/**
* Try to get the favicon associated with some URLs, by parsing the header and
* trying to get the file favicon.ico at the root of the server
*
* @param an array $urls of URLs
* @return an array {'favicons', 'errors'}. `errors` is an array of URLs for which there could not be any fetched favicon. `favicons` is an array with URLs as keys and an array of favicon urls and sizes ({favicon_url, size}, associative array).
*/
function get_favicon($urls)
{
$favicons = array();
$errors = array();
$urls_to_fetch = array();
// Don't do first check for non HTML content
foreach ($urls as $url_array) {
if (endswith($url_array['url'], '.xml')) {
$errors[] = $url_array['url'];
} else {
$urls_to_fetch[] = $url_array;
}
}
$contents = curl_downloader($urls_to_fetch);
foreach ($contents['status_codes'] as $url => $status) {
if ($status != 200) {
$errors[] = $url;
}
}
foreach ($contents['results'] as $url => $content) {
$content = substr($content, 0, strpos($content, '</head>')) . '</head></html>';
// We don't need the full page, just the <head>
if ($content === '</head></html>') {
continue;
}
$html = new DOMDocument();
$html->strictErrorChecking = false;
$fail = @$html->loadHTML($content);
if ($fail === false) {
continue;
}
$xml = simplexml_import_dom($html);
if ($xml === false) {
continue;
}
// Try to fetch the favicon URL from the <head> tag
foreach ($xml->head->children() as $head_tag) {
if ($head_tag->getName() != 'link') {
continue;
}
$go_next_tag = false;
foreach ($head_tag->attributes() as $key => $attribute) {
if ($go_next_tag || $key != 'rel') {
continue;
}
if (strstr((string) $attribute, 'icon')) {
$tmp = $head_tag->attributes();
if (isset($tmp['sizes'])) {
$tmp = $head_tag->attributes();
$sizes = (string) $tmp['sizes'];
} else {
$sizes = '';
}
$favicons[$url][] = array('favicon_url' => (string) $tmp['href'], 'sizes' => $sizes);
$go_next_tag = true;
}
}
}
}
// Add to errors the URLs without any favicons associated
$favicons_keys = array_keys($favicons);
foreach ($contents['results'] as $url => $content) {
if (!in_array($url, $favicons_keys)) {
$errors[] = $url;
}
}
// Check for errorred feeds wether the favicon.ico file at the root exists
$second_try = array();
foreach ($errors as $url) {
$parsed_url = parse_url(trim($url));
$second_try_url = "";
if (isset($parsed_url['scheme'])) {
$second_try_url .= $parsed_url['scheme'] . '://';
}
if (isset($parsed_url['host'])) {
$second_try_url .= $parsed_url['host'];
}
if (isset($parsed_url['port'])) {
$second_try_url .= $parsed_url['port'];
}
if (isset($parsed_url['user'])) {
$second_try_url .= $parsed_url['user'];
}
if (isset($parsed_url['pass'])) {
$second_try_url .= $parsed_url['pass'];
}
$second_try[] = array('input_url' => $url, 'url' => $second_try_url . '/favicon.ico');
}
$second_try_curl = curl_downloader($second_try, false);
$errors = array();
foreach ($second_try as $tested_url) {
$status_code = (int) $second_try_curl['status_codes'][$tested_url['url']];
if ($status_code >= 200 && $status_code < 400) {
$favicons[$tested_url['input_url']][] = array('favicon_url' => $tested_url['url'], 'sizes' => '');
} else {
$errors[] = $tested_url['input_url'];
}
}
return array('favicons' => $favicons, 'errors' => $errors);
}
/**
* Try to get the feed URL associated to a URL to a HTML page, by parsing the header.
*
* @param an array $urls of {'url'=>URL}
* @return an array {'urls', 'errors'}. `errors` is an array of URLs for which there could not be any fetched feed. `urls` is an array with input URLs as keys and f{'url'=>URL} as values.
*/
function get_feed_url_from_html($urls_to_fetch)
{
$feeds = array();
$errors = array();
$contents = curl_downloader($urls_to_fetch);
foreach ($contents['status_codes'] as $url => $status) {
if ($status != 200) {
$errors[] = $url;
}
}
foreach ($contents['results'] as $url => $content) {
$content = substr($content, 0, strpos($content, '</head>')) . '</head></html>';
// We don't need the full page, just the <head>
$html = new DOMDocument();
$html->strictErrorChecking = false;
$fail = @$html->loadHTML($content);
if ($fail === false or empty($fail)) {
continue;
}
$xml = @simplexml_import_dom($html);
if ($xml === false or empty($xml)) {
continue;
}
// Try to fetch the favicon URL from the <head> tag
foreach ($xml->head->children() as $head_tag) {
if ($head_tag->getName() != 'link') {
continue;
}
foreach ($head_tag->attributes() as $key => $attribute) {
if ($key != 'type') {
continue;
}
if (strstr((string) $attribute, 'rss') || strstr((string) $attribute, 'atom')) {
$tmp = $head_tag->attributes();
$feeds[$url] = array('original_url' => $url, 'url' => (string) $tmp['href']);
}
}
}
}
return array('urls' => $feeds, 'errors' => $errors);
}
