Load More button returns “Invalid template” on Linux servers

Description:

The Load More button on the Post Grid widget returns {"success":false,"data":"Invalid template"} on Linux servers due to two bugs in Ajax_Handler.php:

Bug 1 — Missing dir segment in template path

In ajax_load_more(), the file path is built as:

Template/{name}/{file_name}

But template_info contains a dir value (lite, pro, or theme) that is never included in the path. It should be:

Template/{name}/{dir}/{file_name}

Bug 2 — Case mismatch from sanitize_file_name

eael_sanitize_template_param() runs sanitize_file_name() on template_info, which lowercases the name value from Post-Grid to post-grid. On Linux, realpath() then fails because the actual folder is named Post-Grid (capital P, capital G). Either the folder should be lowercase, or sanitize_file_name should not be applied to the name key.

Fix:

In ajax_load_more(), change the path sprintf from:

php

'%s/Template/%s/%s'
$dir_path, $template_info['name'], $template_info['file_name']

To:

php

'%s/Template/%s/%s/%s'
$dir_path, $template_info['name'], $template_info['dir'], $template_info['file_name']

And either rename the Post-Grid folder to post-grid, or exclude the name key from sanitize_file_name in eael_sanitize_template_param().