Implement login and logout through cookie sessions

musician/api.py

@@ -1,3 +1,4 @@
+import requests
 import urllib.parse
 
 from django.conf import settings
@@ -16,9 +17,48 @@ API_PATHS = {
 }
 
 
-def build_absolute_uri(path_name):
-    path = API_PATHS.get(path_name, None)
-    if path is None:
-        raise NoReverseMatch("Not found API path name '{}'".format(path_name))
+class Orchestra(object):
+    def __init__(self, *args, username=None, password=None, **kwargs):
+        self.base_url = kwargs.pop('base_url', settings.API_BASE_URL)
+        self.username = username
+        self.session = requests.Session()
+        self.auth_token = kwargs.pop("auth_token", None)
 
-    return urllib.parse.urljoin(settings.API_BASE_URL, path)
+        if self.auth_token is None:
+            self.auth_token = self.authenticate(self.username, password)
+
+    def build_absolute_uri(self, path_name):
+        path = API_PATHS.get(path_name, None)
+        if path is None:
+            raise NoReverseMatch(
+                "Not found API path name '{}'".format(path_name))
+
+        return urllib.parse.urljoin(self.base_url, path)
+
+    def authenticate(self, username, password):
+        url = self.build_absolute_uri('token-auth')
+        response = self.session.post(
+            url,
+            data={"username": username, "password": password},
+        )
+
+        return response.json().get("token", None)
+
+    def request(self, verb, resource):
+        assert verb in ["HEAD", "GET", "POST", "PATCH", "PUT", "DELETE"]
+        url = self.build_absolute_uri(resource)
+
+        verb = getattr(self.session, verb.lower())
+        response = verb(url, headers={"Authorization": "Token {}".format(
+            self.auth_token)}, allow_redirects=False)
+
+        response.raise_for_status()
+
+        status = response.status_code
+        output = response.json()
+
+        return status, output
+
+    def retrieve_domains(self):
+        status, output = self.request("GET", 'domain-list')
+        return output

musician/auth.py

@@ -0,0 +1,38 @@
+from django.middleware.csrf import rotate_token
+from django.utils.crypto import constant_time_compare
+
+SESSION_KEY_TOKEN = '_auth_token'
+SESSION_KEY_USERNAME = '_auth_username'
+
+
+def login(request, username, token):
+    """
+    Persist a user id and a backend in the request. This way a user doesn't
+    have to reauthenticate on every request. Note that data set during
+    the anonymous session is retained when the user logs in.
+    """
+    if SESSION_KEY_TOKEN in request.session:
+        if request.session[SESSION_KEY_USERNAME] != username:
+            # To avoid reusing another user's session, create a new, empty
+            # session if the existing session corresponds to a different
+            # authenticated user.
+            request.session.flush()
+    else:
+        request.session.cycle_key()
+
+    request.session[SESSION_KEY_TOKEN] = token
+    request.session[SESSION_KEY_USERNAME] = username
+    # if hasattr(request, 'user'):
+    #     request.user = user
+    rotate_token(request)
+
+
+def logout(request):
+    """
+    Remove the authenticated user's ID from the request and flush their session
+    data.
+    """
+    request.session.flush()
+    # if hasattr(request, 'user'):
+    #     from django.contrib.auth.models import AnonymousUser
+    #     request.user = AnonymousUser()

musician/forms.py

@@ -1,22 +1,8 @@
-import urllib.parse
 
-import requests
 from django.contrib.auth.forms import AuthenticationForm
 
 from . import api
 
-
-def authenticate(username, password):
-    url = api.build_absolute_uri('token-auth')
-    r = requests.post(
-        url,
-        data={"username": username, "password": password},
-    )
-
-    token = r.json().get("token", None)
-    return token
-
-
 class LoginForm(AuthenticationForm):
 
     def clean(self):
@@ -24,10 +10,12 @@ class LoginForm(AuthenticationForm):
         password = self.cleaned_data.get('password')
 
         if username is not None and password:
-            self.token = authenticate(username, password)
-            if self.token is None:
+            orchestra = api.Orchestra(username=username, password=password)
+
+            if orchestra.auth_token is None:
                 raise self.get_invalid_login_error()
             else:
-                return self.token
+                self.username = username
+                self.token = orchestra.auth_token
 
         return self.cleaned_data

musician/templates/musician/base.html

@@ -51,7 +51,7 @@
           </li>
           <div class="dropdown-divider"></div>
           <li class="nav-item">
-            <a class="nav-link" href="#logout">{% trans 'Log out' %}</a>
+            <a class="nav-link" href="{% url 'musician:logout' %}">{% trans 'Log out' %}</a>
           </li>
         </ul>
     

musician/urls.py

@@ -13,6 +13,6 @@ app_name = 'musician'
 
 urlpatterns = [
     path('auth/login/', views.LoginView.as_view(), name='login'),
-    # path('auth/logout/', views.LogoutView.as_view(), name='logout'),
+    path('auth/logout/', views.LogoutView.as_view(), name='logout'),
     path('dashboard/', views.DashboardView.as_view(), name='dashboard'),
 ]

musician/views.py

@@ -1,10 +1,12 @@
 from django.contrib.auth.mixins import LoginRequiredMixin
+from django.http import HttpResponseRedirect
 from django.shortcuts import render
 from django.urls import reverse_lazy
-from django.views.generic.base import TemplateView
+from django.views.generic.base import RedirectView, TemplateView
 from django.views.generic.edit import FormView
 
 from . import api, get_version
+from .auth import login as auth_login, logout as auth_logout
 from .forms import LoginForm
 from .mixins import CustomContextMixin
 
@@ -18,3 +20,32 @@ class LoginView(FormView):
     form_class = LoginForm
     success_url = reverse_lazy('musician:dashboard')
     extra_context = {'version': get_version()}
+
+    def get_form_kwargs(self):
+        kwargs = super().get_form_kwargs()
+        kwargs['request'] = self.request
+        return kwargs
+
+    def form_valid(self, form):
+        """Security check complete. Log the user in."""
+        auth_login(self.request, form.username, form.token)
+        return HttpResponseRedirect(self.get_success_url())
+
+
+class LogoutView(RedirectView):
+    """
+    Log out the user.
+    """
+    permanent = False
+    pattern_name = 'musician:login'
+
+    def get_redirect_url(self, *args, **kwargs):
+        """
+        Logs out the user.
+        """
+        auth_logout(self.request)
+        return super().get_redirect_url(*args, **kwargs)
+
+    def post(self, request, *args, **kwargs):
+        """Logout may be done via POST."""
+        return self.get(request, *args, **kwargs)

userpanel/settings.py

@@ -114,6 +114,14 @@ AUTH_PASSWORD_VALIDATORS = [
     },
 ]
 
+LOGIN_URL = '/auth/login/'
+
+# Sessions
+# https://docs.djangoproject.com/en/2.2/topics/http/sessions/#configuring-sessions
+
+SESSION_ENGINE = "django.contrib.sessions.backends.signed_cookies"
+
+# SESSION_COOKIE_SECURE = True
 
 # Internationalization
 # https://docs.djangoproject.com/en/2.2/topics/i18n/