"""Various tools used by MIME-reading or MIME-writing programs."""


import os
import sys
import tempfile
from warnings import filterwarnings, catch_warnings
with catch_warnings():
if sys.py3kwarning:
filterwarnings("ignore", ".*rfc822 has been removed", DeprecationWarning)
import rfc822

from warnings import warnpy3k
warnpy3k("in 3.x, mimetools has been removed in favor of the email package",
stacklevel=2)

__all__ = ["Message","choose_boundary","encode","decode","copyliteral",
"copybinary"]

class Message(rfc822.Message):
"""A derived class of rfc822.Message that knows about MIME headers and
contains some hooks for decoding encoded and multipart messages."""

def __init__(self, fp, seekable = 1):
rfc822.Message.__init__(self, fp, seekable)
self.encodingheader = \
self.getheader('content-transfer-encoding')
self.typeheader = \
self.getheader('content-type')
self.parsetype()
self.parseplist()

def parsetype(self):
str = self.typeheader
if str is None:
str = 'text/plain'
if ';' in str:
i = str.index(';')
self.plisttext = str[i:]
str = str[:i]
else:
self.plisttext = ''
fields = str.split('/')
for i in range(len(fields)):
fields[i] = fields[i].strip().lower()
self.type = '/'.join(fields)
self.maintype = fields[0]
self.subtype = '/'.join(fields[1:])

def parseplist(self):
str = self.plisttext
self.plist = []
while str[:1] == ';':
str = str[1:]
if ';' in str:
# XXX Should parse quotes!
end = str.index(';')
else:
end = len(str)
f = str[:end]
if '=' in f:
i = f.index('=')
f = f[:i].strip().lower() + \
'=' + f[i+1:].strip()
self.plist.append(f.strip())
str = str[end:]

def getplist(self):
return self.plist

def getparam(self, name):
name = name.lower() + '='
n = len(name)
for p in self.plist:
if p[:n] == name:
return rfc822.unquote(p[n:])
return None

def getparamnames(self):
result = []
for p in self.plist:
i = p.find('=')
if i >= 0:
result.append(p[:i].lower())
return result

def getencoding(self):
if self.encodingheader is None:
return '7bit'
return self.encodingheader.lower()

def gettype(self):
return self.type

def getmaintype(self):
return self.maintype

def getsubtype(self):
return self.subtype




# Utility functions
# -----------------

try:
import thread
except ImportError:
import dummy_thread as thread
_counter_lock = thread.allocate_lock()
del thread

_counter = 0
def _get_next_counter():
global _counter
_counter_lock.acquire()
_counter += 1
result = _counter
_counter_lock.release()
return result

_prefix = None

def choose_boundary():
"""Return a string usable as a multipart boundary.

The string chosen is unique within a single program run, and
incorporates the user id (if available), process id (if available),
and current time. So it's very unlikely the returned string appears
in message text, but there's no guarantee.

The boundary contains dots so you have to quote it in the header."""

global _prefix
import time
if _prefix is None:
import socket
try:
hostid = socket.gethostbyname(socket.gethostname())
except socket.gaierror:
hostid = '127.0.0.1'
try:
uid = repr(os.getuid())
except AttributeError:
uid = '1'
try:
pid = repr(os.getpid())
except AttributeError:
pid = '1'
_prefix = hostid + '.' + uid + '.' + pid
return "%s.%.3f.%d" % (_prefix, time.time(), _get_next_counter())


# Subroutines for decoding some common content-transfer-types

def decode(input, output, encoding):
"""Decode common content-transfer-encodings (base64, quopri, uuencode)."""
if encoding == 'base64':
import base64
return base64.decode(input, output)
if encoding == 'quoted-printable':
import quopri
return quopri.decode(input, output)
if encoding in ('uuencode', 'x-uuencode', 'uue', 'x-uue'):
import uu
return uu.decode(input, output)
if encoding in ('7bit', '8bit'):
return output.write(input.read())
if encoding in decodetab:
pipethrough(input, decodetab[encoding], output)
else:
raise ValueError, \
'unknown Content-Transfer-Encoding: %s' % encoding

def encode(input, output, encoding):
"""Encode common content-transfer-encodings (base64, quopri, uuencode)."""
if encoding == 'base64':
import base64
return base64.encode(input, output)
if encoding == 'quoted-printable':
import quopri
return quopri.encode(input, output, 0)
if encoding in ('uuencode', 'x-uuencode', 'uue', 'x-uue'):
import uu
return uu.encode(input, output)
if encoding in ('7bit', '8bit'):
return output.write(input.read())
if encoding in encodetab:
pipethrough(input, encodetab[encoding], output)
else:
raise ValueError, \
'unknown Content-Transfer-Encoding: %s' % encoding

# The following is no longer used for standard encodings

# XXX This requires that uudecode and mmencode are in $PATH

uudecode_pipe = '''(
TEMP=/tmp/@uu.$$
sed "s%^begin [0-7][0-7]* .*%begin 600 $TEMP%" | uudecode
cat $TEMP
rm $TEMP
)'''

decodetab = {
'uuencode': uudecode_pipe,
'x-uuencode': uudecode_pipe,
'uue': uudecode_pipe,
'x-uue': uudecode_pipe,
'quoted-printable': 'mmencode -u -q',
'base64': 'mmencode -u -b',
}

encodetab = {
'x-uuencode': 'uuencode tempfile',
'uuencode': 'uuencode tempfile',
'x-uue': 'uuencode tempfile',
'uue': 'uuencode tempfile',
'quoted-printable': 'mmencode -q',
'base64': 'mmencode -b',
}

def pipeto(input, command):
pipe = os.popen(command, 'w')
copyliteral(input, pipe)
pipe.close()

def pipethrough(input, command, output):
(fd, tempname) = tempfile.mkstemp()
temp = os.fdopen(fd, 'w')
copyliteral(input, temp)
temp.close()
pipe = os.popen(command + ' <' + tempname, 'r')
copybinary(pipe, output)
pipe.close()
os.unlink(tempname)

def copyliteral(input, output):
while 1:
line = input.readline()
if not line: break
output.write(line)

def copybinary(input, output):
BUFSIZE = 8192
while 1:
line = input.read(BUFSIZE)
if not line: break
output.write(line)