Implement post rate limits, move to signed cookies

Also improve the test harness a little
Fixes #112

11 files changed, 112 insertions, 57 deletions

diff --git a/activities/views/compose.py b/activities/views/compose.py
index 8e3c96d..6889864 100644
--- a/activities/views/compose.py
+++ b/activities/views/compose.py
@@ -2,6 +2,7 @@ from django import forms
 from django.conf import settings
 from django.core.exceptions import PermissionDenied
 from django.shortcuts import get_object_or_404, redirect, render
+from django.utils import timezone
 from django.utils.decorators import method_decorator
 from django.views.generic import FormView
 
@@ -54,8 +55,9 @@ class Compose(FormView):
         )
         reply_to = forms.CharField(widget=forms.HiddenInput(), required=False)
 
-        def __init__(self, *args, **kwargs):
+        def __init__(self, request, *args, **kwargs):
             super().__init__(*args, **kwargs)
+            self.request = request
             self.fields["text"].widget.attrs[
                 "_"
             ] = f"""
@@ -74,8 +76,20 @@ class Compose(FormView):
 
         def clean_text(self):
             text = self.cleaned_data.get("text")
+            # Check minimum interval
+            last_post = self.request.identity.posts.order_by("-created").first()
+            if (
+                last_post
+                and (timezone.now() - last_post.created).total_seconds()
+                < Config.system.post_minimum_interval
+            ):
+                raise forms.ValidationError(
+                    f"You must wait at least {Config.system.post_minimum_interval} seconds between posts"
+                )
+            print(last_post)
             if not text:
                 return text
+            # Check post length
             length = len(text)
             if length > Config.system.post_length:
                 raise forms.ValidationError(
@@ -83,6 +97,9 @@ class Compose(FormView):
                 )
             return text
 
+    def get_form(self, form_class=None):
+        return self.form_class(request=self.request, **self.get_form_kwargs())
+
     def get_initial(self):
         initial = super().get_initial()
         if self.post_obj:
diff --git a/activities/views/timelines.py b/activities/views/timelines.py
index f55e331..d797cfd 100644
--- a/activities/views/timelines.py
+++ b/activities/views/timelines.py
@@ -17,6 +17,9 @@ class Home(FormView):
 
     form_class = Compose.form_class
 
+    def get_form(self, form_class=None):
+        return self.form_class(request=self.request, **self.get_form_kwargs())
+
     def get_context_data(self):
         context = super().get_context_data()
         context["events"] = list(
diff --git a/core/models/config.py b/core/models/config.py
index 9670c11..48da7de 100644
--- a/core/models/config.py
+++ b/core/models/config.py
@@ -216,6 +216,7 @@ class Config(models.Model):
         content_warning_text: str = "Content Warning"
 
         post_length: int = 500
+        post_minimum_interval: int = 3  # seconds
         identity_min_length: int = 2
         identity_max_per_user: int = 5
         identity_max_age: int = 24 * 60 * 60
diff --git a/takahe/settings.py b/takahe/settings.py
index 98bc9dd..3017293 100644
--- a/takahe/settings.py
+++ b/takahe/settings.py
@@ -282,6 +282,8 @@ STATICFILES_DIRS = [BASE_DIR / "static"]
 
 STATICFILES_STORAGE = "django.contrib.staticfiles.storage.ManifestStaticFilesStorage"
 
+SESSION_ENGINE = "django.contrib.sessions.backends.signed_cookies"
+
 WHITENOISE_MAX_AGE = 3600
 
 STATIC_ROOT = BASE_DIR / "static-collected"
diff --git a/tests/activities/templatetags/test_activity_tags.py b/tests/activities/templatetags/test_activity_tags.py
index 85d8cdf..9426337 100644
--- a/tests/activities/templatetags/test_activity_tags.py
+++ b/tests/activities/templatetags/test_activity_tags.py
@@ -5,7 +5,10 @@ from django.utils import timezone
 from activities.templatetags.activity_tags import linkify_hashtags, timedeltashort
 
 
-def test_timedeltashort_regress():
+def test_timedeltashort():
+    """
+    Tests that timedeltashort works correctly
+    """
     assert timedeltashort(None) == ""
     assert timedeltashort("") == ""
 
@@ -21,7 +24,11 @@ def test_timedeltashort_regress():
     assert timedeltashort(value - timedelta(days=366)) == "1y"
 
 
-def test_linkify_hashtags_regres():
+def test_linkify_hashtags():
+    """
+    Tests that linkify_hashtags works correctly
+    """
+
     assert linkify_hashtags(None) == ""
     assert linkify_hashtags("") == ""
 
diff --git a/tests/activities/views/test_compose.py b/tests/activities/views/test_compose.py
index 2b8c4ea..2fdec3a 100644
--- a/tests/activities/views/test_compose.py
+++ b/tests/activities/views/test_compose.py
@@ -1,46 +1,58 @@
-import re
-from unittest import mock
-
 import pytest
-from django.core.exceptions import PermissionDenied
+from django.test.client import Client
+from pytest_django.asserts import assertContains
 
 from activities.models import Post
-from activities.views.compose import Compose
+from core.models import Config
+from users.models import Identity
 
 
 @pytest.mark.django_db
-def test_content_warning_text(identity, user, rf, config_system):
-    request = rf.get("/compose/")
-    request.user = user
-    request.identity = identity
-
+def test_content_warning_text(
+    client_with_identity: Client,
+    config_system: Config.SystemOptions,
+):
+    """
+    Tests that changing the content warning name works
+    """
     config_system.content_warning_text = "Content Summary"
-    with mock.patch("core.models.Config.load_system", return_value=config_system):
-        view = Compose.as_view()
-        resp = view(request)
-        assert resp.status_code == 200
-        content = str(resp.rendered_content)
-        assert 'placeholder="Content Summary"' in content
-        assert re.search(
-            r"<label.*>\s*Content Summary\s*</label>", content, flags=re.MULTILINE
-        )
+    response = client_with_identity.get("/compose/")
+    assertContains(response, 'placeholder="Content Summary"', status_code=200)
+    assertContains(
+        response, "<label for='id_content_warning'>Content Summary</label>", html=True
+    )
 
 
 @pytest.mark.django_db
-def test_post_edit_security(identity, user, rf, other_identity):
-    # Create post
+def test_post_edit_security(client_with_identity: Client, other_identity: Identity):
+    """
+    Tests that you can't edit other users' posts with URL fiddling
+    """
     other_post = Post.objects.create(
         content="<p>OTHER POST!</p>",
         author=other_identity,
         local=True,
         visibility=Post.Visibilities.public,
     )
+    response = client_with_identity.get(other_post.urls.action_edit)
+    assert response.status_code == 403
 
-    request = rf.get(other_post.get_absolute_url() + "edit/")
-    request.user = user
-    request.identity = identity
 
-    view = Compose.as_view()
-    with pytest.raises(PermissionDenied) as ex:
-        view(request, handle=other_identity.handle.lstrip("@"), post_id=other_post.id)
-    assert str(ex.value) == "Post author is not requestor"
+@pytest.mark.django_db
+def test_rate_limit(identity: Identity, client_with_identity: Client):
+    """
+    Tests that the posting rate limit comes into force
+    """
+    # First post should go through
+    assert identity.posts.count() == 0
+    response = client_with_identity.post(
+        "/compose/", data={"text": "post 1", "visibility": "0"}
+    )
+    assert response.status_code == 302
+    assert identity.posts.count() == 1
+    # Second should not
+    response = client_with_identity.post(
+        "/compose/", data={"text": "post 2", "visibility": "0"}
+    )
+    assertContains(response, "You must wait at least", status_code=200)
+    assert identity.posts.count() == 1
diff --git a/tests/activities/views/test_posts.py b/tests/activities/views/test_posts.py
index ac148d0..a3dbc64 100644
--- a/tests/activities/views/test_posts.py
+++ b/tests/activities/views/test_posts.py
@@ -1,25 +1,20 @@
 import pytest
-from django.core.exceptions import PermissionDenied
+from django.test.client import Client
 
 from activities.models import Post
-from activities.views.posts import Delete
+from users.models import Identity
 
 
 @pytest.mark.django_db
-def test_post_delete_security(identity, user, rf, other_identity):
-    # Create post
+def test_post_delete_security(client_with_identity: Client, other_identity: Identity):
+    """
+    Tests that you can't delete other users' posts with URL fiddling
+    """
     other_post = Post.objects.create(
         content="<p>OTHER POST!</p>",
         author=other_identity,
         local=True,
         visibility=Post.Visibilities.public,
     )
-
-    request = rf.post(other_post.get_absolute_url() + "delete/")
-    request.user = user
-    request.identity = identity
-
-    view = Delete.as_view()
-    with pytest.raises(PermissionDenied) as ex:
-        view(request, handle=other_identity.handle.lstrip("@"), post_id=other_post.id)
-    assert str(ex.value) == "Post author is not requestor"
+    response = client_with_identity.get(other_post.urls.action_delete)
+    assert response.status_code == 403
diff --git a/tests/activities/views/test_timelines.py b/tests/activities/views/test_timelines.py
index 74bf43d..a2cbb32 100644
--- a/tests/activities/views/test_timelines.py
+++ b/tests/activities/views/test_timelines.py
@@ -1,19 +1,12 @@
-from unittest import mock
-
 import pytest
 
-from activities.views.timelines import Home
-
 
 @pytest.mark.django_db
-def test_content_warning_text(identity, user, rf, config_system):
-    request = rf.get("/")
-    request.user = user
-    request.identity = identity
+def test_content_warning_text(client_with_identity, config_system):
 
     config_system.content_warning_text = "Content Summary"
-    with mock.patch("core.models.Config.load_system", return_value=config_system):
-        view = Home.as_view()
-        resp = view(request)
-        assert resp.status_code == 200
-        assert 'placeholder="Content Summary"' in str(resp.rendered_content)
+
+    response = client_with_identity.get("/")
+
+    assert response.status_code == 200
+    assert 'placeholder="Content Summary"' in str(response.rendered_content)
diff --git a/tests/conftest.py b/tests/conftest.py
index 9127466..a86f2f3 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,6 +1,7 @@
 import time
 
 import pytest
+from django.conf import settings
 
 from activities.models import Emoji
 from api.models import Application, Token
@@ -74,6 +75,19 @@ def config_system(keypair):
 
 
 @pytest.fixture
+def client_with_identity(client, identity, user):
+    """
+    Provides a logged-in test client with an identity selected
+    """
+    client.force_login(user)
+    session = client.session
+    session["identity_id"] = identity.id
+    session.save()
+    client.cookies[settings.SESSION_COOKIE_NAME] = session.session_key
+    return client
+
+
+@pytest.fixture
 @pytest.mark.django_db
 def emoji_locals():
     Emoji.locals = Emoji.load_locals()
diff --git a/tests/users/views/test_domains.py b/tests/users/views/test_domains.py
index 13d4b11..5752125 100644
--- a/tests/users/views/test_domains.py
+++ b/tests/users/views/test_domains.py
@@ -31,10 +31,16 @@ INVALID_DOMAINS = [
 
 @pytest.mark.parametrize("domain", VALID_DOMAINS)
 def test_domain_validation_accepts_valid_domains(domain):
+    """
+    Tests that the domain validator works in positive cases
+    """
     DomainValidator()(domain)
 
 
 @pytest.mark.parametrize("domain", INVALID_DOMAINS)
 def test_domain_validation_raises_exception_for_invalid_domains(domain):
+    """
+    Tests that the domain validator works in negative cases
+    """
     with pytest.raises(ValidationError):
         DomainValidator()(domain)
diff --git a/users/views/admin/settings.py b/users/views/admin/settings.py
index b9e2543..4786d83 100644
--- a/users/views/admin/settings.py
+++ b/users/views/admin/settings.py
@@ -38,6 +38,10 @@ class BasicSettings(AdminSettingsPage):
             "title": "Maximum Post Length",
             "help_text": "The maximum number of characters allowed per post",
         },
+        "post_minimum_interval": {
+            "title": "Minimum Posting Interval",
+            "help_text": "The minimum number of seconds a user must wait between posts",
+        },
         "content_warning_text": {
             "title": "Content Warning Feature Name",
             "help_text": "What the feature that lets users provide post summaries is called",
@@ -102,6 +106,7 @@ class BasicSettings(AdminSettingsPage):
         "Signups": ["signup_allowed", "signup_invite_only", "signup_text"],
         "Posts": [
             "post_length",
+            "post_minimum_interval",
             "content_warning_text",
             "hashtag_unreviewed_are_public",
             "emoji_unreviewed_are_public",