Introduce a new CredentialTemplate model

Credentials now have a required CredentialType, which defines inputs
(i.e., username, password) and injectors (i.e., assign the username to
SOME_ENV_VARIABLE at job runtime)

This commit only implements the model changes necessary to support the
new inputs model, and includes code for the credential serializer that
allows backwards-compatible support for /api/v1/credentials/; tasks.py
still needs to be updated to actually respect CredentialType injectors.

This change *will* break the UI for credentials (because it needs to be
updated to use the new v2 endpoint).

see: #5877
see: #5876
see: #5805

awx/main/migrations/0039_v320_migrate_credentials_to_credentialtypes.py

@@ -0,0 +1,148 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+from django.conf import settings
+import taggit.managers
+import awx.main.fields
+from awx.main.migrations import _credentialtypes as credentialtypes
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('main', '0038_v320_data_migrations'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CredentialType',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('created', models.DateTimeField(default=None, editable=False)),
+                ('modified', models.DateTimeField(default=None, editable=False)),
+                ('description', models.TextField(default=b'', blank=True)),
+                ('name', models.CharField(max_length=512)),
+                ('kind', models.CharField(max_length=32, choices=[(b'machine', 'Machine'), (b'net', 'Network'), (b'scm', 'Source Control'), (b'cloud', 'Cloud')])),
+                ('managed_by_tower', models.BooleanField(default=False, editable=False)),
+                ('inputs', awx.main.fields.CredentialTypeInputField(default={}, blank=True)),
+                ('injectors', awx.main.fields.CredentialTypeInjectorField(default={}, blank=True)),
+                ('created_by', models.ForeignKey(related_name="{u'class': 'credentialtype', u'app_label': 'main'}(class)s_created+", on_delete=django.db.models.deletion.SET_NULL, default=None, editable=False, to=settings.AUTH_USER_MODEL, null=True)),
+                ('modified_by', models.ForeignKey(related_name="{u'class': 'credentialtype', u'app_label': 'main'}(class)s_modified+", on_delete=django.db.models.deletion.SET_NULL, default=None, editable=False, to=settings.AUTH_USER_MODEL, null=True)),
+                ('tags', taggit.managers.TaggableManager(to='taggit.Tag', through='taggit.TaggedItem', blank=True, help_text='A comma-separated list of tags.', verbose_name='Tags')),
+            ],
+            options={
+                'ordering': ('kind', 'name'),
+            },
+        ),
+        migrations.AlterModelOptions(
+            name='credential',
+            options={'ordering': ('name',)},
+        ),
+        migrations.AddField(
+            model_name='credential',
+            name='inputs',
+            field=awx.main.fields.CredentialInputField(default={}, blank=True),
+        ),
+        migrations.AddField(
+            model_name='credential',
+            name='credential_type',
+            field=models.ForeignKey(related_name='credentials', to='main.CredentialType', null=True),
+            preserve_default=False,
+        ),
+        migrations.AlterUniqueTogether(
+            name='credential',
+            unique_together=set([('organization', 'name', 'credential_type')]),
+        ),
+        migrations.RunPython(credentialtypes.create_tower_managed_credential_types),
+        # MIGRATION TODO: For each credential, look at the columns below to
+        # determine the appropriate CredentialType (and assign it).  Additionally,
+        # set `self.input` to the appropriate JSON blob
+        migrations.RemoveField(
+            model_name='credential',
+            name='authorize',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='authorize_password',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='become_method',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='become_password',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='become_username',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='client',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='cloud',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='domain',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='host',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='kind',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='password',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='project',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='secret',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='security_token',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='ssh_key_data',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='ssh_key_unlock',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='subscription',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='tenant',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='username',
+        ),
+        migrations.RemoveField(
+            model_name='credential',
+            name='vault_password',
+        ),
+        migrations.AlterUniqueTogether(
+            name='credentialtype',
+            unique_together=set([('name', 'kind')]),
+        ),
+        # MIGRATION TODO: Once credentials are migrated, alter the credential_type
+        # foreign key to be non-NULLable
+    ]

awx/main/migrations/_credentialtypes.py

@@ -0,0 +1,5 @@
+from awx.main.models import CredentialType
+
+
+def create_tower_managed_credential_types(apps, schema_editor):
+    CredentialType.setup_tower_managed_defaults()