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netrc.py5.4 KB · 140 lines
"""An object-oriented interface to .netrc files.""" # Module and documentation by Eric S. Raymond, 21 Dec 1998 import os, shlex, stat __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:            file = os.path.join(os.path.expanduser("~"), ".netrc")        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            saved_lineno = lexer.lineno            toplevel = tt = lexer.get_token()            if not tt:                break            elif tt[0] == '#':                if lexer.lineno == saved_lineno and len(tt) == 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():                            import pwd                            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 += f"machine {host}\n\tlogin {attrs[0]}\n"            if attrs[1]:                rep += f"\taccount {attrs[1]}\n"            rep += f"\tpassword {attrs[2]}\n"        for macro in self.macros.keys():            rep += f"macdef {macro}\n"            for line in self.macros[macro]:                rep += line            rep += "\n"        return rep if __name__ == '__main__':    print(netrc())