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# -*- coding: utf-8 -*-
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"""
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rhodecode.controllers.api
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~~~~~~~~~~~~~~~~~~~~~~~~~
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JSON RPC controller
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:created_on: Aug 20, 2011
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:author: marcink
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:copyright: (C) 2009-2010 Marcin Kuzminski <marcin@python-works.com>
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:license: GPLv3, see COPYING for more details.
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"""
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; version 2
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# of the License or (at your opinion) any later version of the license.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301, USA.
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import inspect
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import logging
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import types
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import urllib
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import traceback
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from rhodecode.lib.compat import izip_longest, json
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from paste.response import replace_header
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from pylons.controllers import WSGIController
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from webob.exc import HTTPNotFound, HTTPForbidden, HTTPInternalServerError, \
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HTTPBadRequest, HTTPError
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from rhodecode.model.db import User
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from rhodecode.lib.auth import AuthUser
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log = logging.getLogger('JSONRPC')
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class JSONRPCError(BaseException):
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def __init__(self, message):
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self.message = message
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def __str__(self):
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return str(self.message)
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def jsonrpc_error(message, code=None):
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"""
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Generate a Response object with a JSON-RPC error body
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"""
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from pylons.controllers.util import Response
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resp = Response(body=json.dumps(dict(result=None, error=message)),
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status=code,
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content_type='application/json')
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return resp
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class JSONRPCController(WSGIController):
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"""
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A WSGI-speaking JSON-RPC controller class
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See the specification:
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<http://json-rpc.org/wiki/specification>`.
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Valid controller return values should be json-serializable objects.
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Sub-classes should catch their exceptions and raise JSONRPCError
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if they want to pass meaningful errors to the client.
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"""
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def _get_method_args(self):
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"""
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Return `self._rpc_args` to dispatched controller method
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chosen by __call__
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"""
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return self._rpc_args
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def __call__(self, environ, start_response):
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"""
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Parse the request body as JSON, look up the method on the
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controller and if it exists, dispatch to it.
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"""
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if 'CONTENT_LENGTH' not in environ:
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log.debug("No Content-Length")
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return jsonrpc_error(message="No Content-Length in request")
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else:
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length = environ['CONTENT_LENGTH'] or 0
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length = int(environ['CONTENT_LENGTH'])
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log.debug('Content-Length: %s', length)
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if length == 0:
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log.debug("Content-Length is 0")
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return jsonrpc_error(message="Content-Length is 0")
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raw_body = environ['wsgi.input'].read(length)
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try:
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json_body = json.loads(urllib.unquote_plus(raw_body))
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except ValueError, e:
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#catch JSON errors Here
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return jsonrpc_error(message="JSON parse error ERR:%s RAW:%r" \
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% (e, urllib.unquote_plus(raw_body)))
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# check AUTH based on API KEY
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try:
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self._req_api_key = json_body['api_key']
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self._req_method = json_body['method']
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self._req_params = json_body['args']
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log.debug('method: %s, params: %s',
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self._req_method,
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self._req_params)
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except KeyError, e:
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return jsonrpc_error(message='Incorrect JSON query missing %s' % e)
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# check if we can find this session using api_key
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try:
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u = User.get_by_api_key(self._req_api_key)
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if u is None:
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return jsonrpc_error(message='Invalid API KEY')
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auth_u = AuthUser(u.user_id, self._req_api_key)
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except Exception, e:
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return jsonrpc_error(message='Invalid API KEY')
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self._error = None
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try:
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self._func = self._find_method()
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except AttributeError, e:
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return jsonrpc_error(message=str(e))
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# now that we have a method, add self._req_params to
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# self.kargs and dispatch control to WGIController
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argspec = inspect.getargspec(self._func)
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arglist = argspec[0][1:]
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defaults = argspec[3] or []
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default_empty = types.NotImplementedType
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kwarglist = list(izip_longest(reversed(arglist), reversed(defaults),
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fillvalue=default_empty))
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# this is little trick to inject logged in user for
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# perms decorators to work they expect the controller class to have
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# rhodecode_user attribute set
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self.rhodecode_user = auth_u
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# This attribute will need to be first param of a method that uses
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# api_key, which is translated to instance of user at that name
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USER_SESSION_ATTR = 'apiuser'
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if USER_SESSION_ATTR not in arglist:
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return jsonrpc_error(message='This method [%s] does not support '
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'authentication (missing %s param)' %
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(self._func.__name__, USER_SESSION_ATTR))
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# get our arglist and check if we provided them as args
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for arg, default in kwarglist:
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if arg == USER_SESSION_ATTR:
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# USER_SESSION_ATTR is something translated from api key and
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# this is checked before so we don't need validate it
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continue
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# skip the required param check if it's default value is
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# NotImplementedType (default_empty)
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if not self._req_params or (type(default) == default_empty
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and arg not in self._req_params):
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return jsonrpc_error(message=('Missing non optional %s arg '
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'in JSON DATA') % arg)
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self._rpc_args = {USER_SESSION_ATTR:u}
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self._rpc_args.update(self._req_params)
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self._rpc_args['action'] = self._req_method
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self._rpc_args['environ'] = environ
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self._rpc_args['start_response'] = start_response
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status = []
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headers = []
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exc_info = []
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def change_content(new_status, new_headers, new_exc_info=None):
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status.append(new_status)
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headers.extend(new_headers)
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exc_info.append(new_exc_info)
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output = WSGIController.__call__(self, environ, change_content)
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output = list(output)
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headers.append(('Content-Length', str(len(output[0]))))
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replace_header(headers, 'Content-Type', 'application/json')
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start_response(status[0], headers, exc_info[0])
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return output
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def _dispatch_call(self):
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"""
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Implement dispatch interface specified by WSGIController
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"""
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try:
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raw_response = self._inspect_call(self._func)
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if isinstance(raw_response, HTTPError):
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self._error = str(raw_response)
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except JSONRPCError, e:
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self._error = str(e)
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except Exception, e:
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log.error('Encountered unhandled exception: %s' \
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% traceback.format_exc())
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json_exc = JSONRPCError('Internal server error')
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self._error = str(json_exc)
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if self._error is not None:
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raw_response = None
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response = dict(result=raw_response, error=self._error)
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try:
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return json.dumps(response)
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except TypeError, e:
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log.debug('Error encoding response: %s', e)
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return json.dumps(dict(result=None,
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error="Error encoding response"))
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def _find_method(self):
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"""
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Return method named by `self._req_method` in controller if able
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"""
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log.debug('Trying to find JSON-RPC method: %s', self._req_method)
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if self._req_method.startswith('_'):
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raise AttributeError("Method not allowed")
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try:
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func = getattr(self, self._req_method, None)
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except UnicodeEncodeError:
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raise AttributeError("Problem decoding unicode in requested "
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"method name.")
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if isinstance(func, types.MethodType):
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return func
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else:
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raise AttributeError("No such method: %s" % self._req_method)
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