ServiceOptions.php

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<?php

namespace MediaWiki\Config;

use Config;
use InvalidArgumentException;
use Wikimedia\Assert\Assert;

class ServiceOptions {
    private $keys = [];
    private $options = [];

    public function __construct( array $keys, ...$sources ) {
        $this->keys = $keys;
        foreach ( $keys as $key ) {
            foreach ( $sources as $source ) {
                if ( $source instanceof Config ) {
                    if ( $source->has( $key ) ) {
                        $this->options[$key] = $source->get( $key );
                        continue 2;
                    }
                } else {
                    if ( array_key_exists( $key, $source ) ) {
                        $this->options[$key] = $source[$key];
                        continue 2;
                    }
                }
            }
            throw new InvalidArgumentException( "Key \"$key\" not found in input sources" );
        }
    }

    public function assertRequiredOptions( array $expectedKeys ) {
        if ( $this->keys !== $expectedKeys ) {
            $extraKeys = array_diff( $this->keys, $expectedKeys );
            $missingKeys = array_diff( $expectedKeys, $this->keys );
            Assert::precondition( !$extraKeys && !$missingKeys,
                (
                $extraKeys
                    ? 'Unsupported options passed: ' . implode( ', ', $extraKeys ) . '!'
                    : ''
                ) . ( $extraKeys && $missingKeys ? ' ' : '' ) . (
                $missingKeys
                    ? 'Required options missing: ' . implode( ', ', $missingKeys ) . '!'
                    : ''
                )
            );
        }
    }

    public function get( $key ) {
        if ( !array_key_exists( $key, $this->options ) ) {
            throw new InvalidArgumentException( "Unrecognized option \"$key\"" );
        }
        return $this->options[$key];
    }
}