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5d22ee9a76
This includes a process_patch_as_post decorator which enables this view to be invoked as a PATCH on an object. Hopefully this decorator can go away once POST values are correctly parsed in Django for PATCH verb invocations. (imported from commit 6cf9d69cfb9dea5354ea37408566146757b5be54)
343 lines
13 KiB
Python
343 lines
13 KiB
Python
from django.views.decorators.csrf import csrf_exempt
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from django.views.decorators.http import require_POST
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from django.http import QueryDict
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from django.http.multipartparser import MultiPartParser
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from zephyr.models import UserProfile, UserActivity, get_client
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from zephyr.lib.response import json_success, json_error, HttpResponseUnauthorized
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from django.utils.timezone import now
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from django.db import transaction, IntegrityError
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from django.conf import settings
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import simplejson
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from StringIO import StringIO
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from zephyr.lib.cache import cache_with_key
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from zephyr.lib.queue import queue_json_publish
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from zephyr.lib.timestamp import datetime_to_timestamp
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from zephyr.lib.cache import user_profile_by_email_cache_key, \
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user_profile_by_user_cache_key
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from functools import wraps
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import base64
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class _RespondAsynchronously(object):
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pass
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# Return RespondAsynchronously from an @asynchronous view if the
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# response will be provided later by calling handler.humbug_finish(),
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# or has already been provided this way. We use this for longpolling
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# mode.
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RespondAsynchronously = _RespondAsynchronously()
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def asynchronous(method):
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@wraps(method)
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def wrapper(request, *args, **kwargs):
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return method(request, handler=request._tornado_handler, *args, **kwargs)
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if getattr(method, 'csrf_exempt', False):
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wrapper.csrf_exempt = True
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return wrapper
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def update_user_activity(request, user_profile):
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# update_active_status also pushes to rabbitmq, and it seems
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# redundant to log that here as well.
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if request.META["PATH_INFO"] == '/json/update_active_status':
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return
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event={'type': 'user_activity',
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'query': request.META["PATH_INFO"],
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'user_profile_id': user_profile.id,
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'time': datetime_to_timestamp(now()),
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'client': request.client.name}
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# TODO: It's possible that this should call process_user_activity
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# from zephyr.lib.actions for maximal consistency.
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queue_json_publish("user_activity", event, lambda event: None)
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# I like the all-lowercase name better
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require_post = require_POST
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@cache_with_key(user_profile_by_user_cache_key, timeout=3600*24*7)
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def get_user_profile_by_user_id(user_id):
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return UserProfile.objects.select_related().get(user_id=user_id)
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@cache_with_key(user_profile_by_email_cache_key, timeout=3600*24*7)
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def get_user_profile_by_email(email):
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return UserProfile.objects.select_related().get(user__email__iexact=email)
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def process_client(request, user_profile):
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try:
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# we want to take from either GET or POST vars
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request.client = get_client(request.REQUEST['client'])
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except (AttributeError, KeyError):
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request.client = get_client("API")
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update_user_activity(request, user_profile)
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def validate_api_key(email, api_key):
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try:
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user_profile = get_user_profile_by_email(email)
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except UserProfile.DoesNotExist:
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raise JsonableError("Invalid user: %s" % (email,))
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if api_key != user_profile.api_key:
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raise JsonableError("Invalid API key for user '%s'" % (email,))
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return user_profile
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# authenticated_api_view will add the authenticated user's user_profile to
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# the view function's arguments list, since we have to look it up
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# anyway.
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def authenticated_api_view(view_func):
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@csrf_exempt
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@require_post
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@has_request_variables
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@wraps(view_func)
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def _wrapped_view_func(request, email=POST, api_key=POST('api-key'),
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*args, **kwargs):
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user_profile = validate_api_key(email, api_key)
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request._email = email
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process_client(request, user_profile)
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return view_func(request, user_profile, *args, **kwargs)
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return _wrapped_view_func
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def authenticated_rest_api_view(view_func):
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@csrf_exempt
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@wraps(view_func)
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def _wrapped_view_func(request, *args, **kwargs):
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# First try block attempts to get the credentials we need to do authentication
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try:
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# Grab the base64-encoded authentication string, decode it, and split it into
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# the email and API key
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auth_type, encoded_value = request.META['HTTP_AUTHORIZATION'].split()
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# case insensitive per RFC 1945
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if auth_type.lower() != "basic":
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return json_error("Only Basic authentication is supported.")
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email, api_key = base64.b64decode(encoded_value).split(":")
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except ValueError:
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return json_error("Invalid authorization header for basic auth")
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except KeyError:
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return HttpResponseUnauthorized("humbug")
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# Now we try to do authentication or die
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try:
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user_profile = validate_api_key(email, api_key)
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except JsonableError, e:
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resp = HttpResponseUnauthorized("humbug")
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resp.content = e.error
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return resp
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process_client(request, user_profile)
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return view_func(request, user_profile, *args, **kwargs)
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return _wrapped_view_func
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def process_patch_as_post(view_func):
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@wraps(view_func)
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def _wrapped_view_func(request, *args, **kwargs):
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# Adapted from django/http/__init__.py.
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# So by default Django doesn't populate request.POST for anything besides
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# POST requests. We want this dict populated for PATCH, so we have to
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# do it ourselves.
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#
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# This will not be required in the future, a bug will be filed against
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# Django upstream.
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if request.META.get('CONTENT_TYPE', '').startswith('multipart'):
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request.POST = MultiPartParser(request.META, StringIO(request.body),
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[], request.encoding).parse()[0]
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else:
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request.POST = QueryDict(request.body, encoding=request.encoding)
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return view_func(request, *args, **kwargs)
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return _wrapped_view_func
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def authenticate_log_and_execute_json(request, client, view_func, *args, **kwargs):
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if not request.user.is_authenticated():
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return json_error("Not logged in", status=401)
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request.client = client
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user_profile = get_user_profile_by_user_id(request.user.id)
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request._email = user_profile.user.email
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update_user_activity(request, user_profile)
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return view_func(request, user_profile, *args, **kwargs)
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# Checks if the request is a POST request and that the user is logged
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# in. If not, return an error (the @login_required behavior of
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# redirecting to a login page doesn't make sense for json views)
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def authenticated_json_post_view(view_func):
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@require_post
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@has_request_variables
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@wraps(view_func)
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def _wrapped_view_func(request,
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client=POST(default=get_client("website"), converter=get_client),
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*args, **kwargs):
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return authenticate_log_and_execute_json(request, client, view_func, *args, **kwargs)
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return _wrapped_view_func
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def authenticated_json_view(view_func):
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@wraps(view_func)
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def _wrapped_view_func(request,
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client=get_client("website"),
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*args, **kwargs):
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return authenticate_log_and_execute_json(request, client, view_func, *args, **kwargs)
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return _wrapped_view_func
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# These views are used by the main Django server to notify the Tornado server
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# of events. We protect them from the outside world by checking a shared
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# secret, and also the originating IP (for now).
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def authenticate_notify(request):
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return (request.META['REMOTE_ADDR'] in ('127.0.0.1', '::1')
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and request.POST.get('secret') == settings.SHARED_SECRET)
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def internal_notify_view(view_func):
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@csrf_exempt
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@require_post
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@wraps(view_func)
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def _wrapped_view_func(request, *args, **kwargs):
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if not authenticate_notify(request):
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return json_error('Access denied', status=403)
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if not hasattr(request, '_tornado_handler'):
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# We got called through the non-Tornado server somehow.
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# This is not a security check; it's an internal assertion
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# to help us find bugs.
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raise RuntimeError, 'notify view called with no Tornado handler'
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request._email = "internal"
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return view_func(request, *args, **kwargs)
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return _wrapped_view_func
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class JsonableError(Exception):
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def __init__(self, error):
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self.error = error
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def __str__(self):
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return self.to_json_error_msg()
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def to_json_error_msg(self):
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return self.error
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class RequestVariableMissingError(JsonableError):
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def __init__(self, var_name):
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self.var_name = var_name
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def to_json_error_msg(self):
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return "Missing '%s' argument" % (self.var_name,)
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class RequestVariableConversionError(JsonableError):
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def __init__(self, var_name, bad_value):
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self.var_name = var_name
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self.bad_value = bad_value
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def to_json_error_msg(self):
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return "Bad value for '%s': %s" % (self.var_name, self.bad_value)
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# Used in conjunction with @has_request_variables, below
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class POST(object):
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# NotSpecified is a sentinel value for determining whether a
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# default value was specified for a request variable. We can't
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# use None because that could be a valid, user-specified default
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class _NotSpecified(object):
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pass
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NotSpecified = _NotSpecified()
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def __init__(self, whence=None, converter=None, default=NotSpecified):
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"""
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whence: the name of the request variable that should be used
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for this parameter. Defaults to a request variable of the
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same name as the parameter.
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converter: a function that takes a string and returns a new
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value. If specified, this will be called on the request
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variable value before passing to the function
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default: a value to be used for the argument if the parameter
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is missing in the request
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"""
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self.post_var_name = whence
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self.func_var_name = None
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self.converter = converter
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self.default = default
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# Extracts variables from the request object and passes them as
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# named function arguments. The request object must be the first
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# argument to the function.
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#
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# To use, assign a function parameter a default value that is an
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# instance of the POST class. That paramter will then be
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# automatically populated from the HTTP request. The request object
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# must be the first argument to the decorated function.
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#
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# This should generally be the innermost (syntactically bottommost)
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# decorator applied to a view, since other decorators won't preserve
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# the default parameter values used by has_request_variables.
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#
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# Note that this can't be used in helper functions which are not
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# expected to call json_error or json_success, as it uses json_error
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# internally when it encounters an error
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def has_request_variables(view_func):
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num_params = view_func.func_code.co_argcount
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if view_func.func_defaults is None:
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num_default_params = 0
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else:
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num_default_params = len(view_func.func_defaults)
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default_param_names = view_func.func_code.co_varnames[num_params - num_default_params:]
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default_param_values = view_func.func_defaults
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if default_param_values is None:
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default_param_values = []
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post_params = []
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for (name, value) in zip(default_param_names, default_param_values):
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if isinstance(value, POST):
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value.func_var_name = name
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if value.post_var_name is None:
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value.post_var_name = name
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post_params.append(value)
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elif value == POST:
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# If the function definition does not actually
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# instantiate a POST object but instead uses the POST
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# class itself as a value, we instantiate it as a
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# convenience
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post_var = POST(name)
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post_var.func_var_name = name
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post_params.append(post_var)
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@wraps(view_func)
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def _wrapped_view_func(request, *args, **kwargs):
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for param in post_params:
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if param.func_var_name in kwargs:
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continue
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default_assigned = False
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try:
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val = request.POST[param.post_var_name]
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except KeyError:
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if param.default is POST.NotSpecified:
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raise RequestVariableMissingError(param.post_var_name)
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val = param.default
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default_assigned = True
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if param.converter is not None and not default_assigned:
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try:
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val = param.converter(val)
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except:
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raise RequestVariableConversionError(param.post_var_name, val)
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kwargs[param.func_var_name] = val
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return view_func(request, *args, **kwargs)
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return _wrapped_view_func
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# Converter functions for use with has_request_variables
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def to_non_negative_int(x):
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x = int(x)
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if x < 0:
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raise ValueError("argument is negative")
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return x
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def json_to_foo(json, type):
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data = simplejson.loads(json)
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if not isinstance(data, type):
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raise ValueError("argument is not a %s" % (type().__class__.__name__))
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return data
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def json_to_dict(json):
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return json_to_foo(json, dict)
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def json_to_list(json):
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return json_to_foo(json, list)
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def json_to_bool(json):
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return json_to_foo(json, bool)
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