1 files changed, 60 insertions, 0 deletions
diff --git a/app/graphql/resolvers/ci/config_resolver.rb b/app/graphql/resolvers/ci/config_resolver.rb
new file mode 100644
index 00000000000..d6e7c206691
--- /dev/null
+++ b/app/graphql/resolvers/ci/config_resolver.rb
@@ -0,0 +1,60 @@
+# frozen_string_literal: true
+
+module Resolvers
+  module Ci
+    class ConfigResolver < BaseResolver
+      type Types::Ci::Config::ConfigType, null: true
+
+      argument :content, GraphQL::STRING_TYPE,
+               required: true,
+               description: 'Contents of .gitlab-ci.yml'
+
+      def resolve(content:)
+        result = ::Gitlab::Ci::YamlProcessor.new(content).execute
+
+        response = if result.errors.empty?
+                     {
+                       status: :valid,
+                       errors: [],
+                       stages: make_stages(result.jobs)
+                     }
+                   else
+                     {
+                       status: :invalid,
+                       errors: result.errors
+                     }
+                   end
+
+        response.merge(merged_yaml: result.merged_yaml)
+      end
+
+      private
+
+      def make_jobs(config_jobs)
+        config_jobs.map do |job_name, job|
+          {
+            name: job_name,
+            stage: job[:stage],
+            group_name: CommitStatus.new(name: job_name).group_name,
+            needs: job.dig(:needs, :job) || []
+          }
+        end
+      end
+
+      def make_groups(job_data)
+        jobs = make_jobs(job_data)
+
+        jobs_by_group = jobs.group_by { |job| job[:group_name] }
+        jobs_by_group.map do |name, jobs|
+          { jobs: jobs, name: name, stage: jobs.first[:stage], size: jobs.size }
+        end
+      end
+
+      def make_stages(jobs)
+        make_groups(jobs)
+          .group_by { |group| group[:stage] }
+          .map { |name, groups| { name: name, groups: groups } }
+      end
+    end
+  end
+end