Merge branch 'master' into bot#549-show-attachments-staff

33 files changed, 2122 insertions, 38 deletions

diff --git a/Pipfile b/Pipfile
index f136a328..cb5776e0 100644
--- a/Pipfile
+++ b/Pipfile
@@ -43,6 +43,7 @@ unittest-xml-reporting = "~=2.5.1"
 python_version = "3.7"
 
 [scripts]
+start = "python manage.py run --debug"
 makemigrations = "python manage.py makemigrations"
 django_shell = "python manage.py shell"
 test = "coverage run manage.py test"
diff --git a/pydis_site/__init__.py b/pydis_site/__init__.py
index c6146450..df67cf71 100644
--- a/pydis_site/__init__.py
+++ b/pydis_site/__init__.py
@@ -2,3 +2,8 @@ from wiki.plugins.macros.mdx import toc
 
 # Remove the toc header prefix. There's no option for this, so we gotta monkey patch it.
 toc.HEADER_ID_PREFIX = ''
+
+# Empty list of validators for Allauth to ponder over. This is referred to in settings.py
+# by a string because Allauth won't let us just give it a list _there_, we have to point
+# at a list _somewhere else_ instead.
+VALIDATORS = []
diff --git a/pydis_site/apps/api/migrations/0047_active_infractions_migration.py b/pydis_site/apps/api/migrations/0047_active_infractions_migration.py
new file mode 100644
index 00000000..9ac791dc
--- /dev/null
+++ b/pydis_site/apps/api/migrations/0047_active_infractions_migration.py
@@ -0,0 +1,105 @@
+# Generated by Django 2.2.6 on 2019-10-07 15:59
+
+from django.db import migrations
+from django.db.models import Count, Prefetch, QuerySet
+
+
+class ExpirationWrapper:
+    """Wraps an expiration date to properly compare permanent and temporary infractions."""
+
+    def __init__(self, infraction):
+        self.expiration_date = infraction.expires_at
+
+    def __lt__(self, other):
+        """An `expiration_date` is considered smaller when it comes earlier than the `other`."""
+        if self.expiration_date is None:
+            # A permanent infraction can never end sooner than another infraction
+            return False
+        elif other.expiration_date is None:
+            # If `self` is temporary, but `other` is permanent, `self` is smaller
+            return True
+        else:
+            return self.expiration_date < other.expiration_date
+
+    def __eq__(self, other):
+        """If both expiration dates are permanent they're equal, otherwise compare dates."""
+        if self.expiration_date is None and other.expiration_date is None:
+            return True
+        elif self.expiration_date is None or other.expiration_date is None:
+            return False
+        else:
+            return self.expiration_date == other.expiration_date
+
+
+def migrate_inactive_types_to_inactive(apps, schema_editor):
+    """Migrates infractions of non-active types to inactive."""
+    infraction_model = apps.get_model('api', 'Infraction')
+    infraction_model.objects.filter(type__in=('note', 'warning', 'kick')).update(active=False)
+
+
+def get_query(user_model, infraction_model, infr_type: str) -> QuerySet:
+    """
+    Creates QuerySet to fetch users with multiple active infractions of the given `type`.
+
+    The QuerySet will prefetch the infractions and attach them as an `.infractions` attribute to the
+    `User` instances.
+    """
+    active_infractions = infraction_model.objects.filter(type=infr_type, active=True)
+
+    # Build an SQL query by chaining methods together
+
+    # Get users with active infraction(s) of the provided `infr_type`
+    query = user_model.objects.filter(
+        infractions_received__type=infr_type, infractions_received__active=True
+    )
+
+    # Prefetch their active received infractions of `infr_type` and attach `.infractions` attribute
+    query = query.prefetch_related(
+        Prefetch('infractions_received', queryset=active_infractions, to_attr='infractions')
+    )
+
+    # Count and only include them if they have at least 2 active infractions of the `type`
+    query = query.annotate(num_infractions=Count('infractions_received'))
+    query = query.filter(num_infractions__gte=2)
+
+    # Make sure we return each individual only once
+    query = query.distinct()
+
+    return query
+
+
+def migrate_multiple_active_infractions_per_user_to_one(apps, schema_editor):
+    """
+    Make sure a user only has one active infraction of a given "active" infraction type.
+
+    If a user has multiple active infraction, we keep the one with longest expiration date active
+    and migrate the others to inactive.
+    """
+    infraction_model = apps.get_model('api', 'Infraction')
+    user_model = apps.get_model('api', 'User')
+
+    for infraction_type in ('ban', 'mute', 'superstar', 'watch'):
+        query = get_query(user_model, infraction_model, infraction_type)
+        for user in query:
+            infractions = sorted(user.infractions, key=ExpirationWrapper, reverse=True)
+            for infraction in infractions[1:]:
+                infraction.active = False
+                infraction.save()
+
+
+def reverse_migration(apps, schema_editor):
+    """There's no need to do anything special to reverse these migrations."""
+    return
+
+
+class Migration(migrations.Migration):
+    """Data migration to get the database consistent with the new infraction validation rules."""
+
+    dependencies = [
+        ('api', '0046_reminder_jump_url'),
+    ]
+
+    operations = [
+        migrations.RunPython(migrate_inactive_types_to_inactive, reverse_migration),
+        migrations.RunPython(migrate_multiple_active_infractions_per_user_to_one, reverse_migration)
+    ]
diff --git a/pydis_site/apps/api/migrations/0048_add_infractions_unique_constraints_active.py b/pydis_site/apps/api/migrations/0048_add_infractions_unique_constraints_active.py
new file mode 100644
index 00000000..4ea1fb90
--- /dev/null
+++ b/pydis_site/apps/api/migrations/0048_add_infractions_unique_constraints_active.py
@@ -0,0 +1,17 @@
+# Generated by Django 2.2.6 on 2019-10-07 18:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0047_active_infractions_migration'),
+    ]
+
+    operations = [
+        migrations.AddConstraint(
+            model_name='infraction',
+            constraint=models.UniqueConstraint(condition=models.Q(active=True), fields=('user', 'type'), name='unique_active_infraction_per_type_per_user'),
+        ),
+    ]
diff --git a/pydis_site/apps/api/models/bot/infraction.py b/pydis_site/apps/api/models/bot/infraction.py
index dfb32a97..108fd3a2 100644
--- a/pydis_site/apps/api/models/bot/infraction.py
+++ b/pydis_site/apps/api/models/bot/infraction.py
@@ -71,3 +71,10 @@ class Infraction(ModelReprMixin, models.Model):
         """Defines the meta options for the infraction model."""
 
         ordering = ['-inserted_at']
+        constraints = (
+            models.UniqueConstraint(
+                fields=["user", "type"],
+                condition=models.Q(active=True),
+                name="unique_active_infraction_per_type_per_user"
+            ),
+        )
diff --git a/pydis_site/apps/api/models/bot/user.py b/pydis_site/apps/api/models/bot/user.py
index 21617dc4..5140d2bf 100644
--- a/pydis_site/apps/api/models/bot/user.py
+++ b/pydis_site/apps/api/models/bot/user.py
@@ -50,7 +50,7 @@ class User(ModelReprMixin, models.Model):
 
     def __str__(self):
         """Returns the name and discriminator for the current user, for display purposes."""
-        return f"{self.name}#{self.discriminator}"
+        return f"{self.name}#{self.discriminator:0>4}"
 
     @property
     def top_role(self) -> Role:
diff --git a/pydis_site/apps/api/serializers.py b/pydis_site/apps/api/serializers.py
index e091ff4f..2af04e0e 100644
--- a/pydis_site/apps/api/serializers.py
+++ b/pydis_site/apps/api/serializers.py
@@ -1,6 +1,6 @@
 """Converters from Django models to data interchange formats and back."""
-
 from rest_framework.serializers import ModelSerializer, PrimaryKeyRelatedField, ValidationError
+from rest_framework.validators import UniqueTogetherValidator
 from rest_framework_bulk import BulkSerializerMixin
 
 from .models import (
@@ -106,11 +106,22 @@ class InfractionSerializer(ModelSerializer):
         fields = (
             'id', 'inserted_at', 'expires_at', 'active', 'user', 'actor', 'type', 'reason', 'hidden'
         )
+        validators = [
+            UniqueTogetherValidator(
+                queryset=Infraction.objects.filter(active=True),
+                fields=['user', 'type'],
+                message='This user already has an active infraction of this type.',
+            )
+        ]
 
     def validate(self, attrs: dict) -> dict:
         """Validate data constraints for the given data and abort if it is invalid."""
         infr_type = attrs.get('type')
 
+        active = attrs.get('active')
+        if active and infr_type in ('note', 'warning', 'kick'):
+            raise ValidationError({'active': [f'{infr_type} infractions cannot be active.']})
+
         expires_at = attrs.get('expires_at')
         if expires_at and infr_type in ('kick', 'warning'):
             raise ValidationError({'expires_at': [f'{infr_type} infractions cannot expire.']})
diff --git a/pydis_site/apps/api/tests/migrations/__init__.py b/pydis_site/apps/api/tests/migrations/__init__.py
new file mode 100644
index 00000000..38e42ffc
--- /dev/null
+++ b/pydis_site/apps/api/tests/migrations/__init__.py
@@ -0,0 +1 @@
+"""This submodule contains tests for functions used in data migrations."""
diff --git a/pydis_site/apps/api/tests/migrations/base.py b/pydis_site/apps/api/tests/migrations/base.py
new file mode 100644
index 00000000..0c0a5bd0
--- /dev/null
+++ b/pydis_site/apps/api/tests/migrations/base.py
@@ -0,0 +1,102 @@
+"""Includes utilities for testing migrations."""
+from django.db import connection
+from django.db.migrations.executor import MigrationExecutor
+from django.test import TestCase
+
+
+class MigrationsTestCase(TestCase):
+    """
+    A `TestCase` subclass to test migration files.
+
+    To be able to properly test a migration, we will need to inject data into the test database
+    before the migrations we want to test are applied, but after the older migrations have been
+    applied. This makes sure that we are testing "as if" we were actually applying this migration
+    to a database in the state it was in before introducing the new migration.
+
+    To set up a MigrationsTestCase, create a subclass of this class and set the following
+    class-level attributes:
+
+    - app: The name of the app that contains the migrations (e.g., `'api'`)
+    - migration_prior: The name* of the last migration file before the migrations you want to test
+    - migration_target: The name* of the last migration file we want to test
+
+    *) Specify the file names without a path or the `.py` file extension.
+
+    Additionally, overwrite the `setUpMigrationData` in the subclass to inject data into the
+    database before the migrations we want to test are applied. Please read the docstring of the
+    method for more information. An optional hook, `setUpPostMigrationData` is also provided.
+    """
+
+    # These class-level attributes should be set in classes that inherit from this base class.
+    app = None
+    migration_prior = None
+    migration_target = None
+
+    @classmethod
+    def setUpTestData(cls):
+        """
+        Injects data into the test database prior to the migration we're trying to test.
+
+        This class methods reverts the test database back to the state of the last migration file
+        prior to the migrations we want to test. It will then allow the user to inject data into the
+        test database by calling the `setUpMigrationData` hook. After the data has been injected, it
+        will apply the migrations we want to test and call the `setUpPostMigrationData` hook. The
+        user can now test if the migration correctly migrated the injected test data.
+        """
+        if not cls.app:
+            raise ValueError("The `app` attribute was not set.")
+
+        if not cls.migration_prior or not cls.migration_target:
+            raise ValueError("Both ` migration_prior` and `migration_target` need to be set.")
+
+        cls.migrate_from = [(cls.app, cls.migration_prior)]
+        cls.migrate_to = [(cls.app, cls.migration_target)]
+
+        # Reverse to database state prior to the migrations we want to test
+        executor = MigrationExecutor(connection)
+        executor.migrate(cls.migrate_from)
+
+        # Call the data injection hook with the current state of the project
+        old_apps = executor.loader.project_state(cls.migrate_from).apps
+        cls.setUpMigrationData(old_apps)
+
+        # Run the migrations we want to test
+        executor = MigrationExecutor(connection)
+        executor.loader.build_graph()
+        executor.migrate(cls.migrate_to)
+
+        # Save the project state so we're able to work with the correct model states
+        cls.apps = executor.loader.project_state(cls.migrate_to).apps
+
+        # Call `setUpPostMigrationData` to potentially set up post migration data used in testing
+        cls.setUpPostMigrationData(cls.apps)
+
+    @classmethod
+    def setUpMigrationData(cls, apps):
+        """
+        Override this method to inject data into the test database before the migration is applied.
+
+        This method will be called after setting up the database according to the migrations that
+        come before the migration(s) we are trying to test, but before the to-be-tested migration(s)
+        are applied. This allows us to simulate a database state just prior to the migrations we are
+        trying to test.
+
+        To make sure we're creating objects according to the state the models were in at this point
+        in the migration history, use `apps.get_model(app_name: str, model_name: str)` to get the
+        appropriate model, e.g.:
+
+        >>> Infraction = apps.get_model('api', 'Infraction')
+        """
+        pass
+
+    @classmethod
+    def setUpPostMigrationData(cls, apps):
+        """
+        Set up additional test data after the target migration has been applied.
+
+        Use `apps.get_model(app_name: str, model_name: str)` to get the correct instances of the
+        model classes:
+
+        >>> Infraction = apps.get_model('api', 'Infraction')
+        """
+        pass
diff --git a/pydis_site/apps/api/tests/migrations/test_active_infraction_migration.py b/pydis_site/apps/api/tests/migrations/test_active_infraction_migration.py
new file mode 100644
index 00000000..8dc29b34
--- /dev/null
+++ b/pydis_site/apps/api/tests/migrations/test_active_infraction_migration.py
@@ -0,0 +1,496 @@
+"""Tests for the data migration in `filename`."""
+import logging
+from collections import ChainMap, namedtuple
+from datetime import timedelta
+from itertools import count
+from typing import Dict, Iterable, Type, Union
+
+from django.db.models import Q
+from django.forms.models import model_to_dict
+from django.utils import timezone
+
+from pydis_site.apps.api.models import Infraction, User
+from .base import MigrationsTestCase
+
+log = logging.getLogger(__name__)
+log.setLevel(logging.DEBUG)
+
+
+InfractionHistory = namedtuple('InfractionHistory', ("user_id", "infraction_history"))
+
+
+class InfractionFactory:
+    """Factory that creates infractions for a User instance."""
+
+    infraction_id = count(1)
+    user_id = count(1)
+    default_values = {
+        'active': True,
+        'expires_at': None,
+        'hidden': False,
+    }
+
+    @classmethod
+    def create(
+        cls,
+        actor: User,
+        infractions: Iterable[Dict[str, Union[str, int, bool]]],
+        infraction_model: Type[Infraction] = Infraction,
+        user_model: Type[User] = User,
+    ) -> InfractionHistory:
+        """
+        Creates `infractions` for the `user` with the given `actor`.
+
+        The `infractions` dictionary can contain the following fields:
+         - `type` (required)
+         - `active` (default: True)
+         - `expires_at` (default: None; i.e, permanent)
+         - `hidden` (default: False).
+
+        The parameters `infraction_model` and `user_model` can be used to pass in an instance of
+        both model classes from a different migration/project state.
+        """
+        user_id = next(cls.user_id)
+        user = user_model.objects.create(
+            id=user_id,
+            name=f"Infracted user {user_id}",
+            discriminator=user_id,
+            avatar_hash=None,
+        )
+        infraction_history = []
+
+        for infraction in infractions:
+            infraction = dict(infraction)
+            infraction["id"] = next(cls.infraction_id)
+            infraction = ChainMap(infraction, cls.default_values)
+            new_infraction = infraction_model.objects.create(
+                user=user,
+                actor=actor,
+                type=infraction["type"],
+                reason=f"`{infraction['type']}` infraction (ID: {infraction['id']} of {user}",
+                active=infraction['active'],
+                hidden=infraction['hidden'],
+                expires_at=infraction['expires_at'],
+            )
+            infraction_history.append(new_infraction)
+
+        return InfractionHistory(user_id=user_id, infraction_history=infraction_history)
+
+
+class InfractionFactoryTests(MigrationsTestCase):
+    """Tests for the InfractionFactory."""
+
+    app = "api"
+    migration_prior = "0046_reminder_jump_url"
+    migration_target = "0046_reminder_jump_url"
+
+    @classmethod
+    def setUpPostMigrationData(cls, apps):
+        """Create a default actor for all infractions."""
+        cls.infraction_model = apps.get_model('api', 'Infraction')
+        cls.user_model = apps.get_model('api', 'User')
+
+        cls.actor = cls.user_model.objects.create(
+            id=9999,
+            name="Unknown Moderator",
+            discriminator=1040,
+            avatar_hash=None,
+        )
+
+    def test_infraction_factory_total_count(self):
+        """Does the test database hold as many infractions as we tried to create?"""
+        InfractionFactory.create(
+            actor=self.actor,
+            infractions=(
+                {'type': 'kick', 'active': False, 'hidden': False},
+                {'type': 'ban', 'active': True, 'hidden': False},
+                {'type': 'note', 'active': False, 'hidden': True},
+            ),
+            infraction_model=self.infraction_model,
+            user_model=self.user_model,
+        )
+        database_count = Infraction.objects.all().count()
+        self.assertEqual(3, database_count)
+
+    def test_infraction_factory_multiple_users(self):
+        """Does the test database hold as many infractions as we tried to create?"""
+        for _user in range(5):
+            InfractionFactory.create(
+                actor=self.actor,
+                infractions=(
+                    {'type': 'kick', 'active': False, 'hidden': True},
+                    {'type': 'ban', 'active': True, 'hidden': False},
+                ),
+                infraction_model=self.infraction_model,
+                user_model=self.user_model,
+            )
+
+        # Check if infractions and users are recorded properly in the database
+        database_count = Infraction.objects.all().count()
+        self.assertEqual(database_count, 10)
+
+        user_count = User.objects.all().count()
+        self.assertEqual(user_count, 5 + 1)
+
+    def test_infraction_factory_sets_correct_fields(self):
+        """Does the InfractionFactory set the correct attributes?"""
+        infractions = (
+            {
+                'type': 'note',
+                'active': False,
+                'hidden': True,
+                'expires_at': timezone.now()
+            },
+            {'type': 'warning', 'active': False, 'hidden': False, 'expires_at': None},
+            {'type': 'watch', 'active': False, 'hidden': True, 'expires_at': None},
+            {'type': 'mute', 'active': True, 'hidden': False, 'expires_at': None},
+            {'type': 'kick', 'active': True, 'hidden': True, 'expires_at': None},
+            {'type': 'ban', 'active': True, 'hidden': False, 'expires_at': None},
+            {
+                'type': 'superstar',
+                'active': True,
+                'hidden': True,
+                'expires_at': timezone.now()
+            },
+        )
+
+        InfractionFactory.create(
+            actor=self.actor,
+            infractions=infractions,
+            infraction_model=self.infraction_model,
+            user_model=self.user_model,
+        )
+
+        for infraction in infractions:
+            with self.subTest(**infraction):
+                self.assertTrue(Infraction.objects.filter(**infraction).exists())
+
+
+class ActiveInfractionMigrationTests(MigrationsTestCase):
+    """
+    Tests the active infraction data migration.
+
+    The active infraction data migration should do the following things:
+
+    1.  migrates all active notes, warnings, and kicks to an inactive status;
+    2.  migrates all users with multiple active infractions of a single type to have only one active
+        infraction of that type. The infraction with the longest duration stays active.
+    """
+
+    app = "api"
+    migration_prior = "0046_reminder_jump_url"
+    migration_target = "0047_active_infractions_migration"
+
+    @classmethod
+    def setUpMigrationData(cls, apps):
+        """Sets up an initial database state that contains the relevant test cases."""
+        # Fetch the Infraction and User model in the current migration state
+        cls.infraction_model = apps.get_model('api', 'Infraction')
+        cls.user_model = apps.get_model('api', 'User')
+
+        cls.created_infractions = {}
+
+        # Moderator that serves as actor for all infractions
+        cls.user_moderator = cls.user_model.objects.create(
+            id=9999,
+            name="Olivier de Vienne",
+            discriminator=1040,
+            avatar_hash=None,
+        )
+
+        # User #1: clean user with no infractions
+        cls.created_infractions["no infractions"] = InfractionFactory.create(
+            actor=cls.user_moderator,
+            infractions=[],
+            infraction_model=cls.infraction_model,
+            user_model=cls.user_model,
+        )
+
+        # User #2: One inactive note infraction
+        cls.created_infractions["one inactive note"] = InfractionFactory.create(
+            actor=cls.user_moderator,
+            infractions=(
+                {'type': 'note', 'active': False, 'hidden': True},
+            ),
+            infraction_model=cls.infraction_model,
+            user_model=cls.user_model,
+        )
+
+        # User #3: One active note infraction
+        cls.created_infractions["one active note"] = InfractionFactory.create(
+            actor=cls.user_moderator,
+            infractions=(
+                {'type': 'note', 'active': True, 'hidden': True},
+            ),
+            infraction_model=cls.infraction_model,
+            user_model=cls.user_model,
+        )
+
+        # User #4: One active and one inactive note infraction
+        cls.created_infractions["one active and one inactive note"] = InfractionFactory.create(
+            actor=cls.user_moderator,
+            infractions=(
+                {'type': 'note', 'active': False, 'hidden': True},
+                {'type': 'note', 'active': True, 'hidden': True},
+            ),
+            infraction_model=cls.infraction_model,
+            user_model=cls.user_model,
+        )
+
+        # User #5: Once active note, one active kick, once active warning
+        cls.created_infractions["active note, kick, warning"] = InfractionFactory.create(
+            actor=cls.user_moderator,
+            infractions=(
+                {'type': 'note', 'active': True, 'hidden': True},
+                {'type': 'kick', 'active': True, 'hidden': True},
+                {'type': 'warning', 'active': True, 'hidden': True},
+            ),
+            infraction_model=cls.infraction_model,
+            user_model=cls.user_model,
+        )
+
+        # User #6: One inactive ban and one active ban
+        cls.created_infractions["one inactive and one active ban"] = InfractionFactory.create(
+            actor=cls.user_moderator,
+            infractions=(
+                {'type': 'ban', 'active': False, 'hidden': True},
+                {'type': 'ban', 'active': True, 'hidden': True},
+            ),
+            infraction_model=cls.infraction_model,
+            user_model=cls.user_model,
+        )
+
+        # User #7: Two active permanent bans
+        cls.created_infractions["two active perm bans"] = InfractionFactory.create(
+            actor=cls.user_moderator,
+            infractions=(
+                {'type': 'ban', 'active': True, 'hidden': True},
+                {'type': 'ban', 'active': True, 'hidden': True},
+            ),
+            infraction_model=cls.infraction_model,
+            user_model=cls.user_model,
+        )
+
+        # User #8: Multiple active temporary bans
+        cls.created_infractions["multiple active temp bans"] = InfractionFactory.create(
+            actor=cls.user_moderator,
+            infractions=(
+                {
+                    'type': 'ban',
+                    'active': True,
+                    'hidden': True,
+                    'expires_at': timezone.now() + timedelta(days=1)
+                },
+                {
+                    'type': 'ban',
+                    'active': True,
+                    'hidden': True,
+                    'expires_at': timezone.now() + timedelta(days=10)
+                },
+                {
+                    'type': 'ban',
+                    'active': True,
+                    'hidden': True,
+                    'expires_at': timezone.now() + timedelta(days=20)
+                },
+                {
+                    'type': 'ban',
+                    'active': True,
+                    'hidden': True,
+                    'expires_at': timezone.now() + timedelta(days=5)
+                },
+            ),
+            infraction_model=cls.infraction_model,
+            user_model=cls.user_model,
+        )
+
+        # User #9: One active permanent ban, two active temporary bans
+        cls.created_infractions["active perm, two active temp bans"] = InfractionFactory.create(
+            actor=cls.user_moderator,
+            infractions=(
+                {
+                    'type': 'ban',
+                    'active': True,
+                    'hidden': True,
+                    'expires_at': timezone.now() + timedelta(days=10)
+                },
+                {
+                    'type': 'ban',
+                    'active': True,
+                    'hidden': True,
+                    'expires_at': None,
+                },
+                {
+                    'type': 'ban',
+                    'active': True,
+                    'hidden': True,
+                    'expires_at': timezone.now() + timedelta(days=7)
+                },
+            ),
+            infraction_model=cls.infraction_model,
+            user_model=cls.user_model,
+        )
+
+        # User #10: One inactive permanent ban, two active temporary bans
+        cls.created_infractions["one inactive perm ban, two active temp bans"] = (
+            InfractionFactory.create(
+                actor=cls.user_moderator,
+                infractions=(
+                    {
+                        'type': 'ban',
+                        'active': True,
+                        'hidden': True,
+                        'expires_at': timezone.now() + timedelta(days=10)
+                    },
+                    {
+                        'type': 'ban',
+                        'active': False,
+                        'hidden': True,
+                        'expires_at': None,
+                    },
+                    {
+                        'type': 'ban',
+                        'active': True,
+                        'hidden': True,
+                        'expires_at': timezone.now() + timedelta(days=7)
+                    },
+                ),
+                infraction_model=cls.infraction_model,
+                user_model=cls.user_model,
+            )
+        )
+
+        # User #11: Active ban, active mute, active superstar
+        cls.created_infractions["active ban, mute, and superstar"] = InfractionFactory.create(
+            actor=cls.user_moderator,
+            infractions=(
+                {'type': 'ban', 'active': True, 'hidden': True},
+                {'type': 'mute', 'active': True, 'hidden': True},
+                {'type': 'superstar', 'active': True, 'hidden': True},
+                {'type': 'watch', 'active': True, 'hidden': True},
+            ),
+            infraction_model=cls.infraction_model,
+            user_model=cls.user_model,
+        )
+
+        # User #12: Multiple active bans, active mutes, active superstars
+        cls.created_infractions["multiple active bans, mutes, stars"] = InfractionFactory.create(
+            actor=cls.user_moderator,
+            infractions=(
+                {'type': 'ban', 'active': True, 'hidden': True},
+                {'type': 'ban', 'active': True, 'hidden': True},
+                {'type': 'ban', 'active': True, 'hidden': True},
+                {'type': 'mute', 'active': True, 'hidden': True},
+                {'type': 'mute', 'active': True, 'hidden': True},
+                {'type': 'mute', 'active': True, 'hidden': True},
+                {'type': 'superstar', 'active': True, 'hidden': True},
+                {'type': 'superstar', 'active': True, 'hidden': True},
+                {'type': 'superstar', 'active': True, 'hidden': True},
+                {'type': 'watch', 'active': True, 'hidden': True},
+                {'type': 'watch', 'active': True, 'hidden': True},
+                {'type': 'watch', 'active': True, 'hidden': True},
+            ),
+            infraction_model=cls.infraction_model,
+            user_model=cls.user_model,
+        )
+
+    def test_all_never_active_types_became_inactive(self):
+        """Are all infractions of a non-active type inactive after the migration?"""
+        inactive_type_query = Q(type="note") | Q(type="warning") | Q(type="kick")
+        self.assertFalse(
+            self.infraction_model.objects.filter(inactive_type_query, active=True).exists()
+        )
+
+    def test_migration_left_clean_user_without_infractions(self):
+        """Do users without infractions have no infractions after the migration?"""
+        user_id, infraction_history = self.created_infractions["no infractions"]
+        self.assertFalse(
+            self.infraction_model.objects.filter(user__id=user_id).exists()
+        )
+
+    def test_migration_left_user_with_inactive_note_untouched(self):
+        """Did the migration leave users with only an inactive note untouched?"""
+        user_id, infraction_history = self.created_infractions["one inactive note"]
+        inactive_note = infraction_history[0]
+        self.assertTrue(
+            self.infraction_model.objects.filter(**model_to_dict(inactive_note)).exists()
+        )
+
+    def test_migration_only_touched_active_field_of_active_note(self):
+        """Does the migration only change the `active` field?"""
+        user_id, infraction_history = self.created_infractions["one active note"]
+        note = model_to_dict(infraction_history[0])
+        note['active'] = False
+        self.assertTrue(
+            self.infraction_model.objects.filter(**note).exists()
+        )
+
+    def test_migration_only_touched_active_field_of_active_note_left_inactive_untouched(self):
+        """Does the migration only change the `active` field of active notes?"""
+        user_id, infraction_history = self.created_infractions["one active and one inactive note"]
+        for note in infraction_history:
+            with self.subTest(active=note.active):
+                note = model_to_dict(note)
+                note['active'] = False
+                self.assertTrue(
+                    self.infraction_model.objects.filter(**note).exists()
+                )
+
+    def test_migration_migrates_all_nonactive_types_to_inactive(self):
+        """Do we set the `active` field of all non-active infractions to `False`?"""
+        user_id, infraction_history = self.created_infractions["active note, kick, warning"]
+        self.assertFalse(
+            self.infraction_model.objects.filter(user__id=user_id, active=True).exists()
+        )
+
+    def test_migration_leaves_user_with_one_active_ban_untouched(self):
+        """Do we leave a user with one active and one inactive ban untouched?"""
+        user_id, infraction_history = self.created_infractions["one inactive and one active ban"]
+        for infraction in infraction_history:
+            with self.subTest(active=infraction.active):
+                self.assertTrue(
+                    self.infraction_model.objects.filter(**model_to_dict(infraction)).exists()
+                )
+
+    def test_migration_turns_double_active_perm_ban_into_single_active_perm_ban(self):
+        """Does the migration turn two active permanent bans into one active permanent ban?"""
+        user_id, infraction_history = self.created_infractions["two active perm bans"]
+        active_count = self.infraction_model.objects.filter(user__id=user_id, active=True).count()
+        self.assertEqual(active_count, 1)
+
+    def test_migration_leaves_temporary_ban_with_longest_duration_active(self):
+        """Does the migration turn two active permanent bans into one active permanent ban?"""
+        user_id, infraction_history = self.created_infractions["multiple active temp bans"]
+        active_ban = self.infraction_model.objects.get(user__id=user_id, active=True)
+        self.assertEqual(active_ban.expires_at, infraction_history[2].expires_at)
+
+    def test_migration_leaves_permanent_ban_active(self):
+        """Does the migration leave the permanent ban active?"""
+        user_id, infraction_history = self.created_infractions["active perm, two active temp bans"]
+        active_ban = self.infraction_model.objects.get(user__id=user_id, active=True)
+        self.assertIsNone(active_ban.expires_at)
+
+    def test_migration_leaves_longest_temp_ban_active_with_inactive_permanent_ban(self):
+        """Does the longest temp ban stay active, even with an inactive perm ban present?"""
+        user_id, infraction_history = self.created_infractions[
+            "one inactive perm ban, two active temp bans"
+        ]
+        active_ban = self.infraction_model.objects.get(user__id=user_id, active=True)
+        self.assertEqual(active_ban.expires_at, infraction_history[0].expires_at)
+
+    def test_migration_leaves_all_active_types_active_if_one_of_each_exists(self):
+        """Do all active infractions stay active if only one of each is present?"""
+        user_id, infraction_history = self.created_infractions["active ban, mute, and superstar"]
+        active_count = self.infraction_model.objects.filter(user__id=user_id, active=True).count()
+        self.assertEqual(active_count, 4)
+
+    def test_migration_reduces_all_active_types_to_a_single_active_infraction(self):
+        """Do we reduce all of the infraction types to one active infraction?"""
+        user_id, infraction_history = self.created_infractions["multiple active bans, mutes, stars"]
+        active_infractions = self.infraction_model.objects.filter(user__id=user_id, active=True)
+        self.assertEqual(len(active_infractions), 4)
+        types_observed = [infraction.type for infraction in active_infractions]
+
+        for infraction_type in ('ban', 'mute', 'superstar', 'watch'):
+            with self.subTest(type=infraction_type):
+                self.assertIn(infraction_type, types_observed)
diff --git a/pydis_site/apps/api/tests/migrations/test_base.py b/pydis_site/apps/api/tests/migrations/test_base.py
new file mode 100644
index 00000000..f69bc92c
--- /dev/null
+++ b/pydis_site/apps/api/tests/migrations/test_base.py
@@ -0,0 +1,135 @@
+import logging
+from unittest.mock import call, patch
+
+from django.db.migrations.loader import MigrationLoader
+from django.test import TestCase
+
+from .base import MigrationsTestCase, connection
+
+log = logging.getLogger(__name__)
+
+
+class SpanishInquisition(MigrationsTestCase):
+    app = "api"
+    migration_prior = "scragly"
+    migration_target = "kosa"
+
+
+@patch("pydis_site.apps.api.tests.migrations.base.MigrationExecutor")
+class MigrationsTestCaseNoSideEffectsTests(TestCase):
+    """Tests the MigrationTestCase class with actual migration side effects disabled."""
+
+    def setUp(self):
+        """Set up an instance of MigrationsTestCase for use in tests."""
+        self.test_case = SpanishInquisition()
+
+    def test_missing_app_class_raises_value_error(self, _migration_executor):
+        """A MigrationsTestCase subclass should set the class-attribute `app`."""
+        class Spam(MigrationsTestCase):
+            pass
+
+        spam = Spam()
+        with self.assertRaises(ValueError, msg="The `app` attribute was not set."):
+            spam.setUpTestData()
+
+    def test_missing_migration_class_attributes_raise_value_error(self, _migration_executor):
+        """A MigrationsTestCase subclass should set both `migration_prior` and `migration_target`"""
+        class Eggs(MigrationsTestCase):
+            app = "api"
+            migration_target = "lemon"
+
+        class Bacon(MigrationsTestCase):
+            app = "api"
+            migration_prior = "mark"
+
+        instances = (Eggs(), Bacon())
+
+        exception_message = "Both ` migration_prior` and `migration_target` need to be set."
+        for instance in instances:
+            with self.subTest(
+                    migration_prior=instance.migration_prior,
+                    migration_target=instance.migration_target,
+            ):
+                with self.assertRaises(ValueError, msg=exception_message):
+                    instance.setUpTestData()
+
+    @patch(f"{__name__}.SpanishInquisition.setUpMigrationData")
+    @patch(f"{__name__}.SpanishInquisition.setUpPostMigrationData")
+    def test_migration_data_hooks_are_called_once(self, pre_hook, post_hook, _migration_executor):
+        """The `setUpMigrationData` and `setUpPostMigrationData` hooks should be called once."""
+        self.test_case.setUpTestData()
+        for hook in (pre_hook, post_hook):
+            with self.subTest(hook=repr(hook)):
+                hook.assert_called_once()
+
+    def test_migration_executor_is_instantiated_twice(self, migration_executor):
+        """The `MigrationExecutor` should be instantiated with the database connection twice."""
+        self.test_case.setUpTestData()
+
+        expected_args = [call(connection), call(connection)]
+        self.assertEqual(migration_executor.call_args_list, expected_args)
+
+    def test_project_state_is_loaded_for_correct_migration_files_twice(self, migration_executor):
+        """The `project_state` should first be loaded with `migrate_from`, then `migrate_to`."""
+        self.test_case.setUpTestData()
+
+        expected_args = [call(self.test_case.migrate_from), call(self.test_case.migrate_to)]
+        self.assertEqual(migration_executor().loader.project_state.call_args_list, expected_args)
+
+    def test_loader_build_graph_gets_called_once(self, migration_executor):
+        """We should rebuild the migration graph before applying the second set of migrations."""
+        self.test_case.setUpTestData()
+
+        migration_executor().loader.build_graph.assert_called_once()
+
+    def test_migration_executor_migrate_method_is_called_correctly_twice(self, migration_executor):
+        """The migrate method of the executor should be called twice with the correct arguments."""
+        self.test_case.setUpTestData()
+
+        self.assertEqual(migration_executor().migrate.call_count, 2)
+        calls = [call([('api', 'scragly')]), call([('api', 'kosa')])]
+        migration_executor().migrate.assert_has_calls(calls)
+
+
+class LifeOfBrian(MigrationsTestCase):
+    app = "api"
+    migration_prior = "0046_reminder_jump_url"
+    migration_target = "0048_add_infractions_unique_constraints_active"
+
+    @classmethod
+    def log_last_migration(cls):
+        """Parses the applied migrations dictionary to log the last applied migration."""
+        loader = MigrationLoader(connection)
+        api_migrations = [
+            migration for app, migration in loader.applied_migrations if app == cls.app
+        ]
+        last_migration = max(api_migrations, key=lambda name: int(name[:4]))
+        log.info(f"The last applied migration: {last_migration}")
+
+    @classmethod
+    def setUpMigrationData(cls, apps):
+        """Method that logs the last applied migration at this point."""
+        cls.log_last_migration()
+
+    @classmethod
+    def setUpPostMigrationData(cls, apps):
+        """Method that logs the last applied migration at this point."""
+        cls.log_last_migration()
+
+
+class MigrationsTestCaseMigrationTest(TestCase):
+    """Tests if `MigrationsTestCase` travels to the right points in the migration history."""
+
+    def test_migrations_test_case_travels_to_correct_migrations_in_history(self):
+        """The test case should first revert to `migration_prior`, then go to `migration_target`."""
+        brian = LifeOfBrian()
+
+        with self.assertLogs(log, level=logging.INFO) as logs:
+            brian.setUpTestData()
+
+            self.assertEqual(len(logs.records), 2)
+
+            for time_point, record in zip(("migration_prior", "migration_target"), logs.records):
+                with self.subTest(time_point=time_point):
+                    message = f"The last applied migration: {getattr(brian, time_point)}"
+                    self.assertEqual(record.getMessage(), message)
diff --git a/pydis_site/apps/api/tests/test_infractions.py b/pydis_site/apps/api/tests/test_infractions.py
index c58c32e2..7a54640e 100644
--- a/pydis_site/apps/api/tests/test_infractions.py
+++ b/pydis_site/apps/api/tests/test_infractions.py
@@ -1,6 +1,8 @@
 from datetime import datetime as dt, timedelta, timezone
+from unittest.mock import patch
 from urllib.parse import quote
 
+from django.db.utils import IntegrityError
 from django_hosts.resolvers import reverse
 
 from .base import APISubdomainTestCase
@@ -167,6 +169,12 @@ class CreationTests(APISubdomainTestCase):
             discriminator=1,
             avatar_hash=None
         )
+        cls.second_user = User.objects.create(
+            id=6,
+            name='carl',
+            discriminator=2,
+            avatar_hash=None
+        )
 
     def test_accepts_valid_data(self):
         url = reverse('bot:infraction-list', host='api')
@@ -305,6 +313,187 @@ class CreationTests(APISubdomainTestCase):
             'hidden': [f'{data["type"]} infractions must be hidden.']
         })
 
+    def test_returns_400_for_active_infraction_of_type_that_cannot_be_active(self):
+        """Test if the API rejects active infractions for types that cannot be active."""
+        url = reverse('bot:infraction-list', host='api')
+        restricted_types = (
+            ('note', True),
+            ('warning', False),
+            ('kick', False),
+        )
+
+        for infraction_type, hidden in restricted_types:
+            with self.subTest(infraction_type=infraction_type):
+                invalid_infraction = {
+                    'user': self.user.id,
+                    'actor': self.user.id,
+                    'type': infraction_type,
+                    'reason': 'Take me on!',
+                    'hidden': hidden,
+                    'active': True,
+                    'expires_at': None,
+                }
+                response = self.client.post(url, data=invalid_infraction)
+                self.assertEqual(response.status_code, 400)
+                self.assertEqual(
+                    response.json(),
+                    {'active': [f'{infraction_type} infractions cannot be active.']}
+                )
+
+    def test_returns_400_for_second_active_infraction_of_the_same_type(self):
+        """Test if the API rejects a second active infraction of the same type for a given user."""
+        url = reverse('bot:infraction-list', host='api')
+        active_infraction_types = ('mute', 'ban', 'superstar')
+
+        for infraction_type in active_infraction_types:
+            with self.subTest(infraction_type=infraction_type):
+                first_active_infraction = {
+                    'user': self.user.id,
+                    'actor': self.user.id,
+                    'type': infraction_type,
+                    'reason': 'Take me on!',
+                    'active': True,
+                    'expires_at': '2019-10-04T12:52:00+00:00'
+                }
+
+                # Post the first active infraction of a type and confirm it's accepted.
+                first_response = self.client.post(url, data=first_active_infraction)
+                self.assertEqual(first_response.status_code, 201)
+
+                second_active_infraction = {
+                    'user': self.user.id,
+                    'actor': self.user.id,
+                    'type': infraction_type,
+                    'reason': 'Take on me!',
+                    'active': True,
+                    'expires_at': '2019-10-04T12:52:00+00:00'
+                }
+                second_response = self.client.post(url, data=second_active_infraction)
+                self.assertEqual(second_response.status_code, 400)
+                self.assertEqual(
+                    second_response.json(),
+                    {
+                        'non_field_errors': [
+                            'This user already has an active infraction of this type.'
+                        ]
+                    }
+                )
+
+    def test_returns_201_for_second_active_infraction_of_different_type(self):
+        """Test if the API accepts a second active infraction of a different type than the first."""
+        url = reverse('bot:infraction-list', host='api')
+        first_active_infraction = {
+            'user': self.user.id,
+            'actor': self.user.id,
+            'type': 'mute',
+            'reason': 'Be silent!',
+            'hidden': True,
+            'active': True,
+            'expires_at': '2019-10-04T12:52:00+00:00'
+        }
+        second_active_infraction = {
+            'user': self.user.id,
+            'actor': self.user.id,
+            'type': 'ban',
+            'reason': 'Be gone!',
+            'hidden': True,
+            'active': True,
+            'expires_at': '2019-10-05T12:52:00+00:00'
+        }
+        # Post the first active infraction of a type and confirm it's accepted.
+        first_response = self.client.post(url, data=first_active_infraction)
+        self.assertEqual(first_response.status_code, 201)
+
+        # Post the first active infraction of a type and confirm it's accepted.
+        second_response = self.client.post(url, data=second_active_infraction)
+        self.assertEqual(second_response.status_code, 201)
+
+    def test_unique_constraint_raises_integrity_error_on_second_active_of_same_type(self):
+        """Do we raise `IntegrityError` for the second active infraction of a type for a user?"""
+        Infraction.objects.create(
+            user=self.user,
+            actor=self.user,
+            type="ban",
+            active=True,
+            reason="The first active ban"
+        )
+        with self.assertRaises(IntegrityError):
+            Infraction.objects.create(
+                user=self.user,
+                actor=self.user,
+                type="ban",
+                active=True,
+                reason="The second active ban"
+            )
+
+    def test_unique_constraint_accepts_active_infraction_after_inactive_infraction(self):
+        """Do we accept an active infraction if the others of the same type are inactive?"""
+        try:
+            Infraction.objects.create(
+                user=self.user,
+                actor=self.user,
+                type="ban",
+                active=False,
+                reason="The first inactive ban"
+            )
+            Infraction.objects.create(
+                user=self.user,
+                actor=self.user,
+                type="ban",
+                active=False,
+                reason="The second inactive ban"
+            )
+            Infraction.objects.create(
+                user=self.user,
+                actor=self.user,
+                type="ban",
+                active=True,
+                reason="The first active ban"
+            )
+        except IntegrityError:
+            self.fail("An unexpected IntegrityError was raised.")
+
+    @patch(f"{__name__}.Infraction")
+    def test_if_accepts_active_infraction_test_catches_integrity_error(self, infraction_patch):
+        """Does the test properly catch the IntegrityError and raise an AssertionError?"""
+        infraction_patch.objects.create.side_effect = IntegrityError
+        with self.assertRaises(AssertionError, msg="An unexpected IntegrityError was raised."):
+            self.test_unique_constraint_accepts_active_infraction_after_inactive_infraction()
+
+    def test_unique_constraint_accepts_second_active_of_different_type(self):
+        """Do we accept a second active infraction of a different type for a given user?"""
+        Infraction.objects.create(
+            user=self.user,
+            actor=self.user,
+            type="ban",
+            active=True,
+            reason="The first active ban"
+        )
+        Infraction.objects.create(
+            user=self.user,
+            actor=self.user,
+            type="mute",
+            active=True,
+            reason="The first active mute"
+        )
+
+    def test_unique_constraint_accepts_active_infractions_for_different_users(self):
+        """Do we accept two active infractions of the same type for two different users?"""
+        Infraction.objects.create(
+            user=self.user,
+            actor=self.user,
+            type="ban",
+            active=True,
+            reason="An active ban for the first user"
+        )
+        Infraction.objects.create(
+            user=self.second_user,
+            actor=self.second_user,
+            type="ban",
+            active=False,
+            reason="An active ban for the second user"
+        )
+
 
 class ExpandedTests(APISubdomainTestCase):
     @classmethod
@@ -318,12 +507,14 @@ class ExpandedTests(APISubdomainTestCase):
         cls.kick = Infraction.objects.create(
             user_id=cls.user.id,
             actor_id=cls.user.id,
-            type='kick'
+            type='kick',
+            active=False
         )
         cls.warning = Infraction.objects.create(
             user_id=cls.user.id,
             actor_id=cls.user.id,
-            type='warning'
+            type='warning',
+            active=False,
         )
 
     def check_expanded_fields(self, infraction):
diff --git a/pydis_site/apps/home/forms/__init__.py b/pydis_site/apps/home/forms/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/pydis_site/apps/home/forms/__init__.py
diff --git a/pydis_site/apps/home/forms/account_deletion.py b/pydis_site/apps/home/forms/account_deletion.py
new file mode 100644
index 00000000..17ffe5c1
--- /dev/null
+++ b/pydis_site/apps/home/forms/account_deletion.py
@@ -0,0 +1,24 @@
+from crispy_forms.helper import FormHelper
+from crispy_forms.layout import Layout
+from django.forms import CharField, Form
+from django_crispy_bulma.layout import IconField, Submit
+
+
+class AccountDeletionForm(Form):
+    """Account deletion form, to collect username for confirmation of removal."""
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.helper = FormHelper()
+
+        self.helper.form_method = "post"
+        self.helper.add_input(Submit("submit", "I understand, delete my account"))
+
+        self.helper.layout = Layout(
+            IconField("username", icon_prepend="user")
+        )
+
+    username = CharField(
+        label="Username",
+        required=True
+    )
diff --git a/pydis_site/apps/home/signals.py b/pydis_site/apps/home/signals.py
index 9f286882..4cb4564b 100644
--- a/pydis_site/apps/home/signals.py
+++ b/pydis_site/apps/home/signals.py
@@ -1,3 +1,4 @@
+from contextlib import suppress
 from typing import List, Optional, Type
 
 from allauth.account.signals import user_logged_in
@@ -8,7 +9,7 @@ from allauth.socialaccount.signals import (
     pre_social_login, social_account_added, social_account_removed,
     social_account_updated)
 from django.contrib.auth.models import Group, User as DjangoUser
-from django.db.models.signals import post_save, pre_delete, pre_save
+from django.db.models.signals import post_delete, post_save, pre_save
 
 from pydis_site.apps.api.models import User as DiscordUser
 from pydis_site.apps.staff.models import RoleMapping
@@ -37,7 +38,7 @@ class AllauthSignalListener:
     def __init__(self):
         post_save.connect(self.user_model_updated, sender=DiscordUser)
 
-        pre_delete.connect(self.mapping_model_deleted, sender=RoleMapping)
+        post_delete.connect(self.mapping_model_deleted, sender=RoleMapping)
         pre_save.connect(self.mapping_model_updated, sender=RoleMapping)
 
         pre_social_login.connect(self.social_account_updated)
@@ -133,13 +134,29 @@ class AllauthSignalListener:
         Processes deletion signals from the RoleMapping model, removing perms from users.
 
         We need to do this to ensure that users aren't left with permissions groups that
-        they shouldn't have assigned to them when a RoleMapping is deleted from the database.
+        they shouldn't have assigned to them when a RoleMapping is deleted from the database,
+        and to remove their staff status if they should no longer have it.
         """
         instance: RoleMapping = kwargs["instance"]
 
         for user in instance.group.user_set.all():
+            # Firstly, remove their related user group
             user.groups.remove(instance.group)
 
+            with suppress(SocialAccount.DoesNotExist, DiscordUser.DoesNotExist):
+                # If we get either exception, then the user could not have been assigned staff
+                # with our system in the first place.
+
+                social_account = SocialAccount.objects.get(user=user, provider=DiscordProvider.id)
+                discord_user = DiscordUser.objects.get(id=int(social_account.uid))
+
+                mappings = RoleMapping.objects.filter(role__in=discord_user.roles.all()).all()
+                is_staff = any(m.is_staff for m in mappings)
+
+                if user.is_staff != is_staff:
+                    user.is_staff = is_staff
+                    user.save(update_fields=("is_staff", ))
+
     def mapping_model_updated(self, sender: Type[RoleMapping], **kwargs) -> None:
         """
         Processes update signals from the RoleMapping model.
@@ -174,6 +191,21 @@ class AllauthSignalListener:
         for account in accounts:
             account.user.groups.add(instance.group)
 
+            if instance.is_staff and not account.user.is_staff:
+                account.user.is_staff = instance.is_staff
+                account.user.save(update_fields=("is_staff", ))
+            else:
+                discord_user = DiscordUser.objects.get(id=int(account.uid))
+
+                mappings = RoleMapping.objects.filter(
+                    role__in=discord_user.roles.all()
+                ).exclude(id=instance.id).all()
+                is_staff = any(m.is_staff for m in mappings)
+
+                if account.user.is_staff != is_staff:
+                    account.user.is_staff = is_staff
+                    account.user.save(update_fields=("is_staff",))
+
     def user_model_updated(self, sender: Type[DiscordUser], **kwargs) -> None:
         """
         Processes update signals from the Discord User model, assigning perms as required.
@@ -230,31 +262,53 @@ class AllauthSignalListener:
         except SocialAccount.user.RelatedObjectDoesNotExist:
             return  # There's no user account yet, this will be handled by another receiver
 
+        # Ensure that the username on this account is correct
+        new_username = f"{user.name}#{user.discriminator}"
+
+        if account.user.username != new_username:
+            account.user.username = new_username
+            account.user.first_name = new_username
+
         if not user.in_guild:
             deletion = True
 
         if deletion:
             # They've unlinked Discord or left the server, so we have to remove their groups
+            # and their staff status
 
-            if not current_groups:
-                return  # They have no groups anyway, no point in processing
+            if current_groups:
+                # They do have groups, so let's remove them
+                account.user.groups.remove(
+                    *(mapping.group for mapping in mappings)
+                )
 
-            account.user.groups.remove(
-                *(mapping.group for mapping in mappings)
-            )
+            if account.user.is_staff:
+                # They're marked as a staff user and they shouldn't be, so let's fix that
+                account.user.is_staff = False
         else:
             new_groups = []
+            is_staff = False
 
             for role in user.roles.all():
                 try:
-                    new_groups.append(mappings.get(role=role).group)
+                    mapping = mappings.get(role=role)
                 except RoleMapping.DoesNotExist:
                     continue  # No mapping exists
 
-                account.user.groups.add(
-                    *[group for group in new_groups if group not in current_groups]
-                )
+                new_groups.append(mapping.group)
 
-                account.user.groups.remove(
-                    *[mapping.group for mapping in mappings if mapping.group not in new_groups]
-                )
+                if mapping.is_staff:
+                    is_staff = True
+
+            account.user.groups.add(
+                *[group for group in new_groups if group not in current_groups]
+            )
+
+            account.user.groups.remove(
+                *[mapping.group for mapping in mappings if mapping.group not in new_groups]
+            )
+
+            if account.user.is_staff != is_staff:
+                account.user.is_staff = is_staff
+
+        account.user.save()
diff --git a/pydis_site/apps/home/tests/test_signal_listener.py b/pydis_site/apps/home/tests/test_signal_listener.py
index 27fc7710..66a67252 100644
--- a/pydis_site/apps/home/tests/test_signal_listener.py
+++ b/pydis_site/apps/home/tests/test_signal_listener.py
@@ -67,12 +67,14 @@ class SignalListenerTests(TestCase):
 
         cls.admin_mapping = RoleMapping.objects.create(
             role=cls.admin_role,
-            group=cls.admin_group
+            group=cls.admin_group,
+            is_staff=True
         )
 
         cls.moderator_mapping = RoleMapping.objects.create(
             role=cls.moderator_role,
-            group=cls.moderator_group
+            group=cls.moderator_group,
+            is_staff=False
         )
 
         cls.discord_user = DiscordUser.objects.create(
@@ -166,7 +168,7 @@ class SignalListenerTests(TestCase):
 
         cls.django_moderator = DjangoUser.objects.create(
             username="moderator",
-            is_staff=True,
+            is_staff=False,
             is_superuser=False
         )
 
@@ -339,6 +341,33 @@ class SignalListenerTests(TestCase):
         self.discord_admin.roles.add(self.admin_role)
         self.discord_admin.save()
 
+    def test_apply_groups_moderator(self):
+        """Test application of groups by role, relating to a non-`is_staff` moderator user."""
+        handler = AllauthSignalListener()
+
+        self.assertEqual(self.django_user_discordless.groups.all().count(), 0)
+
+        # Apply groups based on moderator role being present on Discord
+        handler._apply_groups(self.discord_moderator, self.social_moderator)
+        self.assertTrue(self.moderator_group in self.django_moderator.groups.all())
+
+        # Remove groups based on the user apparently leaving the server
+        handler._apply_groups(self.discord_moderator, self.social_moderator, True)
+        self.assertEqual(self.django_user_discordless.groups.all().count(), 0)
+
+        # Apply the moderator role again
+        handler._apply_groups(self.discord_moderator, self.social_moderator)
+
+        # Remove all of the roles from the user
+        self.discord_moderator.roles.clear()
+
+        # Remove groups based on the user no longer having the moderator role on Discord
+        handler._apply_groups(self.discord_moderator, self.social_moderator)
+        self.assertEqual(self.django_user_discordless.groups.all().count(), 0)
+
+        self.discord_moderator.roles.add(self.moderator_role)
+        self.discord_moderator.save()
+
     def test_apply_groups_other(self):
         """Test application of groups by role, relating to non-standard cases."""
         handler = AllauthSignalListener()
@@ -373,10 +402,25 @@ class SignalListenerTests(TestCase):
         self.assertEqual(self.django_moderator.groups.all().count(), 1)
         self.assertEqual(self.django_admin.groups.all().count(), 1)
 
+        # Test is_staff changes
+        self.admin_mapping.is_staff = False
+        self.admin_mapping.save()
+
+        self.assertFalse(self.django_moderator.is_staff)
+        self.assertFalse(self.django_admin.is_staff)
+
+        self.admin_mapping.is_staff = True
+        self.admin_mapping.save()
+
+        self.django_admin.refresh_from_db(fields=("is_staff", ))
+        self.assertTrue(self.django_admin.is_staff)
+
         # Test mapping deletion
         self.admin_mapping.delete()
 
+        self.django_admin.refresh_from_db(fields=("is_staff",))
         self.assertEqual(self.django_admin.groups.all().count(), 0)
+        self.assertFalse(self.django_admin.is_staff)
 
         # Test mapping update
         self.moderator_mapping.group = self.admin_group
@@ -388,12 +432,30 @@ class SignalListenerTests(TestCase):
         # Test mapping creation
         new_mapping = RoleMapping.objects.create(
             role=self.admin_role,
-            group=self.moderator_group
+            group=self.moderator_group,
+            is_staff=True
+        )
+
+        self.assertEqual(self.django_admin.groups.all().count(), 1)
+        self.assertTrue(self.moderator_group in self.django_admin.groups.all())
+
+        self.django_admin.refresh_from_db(fields=("is_staff",))
+        self.assertTrue(self.django_admin.is_staff)
+
+        new_mapping.delete()
+
+        # Test mapping creation (without is_staff)
+        new_mapping = RoleMapping.objects.create(
+            role=self.admin_role,
+            group=self.moderator_group,
         )
 
         self.assertEqual(self.django_admin.groups.all().count(), 1)
         self.assertTrue(self.moderator_group in self.django_admin.groups.all())
 
+        self.django_admin.refresh_from_db(fields=("is_staff",))
+        self.assertFalse(self.django_admin.is_staff)
+
         # Test that nothing happens when fixtures are loaded
         pre_save.send(RoleMapping, instance=new_mapping, raw=True)
 
diff --git a/pydis_site/apps/home/tests/test_views.py b/pydis_site/apps/home/tests/test_views.py
index 7aeaddd2..572317a7 100644
--- a/pydis_site/apps/home/tests/test_views.py
+++ b/pydis_site/apps/home/tests/test_views.py
@@ -1,5 +1,198 @@
+from allauth.socialaccount.models import SocialAccount
+from django.contrib.auth.models import User
+from django.http import HttpResponseRedirect
 from django.test import TestCase
-from django_hosts.resolvers import reverse
+from django_hosts.resolvers import get_host, reverse, reverse_host
+
+
+def check_redirect_url(
+        response: HttpResponseRedirect, reversed_url: str, strip_params=True
+) -> bool:
+    """
+    Check whether a given redirect response matches a specific reversed URL.
+
+    Arguments:
+    * `response`: The HttpResponseRedirect returned by the test client
+    * `reversed_url`: The URL returned by `reverse()`
+    * `strip_params`: Whether to strip URL parameters (following a "?") from the URL given in the
+                     `response` object
+    """
+    host = get_host(None)
+    hostname = reverse_host(host)
+
+    redirect_url = response.url
+
+    if strip_params and "?" in redirect_url:
+        redirect_url = redirect_url.split("?", 1)[0]
+
+    result = reversed_url == f"//{hostname}{redirect_url}"
+    return result
+
+
+class TestAccountDeleteView(TestCase):
+    def setUp(self) -> None:
+        """Create an authorized Django user for testing purposes."""
+        self.user = User.objects.create(
+            username="user#0000"
+        )
+
+    def test_redirect_when_logged_out(self):
+        """Test that the user is redirected to the homepage when not logged in."""
+        url = reverse("account_delete")
+        resp = self.client.get(url)
+        self.assertEqual(resp.status_code, 302)
+        self.assertTrue(check_redirect_url(resp, reverse("home")))
+
+    def test_get_when_logged_in(self):
+        """Test that the view returns a HTTP 200 when the user is logged in."""
+        url = reverse("account_delete")
+
+        self.client.force_login(self.user)
+        resp = self.client.get(url)
+        self.client.logout()
+
+        self.assertEqual(resp.status_code, 200)
+
+    def test_post_invalid(self):
+        """Test that the user is redirected when the form is filled out incorrectly."""
+        url = reverse("account_delete")
+
+        self.client.force_login(self.user)
+
+        resp = self.client.post(url, {})
+        self.assertEqual(resp.status_code, 302)
+        self.assertTrue(check_redirect_url(resp, url))
+
+        resp = self.client.post(url, {"username": "user"})
+        self.assertEqual(resp.status_code, 302)
+        self.assertTrue(check_redirect_url(resp, url))
+
+        self.client.logout()
+
+    def test_post_valid(self):
+        """Test that the account is deleted when the form is filled out correctly.."""
+        url = reverse("account_delete")
+
+        self.client.force_login(self.user)
+
+        resp = self.client.post(url, {"username": "user#0000"})
+        self.assertEqual(resp.status_code, 302)
+        self.assertTrue(check_redirect_url(resp, reverse("home")))
+
+        with self.assertRaises(User.DoesNotExist):
+            User.objects.get(username=self.user.username)
+
+        self.client.logout()
+
+
+class TestAccountSettingsView(TestCase):
+    def setUp(self) -> None:
+        """Create an authorized Django user for testing purposes."""
+        self.user = User.objects.create(
+            username="user#0000"
+        )
+
+        self.user_unlinked = User.objects.create(
+            username="user#9999"
+        )
+
+        self.user_unlinked_discord = User.objects.create(
+            username="user#1234"
+        )
+
+        self.user_unlinked_github = User.objects.create(
+            username="user#1111"
+        )
+
+        self.github_account = SocialAccount.objects.create(
+            user=self.user,
+            provider="github",
+            uid="0"
+        )
+
+        self.discord_account = SocialAccount.objects.create(
+            user=self.user,
+            provider="discord",
+            uid="0000"
+        )
+
+        self.github_account_secondary = SocialAccount.objects.create(
+            user=self.user_unlinked_discord,
+            provider="github",
+            uid="1"
+        )
+
+        self.discord_account_secondary = SocialAccount.objects.create(
+            user=self.user_unlinked_github,
+            provider="discord",
+            uid="1111"
+        )
+
+    def test_redirect_when_logged_out(self):
+        """Check that the user is redirected to the homepage when not logged in."""
+        url = reverse("account_settings")
+        resp = self.client.get(url)
+        self.assertEqual(resp.status_code, 302)
+        self.assertTrue(check_redirect_url(resp, reverse("home")))
+
+    def test_get_when_logged_in(self):
+        """Test that the view returns a HTTP 200 when the user is logged in."""
+        url = reverse("account_settings")
+
+        self.client.force_login(self.user)
+        resp = self.client.get(url)
+        self.client.logout()
+
+        self.assertEqual(resp.status_code, 200)
+
+        self.client.force_login(self.user_unlinked)
+        resp = self.client.get(url)
+        self.client.logout()
+
+        self.assertEqual(resp.status_code, 200)
+
+        self.client.force_login(self.user_unlinked_discord)
+        resp = self.client.get(url)
+        self.client.logout()
+
+        self.assertEqual(resp.status_code, 200)
+
+        self.client.force_login(self.user_unlinked_github)
+        resp = self.client.get(url)
+        self.client.logout()
+
+        self.assertEqual(resp.status_code, 200)
+
+    def test_post_invalid(self):
+        """Test the behaviour of invalid POST submissions."""
+        url = reverse("account_settings")
+
+        self.client.force_login(self.user_unlinked)
+
+        resp = self.client.post(url, {"provider": "discord"})
+        self.assertEqual(resp.status_code, 302)
+        self.assertTrue(check_redirect_url(resp, reverse("home")))
+
+        resp = self.client.post(url, {"provider": "github"})
+        self.assertEqual(resp.status_code, 302)
+        self.assertTrue(check_redirect_url(resp, reverse("home")))
+
+        self.client.logout()
+
+    def test_post_valid(self):
+        """Ensure that GitHub is unlinked with a valid POST submission."""
+        url = reverse("account_settings")
+
+        self.client.force_login(self.user)
+
+        resp = self.client.post(url, {"provider": "github"})
+        self.assertEqual(resp.status_code, 302)
+        self.assertTrue(check_redirect_url(resp, reverse("home")))
+
+        with self.assertRaises(SocialAccount.DoesNotExist):
+            SocialAccount.objects.get(user=self.user, provider="github")
+
+        self.client.logout()
 
 
 class TestIndexReturns200(TestCase):
@@ -16,6 +209,7 @@ class TestLoginCancelledReturns302(TestCase):
         url = reverse('socialaccount_login_cancelled')
         resp = self.client.get(url)
         self.assertEqual(resp.status_code, 302)
+        self.assertTrue(check_redirect_url(resp, reverse("home")))
 
 
 class TestLoginErrorReturns302(TestCase):
@@ -24,3 +218,4 @@ class TestLoginErrorReturns302(TestCase):
         url = reverse('socialaccount_login_error')
         resp = self.client.get(url)
         self.assertEqual(resp.status_code, 302)
+        self.assertTrue(check_redirect_url(resp, reverse("home")))
diff --git a/pydis_site/apps/home/urls.py b/pydis_site/apps/home/urls.py
index 211a7ad1..61e87a39 100644
--- a/pydis_site/apps/home/urls.py
+++ b/pydis_site/apps/home/urls.py
@@ -1,5 +1,4 @@
 from allauth.account.views import LogoutView
-from allauth.socialaccount.views import ConnectionsView
 from django.conf import settings
 from django.conf.urls.static import static
 from django.contrib import admin
@@ -7,14 +6,18 @@ from django.contrib.messages import ERROR
 from django.urls import include, path
 
 from pydis_site.utils.views import MessageRedirectView
-from .views import HomeView
+from .views import AccountDeleteView, AccountSettingsView, HomeView
 
 app_name = 'home'
 urlpatterns = [
+    # We do this twice because Allauth expects specific view names to exist
     path('', HomeView.as_view(), name='home'),
+    path('', HomeView.as_view(), name='socialaccount_connections'),
+
     path('pages/', include('wiki.urls')),
 
     path('accounts/', include('allauth.socialaccount.providers.discord.urls')),
+    path('accounts/', include('allauth.socialaccount.providers.github.urls')),
 
     path(
         'accounts/login/cancelled', MessageRedirectView.as_view(
@@ -28,7 +31,9 @@ urlpatterns = [
         ), name='socialaccount_login_error'
     ),
 
-    path('connections', ConnectionsView.as_view()),
+    path('accounts/settings', AccountSettingsView.as_view(), name="account_settings"),
+    path('accounts/delete', AccountDeleteView.as_view(), name="account_delete"),
+
     path('logout', LogoutView.as_view(), name="logout"),
 
     path('admin/', admin.site.urls),
diff --git a/pydis_site/apps/home/views/__init__.py b/pydis_site/apps/home/views/__init__.py
index 971d73a3..801fd398 100644
--- a/pydis_site/apps/home/views/__init__.py
+++ b/pydis_site/apps/home/views/__init__.py
@@ -1,3 +1,4 @@
+from .account import DeleteView as AccountDeleteView, SettingsView as AccountSettingsView
 from .home import HomeView
 
-__all__ = ["HomeView"]
+__all__ = ["AccountDeleteView", "AccountSettingsView", "HomeView"]
diff --git a/pydis_site/apps/home/views/account/__init__.py b/pydis_site/apps/home/views/account/__init__.py
new file mode 100644
index 00000000..3b3250ea
--- /dev/null
+++ b/pydis_site/apps/home/views/account/__init__.py
@@ -0,0 +1,4 @@
+from .delete import DeleteView
+from .settings import SettingsView
+
+__all__ = ["DeleteView", "SettingsView"]
diff --git a/pydis_site/apps/home/views/account/delete.py b/pydis_site/apps/home/views/account/delete.py
new file mode 100644
index 00000000..798b8a33
--- /dev/null
+++ b/pydis_site/apps/home/views/account/delete.py
@@ -0,0 +1,37 @@
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.contrib.messages import ERROR, INFO, add_message
+from django.http import HttpRequest, HttpResponse
+from django.shortcuts import redirect, render
+from django.urls import reverse
+from django.views import View
+
+from pydis_site.apps.home.forms.account_deletion import AccountDeletionForm
+
+
+class DeleteView(LoginRequiredMixin, View):
+    """Account deletion view, for removing linked user accounts from the DB."""
+
+    def __init__(self, *args, **kwargs):
+        self.login_url = reverse("home")
+        super().__init__(*args, **kwargs)
+
+    def get(self, request: HttpRequest) -> HttpResponse:
+        """HTTP GET: Return the view template."""
+        return render(
+            request, "home/account/delete.html",
+            context={"form": AccountDeletionForm()}
+        )
+
+    def post(self, request: HttpRequest) -> HttpResponse:
+        """HTTP POST: Process the deletion, as requested by the user."""
+        form = AccountDeletionForm(request.POST)
+
+        if not form.is_valid() or request.user.username != form.cleaned_data["username"]:
+            add_message(request, ERROR, "Please enter your username exactly as shown.")
+
+            return redirect(reverse("account_delete"))
+
+        request.user.delete()
+        add_message(request, INFO, "Your account has been deleted.")
+
+        return redirect(reverse("home"))
diff --git a/pydis_site/apps/home/views/account/settings.py b/pydis_site/apps/home/views/account/settings.py
new file mode 100644
index 00000000..3a817dbc
--- /dev/null
+++ b/pydis_site/apps/home/views/account/settings.py
@@ -0,0 +1,59 @@
+from allauth.socialaccount.models import SocialAccount
+from allauth.socialaccount.providers import registry
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.contrib.messages import ERROR, INFO, add_message
+from django.http import HttpRequest, HttpResponse
+from django.shortcuts import redirect, render
+from django.urls import reverse
+from django.views import View
+
+
+class SettingsView(LoginRequiredMixin, View):
+    """
+    Account settings view, for managing and deleting user accounts and connections.
+
+    This view actually renders a template with a bare modal, and is intended to be
+    inserted into another template using JavaScript.
+    """
+
+    def __init__(self, *args, **kwargs):
+        self.login_url = reverse("home")
+        super().__init__(*args, **kwargs)
+
+    def get(self, request: HttpRequest) -> HttpResponse:
+        """HTTP GET: Return the view template."""
+        context = {
+            "groups": request.user.groups.all(),
+
+            "discord": None,
+            "github": None,
+
+            "discord_provider": registry.provider_map.get("discord"),
+            "github_provider": registry.provider_map.get("github"),
+        }
+
+        for account in SocialAccount.objects.filter(user=request.user).all():
+            if account.provider == "discord":
+                context["discord"] = account
+
+            if account.provider == "github":
+                context["github"] = account
+
+        return render(request, "home/account/settings.html", context=context)
+
+    def post(self, request: HttpRequest) -> HttpResponse:
+        """HTTP POST: Process account disconnections."""
+        provider = request.POST["provider"]
+
+        if provider == "github":
+            try:
+                account = SocialAccount.objects.get(user=request.user, provider=provider)
+            except SocialAccount.DoesNotExist:
+                add_message(request, ERROR, "You do not have a GitHub account linked.")
+            else:
+                account.delete()
+                add_message(request, INFO, "The social account has been disconnected.")
+        else:
+            add_message(request, ERROR, f"Unknown provider: {provider}")
+
+        return redirect(reverse("home"))
diff --git a/pydis_site/apps/staff/migrations/0002_add_is_staff_to_role_mappings.py b/pydis_site/apps/staff/migrations/0002_add_is_staff_to_role_mappings.py
new file mode 100644
index 00000000..0404d270
--- /dev/null
+++ b/pydis_site/apps/staff/migrations/0002_add_is_staff_to_role_mappings.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.2.6 on 2019-10-20 14:19
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('staff', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='rolemapping',
+            name='is_staff',
+            field=models.BooleanField(default=False, help_text='Whether this role mapping relates to a Django staff group'),
+        ),
+    ]
diff --git a/pydis_site/apps/staff/models/role_mapping.py b/pydis_site/apps/staff/models/role_mapping.py
index 10c09cf1..8a1fac2e 100644
--- a/pydis_site/apps/staff/models/role_mapping.py
+++ b/pydis_site/apps/staff/models/role_mapping.py
@@ -21,6 +21,11 @@ class RoleMapping(models.Model):
         unique=True,  # Unique in order to simplify group assignment logic
     )
 
+    is_staff = models.BooleanField(
+        help_text="Whether this role mapping relates to a Django staff group",
+        default=False
+    )
+
     def __str__(self):
         """Returns the mapping, for display purposes."""
         return f"@{self.role.name} -> {self.group.name}"
diff --git a/pydis_site/settings.py b/pydis_site/settings.py
index 94718ec7..66376c4e 100644
--- a/pydis_site/settings.py
+++ b/pydis_site/settings.py
@@ -92,6 +92,7 @@ INSTALLED_APPS = [
     'allauth.socialaccount',
 
     'allauth.socialaccount.providers.discord',
+    'allauth.socialaccount.providers.github',
 
     'crispy_forms',
     'django_crispy_bulma',
@@ -302,14 +303,14 @@ BULMA_SETTINGS = {
     "variables": {  # If you update these colours, please update the notification.css file
         "primary": "#7289DA",    # Discord blurple
 
-        "orange": "#ffb39b",     # Bulma default, but at a saturation of 100
-        "yellow": "#ffea9b",     # Bulma default, but at a saturation of 100
-        "green": "#7fd19c",      # Bulma default, but at a saturation of 100
-        "turquoise": "#7289DA",  # Blurple, because Bulma uses this as the default primary
-        "cyan": "#91cbee",       # Bulma default, but at a saturation of 100
-        "blue": "#86a7dc",       # Bulma default, but at a saturation of 100
-        "purple": "#b86bff",     # Bulma default, but at a saturation of 100
-        "red": "#ffafc2",        # Bulma default, but at a saturation of 80
+        # "orange": "",          # Apparently unused, but the default is fine
+        # "yellow": "",          # The default yellow looks pretty good
+        "green": "#32ac66",      # Colour picked after Discord discussion
+        "turquoise": "#7289DA",  # Blurple, because Bulma uses this regardless of `primary` above
+        "blue": "#2482c1",       # Colour picked after Discord discussion
+        "cyan": "#2482c1",       # Colour picked after Discord discussion (matches the blue)
+        "purple": "#aa55e4",     # Apparently unused, but changed for consistency
+        "red": "#d63852",        # Colour picked after Discord discussion
 
         "link": "$primary",
 
@@ -407,5 +408,13 @@ AUTHENTICATION_BACKENDS = (
     'allauth.account.auth_backends.AuthenticationBackend',
 )
 
+ACCOUNT_ADAPTER = "pydis_site.utils.account.AccountAdapter"
+ACCOUNT_EMAIL_REQUIRED = False       # Undocumented allauth setting; don't require emails
 ACCOUNT_EMAIL_VERIFICATION = "none"  # No verification required; we don't use emails for anything
+
+# We use this validator because Allauth won't let us actually supply a list with no validators
+# in it, and we can't just give it a lambda - that'd be too easy, I suppose.
+ACCOUNT_USERNAME_VALIDATORS = "pydis_site.VALIDATORS"
+
 LOGIN_REDIRECT_URL = "home"
+SOCIALACCOUNT_ADAPTER = "pydis_site.utils.account.SocialAccountAdapter"
diff --git a/pydis_site/static/css/base/base.css b/pydis_site/static/css/base/base.css
index 3ca6b2a7..75702d47 100644
--- a/pydis_site/static/css/base/base.css
+++ b/pydis_site/static/css/base/base.css
@@ -84,7 +84,25 @@ div.card.has-equal-height {
 
 /* Fix for logout form submit button in navbar */
 
-button.is-size-navbar-menu {
+button.is-size-navbar-menu, a.is-size-navbar-menu {
     font-size: 14px;
+    padding-left: 1.5rem;
+    padding-right: 1.5rem;
 }
 
+@media screen and (min-width: 1088px) {
+    button.is-size-navbar-menu, a.is-size-navbar-menu {
+        padding-left: 1rem;
+        padding-right: 1rem;
+    }
+}
+
+/* Fix for modals being behind the navbar */
+
+.modal * {
+    z-index: 1020;
+}
+
+.modal-background {
+    z-index: 1010;
+}
diff --git a/pydis_site/static/js/base/modal.js b/pydis_site/static/js/base/modal.js
new file mode 100644
index 00000000..eccc8845
--- /dev/null
+++ b/pydis_site/static/js/base/modal.js
@@ -0,0 +1,100 @@
+/*
+ modal.js: A simple way to wire up Bulma modals.
+
+ This library is intended to be used with Bulma's modals, as described in the
+ official Bulma documentation. It's based on the JavaScript that Bulma
+ themselves use for this purpose on the modals documentation page.
+
+ Note that, just like that piece of JavaScript, this library assumes that
+ you will only ever want to have one modal open at once.
+ */
+
+"use strict";
+
+// Event handler for the "esc" key, for closing modals.
+
+document.addEventListener("keydown", (event) => {
+  const e = event || window.event;
+
+  if (e.code === "Escape" || e.keyCode === 27) {
+    closeModals();
+  }
+});
+
+// An array of all the modal buttons we've already set up
+
+const modal_buttons = [];
+
+// Public API functions
+
+function setupModal(target) {
+  // Set up a modal's events, given a DOM element. This can be
+  // used later in order to set up a modal that was added after
+  // this library has been run.
+
+  // We need to collect a bunch of elements to work with
+  const modal_background = Array.from(target.getElementsByClassName("modal-background"));
+  const modal_close = Array.from(target.getElementsByClassName("modal-close"));
+
+  const modal_head = Array.from(target.getElementsByClassName("modal-card-head"));
+  const modal_foot = Array.from(target.getElementsByClassName("modal-card-foot"));
+
+  const modal_delete = [];
+  const modal_button = [];
+
+  modal_head.forEach((element) => modal_delete.concat(Array.from(element.getElementsByClassName("delete"))));
+  modal_foot.forEach((element) => modal_button.concat(Array.from(element.getElementsByClassName("button"))));
+
+  // Collect all the elements that can be used to close modals
+  const modal_closers = modal_background.concat(modal_close).concat(modal_delete).concat(modal_button);
+
+  // Assign click events for closing modals
+  modal_closers.forEach((element) => {
+    element.addEventListener("click", () => {
+      closeModals();
+    });
+  });
+
+  setupOpeningButtons();
+}
+
+function setupOpeningButtons() {
+  // Wire up all the opening buttons, avoiding buttons we've already wired up.
+  const modal_opening_buttons = Array.from(document.getElementsByClassName("modal-button"));
+
+  modal_opening_buttons.forEach((element) => {
+    if (!modal_buttons.includes(element)) {
+      element.addEventListener("click", () => {
+        openModal(element.dataset.target);
+      });
+
+      modal_buttons.push(element);
+    }
+  });
+}
+
+function openModal(target) {
+  // Open a modal, given a string ID
+  const element = document.getElementById(target);
+
+  document.documentElement.classList.add("is-clipped");
+  element.classList.add("is-active");
+}
+
+function closeModals() {
+  // Close all open modals
+  const modals = Array.from(document.getElementsByClassName("modal"));
+  document.documentElement.classList.remove("is-clipped");
+
+  modals.forEach((element) => {
+    element.classList.remove("is-active");
+  });
+}
+
+(function () {
+  // Set up all the modals currently on the page
+  const modals = Array.from(document.getElementsByClassName("modal"));
+
+  modals.forEach((modal) => setupModal(modal));
+  setupOpeningButtons();
+}());
diff --git a/pydis_site/templates/base/base.html b/pydis_site/templates/base/base.html
index a9b31c0f..4c70d778 100644
--- a/pydis_site/templates/base/base.html
+++ b/pydis_site/templates/base/base.html
@@ -28,6 +28,7 @@
 
   {# Font-awesome here is defined explicitly so that we can have Pro #}
   <script src="https://kit.fontawesome.com/ae6a3152d8.js"></script>
+  <script src="{% static "js/base/modal.js" %}"></script>
 
   <link rel="stylesheet" href="{% static "css/base/base.css" %}">
   <link rel="stylesheet" href="{% static "css/base/notification.css" %}">
diff --git a/pydis_site/templates/base/navbar.html b/pydis_site/templates/base/navbar.html
index 8cdac0de..2ba5bdd4 100644
--- a/pydis_site/templates/base/navbar.html
+++ b/pydis_site/templates/base/navbar.html
@@ -102,7 +102,15 @@
           {% else %}
             <form method="post" action="{% url 'logout' %}">
               {% csrf_token %}
-              <button type="submit" class="navbar-item button is-white is-inline is-fullwidth has-text-left is-size-navbar-menu has-text-grey-dark">Logout</button>
+
+              <div class="field navbar-item is-paddingless is-fullwidth is-grouped">
+                <button type="submit" class="button is-white is-inline is-fullwidth has-text-left is-size-navbar-menu has-text-grey-dark">Logout</button>
+                <a title="Settings" class="button is-white is-inline has-text-right is-size-navbar-menu has-text-grey-dark modal-button" data-target="account-modal">
+                  <span class="is-icon">
+                    <i class="fas fa-cog"></i>
+                  </span>
+                </a>
+              </div>
             </form>
           {% endif %}
 
@@ -116,3 +124,24 @@
     </a>
   </div>
 </nav>
+
+{% if user.is_authenticated %}
+  <script defer type="text/javascript">
+    // Script which loads and sets up the account settings modal.
+    // This script must be placed in a template, or rewritten to take the fetch
+    // URL as a function argument, in order to be used.
+
+    "use strict";
+
+    // Create and prepend a new div for this modal
+    let element = document.createElement("div");
+    document.body.prepend(element);
+
+    fetch("{% url "account_settings" %}")   // Fetch the URL
+      .then((response) => response.text())  // Read in the data stream as text
+      .then((text) => {
+        element.outerHTML = text;  // Replace the div's HTML with the loaded modal HTML
+        setupModal(document.getElementById("account-modal"));  // Set up the modal
+      });
+  </script>
+{% endif %}
diff --git a/pydis_site/templates/home/account/delete.html b/pydis_site/templates/home/account/delete.html
new file mode 100644
index 00000000..1020a82b
--- /dev/null
+++ b/pydis_site/templates/home/account/delete.html
@@ -0,0 +1,44 @@
+{% extends 'base/base.html' %}
+
+{% load crispy_forms_tags %}
+{% load static %}
+
+{% block title %}Delete Account{% endblock %}
+
+{% block content %}
+  {% include "base/navbar.html" %}
+
+  <section class="section content">
+    <div class="container">
+      <h2 class="is-size-2 has-text-centered">Account Deletion</h2>
+
+      <div class="columns is-centered">
+        <div class="column is-half-desktop is-full-tablet is-full-mobile">
+
+          <article class="message is-danger">
+            <div class="message-body">
+              <p>
+                You have requested to delete the account with username
+                <strong><span class="has-text-dark is-family-monospace">{{ user.username }}</span></strong>.
+              </p>
+
+              <p>
+                Please note that this <strong>cannot be undone</strong>.
+              </p>
+
+              <p>
+                To verify that you'd like to remove your account, please type your username into the box below.
+              </p>
+            </div>
+          </article>
+        </div>
+      </div>
+
+      <div class="columns is-centered">
+        <div class="column is-half-desktop is-full-tablet is-full-mobile">
+          {% crispy form %}
+        </div>
+      </div>
+    </div>
+  </section>
+{% endblock %}
diff --git a/pydis_site/templates/home/account/settings.html b/pydis_site/templates/home/account/settings.html
new file mode 100644
index 00000000..9f48d736
--- /dev/null
+++ b/pydis_site/templates/home/account/settings.html
@@ -0,0 +1,137 @@
+{% load socialaccount %}
+
+{# This template is just for a modal, which is actually inserted into the navbar #}
+{# template. Take a look at `navbar.html` to see how it's inserted. #}
+
+<div class="modal" id="account-modal">
+  <div class="modal-background"></div>
+  <div class="modal-card">
+    <div class="modal-card-head">
+      <div class="modal-card-title">Settings for {{ user.username }}</div>
+
+      {% if groups %}
+        <div>
+          {% for group in groups %}
+            <span class="tag is-primary">{{ group.name }}</span>
+          {% endfor %}
+        </div>
+      {% else %}
+        <span class="tag is-dark">No groups</span>
+      {% endif %}
+    </div>
+    <div class="modal-card-body">
+      <h3 class="title">Connections</h3>
+      <div class="columns">
+        {% if discord_provider is not None %}
+          <div class="column">
+            <div class="box">
+              {% if not discord %}
+                <div class="media">
+                  <div class="media-left">
+                    <div class="image">
+                      <i class="fab fa-discord fa-3x has-text-primary"></i>
+                    </div>
+                  </div>
+                  <div class="media-content">
+                    <div class="title is-5">Discord</div>
+                    <div class="subtitle is-6">Not connected</div>
+                  </div>
+                </div>
+                <div>
+                  <br />
+                  <a class="button is-primary" href="{% provider_login_url "discord" process="connect" %}">
+                    <span class="icon">
+                      <i class="fad fa-link"></i>
+                    </span>
+                    <span>Connect</span>
+                  </a>
+                </div>
+              {% else %}
+                <div class="media">
+                  <div class="media-left">
+                    <div class="image">
+                      <i class="fab fa-discord fa-3x has-text-primary"></i>
+                    </div>
+                  </div>
+                  <div class="media-content">
+                    <div class="title is-5">Discord</div>
+                    <div class="subtitle is-6">{{ user.username }}</div>
+                  </div>
+                </div>
+                <div>
+                  <br />
+                  <button class="button" disabled>
+                    <span class="icon">
+                      <i class="fas fa-check"></i>
+                    </span>
+                    <span>Connected</span>
+                  </button>
+                </div>
+              {% endif %}
+            </div>
+          </div>
+        {% endif %}
+
+        {% if github_provider is not None %}
+          <div class="column">
+            <div class="box">
+              {% if not github %}
+                <div class="media">
+                  <div class="media-left">
+                    <div class="image">
+                      <i class="fab fa-github fa-3x"></i>
+                    </div>
+                  </div>
+                  <div class="media-content">
+                    <div class="title is-5">GitHub</div>
+                    <div class="subtitle is-6">Not connected</div>
+                  </div>
+                </div>
+                <div>
+                  <br />
+                  <a class="button is-primary" href="{% provider_login_url "github" process="connect" %}">
+                    <span class="icon">
+                      <i class="fad fa-link"></i>
+                    </span>
+                    <span>Connect</span>
+                  </a>
+                </div>
+              {% else %}
+                <div class="media">
+                  <div class="media-left">
+                    <div class="image">
+                      <i class="fab fa-github fa-3x"></i>
+                    </div>
+                  </div>
+                  <div class="media-content">
+                    <div class="title is-5">GitHub</div>
+                    <div class="subtitle is-6">{{ github.extra_data.name }}</div>
+                  </div>
+                </div>
+                <div>
+                  <form method="post" action="{% url "account_settings" %}" type="submit">
+                  {% csrf_token %}
+
+                  <input type="hidden" name="provider" value="github" />
+
+                  <br />
+                  <button type="submit" class="button is-danger">
+                    <span class="icon">
+                      <i class="fas fa-times"></i>
+                    </span>
+                    <span>Disconnect</span>
+                  </button>
+                </form>
+                </div>
+              {% endif %}
+            </div>
+          </div>
+        {% endif %}
+      </div>
+    </div>
+    <div class="modal-card-foot">
+      <a class="button is-danger" href="{% url "account_delete" %}">Delete Account</a>
+    </div>
+  </div>
+</div>
+
diff --git a/pydis_site/tests/test_utils_account.py b/pydis_site/tests/test_utils_account.py
new file mode 100644
index 00000000..d2946368
--- /dev/null
+++ b/pydis_site/tests/test_utils_account.py
@@ -0,0 +1,132 @@
+from unittest.mock import patch
+
+from allauth.exceptions import ImmediateHttpResponse
+from allauth.socialaccount.models import SocialAccount, SocialLogin
+from django.contrib.auth.models import User
+from django.contrib.messages.storage.base import BaseStorage
+from django.http import HttpRequest
+from django.test import TestCase
+
+from pydis_site.apps.api.models import Role, User as DiscordUser
+from pydis_site.utils.account import AccountAdapter, SocialAccountAdapter
+
+
+class AccountUtilsTests(TestCase):
+    def setUp(self):
+        self.django_user = User.objects.create(username="user")
+
+        self.discord_account = SocialAccount.objects.create(
+            user=self.django_user, provider="discord", uid=0
+        )
+
+        self.discord_account_role = SocialAccount.objects.create(
+            user=self.django_user, provider="discord", uid=1
+        )
+
+        self.discord_account_two_roles = SocialAccount.objects.create(
+            user=self.django_user, provider="discord", uid=2
+        )
+
+        self.discord_account_not_present = SocialAccount.objects.create(
+            user=self.django_user, provider="discord", uid=3
+        )
+
+        self.github_account = SocialAccount.objects.create(
+            user=self.django_user, provider="github", uid=0
+        )
+
+        self.discord_user = DiscordUser.objects.create(
+            id=0,
+            name="user",
+            discriminator=0
+        )
+
+        self.discord_user_role = DiscordUser.objects.create(
+            id=1,
+            name="user present",
+            discriminator=0
+        )
+
+        self.discord_user_two_roles = DiscordUser.objects.create(
+            id=2,
+            name="user with both roles",
+            discriminator=0
+        )
+
+        everyone_role = Role.objects.create(
+            id=0,
+            name="@everyone",
+            colour=0,
+            permissions=0,
+            position=0
+        )
+
+        self.discord_user_role.roles.add(everyone_role)
+        self.discord_user_two_roles.roles.add(everyone_role)
+
+        self.discord_user_two_roles.roles.add(Role.objects.create(
+            id=1,
+            name="Developers",
+            colour=0,
+            permissions=0,
+            position=1
+        ))
+
+    def test_account_adapter(self):
+        """Test that our Allauth account adapter functions correctly."""
+        adapter = AccountAdapter()
+
+        self.assertFalse(adapter.is_open_for_signup(HttpRequest()))
+
+    def test_social_account_adapter_signup(self):
+        """Test that our Allauth social account adapter correctly handles signups."""
+        adapter = SocialAccountAdapter()
+
+        discord_login = SocialLogin(account=self.discord_account)
+        discord_login_role = SocialLogin(account=self.discord_account_role)
+        discord_login_two_roles = SocialLogin(account=self.discord_account_two_roles)
+        discord_login_not_present = SocialLogin(account=self.discord_account_not_present)
+
+        github_login = SocialLogin(account=self.github_account)
+
+        messages_request = HttpRequest()
+        messages_request._messages = BaseStorage(messages_request)
+
+        with patch("pydis_site.utils.account.reverse") as mock_reverse:
+            with patch("pydis_site.utils.account.redirect") as mock_redirect:
+                with self.assertRaises(ImmediateHttpResponse):
+                    adapter.is_open_for_signup(messages_request, github_login)
+
+                with self.assertRaises(ImmediateHttpResponse):
+                    adapter.is_open_for_signup(messages_request, discord_login)
+
+                with self.assertRaises(ImmediateHttpResponse):
+                    adapter.is_open_for_signup(messages_request, discord_login_role)
+
+                with self.assertRaises(ImmediateHttpResponse):
+                    adapter.is_open_for_signup(messages_request, discord_login_not_present)
+
+                self.assertEqual(len(messages_request._messages._queued_messages), 4)
+                self.assertEqual(mock_redirect.call_count, 4)
+            self.assertEqual(mock_reverse.call_count, 4)
+
+        self.assertTrue(adapter.is_open_for_signup(HttpRequest(), discord_login_two_roles))
+
+    def test_social_account_adapter_populate(self):
+        """Test that our Allauth social account adapter correctly handles data population."""
+        adapter = SocialAccountAdapter()
+
+        discord_login = SocialLogin(
+            account=self.discord_account,
+            user=self.django_user
+        )
+
+        discord_login.account.extra_data["discriminator"] = "0000"
+
+        user = adapter.populate_user(
+            HttpRequest(), discord_login,
+            {"username": "user"}
+        )
+
+        self.assertEqual(user.username, "user#0000")
+        self.assertEqual(user.first_name, "user#0000")
diff --git a/pydis_site/utils/account.py b/pydis_site/utils/account.py
new file mode 100644
index 00000000..e64919de
--- /dev/null
+++ b/pydis_site/utils/account.py
@@ -0,0 +1,79 @@
+from typing import Any, Dict
+
+from allauth.account.adapter import DefaultAccountAdapter
+from allauth.exceptions import ImmediateHttpResponse
+from allauth.socialaccount.adapter import DefaultSocialAccountAdapter
+from allauth.socialaccount.models import SocialLogin
+from django.contrib.auth.models import User as DjangoUser
+from django.contrib.messages import ERROR, add_message
+from django.http import HttpRequest
+from django.shortcuts import redirect
+from django.urls import reverse
+
+from pydis_site.apps.api.models import User as DiscordUser
+
+ERROR_CONNECT_DISCORD = ("You must login with Discord before connecting another account. "
+                         "Your account details have not been saved.")
+ERROR_JOIN_DISCORD = ("Please join the Discord server and verify that you accept the rules and "
+                      "privacy policy.")
+
+
+class AccountAdapter(DefaultAccountAdapter):
+    """An Allauth account adapter that prevents signups via form submission."""
+
+    def is_open_for_signup(self, request: HttpRequest) -> bool:
+        """
+        Checks whether or not the site is open for signups.
+
+        We override this to always return False so that users may never sign up using
+        Allauth's signup form endpoints, to be on the safe side - since we only want users
+        to sign up using their Discord account.
+        """
+        return False
+
+
+class SocialAccountAdapter(DefaultSocialAccountAdapter):
+    """An Allauth SocialAccount adapter that prevents signups via non-Discord connections."""
+
+    def is_open_for_signup(self, request: HttpRequest, social_login: SocialLogin) -> bool:
+        """
+        Checks whether or not the site is open for signups.
+
+        We override this method in order to prevent users from creating a new account using
+        a non-Discord connection, as we require this connection for our users.
+        """
+        if social_login.account.provider != "discord":
+            add_message(request, ERROR, ERROR_CONNECT_DISCORD)
+
+            raise ImmediateHttpResponse(redirect(reverse("home")))
+
+        try:
+            user = DiscordUser.objects.get(id=int(social_login.account.uid))
+        except DiscordUser.DoesNotExist:
+            add_message(request, ERROR, ERROR_JOIN_DISCORD)
+
+            raise ImmediateHttpResponse(redirect(reverse("home")))
+
+        if user.roles.count() <= 1:
+            add_message(request, ERROR, ERROR_JOIN_DISCORD)
+
+            raise ImmediateHttpResponse(redirect(reverse("home")))
+
+        return True
+
+    def populate_user(self, request: HttpRequest,
+                      social_login: SocialLogin,
+                      data: Dict[str, Any]) -> DjangoUser:
+        """
+        Method used to populate a Django User with data.
+
+        We override this so that the Django user is created with the username#discriminator,
+        instead of just the username, as Django users must have unique usernames. For display
+        purposes, we also set the `name` key, which is used for `first_name` in the database.
+        """
+        if social_login.account.provider == "discord":
+            discriminator = social_login.account.extra_data["discriminator"]
+            data["username"] = f"{data['username']}#{discriminator}"
+            data["name"] = data["username"]
+
+        return super().populate_user(request, social_login, data)