Support collected invoice economic PDF downloads

services/nginx/app/modules/economic/endpoints/invoices/economic_invoices_pdf_endpoint.php

@@ -9,21 +9,49 @@ class economic_invoices_pdf_endpoint
     use economic_endpoint_t;
 
     /**
-     * Get a PDF of a booked invoice
+     * Get a PDF of a booked invoice.
+     *
+     * Kept as the legacy alias used by existing invoice download flows.
      * @param int $id
      * @return string
      */
     public function get(int $id): string
+    {
+        return $this->getBooked($id);
+    }
+
+    /**
+     * Get a PDF of a booked invoice.
+     * @param int $id
+     * @return string
+     */
+    public function getBooked(int $id): string
+    {
+        return $this->downloadPdf('/invoices/booked/' . $id . '/pdf', 'booked_invoice_');
+    }
+
+    /**
+     * Get a PDF of a draft invoice.
+     * @param int $id
+     * @return string
+     */
+    public function getDraft(int $id): string
+    {
+        return $this->downloadPdf('/invoices/drafts/' . $id . '/pdf', 'draft_invoice_');
+    }
+
+    private function downloadPdf(string $path, string $prefix): string
     {
         $unique_id = uniqid();
+        $file_path = '/tmp/' . $prefix . $unique_id . '.pdf';
         $this->send_file_download_request(
-            '/invoices/booked/' . $id . '/pdf',
+            $path,
             'GET',
             '',
             false,
-            '/tmp/invoice_' . $unique_id . '.pdf'
+            $file_path
         );
-        return '/tmp/invoice_' . $unique_id . '.pdf';
+        return $file_path;
     }
 
-}
+}