feat(migrations): add initial VPN and Device models

Introduce initial database migration to create VPN and Device models.
These models include fields for UUID primary keys, encrypted keys,
and subnet fields, with foreign key relations to user accounts and
VPN instances. This migration sets up essential entities for the VPN
module, providing the foundational structure for VPN and device
management.

coldbrew/vpn/migrations/0001_initial.py

@@ -0,0 +1,87 @@
+# Generated by Django 5.0.6 on 2024-07-12 06:39
+
+import coldbrew.vpn.fields
+import django.core.validators
+import django.db.models.deletion
+import encrypted_model_fields.fields
+import uuid
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="VPN",
+            fields=[
+                (
+                    "id",
+                    models.UUIDField(
+                        default=uuid.uuid4, primary_key=True, serialize=False
+                    ),
+                ),
+                ("name", models.CharField(max_length=128)),
+                (
+                    "port",
+                    models.IntegerField(
+                        blank=True,
+                        null=True,
+                        unique=True,
+                        validators=[
+                            django.core.validators.MinValueValidator(10000),
+                            django.core.validators.MaxValueValidator(40000),
+                        ],
+                    ),
+                ),
+                (
+                    "private_key",
+                    encrypted_model_fields.fields.EncryptedCharField(
+                        blank=True, null=True
+                    ),
+                ),
+                ("public_key", models.CharField(blank=True, max_length=128, null=True)),
+                (
+                    "ipv4_subnet",
+                    coldbrew.vpn.fields.SubnetField(max_length=43, unique=True),
+                ),
+                (
+                    "ipv6_subnet",
+                    coldbrew.vpn.fields.SubnetField(max_length=43, unique=True),
+                ),
+                (
+                    "owner",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+            ],
+        ),
+        migrations.CreateModel(
+            name="Device",
+            fields=[
+                (
+                    "id",
+                    models.UUIDField(
+                        default=uuid.uuid4, primary_key=True, serialize=False
+                    ),
+                ),
+                ("name", models.CharField(max_length=128)),
+                ("public_key", models.CharField(max_length=128)),
+                ("preshared_key", encrypted_model_fields.fields.EncryptedCharField()),
+                (
+                    "vpn",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE, to="vpn.vpn"
+                    ),
+                ),
+            ],
+        ),
+    ]