django1/django/test/client.py

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import sys
from cStringIO import StringIO
from urlparse import urlparse
from django.conf import settings
from django.core.handlers.base import BaseHandler
from django.core.handlers.wsgi import WSGIRequest
from django.core.signals import got_request_exception
from django.dispatch import dispatcher
from django.http import urlencode, SimpleCookie
from django.test import signals
from django.utils.functional import curry
BOUNDARY = 'BoUnDaRyStRiNg'
MULTIPART_CONTENT = 'multipart/form-data; boundary=%s' % BOUNDARY
class ClientHandler(BaseHandler):
"""
A HTTP Handler that can be used for testing purposes.
Uses the WSGI interface to compose requests, but returns
the raw HttpResponse object
"""
def __call__(self, environ):
from django.conf import settings
from django.core import signals
# Set up middleware if needed. We couldn't do this earlier, because
# settings weren't available.
if self._request_middleware is None:
self.load_middleware()
dispatcher.send(signal=signals.request_started)
try:
request = WSGIRequest(environ)
response = self.get_response(request)
# Apply response middleware
for middleware_method in self._response_middleware:
response = middleware_method(request, response)
finally:
dispatcher.send(signal=signals.request_finished)
return response
def store_rendered_templates(store, signal, sender, template, context):
"A utility function for storing templates and contexts that are rendered"
store.setdefault('template',[]).append(template)
store.setdefault('context',[]).append(context)
def encode_multipart(boundary, data):
"""
A simple method for encoding multipart POST data from a dictionary of
form values.
The key will be used as the form data name; the value will be transmitted
as content. If the value is a file, the contents of the file will be sent
as an application/octet-stream; otherwise, str(value) will be sent.
"""
lines = []
for (key, value) in data.items():
if isinstance(value, file):
lines.extend([
'--' + boundary,
'Content-Disposition: form-data; name="%s"' % key,
'',
'--' + boundary,
'Content-Disposition: form-data; name="%s_file"; filename="%s"' % (key, value.name),
'Content-Type: application/octet-stream',
'',
value.read()
])
else:
lines.extend([
'--' + boundary,
'Content-Disposition: form-data; name="%s"' % key,
'',
str(value)
])
lines.extend([
'--' + boundary + '--',
'',
])
return '\r\n'.join(lines)
class Client:
"""
A class that can act as a client for testing purposes.
It allows the user to compose GET and POST requests, and
obtain the response that the server gave to those requests.
The server Response objects are annotated with the details
of the contexts and templates that were rendered during the
process of serving the request.
Client objects are stateful - they will retain cookie (and
thus session) details for the lifetime of the Client instance.
This is not intended as a replacement for Twill/Selenium or
the like - it is here to allow testing against the
contexts and templates produced by a view, rather than the
HTML rendered to the end-user.
"""
def __init__(self, **defaults):
self.handler = ClientHandler()
self.defaults = defaults
self.cookies = SimpleCookie()
self.session = {}
self.exc_info = None
def store_exc_info(self, *args, **kwargs):
"""
Utility method that can be used to store exceptions when they are
generated by a view.
"""
self.exc_info = sys.exc_info()
def request(self, **request):
"""
The master request method. Composes the environment dictionary
and passes to the handler, returning the result of the handler.
Assumes defaults for the query environment, which can be overridden
using the arguments to the request.
"""
environ = {
'HTTP_COOKIE': self.cookies,
'PATH_INFO': '/',
'QUERY_STRING': '',
'REQUEST_METHOD': 'GET',
'SCRIPT_NAME': None,
'SERVER_NAME': 'testserver',
'SERVER_PORT': 80,
'SERVER_PROTOCOL': 'HTTP/1.1',
}
environ.update(self.defaults)
environ.update(request)
# Curry a data dictionary into an instance of
# the template renderer callback function
data = {}
on_template_render = curry(store_rendered_templates, data)
dispatcher.connect(on_template_render, signal=signals.template_rendered)
# Capture exceptions created by the handler
dispatcher.connect(self.store_exc_info, signal=got_request_exception)
response = self.handler(environ)
# Add any rendered template detail to the response
# If there was only one template rendered (the most likely case),
# flatten the list to a single element
for detail in ('template', 'context'):
if data.get(detail):
if len(data[detail]) == 1:
setattr(response, detail, data[detail][0]);
else:
setattr(response, detail, data[detail])
else:
setattr(response, detail, None)
# Look for a signalled exception and reraise it
if self.exc_info:
raise self.exc_info[1], None, self.exc_info[2]
# Update persistent cookie and session data
if response.cookies:
self.cookies.update(response.cookies)
if 'django.contrib.sessions' in settings.INSTALLED_APPS:
from django.contrib.sessions.middleware import SessionWrapper
cookie = self.cookies.get(settings.SESSION_COOKIE_NAME, None)
if cookie:
self.session = SessionWrapper(cookie.value)
return response
def get(self, path, data={}, **extra):
"Request a response from the server using GET."
r = {
'CONTENT_LENGTH': None,
'CONTENT_TYPE': 'text/html; charset=utf-8',
'PATH_INFO': path,
'QUERY_STRING': urlencode(data),
'REQUEST_METHOD': 'GET',
}
r.update(extra)
return self.request(**r)
def post(self, path, data={}, content_type=MULTIPART_CONTENT, **extra):
"Request a response from the server using POST."
if content_type is MULTIPART_CONTENT:
post_data = encode_multipart(BOUNDARY, data)
else:
post_data = data
r = {
'CONTENT_LENGTH': len(post_data),
'CONTENT_TYPE': content_type,
'PATH_INFO': path,
'REQUEST_METHOD': 'POST',
'wsgi.input': StringIO(post_data),
}
r.update(extra)
return self.request(**r)
def login(self, path, username, password, **extra):
"""
A specialized sequence of GET and POST to log into a view that
is protected by a @login_required access decorator.
path should be the URL of the page that is login protected.
Returns the response from GETting the requested URL after
login is complete. Returns False if login process failed.
"""
# First, GET the page that is login protected.
# This page will redirect to the login page.
response = self.get(path)
if response.status_code != 302:
return False
_, _, login_path, _, data, _= urlparse(response['Location'])
next = data.split('=')[1]
# Second, GET the login page; required to set up cookies
response = self.get(login_path, **extra)
if response.status_code != 200:
return False
# Last, POST the login data.
form_data = {
'username': username,
'password': password,
'next' : next,
}
response = self.post(login_path, data=form_data, **extra)
# Login page should 302 redirect to the originally requested page
if (response.status_code != 302 or
urlparse(response['Location'])[2] != path):
return False
# Since we are logged in, request the actual page again
return self.get(path)