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1<?php
2
3namespace MediaWiki\Extension\AbuseFilter;
4
5use MediaWiki\Extension\AbuseFilter\Consequences\ConsequencesRegistry;
6use MediaWiki\Extension\AbuseFilter\Filter\Filter;
7
8/**
9 * This service allows comparing two versions of a filter.
10 * @todo We might want to expand this to cover the use case of ViewDiff
11 * @internal
12 */
13class FilterCompare {
14    public const SERVICE_NAME = 'AbuseFilterFilterCompare';
15
16    public function __construct( private readonly ConsequencesRegistry $consequencesRegistry ) {
17    }
18
19    /**
20     * @param Filter $firstFilter
21     * @param Filter $secondFilter
22     * @return string[] Fields that are different
23     */
24    public function compareVersions( Filter $firstFilter, Filter $secondFilter ): array {
25        // TODO: Avoid DB references here, re-add when saving the filter
26        $methods = [
27            'af_public_comments' => 'getName',
28            'af_pattern' => 'getRules',
29            'af_comments' => 'getComments',
30            'af_deleted' => 'isDeleted',
31            'af_enabled' => 'isEnabled',
32            'af_hidden' => 'getPrivacyLevel',
33            'af_global' => 'isGlobal',
34            'af_group' => 'getGroup',
35        ];
36
37        $differences = [];
38
39        foreach ( $methods as $field => $method ) {
40            if ( $firstFilter->$method() !== $secondFilter->$method() ) {
41                $differences[] = $field;
42            }
43        }
44
45        $firstActions = $firstFilter->getActions();
46        $secondActions = $secondFilter->getActions();
47        foreach ( $this->consequencesRegistry->getAllEnabledActionNames() as $action ) {
48            if ( isset( $firstActions[$action] ) && isset( $secondActions[$action] ) ) {
49                // They're both set. Double check needed, e.g. per T180194
50                if ( array_diff( $firstActions[$action], $secondActions[$action] ) ||
51                    array_diff( $secondActions[$action], $firstActions[$action] ) ) {
52                    // Different parameters
53                    $differences[] = 'actions';
54                }
55            } elseif ( isset( $firstActions[$action] ) !== isset( $secondActions[$action] ) ) {
56                // One's unset, one's set.
57                $differences[] = 'actions';
58            }
59        }
60
61        return array_unique( $differences );
62    }
63}