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CNChoiceDataResourceLoaderModule.php
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CNChoiceDataResourceLoaderModule.php
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<?php
use MediaWiki\Config\ConfigException;
use MediaWiki\Html\Html;
use MediaWiki\Json\FormatJson;
use MediaWiki\MediaWikiServices;
use MediaWiki\ResourceLoader as RL;
/**
* ResourceLoader module for sending banner choices to the client.
*
* Note: This class has been intentionally left stateless, due to how
* ResourceLoader works. This class has no expectation of having getScript() or
* getModifiedHash() called in the same request.
*/
class CNChoiceDataResourceLoaderModule extends RL\Module {
private const API_REQUEST_TIMEOUT = 20;
/**
* @param RL\Context $context
* @return array
*/
protected function getChoices( RL\Context $context ) {
$config = $this->getConfig();
$project = $config->get( 'NoticeProject' );
$language = $context->getLanguage();
// Only fetch the data via the API if $wgCentralNoticeApiUrl is set.
// Otherwise, use the DB.
$apiUrl = $config->get( 'CentralNoticeApiUrl' );
if ( $apiUrl ) {
$choices = $this->getFromApi( $project, $language );
if ( !$choices ) {
wfLogWarning( 'Couldn\'t fetch banner choice data via API. ' .
'wgCentralNoticeApiUrl = ' . $apiUrl );
return [];
}
} else {
$choices = ChoiceDataProvider::getChoices( $project, $language );
}
return $choices;
}
/**
* Get the banner choices data via an API call to the infrastructure wiki.
* If the call fails, we return false.
*
* @param string $project
* @param string $language
*
* @return array|bool
*/
private function getFromApi( $project, $language ) {
$cnApiUrl = $this->getConfig()->get( 'CentralNoticeApiUrl' );
// Make the URL
$q = [
'action' => 'centralnoticechoicedata',
'project' => $project,
'language' => $language,
'format' => 'json',
// Prevents stripping of false values 8p
'formatversion' => 2
];
$url = wfAppendQuery( $cnApiUrl, $q );
$apiResult = MediaWikiServices::getInstance()->getHttpRequestFactory()->get(
$url,
[ 'timeout' => self::API_REQUEST_TIMEOUT * 0.8 ],
__METHOD__
);
if ( !$apiResult ) {
wfLogWarning( 'Couldn\'t get banner choice data via API.' );
return false;
}
$parsedApiResult = FormatJson::parse( $apiResult, FormatJson::FORCE_ASSOC );
if ( !$parsedApiResult->isGood() ) {
wfLogWarning( 'Couldn\'t parse banner choice data from API.' );
return false;
}
$result = $parsedApiResult->getValue();
if ( isset( $result['error'] ) ) {
wfLogWarning( 'Error fetching banner choice data via API: ' .
$result['error']['info'] . ': ' . $result['error']['code'] );
return false;
}
return $result['choices'];
}
/**
* @inheritDoc
*/
public function getScript( RL\Context $context ) {
$choices = $this->getChoices( $context );
if ( !$choices ) {
// If there are no choices, this module will have no dependencies,
// but other modules that create mw.centralNotice may be brought
// in elsewhere. Let's the check for its existence here, too, for
// robustness.
return 'mw.centralNotice = ( mw.centralNotice || {} );' .
'mw.centralNotice.choiceData = [];';
} else {
// If there are choices, this module should depend on (at least)
// ext.centralNotice.display, which will create mw.centralNotice.
// However, RL may experience errors that cause these dynamic
// dependencies to not be set as expected; so we check, just in case.
// In such an error state, ext.centralNotice.startUp.js logs to the
// console.
return 'mw.centralNotice = ( mw.centralNotice || {} );' .
'mw.centralNotice.choiceData = ' .
Html::encodeJsVar( $choices ) . ';';
}
}
/**
* @inheritDoc
*/
public function getDependencies( ?RL\Context $context = null ) {
$cnCampaignMixins = $this->getConfig()->get( 'CentralNoticeCampaignMixins' );
// If this method is called with no context argument (the old method
// signature) emit a warning, but don't stop the show.
if ( !$context ) {
wfLogWarning( '$context is required for campaign mixins.' );
return [];
}
// Get the choices (possible campaigns and banners) for this user
$choices = $this->getChoices( $context );
if ( !$choices ) {
// If there are no choices, no dependencies
return [];
}
// Run through the choices to get all needed mixin RL modules
$dependencies = [];
foreach ( $choices as $choice ) {
foreach ( $choice['mixins'] as $mixinName => $mixinParams ) {
if ( !$cnCampaignMixins[$mixinName]['subscribingModule'] ) {
throw new ConfigException(
"No subscribing module for found campaign mixin {$mixinName}" );
}
$dependencies[] =
$cnCampaignMixins[$mixinName]['subscribingModule'];
}
}
// The display module is needed to process choices
$dependencies[] = 'ext.centralNotice.display';
// Since campaigns targeting the user could have the same mixin RL
// modules, remove any duplicates.
return array_unique( $dependencies );
}
/**
* @inheritDoc
*/
public function getDefinitionSummary( RL\Context $context ) {
$summary = parent::getDefinitionSummary( $context );
$summary[] = [
'choices' => $this->getChoices( $context ),
];
return $summary;
}
}

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