[Bug] attachment_url_to_postid is not handled correctly

The URL used to search is the BLOB url, which is contained within _wp_attachment_metadata’ instead of ‘_wp_attached_file’.

I’m not sure if there is a better way around this, but this filter searches _wp_attachment_metadata instead. Perhaps ‘windows_azure_storage_info’ would be more appropriate?

add_filter('attachment_url_to_postid','azure_fix_attachment_url_to_image',99,2);

function azure_fix_attachment_url_to_image( $post_id, $url ) {
	global $wpdb;

    $dir = wp_upload_dir();
    $path = $url;

    $site_url = parse_url( $dir['url'] );
    $image_path = parse_url( $path );

    //force the protocols to match if needed
    if ( isset( $image_path['scheme'] ) && ( $image_path['scheme'] !== $site_url['scheme'] ) ) {
        $path = str_replace( $image_path['scheme'], $site_url['scheme'], $path );
    }

    if ( 0 === strpos( $path, $dir['baseurl'] . '/' ) ) {
        $path = substr( $path, strlen( $dir['baseurl'] . '/' ) );
    }

    $sql = $wpdb->prepare(
        "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE '%%%s%%'",
        $path
    );
    $post_id = $wpdb->get_var( $sql );

	return (int) $post_id;
}

https://wordpress.org/plugins/windows-azure-storage/