8 files changed, 196 insertions, 0 deletions
diff --git a/app/graphql/mutations/concerns/mutations/resolves_group.rb b/app/graphql/mutations/concerns/mutations/resolves_group.rb
new file mode 100644
index 00000000000..4306ce512f1
--- /dev/null
+++ b/app/graphql/mutations/concerns/mutations/resolves_group.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module Mutations
+  module ResolvesGroup
+    extend ActiveSupport::Concern
+
+    def resolve_group(full_path:)
+      resolver.resolve(full_path: full_path)
+    end
+
+    def resolver
+      Resolvers::GroupResolver.new(object: nil, context: context)
+    end
+  end
+end
diff --git a/app/graphql/resolvers/todo_resolver.rb b/app/graphql/resolvers/todo_resolver.rb
new file mode 100644
index 00000000000..38a4539f34a
--- /dev/null
+++ b/app/graphql/resolvers/todo_resolver.rb
@@ -0,0 +1,90 @@
+# frozen_string_literal: true
+
+module Resolvers
+  class TodoResolver < BaseResolver
+    type Types::TodoType, null: true
+
+    alias_method :user, :object
+
+    argument :action, [Types::TodoActionEnum],
+             required: false,
+             description: 'The action to be filtered'
+
+    argument :author_id, [GraphQL::ID_TYPE],
+             required: false,
+             description: 'The ID of an author'
+
+    argument :project_id, [GraphQL::ID_TYPE],
+             required: false,
+             description: 'The ID of a project'
+
+    argument :group_id, [GraphQL::ID_TYPE],
+             required: false,
+             description: 'The ID of a group'
+
+    argument :state, [Types::TodoStateEnum],
+             required: false,
+             description: 'The state of the todo'
+
+    argument :type, [Types::TodoTargetEnum],
+             required: false,
+             description: 'The type of the todo'
+
+    def resolve(**args)
+      return Todo.none if user != context[:current_user]
+
+      TodosFinder.new(user, todo_finder_params(args)).execute
+    end
+
+    private
+
+    # TODO: Support multiple queries for e.g. state and type on TodosFinder:
+    #
+    # https://gitlab.com/gitlab-org/gitlab/merge_requests/18487
+    # https://gitlab.com/gitlab-org/gitlab/merge_requests/18518
+    #
+    # As soon as these MR's are merged, we can refactor this to query by
+    # multiple contents.
+    #
+    def todo_finder_params(args)
+      {
+        state: first_state(args),
+        type: first_type(args),
+        group_id: first_group_id(args),
+        author_id: first_author_id(args),
+        action_id: first_action(args),
+        project_id: first_project(args)
+      }
+    end
+
+    def first_project(args)
+      first_query_field(args, :project_id)
+    end
+
+    def first_action(args)
+      first_query_field(args, :action)
+    end
+
+    def first_author_id(args)
+      first_query_field(args, :author_id)
+    end
+
+    def first_group_id(args)
+      first_query_field(args, :group_id)
+    end
+
+    def first_state(args)
+      first_query_field(args, :state)
+    end
+
+    def first_type(args)
+      first_query_field(args, :type)
+    end
+
+    def first_query_field(query, field)
+      return unless query.key?(field)
+
+      query[field].first if query[field].respond_to?(:first)
+    end
+  end
+end
diff --git a/app/graphql/types/query_type.rb b/app/graphql/types/query_type.rb
index bbf94fb92df..996bf225976 100644
--- a/app/graphql/types/query_type.rb
+++ b/app/graphql/types/query_type.rb
@@ -14,6 +14,11 @@ module Types
           resolver: Resolvers::GroupResolver,
           description: "Find a group"
 
+    field :current_user, Types::UserType,
+          null: true,
+          resolve: -> (_obj, _args, context) { context[:current_user] },
+          description: "Get information about current user"
+
     field :namespace, Types::NamespaceType,
           null: true,
           resolver: Resolvers::NamespaceResolver,
diff --git a/app/graphql/types/todo_action_enum.rb b/app/graphql/types/todo_action_enum.rb
new file mode 100644
index 00000000000..0e538838474
--- /dev/null
+++ b/app/graphql/types/todo_action_enum.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module Types
+  class TodoActionEnum < BaseEnum
+    value 'assigned', value: 1
+    value 'mentioned', value: 2
+    value 'build_failed', value: 3
+    value 'marked', value: 4
+    value 'approval_required', value: 5
+    value 'unmergeable', value: 6
+    value 'directly_addressed', value: 7
+  end
+end
diff --git a/app/graphql/types/todo_state_enum.rb b/app/graphql/types/todo_state_enum.rb
new file mode 100644
index 00000000000..29a28b5208d
--- /dev/null
+++ b/app/graphql/types/todo_state_enum.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+module Types
+  class TodoStateEnum < BaseEnum
+    value 'pending'
+    value 'done'
+  end
+end
diff --git a/app/graphql/types/todo_target_enum.rb b/app/graphql/types/todo_target_enum.rb
new file mode 100644
index 00000000000..9a7391dcd99
--- /dev/null
+++ b/app/graphql/types/todo_target_enum.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module Types
+  class TodoTargetEnum < BaseEnum
+    value 'Issue'
+    value 'MergeRequest'
+    value 'Epic'
+  end
+end
diff --git a/app/graphql/types/todo_type.rb b/app/graphql/types/todo_type.rb
new file mode 100644
index 00000000000..d36daaf7dec
--- /dev/null
+++ b/app/graphql/types/todo_type.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+module Types
+  class TodoType < BaseObject
+    graphql_name 'Todo'
+    description 'Representing a todo entry'
+
+    present_using TodoPresenter
+
+    authorize :read_todo
+
+    field :id, GraphQL::ID_TYPE,
+          description: 'Id of the todo',
+          null: false
+
+    field :project, Types::ProjectType,
+          description: 'The project this todo is associated with',
+          null: true,
+          authorize: :read_project,
+          resolve: -> (todo, args, context) { Gitlab::Graphql::Loaders::BatchModelLoader.new(Project, todo.project_id).find }
+
+    field :group, Types::GroupType,
+          description: 'Group this todo is associated with',
+          null: true,
+          authorize: :read_group,
+          resolve: -> (todo, args, context) { Gitlab::Graphql::Loaders::BatchModelLoader.new(Group, todo.group_id).find }
+
+    field :author, Types::UserType,
+          description: 'The owner of this todo',
+          null: false,
+          resolve: -> (todo, args, context) { Gitlab::Graphql::Loaders::BatchModelLoader.new(User, todo.author_id).find }
+
+    field :action, Types::TodoActionEnum,
+          description: 'Action of the todo',
+          null: false
+
+    field :target_type, Types::TodoTargetEnum,
+          description: 'Target type of the todo',
+          null: false
+
+    field :body, GraphQL::STRING_TYPE,
+          description: 'Body of the todo',
+          null: false
+
+    field :state, Types::TodoStateEnum,
+          description: 'State of the todo',
+          null: false
+
+    field :created_at, Types::TimeType,
+          description: 'Timestamp this todo was created',
+          null: false
+  end
+end
diff --git a/app/graphql/types/user_type.rb b/app/graphql/types/user_type.rb
index 9f7d2a171d6..1ba37927b40 100644
--- a/app/graphql/types/user_type.rb
+++ b/app/graphql/types/user_type.rb
@@ -12,5 +12,8 @@ module Types
     field :username, GraphQL::STRING_TYPE, null: false # rubocop:disable Graphql/Descriptions
     field :avatar_url, GraphQL::STRING_TYPE, null: false # rubocop:disable Graphql/Descriptions
     field :web_url, GraphQL::STRING_TYPE, null: false # rubocop:disable Graphql/Descriptions
+    field :todos, Types::TodoType.connection_type, null: false,
+          resolver: Resolvers::TodoResolver,
+          description: 'Todos of this user'
   end
 end