allow configuring token expiration for mobile apps

fixes FOO-2336

Change-Id: Ic7f555ae4d85b8b79c7114f43495a638ca2dead2
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/273587
Reviewed-by: Simon Williams <simon@instructure.com>
Reviewed-by: August Thornton <august@instructure.com>
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>

app/models/developer_key.rb

@@ -345,6 +345,17 @@ class DeveloperKey < ActiveRecord::Base
     end
   end
 
+  def mobile_app?
+    false
+  end
+
+  def tokens_expire_in
+    return nil unless mobile_app?
+
+    sessions_settings = Canvas::Plugin.find('sessions').settings || {}
+    sessions_settings[:mobile_timeout]&.to_f&.minutes
+  end
+
   private
 
   def validate_lti_fields

app/views/plugins/_sessions_timeout.html.erb

@@ -22,5 +22,9 @@
       <td><%= f.blabel :session_timeout, :en => "Time before session expires in minutes (20 minimum)" %></td>
       <td><%= f.text_field :session_timeout %></td>
     </tr>
+    <tr>
+      <td><%= f.blabel :mobile_timeout, :en => "Time before session expires in minutes (20 minimum) for mobile applications" %></td>
+      <td><%= f.text_field :mobile_timeout %></td>
+    </tr>
   </table>
 <% end %>

lib/canvas/oauth/token.rb

@@ -94,6 +94,9 @@ module Canvas::Oauth
                                                })
         @access_token.real_user = real_user if real_user && real_user != user
 
+        expires_in = key.tokens_expire_in
+        @access_token.permanent_expires_at = Time.now.utc + expires_in if expires_in
+
         @access_token.save!
 
         @access_token.clear_full_token! if @access_token.scoped_to?(['userinfo'])

lib/canvas/plugins/validators/sessions_validator.rb

@@ -20,11 +20,23 @@
 
 module Canvas::Plugins::Validators::SessionsValidator
   def self.validate(settings, plugin_setting)
-    timeout = settings["session_timeout"].to_f.minutes
-    if timeout.to_i < 20.minutes.to_i
-      plugin_setting.errors.add(:base, I18n.t('canvas.plugins.errors.login_expiration_minimum', 'Session expiration must be 20 minutes or greater'))
-    else
-      settings.to_hash.with_indifferent_access
+    settings_keys = %w[session_timeout mobile_timeout]
+    result = {}
+    settings_keys.each do |key|
+      if settings[key].blank?
+        result[key] = nil
+        next
+      end
+
+      timeout = settings[key].to_f.minutes
+      if timeout.to_i < 20.minutes.to_i
+        plugin_setting.errors.add(:base, I18n.t('canvas.plugins.errors.login_expiration_minimum',
+                                                'Session expiration must be 20 minutes or greater'))
+      end
+      result[key] = timeout.to_i / 60
     end
+    return unless plugin_setting.errors.empty?
+
+    result.with_indifferent_access
   end
 end

spec/lib/canvas/oauth/token_spec.rb

@@ -94,6 +94,7 @@ module Canvas::Oauth
         expect(token.access_token).to be_a AccessToken
         expect(user.access_tokens.reload.size).to eq 1
         expect(token.access_token.full_token).not_to be_empty
+        expect(token.access_token.permanent_expires_at).to be_nil
       end
 
       it 'creates a scoped access token' do
@@ -135,6 +136,12 @@ module Canvas::Oauth
         expect(token.access_token).to be_a AccessToken
         expect(token.access_token).not_to eq access_token
       end
+
+      it 'sets token to expire if the key is set to expire' do
+        allow(key).to receive(:mobile_app?).and_return(true)
+        allow(Canvas::Plugin).to receive(:find).with("sessions").and_return(double(settings: { mobile_timeout: 30 }))
+        expect(token.access_token.permanent_expires_at).not_to be_nil
+      end
     end
 
     describe '#create_access_token_if_needed' do