<?php
-/*
- * tweeper - a Twitter to RSS web scraper
+/**
+ * @file
+ * Tweeper - a Twitter to RSS web scraper.
*
- * Copyright (C) 2013-201
5 Antonio Ospite <ao2@ao2.it>
+ * Copyright (C) 2013-201
6 Antonio Ospite <ao2@ao2.it>
*
* 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-require_once 'Symfony/Component/Serializer/autoload.php';
+require_once 'autoload.php';
-use Symfony\Component\Serializer\Serializer;
-use Symfony\Component\Serializer\Encoder\XmlEncoder;
-use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
+use Tweeper\Tweeper;
date_default_timezone_set('UTC');
-class Tweeper {
-
- private static $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0";
-
- public function __construct($generate_enclosure = FALSE) {
- $this->generate_enclosure = $generate_enclosure;
- }
-
- public static function epoch_to_gmdate($timestamp) {
- if (!is_numeric($timestamp) || is_nan($timestamp)) {
- $timestamp = 0;
- }
-
- return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT';
- }
-
- public static function str_to_gmdate($date) {
- $timestamp = strtotime($date);
- if (FALSE === $timestamp) {
- $timestamp = 0;
- }
-
- return Tweeper::epoch_to_gmdate($timestamp);
- }
-
- private static function get_contents($url) {
- $ch = curl_init($url);
- curl_setopt_array($ch, array(
- CURLOPT_HEADER => FALSE,
- CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL
- CURLOPT_RETURNTRANSFER => TRUE,
- CURLOPT_SSL_VERIFYHOST => FALSE,
- CURLOPT_SSL_VERIFYPEER => FALSE,
- CURLOPT_HTTPHEADER => array('Accept-language: en'),
- CURLOPT_USERAGENT => Tweeper::$USER_AGENT,
- ));
- $contents = curl_exec($ch);
- curl_close($ch);
-
- return $contents;
- }
-
- private static function get_info($url) {
- $ch = curl_init($url);
- curl_setopt_array($ch, array(
- CURLOPT_HEADER => TRUE,
- CURLOPT_NOBODY => TRUE,
- CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL
- CURLOPT_RETURNTRANSFER => TRUE,
- CURLOPT_SSL_VERIFYHOST => FALSE,
- CURLOPT_SSL_VERIFYPEER => FALSE,
- CURLOPT_USERAGENT => Tweeper::$USER_AGENT,
- ));
- curl_exec($ch);
- $url_info = curl_getinfo($ch);
- curl_close($ch);
-
- return $url_info;
- }
-
- public static function generate_enclosure($url) {
- $supported_content_types = array(
- "application/ogg",
- "audio/aac",
- "audio/mp4",
- "audio/mpeg",
- "audio/ogg",
- "audio/vorbis",
- "audio/wav",
- "audio/webm",
- "audio/x-midi",
- "image/gif",
- "image/jpeg",
- "video/avi",
- "video/mp4",
- "video/mpeg",
- "video/ogg",
- );
-
- // The RSS specification says that the enclosure element url must be http.
- // See http://sourceforge.net/p/feedvalidator/bugs/72/
- $http_url = preg_replace("/^https/", "http", $url);
-
- $url_info = Tweeper::get_info($http_url);
-
- $supported = in_array($url_info['content_type'], $supported_content_types);
- if (!$supported) {
- error_log("Unsupported enclosure content type \"" . $url_info['content_type'] . "\" for URL: " . $url_info['url']);
- return '';
- }
-
- $dom = new DomDocument();
- $enc = $dom->createElement('enclosure');
- $enc->setAttribute('url', $url_info['url']);
- $enc->setAttribute('length', $url_info['download_content_length']);
- $enc->setAttribute('type', $url_info['content_type']);
-
- $dom->appendChild($enc);
-
- return $dom->saveXML($enc);
- }
-
- /* Mimic the message from libxml.c::php_libxml_ctx_error_level() */
- private function log_xml_error($error) {
- $output = "";
-
- switch ($error->level) {
- case LIBXML_ERR_WARNING:
- $output .= "Warning $error->code: ";
- break;
- case LIBXML_ERR_ERROR:
- $output .= "Error $error->code: ";
- break;
- case LIBXML_ERR_FATAL:
- $output .= "Fatal Error $error->code: ";
- break;
- }
-
- $output .= trim($error->message);
-
- if ($error->file) {
- $output .= " in $error->file";
- } else {
- $output .= " in Entity,";
- }
-
- $output .=" line $error->line";
-
- error_log($output);
- }
-
- private function load_stylesheet($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);
- return NULL;
- }
-
- $stylesheet_contents = $this->get_contents($stylesheet);
-
- $xslDoc = new DOMDocument();
- $xslDoc->loadXML($stylesheet_contents);
-
- $xsltProcessor = new XSLTProcessor();
- $xsltProcessor->registerPHPFunctions();
- $xsltProcessor->setParameter('', 'generateEnclosure', $this->generate_enclosure);
- $xsltProcessor->importStylesheet($xslDoc);
-
- return $xsltProcessor;
- }
-
- private function json_to_xml($json, $root_node_name) {
- // Apparenty the ObjectNormalizer used afterwards is not able to handle
- // the stdClass object created by json_decode() with the default setting
- // $assoc = false; so use $assoc = true
- $data = json_decode($json, $assoc = true);
- if (!$data) {
- return NULL;
- }
-
- $encoder = new XmlEncoder();
- $normalizer = new ObjectNormalizer();
- $serializer = new Serializer(array($normalizer), array($encoder));
-
- $serializer_options = array (
- 'xml_encoding' => "UTF-8",
- 'xml_format_output' => TRUE,
- 'xml_root_node_name' => $root_node_name,
- );
-
- $xml_data = $serializer->serialize($data, 'xml', $serializer_options);
- if (!$xml_data) {
- trigger_error("Cannot serialize data", E_USER_ERROR);
- return NULL;
- }
-
- return $xml_data;
- }
-
- private function get_xml_instagram_com($html) {
- // extract the json data from the html code
- $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);
- return NULL;
- }
-
- return $this->json_to_xml($matches[1], 'instagram');
- }
-
- private function preprocess_html_facebook_com($html) {
- $html = str_replace('<!--', '', $html);
- $html = str_replace('-->', '', $html);
- return $html;
- }
-
- private function html_to_xml($html, $host) {
- $xmlDoc = new DOMDocument();
-
- // Handle warnings and errors when loading invalid HTML.
- $xml_errors_value = libxml_use_internal_errors(true);
-
- // If there is a host-specific method to get the xml data, use it!
- $get_xml_host_method = 'get_xml_' . str_replace(".", "_", $host);
- if (method_exists($this, $get_xml_host_method)) {
- $xml_data = call_user_func_array(array($this, $get_xml_host_method), array($html));
- $xmlDoc->loadXML($xml_data);
- } else {
- $xmlDoc->loadHTML($html);
- }
-
- foreach (libxml_get_errors() as $xml_error) {
- $this->log_xml_error($xml_error);
- }
- libxml_clear_errors();
- libxml_use_internal_errors($xml_errors_value);
-
- return $xmlDoc;
- }
-
- public function tweep($src_url) {
- $url = parse_url($src_url);
- if (FALSE === $url || empty($url["host"])) {
- trigger_error("Invalid url: $src_url", E_USER_ERROR);
- return NULL;
- }
-
- // Strip the leading www. to be more forgiving on input URLs
- $host = preg_replace('/^www\./', '', $url["host"]);
-
- $xsltProcessor = $this->load_stylesheet($host);
- if (NULL === $xsltProcessor) {
- return NULL;
- }
-
- $html = $this->get_contents($src_url);
- if (FALSE === $html) {
- return NULL;
- }
-
- $preprocess_html_host_method = 'preprocess_html_' . str_replace(".", "_", $host);
- if (method_exists($this, $preprocess_html_host_method)) {
- $html = call_user_func_array(array($this, $preprocess_html_host_method), array($html));
- }
-
- $xmlDoc = $this->html_to_xml($html, $host);
- if (NULL === $xmlDoc) {
- return NULL;
- }
-
- $output = $xsltProcessor->transformToXML($xmlDoc);
-
- if (FALSE === $output) {
- trigger_error('XSL transformation failed.', E_USER_ERROR);
- return NULL;
- }
- return $output;
- }
-}
-
+/**
+ * Check if the script is being run from the command line.
+ */
function is_cli() {
return (php_sapi_name() === "cli");
}
+/**
+ * Show the script usage.
+ */
function usage($argv) {
if (is_cli()) {
$usage = "{$argv[0]} [-e|-h|--help] <src_url>\n";
- } else {
+ }
+ else {
$usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=<src_url>&generate_enclosure=<0|1>");
}
return "usage: $usage";
}
+/**
+ * Parse command line options.
+ */
function parse_options_cli($argv, $argc) {
$options = array(
- 'generate_enclosure' => FALSE
+ 'generate_enclosure' => FALSE,
);
- if ($argc < 2)
+ if ($argc < 2) {
return $options;
+ }
$cli_options = getopt("eh", array("help"));
foreach ($cli_options as $opt => $val) {
switch ($opt) {
- case 'e':
- $options['generate_enclosure'] = TRUE;
- break;
- case 'h':
- case 'help':
- echo usage($argv);
- exit(0);
- default:
- fwrite(STDERR, usage($argv));
- exit(1);
+ case 'e':
+ $options['generate_enclosure'] = TRUE;
+ break;
+
+ case 'h':
+ case 'help':
+ echo usage($argv);
+ exit(0);
+
+ default:
+ fwrite(STDERR, usage($argv));
+ exit(1);
}
}
return $options;
}
+/**
+ * Parse options passed from a query string.
+ */
function parse_options_query_string() {
$options = array(
- 'generate_enclosure' => FALSE
+ 'generate_enclosure' => FALSE,
);
- if (isset($_GET['src_url']))
+ if (isset($_GET['src_url'])) {
$options['src_url'] = $_GET['src_url'];
+ }
- if (isset($_GET['generate_enclosure']))
+ if (isset($_GET['generate_enclosure'])) {
$options['generate_enclosure'] = $_GET['generate_enclosure'] == 1;
+ }
return $options;
}
-
if (is_cli()) {
$options = parse_options_cli($argv, $argc);
- $ERROR_STREAM = fopen('php://stderr', 'w');
-} else {
+ $error_stream = fopen('php://stderr', 'w');
+}
+else {
$options = parse_options_query_string();
- $ERROR_STREAM = fopen('php://output', 'w');
+ $error_stream = fopen('php://output', 'w');
}
if (!isset($options['src_url'])) {
- fwrite($ERROR_STREAM, usage(is_cli() ? $argv : NULL));
+ fwrite($error_stream, usage(is_cli() ? $argv : NULL));
exit(1);
}
$tweeper = new Tweeper($options['generate_enclosure']);
-echo $tweeper->tweep($options['src_url']);
+$output = $tweeper->tweep($options['src_url']);
+if (is_null($output)) {
+ exit(1);
+}
+echo $output;
projects / tweeper.git / blobdiff