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/**

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* Displays the atom enclosure for the current post.

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* Uses the global $post to check whether the post requires a password and if

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* the user has the password for the post. If not then it will return before

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* displaying.

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* Also uses the function get_post_custom() to get the post's 'enclosure'

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* metadata field and parses the value to display the enclosure(s). The

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* enclosure(s) consist of link HTML tag(s) with a URI and other attributes.

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* @since 2.2.0

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function atom_enclosure() {

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if ( post_password_required() ) {

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return;

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}

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foreach ( (array) get_post_custom() as $key => $val ) {

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if ( 'enclosure' === $key ) {

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foreach ( (array) $val as $enc ) {

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$enclosure = explode( "\n", $enc );

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$url = '';

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$type = '';

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$length = 0;

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$mimes = get_allowed_mime_types();

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// Parse URL.

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if ( isset( $enclosure[0] ) && is_string( $enclosure[0] ) ) {

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$url = trim( $enclosure[0] );

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}

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// Parse length and type.

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for ( $i = 1; $i <= 2; $i++ ) {

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if ( isset( $enclosure[ $i ] ) ) {

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if ( is_numeric( $enclosure[ $i ] ) ) {

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$length = trim( $enclosure[ $i ] );

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} elseif ( in_array( $enclosure[ $i ], $mimes, true ) ) {

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$type = trim( $enclosure[ $i ] );

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}

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}

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}

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$html_link_tag = sprintf(

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"<link href=\"%s\" rel=\"enclosure\" length=\"%d\" type=\"%s\" />\n",

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esc_url( $url ),

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esc_attr( $length ),

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esc_attr( $type )

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);

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/**

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* Filters the atom enclosure HTML link tag for the current post.

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* @since 2.2.0

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* @param string $html_link_tag The HTML link tag with a URI and other attributes.

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echo apply_filters( 'atom_enclosure', $html_link_tag );

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}

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}

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}

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}

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/**

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* Determines the type of a string of data with the data formatted.

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* Tell whether the type is text, HTML, or XHTML, per RFC 4287 section 3.1.

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* In the case of WordPress, text is defined as containing no markup,

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* XHTML is defined as "well formed", and HTML as tag soup (i.e., the rest).

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* Container div tags are added to XHTML values, per section 3.1.1.3.

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* @link http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.3.1

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* @since 2.5.0

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* @param string $data Input string.

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* @return array array(type, value)

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function prep_atom_text_construct( $data ) {

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if ( ! str_contains( $data, '<' ) && ! str_contains( $data, '&' ) ) {

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return array( 'text', $data );

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}

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if ( ! function_exists( 'xml_parser_create' ) ) {

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wp_trigger_error( '', __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) );

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return array( 'html', "<![CDATA[$data]]>" );

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}

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$parser = xml_parser_create();

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xml_parse( $parser, '<div>' . $data . '</div>', true );

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$code = xml_get_error_code( $parser );

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xml_parser_free( $parser );

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unset( $parser );

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if ( ! $code ) {

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if ( ! str_contains( $data, '<' ) ) {

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return array( 'text', $data );

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} else {

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$data = "<div xmlns='http://www.w3.org/1999/xhtml'>$data</div>";

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return array( 'xhtml', $data );

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}

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}

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if ( ! str_contains( $data, ']]>' ) ) {

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return array( 'html', "<![CDATA[$data]]>" );

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} else {

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return array( 'html', htmlspecialchars( $data ) );

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}

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}

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/**

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* Displays Site Icon in atom feeds.

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* @since 4.3.0

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* @see get_site_icon_url()

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function atom_site_icon() {

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$url = get_site_icon_url( 32 );

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if ( $url ) {

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echo '<icon>' . convert_chars( $url ) . "</icon>\n";

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}

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}

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/**

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* Displays Site Icon in RSS2.

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* @since 4.3.0

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function rss2_site_icon() {

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$rss_title = get_wp_title_rss();

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if ( empty( $rss_title ) ) {

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$rss_title = get_bloginfo_rss( 'name' );

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}

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$url = get_site_icon_url( 32 );

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if ( $url ) {

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echo '

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<image>

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<url>' . convert_chars( $url ) . '</url>

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<title>' . $rss_title . '</title>

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</image> ' . "\n";

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}

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}

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/**

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* Returns the link for the currently displayed feed.

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* @since 5.3.0

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* @return string Correct link for the atom:self element.

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function get_self_link() {

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$parsed = parse_url( home_url() );

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$domain = $parsed['host'];

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if ( isset( $parsed['port'] ) ) {

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$domain .= ':' . $parsed['port'];

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}

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return set_url_scheme( 'http://' . $domain . wp_unslash( $_SERVER['REQUEST_URI'] ) );

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}

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/**

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* Displays the link for the currently displayed feed in a XSS safe way.

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* Generate a correct link for the atom:self element.

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* @since 2.5.0

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function self_link() {

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/**

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* Filters the current feed URL.

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* @since 3.6.0

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* @see set_url_scheme()

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* @see wp_unslash()

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* @param string $feed_link The link for the feed with set URL scheme.

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echo esc_url( apply_filters( 'self_link', get_self_link() ) );

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}

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/**

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* Gets the UTC time of the most recently modified post from WP_Query.

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* If viewing a comment feed, the time of the most recently modified

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* comment will be returned.

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* @since 5.2.0

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* @global WP_Query $wp_query WordPress Query object.

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* @param string $format Date format string to return the time in.

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* @return string|false The time in requested format, or false on failure.

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function get_feed_build_date( $format ) {

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global $wp_query;

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$datetime = false;

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$max_modified_time = false;

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$utc = new DateTimeZone( 'UTC' );

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if ( ! empty( $wp_query ) && $wp_query->have_posts() ) {

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// Extract the post modified times from the posts.

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$modified_times = wp_list_pluck( $wp_query->posts, 'post_modified_gmt' );

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// If this is a comment feed, check those objects too.

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if ( $wp_query->is_comment_feed() && $wp_query->comment_count ) {

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// Extract the comment modified times from the comments.

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$comment_times = wp_list_pluck( $wp_query->comments, 'comment_date_gmt' );

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// Add the comment times to the post times for comparison.

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$modified_times = array_merge( $modified_times, $comment_times );

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}

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// Determine the maximum modified time.

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$datetime = date_create_immutable_from_format( 'Y-m-d H:i:s', max( $modified_times ), $utc );

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}

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if ( false === $datetime ) {

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// Fall back to last time any post was modified or published.

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$datetime = date_create_immutable_from_format( 'Y-m-d H:i:s', get_lastpostmodified( 'GMT' ), $utc );

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}

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if ( false !== $datetime ) {

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$max_modified_time = $datetime->format( $format );

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}

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/**

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* Filters the date the last post or comment in the query was modified.

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* @since 5.2.0

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* @param string|false $max_modified_time Date the last post or comment was modified in the query, in UTC.

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* False on failure.

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* @param string $format The date format requested in get_feed_build_date().

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return apply_filters( 'get_feed_build_date', $max_modified_time, $format );

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}

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/**

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* Returns the content type for specified feed type.

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* @since 2.8.0

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* @param string $type Type of feed. Possible values include 'rss', rss2', 'atom', and 'rdf'.

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* @return string Content type for specified feed type.

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function feed_content_type( $type = '' ) {

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if ( empty( $type ) ) {

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$type = get_default_feed();

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}

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$types = array(

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'rss' => 'application/rss+xml',

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'rss2' => 'application/rss+xml',

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'rss-http' => 'text/xml',

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'atom' => 'application/atom+xml',

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'rdf' => 'application/rdf+xml',

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);

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$content_type = ( ! empty( $types[ $type ] ) ) ? $types[ $type ] : 'application/octet-stream';

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/**

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* Filters the content type for a specific feed type.

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* @since 2.8.0

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* @param string $content_type Content type indicating the type of data that a feed contains.

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* @param string $type Type of feed. Possible values include 'rss', rss2', 'atom', and 'rdf'.

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return apply_filters( 'feed_content_type', $content_type, $type );

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}

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/**

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* Builds SimplePie object based on RSS or Atom feed from URL.

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* @since 2.8.0

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* @param string|string[] $url URL of feed to retrieve. If an array of URLs, the feeds are merged

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* using SimplePie's multifeed feature.

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* See also {@link http://simplepie.org/wiki/faq/typical_multifeed_gotchas}

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* @return SimplePie|WP_Error SimplePie object on success or WP_Error object on failure.

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function fetch_feed( $url ) {

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if ( ! class_exists( 'SimplePie', false ) ) {

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require_once ABSPATH . WPINC . '/class-simplepie.php';

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}

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require_once ABSPATH . WPINC . '/class-wp-feed-cache-transient.php';

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require_once ABSPATH . WPINC . '/class-wp-simplepie-file.php';

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require_once ABSPATH . WPINC . '/class-wp-simplepie-sanitize-kses.php';

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$feed = new SimplePie();

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$feed->set_sanitize_class( 'WP_SimplePie_Sanitize_KSES' );

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* We must manually overwrite $feed->sanitize because SimplePie's constructor

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* sets it before we have a chance to set the sanitization class.

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$feed->sanitize = new WP_SimplePie_Sanitize_KSES();

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// Register the cache handler using the recommended method for SimplePie 1.3 or later.

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if ( method_exists( 'SimplePie_Cache', 'register' ) ) {

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SimplePie_Cache::register( 'wp_transient', 'WP_Feed_Cache_Transient' );

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$feed->set_cache_location( 'wp_transient' );

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} else {

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// Back-compat for SimplePie 1.2.x.

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require_once ABSPATH . WPINC . '/class-wp-feed-cache.php';

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$feed->set_cache_class( 'WP_Feed_Cache' );

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}

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$feed->set_file_class( 'WP_SimplePie_File' );

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$feed->set_feed_url( $url );

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/** This filter is documented in wp-includes/class-wp-feed-cache-transient.php */

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$feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) );

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/**

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* Fires just before processing the SimplePie feed object.

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* @since 3.0.0

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* @param SimplePie $feed SimplePie feed object (passed by reference).

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* @param string|string[] $url URL of feed or array of URLs of feeds to retrieve.

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do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) );

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$feed->init();

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$feed->set_output_encoding( get_option( 'blog_charset' ) );

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if ( $feed->error() ) {

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return new WP_Error( 'simplepie-error', $feed->error() );

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}

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return $feed;

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}

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