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<?php
/**
* Define the WPRSS OPML Importer to set up the Import OPML Page
* and parse uploaded OPML files and import them into WPRSS'
* custom post types.
*
* @since 3.3
* @package WPRSSAggregator
*/
/*
* Check if the WP_Importer Class is already loaded.
* If not, load it.
*/
if ( !class_exists( 'WP_Importer' ) ) {
$class_wp_importer = ABSPATH . 'wp-admin/includes/class-wp-importer.php';
if ( file_exists( $class_wp_importer ) )
require $class_wp_importer;
}
/**
* WPRSS_OPML_Importer Class handles the OPML Import Page and
* OPML file upload. It also constructs a WPRSS_OPML object
* for the uploaded file, which parses the file, and then
* imports it into WPRSS' custom post types.
*
* @since 3.3
*/
class WPRSS_OPML_Importer extends WP_Importer {
/**
* The static Singleton Instance of the importer
*/
public static $singleton;
/**
* The ID of the uploaded file to import
*/
private $id;
/**
* Constructor: Prepares the Importer
*/
public function __contruct() {
parent::__contruct();
}
/**
* Shows The Import Page and import form for step 1.
* Calls the parsing and importing function for step 2.
*
* @since 3.3
* @return void
*/
public function opml_import() {
echo '<div class="wrap">';
printf('<h2 class="wrap">%s</h2>', __('Import OPML', 'wprss'));
// Get the current step from URL query string
$step = filter_input(INPUT_GET, 'step', FILTER_VALIDATE_INT);
$step = empty($step) ? 0 : $step;
// Check the current step
switch ( $step ) {
default :
case 0 :
// Show the Import Message and the import upload form
printf('<p>%s</p>', __('Howdy! Import your feeds here from an OPML (.xml) export file.', 'wprss'));
printf('<p>%s</p>', __('Click the button below, choose your file, and click \'Upload\'.', 'wprss'));
printf('<p>%s</p>', __('We will take care of the rest.', 'wprss'));
// Show an import upload form that submits to the same page, with GET parameter step=1
wp_import_upload_form( 'admin.php?import=wprss_opml_importer&step=1' );
break;
case 1:
// Check referer
check_admin_referer( 'import-upload' );
// If the handle_upload function returns true
if ( $this->handle_upload() ) {
// Get the uploaded file
$file = get_attached_file( $this->id );
set_time_limit(0);
// Parse the File and Import the feeds
$this->parse_and_import( $file );
}
break;
}
echo '</div>';
}
private function handle_upload() {
// Get the upload file
$file = wp_import_handle_upload();
// If the 'error' property is set, show the error message and return FALSE
if (isset($file['error'])) {
printf(
'<p><strong>%s</strong><br/>%s</p>',
__('Sorry, an error has been encountered.', 'wprss'),
esc_html($file['error'])
);
return false;
// If the file does not exist, then show the error message and return FALSE
} elseif (!file_exists($file['file'])) {
printf(
'<p><strong>%s</strong><br/>%s</p>',
__('Sorry, it seems your uploaded file has been misplaced!', 'wprss'),
sprintf(
__('The uploaded file could not be found at %s. It is likely that this was caused by a permissions problem.', 'wprss'),
'<code>' . esc_html($file['file']) . '</code>'
)
);
return false;
}
$this->id = (int) $file['id'];
return true;
}
/**
* Imports the give <outline> OPML element as a wprss_feed
*
* @since 3.3
* @param $outline The outline OPML element
*/
private function import_opml_feed( $outline ) {
// IF the necassary fields are not present in the element
if ( !isset( $outline['title'] ) && !isset( $outline['xmlUrl'] ) ) {
// Check if the element is an array
if ( is_array( $outline ) ) {
// Treat it as an array of sub <outline> elements
$inserted_ids = array();
// Insert all sub outline elements
foreach ( $outline as $key => $sub_outline ) {
$inserted_ids[] = $this->import_opml_feed( $sub_outline );
}
// Return the inserted IDs
return $inserted_ids;
}
// IF not an array, return NULL
else return NULL;
}
// Create an associative array, with the feed's properties
$feed = apply_filters(
'wprss_opml_insert_feed',
array(
'post_title' => $outline['title'],
'post_content' => '',
'post_status' => 'publish',
'post_type' => 'wprss_feed'
)
);
// Insert the post into the database and store the inserted ID
$inserted_id = wp_insert_post( $feed );
// Update the post's meta
update_post_meta( $inserted_id, 'wprss_url', $outline['xmlUrl'] );
// Trigger an action, to allow modifications to the inserted feed, based on the outline element
do_action( 'wprss_opml_inserted_feed', $inserted_id, $outline );
// Return inserted ID
return $inserted_id;
}
/**
* Attempts to parse the given file as an OPML construct, and
* import each found feed.
*
* @since 3.3
* @param file The OPML file to parse and import
* @return void
* @todo Use the parsed $opml object to import the feeds AND remove var_dump
*/
private function parse_and_import( $file ) {
try {
$opml = new WPRSS_OPML( $file );
// Show Success Message
?><h3><?php _e( 'Feeds were imported successfully!', 'wprss' ) ?></h3><?php
// Show imported feeds
?>
<table class="widefat">
<thead>
<tr>
<th><?php _e( 'ID', 'wprss' ) ?></th>
<th><?php _e( 'Title', 'wprss' ) ?></th>
<th><?php _e( 'URL', 'wprss' ) ?></th>
</tr>
</thead>
<tbody>
<?php
foreach ( $opml->body as $opml_feed ) :
$inserted_ids = $this->import_opml_feed( $opml_feed );
if ( !is_array( $inserted_ids ) ) {
$inserted_ids = array( $inserted_ids );
}
foreach ( $inserted_ids as $inserted_id ) :
if ( $inserted_id !== NULL ) :
$imported_feed = get_post( $inserted_id, 'ARRAY_A' );
?>
<tr>
<td><?php echo $inserted_id; ?></td>
<td><?php echo $imported_feed['post_title']; ?> </td>
<td><?php echo get_post_meta( $inserted_id, 'wprss_url', TRUE ); ?></td>
</tr>
<?php endif; ?>
<?php endforeach; ?>
<?php endforeach; ?>
</tbody>
<tfoot>
<tr>
<th><?php _e( 'ID', 'wprss' ) ?></th>
<th><?php _e( 'Title', 'wprss' ) ?></th>
<th><?php _e( 'URL', 'wprss' ) ?></th>
</tr>
</tfoot>
</table>
<?php
} catch (Exception $e) {
// Show Error Message
?><div class="error"><?php echo wpautop( __( $e->getMessage(), 'wprss' ) ) ?></div><?php
}
}
}
/* Initialize the Singleton Instance of the Importer */
WPRSS_OPML_Importer::$singleton = new WPRSS_OPML_Importer();
add_action( 'admin_init', 'wprss_opml_register_import' );
/**
* Initializes and registers the OPML Importer
* @since 3.3
*/
function wprss_opml_register_import() {
register_importer(
'wprss_opml_importer',
__( 'WP RSS OPML', 'wprss' ),
__( 'Import Feeds from an OPML file into WP RSS Aggregator', 'wprss' ),
array( WPRSS_OPML_Importer::$singleton ,'opml_import' )
);
}