1 files changed, 55 insertions, 0 deletions
diff --git a/app/graphql/resolvers/milestones_resolver.rb b/app/graphql/resolvers/milestones_resolver.rb
new file mode 100644
index 00000000000..5f80506c01b
--- /dev/null
+++ b/app/graphql/resolvers/milestones_resolver.rb
@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+module Resolvers
+  class MilestonesResolver < BaseResolver
+    include Gitlab::Graphql::Authorize::AuthorizeResource
+    include TimeFrameArguments
+
+    argument :ids, [GraphQL::ID_TYPE],
+             required: false,
+             description: 'Array of global milestone IDs, e.g., "gid://gitlab/Milestone/1"'
+
+    argument :state, Types::MilestoneStateEnum,
+             required: false,
+             description: 'Filter milestones by state'
+
+    type Types::MilestoneType, null: true
+
+    def resolve(**args)
+      validate_timeframe_params!(args)
+
+      authorize!
+
+      MilestonesFinder.new(milestones_finder_params(args)).execute
+    end
+
+    private
+
+    def milestones_finder_params(args)
+      {
+        ids: parse_gids(args[:ids]),
+        state: args[:state] || 'all',
+        start_date: args[:start_date],
+        end_date: args[:end_date]
+      }.merge(parent_id_parameters(args))
+    end
+
+    def parent
+      synchronized_object
+    end
+
+    def parent_id_parameters(args)
+      raise NotImplementedError
+    end
+
+    # MilestonesFinder does not check for current_user permissions,
+    # so for now we need to keep it here.
+    def authorize!
+      Ability.allowed?(context[:current_user], :read_milestone, parent) || raise_resource_not_available_error!
+    end
+
+    def parse_gids(gids)
+      gids&.map { |gid| GitlabSchema.parse_gid(gid, expected_type: Milestone).model_id }
+    end
+  end
+end