spec: Create a provider state for OAuth requests

This will accept any incoming request for an oauth token
and respond with a newly-created developer key for the
default account.

refs PLAT-5032

Change-Id: Ice58d5d76bcd3212ae42a400c0305fada228ce5e
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/214143
Tested-by: Jenkins
Reviewed-by: Marc Phillips <mphillips@instructure.com>
QA-Review: Tucker Mcknight <tmcknight@instructure.com>
Product-Review: Tucker Mcknight <tmcknight@instructure.com>

spec/contracts/service_consumers/api/provider_states_for_consumer/oauth_provider_states.rb

@@ -0,0 +1,57 @@
+#
+# Copyright (C) 2019 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Pact.provider_states_for PactConfig::Consumers::ALL do
+
+  provider_state 'an account with an LTI developer key' do
+    set_up do
+      account = Pact::Canvas.base_state.account
+      jwk = {
+          "kty" => 'RSA',
+          "e" => 'test',
+          "n" => 'test',
+          "kid" => 'test',
+          "alg" => 'RS256',
+          "use" => 'test',
+          "iss" => 'test',
+          "aud" => 'http://example.org/login/oauth2/token',
+          "sub" => 'test',
+          "exp" => (Time.zone.now + 10.minutes).to_i,
+          "iat" => Time.zone.now.to_i,
+          "jti" => 'test',
+        }
+      developer_key = account.developer_keys.create!(
+        public_jwk: jwk,
+        public_jwk_url: 'example.org',
+        scopes: [
+          "https://canvas.instructure.com/lti/public_jwk/scope/update",
+          "https://canvas.instructure.com/lti/data_services/scope/create",
+          "https://canvas.instructure.com/lti/data_services/scope/show",
+          "https://canvas.instructure.com/lti/data_services/scope/update",
+          "https://canvas.instructure.com/lti/data_services/scope/list",
+          "https://canvas.instructure.com/lti/data_services/scope/destroy",
+          "https://canvas.instructure.com/lti/data_services/scope/list_event_types",
+        ]
+      )
+      allow_any_instance_of(Canvas::Oauth::Provider).
+        to receive(:key).and_return(developer_key)
+
+      allow_any_instance_of(Canvas::Oauth::ClientCredentialsProvider).
+        to receive(:get_jwk_from_url).and_return(jwk)
+    end
+  end
+end