65 lines
2.5 KiB
Python
65 lines
2.5 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# *****************************************************************************
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Module authors:
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# Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
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#
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# *****************************************************************************
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"""Encoding/decoding Messages"""
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# implement as class as they may need some internal 'state' later on
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# (think compressors)
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from secop.protocol.encoding import MessageEncoder
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from secop.protocol import messages
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from secop.lib.parsing import *
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class TextEncoder(MessageEncoder):
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def __init__(self):
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# build safe namespace
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ns = dict()
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for n in dir(messages):
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if n.endswith(('Request', 'Reply')):
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ns[n] = getattr(messages, n)
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self.namespace = ns
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def encode(self, messageobj):
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"""msg object -> transport layer message"""
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# fun for Humans
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if isinstance(messageobj, messages.HelpMessage):
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return "Error: try one of the following requests:\n" + \
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'\n'.join(['%s(%s)' % (getattr(messages, m).__name__,
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', '.join(getattr(messages, m).ARGS))
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for m in dir(messages)
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if m.endswith('Request') and len(m) > len("Request")])
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res = []
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for k in messageobj.ARGS:
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res.append('%s=%r' % (k, getattr(messageobj, k, None)))
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result = '%s(%s)' % (messageobj.__class__.__name__, ', '.join(res))
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return result
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def decode(self, encoded):
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"""transport layer message -> msg object"""
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# WARNING: highly unsafe!
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# think message='import os\nos.unlink('\')\n'
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try:
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return eval(encoded, self.namespace, {})
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except SyntaxError:
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return messages.HelpMessage()
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