60 lines
1.7 KiB
PHP
60 lines
1.7 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App\Services\Baselines;
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use App\Services\Drift\DriftHasher;
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/**
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* Computes the snapshot_identity_hash for baseline snapshot content dedupe.
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*
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* The identity hash is a sha256 over normalized snapshot items, enabling
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* detection of "nothing changed" when capturing the same inventory state.
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*/
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final class BaselineSnapshotIdentity
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{
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public function __construct(
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private readonly DriftHasher $hasher,
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) {}
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/**
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* Compute identity hash over a set of snapshot items.
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*
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* Each item is represented as an associative array with:
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* - subject_type, subject_external_id, policy_type, baseline_hash
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*
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* @param array<int, array{subject_type: string, subject_external_id: string, policy_type: string, baseline_hash: string}> $items
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*/
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public function computeIdentity(array $items): string
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{
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if ($items === []) {
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return hash('sha256', '[]');
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}
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$normalized = array_map(
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fn (array $item): string => implode('|', [
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trim((string) ($item['subject_type'] ?? '')),
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trim((string) ($item['subject_external_id'] ?? '')),
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trim((string) ($item['policy_type'] ?? '')),
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trim((string) ($item['baseline_hash'] ?? '')),
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]),
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$items,
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);
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sort($normalized, SORT_STRING);
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return hash('sha256', implode("\n", $normalized));
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}
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/**
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* Compute a stable content hash for a single inventory item's metadata.
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*
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* Strips volatile OData keys and normalizes for stable comparison.
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*/
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public function hashItemContent(mixed $metaJsonb): string
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{
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return $this->hasher->hashNormalized($metaJsonb);
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}
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}
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