joyqi
121 lines
3.2 KiB
PHP
121 lines
3.2 KiB
PHP
<?php
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namespace IXR;
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use Typecho\Common;
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use Typecho\Http\Client as HttpClient;
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use Typecho\Http\Client\Exception as HttpException;
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/**
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* fetch pingback
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*/
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class Pingback
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{
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/**
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* @var string
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*/
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private $html;
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/**
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* @var string
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*/
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private $target;
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/**
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* @param string $url
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* @param string $target
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* @throws Exception
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*/
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public function __construct(string $url, string $target)
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{
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$client = HttpClient::get();
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$this->target = $target;
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if (!isset($client)) {
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throw new Exception('No available http client', 50);
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}
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try {
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$client->setTimeout(5)
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->send($url);
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} catch (HttpException $e) {
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throw new Exception('Pingback http error', 50);
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}
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if ($client->getResponseStatus() != 200) {
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throw new Exception('Pingback wrong http status', 50);
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}
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$response = $client->getResponseBody();
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$encoding = 'UTF-8';
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$contentType = $client->getResponseHeader('Content-Type');
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if (!empty($contentType) && preg_match("/charset=([_a-z0-9-]+)/i", $contentType, $matches)) {
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$encoding = strtoupper($matches[1]);
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} elseif (preg_match("/<meta\s+charset=\"([_a-z0-9-]+)\"/i", $response, $matches)) {
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$encoding = strtoupper($matches[1]);
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}
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$this->html = $encoding == 'UTF-8' ? $response : mb_convert_encoding($response, 'UTF-8', $encoding);
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if (
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!$client->getResponseHeader('X-Pingback') &&
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!preg_match_all("/<link[^>]*rel=[\"']pingback[\"'][^>]+href=[\"']([^\"']*)[\"'][^>]*>/i", $this->html)
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) {
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throw new Exception("Source server doesn't support pingback", 50);
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}
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}
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/**
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* get title
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*
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* @return string
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*/
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public function getTitle(): string
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{
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if (preg_match("/\<title\>([^<]*?)\<\/title\\>/is", $this->html, $matchTitle)) {
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return Common::subStr(Common::removeXSS(trim(strip_tags($matchTitle[1]))), 0, 150, '...');
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}
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return parse_url($this->target, PHP_URL_HOST);
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}
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/**
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* get content
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*
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* @return string
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* @throws Exception
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*/
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public function getContent(): string
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{
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/** 干掉html tag，只留下<a>*/
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$text = Common::stripTags($this->html, '<a href="">');
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/** 此处将$target quote,留着后面用*/
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$pregLink = preg_quote($this->target);
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/** 找出含有target链接的最长的一行作为$finalText*/
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$finalText = null;
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$lines = explode("\n", $text);
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foreach ($lines as $line) {
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$line = trim($line);
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if (null != $line) {
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if (preg_match("|<a[^>]*href=[\"']{$pregLink}[\"'][^>]*>(.*?)</a>|", $line)) {
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if (strlen($line) > strlen($finalText)) {
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/** <a>也要干掉，*/
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$finalText = Common::stripTags($line);
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break;
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}
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}
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}
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}
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if (!isset($finalText)) {
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throw new Exception("Source page doesn't have target url", 50);
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}
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return '[...]' . Common::subStr($finalText, 0, 200, '') . '[...]';
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}
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}
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