X-Git-Url: https://git.ao2.it/tweeper.git/blobdiff_plain/78ffdd0963e354dae561414aec7893336928ecc1..6c535395860b51d2c1debf92437192c6bf862b16:/src/Tweeper.php?ds=sidebyside diff --git a/src/Tweeper.php b/src/Tweeper.php index 566decb..d58b529 100644 --- a/src/Tweeper.php +++ b/src/Tweeper.php @@ -6,7 +6,7 @@ namespace Tweeper; * @file * Tweeper - a Twitter to RSS web scraper. * - * Copyright (C) 2013-2016 Antonio Ospite + * Copyright (C) 2013-2018 Antonio Ospite * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -36,13 +36,23 @@ date_default_timezone_set('UTC'); */ class Tweeper { - private static $userAgent = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0"; + private static $userAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Firefox/60.0"; + private static $maxConnectionTimeout = 5; + private static $maxConnectionRetries = 5; /** - * Constructor sets up {@link $generate_enclosure}. + * Create a new Tweeper object controlling optional settings. + * + * @param bool $generate_enclosure + * Enables the creation of elements (disabled by default). + * @param bool $show_usernames + * Enables showing the username in front of the content for multi-user + * sites (enabled by default). Only some stylesheets supports this + * functionality (twitter, instagram, pump.io). */ - public function __construct($generate_enclosure = FALSE) { + public function __construct($generate_enclosure = FALSE, $show_usernames = TRUE) { $this->generate_enclosure = $generate_enclosure; + $this->show_usernames = $show_usernames; } /** @@ -78,12 +88,32 @@ class Tweeper { } /** + * Perform a cURL session multiple times when it fails with a timeout. + * + * @param resource $ch + * a cURL session handle. + */ + private static function curlExec($ch) { + $ret = FALSE; + $attempt = 0; + do { + $ret = curl_exec($ch); + if (FALSE === $ret) { + trigger_error(curl_error($ch), E_USER_WARNING); + } + } while (curl_errno($ch) == CURLE_OPERATION_TIMEDOUT && ++$attempt < Tweeper::$maxConnectionRetries); + + return $ret; + } + + /** * Get the contents from a URL. */ private static function getUrlContents($url) { $ch = curl_init($url); curl_setopt_array($ch, array( CURLOPT_HEADER => FALSE, + CURLOPT_CONNECTTIMEOUT => Tweeper::$maxConnectionTimeout, // Follow http redirects to get the real URL. CURLOPT_FOLLOWLOCATION => TRUE, CURLOPT_RETURNTRANSFER => TRUE, @@ -92,10 +122,7 @@ class Tweeper { CURLOPT_HTTPHEADER => array('Accept-language: en'), CURLOPT_USERAGENT => Tweeper::$userAgent, )); - $contents = curl_exec($ch); - if (FALSE === $contents) { - trigger_error(curl_error($ch)); - } + $contents = Tweeper::curlExec($ch); curl_close($ch); return $contents; @@ -109,6 +136,7 @@ class Tweeper { curl_setopt_array($ch, array( CURLOPT_HEADER => TRUE, CURLOPT_NOBODY => TRUE, + CURLOPT_CONNECTTIMEOUT => Tweeper::$maxConnectionTimeout, // Follow http redirects to get the real URL. CURLOPT_FOLLOWLOCATION => TRUE, CURLOPT_RETURNTRANSFER => TRUE, @@ -116,10 +144,16 @@ class Tweeper { CURLOPT_SSL_VERIFYPEER => FALSE, CURLOPT_USERAGENT => Tweeper::$userAgent, )); - curl_exec($ch); + + $ret = Tweeper::curlExec($ch); + if (FALSE === $ret) { + curl_close($ch); + return FALSE; + } + $url_info = curl_getinfo($ch); if (FALSE === $url_info) { - trigger_error(curl_error($ch)); + trigger_error(curl_error($ch), E_USER_WARNING); } curl_close($ch); @@ -152,10 +186,14 @@ class Tweeper { ); $url_info = Tweeper::getUrlInfo($url); + if (FALSE === $url_info) { + trigger_error("Failed to retrieve info for URL: " . $url, E_USER_WARNING); + return ''; + } $supported = in_array($url_info['content_type'], $supported_content_types); if (!$supported) { - error_log("Unsupported enclosure content type \"" . $url_info['content_type'] . "\" for URL: " . $url_info['url']); + trigger_error("Unsupported enclosure content type \"" . $url_info['content_type'] . "\" for URL: " . $url_info['url'], E_USER_WARNING); return ''; } @@ -203,7 +241,7 @@ class Tweeper { $output .= " line $error->line"; - error_log($output); + trigger_error($output, E_USER_WARNING); } /** @@ -230,7 +268,7 @@ class Tweeper { $xml_data = $serializer->serialize($data, 'xml', $serializer_options); if (!$xml_data) { - trigger_error("Cannot serialize data", E_USER_ERROR); + trigger_error("Cannot serialize data", E_USER_WARNING); return NULL; } @@ -245,14 +283,20 @@ class Tweeper { $json_match_expr = '/window._sharedData = (.*);/'; $ret = preg_match($json_match_expr, $html, $matches); if ($ret !== 1) { - trigger_error("Cannot match expression: $json_match_expr\n", E_USER_ERROR); + trigger_error("Cannot match expression: $json_match_expr\n", E_USER_WARNING); return NULL; } + $data = json_decode($matches[1], $assoc = TRUE); + // The "qe" object contains elements which will result in invalid XML // element names, so remove it. - $data = json_decode($matches[1], $assoc = TRUE); unset($data["qe"]); + + // The "knobs" object contains elements with undefined namespaces, so + // remove it to silence an error message. + unset($data["knobs"]); + $json = json_encode($data); return Tweeper::jsonToXml($json, 'instagram'); @@ -301,11 +345,15 @@ class Tweeper { private function loadStylesheet($host) { $stylesheet = "file://" . __DIR__ . "/rss_converter_" . $host . ".xsl"; if (FALSE === file_exists($stylesheet)) { - trigger_error("Conversion to RSS not supported for $host ($stylesheet not found)", E_USER_ERROR); + trigger_error("Conversion to RSS not supported for $host ($stylesheet not found)", E_USER_WARNING); return NULL; } $stylesheet_contents = Tweeper::getUrlContents($stylesheet); + if (FALSE === $stylesheet_contents) { + trigger_error("Cannot open $stylesheet", E_USER_WARNING); + return NULL; + } $xslDoc = new DOMDocument(); $xslDoc->loadXML($stylesheet_contents); @@ -313,6 +361,7 @@ class Tweeper { $xsltProcessor = new XSLTProcessor(); $xsltProcessor->registerPHPFunctions(); $xsltProcessor->setParameter('', 'generate-enclosure', $this->generate_enclosure); + $xsltProcessor->setParameter('', 'show-usernames', $this->show_usernames); $xsltProcessor->importStylesheet($xslDoc); return $xsltProcessor; @@ -324,14 +373,14 @@ class Tweeper { public function tweep($src_url, $host=NULL, $validate_scheme=TRUE) { $url = parse_url($src_url); if (FALSE === $url) { - trigger_error("Invalid URL: $src_url", E_USER_ERROR); + trigger_error("Invalid URL: $src_url", E_USER_WARNING); return NULL; } if (TRUE === $validate_scheme) { $scheme = $url["scheme"]; if (!in_array($scheme, array("http", "https"))) { - trigger_error("unsupported scheme: $scheme", E_USER_ERROR); + trigger_error("unsupported scheme: $scheme", E_USER_WARNING); return NULL; } } @@ -339,7 +388,7 @@ class Tweeper { // if the host is not given derive it from the URL if (NULL === $host) { if (empty($url["host"])) { - trigger_error("Invalid host in URL: $src_url", E_USER_ERROR); + trigger_error("Invalid host in URL: $src_url", E_USER_WARNING); return NULL; } // Strip the leading www. to be more forgiving on input URLs. @@ -353,6 +402,7 @@ class Tweeper { $html = Tweeper::getUrlContents($src_url); if (FALSE === $html) { + trigger_error("Failed to retrieve $src_url", E_USER_WARNING); return NULL; } @@ -367,11 +417,11 @@ class Tweeper { } $output = $xsltProcessor->transformToXML($xmlDoc); - if (FALSE === $output) { - trigger_error('XSL transformation failed.', E_USER_ERROR); + trigger_error('XSL transformation failed.', E_USER_WARNING); return NULL; } + return $output; }