Merge branch 'bvl-graphql-start-34754' into 'master'

GraphQL setup: Basic Project and Merge request endpoint

Closes #34754

See merge request gitlab-org/gitlab-ce!19008

1 files changed, 45 insertions, 0 deletions

diff --git a/app/controllers/graphql_controller.rb b/app/controllers/graphql_controller.rb
new file mode 100644
index 00000000000..0a1cf169aca
--- /dev/null
+++ b/app/controllers/graphql_controller.rb
@@ -0,0 +1,45 @@
+class GraphqlController < ApplicationController
+  # Unauthenticated users have access to the API for public data
+  skip_before_action :authenticate_user!
+
+  before_action :check_graphql_feature_flag!
+
+  def execute
+    variables = Gitlab::Graphql::Variables.new(params[:variables]).to_h
+    query = params[:query]
+    operation_name = params[:operationName]
+    context = {
+      current_user: current_user
+    }
+    result = GitlabSchema.execute(query, variables: variables, context: context, operation_name: operation_name)
+    render json: result
+  end
+
+  rescue_from StandardError do |exception|
+    log_exception(exception)
+
+    render_error("Internal server error")
+  end
+
+  rescue_from Gitlab::Graphql::Variables::Invalid do |exception|
+    render_error(exception.message, status: :unprocessable_entity)
+  end
+
+  private
+
+  # Overridden from the ApplicationController to make the response look like
+  # a GraphQL response. That is nicely picked up in Graphiql.
+  def render_404
+    render_error("Not found!", status: :not_found)
+  end
+
+  def render_error(message, status: 500)
+    error = { errors: [message: message] }
+
+    render json: error, status: status
+  end
+
+  def check_graphql_feature_flag!
+    render_404 unless Feature.enabled?(:graphql)
+  end
+end