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Edit File : netrc.py \| Size : 5.44 KB
"""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()) Back

Edit File : netrc.py | Size : 5.44 KB

"""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())

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