Data exports (#2517)

* Import / export UI

* Data exports

* Lint fixes, brakeman update

app/controllers/family_exports_controller.rb

@@ -0,0 +1,47 @@
+class FamilyExportsController < ApplicationController
+  include StreamExtensions
+
+  before_action :require_admin
+  before_action :set_export, only: [ :download ]
+
+  def new
+    # Modal view for initiating export
+  end
+
+  def create
+    @export = Current.family.family_exports.create!
+    FamilyDataExportJob.perform_later(@export)
+
+    respond_to do |format|
+      format.html { redirect_to settings_profile_path, notice: "Export started. You'll be able to download it shortly." }
+      format.turbo_stream {
+        stream_redirect_to settings_profile_path, notice: "Export started. You'll be able to download it shortly."
+      }
+    end
+  end
+
+  def index
+    @exports = Current.family.family_exports.ordered.limit(10)
+    render layout: false # For turbo frame
+  end
+
+  def download
+    if @export.downloadable?
+      redirect_to @export.export_file, allow_other_host: true
+    else
+      redirect_to settings_profile_path, alert: "Export not ready for download"
+    end
+  end
+
+  private
+
+    def set_export
+      @export = Current.family.family_exports.find(params[:id])
+    end
+
+    def require_admin
+      unless Current.user.admin?
+        redirect_to root_path, alert: "Access denied"
+      end
+    end
+end