/**
* Given a URL extracted from a page, return an absolute URL
*
* Takes a URL (e.g. /test) extracted from a page (e.g. http://foo.com/bar/) and
* returns an absolute URL (e.g. http://foo.com/bar/test). Absolute URLs are
* returned as-is.
*
* A null value is returned in the event that the extracted_url is blank or it's
* unable to be parsed.
*
* @param string $extracted_url Relative or absolute URL extracted from page
* @param string $page_url URL of page
* @return string|null Absolute URL, or null
*/
function sist_relative_to_absolute_url($extracted_url, $page_url)
{
$extracted_url = trim($extracted_url);
if ($extracted_url === '') {
return null;
}
// check for a protocol-less URL
// (Note: there's a bug in PHP <= 5.4.7 where parsed URLs starting with //
// are treated as a path. So we're doing this check upfront.)
// http://php.net/manual/en/function.parse-url.php#example-4617
if (strpos($extracted_url, '//') === 0) {
// if this is a local URL, add the protocol to the URL
if (stripos($extracted_url, '//' . sist_origin_host()) === 0) {
$extracted_url = substr_replace($extracted_url, sist_origin_scheme() . '://', 0, 2);
}
return $extracted_url;
}
$parsed_extracted_url = parse_url($extracted_url);
// parse_url can sometimes return false; bail if it does
if ($parsed_extracted_url === false) {
return null;
}
if (isset($parsed_extracted_url['host'])) {
return $extracted_url;
} elseif (isset($parsed_extracted_url['scheme'])) {
// examples of schemes without hosts: java:, data:
return $extracted_url;
} else {
// no host on extracted page (might be relative url)
$path = isset($parsed_extracted_url['path']) ? $parsed_extracted_url['path'] : '';
$query = isset($parsed_extracted_url['query']) ? '?' . $parsed_extracted_url['query'] : '';
$fragment = isset($parsed_extracted_url['fragment']) ? '#' . $parsed_extracted_url['fragment'] : '';
// turn our relative url into an absolute url
$extracted_url = phpUri::parse($page_url)->join($path . $query . $fragment);
return $extracted_url;
}
}
/**
* Replaces base URL
*
* @param string $origin_url
* @param string $destination_url
* @return void
*/
public function replace_urls($destination_url)
{
/* TODO: Might want to eventually rope this into extract_urls_from_html/
extract_urls_from_css so that we're only doing preg_replace/
str_replace once. Only reason I'm not doing that now is because of
the fix for wp_json_encode.
*/
if ($this->is_html() || $this->is_css()) {
// replace any instance of the origin url, whether it starts with https://, http://, or //
$response_body = preg_replace('/(https?:)?\\/\\/' . addcslashes(sist_origin_host(), '/') . '/i', $destination_url, $this->body);
// also replace wp_json_encode'd urls, as used by WP's `concatemoji`
$response_body = str_replace(addcslashes(sist_origin_url(), '/'), addcslashes($destination_url, '/'), $response_body);
$this->body = $response_body;
}
}
