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<?php
namespace B2\Modules\Common;
class UrlDetails
{
public function parse_url_details($url)
{
$url = untrailingslashit($url);
if (empty($url)) {
return [];
}
$remote_url_response = $this->get_remote_url($url);
$html_head = $this->get_document_head($remote_url_response);
$meta_elements = $this->get_meta_with_content_elements($html_head);
$data = array(
'title' => $this->get_title($html_head),
'icon' => $this->get_icon($html_head, $url),
'description' => $this->get_description($meta_elements),
'image' => $this->get_image($meta_elements, $url),
);
// Wrap the data in a response object.
$response = rest_ensure_response($data);
return $response;
}
public function get_image($meta_elements, $url)
{
$image = $this->get_metadata_from_meta_element(
$meta_elements,
'property',
'(?:og:image|og:image:url)'
);
// Bail out if image not found.
if ('' === $image) {
return '';
}
// Attempt to convert relative URLs to absolute.
$parsed_url = parse_url($url);
if (isset($parsed_url['scheme']) && isset($parsed_url['host'])) {
$root_url = $parsed_url['scheme'] . '://' . $parsed_url['host'] . '/';
$image = \WP_Http::make_absolute_url($image, $root_url);
}
return $image;
}
public function get_metadata_from_meta_element($meta_elements, $attr, $attr_value)
{
// Bail out if there are no meta elements.
if (empty($meta_elements[0])) {
return '';
}
$metadata = '';
$pattern = '#' .
/*
* Target this attribute and value to find the metadata element.
*
* Allows for (a) no, single, double quotes and (b) whitespace in the value.
*
* Why capture the opening quotation mark, i.e. (["\']), and then backreference,
* i.e \1, for the closing quotation mark?
* To ensure the closing quotation mark matches the opening one. Why? Attribute values
* can contain quotation marks, such as an apostrophe in the content.
*/
$attr . '=([\"\']??)\s*' . $attr_value . '\s*\1' .
/*
* These are the options:
* - i : case insensitive
* - s : allows newline characters for the . match (needed for multiline elements)
* - U means non-greedy matching
*/
'#isU';
// Find the metadata element.
foreach ($meta_elements[0] as $index => $element) {
preg_match($pattern, $element, $match);
// This is not the metadata element. Skip it.
if (empty($match)) {
continue;
}
/*
* Found the metadata element.
* Get the metadata from its matching content array.
*/
if (isset($meta_elements[2][$index]) && is_string($meta_elements[2][$index])) {
$metadata = trim($meta_elements[2][$index]);
}
break;
}
return $metadata;
}
public function get_description($meta_elements)
{
// Bail out if there are no meta elements.
if (empty($meta_elements[0])) {
return '';
}
$description = $this->get_metadata_from_meta_element(
$meta_elements,
'name',
'(?:description|og:description)'
);
// Bail out if description not found.
if ('' === $description) {
return '';
}
return $this->prepare_metadata_for_output($description);
}
public function prepare_metadata_for_output($metadata)
{
$metadata = html_entity_decode($metadata, ENT_QUOTES, get_bloginfo('charset'));
$metadata = wp_strip_all_tags($metadata);
return $metadata;
}
public function get_icon($html, $url)
{
// Grab the icon's link element.
$pattern = '#<link\s[^>]*rel=(?:[\"\']??)\s*(?:icon|shortcut icon|icon shortcut)\s*(?:[\"\']??)[^>]*\/?>#isU';
preg_match($pattern, $html, $element);
if (empty($element[0]) || !is_string($element[0])) {
return '';
}
$element = trim($element[0]);
// Get the icon's href value.
$pattern = '#href=([\"\']??)([^\" >]*?)\\1[^>]*#isU';
preg_match($pattern, $element, $icon);
if (empty($icon[2]) || !is_string($icon[2])) {
return '';
}
$icon = trim($icon[2]);
// If the icon is a data URL, return it.
$parsed_icon = parse_url($icon);
if (isset($parsed_icon['scheme']) && 'data' === $parsed_icon['scheme']) {
return $icon;
}
// Attempt to convert relative URLs to absolute.
if (!is_string($url) || '' === $url) {
return $icon;
}
$parsed_url = parse_url($url);
if (isset($parsed_url['scheme']) && isset($parsed_url['host'])) {
$root_url = $parsed_url['scheme'] . '://' . $parsed_url['host'] . '/';
$icon = \WP_Http::make_absolute_url($icon, $root_url);
}
return $icon;
}
public function get_title($html)
{
$pattern = '#<title[^>]*>(.*?)<\s*/\s*title>#is';
preg_match($pattern, $html, $match_title);
if (empty($match_title[1]) || !is_string($match_title[1])) {
return '';
}
$title = trim($match_title[1]);
return $this->prepare_metadata_for_output($title);
}
public function get_remote_url($url)
{
$modified_user_agent = 'WP-URLDetails/' . get_bloginfo('version') . ' (+' . get_bloginfo('url') . ')';
$args = array(
'limit_response_size' => 150 * KB_IN_BYTES,
'user-agent' => $modified_user_agent,
);
$args = apply_filters('rest_url_details_http_request_args', $args, $url);
$response = wp_safe_remote_get($url, $args);
if (\WP_Http::OK !== wp_remote_retrieve_response_code($response)) {
// Not saving the error response to cache since the error might be temporary.
return new \WP_Error(
'no_response',
__('URL not found. Response returned a non-200 status code for this URL.'),
array('status' => \WP_Http::NOT_FOUND)
);
}
$remote_body = wp_remote_retrieve_body($response);
if (empty($remote_body)) {
return new \WP_Error(
'no_content',
__('Unable to retrieve body from response at this URL.'),
array('status' => \WP_Http::NOT_FOUND)
);
}
return $remote_body;
}
public function get_document_head($html)
{
$head_html = $html;
// Find the opening `<head>` tag.
$head_start = strpos($html, '<head');
if (false === $head_start) {
// Didn't find it. Return the original HTML.
return $html;
}
// Find the closing `</head>` tag.
$head_end = strpos($head_html, '</head>');
if (false === $head_end) {
// Didn't find it. Find the opening `<body>` tag.
$head_end = strpos($head_html, '<body');
// Didn't find it. Return the original HTML.
if (false === $head_end) {
return $html;
}
}
// Extract the HTML from opening tag to the closing tag. Then add the closing tag.
$head_html = substr($head_html, $head_start, $head_end);
$head_html .= '</head>';
return $head_html;
}
public function get_meta_with_content_elements($html)
{
$pattern = '#<meta\s' .
/*
* Allows for additional attributes before the content attribute.
* Searches for anything other than > symbol.
*/
'[^>]*' .
/*
* Find the content attribute. When found, capture its value (.*).
*
* Allows for (a) single or double quotes and (b) whitespace in the value.
*
* Why capture the opening quotation mark, i.e. (["\']), and then backreference,
* i.e \1, for the closing quotation mark?
* To ensure the closing quotation mark matches the opening one. Why? Attribute values
* can contain quotation marks, such as an apostrophe in the content.
*/
'content=(["\']??)(.*)\1' .
/*
* Allows for additional attributes after the content attribute.
* Searches for anything other than > symbol.
*/
'[^>]*' .
/*
* \/?> searches for the closing > symbol, which can be in either /> or > format.
* # ends the pattern.
*/
'\/?>#' .
/*
* These are the options:
* - i : case insensitive
* - s : allows newline characters for the . match (needed for multiline elements)
* - U means non-greedy matching
*/
'isU';
preg_match_all($pattern, $html, $elements);
return $elements;
}
}