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zulip/zerver/middleware.py

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import cProfile
import logging
import time
import traceback
from typing import (
Any,
AnyStr,
Callable,
Dict,
Iterable,
Iterator,
List,
MutableMapping,
Optional,
Tuple,
)
from django.conf import settings
from django.conf.urls.i18n import is_language_prefix_patterns_used
from django.db import connection
from django.http import HttpRequest, HttpResponse, HttpResponseRedirect, StreamingHttpResponse
from django.http.response import HttpResponseBase
from django.middleware.common import CommonMiddleware
from django.middleware.locale import LocaleMiddleware as DjangoLocaleMiddleware
from django.shortcuts import render
from django.utils import translation
from django.utils.cache import patch_vary_headers
from django.utils.deprecation import MiddlewareMixin
from django.utils.translation import gettext as _
from django.views.csrf import csrf_failure as html_csrf_failure
from django_scim.middleware import SCIMAuthCheckMiddleware
from django_scim.settings import scim_settings
from sentry_sdk import capture_exception
from sentry_sdk.integrations.logging import ignore_logger
from zerver.lib.cache import get_remote_cache_requests, get_remote_cache_time
from zerver.lib.db import reset_queries
from zerver.lib.debug import maybe_tracemalloc_listen
from zerver.lib.exceptions import ErrorCode, JsonableError, MissingAuthenticationError
from zerver.lib.html_to_text import get_content_description
from zerver.lib.markdown import get_markdown_requests, get_markdown_time
from zerver.lib.rate_limiter import RateLimitResult
from zerver.lib.request import RequestNotes, set_request, unset_request
from zerver.lib.response import json_response, json_response_from_error, json_unauthorized
from zerver.lib.subdomains import get_subdomain
from zerver.lib.types import ViewFuncT
from zerver.lib.user_agent import parse_user_agent
from zerver.lib.utils import statsd
from zerver.models import Realm, SCIMClient, flush_per_request_caches, get_realm
logger = logging.getLogger("zulip.requests")
slow_query_logger = logging.getLogger("zulip.slow_queries")
def record_request_stop_data(log_data: MutableMapping[str, Any]) -> None:
log_data["time_stopped"] = time.time()
log_data["remote_cache_time_stopped"] = get_remote_cache_time()
log_data["remote_cache_requests_stopped"] = get_remote_cache_requests()
log_data["markdown_time_stopped"] = get_markdown_time()
log_data["markdown_requests_stopped"] = get_markdown_requests()
if settings.PROFILE_ALL_REQUESTS:
log_data["prof"].disable()
def async_request_timer_stop(request: HttpRequest) -> None:
log_data = RequestNotes.get_notes(request).log_data
assert log_data is not None
record_request_stop_data(log_data)
def record_request_restart_data(log_data: MutableMapping[str, Any]) -> None:
if settings.PROFILE_ALL_REQUESTS:
log_data["prof"].enable()
log_data["time_restarted"] = time.time()
log_data["remote_cache_time_restarted"] = get_remote_cache_time()
log_data["remote_cache_requests_restarted"] = get_remote_cache_requests()
log_data["markdown_time_restarted"] = get_markdown_time()
log_data["markdown_requests_restarted"] = get_markdown_requests()
def async_request_timer_restart(request: HttpRequest) -> None:
log_data = RequestNotes.get_notes(request).log_data
assert log_data is not None
if "time_restarted" in log_data:
# Don't destroy data when being called from
# finish_current_handler
return
record_request_restart_data(log_data)
def record_request_start_data(log_data: MutableMapping[str, Any]) -> None:
if settings.PROFILE_ALL_REQUESTS:
log_data["prof"] = cProfile.Profile()
log_data["prof"].enable()
reset_queries()
log_data["time_started"] = time.time()
log_data["remote_cache_time_start"] = get_remote_cache_time()
log_data["remote_cache_requests_start"] = get_remote_cache_requests()
log_data["markdown_time_start"] = get_markdown_time()
log_data["markdown_requests_start"] = get_markdown_requests()
def timedelta_ms(timedelta: float) -> float:
return timedelta * 1000
def format_timedelta(timedelta: float) -> str:
if timedelta >= 1:
return f"{timedelta:.1f}s"
return f"{timedelta_ms(timedelta):.0f}ms"
def is_slow_query(time_delta: float, path: str) -> bool:
if time_delta < 1.2:
return False
is_exempt = (
path in ["/activity", "/json/report/error", "/api/v1/deployments/report_error"]
or path.startswith("/realm_activity/")
or path.startswith("/user_activity/")
)
if is_exempt:
return time_delta >= 5
if "webathena_kerberos" in path:
return time_delta >= 10
return True
statsd_blacklisted_requests = [
"do_confirm",
"signup_send_confirm",
"new_realm_send_confirm",
"eventslast_event_id",
"webreq.content",
"avatar",
"user_uploads",
"password.reset",
"static",
"json.bots",
"json.users",
"json.streams",
"accounts.unsubscribe",
"apple-touch-icon",
"emoji",
"json.bots",
"upload_file",
"realm_activity",
"user_activity",
]
def write_log_line(
log_data: MutableMapping[str, Any],
path: str,
method: str,
remote_ip: str,
requestor_for_logs: str,
client_name: str,
client_version: Optional[str] = None,
status_code: int = 200,
error_content: Optional[AnyStr] = None,
error_content_iter: Optional[Iterable[AnyStr]] = None,
) -> None:
assert error_content is None or error_content_iter is None
if error_content is not None:
error_content_iter = (error_content,)
if settings.STATSD_HOST != "":
# For statsd timer name
if path == "/":
statsd_path = "webreq"
else:
statsd_path = "webreq.{}".format(path[1:].replace("/", "."))
# Remove non-ascii chars from path (there should be none; if there are, it's
# because someone manually entered a nonexistent path), as UTF-8 chars make
# statsd sad when it sends the key name over the socket
statsd_path = statsd_path.encode("ascii", errors="ignore").decode("ascii")
# TODO: This could probably be optimized to use a regular expression rather than a loop.
suppress_statsd = any(
blacklisted in statsd_path for blacklisted in statsd_blacklisted_requests
)
else:
suppress_statsd = True
statsd_path = ""
time_delta = -1
# A time duration of -1 means the StartLogRequests middleware
# didn't run for some reason
optional_orig_delta = ""
if "time_started" in log_data:
time_delta = time.time() - log_data["time_started"]
if "time_stopped" in log_data:
orig_time_delta = time_delta
time_delta = (log_data["time_stopped"] - log_data["time_started"]) + (
time.time() - log_data["time_restarted"]
)
optional_orig_delta = f" (lp: {format_timedelta(orig_time_delta)})"
remote_cache_output = ""
if "remote_cache_time_start" in log_data:
remote_cache_time_delta = get_remote_cache_time() - log_data["remote_cache_time_start"]
remote_cache_count_delta = (
get_remote_cache_requests() - log_data["remote_cache_requests_start"]
)
if "remote_cache_requests_stopped" in log_data:
# (now - restarted) + (stopped - start) = (now - start) + (stopped - restarted)
remote_cache_time_delta += (
log_data["remote_cache_time_stopped"] - log_data["remote_cache_time_restarted"]
)
remote_cache_count_delta += (
log_data["remote_cache_requests_stopped"]
- log_data["remote_cache_requests_restarted"]
)
if remote_cache_time_delta > 0.005:
remote_cache_output = (
f" (mem: {format_timedelta(remote_cache_time_delta)}/{remote_cache_count_delta})"
)
if not suppress_statsd:
statsd.timing(f"{statsd_path}.remote_cache.time", timedelta_ms(remote_cache_time_delta))
statsd.incr(f"{statsd_path}.remote_cache.querycount", remote_cache_count_delta)
startup_output = ""
if "startup_time_delta" in log_data and log_data["startup_time_delta"] > 0.005:
startup_output = " (+start: {})".format(format_timedelta(log_data["startup_time_delta"]))
markdown_output = ""
if "markdown_time_start" in log_data:
markdown_time_delta = get_markdown_time() - log_data["markdown_time_start"]
markdown_count_delta = get_markdown_requests() - log_data["markdown_requests_start"]
if "markdown_requests_stopped" in log_data:
# (now - restarted) + (stopped - start) = (now - start) + (stopped - restarted)
markdown_time_delta += (
log_data["markdown_time_stopped"] - log_data["markdown_time_restarted"]
)
markdown_count_delta += (
log_data["markdown_requests_stopped"] - log_data["markdown_requests_restarted"]
)
if markdown_time_delta > 0.005:
markdown_output = (
f" (md: {format_timedelta(markdown_time_delta)}/{markdown_count_delta})"
)
if not suppress_statsd:
statsd.timing(f"{statsd_path}.markdown.time", timedelta_ms(markdown_time_delta))
statsd.incr(f"{statsd_path}.markdown.count", markdown_count_delta)
# Get the amount of time spent doing database queries
db_time_output = ""
queries = connection.connection.queries if connection.connection is not None else []
if len(queries) > 0:
query_time = sum(float(query.get("time", 0)) for query in queries)
db_time_output = f" (db: {format_timedelta(query_time)}/{len(queries)}q)"
if not suppress_statsd:
# Log ms, db ms, and num queries to statsd
statsd.timing(f"{statsd_path}.dbtime", timedelta_ms(query_time))
statsd.incr(f"{statsd_path}.dbq", len(queries))
statsd.timing(f"{statsd_path}.total", timedelta_ms(time_delta))
if "extra" in log_data:
extra_request_data = " {}".format(log_data["extra"])
else:
extra_request_data = ""
if client_version is None:
logger_client = f"({requestor_for_logs} via {client_name})"
else:
logger_client = f"({requestor_for_logs} via {client_name}/{client_version})"
logger_timing = f"{format_timedelta(time_delta):>5}{optional_orig_delta}{remote_cache_output}{markdown_output}{db_time_output}{startup_output} {path}"
logger_line = f"{remote_ip:<15} {method:<7} {status_code:3} {logger_timing}{extra_request_data} {logger_client}"
if status_code in [200, 304] and method == "GET" and path.startswith("/static"):
logger.debug(logger_line)
else:
logger.info(logger_line)
if is_slow_query(time_delta, path):
slow_query_logger.info(logger_line)
if settings.PROFILE_ALL_REQUESTS:
log_data["prof"].disable()
profile_path = "/tmp/profile.data.{}.{}".format(path.split("/")[-1], int(time_delta * 1000))
log_data["prof"].dump_stats(profile_path)
# Log some additional data whenever we return certain 40x errors
if 400 <= status_code < 500 and status_code not in [401, 404, 405]:
assert error_content_iter is not None
error_content_list = list(error_content_iter)
if not error_content_list:
error_data = ""
elif isinstance(error_content_list[0], str):
error_data = "".join(error_content_list)
elif isinstance(error_content_list[0], bytes):
error_data = repr(b"".join(error_content_list))
if len(error_data) > 200:
error_data = "[content more than 200 characters]"
logger.info("status=%3d, data=%s, uid=%s", status_code, error_data, requestor_for_logs)
class RequestContext(MiddlewareMixin):
def __call__(self, request: HttpRequest) -> HttpResponse:
set_request(request)
try:
return self.get_response(request)
finally:
unset_request()
def parse_client(request: HttpRequest) -> Tuple[str, Optional[str]]:
# If the API request specified a client in the request content,
# that has priority. Otherwise, extract the client from the
# User-Agent.
if "client" in request.GET: # nocoverage
return request.GET["client"], None
if "client" in request.POST:
return request.POST["client"], None
if "HTTP_USER_AGENT" in request.META:
user_agent: Optional[Dict[str, str]] = parse_user_agent(request.META["HTTP_USER_AGENT"])
else:
user_agent = None
if user_agent is None:
# In the future, we will require setting USER_AGENT, but for
# now we just want to tag these requests so we can review them
# in logs and figure out the extent of the problem
return "Unspecified", None
client_name = user_agent["name"]
if client_name.startswith("Zulip"):
return client_name, user_agent.get("version")
# We could show browser versions in logs, and it'd probably be a
# good idea, but the current parsing will just get you Mozilla/5.0.
#
# Fixing this probably means using a third-party library, and
# making sure it's fast enough that we're happy to do it even on
# hot-path cases.
return client_name, None
class LogRequests(MiddlewareMixin):
# We primarily are doing logging using the process_view hook, but
# for some views, process_view isn't run, so we call the start
# method here too
def process_request(self, request: HttpRequest) -> None:
maybe_tracemalloc_listen()
request_notes = RequestNotes.get_notes(request)
if request_notes.log_data is not None:
# Sanity check to ensure this is being called from the
# Tornado code path that returns responses asynchronously.
assert request_notes.saved_response is not None
# Avoid re-initializing request_notes.log_data if it's already there.
return
request_notes.client_name, request_notes.client_version = parse_client(request)
request_notes.log_data = {}
record_request_start_data(request_notes.log_data)
def process_view(
self,
request: HttpRequest,
view_func: ViewFuncT,
args: List[str],
kwargs: Dict[str, Any],
) -> None:
request_notes = RequestNotes.get_notes(request)
if request_notes.saved_response is not None:
# The below logging adjustments are unnecessary (because
# we've already imported everything) and incorrect
# (because they'll overwrite data from pre-long-poll
# request processing) when returning a saved response.
return
# process_request was already run; we save the initialization
# time (i.e. the time between receiving the request and
# figuring out which view function to call, which is primarily
# importing modules on the first start)
assert request_notes.log_data is not None
request_notes.log_data["startup_time_delta"] = (
time.time() - request_notes.log_data["time_started"]
)
# And then completely reset our tracking to only cover work
# done as part of this request
record_request_start_data(request_notes.log_data)
def process_response(
self, request: HttpRequest, response: HttpResponseBase
) -> HttpResponseBase:
if getattr(response, "asynchronous", False):
# This special Tornado "asynchronous" response is
# discarded after going through this code path as Tornado
# intends to block, so we stop here to avoid unnecessary work.
return response
remote_ip = request.META["REMOTE_ADDR"]
# Get the requestor's identifier and client, if available.
request_notes = RequestNotes.get_notes(request)
requestor_for_logs = request_notes.requestor_for_logs
if requestor_for_logs is None:
# Note that request.user is a Union[RemoteZulipServer, UserProfile, AnonymousUser],
# if it is present.
if hasattr(request, "user") and hasattr(request.user, "format_requestor_for_logs"):
requestor_for_logs = request.user.format_requestor_for_logs()
else:
requestor_for_logs = "unauth@{}".format(get_subdomain(request) or "root")
if response.streaming:
assert isinstance(response, StreamingHttpResponse)
content_iter: Optional[Iterator[bytes]] = response.streaming_content
content = None
else:
content = response.content
content_iter = None
assert request_notes.client_name is not None and request_notes.log_data is not None
write_log_line(
request_notes.log_data,
request.path,
request.method,
remote_ip,
requestor_for_logs,
request_notes.client_name,
client_version=request_notes.client_version,
status_code=response.status_code,
error_content=content,
error_content_iter=content_iter,
)
return response
class JsonErrorHandler(MiddlewareMixin):
def __init__(self, get_response: Callable[[HttpRequest], HttpResponse]) -> None:
super().__init__(get_response)
ignore_logger("zerver.middleware.json_error_handler")
def process_exception(
self, request: HttpRequest, exception: Exception
) -> Optional[HttpResponse]:
if isinstance(exception, MissingAuthenticationError):
if "text/html" in request.META.get("HTTP_ACCEPT", ""):
# If this looks like a request from a top-level page in a
# browser, send the user to the login page.
#
# TODO: The next part is a bit questionable; it will
# execute the likely intent for intentionally visiting
# an API endpoint without authentication in a browser,
# but that's an unlikely to be done intentionally often.
return HttpResponseRedirect(f"{settings.HOME_NOT_LOGGED_IN}?next={request.path}")
if request.path.startswith("/api"):
# For API routes, ask for HTTP basic auth (email:apiKey).
return json_unauthorized()
else:
# For /json routes, ask for session authentication.
return json_unauthorized(www_authenticate="session")
if isinstance(exception, JsonableError):
return json_response_from_error(exception)
if RequestNotes.get_notes(request).error_format == "JSON":
capture_exception(exception)
json_error_logger = logging.getLogger("zerver.middleware.json_error_handler")
json_error_logger.error(traceback.format_exc(), extra=dict(request=request))
return json_response(res_type="error", msg=_("Internal server error"), status=500)
return None
class TagRequests(MiddlewareMixin):
def process_view(
self, request: HttpRequest, view_func: ViewFuncT, args: List[str], kwargs: Dict[str, Any]
) -> None:
self.process_request(request)
def process_request(self, request: HttpRequest) -> None:
if request.path.startswith("/api/") or request.path.startswith("/json/"):
RequestNotes.get_notes(request).error_format = "JSON"
else:
RequestNotes.get_notes(request).error_format = "HTML"
class CsrfFailureError(JsonableError):
http_status_code = 403
code = ErrorCode.CSRF_FAILED
data_fields = ["reason"]
def __init__(self, reason: str) -> None:
self.reason: str = reason
@staticmethod
def msg_format() -> str:
return _("CSRF error: {reason}")
def csrf_failure(request: HttpRequest, reason: str = "") -> HttpResponse:
if RequestNotes.get_notes(request).error_format == "JSON":
return json_response_from_error(CsrfFailureError(reason))
else:
return html_csrf_failure(request, reason)
class LocaleMiddleware(DjangoLocaleMiddleware):
def process_response(
self, request: HttpRequest, response: HttpResponseBase
) -> HttpResponseBase:
# This is the same as the default LocaleMiddleware, minus the
# logic that redirects 404's that lack a prefixed language in
# the path into having a language. See
# https://code.djangoproject.com/ticket/32005
language = translation.get_language()
language_from_path = translation.get_language_from_path(request.path_info)
urlconf = getattr(request, "urlconf", settings.ROOT_URLCONF)
i18n_patterns_used, _ = is_language_prefix_patterns_used(urlconf)
if not (i18n_patterns_used and language_from_path):
patch_vary_headers(response, ("Accept-Language",))
assert language is not None
response.setdefault("Content-Language", language)
# An additional responsibility of our override of this middleware is to save the user's language
# preference in a cookie. That determination is made by code handling the request
# and saved in the set_language flag so that it can be used here.
set_language = RequestNotes.get_notes(request).set_language
if set_language is not None:
response.set_cookie(settings.LANGUAGE_COOKIE_NAME, set_language)
return response
class RateLimitMiddleware(MiddlewareMixin):
def set_response_headers(
self, response: HttpResponse, rate_limit_results: List[RateLimitResult]
) -> None:
# The limit on the action that was requested is the minimum of the limits that get applied:
limit = min(result.entity.max_api_calls() for result in rate_limit_results)
response["X-RateLimit-Limit"] = str(limit)
# Same principle applies to remaining API calls:
remaining_api_calls = min(result.remaining for result in rate_limit_results)
response["X-RateLimit-Remaining"] = str(remaining_api_calls)
# The full reset time is the maximum of the reset times for the limits that get applied:
reset_time = time.time() + max(result.secs_to_freedom for result in rate_limit_results)
response["X-RateLimit-Reset"] = str(int(reset_time))
def process_response(self, request: HttpRequest, response: HttpResponse) -> HttpResponse:
if not settings.RATE_LIMITING:
return response
# Add X-RateLimit-*** headers
ratelimits_applied = RequestNotes.get_notes(request).ratelimits_applied
if len(ratelimits_applied) > 0:
self.set_response_headers(response, ratelimits_applied)
return response
class FlushDisplayRecipientCache(MiddlewareMixin):
def process_response(self, request: HttpRequest, response: HttpResponse) -> HttpResponse:
# We flush the per-request caches after every request, so they
# are not shared at all between requests.
flush_per_request_caches()
return response
class HostDomainMiddleware(MiddlewareMixin):
def process_request(self, request: HttpRequest) -> Optional[HttpResponse]:
# Match against ALLOWED_HOSTS, which is rather permissive;
# failure will raise DisallowedHost, which is a 400.
request.get_host()
# This check is important to avoid doing the extra work of
# `get_realm` (which does a database query that could be
# problematic for Tornado). Also the error page below is only
# appropriate for a page visited in a browser, not the API.
#
# API authentication will end up checking for an invalid
# realm, and throw a JSON-format error if appropriate.
if request.path.startswith(("/static/", "/api/", "/json/")):
return None
subdomain = get_subdomain(request)
if subdomain == settings.SOCIAL_AUTH_SUBDOMAIN:
# Realms are not supposed to exist on SOCIAL_AUTH_SUBDOMAIN.
return None
request_notes = RequestNotes.get_notes(request)
try:
request_notes.realm = get_realm(subdomain)
request_notes.has_fetched_realm = True
except Realm.DoesNotExist:
if subdomain == Realm.SUBDOMAIN_FOR_ROOT_DOMAIN:
# The root domain is used for creating new
# organizations even if it does not host a realm.
return None
return render(request, "zerver/invalid_realm.html", status=404)
return None
class SetRemoteAddrFromRealIpHeader(MiddlewareMixin):
"""Middleware that sets REMOTE_ADDR based on the X-Real-Ip header.
This middleware is similar to Django's old
SetRemoteAddrFromForwardedFor middleware. We use X-Real-Ip, and
not X-Forwarded-For, because the latter is a list of proxies, some
number of which are trusted by us, and some of which could be
arbitrarily set by the user. nginx has already parsed which are
which, and has set X-Real-Ip to the first one, going right to
left, which is untrusted.
Since we are always deployed behind nginx, we can trust the
X-Real-Ip which is so set. In development, we fall back to the
REMOTE_ADDR supplied by the server.
"""
def process_request(self, request: HttpRequest) -> None:
try:
real_ip = request.META["HTTP_X_REAL_IP"]
except KeyError:
return None
else:
request.META["REMOTE_ADDR"] = real_ip
def alter_content(request: HttpRequest, content: bytes) -> bytes:
first_paragraph_text = get_content_description(content, request)
placeholder_open_graph_description = RequestNotes.get_notes(
request
).placeholder_open_graph_description
assert placeholder_open_graph_description is not None
return content.replace(
placeholder_open_graph_description.encode(),
first_paragraph_text.encode(),
)
class FinalizeOpenGraphDescription(MiddlewareMixin):
def process_response(
self, request: HttpRequest, response: StreamingHttpResponse
) -> StreamingHttpResponse:
if RequestNotes.get_notes(request).placeholder_open_graph_description is not None:
assert not response.streaming
response.content = alter_content(request, response.content)
return response
class ZulipCommonMiddleware(CommonMiddleware):
"""
Patched version of CommonMiddleware to disable the APPEND_SLASH
redirect behavior inside Tornado.
While this has some correctness benefit in encouraging clients
to implement the API correctly, this also saves about 600us in
the runtime of every GET /events query, as the APPEND_SLASH
route resolution logic is surprisingly expensive.
TODO: We should probably extend this behavior to apply to all of
our API routes. The APPEND_SLASH behavior is really only useful
for non-API endpoints things like /login. But doing that
transition will require more careful testing.
"""
def should_redirect_with_slash(self, request: HttpRequest) -> bool:
if settings.RUNNING_INSIDE_TORNADO:
return False
return super().should_redirect_with_slash(request)
def validate_scim_bearer_token(request: HttpRequest) -> Optional[SCIMClient]:
"""
This function verifies the request is allowed to make SCIM requests on this subdomain,
by checking the provided bearer token and ensuring it matches a scim client configured
for this subdomain in settings.SCIM_CONFIG.
If successful, returns the corresponding SCIMClient object. Returns None otherwise.
"""
subdomain = get_subdomain(request)
scim_config_dict = settings.SCIM_CONFIG.get(subdomain)
if not scim_config_dict:
return None
valid_bearer_token = scim_config_dict.get("bearer_token")
scim_client_name = scim_config_dict.get("scim_client_name")
# We really don't want a misconfiguration where this is unset,
# allowing free access to the SCIM API:
assert valid_bearer_token
assert scim_client_name
if request.headers.get("Authorization") != f"Bearer {valid_bearer_token}":
return None
request_notes = RequestNotes.get_notes(request)
assert request_notes.realm
# While API authentication code paths are sufficiently high
# traffic that we prefer to use a cache, SCIM is much lower
# traffic, and doing a database query is plenty fast.
return SCIMClient.objects.get(realm=request_notes.realm, name=scim_client_name)
class ZulipSCIMAuthCheckMiddleware(SCIMAuthCheckMiddleware):
"""
Overridden version of middleware implemented in django-scim2
(https://github.com/15five/django-scim2/blob/master/src/django_scim/middleware.py)
to also handle authenticating the client.
"""
def process_request(self, request: HttpRequest) -> Optional[HttpResponse]:
# This determines whether this is a SCIM request based on the request's path
# and if it is, logs request information, including the body, as well as the response
# for debugging purposes to the `django_scim.middleware` logger, at DEBUG level.
# We keep those logs in /var/log/zulip/scim.log
if self.should_log_request(request):
self.log_request(request)
# Here we verify the request is indeed to a SCIM endpoint. That's ensured
# by comparing the path with self.reverse_url, which is the root SCIM path /scim/b2/.
# Of course we don't want to proceed with authenticating the request for SCIM
# if a non-SCIM endpoint is being queried.
if not request.path.startswith(self.reverse_url):
return None
scim_client = validate_scim_bearer_token(request)
if not scim_client:
response = HttpResponse(status=401)
response["WWW-Authenticate"] = scim_settings.WWW_AUTHENTICATE_HEADER
return response
# The client has been successfully authenticated for SCIM on this subdomain,
# so we can assign the corresponding SCIMClient object to request.user - which
# will allow this request to pass request.user.is_authenticated checks from now on,
# to be served by the relevant views implemented in django-scim2.
request.user = scim_client
return None
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