`AccessTokenValidationService` accepts `String` or `API::Scope` scopes.

- There's no need to use `API::Scope` for scopes that don't have `if`
  conditions, such as in `lib/gitlab/auth.rb`.

app/services/access_token_validation_service.rb

@@ -37,7 +37,14 @@ class AccessTokenValidationService
       # small number of records involved.
       # https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12300/#note_33689006
       token_scopes = token.scopes.map(&:to_sym)
-      required_scopes.any? { |scope| scope.sufficient?(token_scopes, request) }
+
+      required_scopes.any? do |scope|
+        if scope.respond_to?(:sufficient?)
+          scope.sufficient?(token_scopes, request)
+        else
+          API::Scope.new(scope).sufficient?(token_scopes, request)
+        end
+      end
     end
   end
 end

lib/api/scope.rb

@@ -11,7 +11,7 @@ module API
     # Are the `scopes` passed in sufficient to adequately authorize the passed
     # request for the scope represented by the current instance of this class?
     def sufficient?(scopes, request)
-      verify_if_condition(request) && scopes.include?(self.name)
+      scopes.include?(self.name) && verify_if_condition(request)
     end
 
     private

lib/gitlab/auth.rb

@@ -140,7 +140,6 @@ module Gitlab
       end
 
       def valid_scoped_token?(token, scopes)
-        scopes = scopes.map { |scope| API::Scope.new(scope) }
         AccessTokenValidationService.new(token).include_any_scope?(scopes)
       end
 

spec/services/access_token_validation_service_spec.rb

@@ -6,28 +6,28 @@ describe AccessTokenValidationService, services: true do
 
     it "returns true if the required scope is present in the token's scopes" do
       token = double("token", scopes: [:api, :read_user])
-      scopes = [API::Scope.new(:api)]
+      scopes = [:api]
 
       expect(described_class.new(token, request: request).include_any_scope?(scopes)).to be(true)
     end
 
     it "returns true if more than one of the required scopes is present in the token's scopes" do
       token = double("token", scopes: [:api, :read_user, :other_scope])
-      scopes = [API::Scope.new(:api), API::Scope.new(:other_scope)]
+      scopes = [:api, :other_scope]
 
       expect(described_class.new(token, request: request).include_any_scope?(scopes)).to be(true)
     end
 
     it "returns true if the list of required scopes is an exact match for the token's scopes" do
       token = double("token", scopes: [:api, :read_user, :other_scope])
-      scopes = [API::Scope.new(:api), API::Scope.new(:read_user), API::Scope.new(:other_scope)]
+      scopes = [:api, :read_user, :other_scope]
 
       expect(described_class.new(token, request: request).include_any_scope?(scopes)).to be(true)
     end
 
     it "returns true if the list of required scopes contains all of the token's scopes, in addition to others" do
       token = double("token", scopes: [:api, :read_user])
-      scopes = [API::Scope.new(:api), API::Scope.new(:read_user), API::Scope.new(:other_scope)]
+      scopes = [:api, :read_user, :other_scope]
 
       expect(described_class.new(token, request: request).include_any_scope?(scopes)).to be(true)
     end
@@ -41,7 +41,7 @@ describe AccessTokenValidationService, services: true do
 
     it "returns false if there are no scopes in common between the required scopes and the token scopes" do
       token = double("token", scopes: [:api, :read_user])
-      scopes = [API::Scope.new(:other_scope)]
+      scopes = [:other_scope]
 
       expect(described_class.new(token, request: request).include_any_scope?(scopes)).to be(false)
     end
@@ -56,7 +56,7 @@ describe AccessTokenValidationService, services: true do
 
       it "does not ignore scopes whose `if` condition is not set" do
         token = double("token", scopes: [:api, :read_user])
-        scopes = [API::Scope.new(:api, if: ->(_) { false }), API::Scope.new(:read_user)]
+        scopes = [API::Scope.new(:api, if: ->(_) { false }), :read_user]
 
         expect(described_class.new(token, request: request).include_any_scope?(scopes)).to be(true)
       end