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authortcitworld <thomas.citharet@gmail.com>2014-01-04 12:30:31 -0800
committertcitworld <thomas.citharet@gmail.com>2014-01-04 12:30:31 -0800
commit7f667839764621b5aa01c9db8ce5dde2a29ef18f (patch)
tree93d8241ee81c87e18494325ae02f0589a8e328a2 /inc/3rdparty/libraries/content-extractor/SiteConfig.php
parenta84f77d6ba15a64ff00453f5d5190c021ce460ed (diff)
parent2abcccb37180c17318f5226f5d4bc28f30b621ea (diff)
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Merge pull request #1 from inthepoche/dev
Dev
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1<?php
2/**
3 * Site Config
4 *
5 * Each instance of this class should hold extraction patterns and other directives
6 * for a website. See ContentExtractor class to see how it's used.
7 *
8 * @version 0.7
9 * @date 2012-08-27
10 * @author Keyvan Minoukadeh
11 * @copyright 2012 Keyvan Minoukadeh
12 * @license http://www.gnu.org/licenses/agpl-3.0.html AGPL v3
13 */
14
15class SiteConfig
16{
17 // Use first matching element as title (0 or more xpath expressions)
18 public $title = array();
19
20 // Use first matching element as body (0 or more xpath expressions)
21 public $body = array();
22
23 // Use first matching element as author (0 or more xpath expressions)
24 public $author = array();
25
26 // Use first matching element as date (0 or more xpath expressions)
27 public $date = array();
28
29 // Strip elements matching these xpath expressions (0 or more)
30 public $strip = array();
31
32 // Strip elements which contain these strings (0 or more) in the id or class attribute
33 public $strip_id_or_class = array();
34
35 // Strip images which contain these strings (0 or more) in the src attribute
36 public $strip_image_src = array();
37
38 // Additional HTTP headers to send
39 // NOT YET USED
40 public $http_header = array();
41
42 // Process HTML with tidy before creating DOM (bool or null if undeclared)
43 public $tidy = null;
44
45 protected $default_tidy = true; // used if undeclared
46
47 // Autodetect title/body if xpath expressions fail to produce results.
48 // Note that this applies to title and body separately, ie.
49 // * if we get a body match but no title match, this option will determine whether we autodetect title
50 // * if neither match, this determines whether we autodetect title and body.
51 // Also note that this only applies when there is at least one xpath expression in title or body, ie.
52 // * if title and body are both empty (no xpath expressions), this option has no effect (both title and body will be auto-detected)
53 // * 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.
54 // 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).
55 // bool or null if undeclared
56 public $autodetect_on_failure = null;
57 protected $default_autodetect_on_failure = true; // used if undeclared
58
59 // Clean up content block - attempt to remove elements that appear to be superfluous
60 // bool or null if undeclared
61 public $prune = null;
62 protected $default_prune = true; // used if undeclared
63
64 // Test URL - if present, can be used to test the config above
65 public $test_url = array();
66
67 // Single-page link - should identify a link element or URL pointing to the page holding the entire article
68 // This is useful for sites which split their articles across multiple pages. Links to such pages tend to
69 // display the first page with links to the other pages at the bottom. Often there is also a link to a page
70 // which displays the entire article on one page (e.g. 'print view').
71 // This should be an XPath expression identifying the link to that page. If present and we find a match,
72 // we will retrieve that page and the rest of the options in this config will be applied to the new page.
73 public $single_page_link = array();
74
75 public $next_page_link = array();
76
77 // Single-page link in feed? - same as above, but patterns applied to item description HTML taken from feed
78 public $single_page_link_in_feed = array();
79
80 // Which parser to use for turning raw HTML into a DOMDocument (either 'libxml' or 'html5lib')
81 // string or null if undeclared
82 public $parser = null;
83 protected $default_parser = 'libxml'; // used if undeclared
84
85 // Strings to search for in HTML before processing begins (used with $replace_string)
86 public $find_string = array();
87 // Strings to replace those found in $find_string before HTML processing begins
88 public $replace_string = array();
89
90 // the options below cannot be set in the config files which this class represents
91
92 //public $cache_in_apc = false; // used to decide if we should cache in apc or not
93 public $cache_key = null;
94 public static $debug = false;
95 protected static $apc = false;
96 protected static $config_path;
97 protected static $config_path_fallback;
98 protected static $config_cache = array();
99 const HOSTNAME_REGEX = '/^(([a-zA-Z0-9-]*[a-zA-Z0-9])\.)*([A-Za-z0-9-]*[A-Za-z0-9])$/';
100
101 protected static function debug($msg) {
102 if (self::$debug) {
103 //$mem = round(memory_get_usage()/1024, 2);
104 //$memPeak = round(memory_get_peak_usage()/1024, 2);
105 echo '* ',$msg;
106 //echo ' - mem used: ',$mem," (peak: $memPeak)\n";
107 echo "\n";
108 ob_flush();
109 flush();
110 }
111 }
112
113 // enable APC caching of certain site config files?
114 // If enabled the following site config files will be
115 // cached in APC cache (when requested for first time):
116 // * anything in site_config/custom/ and its corresponding file in site_config/standard/
117 // * the site config files associated with HTML fingerprints
118 // * the global site config file
119 // returns true if enabled, false otherwise
120 public static function use_apc($apc=true) {
121 if (!function_exists('apc_add')) {
122 if ($apc) self::debug('APC will not be used (function apc_add does not exist)');
123 return false;
124 }
125 self::$apc = $apc;
126 return $apc;
127 }
128
129 // return bool or null
130 public function tidy($use_default=true) {
131 if ($use_default) return (isset($this->tidy)) ? $this->tidy : $this->default_tidy;
132 return $this->tidy;
133 }
134
135 // return bool or null
136 public function prune($use_default=true) {
137 if ($use_default) return (isset($this->prune)) ? $this->prune : $this->default_prune;
138 return $this->prune;
139 }
140
141 // return string or null
142 public function parser($use_default=true) {
143 if ($use_default) return (isset($this->parser)) ? $this->parser : $this->default_parser;
144 return $this->parser;
145 }
146
147 // return bool or null
148 public function autodetect_on_failure($use_default=true) {
149 if ($use_default) return (isset($this->autodetect_on_failure)) ? $this->autodetect_on_failure : $this->default_autodetect_on_failure;
150 return $this->autodetect_on_failure;
151 }
152
153 public static function set_config_path($path, $fallback=null) {
154 self::$config_path = $path;
155 self::$config_path_fallback = $fallback;
156 }
157
158 public static function add_to_cache($key, SiteConfig $config, $use_apc=true) {
159 $key = strtolower($key);
160 if (substr($key, 0, 4) == 'www.') $key = substr($key, 4);
161 if ($config->cache_key) $key = $config->cache_key;
162 self::$config_cache[$key] = $config;
163 if (self::$apc && $use_apc) {
164 self::debug("Adding site config to APC cache with key sc.$key");
165 apc_add("sc.$key", $config);
166 }
167 self::debug("Cached site config with key $key");
168 }
169
170 public static function is_cached($key) {
171 $key = strtolower($key);
172 if (substr($key, 0, 4) == 'www.') $key = substr($key, 4);
173 if (array_key_exists($key, self::$config_cache)) {
174 return true;
175 } elseif (self::$apc && (bool)apc_fetch("sc.$key")) {
176 return true;
177 }
178 return false;
179 }
180
181 public function append(SiteConfig $newconfig) {
182 // check for commands where we accept multiple statements (no test_url)
183 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) {
184 // append array elements for this config variable from $newconfig to this config
185 //$this->$var = $this->$var + $newconfig->$var;
186 $this->$var = array_unique(array_merge($this->$var, $newconfig->$var));
187 }
188 // check for single statement commands
189 // we do not overwrite existing non null values
190 foreach (array('tidy', 'prune', 'parser', 'autodetect_on_failure') as $var) {
191 if ($this->$var === null) $this->$var = $newconfig->$var;
192 }
193 }
194
195 // returns SiteConfig instance if an appropriate one is found, false otherwise
196 // if $exact_host_match is true, we will not look for wildcard config matches
197 // by default if host is 'test.example.org' we will look for and load '.example.org.txt' if it exists
198 public static function build($host, $exact_host_match=false) {
199 $host = strtolower($host);
200 if (substr($host, 0, 4) == 'www.') $host = substr($host, 4);
201 if (!$host || (strlen($host) > 200) || !preg_match(self::HOSTNAME_REGEX, ltrim($host, '.'))) return false;
202 // check for site configuration
203 $try = array($host);
204 // should we look for wildcard matches
205 if (!$exact_host_match) {
206 $split = explode('.', $host);
207 if (count($split) > 1) {
208 array_shift($split);
209 $try[] = '.'.implode('.', $split);
210 }
211 }
212
213 // look for site config file in primary folder
214 self::debug(". looking for site config for $host in primary folder");
215 foreach ($try as $h) {
216 if (array_key_exists($h, self::$config_cache)) {
217 self::debug("... site config for $h already loaded in this request");
218 return self::$config_cache[$h];
219 } elseif (self::$apc && ($sconfig = apc_fetch("sc.$h"))) {
220 self::debug("... site config for $h in APC cache");
221 return $sconfig;
222 } elseif (file_exists(self::$config_path."/$h.txt")) {
223 self::debug("... found site config ($h.txt)");
224 $file_primary = self::$config_path."/$h.txt";
225 $matched_name = $h;
226 break;
227 }
228 }
229
230 // if we found site config, process it
231 if (isset($file_primary)) {
232 $config_lines = file($file_primary, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
233 if (!$config_lines || !is_array($config_lines)) return false;
234 $config = self::build_from_array($config_lines);
235 // if APC caching is available and enabled, mark this for cache
236 //$config->cache_in_apc = true;
237 $config->cache_key = $matched_name;
238
239 // if autodetec on failure is off (on by default) we do not need to look
240 // in secondary folder
241 if (!$config->autodetect_on_failure()) {
242 self::debug('... autodetect on failure is disabled (no other site config files will be loaded)');
243 return $config;
244 }
245 }
246
247 // look for site config file in secondary folder
248 if (isset(self::$config_path_fallback)) {
249 self::debug(". looking for site config for $host in secondary folder");
250 foreach ($try as $h) {
251 if (file_exists(self::$config_path_fallback."/$h.txt")) {
252 self::debug("... found site config in secondary folder ($h.txt)");
253 $file_secondary = self::$config_path_fallback."/$h.txt";
254 $matched_name = $h;
255 break;
256 }
257 }
258 if (!isset($file_secondary)) {
259 self::debug("... no site config match in secondary folder");
260 }
261 }
262
263 // return false if no config file found
264 if (!isset($file_primary) && !isset($file_secondary)) {
265 self::debug("... no site config match for $host");
266 return false;
267 }
268
269 // return primary config if secondary not found
270 if (!isset($file_secondary) && isset($config)) {
271 return $config;
272 }
273
274 // process secondary config file
275 $config_lines = file($file_secondary, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
276 if (!$config_lines || !is_array($config_lines)) {
277 // failed to process secondary
278 if (isset($config)) {
279 // return primary config
280 return $config;
281 } else {
282 return false;
283 }
284 }
285
286 // merge with primary and return
287 if (isset($config)) {
288 self::debug('. merging config files');
289 $config->append(self::build_from_array($config_lines));
290 return $config;
291 } else {
292 // return just secondary
293 $config = self::build_from_array($config_lines);
294 // if APC caching is available and enabled, mark this for cache
295 //$config->cache_in_apc = true;
296 $config->cache_key = $matched_name;
297 return $config;
298 }
299 }
300
301 public static function build_from_array(array $lines) {
302 $config = new SiteConfig();
303 foreach ($lines as $line) {
304 $line = trim($line);
305
306 // skip comments, empty lines
307 if ($line == '' || $line[0] == '#') continue;
308
309 // get command
310 $command = explode(':', $line, 2);
311 // if there's no colon ':', skip this line
312 if (count($command) != 2) continue;
313 $val = trim($command[1]);
314 $command = trim($command[0]);
315 if ($command == '' || $val == '') continue;
316
317 // check for commands where we accept multiple statements
318 if (in_array($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'))) {
319 array_push($config->$command, $val);
320 // check for single statement commands that evaluate to true or false
321 } elseif (in_array($command, array('tidy', 'prune', 'autodetect_on_failure'))) {
322 $config->$command = ($val == 'yes');
323 // check for single statement commands stored as strings
324 } elseif (in_array($command, array('parser'))) {
325 $config->$command = $val;
326 // check for replace_string(find): replace
327 } elseif ((substr($command, -1) == ')') && preg_match('!^([a-z0-9_]+)\((.*?)\)$!i', $command, $match)) {
328 if (in_array($match[1], array('replace_string'))) {
329 $command = $match[1];
330 array_push($config->find_string, $match[2]);
331 array_push($config->$command, $val);
332 }
333 }
334 }
335 return $config;
336 }
337}
338?> \ No newline at end of file