JezK
Edit File: netrc.py
"""An object-oriented interface to .netrc files.""" # Module and documentation by Eric S. Raymond, 21 Dec 1998 import os, stat, shlex if os.name == 'posix': import pwd __all__ = ["netrc", "NetrcParseError"] class NetrcParseError(Exception): """Exception raised on syntax errors in the .netrc file.""" def __init__(self, msg, filename=None, lineno=None): self.filename = filename self.lineno = lineno self.msg = msg Exception.__init__(self, msg) def __str__(self): return "%s (%s, line %s)" % (self.msg, self.filename, self.lineno) class netrc: def __init__(self, file=None): default_netrc = file is None if file is None: try: file = os.path.join(os.environ['HOME'], ".netrc") except KeyError: raise IOError("Could not find .netrc: $HOME is not set") self.hosts = {} self.macros = {} with open(file) as fp: self._parse(file, fp, default_netrc) def _parse(self, file, fp, default_netrc): lexer = shlex.shlex(fp) lexer.wordchars += r"""!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~""" lexer.commenters = lexer.commenters.replace('#', '') while 1: # Look for a machine, default, or macdef top-level keyword toplevel = tt = lexer.get_token() if not tt: break elif tt[0] == '#': # seek to beginning of comment, in case reading the token put # us on a new line, and then skip the rest of the line. pos = len(tt) + 1 lexer.instream.seek(-pos, 1) lexer.instream.readline() continue elif tt == 'machine': entryname = lexer.get_token() elif tt == 'default': entryname = 'default' elif tt == 'macdef': # Just skip to end of macdefs entryname = lexer.get_token() self.macros[entryname] = [] lexer.whitespace = ' \t' while 1: line = lexer.instream.readline() if not line or line == '\012': lexer.whitespace = ' \t\r\n' break self.macros[entryname].append(line) continue else: raise NetrcParseError( "bad toplevel token %r" % tt, file, lexer.lineno) # We're looking at start of an entry for a named machine or default. login = '' account = password = None self.hosts[entryname] = {} while 1: tt = lexer.get_token() if (tt.startswith('#') or tt in {'', 'machine', 'default', 'macdef'}): if password: self.hosts[entryname] = (login, account, password) lexer.push_token(tt) break else: raise NetrcParseError( "malformed %s entry %s terminated by %s" % (toplevel, entryname, repr(tt)), file, lexer.lineno) elif tt == 'login' or tt == 'user': login = lexer.get_token() elif tt == 'account': account = lexer.get_token() elif tt == 'password': if os.name == 'posix' and default_netrc: prop = os.fstat(fp.fileno()) if prop.st_uid != os.getuid(): try: fowner = pwd.getpwuid(prop.st_uid)[0] except KeyError: fowner = 'uid %s' % prop.st_uid try: user = pwd.getpwuid(os.getuid())[0] except KeyError: user = 'uid %s' % os.getuid() raise NetrcParseError( ("~/.netrc file owner (%s) does not match" " current user (%s)") % (fowner, user), file, lexer.lineno) if (prop.st_mode & (stat.S_IRWXG | stat.S_IRWXO)): raise NetrcParseError( "~/.netrc access too permissive: access" " permissions must restrict access to only" " the owner", file, lexer.lineno) password = lexer.get_token() else: raise NetrcParseError("bad follower token %r" % tt, file, lexer.lineno) def authenticators(self, host): """Return a (user, account, password) tuple for given host.""" if host in self.hosts: return self.hosts[host] elif 'default' in self.hosts: return self.hosts['default'] else: return None def __repr__(self): """Dump the class data in the format of a .netrc file.""" rep = "" for host in self.hosts.keys(): attrs = self.hosts[host] rep += "machine {host}\n\tlogin {attrs[0]}\n".format(host=host, attrs=attrs) if attrs[1]: rep += "\taccount {attrs[1]}\n".format(attrs=attrs) rep += "\tpassword {attrs[2]}\n".format(attrs=attrs) for macro in self.macros.keys(): rep += "macdef {macro}\n".format(macro=macro) for line in self.macros[macro]: rep += line rep += "\n" return rep if __name__ == '__main__': print netrc()