Downloadable Kubernetes configuration file

Kubernetes can use OpenStack application credentials for authentication.
Generate a kubeconfig file and make it available to download along with the
openrc and clouds.yaml files.

blueprint kubernetes-config-gen

Change-Id: I298370e7abf4f0d480bd5199060f24bab6d6daaa

doc/source/configuration/settings.rst

@@ -7,7 +7,7 @@ Settings Reference
 Introduction
 ============
 
-Horizon's settings broadly fall into three categories:
+Horizon's settings broadly fall into four categories:
 
 * `General Settings`_: this includes visual settings like the modal backdrop
   style, bug url and theme configuration, as well as settings that affect every
@@ -21,6 +21,8 @@ Horizon's settings broadly fall into three categories:
   should read the `Django settings documentation
   <https://docs.djangoproject.com/en/dev/topics/settings/>`_ to see the other
   options available to you.
+* `Other Settings`_: settings which do not fall into any of the above
+  categories.
 
 To modify your settings, you have two options:
 
@@ -2521,3 +2523,51 @@ Default: Absolute paths for `horizon/locale`, `openstack_auth/locale` and
 Django uses relative paths by default so it causes localization issues
 depending on your runtime settings. To avoid this we recommend to use absolute
 paths for directories with locales.
+
+Other Settings
+==============
+
+KUBECONFIG_ENABLED
+------------------
+
+.. versionadded:: TBD
+
+Default: ``False``
+
+Kubernetes clusters can use Keystone as an external identity provider.
+Horizon can generate a ``kubeconfig`` file from the application credentials
+control panel which can be used for authenticating with a Kubernetes cluster.
+This setting enables this behavior.
+
+.. seealso::
+
+   `KUBECONFIG_KUBERNETES_URL`_ and `KUBECONFIG_CERTIFICATE_AUTHORITY_DATA`_
+   to provide parameters for the ``kubeconfig`` file.
+
+KUBECONFIG_KUBERNETES_URL
+-------------------------
+
+.. versionadded:: TBD
+
+Default: ``""``
+
+A Kubernetes API endpoint URL to be included in the generated ``kubeconfig``
+file.
+
+.. seealso::
+
+   `KUBECONFIG_ENABLED`_ to enable the ``kubeconfig`` file generation.
+
+KUBECONFIG_CERTIFICATE_AUTHORITY_DATA
+-------------------------------------
+
+.. versionadded:: TBD
+
+Default: ``""``
+
+Kubernetes API endpoint certificate authority data to be included in the
+generated ``kubeconfig`` file.
+
+.. seealso::
+
+   `KUBECONFIG_ENABLED`_ to enable the ``kubeconfig`` file generation.

openstack_dashboard/dashboards/identity/application_credentials/forms.py

@@ -15,6 +15,8 @@
 import datetime
 import logging
 
+from django.conf import settings
+from django.forms import widgets
 from django.utils.translation import ugettext_lazy as _
 from django.views.decorators.debug import sensitive_variables
 
@@ -49,6 +51,10 @@ class CreateApplicationCredentialForm(forms.SelfHandlingForm):
         required=False)
     unrestricted = forms.BooleanField(label=_("Unrestricted (dangerous)"),
                                       required=False)
+    kubernetes_namespace = forms.CharField(max_length=255,
+                                           label=_("Kubernetes Namespace"),
+                                           initial="default",
+                                           required=False)
 
     def __init__(self, request, *args, **kwargs):
         self.next_view = kwargs.pop('next_view', None)
@@ -58,6 +64,8 @@ class CreateApplicationCredentialForm(forms.SelfHandlingForm):
         role_names = [role['name'] for role in role_list]
         role_choices = ((name, name) for name in role_names)
         self.fields['roles'].choices = role_choices
+        if not settings.KUBECONFIG_ENABLED:
+            self.fields['kubernetes_namespace'].widget = widgets.HiddenInput()
 
     # We have to protect the entire "data" dict because it contains the
     # secret string.
@@ -98,6 +106,8 @@ class CreateApplicationCredentialForm(forms.SelfHandlingForm):
             )
             self.request.session['application_credential'] = \
                 new_app_cred.to_dict()
+            (self.request.session['application_credential']
+                ['kubernetes_namespace']) = data['kubernetes_namespace']
             request.method = 'GET'
             return self.next_view.as_view()(request)
         except exceptions.Conflict:

openstack_dashboard/dashboards/identity/application_credentials/templates/application_credentials/_create.html

@@ -40,4 +40,12 @@
   actions, check "unrestricted".
   {% endblocktrans %}
   </p>
+  <p>
+  {% if kubeconfig_enabled %}
+  {% blocktrans trimmed %}
+  You can optionally provide a Kubernetes Namespace. It will be included in the
+  kubeconfig file which can be downloaded from the next screen.
+  {% endblocktrans %}
+  {% endif %}
+  </p>
 {% endblock %}

openstack_dashboard/dashboards/identity/application_credentials/templates/application_credentials/_success.html

@@ -31,5 +31,11 @@
         <span class="fa fa-download"></span>
         {{ download_clouds_yaml_label }}
     </a>
+    {% if download_kubeconfig_url %}
+    <a href="{{ download_kubeconfig_url }}" class="btn btn-default">
+        <span class="fa fa-download"></span>
+        {{ download_kubeconfig_label }}
+    </a>
+    {% endif %}
     <a onClick="location.href='{{cancel_url}}'" href="{{ cancel_url }}" class="btn btn-default">{{ cancel_label }}</a>
 {% endblock %}

openstack_dashboard/dashboards/identity/application_credentials/templates/application_credentials/kubeconfig.template

@@ -0,0 +1,26 @@
+apiVersion: v1
+kind: Config
+clusters:
+- name: kubernetes
+  cluster:
+    server: {{ kubernetes_url }}
+    certificate-authority-data: {{ kubernetes_certificate_authority_data }}
+contexts:
+- name: kubernetes
+  context:
+    cluster: kubernetes
+    user: {{ user }}
+    namespace: {{ kubernetes_namespace }}
+current-context: kubernetes
+users:
+  - name: {{ user }}
+    user:
+      exec:
+        apiVersion: client.authentication.k8s.io/v1beta1
+        command: bin/kubectl-keystone-auth
+        args:
+        - "--keystone-url={{ auth_url }}
+        - "--domain-name=none"
+        - "--user-name={{ user }}"
+        - "--application-credential-id={{ application_credential_id }}"
+        - "--application-credential-secret={{ application_credential_secret }}"

openstack_dashboard/dashboards/identity/application_credentials/urls.py

@@ -28,6 +28,8 @@ urlpatterns = [
         views.CreateSuccessfulView.as_view(), name='success'),
     url(r'^download_openrc/$',
         views.download_rc_file, name='download_openrc'),
+    url(r'^download_kubeconfig/$',
+        views.download_kubeconfig_file, name='download_kubeconfig'),
     url(r'^download_clouds_yaml/$',
         views.download_clouds_yaml_file, name='download_clouds_yaml'),
 ]

openstack_dashboard/dashboards/identity/application_credentials/views.py

@@ -86,6 +86,11 @@ class CreateView(forms.ModalFormView):
         kwargs['next_view'] = CreateSuccessfulView
         return kwargs
 
+    def get_context_data(self, **kwargs):
+        context = super(CreateView, self).get_context_data(**kwargs)
+        context['kubeconfig_enabled'] = settings.KUBECONFIG_ENABLED
+        return context
+
 
 class CreateSuccessfulView(forms.ModalFormView):
     template_name = 'identity/application_credentials/success.html'
@@ -97,15 +102,20 @@ class CreateSuccessfulView(forms.ModalFormView):
     cancel_label = _("Close")
     download_openrc_label = _("Download openrc file")
     download_clouds_yaml_label = _("Download clouds.yaml")
+    download_kubeconfig_label = _("Download kubeconfig file")
 
     def get_context_data(self, **kwargs):
         context = super(CreateSuccessfulView, self).get_context_data(**kwargs)
         context['download_openrc_label'] = self.download_openrc_label
         context['download_clouds_yaml_label'] = self.download_clouds_yaml_label
+        context['download_kubeconfig_label'] = self.download_kubeconfig_label
         context['download_openrc_url'] = reverse(
             'horizon:identity:application_credentials:download_openrc')
         context['download_clouds_yaml_url'] = reverse(
             'horizon:identity:application_credentials:download_clouds_yaml')
+        if settings.KUBECONFIG_ENABLED:
+            context['download_kubeconfig_url'] = reverse(
+                'horizon:identity:application_credentials:download_kubeconfig')
         return context
 
     def get_initial(self):
@@ -125,12 +135,18 @@ def _get_context(request):
     interface = 'public'
     region = getattr(request.user, 'services_region', '')
     app_cred = request.session['application_credential']
-    context = dict(auth_url=auth_url,
-                   interface=interface,
-                   region=region,
-                   application_credential_id=app_cred['id'],
-                   application_credential_name=app_cred['name'],
-                   application_credential_secret=app_cred['secret'])
+    context = {
+        'auth_url': auth_url,
+        'interface': interface,
+        'region': region,
+        'user': request.user,
+        'application_credential_id': app_cred['id'],
+        'application_credential_name': app_cred['name'],
+        'application_credential_secret': app_cred['secret'],
+        'kubernetes_namespace': app_cred['kubernetes_namespace'],
+        'kubernetes_url': settings.KUBECONFIG_KUBERNETES_URL,
+        'kubernetes_certificate_authority_data':
+            settings.KUBECONFIG_CERTIFICATE_AUTHORITY_DATA}
     return context
 
 
@@ -166,6 +182,14 @@ def download_clouds_yaml_file(request):
     return _render_attachment(filename, template, context, request)
 
 
+def download_kubeconfig_file(request):
+    context = _get_context(request)
+    template = 'identity/application_credentials/kubeconfig.template'
+    filename = 'app-cred-%s-kubeconfig' % context['application_credential_name']
+    response = _render_attachment(filename, template, context, request)
+    return response
+
+
 class DetailView(views.HorizonTemplateView):
     template_name = 'identity/application_credentials/detail.html'
     page_title = "{{ application_credential.name }}"

openstack_dashboard/defaults.py

@@ -374,3 +374,11 @@ REST_API_REQUIRED_SETTINGS = [
 # and are not encrypted on the browser. This is an experimental API and
 # may be deprecated in the future without notice.
 REST_API_ADDITIONAL_SETTINGS = []
+
+# Kubernetes clusters can use Keystone as an external identity provider.
+# Horizon can generate a 'kubeconfig' file from the application credentials
+# control panel which can be used for authenticating with a Kubernetes cluster.
+# These settings control the kubeconfig parameters.
+KUBECONFIG_ENABLED = False
+KUBECONFIG_KUBERNETES_URL = ""
+KUBECONFIG_CERTIFICATE_AUTHORITY_DATA = ""

releasenotes/notes/bp-kubernetes-config-gen-bcebcbd8f9fb9991.yaml

@@ -0,0 +1,8 @@
+---
+features:
+  - |
+    [`blueprint kubernetes-config-gen <https://blueprints.launchpad.net/horizon/+spec/kubernetes-config-gen>`_]
+    Horizon now supports the optional automatic generation of a Kubernetes
+    configuration file (kubeconfig) based on application credentials. Adds
+    a new download button for this purpose in the application credentials
+    creation dialog.