError("Invalid filename: `%s`" % fname)
        try:
            text = open(fname, 'r').read().strip()
            text = clean_message(text)
            print "*" * 100
            print text
            print "*" * 100
        except:
            raise

    if args.queue_id:
        queue_id = args.queue_id
        proc = subprocess.Popen(["postcat", "-q", queue_id], stdout=subprocess.PIPE)
        (out, err) = proc.communicate()
        if err:
            raise ValueError("Error communicating... %s" % err)
        output_clean = clean_message(out)
        print "*" * 100
        print output_clean
        print "*" * 100



if __name__ == '__main__':
    parse_args()