OAuthServer - default "whoami" scope and refine scope-asking workflow

Summary: Ref T7153. The "whoami" scope should be default and always on, because otherwise we can't do anything at all. Also, if a client doesn't want a certain scope, don't bother asking the user for it. To get there, had to add "scope" to the definition of a client.

Test Plan: applied the patch to a phabricator "client" and a phabricator "server" as far as oauth shenanigans go. Then I tried to login / register with oauth. If the "client" was configured to ask for "always on" access I got that in the dialogue, and otherwise no additional scope questions were present. Verified scope was properly granted in either case.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7153

Differential Revision: https://secure.phabricator.com/D11705

src/applications/oauthserver/PhabricatorOAuthServerScope.php

@@ -18,24 +18,44 @@ final class PhabricatorOAuthServerScope {
     );
   }
 
-  static public function getCheckboxControl($current_scopes) {
+  static public function getDefaultScope() {
+    return self::SCOPE_WHOAMI;
+  }
+
+  static public function getCheckboxControl(
+    array $current_scopes) {
+
+    $have_options = false;
     $scopes = self::getScopesDict();
     $scope_keys = array_keys($scopes);
     sort($scope_keys);
+    $default_scope = self::getDefaultScope();
 
     $checkboxes = new AphrontFormCheckboxControl();
     foreach ($scope_keys as $scope) {
+      if ($scope == $default_scope) {
+        continue;
+      }
+      if (!isset($current_scopes[$scope])) {
+        continue;
+      }
+
       $checkboxes->addCheckbox(
         $name = $scope,
         $value = 1,
         $label = self::getCheckboxLabel($scope),
         $checked = isset($current_scopes[$scope]));
+      $have_options = true;
     }
-    $checkboxes->setLabel('Scope');
 
+    if ($have_options) {
+      $checkboxes->setLabel(pht('Scope'));
       return $checkboxes;
     }
 
+    return null;
+  }
+
   static private function getCheckboxLabel($scope) {
     $label = null;
     switch ($scope) {
@@ -58,6 +78,7 @@ final class PhabricatorOAuthServerScope {
         $requested_scopes[$scope] = 1;
       }
     }
+    $requested_scopes[self::getDefaultScope()] = 1;
     return $requested_scopes;
   }
 

src/applications/oauthserver/controller/PhabricatorOAuthServerAuthController.php

@@ -13,7 +13,7 @@ final class PhabricatorOAuthServerAuthController
 
     $server        = new PhabricatorOAuthServer();
     $client_phid   = $request->getStr('client_id');
-    $scope         = $request->getStr('scope', array());
+    $scope         = $request->getStr('scope');
     $redirect_uri  = $request->getStr('redirect_uri');
     $response_type = $request->getStr('response_type');
 
@@ -119,6 +119,13 @@ final class PhabricatorOAuthServerAuthController
               phutil_tag('strong', array(), 'scope')));
         }
         $scope = PhabricatorOAuthServerScope::scopesListToDict($scope);
+      } else {
+        return $this->buildErrorResponse(
+          'invalid_request',
+          pht('Malformed Request'),
+          pht(
+            'Required parameter %s was not present in the request.',
+            phutil_tag('strong', array(), 'scope')));
       }
 
       // NOTE: We're always requiring a confirmation dialog to redirect.
@@ -130,7 +137,6 @@ final class PhabricatorOAuthServerAuthController
       list($is_authorized, $authorization) = $auth_info;
 
       if ($request->isFormPost()) {
-        // TODO: We should probably validate this more? It feels a little funky.
         $scope = PhabricatorOAuthServerScope::getScopesFromRequest($request);
 
         if ($authorization) {
@@ -194,11 +200,8 @@ final class PhabricatorOAuthServerAuthController
     }
 
     // Here, we're confirming authorization for the application.
-
-    if ($scope) {
     if ($authorization) {
-        $desired_scopes = array_merge($scope,
+      $desired_scopes = array_merge($scope, $authorization->getScope());
-                                      $authorization->getScope());
     } else {
       $desired_scopes = $scope;
     }
@@ -208,12 +211,6 @@ final class PhabricatorOAuthServerAuthController
         pht('Invalid Scope'),
         pht('The requested scope is invalid, unknown, or malformed.'));
     }
-    } else {
-      $desired_scopes = array(
-        PhabricatorOAuthServerScope::SCOPE_WHOAMI         => 1,
-        PhabricatorOAuthServerScope::SCOPE_OFFLINE_ACCESS => 1,
-      );
-    }
 
     $form = id(new AphrontFormView())
       ->addHiddenInput('client_id', $client_phid)