139 lines
5.4 KiB
Python
139 lines
5.4 KiB
Python
"""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, shlex, stat
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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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file = os.path.join(os.path.expanduser("~"), ".netrc")
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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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saved_lineno = lexer.lineno
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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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if lexer.lineno == saved_lineno and len(tt) == 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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import pwd
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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 += f"machine {host}\n\tlogin {attrs[0]}\n"
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if attrs[1]:
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rep += f"\taccount {attrs[1]}\n"
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rep += f"\tpassword {attrs[2]}\n"
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for macro in self.macros.keys():
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rep += f"macdef {macro}\n"
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for line in self.macros[macro]:
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rep += line
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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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