ApiOpenSearchFormatJson.php

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<?php
class ApiOpenSearchFormatJson extends ApiFormatJson {
    private $warningsAsError;
 
    public function __construct( ApiMain $main, $fm, $warningsAsError ) {
        parent::__construct( $main, "json$fm" );
        $this->warningsAsError = $warningsAsError;
    }
 
    public function execute() {
        $result = $this->getResult();
        if ( !$result->getResultData( 'error' ) && !$result->getResultData( 'errors' ) ) {
            // Ignore warnings or treat as errors, as requested
            $warnings = $result->removeValue( 'warnings', null );
            if ( $this->warningsAsError && $warnings ) {
                $this->dieWithError(
                    'apierror-opensearch-json-warnings',
                    'warnings',
                    [ 'warnings' => $warnings ]
                );
            }
 
            // Ignore any other unexpected keys (e.g. from $wgDebugToolbar)
            $remove = array_keys( array_diff_key(
                $result->getResultData(),
                [ 0 => 'search', 1 => 'terms', 2 => 'descriptions', 3 => 'urls' ]
            ) );
            foreach ( $remove as $key ) {
                $result->removeValue( $key, null );
            }
        }
 
        parent::execute();
    }
}