A simple and easy script to convert to/from open vpn's embedded format (ovpn)

tofromovpn.py

#!/bin/python

import argparse
import re

parser = argparse.ArgumentParser(description='Convert to and from ovpn files')
parser.add_argument('file', type=str, help='the .config or the .ovpn')
args = parser.parse_args()

m = re.match(r'(.*)\.(ovpn|conf)', args.file)
if not m:
  print('File must be either .ovpn or .con')
  exit()

r = open(args.file, 'r')

fname, fext = m.groups()

if fext == 'conf':
  f = re.compile(r'(ca|cert|key|tls-auth) ([^ \n]*|"[^\n]")( \d)?( *(#.*)?)')
  w = open('%s.ovpn' % (fname), 'w')
  for l in r.readlines():
    m = f.match(l)
    if not m:
      w.write(l)
    else:
      t = m.group(1)
      fn = m.group(2)
      if t == 'tls-auth':
        d = m.group(3)
        w.write('key-direction %s\n' % (d))
      c = m.group(4) or ''
      rr = open(fn, 'r')
      w.write('<%s>%s\n%s</%s>\n' % (t, c, ''.join(rr.readlines()), t))
      rr.close()
  w.close()
elif fext == 'ovpn':
  nname = {
    'ca': 'ca.crt',
    'cert': '%s.crt' % (fname),
    'key': '%s.key' % (fname),
    'tls-auth': 'ta.key'
  }
  f = re.compile(r'</?(ca|cert|key|tls-auth)>( *(#.*)?)')
  fk = re.compile(r'key-direction (\d) *(#.*)?')
  tt, td, tc = None, None, None
  kt, kc, kw = None, None, None
  w = open('%s.conf' % (fname), 'w')
  for l in r.readlines():
    m = f.match(l)
    if not m: # cert definition?
      if kt:  # writing a cert?
        kw.write(l)
      else: # writing config
        m = fk.match(l)
        if m: # key-direction?
          td = m.group(1) # save
        else: # writing conf
          w.write(l)
    else: # cert definition.
      if kt: # writing a cert--flush
        if t == 'tls-auth':
          tt, tc = kt, kc
        else:
          w.write('%s %s%s\n' % (kt, nname[t], kc))
        kw.close()
        kt, kc = None, None
      else: # starting net cert definition
        t = m.group(1)
        c = m.group(2) or ''
        kt, kc = t, c
        kw = open(nname[t], 'w')
  if tt: # write tls-auth definition
    w.write('%s %s %s%s\n' % (tt, nname[tt], td or '', tc))
  w.close()