includes/SiteConfiguration.php

   1 <?php
   2 /**
   3  * This is a class used to hold configuration settings, particularly for multi-wiki sites.
   4  */
   5 class SiteConfiguration {
   6
   7         /**
   8          * Array of suffixes, for self::siteFromDB()
   9          */
  10         public $suffixes = array();
  11
  12         /**
  13          * Array of wikis, should be the same as $wgLocalDatabases
  14          */
  15         public $wikis = array();
  16
  17         /**
  18          * The whole array of settings
  19          */
  20         public $settings = array();
  21
  22         /**
  23          * Array of domains that are local and can be handled by the same server
  24          */
  25         public $localVHosts = array();
  26
  27         /**
  28          * Optional callback to load full configuration data.
  29          */
  30         public $fullLoadCallback = null;
  31
  32         /** Whether or not all data has been loaded */
  33         public $fullLoadDone = false;
  34
  35         /**
  36          * A callback function that returns an array with the following keys (all
  37          * optional):
  38          * - suffix: site's suffix
  39          * - lang: site's lang
  40          * - tags: array of wiki tags
  41          * - params: array of parameters to be replaced
  42          * The function will receive the SiteConfiguration instance in the first
  43          * argument and the wiki in the second one.
  44          * if suffix and lang are passed they will be used for the return value of
  45          * self::siteFromDB() and self::$suffixes will be ignored
  46          */
  47         public $siteParamsCallback = null;
  48
  49         /**
  50          * Retrieves a configuration setting for a given wiki.
  51          * @param $settingName String ID of the setting name to retrieve
  52          * @param $wiki String Wiki ID of the wiki in question.
  53          * @param $suffix String The suffix of the wiki in question.
  54          * @param $params Array List of parameters. $.'key' is replaced by $value in all returned data.
  55          * @param $wikiTags Array The tags assigned to the wiki.
  56          * @return Mixed the value of the setting requested.
  57          */
  58         public function get( $settingName, $wiki, $suffix = null, $params = array(), $wikiTags = array() ) {
  59                 $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
  60                 return $this->getSetting( $settingName, $wiki, $params );
  61         }
  62
  63         /**
  64          * Really retrieves a configuration setting for a given wiki.
  65          *
  66          * @param $settingName String ID of the setting name to retrieve.
  67          * @param $wiki String Wiki ID of the wiki in question.
  68          * @param $params Array: array of parameters.
  69          * @return Mixed the value of the setting requested.
  70          */
  71         protected function getSetting( $settingName, $wiki, /*array*/ $params ){
  72                 $retval = null;
  73                 if( array_key_exists( $settingName, $this->settings ) ) {
  74                         $thisSetting =& $this->settings[$settingName];
  75                         do {
  76                                 // Do individual wiki settings
  77                                 if( array_key_exists( $wiki, $thisSetting ) ) {
  78                                         $retval = $thisSetting[$wiki];
  79                                         break;
  80                                 } elseif( array_key_exists( "+$wiki", $thisSetting ) && is_array( $thisSetting["+$wiki"] ) ) {
  81                                         $retval = $thisSetting["+$wiki"];
  82                                 }
  83
  84                                 // Do tag settings
  85                                 foreach( $params['tags'] as $tag ) {
  86                                         if( array_key_exists( $tag, $thisSetting ) ) {
  87                                                 if ( isset( $retval ) && is_array( $retval ) && is_array( $thisSetting[$tag] ) ) {
  88                                                         $retval = self::arrayMerge( $retval, $thisSetting[$tag] );
  89                                                 } else {
  90                                                         $retval = $thisSetting[$tag];
  91                                                 }
  92                                                 break 2;
  93                                         } elseif( array_key_exists( "+$tag", $thisSetting ) && is_array($thisSetting["+$tag"]) ) {
  94                                                 if( !isset( $retval ) )
  95                                                         $retval = array();
  96                                                 $retval = self::arrayMerge( $retval, $thisSetting["+$tag"] );
  97                                         }
  98                                 }
  99                                 // Do suffix settings
 100                                 $suffix = $params['suffix'];
 101                                 if( !is_null( $suffix ) ) {
 102                                         if( array_key_exists( $suffix, $thisSetting ) ) {
 103                                                 if ( isset($retval) && is_array($retval) && is_array($thisSetting[$suffix]) ) {
 104                                                         $retval = self::arrayMerge( $retval, $thisSetting[$suffix] );
 105                                                 } else {
 106                                                         $retval = $thisSetting[$suffix];
 107                                                 }
 108                                                 break;
 109                                         } elseif( array_key_exists( "+$suffix", $thisSetting ) && is_array($thisSetting["+$suffix"]) ) {
 110                                                 if (!isset($retval))
 111                                                         $retval = array();
 112                                                 $retval = self::arrayMerge( $retval, $thisSetting["+$suffix"] );
 113                                         }
 114                                 }
 115
 116                                 // Fall back to default.
 117                                 if( array_key_exists( 'default', $thisSetting ) ) {
 118                                         if( is_array( $retval ) && is_array( $thisSetting['default'] ) ) {
 119                                                 $retval = self::arrayMerge( $retval, $thisSetting['default'] );
 120                                         } else {
 121                                                 $retval = $thisSetting['default'];
 122                                         }
 123                                         break;
 124                                 }
 125                         } while ( false );
 126                 }
 127
 128                 if( !is_null( $retval ) && count( $params['params'] ) ) {
 129                         foreach ( $params['params'] as $key => $value ) {
 130                                 $retval = $this->doReplace( '$' . $key, $value, $retval );
 131                         }
 132                 }
 133                 return $retval;
 134         }
 135
 136         /**
 137          * Type-safe string replace; won't do replacements on non-strings
 138          * private?
 139          *
 140          * @param $from
 141          * @param $to
 142          * @param $in
 143          * @return string
 144          */
 145         function doReplace( $from, $to, $in ) {
 146                 if( is_string( $in ) ) {
 147                         return str_replace( $from, $to, $in );
 148                 } elseif( is_array( $in ) ) {
 149                         foreach( $in as $key => $val ) {
 150                                 $in[$key] = $this->doReplace( $from, $to, $val );
 151                         }
 152                         return $in;
 153                 } else {
 154                         return $in;
 155                 }
 156         }
 157
 158         /**
 159          * Gets all settings for a wiki
 160          * @param $wiki String Wiki ID of the wiki in question.
 161          * @param $suffix String The suffix of the wiki in question.
 162          * @param $params Array List of parameters. $.'key' is replaced by $value in all returned data.
 163          * @param $wikiTags Array The tags assigned to the wiki.
 164          * @return Array Array of settings requested.
 165          */
 166         public function getAll( $wiki, $suffix = null, $params = array(), $wikiTags = array() ) {
 167                 $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
 168                 $localSettings = array();
 169                 foreach( $this->settings as $varname => $stuff ) {
 170                         $append = false;
 171                         $var = $varname;
 172                         if ( substr( $varname, 0, 1 ) == '+' ) {
 173                                 $append = true;
 174                                 $var = substr( $varname, 1 );
 175                         }
 176
 177                         $value = $this->getSetting( $varname, $wiki, $params );
 178                         if ( $append && is_array( $value ) && is_array( $GLOBALS[$var] ) )
 179                                 $value = self::arrayMerge( $value, $GLOBALS[$var] );
 180                         if ( !is_null( $value ) ) {
 181                                 $localSettings[$var] = $value;
 182                         }
 183                 }
 184                 return $localSettings;
 185         }
 186
 187         /**
 188          * Retrieves a configuration setting for a given wiki, forced to a boolean.
 189          * @param $setting String ID of the setting name to retrieve
 190          * @param $wiki String Wiki ID of the wiki in question.
 191          * @param $suffix String The suffix of the wiki in question.
 192          * @param $wikiTags Array The tags assigned to the wiki.
 193          * @return bool The value of the setting requested.
 194          */
 195         public function getBool( $setting, $wiki, $suffix = null, $wikiTags = array() ) {
 196                 return (bool)($this->get( $setting, $wiki, $suffix, array(), $wikiTags ) );
 197         }
 198
 199         /**
 200          * Retrieves an array of local databases
 201          *
 202          * @return array
 203          */
 204         function &getLocalDatabases() {
 205                 return $this->wikis;
 206         }
 207
 208         /**
 209          * Retrieves the value of a given setting, and places it in a variable passed by reference.
 210          * @param $setting String ID of the setting name to retrieve
 211          * @param $wiki String Wiki ID of the wiki in question.
 212          * @param $suffix String The suffix of the wiki in question.
 213          * @param $var array Reference The variable to insert the value into.
 214          * @param $params Array List of parameters. $.'key' is replaced by $value in all returned data.
 215          * @param $wikiTags Array The tags assigned to the wiki.
 216          */
 217         public function extractVar( $setting, $wiki, $suffix, &$var, $params = array(), $wikiTags = array() ) {
 218                 $value = $this->get( $setting, $wiki, $suffix, $params, $wikiTags );
 219                 if ( !is_null( $value ) ) {
 220                         $var = $value;
 221                 }
 222         }
 223
 224         /**
 225          * Retrieves the value of a given setting, and places it in its corresponding global variable.
 226          * @param $setting String ID of the setting name to retrieve
 227          * @param $wiki String Wiki ID of the wiki in question.
 228          * @param $suffix String The suffix of the wiki in question.
 229          * @param $params Array List of parameters. $.'key' is replaced by $value in all returned data.
 230          * @param $wikiTags Array The tags assigned to the wiki.
 231          */
 232         public function extractGlobal( $setting, $wiki, $suffix = null, $params = array(), $wikiTags = array() ) {
 233                 $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
 234                 $this->extractGlobalSetting( $setting, $wiki, $params );
 235         }
 236
 237         /**
 238          * @param $setting string
 239          * @param $wiki string
 240          * @param $params array
 241          */
 242         public function extractGlobalSetting( $setting, $wiki, $params ) {
 243                 $value = $this->getSetting( $setting, $wiki, $params );
 244                 if ( !is_null( $value ) ) {
 245                         if (substr($setting,0,1) == '+' && is_array($value)) {
 246                                 $setting = substr($setting,1);
 247                                 if ( is_array($GLOBALS[$setting]) ) {
 248                                         $GLOBALS[$setting] = self::arrayMerge( $GLOBALS[$setting], $value );
 249                                 } else {
 250                                         $GLOBALS[$setting] = $value;
 251                                 }
 252                         } else {
 253                                 $GLOBALS[$setting] = $value;
 254                         }
 255                 }
 256         }
 257
 258         /**
 259          * Retrieves the values of all settings, and places them in their corresponding global variables.
 260          * @param $wiki String Wiki ID of the wiki in question.
 261          * @param $suffix String The suffix of the wiki in question.
 262          * @param $params Array List of parameters. $.'key' is replaced by $value in all returned data.
 263          * @param $wikiTags Array The tags assigned to the wiki.
 264          */
 265         public function extractAllGlobals( $wiki, $suffix = null, $params = array(), $wikiTags = array() ) {
 266                 $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
 267                 foreach ( $this->settings as $varName => $setting ) {
 268                         $this->extractGlobalSetting( $varName, $wiki, $params );
 269                 }
 270         }
 271
 272         /**
 273          * Return specific settings for $wiki
 274          * See the documentation of self::$siteParamsCallback for more in-depth
 275          * documentation about this function
 276          *
 277          * @param $wiki String
 278          * @return array
 279          */
 280         protected function getWikiParams( $wiki ){
 281                 static $default = array(
 282                         'suffix' => null,
 283                         'lang' => null,
 284                         'tags' => array(),
 285                         'params' => array(),
 286                 );
 287
 288                 if( !is_callable( $this->siteParamsCallback ) ) {
 289                         return $default;
 290                 }
 291
 292                 $ret = call_user_func_array( $this->siteParamsCallback, array( $this, $wiki ) );
 293                 # Validate the returned value
 294                 if( !is_array( $ret ) ) {
 295                         return $default;
 296                 }
 297
 298                 foreach( $default as $name => $def ){
 299                         if( !isset( $ret[$name] ) || ( is_array( $default[$name] ) && !is_array( $ret[$name] ) ) )
 300                                 $ret[$name] = $default[$name];
 301                 }
 302
 303                 return $ret;
 304         }
 305
 306         /**
 307          * Merge params between the ones passed to the function and the ones given
 308          * by self::$siteParamsCallback for backward compatibility
 309          * Values returned by self::getWikiParams() have the priority.
 310          *
 311          * @param $wiki String Wiki ID of the wiki in question.
 312          * @param $suffix String The suffix of the wiki in question.
 313          * @param $params Array List of parameters. $.'key' is replaced by $value in
 314          *                all returned data.
 315          * @param $wikiTags Array The tags assigned to the wiki.
 316          * @return array
 317          */
 318         protected function mergeParams( $wiki, $suffix, /*array*/ $params, /*array*/ $wikiTags ){
 319                 $ret = $this->getWikiParams( $wiki );
 320
 321                 if( is_null( $ret['suffix'] ) )
 322                         $ret['suffix'] = $suffix;
 323
 324                 $ret['tags'] = array_unique( array_merge( $ret['tags'], $wikiTags ) );
 325
 326                 $ret['params'] += $params;
 327
 328                 // Automatically fill that ones if needed
 329                 if( !isset( $ret['params']['lang'] ) && !is_null( $ret['lang'] ) )
 330                         $ret['params']['lang'] = $ret['lang'];
 331                 if( !isset( $ret['params']['site'] ) && !is_null( $ret['suffix'] ) )
 332                         $ret['params']['site'] = $ret['suffix'];
 333
 334                 return $ret;
 335         }
 336
 337         /**
 338          * Work out the site and language name from a database name
 339          * @param $db
 340          *
 341          * @return array
 342          */
 343         public function siteFromDB( $db ) {
 344                 // Allow override
 345                 $def = $this->getWikiParams( $db );
 346                 if( !is_null( $def['suffix'] ) && !is_null( $def['lang'] ) )
 347                         return array( $def['suffix'], $def['lang'] );
 348
 349                 $site = null;
 350                 $lang = null;
 351                 foreach ( $this->suffixes as $suffix ) {
 352                         if ( $suffix === '' ) {
 353                                 $site = '';
 354                                 $lang = $db;
 355                                 break;
 356                         } elseif ( substr( $db, -strlen( $suffix ) ) == $suffix ) {
 357                                 $site = $suffix == 'wiki' ? 'wikipedia' : $suffix;
 358                                 $lang = substr( $db, 0, strlen( $db ) - strlen( $suffix ) );
 359                                 break;
 360                         }
 361                 }
 362                 $lang = str_replace( '_', '-', $lang );
 363                 return array( $site, $lang );
 364         }
 365
 366         /**
 367          * Returns true if the given vhost is handled locally.
 368          * @param $vhost String
 369          * @return bool
 370          */
 371         public function isLocalVHost( $vhost ) {
 372                 return in_array( $vhost, $this->localVHosts );
 373         }
 374
 375         /**
 376          * Merge multiple arrays together.
 377          * On encountering duplicate keys, merge the two, but ONLY if they're arrays.
 378          * PHP's array_merge_recursive() merges ANY duplicate values into arrays,
 379          * which is not fun
 380          *
 381          * @param $array1 array
 382          *
 383          * @return array
 384          */
 385         static function arrayMerge( $array1/* ... */ ) {
 386                 $out = $array1;
 387                 for( $i = 1; $i < func_num_args(); $i++ ) {
 388                         foreach( func_get_arg( $i ) as $key => $value ) {
 389                                 if ( isset($out[$key]) && is_array($out[$key]) && is_array($value) ) {
 390                                         $out[$key] = self::arrayMerge( $out[$key], $value );
 391                                 } elseif ( !isset($out[$key]) || !$out[$key] && !is_numeric($key) ) {
 392                                         // Values that evaluate to true given precedence, for the primary purpose of merging permissions arrays.
 393                                         $out[$key] = $value;
 394                                 } elseif ( is_numeric( $key ) ) {
 395                                         $out[] = $value;
 396                                 }
 397                         }
 398                 }
 399
 400                 return $out;
 401         }
 402
 403         public function loadFullData() {
 404                 if ($this->fullLoadCallback && !$this->fullLoadDone) {
 405                         call_user_func( $this->fullLoadCallback, $this );
 406                         $this->fullLoadDone = true;
 407                 }
 408         }
 409 }