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343 lines
13 KiB
PHP
343 lines
13 KiB
PHP
<?php
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/**
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* Site Config
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*
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* Each instance of this class should hold extraction patterns and other directives
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* for a website. See ContentExtractor class to see how it's used.
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*
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* @version 0.8
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* @date 2013-04-16
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* @author Keyvan Minoukadeh
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* @copyright 2013 Keyvan Minoukadeh
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* @license http://www.gnu.org/licenses/agpl-3.0.html AGPL v3
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*/
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class SiteConfig
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{
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// Use first matching element as title (0 or more xpath expressions)
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public $title = array();
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// Use first matching element as body (0 or more xpath expressions)
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public $body = array();
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// Use first matching element as author (0 or more xpath expressions)
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public $author = array();
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// Use first matching element as date (0 or more xpath expressions)
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public $date = array();
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// Strip elements matching these xpath expressions (0 or more)
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public $strip = array();
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// Strip elements which contain these strings (0 or more) in the id or class attribute
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public $strip_id_or_class = array();
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// Strip images which contain these strings (0 or more) in the src attribute
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public $strip_image_src = array();
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// Additional HTTP headers to send
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// NOT YET USED
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public $http_header = array();
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// Process HTML with tidy before creating DOM (bool or null if undeclared)
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public $tidy = null;
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protected $default_tidy = true; // used if undeclared
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// Autodetect title/body if xpath expressions fail to produce results.
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// Note that this applies to title and body separately, ie.
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// * if we get a body match but no title match, this option will determine whether we autodetect title
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// * if neither match, this determines whether we autodetect title and body.
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// Also note that this only applies when there is at least one xpath expression in title or body, ie.
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// * if title and body are both empty (no xpath expressions), this option has no effect (both title and body will be auto-detected)
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// * if there's an xpath expression for title and none for body, body will be auto-detected and this option will determine whether we auto-detect title if the xpath expression for it fails to produce results.
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// Usage scenario: you want to extract something specific from a set of URLs, e.g. a table, and if the table is not found, you want to ignore the entry completely. Auto-detection is unlikely to succeed here, so you construct your patterns and set this option to false. Another scenario may be a site where auto-detection has proven to fail (or worse, picked up the wrong content).
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// bool or null if undeclared
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public $autodetect_on_failure = null;
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protected $default_autodetect_on_failure = true; // used if undeclared
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// Clean up content block - attempt to remove elements that appear to be superfluous
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// bool or null if undeclared
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public $prune = null;
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protected $default_prune = true; // used if undeclared
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// Test URL - if present, can be used to test the config above
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public $test_url = array();
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// Single-page link - should identify a link element or URL pointing to the page holding the entire article
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// This is useful for sites which split their articles across multiple pages. Links to such pages tend to
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// display the first page with links to the other pages at the bottom. Often there is also a link to a page
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// which displays the entire article on one page (e.g. 'print view').
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// This should be an XPath expression identifying the link to that page. If present and we find a match,
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// we will retrieve that page and the rest of the options in this config will be applied to the new page.
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public $single_page_link = array();
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public $next_page_link = array();
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// Single-page link in feed? - same as above, but patterns applied to item description HTML taken from feed
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public $single_page_link_in_feed = array();
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// Which parser to use for turning raw HTML into a DOMDocument (either 'libxml' or 'html5lib')
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// string or null if undeclared
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public $parser = null;
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protected $default_parser = 'libxml'; // used if undeclared
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// Strings to search for in HTML before processing begins (used with $replace_string)
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public $find_string = array();
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// Strings to replace those found in $find_string before HTML processing begins
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public $replace_string = array();
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// the options below cannot be set in the config files which this class represents
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//public $cache_in_apc = false; // used to decide if we should cache in apc or not
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public $cache_key = null;
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public static $debug = false;
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protected static $apc = false;
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protected static $config_path;
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protected static $config_path_fallback;
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protected static $config_cache = array();
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const HOSTNAME_REGEX = '/^(([a-zA-Z0-9-]*[a-zA-Z0-9])\.)*([A-Za-z0-9-]*[A-Za-z0-9])$/';
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protected static function debug($msg) {
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if (self::$debug) {
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//$mem = round(memory_get_usage()/1024, 2);
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//$memPeak = round(memory_get_peak_usage()/1024, 2);
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echo '* ',$msg;
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//echo ' - mem used: ',$mem," (peak: $memPeak)\n";
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echo "\n";
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ob_flush();
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flush();
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}
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}
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// enable APC caching of certain site config files?
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// If enabled the following site config files will be
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// cached in APC cache (when requested for first time):
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// * anything in site_config/custom/ and its corresponding file in site_config/standard/
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// * the site config files associated with HTML fingerprints
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// * the global site config file
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// returns true if enabled, false otherwise
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public static function use_apc($apc=true) {
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if (!function_exists('apc_add')) {
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if ($apc) self::debug('APC will not be used (function apc_add does not exist)');
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return false;
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}
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self::$apc = $apc;
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return $apc;
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}
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// return bool or null
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public function tidy($use_default=true) {
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if ($use_default) return (isset($this->tidy)) ? $this->tidy : $this->default_tidy;
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return $this->tidy;
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}
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// return bool or null
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public function prune($use_default=true) {
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if ($use_default) return (isset($this->prune)) ? $this->prune : $this->default_prune;
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return $this->prune;
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}
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// return string or null
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public function parser($use_default=true) {
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if ($use_default) return (isset($this->parser)) ? $this->parser : $this->default_parser;
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return $this->parser;
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}
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// return bool or null
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public function autodetect_on_failure($use_default=true) {
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if ($use_default) return (isset($this->autodetect_on_failure)) ? $this->autodetect_on_failure : $this->default_autodetect_on_failure;
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return $this->autodetect_on_failure;
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}
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public static function set_config_path($path, $fallback=null) {
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self::$config_path = $path;
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self::$config_path_fallback = $fallback;
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}
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public static function add_to_cache($key, SiteConfig $config, $use_apc=true) {
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$key = strtolower($key);
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if (substr($key, 0, 4) == 'www.') $key = substr($key, 4);
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if ($config->cache_key) $key = $config->cache_key;
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self::$config_cache[$key] = $config;
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if (self::$apc && $use_apc) {
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self::debug("Adding site config to APC cache with key sc.$key");
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apc_add("sc.$key", $config);
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}
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self::debug("Cached site config with key $key");
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}
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public static function is_cached($key) {
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$key = strtolower($key);
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if (substr($key, 0, 4) == 'www.') $key = substr($key, 4);
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if (array_key_exists($key, self::$config_cache)) {
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return true;
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} elseif (self::$apc && (bool)apc_fetch("sc.$key")) {
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return true;
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}
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return false;
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}
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public function append(SiteConfig $newconfig) {
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// check for commands where we accept multiple statements (no test_url)
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foreach (array('title', 'body', 'author', 'date', 'strip', 'strip_id_or_class', 'strip_image_src', 'single_page_link', 'single_page_link_in_feed', 'next_page_link', 'http_header') as $var) {
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// append array elements for this config variable from $newconfig to this config
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//$this->$var = $this->$var + $newconfig->$var;
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$this->$var = array_unique(array_merge($this->$var, $newconfig->$var));
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}
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// check for single statement commands
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// we do not overwrite existing non null values
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foreach (array('tidy', 'prune', 'parser', 'autodetect_on_failure') as $var) {
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if ($this->$var === null) $this->$var = $newconfig->$var;
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}
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// treat find_string and replace_string separately (don't apply array_unique) (thanks fabrizio!)
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foreach (array('find_string', 'replace_string') as $var) {
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// append array elements for this config variable from $newconfig to this config
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//$this->$var = $this->$var + $newconfig->$var;
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$this->$var = array_merge($this->$var, $newconfig->$var);
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}
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}
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// returns SiteConfig instance if an appropriate one is found, false otherwise
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// if $exact_host_match is true, we will not look for wildcard config matches
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// by default if host is 'test.example.org' we will look for and load '.example.org.txt' if it exists
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public static function build($host, $exact_host_match=false) {
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$host = strtolower($host);
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if (substr($host, 0, 4) == 'www.') $host = substr($host, 4);
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if (!$host || (strlen($host) > 200) || !preg_match(self::HOSTNAME_REGEX, ltrim($host, '.'))) return false;
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// check for site configuration
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$try = array($host);
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// should we look for wildcard matches
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if (!$exact_host_match) {
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$split = explode('.', $host);
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if (count($split) > 1) {
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array_shift($split);
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$try[] = '.'.implode('.', $split);
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}
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}
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// look for site config file in primary folder
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self::debug(". looking for site config for $host in primary folder");
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foreach ($try as $h) {
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if (array_key_exists($h, self::$config_cache)) {
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self::debug("... site config for $h already loaded in this request");
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return self::$config_cache[$h];
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} elseif (self::$apc && ($sconfig = apc_fetch("sc.$h"))) {
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self::debug("... site config for $h in APC cache");
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return $sconfig;
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} elseif (file_exists(self::$config_path."/$h.txt")) {
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self::debug("... found site config ($h.txt)");
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$file_primary = self::$config_path."/$h.txt";
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$matched_name = $h;
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break;
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}
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}
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// if we found site config, process it
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if (isset($file_primary)) {
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$config_lines = file($file_primary, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
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if (!$config_lines || !is_array($config_lines)) return false;
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$config = self::build_from_array($config_lines);
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// if APC caching is available and enabled, mark this for cache
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//$config->cache_in_apc = true;
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$config->cache_key = $matched_name;
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// if autodetec on failure is off (on by default) we do not need to look
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// in secondary folder
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if (!$config->autodetect_on_failure()) {
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self::debug('... autodetect on failure is disabled (no other site config files will be loaded)');
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return $config;
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}
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}
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// look for site config file in secondary folder
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if (isset(self::$config_path_fallback)) {
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self::debug(". looking for site config for $host in secondary folder");
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foreach ($try as $h) {
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if (file_exists(self::$config_path_fallback."/$h.txt")) {
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self::debug("... found site config in secondary folder ($h.txt)");
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$file_secondary = self::$config_path_fallback."/$h.txt";
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$matched_name = $h;
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break;
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}
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}
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if (!isset($file_secondary)) {
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self::debug("... no site config match in secondary folder");
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}
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}
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// return false if no config file found
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if (!isset($file_primary) && !isset($file_secondary)) {
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self::debug("... no site config match for $host");
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return false;
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}
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// return primary config if secondary not found
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if (!isset($file_secondary) && isset($config)) {
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return $config;
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}
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// process secondary config file
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$config_lines = file($file_secondary, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
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if (!$config_lines || !is_array($config_lines)) {
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// failed to process secondary
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if (isset($config)) {
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// return primary config
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return $config;
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} else {
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return false;
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}
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}
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// merge with primary and return
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if (isset($config)) {
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self::debug('. merging config files');
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$config->append(self::build_from_array($config_lines));
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return $config;
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} else {
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// return just secondary
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$config = self::build_from_array($config_lines);
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// if APC caching is available and enabled, mark this for cache
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//$config->cache_in_apc = true;
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$config->cache_key = $matched_name;
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return $config;
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}
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}
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public static function build_from_array(array $lines) {
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$config = new SiteConfig();
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foreach ($lines as $line) {
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$line = trim($line);
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// skip comments, empty lines
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if ($line == '' || $line[0] == '#') continue;
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// get command
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$command = explode(':', $line, 2);
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// if there's no colon ':', skip this line
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if (count($command) != 2) continue;
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$val = trim($command[1]);
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$command = trim($command[0]);
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if ($command == '' || $val == '') continue;
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// check for commands where we accept multiple statements
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if (in_array($command, array('title', 'body', 'author', 'date', 'strip', 'strip_id_or_class', 'strip_image_src', 'single_page_link', 'single_page_link_in_feed', 'next_page_link', 'http_header', 'test_url', 'find_string', 'replace_string'))) {
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array_push($config->$command, $val);
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// check for single statement commands that evaluate to true or false
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} elseif (in_array($command, array('tidy', 'prune', 'autodetect_on_failure'))) {
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$config->$command = ($val == 'yes');
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// check for single statement commands stored as strings
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} elseif (in_array($command, array('parser'))) {
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$config->$command = $val;
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// check for replace_string(find): replace
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} elseif ((substr($command, -1) == ')') && preg_match('!^([a-z0-9_]+)\((.*?)\)$!i', $command, $match)) {
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if (in_array($match[1], array('replace_string'))) {
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$command = $match[1];
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array_push($config->find_string, $match[2]);
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array_push($config->$command, $val);
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}
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}
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}
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return $config;
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}
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} |