From: Aaron Schulz Date: Thu, 16 Apr 2015 17:40:04 +0000 (-0700) Subject: Moved ChangeTags to /changetags X-Git-Tag: 1.31.0-rc.0~11684 X-Git-Url: http://git.cyclocoop.org/%7B%24www_url%7Dadmin/compta/exercices/modifier.php?a=commitdiff_plain;h=48f6aa6d2f8263d0607852736d2bc83c71e10488;p=lhc%2Fweb%2Fwiklou.git Moved ChangeTags to /changetags Change-Id: I55a8f00d3aa2717d0bf6480ab1a694f29b429de0 --- diff --git a/autoload.php b/autoload.php index 54e4f6cf3b..38d1ac0818 100644 --- a/autoload.php +++ b/autoload.php @@ -205,7 +205,7 @@ $wgAutoloadLocalClasses = array( 'CdbWriter' => __DIR__ . '/includes/CdbCompat.php', 'CgzCopyTransaction' => __DIR__ . '/maintenance/storage/recompressTracked.php', 'ChangePassword' => __DIR__ . '/maintenance/changePassword.php', - 'ChangeTags' => __DIR__ . '/includes/ChangeTags.php', + 'ChangeTags' => __DIR__ . '/includes/changetags/ChangeTags.php', 'ChangeTagsList' => __DIR__ . '/includes/changetags/ChangeTagsList.php', 'ChangeTagsLogItem' => __DIR__ . '/includes/changetags/ChangeTagsLogItem.php', 'ChangeTagsLogList' => __DIR__ . '/includes/changetags/ChangeTagsLogList.php', diff --git a/includes/ChangeTags.php b/includes/ChangeTags.php deleted file mode 100644 index 43f957ce44..0000000000 --- a/includes/ChangeTags.php +++ /dev/null @@ -1,1222 +0,0 @@ - 'mw-tag-marker ' . - Sanitizer::escapeClass( "mw-tag-marker-$tag" ) ), - $description - ); - $classes[] = Sanitizer::escapeClass( "mw-tag-$tag" ); - } - - if ( !$displayTags ) { - return array( '', array() ); - } - - $markers = wfMessage( 'tag-list-wrapper' ) - ->numParams( count( $displayTags ) ) - ->rawParams( $wgLang->commaList( $displayTags ) ) - ->parse(); - $markers = Xml::tags( 'span', array( 'class' => 'mw-tag-markers' ), $markers ); - - return array( $markers, $classes ); - } - - /** - * Get a short description for a tag. - * - * Checks if message key "mediawiki:tag-$tag" exists. If it does not, - * returns the HTML-escaped tag name. Uses the message if the message - * exists, provided it is not disabled. If the message is disabled, - * we consider the tag hidden, and return false. - * - * @param string $tag Tag - * @return string|bool Tag description or false if tag is to be hidden. - * @since 1.25 Returns false if tag is to be hidden. - */ - public static function tagDescription( $tag ) { - $msg = wfMessage( "tag-$tag" ); - if ( !$msg->exists() ) { - // No such message, so return the HTML-escaped tag name. - return htmlspecialchars( $tag ); - } - if ( $msg->isDisabled() ) { - // The message exists but is disabled, hide the tag. - return false; - } - - // Message exists and isn't disabled, use it. - return $msg->parse(); - } - - /** - * Add tags to a change given its rc_id, rev_id and/or log_id - * - * @param string|array $tags Tags to add to the change - * @param int|null $rc_id The rc_id of the change to add the tags to - * @param int|null $rev_id The rev_id of the change to add the tags to - * @param int|null $log_id The log_id of the change to add the tags to - * @param string $params Params to put in the ct_params field of table 'change_tag' - * - * @throws MWException - * @return bool False if no changes are made, otherwise true - */ - public static function addTags( $tags, $rc_id = null, $rev_id = null, - $log_id = null, $params = null - ) { - $result = self::updateTags( $tags, null, $rc_id, $rev_id, $log_id, $params ); - return (bool)$result[0]; - } - - /** - * Add and remove tags to/from a change given its rc_id, rev_id and/or log_id, - * without verifying that the tags exist or are valid. If a tag is present in - * both $tagsToAdd and $tagsToRemove, it will be removed. - * - * This function should only be used by extensions to manipulate tags they - * have registered using the ListDefinedTags hook. When dealing with user - * input, call updateTagsWithChecks() instead. - * - * @param string|array|null $tagsToAdd Tags to add to the change - * @param string|array|null $tagsToRemove Tags to remove from the change - * @param int|null &$rc_id The rc_id of the change to add the tags to. - * Pass a variable whose value is null if the rc_id is not relevant or unknown. - * @param int|null &$rev_id The rev_id of the change to add the tags to. - * Pass a variable whose value is null if the rev_id is not relevant or unknown. - * @param int|null &$log_id The log_id of the change to add the tags to. - * Pass a variable whose value is null if the log_id is not relevant or unknown. - * @param string $params Params to put in the ct_params field of table - * 'change_tag' when adding tags - * - * @throws MWException When $rc_id, $rev_id and $log_id are all null - * @return array Index 0 is an array of tags actually added, index 1 is an - * array of tags actually removed, index 2 is an array of tags present on the - * revision or log entry before any changes were made - * - * @since 1.25 - */ - public static function updateTags( $tagsToAdd, $tagsToRemove, &$rc_id = null, - &$rev_id = null, &$log_id = null, $params = null ) { - - $tagsToAdd = array_filter( (array)$tagsToAdd ); // Make sure we're submitting all tags... - $tagsToRemove = array_filter( (array)$tagsToRemove ); - - if ( !$rc_id && !$rev_id && !$log_id ) { - throw new MWException( 'At least one of: RCID, revision ID, and log ID MUST be ' . - 'specified when adding or removing a tag from a change!' ); - } - - $dbw = wfGetDB( DB_MASTER ); - - // Might as well look for rcids and so on. - if ( !$rc_id ) { - // Info might be out of date, somewhat fractionally, on slave. - if ( $log_id ) { - $rc_id = $dbw->selectField( - 'recentchanges', - 'rc_id', - array( 'rc_logid' => $log_id ), - __METHOD__ - ); - } elseif ( $rev_id ) { - $rc_id = $dbw->selectField( - 'recentchanges', - 'rc_id', - array( 'rc_this_oldid' => $rev_id ), - __METHOD__ - ); - } - } elseif ( !$log_id && !$rev_id ) { - // Info might be out of date, somewhat fractionally, on slave. - $log_id = $dbw->selectField( - 'recentchanges', - 'rc_logid', - array( 'rc_id' => $rc_id ), - __METHOD__ - ); - $rev_id = $dbw->selectField( - 'recentchanges', - 'rc_this_oldid', - array( 'rc_id' => $rc_id ), - __METHOD__ - ); - } - - // update the tag_summary row - $prevTags = array(); - if ( !self::updateTagSummaryRow( $tagsToAdd, $tagsToRemove, $rc_id, $rev_id, - $log_id, $prevTags ) ) { - - // nothing to do - return array( array(), array(), $prevTags ); - } - - // insert a row into change_tag for each new tag - if ( count( $tagsToAdd ) ) { - $tagsRows = array(); - foreach ( $tagsToAdd as $tag ) { - // Filter so we don't insert NULLs as zero accidentally. - // Keep in mind that $rc_id === null means "I don't care/know about the - // rc_id, just delete $tag on this revision/log entry". It doesn't - // mean "only delete tags on this revision/log WHERE rc_id IS NULL". - $tagsRows[] = array_filter( - array( - 'ct_tag' => $tag, - 'ct_rc_id' => $rc_id, - 'ct_log_id' => $log_id, - 'ct_rev_id' => $rev_id, - 'ct_params' => $params - ) - ); - } - - $dbw->insert( 'change_tag', $tagsRows, __METHOD__, array( 'IGNORE' ) ); - } - - // delete from change_tag - if ( count( $tagsToRemove ) ) { - foreach ( $tagsToRemove as $tag ) { - $conds = array_filter( - array( - 'ct_tag' => $tag, - 'ct_rc_id' => $rc_id, - 'ct_log_id' => $log_id, - 'ct_rev_id' => $rev_id - ) - ); - $dbw->delete( 'change_tag', $conds, __METHOD__ ); - } - } - - self::purgeTagUsageCache(); - return array( $tagsToAdd, $tagsToRemove, $prevTags ); - } - - /** - * Adds or removes a given set of tags to/from the relevant row of the - * tag_summary table. Modifies the tagsToAdd and tagsToRemove arrays to - * reflect the tags that were actually added and/or removed. - * - * @param array &$tagsToAdd - * @param array &$tagsToRemove If a tag is present in both $tagsToAdd and - * $tagsToRemove, it will be removed - * @param int|null $rc_id Null if not known or not applicable - * @param int|null $rev_id Null if not known or not applicable - * @param int|null $log_id Null if not known or not applicable - * @param array &$prevTags Optionally outputs a list of the tags that were - * in the tag_summary row to begin with - * @return bool True if any modifications were made, otherwise false - * @since 1.25 - */ - protected static function updateTagSummaryRow( &$tagsToAdd, &$tagsToRemove, - $rc_id, $rev_id, $log_id, &$prevTags = array() ) { - - $dbw = wfGetDB( DB_MASTER ); - - $tsConds = array_filter( array( - 'ts_rc_id' => $rc_id, - 'ts_rev_id' => $rev_id, - 'ts_log_id' => $log_id - ) ); - - // Can't both add and remove a tag at the same time... - $tagsToAdd = array_diff( $tagsToAdd, $tagsToRemove ); - - // Update the summary row. - // $prevTags can be out of date on slaves, especially when addTags is called consecutively, - // causing loss of tags added recently in tag_summary table. - $prevTags = $dbw->selectField( 'tag_summary', 'ts_tags', $tsConds, __METHOD__ ); - $prevTags = $prevTags ? $prevTags : ''; - $prevTags = array_filter( explode( ',', $prevTags ) ); - - // add tags - $tagsToAdd = array_values( array_diff( $tagsToAdd, $prevTags ) ); - $newTags = array_unique( array_merge( $prevTags, $tagsToAdd ) ); - - // remove tags - $tagsToRemove = array_values( array_intersect( $tagsToRemove, $newTags ) ); - $newTags = array_values( array_diff( $newTags, $tagsToRemove ) ); - - sort( $prevTags ); - sort( $newTags ); - if ( $prevTags == $newTags ) { - // No change. - return false; - } - - if ( !$newTags ) { - // no tags left, so delete the row altogether - $dbw->delete( 'tag_summary', $tsConds, __METHOD__ ); - } else { - $dbw->replace( 'tag_summary', - array( 'ts_rev_id', 'ts_rc_id', 'ts_log_id' ), - array_filter( array_merge( $tsConds, array( 'ts_tags' => implode( ',', $newTags ) ) ) ), - __METHOD__ - ); - } - - return true; - } - - /** - * Helper function to generate a fatal status with a 'not-allowed' type error. - * - * @param string $msgOne Message key to use in the case of one tag - * @param string $msgMulti Message key to use in the case of more than one tag - * @param array $tags Restricted tags (passed as $1 into the message, count of - * $tags passed as $2) - * @return Status - * @since 1.25 - */ - protected static function restrictedTagError( $msgOne, $msgMulti, $tags ) { - $lang = RequestContext::getMain()->getLanguage(); - $count = count( $tags ); - return Status::newFatal( ( $count > 1 ) ? $msgMulti : $msgOne, - $lang->commaList( $tags ), $count ); - } - - /** - * Is it OK to allow the user to apply all the specified tags at the same time - * as they edit/make the change? - * - * @param array $tags Tags that you are interested in applying - * @param User|null $user User whose permission you wish to check, or null if - * you don't care (e.g. maintenance scripts) - * @return Status - * @since 1.25 - */ - public static function canAddTagsAccompanyingChange( array $tags, - User $user = null ) { - - if ( !is_null( $user ) && !$user->isAllowed( 'applychangetags' ) ) { - return Status::newFatal( 'tags-apply-no-permission' ); - } - - // to be applied, a tag has to be explicitly defined - // @todo Allow extensions to define tags that can be applied by users... - $allowedTags = self::listExplicitlyDefinedTags(); - $disallowedTags = array_diff( $tags, $allowedTags ); - if ( $disallowedTags ) { - return self::restrictedTagError( 'tags-apply-not-allowed-one', - 'tags-apply-not-allowed-multi', $disallowedTags ); - } - - return Status::newGood(); - } - - /** - * Adds tags to a given change, checking whether it is allowed first, but - * without adding a log entry. Useful for cases where the tag is being added - * along with the action that generated the change (e.g. tagging an edit as - * it is being made). - * - * Extensions should not use this function, unless directly handling a user - * request to add a particular tag. Normally, extensions should call - * ChangeTags::updateTags() instead. - * - * @param array $tags Tags to apply - * @param int|null $rc_id The rc_id of the change to add the tags to - * @param int|null $rev_id The rev_id of the change to add the tags to - * @param int|null $log_id The log_id of the change to add the tags to - * @param string $params Params to put in the ct_params field of table - * 'change_tag' when adding tags - * @param User $user Who to give credit for the action - * @return Status - * @since 1.25 - */ - public static function addTagsAccompanyingChangeWithChecks( array $tags, - $rc_id, $rev_id, $log_id, $params, User $user ) { - - // are we allowed to do this? - $result = self::canAddTagsAccompanyingChange( $tags, $user ); - if ( !$result->isOK() ) { - $result->value = null; - return $result; - } - - // do it! - self::addTags( $tagsToAdd, $rc_id, $rev_id, $log_id, $params ); - - return Status::newGood( true ); - } - - /** - * Is it OK to allow the user to adds and remove the given tags tags to/from a - * change? - * - * @param array $tagsToAdd Tags that you are interested in adding - * @param array $tagsToRemove Tags that you are interested in removing - * @param User|null $user User whose permission you wish to check, or null if - * you don't care (e.g. maintenance scripts) - * @return Status - * @since 1.25 - */ - public static function canUpdateTags( array $tagsToAdd, array $tagsToRemove, - User $user = null ) { - - if ( !is_null( $user ) && !$user->isAllowed( 'changetags' ) ) { - return Status::newFatal( 'tags-update-no-permission' ); - } - - // to be added, a tag has to be explicitly defined - // @todo Allow extensions to define tags that can be applied by users... - $explicitlyDefinedTags = self::listExplicitlyDefinedTags(); - $diff = array_diff( $tagsToAdd, $explicitlyDefinedTags ); - if ( $diff ) { - return self::restrictedTagError( 'tags-update-add-not-allowed-one', - 'tags-update-add-not-allowed-multi', $diff ); - } - - // to be removed, a tag has to be either explicitly defined or not defined - // at all - $definedTags = self::listDefinedTags(); - $diff = array_diff( $tagsToRemove, $explicitlyDefinedTags ); - if ( $diff ) { - $intersect = array_intersect( $diff, $definedTags ); - if ( $intersect ) { - return self::restrictedTagError( 'tags-update-remove-not-allowed-one', - 'tags-update-remove-not-allowed-multi', $intersect ); - } - } - - return Status::newGood(); - } - - /** - * Adds and/or removes tags to/from a given change, checking whether it is - * allowed first, and adding a log entry afterwards. - * - * Includes a call to ChangeTag::canUpdateTags(), so your code doesn't need - * to do that. However, it doesn't check whether the *_id parameters are a - * valid combination. That is up to you to enforce. See ApiTag::execute() for - * an example. - * - * @param array|null $tagsToAdd If none, pass array() or null - * @param array|null $tagsToRemove If none, pass array() or null - * @param int|null $rc_id The rc_id of the change to add the tags to - * @param int|null $rev_id The rev_id of the change to add the tags to - * @param int|null $log_id The log_id of the change to add the tags to - * @param string $params Params to put in the ct_params field of table - * 'change_tag' when adding tags - * @param string $reason Comment for the log - * @param User $user Who to give credit for the action - * @return Status If successful, the value of this Status object will be an - * object (stdClass) with the following fields: - * - logId: the ID of the added log entry, or null if no log entry was added - * (i.e. no operation was performed) - * - addedTags: an array containing the tags that were actually added - * - removedTags: an array containing the tags that were actually removed - * @since 1.25 - */ - public static function updateTagsWithChecks( $tagsToAdd, $tagsToRemove, - $rc_id, $rev_id, $log_id, $params, $reason, User $user ) { - - if ( is_null( $tagsToAdd ) ) { - $tagsToAdd = array(); - } - if ( is_null( $tagsToRemove ) ) { - $tagsToRemove = array(); - } - if ( !$tagsToAdd && !$tagsToRemove ) { - // no-op, don't bother - return Status::newGood( (object)array( - 'logId' => null, - 'addedTags' => array(), - 'removedTags' => array(), - ) ); - } - - // are we allowed to do this? - $result = self::canUpdateTags( $tagsToAdd, $tagsToRemove, $user ); - if ( !$result->isOK() ) { - $result->value = null; - return $result; - } - - // basic rate limiting - if ( $user->pingLimiter( 'changetag' ) ) { - return Status::newFatal( 'actionthrottledtext' ); - } - - // do it! - list( $tagsAdded, $tagsRemoved, $initialTags ) = self::updateTags( $tagsToAdd, - $tagsToRemove, $rc_id, $rev_id, $log_id, $params ); - if ( !$tagsAdded && !$tagsRemoved ) { - // no-op, don't log it - return Status::newGood( (object)array( - 'logId' => null, - 'addedTags' => array(), - 'removedTags' => array(), - ) ); - } - - // log it - $logEntry = new ManualLogEntry( 'tag', 'update' ); - $logEntry->setPerformer( $user ); - $logEntry->setComment( $reason ); - - // find the appropriate target page - if ( $rev_id ) { - $rev = Revision::newFromId( $rev_id ); - if ( $rev ) { - $title = $rev->getTitle(); - $logEntry->setTarget( $rev->getTitle() ); - } - } elseif ( $log_id ) { - // This function is from revision deletion logic and has nothing to do with - // change tags, but it appears to be the only other place in core where we - // perform logged actions on log items. - $logEntry->setTarget( RevDelLogList::suggestTarget( 0, array( $log_id ) ) ); - } - - if ( !$logEntry->getTarget() ) { - // target is required, so we have to set something - $logEntry->setTarget( SpecialPage::getTitleFor( 'Tags' ) ); - } - - $logParams = array( - '4::revid' => $rev_id, - '5::logid' => $log_id, - '6:list:tagsAdded' => $tagsAdded, - '7:number:tagsAddedCount' => count( $tagsAdded ), - '8:list:tagsRemoved' => $tagsRemoved, - '9:number:tagsRemovedCount' => count( $tagsRemoved ), - 'initialTags' => $initialTags, - ); - $logEntry->setParameters( $logParams ); - $logEntry->setRelations( array( 'Tag' => array_merge( $tagsAdded, $tagsRemoved ) ) ); - - $dbw = wfGetDB( DB_MASTER ); - $logId = $logEntry->insert( $dbw ); - // Only send this to UDP, not RC, similar to patrol events - $logEntry->publish( $logId, 'udp' ); - - return Status::newGood( (object)array( - 'logId' => $logId, - 'addedTags' => $tagsAdded, - 'removedTags' => $tagsRemoved, - ) ); - } - - /** - * Applies all tags-related changes to a query. - * Handles selecting tags, and filtering. - * Needs $tables to be set up properly, so we can figure out which join conditions to use. - * - * @param string|array $tables Table names, see DatabaseBase::select - * @param string|array $fields Fields used in query, see DatabaseBase::select - * @param string|array $conds Conditions used in query, see DatabaseBase::select - * @param array $join_conds Join conditions, see DatabaseBase::select - * @param array $options Options, see Database::select - * @param bool|string $filter_tag Tag to select on - * - * @throws MWException When unable to determine appropriate JOIN condition for tagging - */ - public static function modifyDisplayQuery( &$tables, &$fields, &$conds, - &$join_conds, &$options, $filter_tag = false ) { - global $wgRequest, $wgUseTagFilter; - - if ( $filter_tag === false ) { - $filter_tag = $wgRequest->getVal( 'tagfilter' ); - } - - // Figure out which conditions can be done. - if ( in_array( 'recentchanges', $tables ) ) { - $join_cond = 'ct_rc_id=rc_id'; - } elseif ( in_array( 'logging', $tables ) ) { - $join_cond = 'ct_log_id=log_id'; - } elseif ( in_array( 'revision', $tables ) ) { - $join_cond = 'ct_rev_id=rev_id'; - } elseif ( in_array( 'archive', $tables ) ) { - $join_cond = 'ct_rev_id=ar_rev_id'; - } else { - throw new MWException( 'Unable to determine appropriate JOIN condition for tagging.' ); - } - - $fields['ts_tags'] = wfGetDB( DB_SLAVE )->buildGroupConcatField( - ',', 'change_tag', 'ct_tag', $join_cond - ); - - if ( $wgUseTagFilter && $filter_tag ) { - // Somebody wants to filter on a tag. - // Add an INNER JOIN on change_tag - - $tables[] = 'change_tag'; - $join_conds['change_tag'] = array( 'INNER JOIN', $join_cond ); - $conds['ct_tag'] = $filter_tag; - } - } - - /** - * Build a text box to select a change tag - * - * @param string $selected Tag to select by default - * @param bool $fullForm - * - if false, then it returns an array of (label, form). - * - if true, it returns an entire form around the selector. - * @param Title $title Title object to send the form to. - * Used when, and only when $fullForm is true. - * @return string|array - * - if $fullForm is false: Array with - * - if $fullForm is true: String, html fragment - */ - public static function buildTagFilterSelector( $selected = '', - $fullForm = false, Title $title = null - ) { - global $wgUseTagFilter; - - if ( !$wgUseTagFilter || !count( self::listDefinedTags() ) ) { - return $fullForm ? '' : array(); - } - - $data = array( - Html::rawElement( - 'label', - array( 'for' => 'tagfilter' ), - wfMessage( 'tag-filter' )->parse() - ), - Xml::input( - 'tagfilter', - 20, - $selected, - array( 'class' => 'mw-tagfilter-input mw-ui-input mw-ui-input-inline', 'id' => 'tagfilter' ) - ) - ); - - if ( !$fullForm ) { - return $data; - } - - $html = implode( ' ', $data ); - $html .= "\n" . - Xml::element( - 'input', - array( 'type' => 'submit', 'value' => wfMessage( 'tag-filter-submit' )->text() ) - ); - $html .= "\n" . Html::hidden( 'title', $title->getPrefixedText() ); - $html = Xml::tags( - 'form', - array( 'action' => $title->getLocalURL(), 'class' => 'mw-tagfilter-form', 'method' => 'get' ), - $html - ); - - return $html; - } - - /** - * Defines a tag in the valid_tag table, without checking that the tag name - * is valid. - * Extensions should NOT use this function; they can use the ListDefinedTags - * hook instead. - * - * @param string $tag Tag to create - * @since 1.25 - */ - public static function defineTag( $tag ) { - $dbw = wfGetDB( DB_MASTER ); - $dbw->replace( 'valid_tag', - array( 'vt_tag' ), - array( 'vt_tag' => $tag ), - __METHOD__ ); - - // clear the memcache of defined tags - self::purgeTagCacheAll(); - } - - /** - * Removes a tag from the valid_tag table. The tag may remain in use by - * extensions, and may still show up as 'defined' if an extension is setting - * it from the ListDefinedTags hook. - * - * @param string $tag Tag to remove - * @since 1.25 - */ - public static function undefineTag( $tag ) { - $dbw = wfGetDB( DB_MASTER ); - $dbw->delete( 'valid_tag', array( 'vt_tag' => $tag ), __METHOD__ ); - - // clear the memcache of defined tags - self::purgeTagCacheAll(); - } - - /** - * Writes a tag action into the tag management log. - * - * @param string $action - * @param string $tag - * @param string $reason - * @param User $user Who to attribute the action to - * @param int $tagCount For deletion only, how many usages the tag had before - * it was deleted. - * @since 1.25 - */ - protected static function logTagManagementAction( $action, $tag, $reason, - User $user, $tagCount = null ) { - - $dbw = wfGetDB( DB_MASTER ); - - $logEntry = new ManualLogEntry( 'managetags', $action ); - $logEntry->setPerformer( $user ); - // target page is not relevant, but it has to be set, so we just put in - // the title of Special:Tags - $logEntry->setTarget( Title::newFromText( 'Special:Tags' ) ); - $logEntry->setComment( $reason ); - - $params = array( '4::tag' => $tag ); - if ( !is_null( $tagCount ) ) { - $params['5:number:count'] = $tagCount; - } - $logEntry->setParameters( $params ); - $logEntry->setRelations( array( 'Tag' => $tag ) ); - - $logId = $logEntry->insert( $dbw ); - $logEntry->publish( $logId ); - return $logId; - } - - /** - * Is it OK to allow the user to activate this tag? - * - * @param string $tag Tag that you are interested in activating - * @param User|null $user User whose permission you wish to check, or null if - * you don't care (e.g. maintenance scripts) - * @return Status - * @since 1.25 - */ - public static function canActivateTag( $tag, User $user = null ) { - if ( !is_null( $user ) && !$user->isAllowed( 'managechangetags' ) ) { - return Status::newFatal( 'tags-manage-no-permission' ); - } - - // non-existing tags cannot be activated - $tagUsage = self::tagUsageStatistics(); - if ( !isset( $tagUsage[$tag] ) ) { - return Status::newFatal( 'tags-activate-not-found', $tag ); - } - - // defined tags cannot be activated (a defined tag is either extension- - // defined, in which case the extension chooses whether or not to active it; - // or user-defined, in which case it is considered active) - $definedTags = self::listDefinedTags(); - if ( in_array( $tag, $definedTags ) ) { - return Status::newFatal( 'tags-activate-not-allowed', $tag ); - } - - return Status::newGood(); - } - - /** - * Activates a tag, checking whether it is allowed first, and adding a log - * entry afterwards. - * - * Includes a call to ChangeTag::canActivateTag(), so your code doesn't need - * to do that. - * - * @param string $tag - * @param string $reason - * @param User $user Who to give credit for the action - * @param bool $ignoreWarnings Can be used for API interaction, default false - * @return Status If successful, the Status contains the ID of the added log - * entry as its value - * @since 1.25 - */ - public static function activateTagWithChecks( $tag, $reason, User $user, - $ignoreWarnings = false ) { - - // are we allowed to do this? - $result = self::canActivateTag( $tag, $user ); - if ( $ignoreWarnings ? !$result->isOK() : !$result->isGood() ) { - $result->value = null; - return $result; - } - - // do it! - self::defineTag( $tag ); - - // log it - $logId = self::logTagManagementAction( 'activate', $tag, $reason, $user ); - return Status::newGood( $logId ); - } - - /** - * Is it OK to allow the user to deactivate this tag? - * - * @param string $tag Tag that you are interested in deactivating - * @param User|null $user User whose permission you wish to check, or null if - * you don't care (e.g. maintenance scripts) - * @return Status - * @since 1.25 - */ - public static function canDeactivateTag( $tag, User $user = null ) { - if ( !is_null( $user ) && !$user->isAllowed( 'managechangetags' ) ) { - return Status::newFatal( 'tags-manage-no-permission' ); - } - - // only explicitly-defined tags can be deactivated - $explicitlyDefinedTags = self::listExplicitlyDefinedTags(); - if ( !in_array( $tag, $explicitlyDefinedTags ) ) { - return Status::newFatal( 'tags-deactivate-not-allowed', $tag ); - } - return Status::newGood(); - } - - /** - * Deactivates a tag, checking whether it is allowed first, and adding a log - * entry afterwards. - * - * Includes a call to ChangeTag::canDeactivateTag(), so your code doesn't need - * to do that. - * - * @param string $tag - * @param string $reason - * @param User $user Who to give credit for the action - * @param bool $ignoreWarnings Can be used for API interaction, default false - * @return Status If successful, the Status contains the ID of the added log - * entry as its value - * @since 1.25 - */ - public static function deactivateTagWithChecks( $tag, $reason, User $user, - $ignoreWarnings = false ) { - - // are we allowed to do this? - $result = self::canDeactivateTag( $tag, $user ); - if ( $ignoreWarnings ? !$result->isOK() : !$result->isGood() ) { - $result->value = null; - return $result; - } - - // do it! - self::undefineTag( $tag ); - - // log it - $logId = self::logTagManagementAction( 'deactivate', $tag, $reason, $user ); - return Status::newGood( $logId ); - } - - /** - * Is it OK to allow the user to create this tag? - * - * @param string $tag Tag that you are interested in creating - * @param User|null $user User whose permission you wish to check, or null if - * you don't care (e.g. maintenance scripts) - * @return Status - * @since 1.25 - */ - public static function canCreateTag( $tag, User $user = null ) { - if ( !is_null( $user ) && !$user->isAllowed( 'managechangetags' ) ) { - return Status::newFatal( 'tags-manage-no-permission' ); - } - - // no empty tags - if ( $tag === '' ) { - return Status::newFatal( 'tags-create-no-name' ); - } - - // tags cannot contain commas (used as a delimiter in tag_summary table) or - // slashes (would break tag description messages in MediaWiki namespace) - if ( strpos( $tag, ',' ) !== false || strpos( $tag, '/' ) !== false ) { - return Status::newFatal( 'tags-create-invalid-chars' ); - } - - // could the MediaWiki namespace description messages be created? - $title = Title::makeTitleSafe( NS_MEDIAWIKI, "Tag-$tag-description" ); - if ( is_null( $title ) ) { - return Status::newFatal( 'tags-create-invalid-title-chars' ); - } - - // does the tag already exist? - $tagUsage = self::tagUsageStatistics(); - if ( isset( $tagUsage[$tag] ) ) { - return Status::newFatal( 'tags-create-already-exists', $tag ); - } - - // check with hooks - $canCreateResult = Status::newGood(); - Hooks::run( 'ChangeTagCanCreate', array( $tag, $user, &$canCreateResult ) ); - return $canCreateResult; - } - - /** - * Creates a tag by adding a row to the `valid_tag` table. - * - * Includes a call to ChangeTag::canDeleteTag(), so your code doesn't need to - * do that. - * - * @param string $tag - * @param string $reason - * @param User $user Who to give credit for the action - * @param bool $ignoreWarnings Can be used for API interaction, default false - * @return Status If successful, the Status contains the ID of the added log - * entry as its value - * @since 1.25 - */ - public static function createTagWithChecks( $tag, $reason, User $user, - $ignoreWarnings = false ) { - - // are we allowed to do this? - $result = self::canCreateTag( $tag, $user ); - if ( $ignoreWarnings ? !$result->isOK() : !$result->isGood() ) { - $result->value = null; - return $result; - } - - // do it! - self::defineTag( $tag ); - - // log it - $logId = self::logTagManagementAction( 'create', $tag, $reason, $user ); - return Status::newGood( $logId ); - } - - /** - * Permanently removes all traces of a tag from the DB. Good for removing - * misspelt or temporary tags. - * - * This function should be directly called by maintenance scripts only, never - * by user-facing code. See deleteTagWithChecks() for functionality that can - * safely be exposed to users. - * - * @param string $tag Tag to remove - * @return Status The returned status will be good unless a hook changed it - * @since 1.25 - */ - public static function deleteTagEverywhere( $tag ) { - $dbw = wfGetDB( DB_MASTER ); - $dbw->startAtomic( __METHOD__ ); - - // delete from valid_tag - self::undefineTag( $tag ); - - // find out which revisions use this tag, so we can delete from tag_summary - $result = $dbw->select( 'change_tag', - array( 'ct_rc_id', 'ct_log_id', 'ct_rev_id', 'ct_tag' ), - array( 'ct_tag' => $tag ), - __METHOD__ ); - foreach ( $result as $row ) { - // remove the tag from the relevant row of tag_summary - $tagsToAdd = array(); - $tagsToRemove = array( $tag ); - self::updateTagSummaryRow( $tagsToAdd, $tagsToRemove, $row->ct_rc_id, - $row->ct_rev_id, $row->ct_log_id ); - } - - // delete from change_tag - $dbw->delete( 'change_tag', array( 'ct_tag' => $tag ), __METHOD__ ); - - $dbw->endAtomic( __METHOD__ ); - - // give extensions a chance - $status = Status::newGood(); - Hooks::run( 'ChangeTagAfterDelete', array( $tag, &$status ) ); - // let's not allow error results, as the actual tag deletion succeeded - if ( !$status->isOK() ) { - wfDebug( 'ChangeTagAfterDelete error condition downgraded to warning' ); - $status->ok = true; - } - - // clear the memcache of defined tags - self::purgeTagCacheAll(); - - return $status; - } - - /** - * Is it OK to allow the user to delete this tag? - * - * @param string $tag Tag that you are interested in deleting - * @param User|null $user User whose permission you wish to check, or null if - * you don't care (e.g. maintenance scripts) - * @return Status - * @since 1.25 - */ - public static function canDeleteTag( $tag, User $user = null ) { - $tagUsage = self::tagUsageStatistics(); - - if ( !is_null( $user ) && !$user->isAllowed( 'managechangetags' ) ) { - return Status::newFatal( 'tags-manage-no-permission' ); - } - - if ( !isset( $tagUsage[$tag] ) ) { - return Status::newFatal( 'tags-delete-not-found', $tag ); - } - - if ( $tagUsage[$tag] > self::MAX_DELETE_USES ) { - return Status::newFatal( 'tags-delete-too-many-uses', $tag, self::MAX_DELETE_USES ); - } - - $extensionDefined = self::listExtensionDefinedTags(); - if ( in_array( $tag, $extensionDefined ) ) { - // extension-defined tags can't be deleted unless the extension - // specifically allows it - $status = Status::newFatal( 'tags-delete-not-allowed' ); - } else { - // user-defined tags are deletable unless otherwise specified - $status = Status::newGood(); - } - - Hooks::run( 'ChangeTagCanDelete', array( $tag, $user, &$status ) ); - return $status; - } - - /** - * Deletes a tag, checking whether it is allowed first, and adding a log entry - * afterwards. - * - * Includes a call to ChangeTag::canDeleteTag(), so your code doesn't need to - * do that. - * - * @param string $tag - * @param string $reason - * @param User $user Who to give credit for the action - * @param bool $ignoreWarnings Can be used for API interaction, default false - * @return Status If successful, the Status contains the ID of the added log - * entry as its value - * @since 1.25 - */ - public static function deleteTagWithChecks( $tag, $reason, User $user, - $ignoreWarnings = false ) { - - // are we allowed to do this? - $result = self::canDeleteTag( $tag, $user ); - if ( $ignoreWarnings ? !$result->isOK() : !$result->isGood() ) { - $result->value = null; - return $result; - } - - // store the tag usage statistics - $tagUsage = self::tagUsageStatistics(); - - // do it! - $deleteResult = self::deleteTagEverywhere( $tag ); - if ( !$deleteResult->isOK() ) { - return $deleteResult; - } - - // log it - $logId = self::logTagManagementAction( 'delete', $tag, $reason, $user, $tagUsage[$tag] ); - $deleteResult->value = $logId; - return $deleteResult; - } - - /** - * Lists those tags which extensions report as being "active". - * - * @return array - * @since 1.25 - */ - public static function listExtensionActivatedTags() { - // Caching... - global $wgMemc; - $key = wfMemcKey( 'active-tags' ); - $tags = $wgMemc->get( $key ); - if ( $tags ) { - return $tags; - } - - // ask extensions which tags they consider active - $extensionActive = array(); - Hooks::run( 'ChangeTagsListActive', array( &$extensionActive ) ); - - // Short-term caching. - $wgMemc->set( $key, $extensionActive, 300 ); - return $extensionActive; - } - - /** - * Basically lists defined tags which count even if they aren't applied to anything. - * It returns a union of the results of listExplicitlyDefinedTags() and - * listExtensionDefinedTags(). - * - * @return string[] Array of strings: tags - */ - public static function listDefinedTags() { - $tags1 = self::listExplicitlyDefinedTags(); - $tags2 = self::listExtensionDefinedTags(); - return array_values( array_unique( array_merge( $tags1, $tags2 ) ) ); - } - - /** - * Lists tags explicitly defined in the `valid_tag` table of the database. - * Tags in table 'change_tag' which are not in table 'valid_tag' are not - * included. - * - * Tries memcached first. - * - * @return string[] Array of strings: tags - * @since 1.25 - */ - public static function listExplicitlyDefinedTags() { - // Caching... - global $wgMemc; - $key = wfMemcKey( 'valid-tags-db' ); - $tags = $wgMemc->get( $key ); - if ( $tags ) { - return $tags; - } - - $emptyTags = array(); - - // Some DB stuff - $dbr = wfGetDB( DB_SLAVE ); - $res = $dbr->select( 'valid_tag', 'vt_tag', array(), __METHOD__ ); - foreach ( $res as $row ) { - $emptyTags[] = $row->vt_tag; - } - - $emptyTags = array_filter( array_unique( $emptyTags ) ); - - // Short-term caching. - $wgMemc->set( $key, $emptyTags, 300 ); - return $emptyTags; - } - - /** - * Lists tags defined by extensions using the ListDefinedTags hook. - * Extensions need only define those tags they deem to be in active use. - * - * Tries memcached first. - * - * @return string[] Array of strings: tags - * @since 1.25 - */ - public static function listExtensionDefinedTags() { - // Caching... - global $wgMemc; - $key = wfMemcKey( 'valid-tags-hook' ); - $tags = $wgMemc->get( $key ); - if ( $tags ) { - return $tags; - } - - $emptyTags = array(); - Hooks::run( 'ListDefinedTags', array( &$emptyTags ) ); - $emptyTags = array_filter( array_unique( $emptyTags ) ); - - // Short-term caching. - $wgMemc->set( $key, $emptyTags, 300 ); - return $emptyTags; - } - - /** - * Invalidates the short-term cache of defined tags used by the - * list*DefinedTags functions, as well as the tag statistics cache. - * @since 1.25 - */ - public static function purgeTagCacheAll() { - global $wgMemc; - $wgMemc->delete( wfMemcKey( 'active-tags' ) ); - $wgMemc->delete( wfMemcKey( 'valid-tags-db' ) ); - $wgMemc->delete( wfMemcKey( 'valid-tags-hook' ) ); - self::purgeTagUsageCache(); - } - - /** - * Invalidates the tag statistics cache only. - * @since 1.25 - */ - public static function purgeTagUsageCache() { - global $wgMemc; - $wgMemc->delete( wfMemcKey( 'change-tag-statistics' ) ); - } - - /** - * Returns a map of any tags used on the wiki to number of edits - * tagged with them, ordered descending by the hitcount. - * - * Keeps a short-term cache in memory, so calling this multiple times in the - * same request should be fine. - * - * @return array Array of string => int - */ - public static function tagUsageStatistics() { - // Caching... - global $wgMemc; - $key = wfMemcKey( 'change-tag-statistics' ); - $stats = $wgMemc->get( $key ); - if ( $stats ) { - return $stats; - } - - $out = array(); - - $dbr = wfGetDB( DB_SLAVE, 'vslow' ); - $res = $dbr->select( - 'change_tag', - array( 'ct_tag', 'hitcount' => 'count(*)' ), - array(), - __METHOD__, - array( 'GROUP BY' => 'ct_tag', 'ORDER BY' => 'hitcount DESC' ) - ); - - foreach ( $res as $row ) { - $out[$row->ct_tag] = $row->hitcount; - } - foreach ( self::listDefinedTags() as $tag ) { - if ( !isset( $out[$tag] ) ) { - $out[$tag] = 0; - } - } - - // Cache for a very short time - $wgMemc->set( $key, $out, 300 ); - return $out; - } -} diff --git a/includes/changetags/ChangeTags.php b/includes/changetags/ChangeTags.php new file mode 100644 index 0000000000..43f957ce44 --- /dev/null +++ b/includes/changetags/ChangeTags.php @@ -0,0 +1,1222 @@ + 'mw-tag-marker ' . + Sanitizer::escapeClass( "mw-tag-marker-$tag" ) ), + $description + ); + $classes[] = Sanitizer::escapeClass( "mw-tag-$tag" ); + } + + if ( !$displayTags ) { + return array( '', array() ); + } + + $markers = wfMessage( 'tag-list-wrapper' ) + ->numParams( count( $displayTags ) ) + ->rawParams( $wgLang->commaList( $displayTags ) ) + ->parse(); + $markers = Xml::tags( 'span', array( 'class' => 'mw-tag-markers' ), $markers ); + + return array( $markers, $classes ); + } + + /** + * Get a short description for a tag. + * + * Checks if message key "mediawiki:tag-$tag" exists. If it does not, + * returns the HTML-escaped tag name. Uses the message if the message + * exists, provided it is not disabled. If the message is disabled, + * we consider the tag hidden, and return false. + * + * @param string $tag Tag + * @return string|bool Tag description or false if tag is to be hidden. + * @since 1.25 Returns false if tag is to be hidden. + */ + public static function tagDescription( $tag ) { + $msg = wfMessage( "tag-$tag" ); + if ( !$msg->exists() ) { + // No such message, so return the HTML-escaped tag name. + return htmlspecialchars( $tag ); + } + if ( $msg->isDisabled() ) { + // The message exists but is disabled, hide the tag. + return false; + } + + // Message exists and isn't disabled, use it. + return $msg->parse(); + } + + /** + * Add tags to a change given its rc_id, rev_id and/or log_id + * + * @param string|array $tags Tags to add to the change + * @param int|null $rc_id The rc_id of the change to add the tags to + * @param int|null $rev_id The rev_id of the change to add the tags to + * @param int|null $log_id The log_id of the change to add the tags to + * @param string $params Params to put in the ct_params field of table 'change_tag' + * + * @throws MWException + * @return bool False if no changes are made, otherwise true + */ + public static function addTags( $tags, $rc_id = null, $rev_id = null, + $log_id = null, $params = null + ) { + $result = self::updateTags( $tags, null, $rc_id, $rev_id, $log_id, $params ); + return (bool)$result[0]; + } + + /** + * Add and remove tags to/from a change given its rc_id, rev_id and/or log_id, + * without verifying that the tags exist or are valid. If a tag is present in + * both $tagsToAdd and $tagsToRemove, it will be removed. + * + * This function should only be used by extensions to manipulate tags they + * have registered using the ListDefinedTags hook. When dealing with user + * input, call updateTagsWithChecks() instead. + * + * @param string|array|null $tagsToAdd Tags to add to the change + * @param string|array|null $tagsToRemove Tags to remove from the change + * @param int|null &$rc_id The rc_id of the change to add the tags to. + * Pass a variable whose value is null if the rc_id is not relevant or unknown. + * @param int|null &$rev_id The rev_id of the change to add the tags to. + * Pass a variable whose value is null if the rev_id is not relevant or unknown. + * @param int|null &$log_id The log_id of the change to add the tags to. + * Pass a variable whose value is null if the log_id is not relevant or unknown. + * @param string $params Params to put in the ct_params field of table + * 'change_tag' when adding tags + * + * @throws MWException When $rc_id, $rev_id and $log_id are all null + * @return array Index 0 is an array of tags actually added, index 1 is an + * array of tags actually removed, index 2 is an array of tags present on the + * revision or log entry before any changes were made + * + * @since 1.25 + */ + public static function updateTags( $tagsToAdd, $tagsToRemove, &$rc_id = null, + &$rev_id = null, &$log_id = null, $params = null ) { + + $tagsToAdd = array_filter( (array)$tagsToAdd ); // Make sure we're submitting all tags... + $tagsToRemove = array_filter( (array)$tagsToRemove ); + + if ( !$rc_id && !$rev_id && !$log_id ) { + throw new MWException( 'At least one of: RCID, revision ID, and log ID MUST be ' . + 'specified when adding or removing a tag from a change!' ); + } + + $dbw = wfGetDB( DB_MASTER ); + + // Might as well look for rcids and so on. + if ( !$rc_id ) { + // Info might be out of date, somewhat fractionally, on slave. + if ( $log_id ) { + $rc_id = $dbw->selectField( + 'recentchanges', + 'rc_id', + array( 'rc_logid' => $log_id ), + __METHOD__ + ); + } elseif ( $rev_id ) { + $rc_id = $dbw->selectField( + 'recentchanges', + 'rc_id', + array( 'rc_this_oldid' => $rev_id ), + __METHOD__ + ); + } + } elseif ( !$log_id && !$rev_id ) { + // Info might be out of date, somewhat fractionally, on slave. + $log_id = $dbw->selectField( + 'recentchanges', + 'rc_logid', + array( 'rc_id' => $rc_id ), + __METHOD__ + ); + $rev_id = $dbw->selectField( + 'recentchanges', + 'rc_this_oldid', + array( 'rc_id' => $rc_id ), + __METHOD__ + ); + } + + // update the tag_summary row + $prevTags = array(); + if ( !self::updateTagSummaryRow( $tagsToAdd, $tagsToRemove, $rc_id, $rev_id, + $log_id, $prevTags ) ) { + + // nothing to do + return array( array(), array(), $prevTags ); + } + + // insert a row into change_tag for each new tag + if ( count( $tagsToAdd ) ) { + $tagsRows = array(); + foreach ( $tagsToAdd as $tag ) { + // Filter so we don't insert NULLs as zero accidentally. + // Keep in mind that $rc_id === null means "I don't care/know about the + // rc_id, just delete $tag on this revision/log entry". It doesn't + // mean "only delete tags on this revision/log WHERE rc_id IS NULL". + $tagsRows[] = array_filter( + array( + 'ct_tag' => $tag, + 'ct_rc_id' => $rc_id, + 'ct_log_id' => $log_id, + 'ct_rev_id' => $rev_id, + 'ct_params' => $params + ) + ); + } + + $dbw->insert( 'change_tag', $tagsRows, __METHOD__, array( 'IGNORE' ) ); + } + + // delete from change_tag + if ( count( $tagsToRemove ) ) { + foreach ( $tagsToRemove as $tag ) { + $conds = array_filter( + array( + 'ct_tag' => $tag, + 'ct_rc_id' => $rc_id, + 'ct_log_id' => $log_id, + 'ct_rev_id' => $rev_id + ) + ); + $dbw->delete( 'change_tag', $conds, __METHOD__ ); + } + } + + self::purgeTagUsageCache(); + return array( $tagsToAdd, $tagsToRemove, $prevTags ); + } + + /** + * Adds or removes a given set of tags to/from the relevant row of the + * tag_summary table. Modifies the tagsToAdd and tagsToRemove arrays to + * reflect the tags that were actually added and/or removed. + * + * @param array &$tagsToAdd + * @param array &$tagsToRemove If a tag is present in both $tagsToAdd and + * $tagsToRemove, it will be removed + * @param int|null $rc_id Null if not known or not applicable + * @param int|null $rev_id Null if not known or not applicable + * @param int|null $log_id Null if not known or not applicable + * @param array &$prevTags Optionally outputs a list of the tags that were + * in the tag_summary row to begin with + * @return bool True if any modifications were made, otherwise false + * @since 1.25 + */ + protected static function updateTagSummaryRow( &$tagsToAdd, &$tagsToRemove, + $rc_id, $rev_id, $log_id, &$prevTags = array() ) { + + $dbw = wfGetDB( DB_MASTER ); + + $tsConds = array_filter( array( + 'ts_rc_id' => $rc_id, + 'ts_rev_id' => $rev_id, + 'ts_log_id' => $log_id + ) ); + + // Can't both add and remove a tag at the same time... + $tagsToAdd = array_diff( $tagsToAdd, $tagsToRemove ); + + // Update the summary row. + // $prevTags can be out of date on slaves, especially when addTags is called consecutively, + // causing loss of tags added recently in tag_summary table. + $prevTags = $dbw->selectField( 'tag_summary', 'ts_tags', $tsConds, __METHOD__ ); + $prevTags = $prevTags ? $prevTags : ''; + $prevTags = array_filter( explode( ',', $prevTags ) ); + + // add tags + $tagsToAdd = array_values( array_diff( $tagsToAdd, $prevTags ) ); + $newTags = array_unique( array_merge( $prevTags, $tagsToAdd ) ); + + // remove tags + $tagsToRemove = array_values( array_intersect( $tagsToRemove, $newTags ) ); + $newTags = array_values( array_diff( $newTags, $tagsToRemove ) ); + + sort( $prevTags ); + sort( $newTags ); + if ( $prevTags == $newTags ) { + // No change. + return false; + } + + if ( !$newTags ) { + // no tags left, so delete the row altogether + $dbw->delete( 'tag_summary', $tsConds, __METHOD__ ); + } else { + $dbw->replace( 'tag_summary', + array( 'ts_rev_id', 'ts_rc_id', 'ts_log_id' ), + array_filter( array_merge( $tsConds, array( 'ts_tags' => implode( ',', $newTags ) ) ) ), + __METHOD__ + ); + } + + return true; + } + + /** + * Helper function to generate a fatal status with a 'not-allowed' type error. + * + * @param string $msgOne Message key to use in the case of one tag + * @param string $msgMulti Message key to use in the case of more than one tag + * @param array $tags Restricted tags (passed as $1 into the message, count of + * $tags passed as $2) + * @return Status + * @since 1.25 + */ + protected static function restrictedTagError( $msgOne, $msgMulti, $tags ) { + $lang = RequestContext::getMain()->getLanguage(); + $count = count( $tags ); + return Status::newFatal( ( $count > 1 ) ? $msgMulti : $msgOne, + $lang->commaList( $tags ), $count ); + } + + /** + * Is it OK to allow the user to apply all the specified tags at the same time + * as they edit/make the change? + * + * @param array $tags Tags that you are interested in applying + * @param User|null $user User whose permission you wish to check, or null if + * you don't care (e.g. maintenance scripts) + * @return Status + * @since 1.25 + */ + public static function canAddTagsAccompanyingChange( array $tags, + User $user = null ) { + + if ( !is_null( $user ) && !$user->isAllowed( 'applychangetags' ) ) { + return Status::newFatal( 'tags-apply-no-permission' ); + } + + // to be applied, a tag has to be explicitly defined + // @todo Allow extensions to define tags that can be applied by users... + $allowedTags = self::listExplicitlyDefinedTags(); + $disallowedTags = array_diff( $tags, $allowedTags ); + if ( $disallowedTags ) { + return self::restrictedTagError( 'tags-apply-not-allowed-one', + 'tags-apply-not-allowed-multi', $disallowedTags ); + } + + return Status::newGood(); + } + + /** + * Adds tags to a given change, checking whether it is allowed first, but + * without adding a log entry. Useful for cases where the tag is being added + * along with the action that generated the change (e.g. tagging an edit as + * it is being made). + * + * Extensions should not use this function, unless directly handling a user + * request to add a particular tag. Normally, extensions should call + * ChangeTags::updateTags() instead. + * + * @param array $tags Tags to apply + * @param int|null $rc_id The rc_id of the change to add the tags to + * @param int|null $rev_id The rev_id of the change to add the tags to + * @param int|null $log_id The log_id of the change to add the tags to + * @param string $params Params to put in the ct_params field of table + * 'change_tag' when adding tags + * @param User $user Who to give credit for the action + * @return Status + * @since 1.25 + */ + public static function addTagsAccompanyingChangeWithChecks( array $tags, + $rc_id, $rev_id, $log_id, $params, User $user ) { + + // are we allowed to do this? + $result = self::canAddTagsAccompanyingChange( $tags, $user ); + if ( !$result->isOK() ) { + $result->value = null; + return $result; + } + + // do it! + self::addTags( $tagsToAdd, $rc_id, $rev_id, $log_id, $params ); + + return Status::newGood( true ); + } + + /** + * Is it OK to allow the user to adds and remove the given tags tags to/from a + * change? + * + * @param array $tagsToAdd Tags that you are interested in adding + * @param array $tagsToRemove Tags that you are interested in removing + * @param User|null $user User whose permission you wish to check, or null if + * you don't care (e.g. maintenance scripts) + * @return Status + * @since 1.25 + */ + public static function canUpdateTags( array $tagsToAdd, array $tagsToRemove, + User $user = null ) { + + if ( !is_null( $user ) && !$user->isAllowed( 'changetags' ) ) { + return Status::newFatal( 'tags-update-no-permission' ); + } + + // to be added, a tag has to be explicitly defined + // @todo Allow extensions to define tags that can be applied by users... + $explicitlyDefinedTags = self::listExplicitlyDefinedTags(); + $diff = array_diff( $tagsToAdd, $explicitlyDefinedTags ); + if ( $diff ) { + return self::restrictedTagError( 'tags-update-add-not-allowed-one', + 'tags-update-add-not-allowed-multi', $diff ); + } + + // to be removed, a tag has to be either explicitly defined or not defined + // at all + $definedTags = self::listDefinedTags(); + $diff = array_diff( $tagsToRemove, $explicitlyDefinedTags ); + if ( $diff ) { + $intersect = array_intersect( $diff, $definedTags ); + if ( $intersect ) { + return self::restrictedTagError( 'tags-update-remove-not-allowed-one', + 'tags-update-remove-not-allowed-multi', $intersect ); + } + } + + return Status::newGood(); + } + + /** + * Adds and/or removes tags to/from a given change, checking whether it is + * allowed first, and adding a log entry afterwards. + * + * Includes a call to ChangeTag::canUpdateTags(), so your code doesn't need + * to do that. However, it doesn't check whether the *_id parameters are a + * valid combination. That is up to you to enforce. See ApiTag::execute() for + * an example. + * + * @param array|null $tagsToAdd If none, pass array() or null + * @param array|null $tagsToRemove If none, pass array() or null + * @param int|null $rc_id The rc_id of the change to add the tags to + * @param int|null $rev_id The rev_id of the change to add the tags to + * @param int|null $log_id The log_id of the change to add the tags to + * @param string $params Params to put in the ct_params field of table + * 'change_tag' when adding tags + * @param string $reason Comment for the log + * @param User $user Who to give credit for the action + * @return Status If successful, the value of this Status object will be an + * object (stdClass) with the following fields: + * - logId: the ID of the added log entry, or null if no log entry was added + * (i.e. no operation was performed) + * - addedTags: an array containing the tags that were actually added + * - removedTags: an array containing the tags that were actually removed + * @since 1.25 + */ + public static function updateTagsWithChecks( $tagsToAdd, $tagsToRemove, + $rc_id, $rev_id, $log_id, $params, $reason, User $user ) { + + if ( is_null( $tagsToAdd ) ) { + $tagsToAdd = array(); + } + if ( is_null( $tagsToRemove ) ) { + $tagsToRemove = array(); + } + if ( !$tagsToAdd && !$tagsToRemove ) { + // no-op, don't bother + return Status::newGood( (object)array( + 'logId' => null, + 'addedTags' => array(), + 'removedTags' => array(), + ) ); + } + + // are we allowed to do this? + $result = self::canUpdateTags( $tagsToAdd, $tagsToRemove, $user ); + if ( !$result->isOK() ) { + $result->value = null; + return $result; + } + + // basic rate limiting + if ( $user->pingLimiter( 'changetag' ) ) { + return Status::newFatal( 'actionthrottledtext' ); + } + + // do it! + list( $tagsAdded, $tagsRemoved, $initialTags ) = self::updateTags( $tagsToAdd, + $tagsToRemove, $rc_id, $rev_id, $log_id, $params ); + if ( !$tagsAdded && !$tagsRemoved ) { + // no-op, don't log it + return Status::newGood( (object)array( + 'logId' => null, + 'addedTags' => array(), + 'removedTags' => array(), + ) ); + } + + // log it + $logEntry = new ManualLogEntry( 'tag', 'update' ); + $logEntry->setPerformer( $user ); + $logEntry->setComment( $reason ); + + // find the appropriate target page + if ( $rev_id ) { + $rev = Revision::newFromId( $rev_id ); + if ( $rev ) { + $title = $rev->getTitle(); + $logEntry->setTarget( $rev->getTitle() ); + } + } elseif ( $log_id ) { + // This function is from revision deletion logic and has nothing to do with + // change tags, but it appears to be the only other place in core where we + // perform logged actions on log items. + $logEntry->setTarget( RevDelLogList::suggestTarget( 0, array( $log_id ) ) ); + } + + if ( !$logEntry->getTarget() ) { + // target is required, so we have to set something + $logEntry->setTarget( SpecialPage::getTitleFor( 'Tags' ) ); + } + + $logParams = array( + '4::revid' => $rev_id, + '5::logid' => $log_id, + '6:list:tagsAdded' => $tagsAdded, + '7:number:tagsAddedCount' => count( $tagsAdded ), + '8:list:tagsRemoved' => $tagsRemoved, + '9:number:tagsRemovedCount' => count( $tagsRemoved ), + 'initialTags' => $initialTags, + ); + $logEntry->setParameters( $logParams ); + $logEntry->setRelations( array( 'Tag' => array_merge( $tagsAdded, $tagsRemoved ) ) ); + + $dbw = wfGetDB( DB_MASTER ); + $logId = $logEntry->insert( $dbw ); + // Only send this to UDP, not RC, similar to patrol events + $logEntry->publish( $logId, 'udp' ); + + return Status::newGood( (object)array( + 'logId' => $logId, + 'addedTags' => $tagsAdded, + 'removedTags' => $tagsRemoved, + ) ); + } + + /** + * Applies all tags-related changes to a query. + * Handles selecting tags, and filtering. + * Needs $tables to be set up properly, so we can figure out which join conditions to use. + * + * @param string|array $tables Table names, see DatabaseBase::select + * @param string|array $fields Fields used in query, see DatabaseBase::select + * @param string|array $conds Conditions used in query, see DatabaseBase::select + * @param array $join_conds Join conditions, see DatabaseBase::select + * @param array $options Options, see Database::select + * @param bool|string $filter_tag Tag to select on + * + * @throws MWException When unable to determine appropriate JOIN condition for tagging + */ + public static function modifyDisplayQuery( &$tables, &$fields, &$conds, + &$join_conds, &$options, $filter_tag = false ) { + global $wgRequest, $wgUseTagFilter; + + if ( $filter_tag === false ) { + $filter_tag = $wgRequest->getVal( 'tagfilter' ); + } + + // Figure out which conditions can be done. + if ( in_array( 'recentchanges', $tables ) ) { + $join_cond = 'ct_rc_id=rc_id'; + } elseif ( in_array( 'logging', $tables ) ) { + $join_cond = 'ct_log_id=log_id'; + } elseif ( in_array( 'revision', $tables ) ) { + $join_cond = 'ct_rev_id=rev_id'; + } elseif ( in_array( 'archive', $tables ) ) { + $join_cond = 'ct_rev_id=ar_rev_id'; + } else { + throw new MWException( 'Unable to determine appropriate JOIN condition for tagging.' ); + } + + $fields['ts_tags'] = wfGetDB( DB_SLAVE )->buildGroupConcatField( + ',', 'change_tag', 'ct_tag', $join_cond + ); + + if ( $wgUseTagFilter && $filter_tag ) { + // Somebody wants to filter on a tag. + // Add an INNER JOIN on change_tag + + $tables[] = 'change_tag'; + $join_conds['change_tag'] = array( 'INNER JOIN', $join_cond ); + $conds['ct_tag'] = $filter_tag; + } + } + + /** + * Build a text box to select a change tag + * + * @param string $selected Tag to select by default + * @param bool $fullForm + * - if false, then it returns an array of (label, form). + * - if true, it returns an entire form around the selector. + * @param Title $title Title object to send the form to. + * Used when, and only when $fullForm is true. + * @return string|array + * - if $fullForm is false: Array with + * - if $fullForm is true: String, html fragment + */ + public static function buildTagFilterSelector( $selected = '', + $fullForm = false, Title $title = null + ) { + global $wgUseTagFilter; + + if ( !$wgUseTagFilter || !count( self::listDefinedTags() ) ) { + return $fullForm ? '' : array(); + } + + $data = array( + Html::rawElement( + 'label', + array( 'for' => 'tagfilter' ), + wfMessage( 'tag-filter' )->parse() + ), + Xml::input( + 'tagfilter', + 20, + $selected, + array( 'class' => 'mw-tagfilter-input mw-ui-input mw-ui-input-inline', 'id' => 'tagfilter' ) + ) + ); + + if ( !$fullForm ) { + return $data; + } + + $html = implode( ' ', $data ); + $html .= "\n" . + Xml::element( + 'input', + array( 'type' => 'submit', 'value' => wfMessage( 'tag-filter-submit' )->text() ) + ); + $html .= "\n" . Html::hidden( 'title', $title->getPrefixedText() ); + $html = Xml::tags( + 'form', + array( 'action' => $title->getLocalURL(), 'class' => 'mw-tagfilter-form', 'method' => 'get' ), + $html + ); + + return $html; + } + + /** + * Defines a tag in the valid_tag table, without checking that the tag name + * is valid. + * Extensions should NOT use this function; they can use the ListDefinedTags + * hook instead. + * + * @param string $tag Tag to create + * @since 1.25 + */ + public static function defineTag( $tag ) { + $dbw = wfGetDB( DB_MASTER ); + $dbw->replace( 'valid_tag', + array( 'vt_tag' ), + array( 'vt_tag' => $tag ), + __METHOD__ ); + + // clear the memcache of defined tags + self::purgeTagCacheAll(); + } + + /** + * Removes a tag from the valid_tag table. The tag may remain in use by + * extensions, and may still show up as 'defined' if an extension is setting + * it from the ListDefinedTags hook. + * + * @param string $tag Tag to remove + * @since 1.25 + */ + public static function undefineTag( $tag ) { + $dbw = wfGetDB( DB_MASTER ); + $dbw->delete( 'valid_tag', array( 'vt_tag' => $tag ), __METHOD__ ); + + // clear the memcache of defined tags + self::purgeTagCacheAll(); + } + + /** + * Writes a tag action into the tag management log. + * + * @param string $action + * @param string $tag + * @param string $reason + * @param User $user Who to attribute the action to + * @param int $tagCount For deletion only, how many usages the tag had before + * it was deleted. + * @since 1.25 + */ + protected static function logTagManagementAction( $action, $tag, $reason, + User $user, $tagCount = null ) { + + $dbw = wfGetDB( DB_MASTER ); + + $logEntry = new ManualLogEntry( 'managetags', $action ); + $logEntry->setPerformer( $user ); + // target page is not relevant, but it has to be set, so we just put in + // the title of Special:Tags + $logEntry->setTarget( Title::newFromText( 'Special:Tags' ) ); + $logEntry->setComment( $reason ); + + $params = array( '4::tag' => $tag ); + if ( !is_null( $tagCount ) ) { + $params['5:number:count'] = $tagCount; + } + $logEntry->setParameters( $params ); + $logEntry->setRelations( array( 'Tag' => $tag ) ); + + $logId = $logEntry->insert( $dbw ); + $logEntry->publish( $logId ); + return $logId; + } + + /** + * Is it OK to allow the user to activate this tag? + * + * @param string $tag Tag that you are interested in activating + * @param User|null $user User whose permission you wish to check, or null if + * you don't care (e.g. maintenance scripts) + * @return Status + * @since 1.25 + */ + public static function canActivateTag( $tag, User $user = null ) { + if ( !is_null( $user ) && !$user->isAllowed( 'managechangetags' ) ) { + return Status::newFatal( 'tags-manage-no-permission' ); + } + + // non-existing tags cannot be activated + $tagUsage = self::tagUsageStatistics(); + if ( !isset( $tagUsage[$tag] ) ) { + return Status::newFatal( 'tags-activate-not-found', $tag ); + } + + // defined tags cannot be activated (a defined tag is either extension- + // defined, in which case the extension chooses whether or not to active it; + // or user-defined, in which case it is considered active) + $definedTags = self::listDefinedTags(); + if ( in_array( $tag, $definedTags ) ) { + return Status::newFatal( 'tags-activate-not-allowed', $tag ); + } + + return Status::newGood(); + } + + /** + * Activates a tag, checking whether it is allowed first, and adding a log + * entry afterwards. + * + * Includes a call to ChangeTag::canActivateTag(), so your code doesn't need + * to do that. + * + * @param string $tag + * @param string $reason + * @param User $user Who to give credit for the action + * @param bool $ignoreWarnings Can be used for API interaction, default false + * @return Status If successful, the Status contains the ID of the added log + * entry as its value + * @since 1.25 + */ + public static function activateTagWithChecks( $tag, $reason, User $user, + $ignoreWarnings = false ) { + + // are we allowed to do this? + $result = self::canActivateTag( $tag, $user ); + if ( $ignoreWarnings ? !$result->isOK() : !$result->isGood() ) { + $result->value = null; + return $result; + } + + // do it! + self::defineTag( $tag ); + + // log it + $logId = self::logTagManagementAction( 'activate', $tag, $reason, $user ); + return Status::newGood( $logId ); + } + + /** + * Is it OK to allow the user to deactivate this tag? + * + * @param string $tag Tag that you are interested in deactivating + * @param User|null $user User whose permission you wish to check, or null if + * you don't care (e.g. maintenance scripts) + * @return Status + * @since 1.25 + */ + public static function canDeactivateTag( $tag, User $user = null ) { + if ( !is_null( $user ) && !$user->isAllowed( 'managechangetags' ) ) { + return Status::newFatal( 'tags-manage-no-permission' ); + } + + // only explicitly-defined tags can be deactivated + $explicitlyDefinedTags = self::listExplicitlyDefinedTags(); + if ( !in_array( $tag, $explicitlyDefinedTags ) ) { + return Status::newFatal( 'tags-deactivate-not-allowed', $tag ); + } + return Status::newGood(); + } + + /** + * Deactivates a tag, checking whether it is allowed first, and adding a log + * entry afterwards. + * + * Includes a call to ChangeTag::canDeactivateTag(), so your code doesn't need + * to do that. + * + * @param string $tag + * @param string $reason + * @param User $user Who to give credit for the action + * @param bool $ignoreWarnings Can be used for API interaction, default false + * @return Status If successful, the Status contains the ID of the added log + * entry as its value + * @since 1.25 + */ + public static function deactivateTagWithChecks( $tag, $reason, User $user, + $ignoreWarnings = false ) { + + // are we allowed to do this? + $result = self::canDeactivateTag( $tag, $user ); + if ( $ignoreWarnings ? !$result->isOK() : !$result->isGood() ) { + $result->value = null; + return $result; + } + + // do it! + self::undefineTag( $tag ); + + // log it + $logId = self::logTagManagementAction( 'deactivate', $tag, $reason, $user ); + return Status::newGood( $logId ); + } + + /** + * Is it OK to allow the user to create this tag? + * + * @param string $tag Tag that you are interested in creating + * @param User|null $user User whose permission you wish to check, or null if + * you don't care (e.g. maintenance scripts) + * @return Status + * @since 1.25 + */ + public static function canCreateTag( $tag, User $user = null ) { + if ( !is_null( $user ) && !$user->isAllowed( 'managechangetags' ) ) { + return Status::newFatal( 'tags-manage-no-permission' ); + } + + // no empty tags + if ( $tag === '' ) { + return Status::newFatal( 'tags-create-no-name' ); + } + + // tags cannot contain commas (used as a delimiter in tag_summary table) or + // slashes (would break tag description messages in MediaWiki namespace) + if ( strpos( $tag, ',' ) !== false || strpos( $tag, '/' ) !== false ) { + return Status::newFatal( 'tags-create-invalid-chars' ); + } + + // could the MediaWiki namespace description messages be created? + $title = Title::makeTitleSafe( NS_MEDIAWIKI, "Tag-$tag-description" ); + if ( is_null( $title ) ) { + return Status::newFatal( 'tags-create-invalid-title-chars' ); + } + + // does the tag already exist? + $tagUsage = self::tagUsageStatistics(); + if ( isset( $tagUsage[$tag] ) ) { + return Status::newFatal( 'tags-create-already-exists', $tag ); + } + + // check with hooks + $canCreateResult = Status::newGood(); + Hooks::run( 'ChangeTagCanCreate', array( $tag, $user, &$canCreateResult ) ); + return $canCreateResult; + } + + /** + * Creates a tag by adding a row to the `valid_tag` table. + * + * Includes a call to ChangeTag::canDeleteTag(), so your code doesn't need to + * do that. + * + * @param string $tag + * @param string $reason + * @param User $user Who to give credit for the action + * @param bool $ignoreWarnings Can be used for API interaction, default false + * @return Status If successful, the Status contains the ID of the added log + * entry as its value + * @since 1.25 + */ + public static function createTagWithChecks( $tag, $reason, User $user, + $ignoreWarnings = false ) { + + // are we allowed to do this? + $result = self::canCreateTag( $tag, $user ); + if ( $ignoreWarnings ? !$result->isOK() : !$result->isGood() ) { + $result->value = null; + return $result; + } + + // do it! + self::defineTag( $tag ); + + // log it + $logId = self::logTagManagementAction( 'create', $tag, $reason, $user ); + return Status::newGood( $logId ); + } + + /** + * Permanently removes all traces of a tag from the DB. Good for removing + * misspelt or temporary tags. + * + * This function should be directly called by maintenance scripts only, never + * by user-facing code. See deleteTagWithChecks() for functionality that can + * safely be exposed to users. + * + * @param string $tag Tag to remove + * @return Status The returned status will be good unless a hook changed it + * @since 1.25 + */ + public static function deleteTagEverywhere( $tag ) { + $dbw = wfGetDB( DB_MASTER ); + $dbw->startAtomic( __METHOD__ ); + + // delete from valid_tag + self::undefineTag( $tag ); + + // find out which revisions use this tag, so we can delete from tag_summary + $result = $dbw->select( 'change_tag', + array( 'ct_rc_id', 'ct_log_id', 'ct_rev_id', 'ct_tag' ), + array( 'ct_tag' => $tag ), + __METHOD__ ); + foreach ( $result as $row ) { + // remove the tag from the relevant row of tag_summary + $tagsToAdd = array(); + $tagsToRemove = array( $tag ); + self::updateTagSummaryRow( $tagsToAdd, $tagsToRemove, $row->ct_rc_id, + $row->ct_rev_id, $row->ct_log_id ); + } + + // delete from change_tag + $dbw->delete( 'change_tag', array( 'ct_tag' => $tag ), __METHOD__ ); + + $dbw->endAtomic( __METHOD__ ); + + // give extensions a chance + $status = Status::newGood(); + Hooks::run( 'ChangeTagAfterDelete', array( $tag, &$status ) ); + // let's not allow error results, as the actual tag deletion succeeded + if ( !$status->isOK() ) { + wfDebug( 'ChangeTagAfterDelete error condition downgraded to warning' ); + $status->ok = true; + } + + // clear the memcache of defined tags + self::purgeTagCacheAll(); + + return $status; + } + + /** + * Is it OK to allow the user to delete this tag? + * + * @param string $tag Tag that you are interested in deleting + * @param User|null $user User whose permission you wish to check, or null if + * you don't care (e.g. maintenance scripts) + * @return Status + * @since 1.25 + */ + public static function canDeleteTag( $tag, User $user = null ) { + $tagUsage = self::tagUsageStatistics(); + + if ( !is_null( $user ) && !$user->isAllowed( 'managechangetags' ) ) { + return Status::newFatal( 'tags-manage-no-permission' ); + } + + if ( !isset( $tagUsage[$tag] ) ) { + return Status::newFatal( 'tags-delete-not-found', $tag ); + } + + if ( $tagUsage[$tag] > self::MAX_DELETE_USES ) { + return Status::newFatal( 'tags-delete-too-many-uses', $tag, self::MAX_DELETE_USES ); + } + + $extensionDefined = self::listExtensionDefinedTags(); + if ( in_array( $tag, $extensionDefined ) ) { + // extension-defined tags can't be deleted unless the extension + // specifically allows it + $status = Status::newFatal( 'tags-delete-not-allowed' ); + } else { + // user-defined tags are deletable unless otherwise specified + $status = Status::newGood(); + } + + Hooks::run( 'ChangeTagCanDelete', array( $tag, $user, &$status ) ); + return $status; + } + + /** + * Deletes a tag, checking whether it is allowed first, and adding a log entry + * afterwards. + * + * Includes a call to ChangeTag::canDeleteTag(), so your code doesn't need to + * do that. + * + * @param string $tag + * @param string $reason + * @param User $user Who to give credit for the action + * @param bool $ignoreWarnings Can be used for API interaction, default false + * @return Status If successful, the Status contains the ID of the added log + * entry as its value + * @since 1.25 + */ + public static function deleteTagWithChecks( $tag, $reason, User $user, + $ignoreWarnings = false ) { + + // are we allowed to do this? + $result = self::canDeleteTag( $tag, $user ); + if ( $ignoreWarnings ? !$result->isOK() : !$result->isGood() ) { + $result->value = null; + return $result; + } + + // store the tag usage statistics + $tagUsage = self::tagUsageStatistics(); + + // do it! + $deleteResult = self::deleteTagEverywhere( $tag ); + if ( !$deleteResult->isOK() ) { + return $deleteResult; + } + + // log it + $logId = self::logTagManagementAction( 'delete', $tag, $reason, $user, $tagUsage[$tag] ); + $deleteResult->value = $logId; + return $deleteResult; + } + + /** + * Lists those tags which extensions report as being "active". + * + * @return array + * @since 1.25 + */ + public static function listExtensionActivatedTags() { + // Caching... + global $wgMemc; + $key = wfMemcKey( 'active-tags' ); + $tags = $wgMemc->get( $key ); + if ( $tags ) { + return $tags; + } + + // ask extensions which tags they consider active + $extensionActive = array(); + Hooks::run( 'ChangeTagsListActive', array( &$extensionActive ) ); + + // Short-term caching. + $wgMemc->set( $key, $extensionActive, 300 ); + return $extensionActive; + } + + /** + * Basically lists defined tags which count even if they aren't applied to anything. + * It returns a union of the results of listExplicitlyDefinedTags() and + * listExtensionDefinedTags(). + * + * @return string[] Array of strings: tags + */ + public static function listDefinedTags() { + $tags1 = self::listExplicitlyDefinedTags(); + $tags2 = self::listExtensionDefinedTags(); + return array_values( array_unique( array_merge( $tags1, $tags2 ) ) ); + } + + /** + * Lists tags explicitly defined in the `valid_tag` table of the database. + * Tags in table 'change_tag' which are not in table 'valid_tag' are not + * included. + * + * Tries memcached first. + * + * @return string[] Array of strings: tags + * @since 1.25 + */ + public static function listExplicitlyDefinedTags() { + // Caching... + global $wgMemc; + $key = wfMemcKey( 'valid-tags-db' ); + $tags = $wgMemc->get( $key ); + if ( $tags ) { + return $tags; + } + + $emptyTags = array(); + + // Some DB stuff + $dbr = wfGetDB( DB_SLAVE ); + $res = $dbr->select( 'valid_tag', 'vt_tag', array(), __METHOD__ ); + foreach ( $res as $row ) { + $emptyTags[] = $row->vt_tag; + } + + $emptyTags = array_filter( array_unique( $emptyTags ) ); + + // Short-term caching. + $wgMemc->set( $key, $emptyTags, 300 ); + return $emptyTags; + } + + /** + * Lists tags defined by extensions using the ListDefinedTags hook. + * Extensions need only define those tags they deem to be in active use. + * + * Tries memcached first. + * + * @return string[] Array of strings: tags + * @since 1.25 + */ + public static function listExtensionDefinedTags() { + // Caching... + global $wgMemc; + $key = wfMemcKey( 'valid-tags-hook' ); + $tags = $wgMemc->get( $key ); + if ( $tags ) { + return $tags; + } + + $emptyTags = array(); + Hooks::run( 'ListDefinedTags', array( &$emptyTags ) ); + $emptyTags = array_filter( array_unique( $emptyTags ) ); + + // Short-term caching. + $wgMemc->set( $key, $emptyTags, 300 ); + return $emptyTags; + } + + /** + * Invalidates the short-term cache of defined tags used by the + * list*DefinedTags functions, as well as the tag statistics cache. + * @since 1.25 + */ + public static function purgeTagCacheAll() { + global $wgMemc; + $wgMemc->delete( wfMemcKey( 'active-tags' ) ); + $wgMemc->delete( wfMemcKey( 'valid-tags-db' ) ); + $wgMemc->delete( wfMemcKey( 'valid-tags-hook' ) ); + self::purgeTagUsageCache(); + } + + /** + * Invalidates the tag statistics cache only. + * @since 1.25 + */ + public static function purgeTagUsageCache() { + global $wgMemc; + $wgMemc->delete( wfMemcKey( 'change-tag-statistics' ) ); + } + + /** + * Returns a map of any tags used on the wiki to number of edits + * tagged with them, ordered descending by the hitcount. + * + * Keeps a short-term cache in memory, so calling this multiple times in the + * same request should be fine. + * + * @return array Array of string => int + */ + public static function tagUsageStatistics() { + // Caching... + global $wgMemc; + $key = wfMemcKey( 'change-tag-statistics' ); + $stats = $wgMemc->get( $key ); + if ( $stats ) { + return $stats; + } + + $out = array(); + + $dbr = wfGetDB( DB_SLAVE, 'vslow' ); + $res = $dbr->select( + 'change_tag', + array( 'ct_tag', 'hitcount' => 'count(*)' ), + array(), + __METHOD__, + array( 'GROUP BY' => 'ct_tag', 'ORDER BY' => 'hitcount DESC' ) + ); + + foreach ( $res as $row ) { + $out[$row->ct_tag] = $row->hitcount; + } + foreach ( self::listDefinedTags() as $tag ) { + if ( !isset( $out[$tag] ) ) { + $out[$tag] = 0; + } + } + + // Cache for a very short time + $wgMemc->set( $key, $out, 300 ); + return $out; + } +}