The OER Direct Print module complements the label engine by optimizing user workflows. It eliminates the traditional requirement of downloading PDFs and launching separate Adobe or preview programs. Instead, it renders the label layout directly, persists it momentarily in storage, and opens a lightweight web page that triggers the browser's system print dialog automatically.

Requirements:

1. Make sure product_label_oer is active.
2. Put the product_label_print_oer module folder inside your addons directory.
3. Search for OER Direct Print in Apps and click Activate.

Configure user-level settings in Odoo to support immediate printing:

• Immediate Printing: When this field is active on a user record, launching print actions bypasses settings views and routes directly to the instant viewer.

• Instant Print Triggers: Automatically displays browser-native print layout.
• Short-lived Attachments: Creates temporary attachments to render previews safely.
• Auto-Vacuum Cleanup: Programmatic cron automatically deletes printed label files older than 24 hours to prevent storage inflation.
• Dual Viewport: Incorporates full-screen preview alongside a hidden iframe trigger script.

1. Select products on active views and trigger the OER print wizard.
2. If immediate printing is configured: the browser opens a new tab, displays the PDF, and immediately pops up the system print dialog.
3. If immediate printing is disabled: clicking print inside the wizard will generate the PDF and display the viewer tab immediately.

The backend router serves files at:

/oer_label_viewer/<attachment_id>

The route renders product_label_print_oer.instant_print_viewer_page template, which encapsulates the target PDF binary and initiates printing through custom JavaScript trigger functions.

The viewer route enforces standard Odoo session verification (auth="user"). It validates that the requested document matches the exact name signature OER Instant Label Output and mimetype before serving it.