Create route and domain method for creating a subscription

atst/domain/csp/cloud.py

@@ -341,6 +341,12 @@ class CloudProviderInterface:
         """
         raise NotImplementedError()
 
+    def create_subscription(self, environment):
+        """Returns True if a new subscription has been created or raises an
+        exception if an error occurs while creating a subscription.
+        """
+        raise NotImplementedError()
+
 
 class MockCloudProvider(CloudProviderInterface):
 
@@ -508,6 +514,11 @@ class MockCloudProvider(CloudProviderInterface):
 
         return self._maybe(12)
 
+    def create_subscription(self, environment):
+        self._maybe_raise(self.UNAUTHORIZED_RATE, GeneralCSPException)
+
+        return True
+
     def get_calculator_url(self):
         return "https://www.rackspace.com/en-us/calculator"
 

atst/routes/applications/settings.py

@@ -1,9 +1,10 @@
 from flask import (
+    current_app as app,
+    g,
     redirect,
     render_template,
     request as http_request,
     url_for,
-    g,
 )
 
 from .blueprint import applications_bp
@@ -522,3 +523,31 @@ def resend_invite(application_id, application_role_id):
             _anchor="application-members",
         )
     )
+
+
+@applications_bp.route(
+    "/environments/<environment_id>/add_subscription", methods=["POST"]
+)
+# TODO: decide what perms are needed to create a subscription
+@user_can(Permissions.EDIT_ENVIRONMENT, message="create new environment subscription")
+def create_subscription(environment_id):
+    environment = Environments.get(environment_id)
+
+    try:
+        app.csp.cloud.create_subscription(environment)
+
+    except GeneralCSPException:
+        flash("environment_subscription_failure")
+        return (
+            render_settings_page(application=environment.application, show_flash=True),
+            400,
+        )
+
+    return redirect(
+        url_for(
+            "applications.settings",
+            application_id=environment.application.id,
+            fragment="application-environments",
+            _anchor="application-environments",
+        )
+    )

atst/utils/flash.py

@@ -83,6 +83,11 @@ MESSAGES = {
         "message": "flash.environment.deleted.message",
         "category": "success",
     },
+    "environment_subscription_failure": {
+        "title": "flash.environment.subscription_failure.title",
+        "message": "flash.environment.subscription_failure.message",
+        "category": "error",
+    },
     "form_errors": {
         "title": "flash.form.errors.title",
         "message": "flash.form.errors.message",