Complete base flow for TOTP setup

- Includes DB storage and code validation.
- Extracted TOTP work to its own service file.
- Still needs testing to cover this side of things.

resources/lang/en/activities.php

@@ -47,6 +47,9 @@ return [
     'favourite_add_notification' => '":name" has been added to your favourites',
     'favourite_remove_notification' => '":name" has been removed from your favourites',
 
+    // MFA
+    'mfa_setup_method_notification' => 'Multi-factor method successfully configured',
+
     // Other
     'commented_on'                => 'commented on',
     'permissions_update'          => 'updated permissions',

resources/lang/en/validation.php

@@ -98,6 +98,7 @@ return [
     ],
     'string'               => 'The :attribute must be a string.',
     'timezone'             => 'The :attribute must be a valid zone.',
+    'totp'                 => 'The provided code is not valid or has expired.',
     'unique'               => 'The :attribute has already been taken.',
     'url'                  => 'The :attribute format is invalid.',
     'uploaded'             => 'The file could not be uploaded. The server may not accept files of this size.',

resources/views/mfa/setup.blade.php

@@ -20,7 +20,15 @@
                         </p>
                     </div>
                     <div class="pt-m">
-                        <a href="{{ url('/mfa/totp-generate') }}" class="button outline">Setup</a>
+                        @if($userMethods->has('totp'))
+                            <div class="text-pos">
+                                @icon('check-circle')
+                                Already configured
+                            </div>
+                            <a href="{{ url('/mfa/totp-generate') }}" class="button outline small">Reconfigure</a>
+                        @else
+                            <a href="{{ url('/mfa/totp-generate') }}" class="button outline">Setup</a>
+                        @endif
                     </div>
                 </div>