#434

backend/app/controllers/counts_exports_controller.rb

@@ -0,0 +1,20 @@
+class CountsExportsController < ApplicationController
+  wrap_parameters false
+
+  def index
+    locale = resolve_locale!
+    exporter = CountsExporter.new(request.request_parameters.merge(request.query_parameters),
+                                  language_code: locale.language_code)
+    response.headers['Content-Type'] = exporter.format == 'json' ?
+        'application/json; charset=utf-8' : 'text/csv; charset=utf-8'
+    response.headers['Content-Disposition'] =
+        "attachment; filename=\"counts-#{ exporter.resource }.#{ exporter.format }\""
+    response.headers['Cache-Control'] = 'private, no-store'
+    response.headers['X-Accel-Buffering'] = 'no'
+    # Rack::ETag otherwise materialises the response to calculate a digest.
+    response.headers['Last-Modified'] = Time.current.httpdate
+    self.response_body = exporter.body
+  rescue ArgumentError, TypeError, JSON::ParserError
+    head :bad_request
+  end
+end