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views.py
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views.py
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import base64
import json
import requests
from django.utils import six
from django.utils.six import BytesIO as StringIO
from requests.exceptions import ConnectionError, SSLError, Timeout
from requests import sessions
from django.http import HttpResponse
from rest_framework.response import Response
from rest_framework.views import APIView
from rest_framework.utils.mediatypes import media_type_matches
from rest_framework.exceptions import UnsupportedMediaType
from djangorest_proxy.settings import api_proxy_settings
from djangorest_proxy.adapters import StreamingHTTPAdapter
from djangorest_proxy.utils import StreamingMultipart, generate_boundary
class BaseProxyView(APIView):
# Si no se define el proxy_key se agarra por defecto la primera configuracion
proxy_host = None
source = None
return_raw = False
verify_ssl = None
def __init__(self):
self.proxy_settings = api_proxy_settings[self.proxy_key]
class ProxyView(BaseProxyView):
"""
Proxy view
"""
def get_proxy_host(self):
return self.proxy_host or self.proxy_settings.HOST
def get_source_path(self):
if self.source:
return self.source % self.kwargs
return None
def get_request_url(self, request):
host = self.get_proxy_host()
path = self.get_source_path()
if path:
return '/'.join([host, path])
return host
def get_request_params(self, request):
if request.query_params:
qp = request.query_params.copy()
for param in self.proxy_settings.DISALLOWED_PARAMS:
if param in qp:
del qp[param]
return six.iterlists(qp)
return {}
def get_request_data(self, request):
if 'application/json' in request.content_type:
return json.dumps(request.data)
return request.data
def get_request_files(self, request):
files = {}
if request.FILES:
for field, content in request.FILES.items():
files[field] = content
return files
def get_default_headers(self, request):
return {
'Accept': request.META.get('HTTP_ACCEPT', self.proxy_settings.DEFAULT_HTTP_ACCEPT),
'Accept-Language': request.META.get('HTTP_ACCEPT_LANGUAGE', self.proxy_settings.DEFAULT_HTTP_ACCEPT_LANGUAGE),
'Content-Type': request.META.get('CONTENT_TYPE', self.proxy_settings.DEFAULT_CONTENT_TYPE),
}
def get_headers(self, request):
#import re
#regex = re.compile('^HTTP_')
#request_headers = dict((regex.sub('', header), value) for (header, value) in request.META.items() if header.startswith('HTTP_'))
headers = self.get_default_headers(request)
# Translate Accept HTTP field
accept_maps = self.proxy_settings.ACCEPT_MAPS
for old, new in accept_maps.items():
headers['Accept'] = headers['Accept'].replace(old, new)
xtype = self.proxy_settings.AUTH['type']
print "-----------------------------------------------"
print xtype
if xtype == "Basic":
username = self.proxy_settings.AUTH['user']
password = self.proxy_settings.AUTH['password']
if username and password:
base64string = base64.encodestring('%s:%s' % (username, password)).replace('\n', '')
headers['Authorization'] = 'Basic %s' % base64string
else:
auth_token = self.proxy_settings.AUTH.get('token')
if auth_token:
headers['Authorization'] = auth_token
if xtype == "JWT":
headers = self.get_headers_jwt(request, headers)
print xtype
return headers
def get_headers_jwt(self, request, headers, status=200):
"""
:param request: Maneja el evento de pedido url actual
:param status: Estado de respuesta si es estado 401 vuelve a renovar el token
:return: Cabecera (header)
"""
if not ("drf_jwt_token" in request.session) or status == 401:
xhost = self.proxy_settings.HOST
xurl_token = self.proxy_settings.AUTH['auth_url']
post_data = self.proxy_settings.AUTH['auth_credentials']
post_request = requests.post("%s/%s" % (xhost, xurl_token), data=post_data)
if "token" in post_request.json():
request.session['drf_jwt_token'] = post_request.json()["token"]
else:
print "No se hallo la variable 'token' -> %s" % post_request.text
xprefix = self.proxy_settings.AUTH['jwt_auth_header_prefix']
auth_header_key = self.proxy_settings.AUTH['auth_header_key']
headers[auth_header_key] = "%s %s" % (xprefix, request.session['drf_jwt_token'])
return headers
def get_datos(self):
return self.get_headers_jwt()
def get_verify_ssl(self, request):
return self.verify_ssl or self.proxy_settings.VERIFY_SSL
def get_cookies(self, requests):
return None
def parse_proxy_response(self, response):
"""
Modified version of rest_framework.request.Request._parse(self)
"""
parsers = self.get_parsers()
stream = StringIO(response._content)
content_type = response.headers.get('content-type', None)
if stream is None or content_type is None:
return {}
parser = None
for item in parsers:
if media_type_matches(item.media_type, content_type):
parser = item
if not parser:
raise UnsupportedMediaType(content_type)
parsed = parser.parse(stream, content_type)
# Parser classes may return the raw data, or a
# DataAndFiles object. Return only data.
try:
return parsed.data
except AttributeError:
return parsed
def create_response(self, response):
if self.return_raw or self.proxy_settings.RETURN_RAW:
return HttpResponse(response.text, status=response.status_code,
content_type=response.headers.get('content-type'))
status = response.status_code
if status >= 400:
body = {
'code': status,
'error': response.reason,
}
else:
body = self.parse_proxy_response(response)
return Response(body, status)
def create_error_response(self, body, status):
return Response(body, status)
def proxy(self, request, *args, **kwargs):
print api_proxy_settings.keys()[0]
url = self.get_request_url(request)
params = self.get_request_params(request)
data = self.get_request_data(request)
files = self.get_request_files(request)
headers = self.get_headers(request)
verify_ssl = self.get_verify_ssl(request)
cookies = self.get_cookies(request)
sw_count = self.proxy_settings.AUTH['num_attemps']
# sw_count = 3
try:
while sw_count >= 1:
if files:
"""
By default requests library uses chunked upload for files
but it is much more easier for servers to handle streamed
uploads.
This new implementation is also lightweight as files are not
read entirely into memory.
"""
boundary = generate_boundary()
headers['Content-Type'] = 'multipart/form-data; boundary=%s' % boundary
body = StreamingMultipart(data, files, boundary)
session = sessions.Session()
session.mount('http://', StreamingHTTPAdapter())
session.mount('https://', StreamingHTTPAdapter())
response = session.request(request.method, url,
params=params,
data=body,
headers=headers,
timeout=self.proxy_settings.TIMEOUT,
verify=verify_ssl,
cookies=cookies)
else:
print request
print url
print verify_ssl
print params
response = requests.request(request.method, url,
params=params,
data=data,
files=files,
headers=headers,
timeout=self.proxy_settings.TIMEOUT,
verify=verify_ssl,
cookies=cookies)
if response.status_code == 401:
headers = self.get_headers_jwt(request, headers, response.status_code)
if response.status_code == 200:
sw_count = 0
sw_count -= 1
except (ConnectionError, SSLError):
print ConnectionError
status = requests.status_codes.codes.bad_gateway
return self.create_error_response({
'code': status,
'error': 'Bad gateway',
}, status)
except (Timeout):
status = requests.status_codes.codes.gateway_timeout
return self.create_error_response({
'code': status,
'error': 'Gateway timed out',
}, status)
return self.create_response(response)
def get(self, request, *args, **kwargs):
return self.proxy(request, *args, **kwargs)
def put(self, request, *args, **kwargs):
return self.proxy(request, *args, **kwargs)
def post(self, request, *args, **kwargs):
return self.proxy(request, *args, **kwargs)
def patch(self, request, *args, **kwargs):
return self.proxy(request, *args, **kwargs)
def delete(self, request, *args, **kwargs):
return self.proxy(request, *args, **kwargs)