Basic FASP support (#34031)

app/controllers/api/fasp/registrations_controller.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class Api::Fasp::RegistrationsController < Api::Fasp::BaseController
+  skip_before_action :require_authentication
+
+  def create
+    @current_provider = Fasp::Provider.create!(
+      name: params[:name],
+      base_url: params[:baseUrl],
+      remote_identifier: params[:serverId],
+      provider_public_key_base64: params[:publicKey]
+    )
+
+    render json: registration_confirmation
+  end
+
+  private
+
+  def registration_confirmation
+    {
+      faspId: current_provider.id.to_s,
+      publicKey: current_provider.server_public_key_base64,
+      registrationCompletionUri: new_admin_fasp_provider_registration_url(current_provider),
+    }
+  end
+end