"""An object-oriented interface to .netrc files."""

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# Module and documentation by Eric S. Raymond, 21 Dec 1998

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import os, stat, shlex

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if os.name == 'posix':

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import pwd

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__all__ = ["netrc", "NetrcParseError"]

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class NetrcParseError(Exception):

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"""Exception raised on syntax errors in the .netrc file."""

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def __init__(self, msg, filename=None, lineno=None):

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self.filename = filename

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self.lineno = lineno

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self.msg = msg

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Exception.__init__(self, msg)

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def __str__(self):

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return "%s (%s, line %s)" % (self.msg, self.filename, self.lineno)

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class netrc:

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def __init__(self, file=None):

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default_netrc = file is None

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if file is None:

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try:

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file = os.path.join(os.environ['HOME'], ".netrc")

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except KeyError:

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raise IOError("Could not find .netrc: $HOME is not set")

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self.hosts = {}

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self.macros = {}

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with open(file) as fp:

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self._parse(file, fp, default_netrc)

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def _parse(self, file, fp, default_netrc):

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lexer = shlex.shlex(fp)

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lexer.wordchars += r"""!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~"""

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lexer.commenters = lexer.commenters.replace('#', '')

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while 1:

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# Look for a machine, default, or macdef top-level keyword

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toplevel = tt = lexer.get_token()

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if not tt:

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break

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elif tt[0] == '#':

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# seek to beginning of comment, in case reading the token put

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# us on a new line, and then skip the rest of the line.

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pos = len(tt) + 1

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lexer.instream.seek(-pos, 1)

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lexer.instream.readline()

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continue

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elif tt == 'machine':

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entryname = lexer.get_token()

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elif tt == 'default':

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entryname = 'default'

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elif tt == 'macdef': # Just skip to end of macdefs

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entryname = lexer.get_token()

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self.macros[entryname] = []

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lexer.whitespace = ' \t'

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while 1:

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line = lexer.instream.readline()

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if not line or line == '\012':

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lexer.whitespace = ' \t\r\n'

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break

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self.macros[entryname].append(line)

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continue

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else:

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raise NetrcParseError(

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"bad toplevel token %r" % tt, file, lexer.lineno)

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# We're looking at start of an entry for a named machine or default.

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login = ''

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account = password = None

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self.hosts[entryname] = {}

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while 1:

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tt = lexer.get_token()

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if (tt.startswith('#') or

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tt in {'', 'machine', 'default', 'macdef'}):

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if password:

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self.hosts[entryname] = (login, account, password)

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lexer.push_token(tt)

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break

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else:

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raise NetrcParseError(

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"malformed %s entry %s terminated by %s"

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% (toplevel, entryname, repr(tt)),

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file, lexer.lineno)

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elif tt == 'login' or tt == 'user':

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login = lexer.get_token()

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elif tt == 'account':

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account = lexer.get_token()

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elif tt == 'password':

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if os.name == 'posix' and default_netrc:

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prop = os.fstat(fp.fileno())

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if prop.st_uid != os.getuid():

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try:

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fowner = pwd.getpwuid(prop.st_uid)[0]

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except KeyError:

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fowner = 'uid %s' % prop.st_uid

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try:

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user = pwd.getpwuid(os.getuid())[0]

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except KeyError:

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user = 'uid %s' % os.getuid()

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raise NetrcParseError(

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("~/.netrc file owner (%s) does not match"

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" current user (%s)") % (fowner, user),

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file, lexer.lineno)

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if (prop.st_mode & (stat.S_IRWXG | stat.S_IRWXO)):

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raise NetrcParseError(

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"~/.netrc access too permissive: access"

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" permissions must restrict access to only"

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" the owner", file, lexer.lineno)

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password = lexer.get_token()

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else:

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raise NetrcParseError("bad follower token %r" % tt,

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file, lexer.lineno)

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def authenticators(self, host):

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"""Return a (user, account, password) tuple for given host."""

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if host in self.hosts:

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return self.hosts[host]

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elif 'default' in self.hosts:

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return self.hosts['default']

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else:

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return None

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def __repr__(self):

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"""Dump the class data in the format of a .netrc file."""

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rep = ""

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for host in self.hosts.keys():

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attrs = self.hosts[host]

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rep = rep + "machine "+ host + "\n\tlogin " + repr(attrs[0]) + "\n"

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if attrs[1]:

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rep = rep + "account " + repr(attrs[1])

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rep = rep + "\tpassword " + repr(attrs[2]) + "\n"

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for macro in self.macros.keys():

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rep = rep + "macdef " + macro + "\n"

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for line in self.macros[macro]:

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rep = rep + line

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rep = rep + "\n"

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return rep

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if __name__ == '__main__':

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print netrc()

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