196 lines
7.2 KiB
Python
196 lines
7.2 KiB
Python
from sleekxmpp.xmlstream import JID
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class APIWrapper(object):
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def __init__(self, api, name):
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self.api = api
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self.name = name
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def __getattr__(self, attr):
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"""Curry API management commands with the API name."""
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if attr == 'name':
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return self.name
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elif attr == 'settings':
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return self.api.settings[self.name]
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elif attr == 'register':
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def curried_handler(handler, op, jid=None, node=None, default=False):
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register = getattr(self.api, attr)
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return register(handler, self.name, op, jid, node, default)
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return curried_handler
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elif attr == 'register_default':
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def curried_handler(handler, op, jid=None, node=None):
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return getattr(self.api, attr)(handler, self.name, op)
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return curried_handler
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elif attr in ('run', 'restore_default', 'unregister'):
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def curried_handler(*args, **kwargs):
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return getattr(self.api, attr)(self.name, *args, **kwargs)
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return curried_handler
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return None
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def __getitem__(self, attr):
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def curried_handler(jid=None, node=None, ifrom=None, args=None):
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return self.api.run(self.name, attr, jid, node, ifrom, args)
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return curried_handler
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class APIRegistry(object):
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def __init__(self, xmpp):
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self._handlers = {}
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self._handler_defaults = {}
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self.xmpp = xmpp
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self.settings = {}
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def _setup(self, ctype, op):
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"""Initialize the API callback dictionaries.
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:param string ctype: The name of the API to initialize.
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:param string op: The API operation to initialize.
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"""
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if ctype not in self.settings:
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self.settings[ctype] = {}
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if ctype not in self._handler_defaults:
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self._handler_defaults[ctype] = {}
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if ctype not in self._handlers:
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self._handlers[ctype] = {}
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if op not in self._handlers[ctype]:
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self._handlers[ctype][op] = {'global': None,
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'jid': {},
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'node': {}}
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def wrap(self, ctype):
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"""Return a wrapper object that targets a specific API."""
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return APIWrapper(self, ctype)
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def purge(self, ctype):
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"""Remove all information for a given API."""
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del self.settings[ctype]
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del self._handler_defaults[ctype]
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del self._handlers[ctype]
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def run(self, ctype, op, jid=None, node=None, ifrom=None, args=None):
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"""Execute an API callback, based on specificity.
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The API callback that is executed is chosen based on the combination
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of the provided JID and node:
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JID | node | Handler
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==============================
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Given | Given | Node handler
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Given | None | JID handler
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None | None | Global handler
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A node handler is responsible for servicing a single node at a single
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JID, while a JID handler may respond for any node at a given JID, and
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the global handler will answer to any JID+node combination.
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Handlers should check that the JID ``ifrom`` is authorized to perform
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the desired action.
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:param string ctype: The name of the API to use.
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:param string op: The API operation to perform.
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:param JID jid: Optionally provide specific JID.
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:param string node: Optionally provide specific node.
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:param JID ifrom: Optionally provide the requesting JID.
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:param tuple args: Optional positional arguments to the handler.
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"""
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self._setup(ctype, op)
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if jid in (None, ''):
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jid = self.xmpp.boundjid
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if jid and not isinstance(jid, JID):
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jid = JID(jid)
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if node is None:
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node = ''
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if self.xmpp.is_component:
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if self.settings[ctype].get('component_bare', False):
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jid = jid.bare
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else:
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jid = jid.full
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else:
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if self.settings[ctype].get('client_bare', True):
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jid = jid.bare
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else:
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jid = jid.full
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jid = JID(jid)
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handler = self._handlers[ctype][op]['node'].get((jid, node), None)
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if handler is None:
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handler = self._handlers[ctype][op]['jid'].get(jid, None)
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if handler is None:
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handler = self._handlers[ctype][op].get('global', None)
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if handler:
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try:
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return handler(jid, node, ifrom, args)
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except TypeError:
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# To preserve backward compatibility, drop the ifrom
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# parameter for existing handlers that don't understand it.
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return handler(jid, node, args)
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def register(self, handler, ctype, op, jid=None, node=None, default=False):
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"""Register an API callback, with JID+node specificity.
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The API callback can later be executed based on the
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specificity of the provided JID+node combination.
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See :meth:`~ApiRegistry.run` for more details.
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:param string ctype: The name of the API to use.
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:param string op: The API operation to perform.
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:param JID jid: Optionally provide specific JID.
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:param string node: Optionally provide specific node.
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"""
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self._setup(ctype, op)
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if jid is None and node is None:
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if handler is None:
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handler = self._handler_defaults[op]
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self._handlers[ctype][op]['global'] = handler
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elif jid is not None and node is None:
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self._handlers[ctype][op]['jid'][jid] = handler
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else:
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self._handlers[ctype][op]['node'][(jid, node)] = handler
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if default:
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self.register_default(handler, ctype, op)
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def register_default(self, handler, ctype, op):
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"""Register a default, global handler for an operation.
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:param func handler: The default, global handler for the operation.
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:param string ctype: The name of the API to modify.
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:param string op: The API operation to use.
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"""
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self._setup(ctype, op)
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self._handler_defaults[ctype][op] = handler
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def unregister(self, ctype, op, jid=None, node=None):
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"""Remove an API callback.
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The API callback chosen for removal is based on the
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specificity of the provided JID+node combination.
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See :meth:`~ApiRegistry.run` for more details.
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:param string ctype: The name of the API to use.
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:param string op: The API operation to perform.
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:param JID jid: Optionally provide specific JID.
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:param string node: Optionally provide specific node.
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"""
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self._setup(ctype, op)
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self.register(None, ctype, op, jid, node)
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def restore_default(self, ctype, op, jid=None, node=None):
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"""Reset an API callback to use a default handler.
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:param string ctype: The name of the API to use.
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:param string op: The API operation to perform.
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:param JID jid: Optionally provide specific JID.
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:param string node: Optionally provide specific node.
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"""
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self.unregister(ctype, op, jid, node)
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self.register(self._handler_defaults[ctype][op], ctype, op, jid, node)
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