Merge branch '54417-graphql-type-authorization' into 'master'

GraphQL Type authorization

Closes #54417

See merge request gitlab-org/gitlab-ce!25724

app/graphql/types/ci/pipeline_type.rb

@@ -3,10 +3,12 @@
 module Types
   module Ci
     class PipelineType < BaseObject
-      expose_permissions Types::PermissionTypes::Ci::Pipeline
-
       graphql_name 'Pipeline'
 
+      authorize :read_pipeline
+
+      expose_permissions Types::PermissionTypes::Ci::Pipeline
+
       field :id, GraphQL::ID_TYPE, null: false
       field :iid, GraphQL::ID_TYPE, null: false
 

app/graphql/types/issue_type.rb

@@ -2,10 +2,12 @@
 
 module Types
   class IssueType < BaseObject
-    expose_permissions Types::PermissionTypes::Issue
-
     graphql_name 'Issue'
 
+    authorize :read_issue
+
+    expose_permissions Types::PermissionTypes::Issue
+
     present_using IssuePresenter
 
     field :iid, GraphQL::ID_TYPE, null: false
@@ -15,16 +17,14 @@ module Types
 
     field :author, Types::UserType,
           null: false,
-          resolve: -> (obj, _args, _ctx) { Gitlab::Graphql::Loaders::BatchModelLoader.new(User, obj.author_id).find },
-          authorize: :read_user
+          resolve: -> (obj, _args, _ctx) { Gitlab::Graphql::Loaders::BatchModelLoader.new(User, obj.author_id).find }
 
     field :assignees, Types::UserType.connection_type, null: true
 
     field :labels, Types::LabelType.connection_type, null: true
     field :milestone, Types::MilestoneType,
           null: true,
-          resolve: -> (obj, _args, _ctx) { Gitlab::Graphql::Loaders::BatchModelLoader.new(Milestone, obj.milestone_id).find },
-          authorize: :read_milestone
+          resolve: -> (obj, _args, _ctx) { Gitlab::Graphql::Loaders::BatchModelLoader.new(Milestone, obj.milestone_id).find }
 
     field :due_date, Types::TimeType, null: true
     field :confidential, GraphQL::BOOLEAN_TYPE, null: false

app/graphql/types/merge_request_type.rb

@@ -2,12 +2,14 @@
 
 module Types
   class MergeRequestType < BaseObject
+    graphql_name 'MergeRequest'
+
+    authorize :read_merge_request
+
     expose_permissions Types::PermissionTypes::MergeRequest
 
     present_using MergeRequestPresenter
 
-    graphql_name 'MergeRequest'
-
     field :id, GraphQL::ID_TYPE, null: false
     field :iid, GraphQL::ID_TYPE, null: false
     field :title, GraphQL::STRING_TYPE, null: false
@@ -48,7 +50,7 @@ module Types
     field :downvotes, GraphQL::INT_TYPE, null: false
     field :subscribed, GraphQL::BOOLEAN_TYPE, method: :subscribed?, null: false
 
-    field :head_pipeline, Types::Ci::PipelineType, null: true, method: :actual_head_pipeline, authorize: :read_pipeline
+    field :head_pipeline, Types::Ci::PipelineType, null: true, method: :actual_head_pipeline
     field :pipelines, Types::Ci::PipelineType.connection_type,
           resolver: Resolvers::MergeRequestPipelinesResolver
   end

app/graphql/types/milestone_type.rb

@@ -4,6 +4,8 @@ module Types
   class MilestoneType < BaseObject
     graphql_name 'Milestone'
 
+    authorize :read_milestone
+
     field :description, GraphQL::STRING_TYPE, null: true
     field :title, GraphQL::STRING_TYPE, null: false
     field :state, GraphQL::STRING_TYPE, null: false

app/graphql/types/project_type.rb

@@ -2,10 +2,12 @@
 
 module Types
   class ProjectType < BaseObject
-    expose_permissions Types::PermissionTypes::Project
-
     graphql_name 'Project'
 
+    authorize :read_project
+
+    expose_permissions Types::PermissionTypes::Project
+
     field :id, GraphQL::ID_TYPE, null: false
 
     field :full_path, GraphQL::ID_TYPE, null: false
@@ -67,14 +69,12 @@ module Types
     field :merge_requests,
           Types::MergeRequestType.connection_type,
           null: true,
-          resolver: Resolvers::MergeRequestsResolver,
-          authorize: :read_merge_request
+          resolver: Resolvers::MergeRequestsResolver
 
     field :merge_request,
           Types::MergeRequestType,
           null: true,
-          resolver: Resolvers::MergeRequestsResolver.single,
-          authorize: :read_merge_request
+          resolver: Resolvers::MergeRequestsResolver.single
 
     field :issues,
           Types::IssueType.connection_type,
@@ -88,7 +88,7 @@ module Types
 
     field :pipelines,
           Types::Ci::PipelineType.connection_type,
-          null: false,
+          null: true,
           resolver: Resolvers::ProjectPipelinesResolver
   end
 end

app/graphql/types/query_type.rb

@@ -7,8 +7,7 @@ module Types
     field :project, Types::ProjectType,
           null: true,
           resolver: Resolvers::ProjectResolver,
-          description: "Find a project",
-          authorize: :read_project
+          description: "Find a project"
 
     field :metadata, Types::MetadataType,
           null: true,

app/graphql/types/user_type.rb

@@ -4,6 +4,8 @@ module Types
   class UserType < BaseObject
     graphql_name 'User'
 
+    authorize :read_user
+
     present_using UserPresenter
 
     field :name, GraphQL::STRING_TYPE, null: false

changelogs/unreleased/54417-graphql-type-authorization.yml

@@ -0,0 +1,5 @@
+---
+title: GraphQL Types can be made to always authorize access to resources of that Type
+merge_request: 25724
+author:
+type: added

config/initializers/graphql.rb

@@ -1,4 +1,7 @@
 # frozen_string_literal: true
 
+GraphQL::ObjectType.accepts_definitions(authorize: GraphQL::Define.assign_metadata_key(:authorize))
 GraphQL::Field.accepts_definitions(authorize: GraphQL::Define.assign_metadata_key(:authorize))
+
+GraphQL::Schema::Object.accepts_definition(:authorize)
 GraphQL::Schema::Field.accepts_definition(:authorize)

doc/development/api_graphql_styleguide.md

@@ -9,38 +9,6 @@ can be shared.
 It is also possible to add a `private_token` to the querystring, or
 add a `HTTP_PRIVATE_TOKEN` header.
 
-### Authorization
-
-Fields can be authorized using the same abilities used in the Rails
-app. This can be done by supplying the `authorize` option:
-
-```ruby
-module Types
-  class QueryType < BaseObject
-    graphql_name 'Query'
-
-    field :project, Types::ProjectType, null: true, resolver: Resolvers::ProjectResolver, authorize: :read_project
-  end
-end
-```
-
-Fields can be authorized against multiple abilities, in which case all
-ability checks must pass. This requires explicitly passing a block to `field`:
-
-```ruby
-field :project, Types::ProjectType, null: true, resolver: Resolvers::ProjectResolver do
-  authorize [:read_project, :another_ability]
-end
-```
-
-The object found by the resolve call is used for authorization.
-
-TIP: **Tip:**
-When authorizing collections, try to load only what the currently
-authenticated user is allowed to view with our existing finders first.
-This minimizes database queries and unnecessary authorization checks of
-the loaded records.
-
 ## Types
 
 When exposing a model through the GraphQL API, we do so by creating a
@@ -197,6 +165,114 @@ end
   policies at once. The fields for these will all have be non-nullable
   booleans with a default description.
 
+## Authorization
+
+Authorizations can be applied to both types and fields using the same
+abilities as in the Rails app.
+
+If the:
+
+- Currently authenticated user fails the authorization, the authorized
+resource will be returned as `null`.
+- Resource is part of a collection, the collection will be filtered to
+exclude the objects that the user's authorization checks failed against.
+
+TIP: **Tip:**
+Try to load only what the currently authenticated user is allowed to
+view with our existing finders first, without relying on authorization
+to filter the records. This minimizes database queries and unnecessary
+authorization checks of the loaded records.
+
+### Type authorization
+
+Authorize a type by passing an ability to the `authorize` method. All
+fields with the same type will be authorized by checking that the
+currently authenticated user has the required ability.
+
+For example, the following authorization ensures that the currently
+authenticated user can only see projects that they have the
+`read_project` ability for (so long as the project is returned in a
+field that uses `Types::ProjectType`):
+
+```ruby
+module Types
+  class ProjectType < BaseObject
+    authorize :read_project
+  end
+end
+```
+
+You can also authorize against multiple abilities, in which case all of
+the ability checks must pass.
+
+For example, the following authorization ensures that the currently
+authenticated user must have `read_project` and `another_ability`
+abilities to see a project:
+
+```ruby
+module Types
+  class ProjectType < BaseObject
+    authorize [:read_project, :another_ability]
+  end
+end
+```
+
+### Field authorization
+
+Fields can be authorized with the `authorize` option.
+
+For example, the following authorization ensures that the currently
+authenticated user must have the `owner_access` ability to see the
+project:
+
+```ruby
+module Types
+  class MyType < BaseObject
+    field :project, Types::ProjectType, null: true, resolver: Resolvers::ProjectResolver, authorize: :owner_access
+  end
+end
+```
+
+Fields can also be authorized against multiple abilities, in which case
+all of ability checks must pass. **Note:** This requires explicitly
+passing a block to `field`:
+
+```ruby
+module Types
+  class MyType < BaseObject
+    field :project, Types::ProjectType, null: true, resolver: Resolvers::ProjectResolver do
+      authorize [:owner_access, :another_ability]
+    end
+  end
+end
+```
+
+NOTE: **Note:** If the field's type already [has a particular
+authorization](#type-authorization) then there is no need to add that
+same authorization to the field.
+
+### Type and Field authorizations together
+
+Authorizations are cumulative, so where authorizations are defined on
+a field, and also on the field's type, then the currently authenticated
+user would need to pass all ability checks.
+
+In the following simplified example the currently authenticated user
+would need both `first_permission` and `second_permission` abilities in
+order to see the author of the issue.
+
+```ruby
+class UserType
+  authorize :first_permission
+end
+```
+
+```ruby
+class IssueType
+  field :author, UserType, authorize: :second_permission
+end
+```
+
 ## Resolvers
 
 To find objects to display in a field, we can add resolvers to

lib/gitlab/graphql/authorize/authorize_field_service.rb

@@ -0,0 +1,94 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Graphql
+    module Authorize
+      class AuthorizeFieldService
+        def initialize(field)
+          @field = field
+          @old_resolve_proc = @field.resolve_proc
+        end
+
+        def authorizations?
+          authorizations.present?
+        end
+
+        def authorized_resolve
+          proc do |obj, args, ctx|
+            resolved_obj = @old_resolve_proc.call(obj, args, ctx)
+            checker = build_checker(ctx[:current_user])
+
+            if resolved_obj.respond_to?(:then)
+              resolved_obj.then(&checker)
+            else
+              checker.call(resolved_obj)
+            end
+          end
+        end
+
+        private
+
+        def authorizations
+          @authorizations ||= (type_authorizations + field_authorizations).uniq
+        end
+
+        # Returns any authorize metadata from the return type of @field
+        def type_authorizations
+          type = @field.type
+
+          # When the return type of @field is a collection, find the singular type
+          if type.get_field('edges')
+            type = node_type_for_relay_connection(type)
+          elsif type.list?
+            type = node_type_for_basic_connection(type)
+          end
+
+          Array.wrap(type.metadata[:authorize])
+        end
+
+        # Returns any authorize metadata from @field
+        def field_authorizations
+          Array.wrap(@field.metadata[:authorize])
+        end
+
+        def build_checker(current_user)
+          lambda do |value|
+            # Load the elements if they were not loaded by BatchLoader yet
+            value = value.sync if value.respond_to?(:sync)
+
+            check = lambda do |object|
+              authorizations.all? do |ability|
+                Ability.allowed?(current_user, ability, object)
+              end
+            end
+
+            case value
+            when Array, ActiveRecord::Relation
+              value.select(&check)
+            else
+              value if check.call(value)
+            end
+          end
+        end
+
+        # Returns the singular type for relay connections.
+        # This will be the type class of edges.node
+        def node_type_for_relay_connection(type)
+          type = type.get_field('edges').type.unwrap.get_field('node')&.type
+
+          if type.nil?
+            raise Gitlab::Graphql::Errors::ConnectionDefinitionError,
+              'Connection Type must conform to the Relay Cursor Connections Specification'
+          end
+
+          type
+        end
+
+        # Returns the singular type for basic connections, for example `[Types::ProjectType]`
+        def node_type_for_basic_connection(type)
+          type.unwrap
+        end
+      end
+    end
+  end
+end

lib/gitlab/graphql/authorize/instrumentation.rb

@@ -7,46 +7,12 @@ module Gitlab
         # Replace the resolver for the field with one that will only return the
         # resolved object if the permissions check is successful.
         def instrument(_type, field)
-          required_permissions = Array.wrap(field.metadata[:authorize])
-          return field if required_permissions.empty?
+          service = AuthorizeFieldService.new(field)
 
-          old_resolver = field.resolve_proc
-
-          new_resolver = -> (obj, args, ctx) do
-            resolved_obj = old_resolver.call(obj, args, ctx)
-            checker = build_checker(ctx[:current_user], required_permissions)
-
-            if resolved_obj.respond_to?(:then)
-              resolved_obj.then(&checker)
-            else
-              checker.call(resolved_obj)
-            end
-          end
-
-          field.redefine do
-            resolve(new_resolver)
-          end
-        end
-
-        private
-
-        def build_checker(current_user, abilities)
-          lambda do |value|
-            # Load the elements if they weren't loaded by BatchLoader yet
-            value = value.sync if value.respond_to?(:sync)
-
-            check = lambda do |object|
-              abilities.all? do |ability|
-                Ability.allowed?(current_user, ability, object)
-              end
-            end
-
-            case value
-            when Array
-              value.select(&check)
-            else
-              value if check.call(value)
-            end
+          if service.authorizations?
+            field.redefine { resolve(service.authorized_resolve) }
+          else
+            field
           end
         end
       end

lib/gitlab/graphql/errors.rb

@@ -6,6 +6,7 @@ module Gitlab
       BaseError = Class.new(GraphQL::ExecutionError)
       ArgumentError = Class.new(BaseError)
       ResourceNotAvailable = Class.new(BaseError)
+      ConnectionDefinitionError = Class.new(BaseError)
     end
   end
 end

spec/graphql/features/authorization_spec.rb

@@ -5,61 +5,192 @@ require 'spec_helper'
 describe 'Gitlab::Graphql::Authorization' do
   set(:user) { create(:user) }
 
+  let(:permission_single) { :foo }
+  let(:permission_collection) { [:foo, :bar] }
   let(:test_object) { double(name: 'My name') }
-  let(:object_type) { object_type_class }
-  let(:query_type) { query_type_class(object_type, test_object) }
-  let(:schema) { schema_class(query_type) }
+  let(:query_string) { '{ object() { name } }' }
+  let(:result) { execute_query(query_type)['data'] }
 
-  let(:execute) do
-    schema.execute(
-      query_string,
-      context: { current_user: user },
-      variables: {}
-    )
+  subject { result['object'] }
+
+  shared_examples 'authorization with a single permission' do
+    it 'returns the protected field when user has permission' do
+      permit(permission_single)
+
+      expect(subject).to eq('name' => test_object.name)
+    end
+
+    it 'returns nil when user is not authorized' do
+      expect(subject).to be_nil
+    end
   end
 
-  let(:result) { execute['data'] }
+  shared_examples 'authorization with a collection of permissions' do
+    it 'returns the protected field when user has all permissions' do
+      permit(*permission_collection)
+
+      expect(subject).to eq('name' => test_object.name)
+    end
+
+    it 'returns nil when user only has one of the permissions' do
+      permit(permission_collection.first)
+
+      expect(subject).to be_nil
+    end
+
+    it 'returns nil when user only has none of the permissions' do
+      expect(subject).to be_nil
+    end
+  end
 
   before do
     # By default, disallow all permissions.
     allow(Ability).to receive(:allowed?).and_return(false)
   end
 
-  describe 'authorizing with a single permission' do
-    let(:query_string) { '{ singlePermission() { name } }' }
+  describe 'Field authorizations' do
+    let(:type) { type_factory }
 
-    subject { result['singlePermission'] }
+    describe 'with a single permission' do
+      let(:query_type) do
+        query_factory do |query|
+          query.field :object, type, null: true, resolve: ->(obj, args, ctx) { test_object }, authorize: permission_single
+        end
+      end
 
-    it 'should return the protected field when user has permission' do
-      permit(:foo)
-
-      expect(subject['name']).to eq(test_object.name)
+      include_examples 'authorization with a single permission'
     end
 
-    it 'should return nil when user is not authorized' do
-      expect(subject).to be_nil
+    describe 'with a collection of permissions' do
+      let(:query_type) do
+        permissions = permission_collection
+        query_factory do |qt|
+          qt.field :object, type, null: true, resolve: ->(obj, args, ctx) { test_object } do
+            authorize permissions
+          end
+        end
+      end
+
+      include_examples 'authorization with a collection of permissions'
     end
   end
 
-  describe 'authorizing with an Array of permissions' do
-    let(:query_string) { '{ permissionCollection() { name } }' }
-
-    subject { result['permissionCollection'] }
-
-    it 'should return the protected field when user has all permissions' do
-      permit(:foo, :bar)
-
-      expect(subject['name']).to eq(test_object.name)
+  describe 'Type authorizations' do
+    let(:query_type) do
+      query_factory do |query|
+        query.field :object, type, null: true, resolve: ->(obj, args, ctx) { test_object }
+      end
     end
 
-    it 'should return nil when user only has one of the permissions' do
-      permit(:foo)
+    describe 'with a single permission' do
+      let(:type) do
+        type_factory do |type|
+          type.authorize permission_single
+        end
+      end
 
-      expect(subject).to be_nil
+      include_examples 'authorization with a single permission'
     end
 
-    it 'should return nil when user only has none of the permissions' do
-      expect(subject).to be_nil
+    describe 'with a collection of permissions' do
+      let(:type) do
+        type_factory do |type|
+          type.authorize permission_collection
+        end
+      end
+
+      include_examples 'authorization with a collection of permissions'
+    end
+  end
+
+  describe 'type and field authorizations together' do
+    let(:permission_1) { permission_collection.first }
+    let(:permission_2) { permission_collection.last }
+
+    let(:type) do
+      type_factory do |type|
+        type.authorize permission_1
+      end
+    end
+
+    let(:query_type) do
+      query_factory do |query|
+        query.field :object, type, null: true, resolve: ->(obj, args, ctx) { test_object }, authorize: permission_2
+      end
+    end
+
+    include_examples 'authorization with a collection of permissions'
+  end
+
+  describe 'type authorizations when applied to a relay connection' do
+    let(:query_string) { '{ object() { edges { node { name } } } }' }
+
+    let(:type) do
+      type_factory do |type|
+        type.authorize permission_single
+      end
+    end
+
+    let(:query_type) do
+      query_factory do |query|
+        query.field :object, type.connection_type, null: true, resolve: ->(obj, args, ctx) { [test_object] }
+      end
+    end
+
+    subject { result.dig('object', 'edges') }
+
+    it 'returns the protected field when user has permission' do
+      permit(permission_single)
+
+      expect(subject).not_to be_empty
+      expect(subject.first['node']).to eq('name' => test_object.name)
+    end
+
+    it 'returns nil when user is not authorized' do
+      expect(subject).to be_empty
+    end
+  end
+
+  describe 'type authorizations when applied to a basic connection' do
+    let(:type) do
+      type_factory do |type|
+        type.authorize permission_single
+      end
+    end
+
+    let(:query_type) do
+      query_factory do |query|
+        query.field :object, [type], null: true, resolve: ->(obj, args, ctx) { [test_object] }
+      end
+    end
+
+    subject { result['object'].first }
+
+    include_examples 'authorization with a single permission'
+  end
+
+  describe 'when connections do not follow the correct specification' do
+    let(:query_string) { '{ object() { edges { node { name }} } }' }
+
+    let(:type) do
+      bad_node = type_factory do |type|
+        type.graphql_name 'BadNode'
+        type.field :bad_node, GraphQL::STRING_TYPE, null: true
+      end
+
+      type_factory do |type|
+        type.field :edges, [bad_node], null: true
+      end
+    end
+
+    let(:query_type) do
+      query_factory do |query|
+        query.field :object, type, null: true
+      end
+    end
+
+    it 'throws an error' do
+      expect { result }.to raise_error(Gitlab::Graphql::Errors::ConnectionDefinitionError)
     end
   end
 
@@ -71,36 +202,34 @@ describe 'Gitlab::Graphql::Authorization' do
     end
   end
 
-  def object_type_class
+  def type_factory
     Class.new(Types::BaseObject) do
-      graphql_name 'TestObject'
+      graphql_name 'TestType'
 
       field :name, GraphQL::STRING_TYPE, null: true
+
+      yield(self) if block_given?
     end
   end
 
-  def query_type_class(type, object)
+  def query_factory
     Class.new(Types::BaseObject) do
       graphql_name 'TestQuery'
 
-      field :single_permission, type,
-        null: true,
-        authorize: :foo,
-        resolve: ->(obj, args, ctx) { object }
-
-      field :permission_collection, type,
-        null: true,
-        resolve: ->(obj, args, ctx) { object } do
-        authorize [:foo, :bar]
-      end
+      yield(self) if block_given?
     end
   end
 
-  def schema_class(query)
-    Class.new(GraphQL::Schema) do
+  def execute_query(query_type)
+    schema = Class.new(GraphQL::Schema) do
       use Gitlab::Graphql::Authorize
-
-      query(query)
+      query(query_type)
     end
+
+    schema.execute(
+      query_string,
+      context: { current_user: user },
+      variables: {}
+    )
   end
 end

spec/graphql/types/issue_type_spec.rb

@@ -4,4 +4,6 @@ describe GitlabSchema.types['Issue'] do
   it { expect(described_class).to expose_permissions_using(Types::PermissionTypes::Issue) }
 
   it { expect(described_class.graphql_name).to eq('Issue') }
+
+  it { expect(described_class).to require_graphql_authorizations(:read_issue) }
 end

spec/graphql/types/merge_request_type_spec.rb

@@ -3,14 +3,9 @@ require 'spec_helper'
 describe GitlabSchema.types['MergeRequest'] do
   it { expect(described_class).to expose_permissions_using(Types::PermissionTypes::MergeRequest) }
 
-  describe 'head pipeline' do
-    it 'has a head pipeline field' do
-      expect(described_class).to have_graphql_field(:head_pipeline)
-    end
+  it { expect(described_class).to require_graphql_authorizations(:read_merge_request) }
 
-    it 'authorizes the field' do
-      expect(described_class.fields['headPipeline'])
-        .to require_graphql_authorizations(:read_pipeline)
-    end
+  describe 'nested head pipeline' do
+    it { expect(described_class).to have_graphql_field(:head_pipeline) }
   end
 end

spec/graphql/types/milestone_type_spec.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe GitlabSchema.types['Milestone'] do
+  it { expect(described_class.graphql_name).to eq('Milestone') }
+
+  it { expect(described_class).to require_graphql_authorizations(:read_milestone) }
+end

spec/graphql/types/project_type_spec.rb

@@ -5,19 +5,11 @@ describe GitlabSchema.types['Project'] do
 
   it { expect(described_class.graphql_name).to eq('Project') }
 
+  it { expect(described_class).to require_graphql_authorizations(:read_project) }
+
   describe 'nested merge request' do
     it { expect(described_class).to have_graphql_field(:merge_requests) }
     it { expect(described_class).to have_graphql_field(:merge_request) }
-
-    it 'authorizes the merge request' do
-      expect(described_class.fields['mergeRequest'])
-        .to require_graphql_authorizations(:read_merge_request)
-    end
-
-    it 'authorizes the merge requests' do
-      expect(described_class.fields['mergeRequests'])
-        .to require_graphql_authorizations(:read_merge_request)
-    end
   end
 
   describe 'nested issues' do

spec/graphql/types/query_type_spec.rb

@@ -15,10 +15,6 @@ describe GitlabSchema.types['Query'] do
       is_expected.to have_graphql_type(Types::ProjectType)
       is_expected.to have_graphql_resolver(Resolvers::ProjectResolver)
     end
-
-    it 'authorizes with read_project' do
-      is_expected.to require_graphql_authorizations(:read_project)
-    end
   end
 
   describe 'metadata field' do

spec/graphql/types/user_type_spec.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe GitlabSchema.types['User'] do
+  it { expect(described_class.graphql_name).to eq('User') }
+
+  it { expect(described_class).to require_graphql_authorizations(:read_user) }
+end

spec/lib/gitlab/graphql/authorize/authorize_field_service_spec.rb

@@ -2,13 +2,17 @@
 
 require 'spec_helper'
 
-describe Gitlab::Graphql::Authorize::Instrumentation do
+# Also see spec/graphql/features/authorization_spec.rb for
+# integration tests of AuthorizeFieldService
+describe Gitlab::Graphql::Authorize::AuthorizeFieldService do
   describe '#build_checker' do
     let(:current_user) { double(:current_user) }
     let(:abilities) { [double(:first_ability), double(:last_ability)] }
 
     let(:checker) do
-      described_class.new.__send__(:build_checker, current_user, abilities)
+      service = described_class.new(double(resolve_proc: proc {}))
+      allow(service).to receive(:authorizations).and_return(abilities)
+      service.__send__(:build_checker, current_user)
     end
 
     it 'returns a checker which checks for a single object' do
@@ -56,12 +60,14 @@ describe Gitlab::Graphql::Authorize::Instrumentation do
           .to contain_exactly(allowed)
       end
     end
+  end
 
-    def spy_ability_check_for(ability, object, passed: true)
-      expect(Ability)
-        .to receive(:allowed?)
-        .with(current_user, ability, object)
-        .and_return(passed)
-    end
+  private
+
+  def spy_ability_check_for(ability, object, passed: true)
+    expect(Ability)
+      .to receive(:allowed?)
+      .with(current_user, ability, object)
+      .and_return(passed)
   end
 end