mirror of
https://github.com/wallabag/wallabag.git
synced 2024-12-04 23:06:27 +00:00
338 lines
13 KiB
PHP
338 lines
13 KiB
PHP
|
<?php
|
||
|
/**
|
||
|
* Site Config
|
||
|
*
|
||
|
* Each instance of this class should hold extraction patterns and other directives
|
||
|
* for a website. See ContentExtractor class to see how it's used.
|
||
|
*
|
||
|
* @version 0.7
|
||
|
* @date 2012-08-27
|
||
|
* @author Keyvan Minoukadeh
|
||
|
* @copyright 2012 Keyvan Minoukadeh
|
||
|
* @license http://www.gnu.org/licenses/agpl-3.0.html AGPL v3
|
||
|
*/
|
||
|
|
||
|
class SiteConfig
|
||
|
{
|
||
|
// Use first matching element as title (0 or more xpath expressions)
|
||
|
public $title = array();
|
||
|
|
||
|
// Use first matching element as body (0 or more xpath expressions)
|
||
|
public $body = array();
|
||
|
|
||
|
// Use first matching element as author (0 or more xpath expressions)
|
||
|
public $author = array();
|
||
|
|
||
|
// Use first matching element as date (0 or more xpath expressions)
|
||
|
public $date = array();
|
||
|
|
||
|
// Strip elements matching these xpath expressions (0 or more)
|
||
|
public $strip = array();
|
||
|
|
||
|
// Strip elements which contain these strings (0 or more) in the id or class attribute
|
||
|
public $strip_id_or_class = array();
|
||
|
|
||
|
// Strip images which contain these strings (0 or more) in the src attribute
|
||
|
public $strip_image_src = array();
|
||
|
|
||
|
// Additional HTTP headers to send
|
||
|
// NOT YET USED
|
||
|
public $http_header = array();
|
||
|
|
||
|
// Process HTML with tidy before creating DOM (bool or null if undeclared)
|
||
|
public $tidy = null;
|
||
|
|
||
|
protected $default_tidy = true; // used if undeclared
|
||
|
|
||
|
// Autodetect title/body if xpath expressions fail to produce results.
|
||
|
// Note that this applies to title and body separately, ie.
|
||
|
// * if we get a body match but no title match, this option will determine whether we autodetect title
|
||
|
// * if neither match, this determines whether we autodetect title and body.
|
||
|
// Also note that this only applies when there is at least one xpath expression in title or body, ie.
|
||
|
// * if title and body are both empty (no xpath expressions), this option has no effect (both title and body will be auto-detected)
|
||
|
// * 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.
|
||
|
// 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).
|
||
|
// bool or null if undeclared
|
||
|
public $autodetect_on_failure = null;
|
||
|
protected $default_autodetect_on_failure = true; // used if undeclared
|
||
|
|
||
|
// Clean up content block - attempt to remove elements that appear to be superfluous
|
||
|
// bool or null if undeclared
|
||
|
public $prune = null;
|
||
|
protected $default_prune = true; // used if undeclared
|
||
|
|
||
|
// Test URL - if present, can be used to test the config above
|
||
|
public $test_url = array();
|
||
|
|
||
|
// Single-page link - should identify a link element or URL pointing to the page holding the entire article
|
||
|
// This is useful for sites which split their articles across multiple pages. Links to such pages tend to
|
||
|
// display the first page with links to the other pages at the bottom. Often there is also a link to a page
|
||
|
// which displays the entire article on one page (e.g. 'print view').
|
||
|
// This should be an XPath expression identifying the link to that page. If present and we find a match,
|
||
|
// we will retrieve that page and the rest of the options in this config will be applied to the new page.
|
||
|
public $single_page_link = array();
|
||
|
|
||
|
public $next_page_link = array();
|
||
|
|
||
|
// Single-page link in feed? - same as above, but patterns applied to item description HTML taken from feed
|
||
|
public $single_page_link_in_feed = array();
|
||
|
|
||
|
// Which parser to use for turning raw HTML into a DOMDocument (either 'libxml' or 'html5lib')
|
||
|
// string or null if undeclared
|
||
|
public $parser = null;
|
||
|
protected $default_parser = 'libxml'; // used if undeclared
|
||
|
|
||
|
// Strings to search for in HTML before processing begins (used with $replace_string)
|
||
|
public $find_string = array();
|
||
|
// Strings to replace those found in $find_string before HTML processing begins
|
||
|
public $replace_string = array();
|
||
|
|
||
|
// the options below cannot be set in the config files which this class represents
|
||
|
|
||
|
//public $cache_in_apc = false; // used to decide if we should cache in apc or not
|
||
|
public $cache_key = null;
|
||
|
public static $debug = false;
|
||
|
protected static $apc = false;
|
||
|
protected static $config_path;
|
||
|
protected static $config_path_fallback;
|
||
|
protected static $config_cache = array();
|
||
|
const HOSTNAME_REGEX = '/^(([a-zA-Z0-9-]*[a-zA-Z0-9])\.)*([A-Za-z0-9-]*[A-Za-z0-9])$/';
|
||
|
|
||
|
protected static function debug($msg) {
|
||
|
if (self::$debug) {
|
||
|
//$mem = round(memory_get_usage()/1024, 2);
|
||
|
//$memPeak = round(memory_get_peak_usage()/1024, 2);
|
||
|
echo '* ',$msg;
|
||
|
//echo ' - mem used: ',$mem," (peak: $memPeak)\n";
|
||
|
echo "\n";
|
||
|
ob_flush();
|
||
|
flush();
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// enable APC caching of certain site config files?
|
||
|
// If enabled the following site config files will be
|
||
|
// cached in APC cache (when requested for first time):
|
||
|
// * anything in site_config/custom/ and its corresponding file in site_config/standard/
|
||
|
// * the site config files associated with HTML fingerprints
|
||
|
// * the global site config file
|
||
|
// returns true if enabled, false otherwise
|
||
|
public static function use_apc($apc=true) {
|
||
|
if (!function_exists('apc_add')) {
|
||
|
if ($apc) self::debug('APC will not be used (function apc_add does not exist)');
|
||
|
return false;
|
||
|
}
|
||
|
self::$apc = $apc;
|
||
|
return $apc;
|
||
|
}
|
||
|
|
||
|
// return bool or null
|
||
|
public function tidy($use_default=true) {
|
||
|
if ($use_default) return (isset($this->tidy)) ? $this->tidy : $this->default_tidy;
|
||
|
return $this->tidy;
|
||
|
}
|
||
|
|
||
|
// return bool or null
|
||
|
public function prune($use_default=true) {
|
||
|
if ($use_default) return (isset($this->prune)) ? $this->prune : $this->default_prune;
|
||
|
return $this->prune;
|
||
|
}
|
||
|
|
||
|
// return string or null
|
||
|
public function parser($use_default=true) {
|
||
|
if ($use_default) return (isset($this->parser)) ? $this->parser : $this->default_parser;
|
||
|
return $this->parser;
|
||
|
}
|
||
|
|
||
|
// return bool or null
|
||
|
public function autodetect_on_failure($use_default=true) {
|
||
|
if ($use_default) return (isset($this->autodetect_on_failure)) ? $this->autodetect_on_failure : $this->default_autodetect_on_failure;
|
||
|
return $this->autodetect_on_failure;
|
||
|
}
|
||
|
|
||
|
public static function set_config_path($path, $fallback=null) {
|
||
|
self::$config_path = $path;
|
||
|
self::$config_path_fallback = $fallback;
|
||
|
}
|
||
|
|
||
|
public static function add_to_cache($key, SiteConfig $config, $use_apc=true) {
|
||
|
$key = strtolower($key);
|
||
|
if (substr($key, 0, 4) == 'www.') $key = substr($key, 4);
|
||
|
if ($config->cache_key) $key = $config->cache_key;
|
||
|
self::$config_cache[$key] = $config;
|
||
|
if (self::$apc && $use_apc) {
|
||
|
self::debug("Adding site config to APC cache with key sc.$key");
|
||
|
apc_add("sc.$key", $config);
|
||
|
}
|
||
|
self::debug("Cached site config with key $key");
|
||
|
}
|
||
|
|
||
|
public static function is_cached($key) {
|
||
|
$key = strtolower($key);
|
||
|
if (substr($key, 0, 4) == 'www.') $key = substr($key, 4);
|
||
|
if (array_key_exists($key, self::$config_cache)) {
|
||
|
return true;
|
||
|
} elseif (self::$apc && (bool)apc_fetch("sc.$key")) {
|
||
|
return true;
|
||
|
}
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
public function append(SiteConfig $newconfig) {
|
||
|
// check for commands where we accept multiple statements (no test_url)
|
||
|
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', 'find_string', 'replace_string') as $var) {
|
||
|
// append array elements for this config variable from $newconfig to this config
|
||
|
//$this->$var = $this->$var + $newconfig->$var;
|
||
|
$this->$var = array_unique(array_merge($this->$var, $newconfig->$var));
|
||
|
}
|
||
|
// check for single statement commands
|
||
|
// we do not overwrite existing non null values
|
||
|
foreach (array('tidy', 'prune', 'parser', 'autodetect_on_failure') as $var) {
|
||
|
if ($this->$var === null) $this->$var = $newconfig->$var;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// returns SiteConfig instance if an appropriate one is found, false otherwise
|
||
|
// if $exact_host_match is true, we will not look for wildcard config matches
|
||
|
// by default if host is 'test.example.org' we will look for and load '.example.org.txt' if it exists
|
||
|
public static function build($host, $exact_host_match=false) {
|
||
|
$host = strtolower($host);
|
||
|
if (substr($host, 0, 4) == 'www.') $host = substr($host, 4);
|
||
|
if (!$host || (strlen($host) > 200) || !preg_match(self::HOSTNAME_REGEX, ltrim($host, '.'))) return false;
|
||
|
// check for site configuration
|
||
|
$try = array($host);
|
||
|
// should we look for wildcard matches
|
||
|
if (!$exact_host_match) {
|
||
|
$split = explode('.', $host);
|
||
|
if (count($split) > 1) {
|
||
|
array_shift($split);
|
||
|
$try[] = '.'.implode('.', $split);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// look for site config file in primary folder
|
||
|
self::debug(". looking for site config for $host in primary folder");
|
||
|
foreach ($try as $h) {
|
||
|
if (array_key_exists($h, self::$config_cache)) {
|
||
|
self::debug("... site config for $h already loaded in this request");
|
||
|
return self::$config_cache[$h];
|
||
|
} elseif (self::$apc && ($sconfig = apc_fetch("sc.$h"))) {
|
||
|
self::debug("... site config for $h in APC cache");
|
||
|
return $sconfig;
|
||
|
} elseif (file_exists(self::$config_path."/$h.txt")) {
|
||
|
self::debug("... found site config ($h.txt)");
|
||
|
$file_primary = self::$config_path."/$h.txt";
|
||
|
$matched_name = $h;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// if we found site config, process it
|
||
|
if (isset($file_primary)) {
|
||
|
$config_lines = file($file_primary, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
|
||
|
if (!$config_lines || !is_array($config_lines)) return false;
|
||
|
$config = self::build_from_array($config_lines);
|
||
|
// if APC caching is available and enabled, mark this for cache
|
||
|
//$config->cache_in_apc = true;
|
||
|
$config->cache_key = $matched_name;
|
||
|
|
||
|
// if autodetec on failure is off (on by default) we do not need to look
|
||
|
// in secondary folder
|
||
|
if (!$config->autodetect_on_failure()) {
|
||
|
self::debug('... autodetect on failure is disabled (no other site config files will be loaded)');
|
||
|
return $config;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// look for site config file in secondary folder
|
||
|
if (isset(self::$config_path_fallback)) {
|
||
|
self::debug(". looking for site config for $host in secondary folder");
|
||
|
foreach ($try as $h) {
|
||
|
if (file_exists(self::$config_path_fallback."/$h.txt")) {
|
||
|
self::debug("... found site config in secondary folder ($h.txt)");
|
||
|
$file_secondary = self::$config_path_fallback."/$h.txt";
|
||
|
$matched_name = $h;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
if (!isset($file_secondary)) {
|
||
|
self::debug("... no site config match in secondary folder");
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// return false if no config file found
|
||
|
if (!isset($file_primary) && !isset($file_secondary)) {
|
||
|
self::debug("... no site config match for $host");
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
// return primary config if secondary not found
|
||
|
if (!isset($file_secondary) && isset($config)) {
|
||
|
return $config;
|
||
|
}
|
||
|
|
||
|
// process secondary config file
|
||
|
$config_lines = file($file_secondary, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
|
||
|
if (!$config_lines || !is_array($config_lines)) {
|
||
|
// failed to process secondary
|
||
|
if (isset($config)) {
|
||
|
// return primary config
|
||
|
return $config;
|
||
|
} else {
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// merge with primary and return
|
||
|
if (isset($config)) {
|
||
|
self::debug('. merging config files');
|
||
|
$config->append(self::build_from_array($config_lines));
|
||
|
return $config;
|
||
|
} else {
|
||
|
// return just secondary
|
||
|
$config = self::build_from_array($config_lines);
|
||
|
// if APC caching is available and enabled, mark this for cache
|
||
|
//$config->cache_in_apc = true;
|
||
|
$config->cache_key = $matched_name;
|
||
|
return $config;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
public static function build_from_array(array $lines) {
|
||
|
$config = new SiteConfig();
|
||
|
foreach ($lines as $line) {
|
||
|
$line = trim($line);
|
||
|
|
||
|
// skip comments, empty lines
|
||
|
if ($line == '' || $line[0] == '#') continue;
|
||
|
|
||
|
// get command
|
||
|
$command = explode(':', $line, 2);
|
||
|
// if there's no colon ':', skip this line
|
||
|
if (count($command) != 2) continue;
|
||
|
$val = trim($command[1]);
|
||
|
$command = trim($command[0]);
|
||
|
if ($command == '' || $val == '') continue;
|
||
|
|
||
|
// check for commands where we accept multiple statements
|
||
|
if (in_array($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'))) {
|
||
|
array_push($config->$command, $val);
|
||
|
// check for single statement commands that evaluate to true or false
|
||
|
} elseif (in_array($command, array('tidy', 'prune', 'autodetect_on_failure'))) {
|
||
|
$config->$command = ($val == 'yes');
|
||
|
// check for single statement commands stored as strings
|
||
|
} elseif (in_array($command, array('parser'))) {
|
||
|
$config->$command = $val;
|
||
|
// check for replace_string(find): replace
|
||
|
} elseif ((substr($command, -1) == ')') && preg_match('!^([a-z0-9_]+)\((.*?)\)$!i', $command, $match)) {
|
||
|
if (in_array($match[1], array('replace_string'))) {
|
||
|
$command = $match[1];
|
||
|
array_push($config->find_string, $match[2]);
|
||
|
array_push($config->$command, $val);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
return $config;
|
||
|
}
|
||
|
}
|
||
|
?>
|