Add ToolConfiguration model

Closes PLAT-3694

Test Plan:
- Run migrations
- Verify the new ToolConfiguration model
  requires settings to be present
- Verify the new ToolConfiguration model
  requires developer_key_id to be present.

Change-Id: Ic3977a3d01a5e133e8e775441844b78a40478339
Reviewed-on: https://gerrit.instructure.com/163799
Reviewed-by: Marc Alan Phillips <mphillips@instructure.com>
QA-Review: August Thornton <august@instructure.com>
Tested-by: Jenkins
Reviewed-by: Rob Orton <rob@instructure.com>
Product-Review: Weston Dransfield <wdransfield@instructure.com>

app/models/developer_key.rb

@@ -31,6 +31,7 @@ class DeveloperKey < ActiveRecord::Base
   has_many :context_external_tools
 
   has_one :tool_consumer_profile, :class_name => 'Lti::ToolConsumerProfile'
+  has_one :tool_configuration, class_name: 'Lti::ToolConfiguration'
   serialize :scopes, Array
 
   before_validation :validate_scopes!

app/models/lti/tool_configuration.rb

@@ -0,0 +1,24 @@
+#
+# Copyright (C) 2018 - 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/>.
+
+module Lti
+  class ToolConfiguration < ActiveRecord::Base
+    belongs_to :developer_key
+
+    validates :developer_key_id, :settings, presence: true
+  end
+end

db/migrate/20180910162447_create_tool_configurations.rb

@@ -0,0 +1,30 @@
+#
+# Copyright (C) 2018 - 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/>.
+
+class CreateToolConfigurations < ActiveRecord::Migration[5.1]
+  tag :predeploy
+
+  def change
+    create_table :lti_tool_configurations do |t|
+      t.references :developer_key, limit: 8, null: false, foreign_key: true, index: false
+      t.jsonb :settings, null: false
+      t.timestamps null: false
+    end
+
+    add_index :lti_tool_configurations, :developer_key_id, unique: true
+  end
+end

spec/models/lti/tool_configuration_spec.rb

@@ -0,0 +1,43 @@
+#
+# Copyright (C) 2018 - 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/>.
+#
+
+require File.expand_path(File.dirname(__FILE__) + '/../../spec_helper.rb')
+require_dependency 'lti/tool_configuration'
+
+module Lti
+  describe ToolConfiguration do
+    let(:tool_configuration) { Lti::ToolConfiguration.new }
+    let_once(:developer_key) { DeveloperKey.create }
+
+    describe 'validations' do
+      subject { tool_configuration.valid? }
+
+      context 'when "settings" is blank' do
+        before { tool_configuration.developer_key = developer_key }
+
+        it { is_expected.to eq false }
+      end
+
+      context 'when "developer_key_id" is blank' do
+        before { tool_configuration.settings = {foo: 'bar'} }
+
+        it { is_expected.to eq false }
+      end
+    end
+  end
+end