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from __future__ import absolute_import

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from __future__ import print_function

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import socket

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import re

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import sslpsk

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import ssl

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import Pyro

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from Pyro.core import PyroURI

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from Pyro.protocol import _connect_socket,TCPConnection,PYROAdapter

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from Pyro.errors import ConnectionDeniedError, ProtocolError

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from Pyro.util import Log

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#

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# The TLS-PSK adapter that handles SSL connections instead of regular sockets,

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# but using Pre Shared Keys instead of Certificates

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#

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class PYROPSKAdapter(PYROAdapter):

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    # This is essentialy the same as in Pyro/protocol.py

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    # only raw_sock wrapping into sock through sslpsk.wrap_socket was added

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    # Pyro unfortunately doesn't allow cleaner customization

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    def bindToURI(self,URI):

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        with self.lock:   # only 1 thread at a time can bind the URI

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            try:

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                self.URI=URI

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                # This are the statements that differ from Pyro/protocol.py

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                raw_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

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                _connect_socket(raw_sock, URI.address, URI.port, self.timeout)

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                sock = sslpsk.wrap_socket(

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                    raw_sock, psk=Pyro.config.PYROPSK, server_side=False,

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                    ciphers="PSK-AES256-GCM-SHA384:PSK-AES256-CBC-SHA",

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                    ssl_version=ssl.PROTOCOL_TLSv1)

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                # all the rest is the same as in Pyro/protocol.py 

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                conn=TCPConnection(sock, sock.getpeername())

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                # receive the authentication challenge string, and use that to build the actual identification string.

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                try:

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                    authChallenge=self.recvAuthChallenge(conn)

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                except ProtocolError,x:

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                    # check if we were denied

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                    if hasattr(x,"partialMsg") and x.partialMsg[:len(self.denyMSG)]==self.denyMSG:

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                        raise ConnectionDeniedError(Pyro.constants.deniedReasons[int(x.partialMsg[-1])])

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                    else:

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                        raise

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                # reply with our ident token, generated from the ident passphrase and the challenge

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                msg = self._sendConnect(sock,self.newConnValidator.createAuthToken(self.ident, authChallenge, conn.addr, self.URI, None) )

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                if msg==self.acceptMSG:

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                    self.conn=conn

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                    self.conn.connected=1

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                    Log.msg('PYROAdapter','connected to',str(URI))

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                    if URI.protocol=='PYROLOCPSK':

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                        self.resolvePYROLOC_URI("PYROPSK") # updates self.URI

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                elif msg[:len(self.denyMSG)]==self.denyMSG:

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                    try:

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                        raise ConnectionDeniedError(Pyro.constants.deniedReasons[int(msg[-1])])

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                    except (KeyError,ValueError):

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                        raise ConnectionDeniedError('invalid response')

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            except socket.error:

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                Log.msg('PYROAdapter','connection failed to URI',str(URI))

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                raise ProtocolError('connection failed')

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_getProtocolAdapter = Pyro.protocol.getProtocolAdapter

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def getProtocolAdapter(protocol):

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    if protocol in ('PYROPSK', 'PYROLOCPSK'):

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        return PYROPSKAdapter()

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    return _getProtocolAdapter(protocol)

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Pyro.protocol.getProtocolAdapter = getProtocolAdapter

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_processStringURI = Pyro.core.processStringURI

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def processStringURI(URI):

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    x=re.match(r'(?P<protocol>PYROLOCPSK)://(?P<hostname>[^\s:]+):?(?P<port>\d+)?/(?P<name>\S*)',URI)

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    if x:

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        protocol=x.group('protocol')

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        hostname=x.group('hostname')

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        port=x.group('port')

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        if port:

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            port=int(port)

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        else:

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            port=0

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        name=x.group('name')

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        return PyroURI(hostname,name,port,protocol)

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    return _processStringURI(URI)

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Pyro.core.processStringURI = processStringURI