39 lines
1.6 KiB
PHP
39 lines
1.6 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App\Services;
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/** Structural coverage gate. Content accuracy still requires academic review. */
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final class VideoCoverageValidator
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{
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public static function valid(array $coverage, int $durationSeconds, string $videoSha256): bool
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{
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if ($durationSeconds <= 0 || $durationSeconds > 4 * 60 * 60 ||
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!preg_match('/^[0-9a-f]{64}$/i', $videoSha256) ||
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!hash_equals(strtolower($videoSha256), strtolower((string)($coverage['video_sha256'] ?? ''))) ||
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($coverage['truncated'] ?? true) !== false ||
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!empty($coverage['gaps']) ||
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!is_array($coverage['segments'] ?? null) || $coverage['segments'] === []) {
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return false;
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}
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$lastEnd = 0.0;
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foreach ($coverage['segments'] as $segment) {
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if (!is_array($segment) ||
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!is_numeric($segment['start_seconds'] ?? null) ||
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!is_numeric($segment['end_seconds'] ?? null) ||
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!is_string($segment['transcript_ref'] ?? null) || trim($segment['transcript_ref']) === '' ||
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!is_string($segment['visual_ref'] ?? null) || trim($segment['visual_ref']) === '') {
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return false;
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}
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$start = (float)$segment['start_seconds'];
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$end = (float)$segment['end_seconds'];
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if (!is_finite($start) || !is_finite($end) ||
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abs($start - $lastEnd) > 0.5 || $end <= $start || $end > $durationSeconds + 0.5) {
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return false;
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}
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$lastEnd = $end;
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}
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return abs($lastEnd - $durationSeconds) <= 0.5;
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}
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}
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