flows/*: Initial flows stage1 implementation

passbook/policies/apps.py

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+"""passbook policies app config"""
+from django.apps import AppConfig
+
+
+class PassbookPoliciesConfig(AppConfig):
+    """passbook policies app config"""
+
+    name = "passbook.policies"
+    label = "passbook_policies"
+    verbose_name = "passbook Policies"

passbook/policies/migrations/0001_initial.py

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+# Generated by Django 3.0.3 on 2020-05-07 18:35
+
+import uuid
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ("passbook_core", "0011_auto_20200222_1822"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="PolicyBinding",
+            fields=[
+                (
+                    "uuid",
+                    models.UUIDField(
+                        default=uuid.uuid4,
+                        editable=False,
+                        primary_key=True,
+                        serialize=False,
+                    ),
+                ),
+                ("enabled", models.BooleanField(default=True)),
+                ("order", models.IntegerField(default=0)),
+                (
+                    "policy",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="+",
+                        to="passbook_core.Policy",
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name": "Policy Binding",
+                "verbose_name_plural": "Policy Bindings",
+            },
+        ),
+        migrations.CreateModel(
+            name="PolicyBindingModel",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "policies",
+                    models.ManyToManyField(
+                        related_name="_policybindingmodel_policies_+",
+                        through="passbook_policies.PolicyBinding",
+                        to="passbook_core.Policy",
+                    ),
+                ),
+            ],
+        ),
+        migrations.AddField(
+            model_name="policybinding",
+            name="target",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="+",
+                to="passbook_policies.PolicyBindingModel",
+            ),
+        ),
+    ]

passbook/policies/models.py

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+"""Policy base models"""
+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+from passbook.core.models import Policy
+from passbook.lib.models import UUIDModel
+
+
+class PolicyBindingModel(models.Model):
+    """Base Model for objects which have Policies applied to them"""
+
+    policies = models.ManyToManyField(Policy, through="PolicyBinding", related_name="+")
+
+
+class PolicyBinding(UUIDModel):
+    """Relationship between a Policy and a PolicyBindingModel."""
+
+    enabled = models.BooleanField(default=True)
+
+    policy = models.ForeignKey(Policy, on_delete=models.CASCADE, related_name="+")
+    target = models.ForeignKey(
+        PolicyBindingModel, on_delete=models.CASCADE, related_name="+"
+    )
+
+    # default value and non-unique for compatibility
+    order = models.IntegerField(default=0)
+
+    class Meta:
+
+        verbose_name = _("Policy Binding")
+        verbose_name_plural = _("Policy Bindings")