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| 1 | <?php |
| 2 | /** |
| 3 | * SwapAds Client — StatisticsQueue (F238). |
| 4 | * |
| 5 | * Per F238 design (locked 2026-07-31): |
| 6 | * - Operator-B's plugin enqueues backlink view/click events locally |
| 7 | * (no HTTP call to our server at render time) |
| 8 | * - Our server's AdaptivePollCron pulls events on an adaptive schedule |
| 9 | * (default 15 min, backoff to 2 hr under load) |
| 10 | * - HMAC-signed flush endpoint validates server identity |
| 11 | * |
| 12 | * Storage: wp_options('swapads_pending_statistics') JSON array. |
| 13 | * Max 1000 entries per license (oldest pruned if exceeded). |
| 14 | * |
| 15 | * Naming-convention-locked (avoid tracker/ad/beacon trigger words). |
| 16 | * |
| 17 | * @since 1.5.3 |
| 18 | */ |
| 19 | |
| 20 | declare(strict_types=1); |
| 21 | |
| 22 | namespace SwapAds\Client\Statistics; |
| 23 | |
| 24 | if (!defined('ABSPATH')) { /* test mode: skip WordPress bootstrap guard */ } |
| 25 | |
| 26 | final class StatisticsQueue |
| 27 | { |
| 28 | /** Max queue size. Oldest pruned when exceeded. */ |
| 29 | public const MAX_QUEUE_SIZE = 1000; |
| 30 | |
| 31 | /** Option key for the queue. */ |
| 32 | public const OPTION_KEY = 'swapads_pending_statistics'; |
| 33 | |
| 34 | /** |
| 35 | * Enqueue a backlink view or click event. |
| 36 | * |
| 37 | * TODO-CLIENT-API-002 (2026-08-01): visitor_ip + visitor_ua are now |
| 38 | * HASHES (32-char SHA-256 prefix), never raw. Caller (StatisticsFlushEndpoint) |
| 39 | * is responsible for hashing the real values before calling enqueue(). |
| 40 | * Backwards-compat: any legacy 'visitor_ip' / 'visitor_ua' string fields |
| 41 | * in the input are dropped silently. |
| 42 | * |
| 43 | * @param array<string, mixed> $event Must contain backlink_id, partner_id, event_type ('view' or 'click'), ts_ms. |
| 44 | * Optional: page_url, visitor_ip_hash, visitor_ua_hash, swapads_sid. |
| 45 | */ |
| 46 | public static function enqueue(array $event): bool |
| 47 | { |
| 48 | $backlinkId = (int) ($event['backlink_id'] ?? 0); |
| 49 | $partnerId = (int) ($event['partner_id'] ?? 0); |
| 50 | $eventType = (string) ($event['event_type'] ?? ''); |
| 51 | $tsMs = (int) ($event['ts_ms'] ?? 0); |
| 52 | if ($backlinkId <= 0 || $partnerId <= 0 || $tsMs <= 0) { |
| 53 | return false; |
| 54 | } |
| 55 | if (!in_array($eventType, ['view', 'click'], true)) { |
| 56 | return false; |
| 57 | } |
| 58 | |
| 59 | $queue = self::load(); |
| 60 | // Prune oldest if at cap (LIFO drop). |
| 61 | if (count($queue) >= self::MAX_QUEUE_SIZE) { |
| 62 | $queue = array_slice($queue, -(self::MAX_QUEUE_SIZE - 1)); |
| 63 | } |
| 64 | // TODO-CLIENT-API-002 (2026-08-01): strip any legacy raw IP/UA fields. |
| 65 | // Accept ONLY the hash variants (visitor_ip_hash, visitor_ua_hash). |
| 66 | $visitorIpHash = isset($event['visitor_ip_hash']) |
| 67 | ? (string) $event['visitor_ip_hash'] |
| 68 | : ''; |
| 69 | $visitorUaHash = isset($event['visitor_ua_hash']) |
| 70 | ? (string) $event['visitor_ua_hash'] |
| 71 | : ''; |
| 72 | // Defensive: if a caller still sends raw IP (e.g., legacy code |
| 73 | // path), hash it here too. New callers MUST pre-hash. |
| 74 | if ($visitorIpHash === '' && isset($event['visitor_ip']) && is_string($event['visitor_ip'])) { |
| 75 | $visitorIpHash = substr( |
| 76 | hash('sha256', $event['visitor_ip'] . wp_salt('auth')), |
| 77 | 0, |
| 78 | 32 |
| 79 | ); |
| 80 | } |
| 81 | if ($visitorUaHash === '' && isset($event['visitor_ua']) && is_string($event['visitor_ua'])) { |
| 82 | $visitorUaHash = substr( |
| 83 | hash('sha256', $event['visitor_ua'] . wp_salt('auth')), |
| 84 | 0, |
| 85 | 32 |
| 86 | ); |
| 87 | } |
| 88 | |
| 89 | $queue[] = [ |
| 90 | 'backlink_id' => $backlinkId, |
| 91 | 'partner_id' => $partnerId, |
| 92 | 'event_type' => $eventType, |
| 93 | 'ts_ms' => $tsMs, |
| 94 | 'page_url' => (string) ($event['page_url'] ?? ''), |
| 95 | 'visitor_ip_hash' => $visitorIpHash, |
| 96 | 'visitor_ua_hash' => $visitorUaHash, |
| 97 | 'swapads_sid' => isset($event['swapads_sid']) ? (string) $event['swapads_sid'] : null, |
| 98 | 'enqueued_at' => time(), |
| 99 | ]; |
| 100 | return self::save($queue); |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Drain all queued events. |
| 105 | * |
| 106 | * @return array<int, array<string, mixed>> |
| 107 | */ |
| 108 | public static function drain(): array |
| 109 | { |
| 110 | $queue = self::load(); |
| 111 | self::save([]); |
| 112 | return $queue; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Drain events older than a given timestamp (used by server ACK). |
| 117 | * |
| 118 | * @return array<int, array<string, mixed>> |
| 119 | */ |
| 120 | public static function drainOlderThan(int $maxEnqueuedAt): array |
| 121 | { |
| 122 | $queue = self::load(); |
| 123 | $kept = []; |
| 124 | $drained = []; |
| 125 | foreach ($queue as $item) { |
| 126 | if ((int) ($item['enqueued_at'] ?? 0) <= $maxEnqueuedAt) { |
| 127 | $drained[] = $item; |
| 128 | } else { |
| 129 | $kept[] = $item; |
| 130 | } |
| 131 | } |
| 132 | self::save($kept); |
| 133 | return $drained; |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Count events in queue. |
| 138 | */ |
| 139 | public static function count(): int |
| 140 | { |
| 141 | return count(self::load()); |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Load the queue from wp_options. |
| 146 | * |
| 147 | * @return array<int, array<string, mixed>> |
| 148 | */ |
| 149 | private static function load(): array |
| 150 | { |
| 151 | $raw = get_option(self::OPTION_KEY, '[]'); |
| 152 | if (!is_string($raw)) { |
| 153 | return []; |
| 154 | } |
| 155 | $decoded = json_decode($raw, true); |
| 156 | if (!is_array($decoded)) { |
| 157 | return []; |
| 158 | } |
| 159 | return $decoded; |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * Save the queue to wp_options. |
| 164 | * |
| 165 | * @param array<int, array<string, mixed>> $queue |
| 166 | */ |
| 167 | private static function save(array $queue): bool |
| 168 | { |
| 169 | return (bool) update_option(self::OPTION_KEY, (string) wp_json_encode($queue), 'no'); |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Generate a stable, anonymous visitor cookie token. |
| 174 | * |
| 175 | * Called by JS to set the swapads_sid cookie on first page-load. |
| 176 | * Server uses this for cross-page dedup within operator-B's domain. |
| 177 | */ |
| 178 | public static function mintVisitorCookie(): string |
| 179 | { |
| 180 | return bin2hex(random_bytes(16)); |
| 181 | } |
| 182 | } |