<?php
-/*
- * tweeper - a Twitter to RSS web scraper
- *
- * Copyright (C) 2013 Antonio Ospite <ospite@studenti.unina.it>
- *
+/**
+ * @file
+ * Tweeper - a Twitter to RSS web scraper.
+ *
+ * Copyright (C) 2013-2015 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
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
- *
+ *
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
- *
+ *
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+require_once 'Symfony/Component/Serializer/autoload.php';
+
+use Symfony\Component\Serializer\Serializer;
+use Symfony\Component\Serializer\Encoder\XmlEncoder;
+use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
+
date_default_timezone_set('UTC');
+/**
+ * Scrape supported websites and perform conversion to RSS.
+ */
class Tweeper {
private static $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0";
- public function __construct($stylesheet, $generate_enclosure = FALSE) {
- $stylesheet_contents = $this->get_contents($stylesheet);
-
- $xslDoc = new DOMDocument();
- $xslDoc->loadXML($stylesheet_contents);
-
- $this->xsltProcessor = new XSLTProcessor();
- $this->xsltProcessor->registerPHPFunctions();
- $this->xsltProcessor->setParameter('', 'generateEnclosure', $generate_enclosure);
- $this->xsltProcessor->importStylesheet($xslDoc);
+ /**
+ * Constructor sets up {@link $generate_enclosure}.
+ */
+ public function __construct($generate_enclosure = FALSE) {
+ $this->generate_enclosure = $generate_enclosure;
}
- public static function epoch_to_gmdate($timestamp)
- {
+ /**
+ * Convert numeric Epoch to the date format expected in a RSS document.
+ */
+ 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)
- {
+ /**
+ * Convert generic date string to the date format expected in a RSS document.
+ */
+ 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($url)
- {
+ /**
+ * Get the contents from a URL.
+ */
+ private static function get_contents($url) {
$ch = curl_init($url);
curl_setopt_array($ch, array(
CURLOPT_HEADER => FALSE,
- CURLOPT_FOLLOWLOCATION => TRUE, // follow http redirects to get the real URL
+ // Follow http redirects to get the real URL.
+ CURLOPT_FOLLOWLOCATION => TRUE,
CURLOPT_RETURNTRANSFER => TRUE,
CURLOPT_SSL_VERIFYHOST => FALSE,
CURLOPT_SSL_VERIFYPEER => FALSE,
return $contents;
}
- private static function get_info($url)
- {
+ /**
+ * Get the headers from a URL.
+ */
+ 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
+ // Follow http redirects to get the real URL.
+ CURLOPT_FOLLOWLOCATION => TRUE,
CURLOPT_RETURNTRANSFER => TRUE,
CURLOPT_SSL_VERIFYHOST => FALSE,
CURLOPT_SSL_VERIFYPEER => FALSE,
return $url_info;
}
- public static function generate_enclosure($url)
- {
+ /**
+ * Generate an RSS <enclosure/> element.
+ */
+ 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",
"video/ogg",
);
- $url_info = Tweeper::get_info($url);
+ // 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) {
return $dom->saveXML($enc);
}
- public function tweep($uri) {
- $html = Tweeper::get_contents($uri);
+ /**
+ * 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);
+ }
+
+ /**
+ * Load a stylesheet if the web site is supported.
+ */
+ 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 $xsltProcessor;
+ }
+
+ /**
+ * Convert json to xml.
+ */
+ private function json_to_xml($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 $xml_data;
+ }
+
+ /**
+ * Convert the Instagram content to XML.
+ */
+ private function get_xml_instagram_com($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');
+ }
+
+ /**
+ * Make the Facebook HTML processable.
+ */
+ private function preprocess_html_facebook_com($html) {
+ $html = str_replace('<!--', '', $html);
+ $html = str_replace('-->', '', $html);
+ return $html;
+ }
+ /**
+ * Convert the HTML retrieved from the site to XML.
+ */
+ private function html_to_xml($html, $host) {
$xmlDoc = new DOMDocument();
- $xmlDoc->loadHTML($html);
- $output = $this->xsltProcessor->transformToXML($xmlDoc);
+ // 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 $xmlDoc;
+ }
+
+ /**
+ * Convert the site content to RSS.
+ */
+ public function tweep($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 $output;
}
+
}
-function usage($argv)
-{
- if (php_sapi_name() != 'cli')
- $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=<src_url>&generate_enclosure=<0|1>");
- else
+/**
+ * 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 {
+ $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=<src_url>&generate_enclosure=<0|1>");
+ }
return "usage: $usage";
}
-function parse_options_cli($argv, $argc)
-{
+/**
+ * Parse command line options.
+ */
+function parse_options_cli($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:
- die(usage($argv));
+ 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;
}
-function parse_options_query_string()
-{
+/**
+ * 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 (php_sapi_name() != 'cli')
- $options = parse_options_query_string();
-else
+if (is_cli()) {
$options = parse_options_cli($argv, $argc);
+ $ERROR_STREAM = fopen('php://stderr', 'w');
+}
+else {
+ $options = parse_options_query_string();
+ $ERROR_STREAM = fopen('php://output', 'w');
+}
-if (!isset($options['src_url']))
- die(usage($argv));
-
-$url = parse_url($options['src_url']);
-if (FALSE === $url || empty($url["host"]))
- die("Invalid url: ${options['src_url']}\n");
-
-$stylesheet = "file://" . __DIR__ . "/rss_converter_" . $url["host"] . ".xsl";
-if (FALSE === file_exists($stylesheet))
- die("Conversion to RSS not supported: {$url["host"]}\n");
+if (!isset($options['src_url'])) {
+ fwrite($ERROR_STREAM, usage(is_cli() ? $argv : NULL));
+ exit(1);
+}
-$tweeper = new Tweeper($stylesheet, $options['generate_enclosure']);
+$tweeper = new Tweeper($options['generate_enclosure']);
echo $tweeper->tweep($options['src_url']);
projects / tweeper.git / blobdiff