#!/usr/bin/env python
#
# Rick van der Zwet <rick@vanderzwet.net>
#
#
import argparse
import mimetypes
import os
import random
import re
import smtplib
import socket
import string
import sys
import textwrap
import time

from time import gmtime,strftime
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email.mime.text import MIMEText
from email.utils import COMMASPACE, formatdate
from email import encoders

__svnversion__ = "$Id: foomail.py 405 2020-06-03 11:53:43Z rick $"
__author__ = "Rick van der Zwet"


default_subject = strftime('Test email send at  %a, %d %b %Y %T %z', gmtime())

parser = argparse.ArgumentParser(
            description=textwrap.dedent('''
            Sent test emails for mailserver verification and debugging 

            Author : %s
            Version: %s 
            ''' % (__author__, __svnversion__)),
            formatter_class=argparse.RawDescriptionHelpFormatter)
parser.add_argument('--from', '-f', dest='sender', required=True)
parser.add_argument('--recipient', '-r', required=True)
parser.add_argument('--server', '-s', required=True)
parser.add_argument('--cc', help='Carbon Copy header')
parser.add_argument('--file', action='append', help='Attachments to sent')
parser.add_argument('--hostname', default=socket.gethostname(), help='EHLO/HELO hostname to present')
parser.add_argument('--message', help='Alternative message text of body')
parser.add_argument('--subject', default=default_subject, help='Alternative Subject header')
parser.add_argument('--spam', action='store_true', help='Include X-Spam testing headers')
parser.add_argument('--port', type=int, default=25, help='SMTP port used for connection')
parser.add_argument('--reply-to', help='Set Reply-To: header')
parser.add_argument('--to', help='Alternative To: header')
parser.add_argument('--silent', action='store_true', help='Do not-follow SMTP flow verbosely')
parser.add_argument('--virus', action='store_true', help='Include eicar.txt sample virus')
parser.add_argument('--dry-run', '-d', action='store_true', help='Do not actually sent out the message')
args = parser.parse_args()


email = MIMEMultipart()
email['From'] = 'Testing sender <' + args.sender + '>'
email['To'] = args.to or args.recipient
if args.cc:
    email['Cc'] = args.cc
email['X-Server'] = args.server
email['X-Port'] = str(args.port)
email['X-Hostname'] = args.hostname
email['Message-ID' ] = '<' +''.join(random.sample(string.ascii_letters +
                       string.digits,10)) + '@' + email['X-Hostname'] + '>'
email['Date'] = strftime('%a, %d %b %Y %T %z',gmtime())
email['Subject'] = args.subject
email['X-Version'] = __svnversion__
email['X-Author'] = __author__

tests = []
if args.spam:
    tests.append('spam')
if args.virus:
    test.append('virus')
email['X-Tests'] = ' '.join(tests)

if args.reply_to:
    email['Reply-To'] = args.reply_to

if args.spam:
    email['X-Spam'] = 'XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X'

if args.message:
    f = open(args.message,'r')
    msg = f.read()
    f.close()
else:
    msg = textwrap.dedent('''
        Hi,
        
            Sorry to bother you...
        
        Please ignore this message as it is used to test
        and verify systems to make sure everything works
        flawless.
        
        %(virus)s
        
        Technical details:\n''' % email)
    
    for k in list(email.keys()):
        v = email[k]
        msg += "* %-15s : %s\n" % (k,v)
    
    msg += textwrap.dedent('''
        Best regards,
        Your system administrator
        -- 
        BSD Licensed Source Code for this tool at: 
        https://rickvanderzwet.nl/svn/personal/foomailer
        ''')


email.attach(MIMEText(msg))

if args.virus:
    part = MIMEBase('application', "octet-stream")
    part.set_payload('X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*')
    encoders.encode_base64(part)
    part.add_header('Content-Disposition', 'attachment; filename="eicar.txt"')
    email.attach(part)

if args.file:
    for filename in args.file:
        mimetype = mimetypes.guess_type(filename)[0].split('/')
        part = MIMEBase(mimetype[0],mimetype[1])
        f = open(filename,'r')
        part.set_payload(f.read())
        f.close()
        encoders.encode_base64(part)
        part.add_header('Content-Disposition', 'attachment; filename="%s"' % os.path.basename(filename))
        email.attach(part)

print(email.as_string())

if not args.dry_run:
    mark = time.time()
    server = smtplib.SMTP(args.server, args.port, timeout=600)
    server.set_debuglevel(not args.silent)
    server.helo(args.hostname)
    server.ehlo(args.hostname)
    server.sendmail(args.sender, args.recipient, email.as_string())
    server.quit()
    print("Sending took sec: %.2f" % (time.time() - mark))