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rest.py
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238 lines (184 loc) · 8.1 KB
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# -*- coding: utf-8 -*-
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from httplib import *
from urllib2 import *
from _mysql_exceptions import OperationalError
from django.db import transaction
from django.http import HttpResponse
from rest_framework.exceptions import AuthenticationFailed
from networkapi.api_rest.authentication import BasicAuthentication
from networkapi.auth import authenticate
from networkapi.distributedlock import LockNotAcquiredError
from networkapi.error_message_utils import error_dumps
from networkapi.extra_logging import local
from networkapi.infrastructure.xml_utils import XMLError
# from networkapi.usuario.models import UsuarioError
class RestError(Exception):
"""Representa um erro ocorrido durante uma requisão REST."""
def __init__(self, cause, message):
self.cause = cause
self.message = message
def __str__(self):
msg = u'Erro ao realizar requisição REST: Causa: %s, Mensagem: %s' % (
self.cause, self.message)
return msg.encode('utf-8', 'replace')
class UserNotAuthorizedError(RestError):
"""Retorna exceção quando o usuário não tem permissão para executar a operação."""
def __init__(self, cause, message=None):
RestError.__init__(self, cause, message)
class RestResource(object):
"""
Representa um recurso acessível via chamadas REST.
As subclasses de Resource serão responsáveis por expor os serviços de
forma a serem acessados via requisições HTTP.
"""
log = logging.getLogger('RestResource')
@transaction.commit_manually
def handle_request(self, request, *args, **kwargs):
"""Recebe a requisição e redireciona para o método apropriado.
Antes de redirecionar para o método, é feita a autenticação do usuário.
"""
response = None
try:
user = RestResource.authenticate_user(request)
if (user is None):
response = self.not_authenticated()
else:
if request.method == 'GET':
response = self.handle_get(request, user, args, **kwargs)
elif request.method == 'POST':
response = self.handle_post(request, user, args, **kwargs)
elif request.method == 'DELETE':
response = self.handle_delete(
request, user, args, **kwargs)
elif request.method == 'PUT':
response = self.handle_put(request, user, args, **kwargs)
except AuthenticationFailed:
self.log.error(u'Authentication failed.')
response = self.not_authenticated()
except (LockNotAcquiredError, OperationalError), e:
self.log.error(u'Lock wait timeout exceeded.')
return self.response_error(273)
except XMLError, e:
self.log.error(u'Error reading the XML request.')
return self.response_error(3, e)
except Exception, e:
self.log.exception(u'Erro não esperado.')
response = self.response_error(1)
finally:
username, password, user_ldap = RestResource.read_user_data(
request)
# password = '****'
if response is not None:
if response.status_code == 200:
transaction.commit()
else:
transaction.rollback()
else:
transaction.rollback()
self.log.debug(u'Requisição concluída com falha.')
return response
def handle_get(self, request, user, *args, **kwargs):
"""Trata uma requisição com o método GET"""
return self.not_implemented()
def handle_post(self, request, user, *args, **kwargs):
"""Trata uma requisição com o método POST"""
return self.not_implemented()
def handle_delete(self, request, user, *args, **kwargs):
"""Trata uma requisição com o método DELETE"""
return self.not_implemented()
def handle_put(self, request, user, *args, **kwargs):
"""Trata uma requisição com o método PUT"""
return self.not_implemented()
@classmethod
def read_user_data(cls, request):
username = request.META.get('HTTP_NETWORKAPI_USERNAME')
password = request.META.get('HTTP_NETWORKAPI_PASSWORD')
user_ldap = request.META.get('HTTP_NETWORKAPI_USERLDAP')
return username, password, user_ldap
@classmethod
def authenticate_user(cls, request):
if not request.user.is_anonymous():
return request.user
user = None
username, password, user_ldap = RestResource.read_user_data(request)
if user_ldap is None:
user = authenticate(username, password)
else:
user = authenticate(username, password, user_ldap)
if user is None:
credentials = BasicAuthentication().authenticate(request)
user = credentials[0] if credentials is not None else None
if user:
request.user = user
return user
def not_authenticated(self):
http_res = HttpResponse(
u'401 - Usuário não autenticado. Usuário e/ou senha incorretos.',
status=401,
content_type='text/plain')
http_res['X-Request-Id'] = local.request_id
http_res['X-Request-Context'] = local.request_context
return http_res
def not_authorized(self):
http_res = HttpResponse(
u'402 - Usuário não autorizado para executar a operação.',
status=402,
content_type='text/plain')
http_res['X-Request-Id'] = local.request_id
http_res['X-Request-Context'] = local.request_context
return http_res
def not_implemented(self):
"""Cria um HttpResponse com o código HTTP 501 - Not implemented."""
http_res = HttpResponse(
u'501 - Chamada não implementada.',
status=501,
content_type='text/plain')
http_res['X-Request-Id'] = local.request_id
http_res['X-Request-Context'] = local.request_context
return http_res
def response_error(self, code, *args):
"""Cria um HttpResponse com o XML de erro."""
http_res = HttpResponse(
error_dumps(code, *args),
status=500,
content_type='text/plain')
http_res['X-Request-Id'] = local.request_id
http_res['X-Request-Context'] = local.request_context
return http_res
def not_found(self):
"""Cria um HttpResponse com código HTTP 404 - Not Found."""
http_res = HttpResponse(
u'404 - Chamada não encontrada.',
status=404,
content_type='text/plain')
http_res['X-Request-Id'] = local.request_id
http_res['X-Request-Context'] = local.request_context
return http_res
def response(self, content, status=200, content_type='text/plain'):
"""Cria um HttpResponse com os dados informados"""
http_res = HttpResponse(
content,
status=status,
content_type=content_type)
http_res['X-Request-Id'] = local.request_id
http_res['X-Request-Context'] = local.request_context
return http_res
class RestResponse:
"""Classe básica para respostas dos webservices REST"""
def __init__(self, exception=None):
self.exception = exception