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# Copyright (C) 2012 Aleksey Lim
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import logging
from active_document import env
from active_document.metadata import PropertyMeta
from active_toolkit import enforce
_logger = logging.getLogger('active_document.commands')
def command(scope, **kwargs):
def decorate(func):
func.scope = scope
func.kwargs = kwargs
return func
return decorate
volume_command = \
lambda ** kwargs: command('volume', **kwargs)
volume_command_pre = \
lambda ** kwargs: command('volume', wrapper='pre', **kwargs)
volume_command_post = \
lambda ** kwargs: command('volume', wrapper='post', **kwargs)
directory_command = \
lambda ** kwargs: command('directory', **kwargs)
directory_command_pre = \
lambda ** kwargs: command('directory', wrapper='pre', **kwargs)
directory_command_post = \
lambda ** kwargs: command('directory', wrapper='post', **kwargs)
document_command = \
lambda ** kwargs: command('document', **kwargs)
document_command_pre = \
lambda ** kwargs: command('document', wrapper='pre', **kwargs)
document_command_post = \
lambda ** kwargs: command('document', wrapper='post', **kwargs)
property_command = \
lambda ** kwargs: command('property', **kwargs)
property_command_pre = \
lambda ** kwargs: command('property', wrapper='pre', **kwargs)
property_command_post = \
lambda ** kwargs: command('property', wrapper='post', **kwargs)
def to_int(value):
if isinstance(value, basestring):
if not value:
return 0
enforce(value.isdigit(), 'Argument should be an integer value')
return int(value)
return value
def to_list(value):
if isinstance(value, basestring):
if value:
return value.split(',')
else:
return []
return value
class CommandNotFound(Exception):
pass
class Request(dict):
content = None
content_stream = None
content_length = None
content_type = None
access_level = env.ACCESS_REMOTE
accept_language = None
commands = None
response = None
def __init__(self, **kwargs):
dict.__init__(self, kwargs)
self._pos = 0
def __getitem__(self, key):
enforce(key in self, 'Cannot find %r request argument', key)
return self.get(key)
def read(self, size=None):
if self.content_stream is None:
return ''
rest = max(0, self.content_length - self._pos)
size = rest if size is None else min(rest, size)
result = self.content_stream.read(size)
if not result:
return ''
self._pos += len(result)
return result
def clone(self):
request = type(self)()
request.access_level = self.access_level
request.accept_language = self.accept_language
request.commands = self.commands
return request
def call(self, method, content=None, content_stream=None,
content_length=None, **kwargs):
enforce(self.commands is not None)
request = self.clone()
request.update(kwargs)
request['method'] = method
request.content = content
request.content_stream = content_stream
request.content_length = content_length
return self.commands.call(request, Response())
def __repr__(self):
args = ['content_length=%r' % self.content_length,
'access_level=%r' % self.access_level,
'accept_language=%r' % self.accept_language,
] + ['%s=%r' % i for i in self.items()]
return '<active_document.Request %s>' % ' '.join(args)
class Response(dict):
content_length = None
content_type = None
#: UNIX seconds of last modification
last_modified = None
def __init__(self, *args, **props):
if args:
props = args[0]
dict.__init__(self, props)
def __repr__(self):
args = ['%s=%r' % i for i in self.items()]
return '<active_document.Response %s>' % ' '.join(args)
class CommandsProcessor(object):
def __init__(self, volume=None, parent=None):
self._commands = {
'volume': _Commands(),
'directory': _Commands(),
'document': _Commands(),
'property': _Commands(),
}
self.volume = volume
self.parent = parent
self._lang = env.default_lang()
for scope, kwargs in _scan_class(self.__class__, False):
cmd = _Command((self,), **kwargs)
self._commands[scope].add(cmd)
if volume is not None:
for directory in volume.values():
for scope, kwargs in _scan_class(directory.document_class):
cmd = _ObjectCommand(directory, **kwargs)
self._commands[scope].add(cmd)
def super_call(self, request, response):
raise CommandNotFound()
def call(self, request, response=None):
cmd = self.resolve(request)
enforce(cmd is not None, CommandNotFound, 'Unsupported command')
enforce(request.access_level & cmd.access_level, env.Forbidden,
'Operation is permitted on requester\'s level')
if response is None:
response = Response()
request.commands = self
request.response = response
if not request.accept_language:
request.accept_language = [self._lang]
for arg, cast in cmd.arguments.items():
if arg not in request:
continue
try:
request[arg] = cast(request[arg])
except Exception, error:
raise RuntimeError('Cannot typecast %r command argument: %s' %
(arg, error))
args = cmd.get_args(request)
for pre in cmd.pre:
pre(*args, request=request)
kwargs = {}
for arg in cmd.kwarg_names:
if arg == 'request':
kwargs[arg] = request
elif arg == 'response':
kwargs[arg] = response
elif arg not in kwargs:
kwargs[arg] = request.get(arg)
result = cmd.callback(*args, **kwargs)
for post in cmd.post:
result = post(*args, result=result, request=request,
response=response)
if not response.content_type:
if isinstance(result, PropertyMeta):
response.content_type = result.get('mime_type')
if not response.content_type:
response.content_type = cmd.mime_type
return result
def resolve(self, request):
key = (request.get('method', 'GET'), request.get('cmd'), None)
if 'document' not in request:
return self._commands['volume'].get(key)
document_key = key[:2] + (request['document'],)
if 'guid' not in request:
commands = self._commands['directory']
return commands.get(key) or commands.get(document_key)
if 'prop' not in request:
commands = self._commands['document']
return commands.get(key) or commands.get(document_key)
commands = self._commands['property']
return commands.get(key) or commands.get(document_key)
class _Command(object):
def __init__(self, args, callback, method='GET', document=None, cmd=None,
mime_type=None, permissions=0, access_level=env.ACCESS_LEVELS,
arguments=None, pre=None, post=None):
self.args = args
self.callback = callback
self.mime_type = mime_type
self.permissions = permissions
self.access_level = access_level
self.kwarg_names = _function_arg_names(callback)
self.key = (method, cmd, document)
self.arguments = arguments or {}
self.pre = pre
self.post = post
def get_args(self, request):
return self.args
def __repr__(self):
return '%s(method=%s, cmd=%s, document=%s)' % \
((self.callback.__name__,) + self.key)
class _ObjectCommand(_Command):
def __init__(self, directory, **kwargs):
_Command.__init__(self, (), document=directory.metadata.name, **kwargs)
self._directory = directory
def get_args(self, request):
document = self._directory.get(request['guid'])
document.request = request
return (document,)
class _Commands(dict):
def add(self, cmd):
enforce(cmd.key not in self, 'Command %r already exists', cmd)
self[cmd.key] = cmd
def _function_arg_names(func):
if hasattr(func, 'im_func'):
func = func.im_func
if not hasattr(func, 'func_code'):
return []
code = func.func_code
# `1:` is for skipping the first, `self` or `cls`, argument
return code.co_varnames[1:code.co_argcount]
def _scan_class(root_cls, is_document_class=True):
processed = set()
commands = {}
cls = root_cls
while cls is not None:
for name in dir(cls):
if name in processed:
continue
attr = getattr(cls, name)
if not hasattr(attr, 'scope'):
continue
enforce(not is_document_class or
attr.scope in ('document', 'property'),
'Wrong scale command')
key = (attr.scope,
attr.kwargs.get('method') or 'GET',
attr.kwargs.get('cmd'))
kwargs = commands.setdefault(key, {'pre': [], 'post': []})
callback = getattr(root_cls, attr.__name__)
if 'wrapper' not in attr.kwargs:
kwargs.update(attr.kwargs)
kwargs['callback'] = callback
else:
for key in ('arguments',):
if key in attr.kwargs and key not in kwargs:
kwargs[key] = attr.kwargs[key]
kwargs[attr.kwargs['wrapper']].append(callback)
processed.add(name)
cls = cls.__base__
for (scope, method, cmd), kwargs in commands.items():
if 'callback' not in kwargs:
kwargs['method'] = method
if cmd:
kwargs['cmd'] = cmd
kwargs['callback'] = lambda self, request, response: \
self.super_call(request, response)
yield scope, kwargs
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