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<?php |
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defined( 'ABSPATH' ) || exit; |
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/** |
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* Desktop Mode — framework-level presence. |
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* |
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* Tracks who's currently in the desktop-mode WP-Admin and what |
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* their state is — `online`, `inactive`, `offline`. Lives at |
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* framework level so any plugin can consume presence without |
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* depending on chat / collaboration / co-editing features being |
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* enabled. |
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* |
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* **State machine.** Three values, derived from two timestamps: |
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* |
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* - **online** — Heartbeat seen within `_offline_after` seconds |
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* AND user activity (mousedown / keydown) within |
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* `_inactive_after` seconds (default 300s = 5 min). |
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* - **inactive** — Heartbeat seen within `_offline_after` but no |
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* user activity within `_inactive_after`. |
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* - **offline** — no Heartbeat in `_offline_after` (default 120s). |
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* |
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* Storage is a single autoload=false option (`_desktop_mode_presence`) |
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* shaped `array<int user_id, array{ last_seen_ms, last_active_ms }>`. |
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* Single-row keeps autoload happy and avoids per-user options. |
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* |
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* **Public surface.** PHP helpers: |
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* |
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* - `desktop_mode_presence_record( $user_id, $active )` |
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* - `desktop_mode_presence_status_for_user( $user_id )` |
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* - `desktop_mode_presence_get_all()` |
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* - `desktop_mode_presence_snapshot( $user_ids = null )` |
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* |
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* Filters: |
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* |
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* - `desktop_mode_presence_inactive_after` — int seconds. Default 300. |
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* - `desktop_mode_presence_offline_after` — int seconds. Default 120. |
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* - `desktop_mode_presence_can_track` — bool, $user_id. Veto. |
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* - `desktop_mode_presence_visible_users` — int[], $viewer_id. |
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* Privacy gate for who's |
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* surfaced to a given user. |
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* |
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* Actions: |
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* |
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* - `desktop_mode_presence_recorded( $user_id, $record )` — on every |
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* bump. |
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* - `desktop_mode_presence_changed( $user_id, $new, $old )` — on |
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* state transitions only. |
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* |
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* REST: `/desktop-mode/v1/presence` (GET snapshot, POST mark active / |
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* inactive). |
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* |
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* @package WPDesktopMode |
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*/ |
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|
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const DESKTOP_MODE_PRESENCE_OPTION = '_desktop_mode_presence'; |
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|
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/** |
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* Read the entire presence map. Single autoload=false option. |
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* |
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* @return array<int,array{last_seen_ms:int,last_active_ms:int}> |
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*/ |
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function desktop_mode_presence_get_all() { |
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$raw = get_option( DESKTOP_MODE_PRESENCE_OPTION, array() ); |
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if ( ! is_array( $raw ) ) { |
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return array(); |
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} |
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$out = array(); |
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foreach ( $raw as $uid => $record ) { |
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$uid = (int) $uid; |
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if ( $uid <= 0 || ! is_array( $record ) ) { |
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continue; |
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} |
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$out[ $uid ] = array( |
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'last_seen_ms' => isset( $record['last_seen_ms'] ) ? (int) $record['last_seen_ms'] : 0, |
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'last_active_ms' => isset( $record['last_active_ms'] ) ? (int) $record['last_active_ms'] : 0, |
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); |
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} |
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return $out; |
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} |
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|
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/** |
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* Record a "user is alive" heartbeat. Bumps `last_seen_ms`. If |
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* `$active` is true, also bumps `last_active_ms` (the user just |
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* interacted, not just held a tab open). |
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* |
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* Cheap enough to call every Heartbeat tick: the option write is |
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* throttled — a bump that neither transitions the computed status |
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* nor moves a persisted timestamp by at least half the offline |
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* threshold (capped at 60s) skips the `update_option()` call, so N |
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* idle users no longer rewrite the shared row every tick. Persisted |
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* timestamps can therefore lag real activity by up to the throttle |
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* window — always well inside the offline threshold, so computed |
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* statuses stay correct. Fires `desktop_mode_presence_recorded` on |
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* every call (with the fresh, un-throttled record) and |
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* `desktop_mode_presence_changed` only when the computed status moves |
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* between `online | inactive | offline`. |
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* |
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* The `desktop_mode_presence_can_track` filter is the per-user opt-out: |
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* a plugin that hides specific accounts (compliance, "set yourself |
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* invisible", etc.) returns false to skip the bump entirely. |
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* |
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* @param int $user_id User to record. |
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* @param bool $active Pass `true` when the heartbeat is paired with |
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* explicit user activity (mousedown, keydown). |
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* @return bool True if recorded; false if vetoed by filter or invalid id. |
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*/ |
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function desktop_mode_presence_record( $user_id, $active = true ) { |
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$user_id = (int) $user_id; |
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if ( $user_id <= 0 ) { |
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return false; |
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} |
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|
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/** |
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* Per-user veto on presence tracking. Return false to skip the |
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* bump entirely — useful for "appear offline" toggles, audit |
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* exemptions for sensitive accounts, or forcing a non-admin |
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* never-tracked policy. |
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* |
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* @param bool $can Default true. |
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* @param int $user_id The user being tracked. |
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*/ |
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$can = (bool) apply_filters( 'desktop_mode_presence_can_track', true, $user_id ); |
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if ( ! $can ) { |
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return false; |
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} |
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|
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$now_ms = (int) round( microtime( true ) * 1000 ); |
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$all = desktop_mode_presence_get_all(); |
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$prev = isset( $all[ $user_id ] ) ? $all[ $user_id ] : array( |
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'last_seen_ms' => 0, |
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'last_active_ms' => 0, |
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); |
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$prev_status = desktop_mode_presence_status_from_record( $prev ); |
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|
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$next = array( |
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'last_seen_ms' => $now_ms, |
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'last_active_ms' => $active ? $now_ms : (int) $prev['last_active_ms'], |
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); |
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|
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$next_status = desktop_mode_presence_status_from_record( $next ); |
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|
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if ( desktop_mode_presence_should_persist( $all, $user_id, $prev, $prev_status, $next_status, $active, $now_ms ) ) { |
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$all[ $user_id ] = $next; |
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update_option( DESKTOP_MODE_PRESENCE_OPTION, $all, false ); |
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} |
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|
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/** |
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* Fires on every recorded heartbeat — useful for audit logging |
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* or third-party "who's around right now" dashboards. Fires |
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* regardless of whether the computed status changed. |
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* |
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* @param int $user_id |
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* @param array $record { last_seen_ms, last_active_ms } |
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*/ |
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do_action( 'desktop_mode_presence_recorded', $user_id, $next ); |
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|
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if ( $next_status !== $prev_status ) { |
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/** |
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* Fires when a user's computed presence status transitions. |
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* Plugins driving "user came online / went offline" UI hook |
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* here — the recorded action above fires every tick whether |
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* the state changed or not, which would be too noisy. |
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* |
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* @param int $user_id |
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* @param string $new_status One of `online | inactive | offline`. |
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* @param string $old_status One of `online | inactive | offline`. |
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*/ |
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do_action( 'desktop_mode_presence_changed', $user_id, $next_status, $prev_status ); |
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} |
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return true; |
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} |
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|
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/** |
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* Decide whether a presence bump needs to hit the database. |
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* |
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* The presence map is a single shared option row: with N concurrent |
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* users an unconditional write per Heartbeat tick means N full-row |
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* rewrites (plus option-cache invalidations) every ~15s, almost all |
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* of them recording no meaningful change. A bump must persist when: |
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* |
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* - the user isn't in the map yet (first sighting), |
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* - the computed status transitioned (viewers must see it), or |
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* - a persisted timestamp has drifted by at least the throttle |
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* window — half the offline threshold, capped at 60s — so stored |
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* `last_seen_ms` can never age anywhere near the offline cutoff |
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* while the user is genuinely present. |
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* |
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* Everything else is a redundant rewrite and is skipped. Skipped |
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* bumps still fire `desktop_mode_presence_recorded` with the fresh |
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* record — only the persisted copy lags. |
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* |
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* @param array $all Stored presence map. |
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* @param int $user_id User being bumped. |
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* @param array $prev Stored record for the user (zeros if new). |
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* @param string $prev_status Status computed from the stored record. |
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* @param string $next_status Status computed from the fresh record. |
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* @param bool $active Whether this bump carries user activity. |
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* @param int $now_ms Current epoch milliseconds. |
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* @return bool True to persist, false to skip the write. |
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*/ |
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function desktop_mode_presence_should_persist( $all, $user_id, $prev, $prev_status, $next_status, $active, $now_ms ) { |
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if ( ! isset( $all[ $user_id ] ) ) { |
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return true; |
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} |
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if ( $next_status !== $prev_status ) { |
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return true; |
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} |
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|
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/** This filter is documented in includes/presence.php */ |
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$offline_after = (int) apply_filters( 'desktop_mode_presence_offline_after', 120 ); |
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$throttle_ms = (int) min( 60 * 1000, $offline_after * 500 ); |
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|
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if ( ( $now_ms - (int) $prev['last_seen_ms'] ) >= $throttle_ms ) { |
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return true; |
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} |
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if ( $active && ( $now_ms - (int) $prev['last_active_ms'] ) >= $throttle_ms ) { |
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return true; |
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} |
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return false; |
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} |
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|
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/** |
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* Compute presence status from a record. |
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* |
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* Pure function — given the same `(record, now)`, always returns |
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* the same answer. Filters override the thresholds, not the logic |
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* order; an `online` user transitions through `inactive` to |
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* `offline` if they're idle long enough. |
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* |
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* @param array $record { last_seen_ms?: int, last_active_ms?: int } |
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* @return string `online | inactive | offline` |
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*/ |
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function desktop_mode_presence_status_from_record( $record ) { |
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$now_ms = (int) round( microtime( true ) * 1000 ); |
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$last_seen = isset( $record['last_seen_ms'] ) ? (int) $record['last_seen_ms'] : 0; |
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$last_active = isset( $record['last_active_ms'] ) ? (int) $record['last_active_ms'] : 0; |
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|
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/** |
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* Inactive threshold (default 300s = 5 min). Online users |
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* transition to `inactive` when they haven't moused / typed |
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* for this long, even if Heartbeat keeps firing. |
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* |
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* @param int $seconds |
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*/ |
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$inactive_after = (int) apply_filters( 'desktop_mode_presence_inactive_after', 300 ); |
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|
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/** |
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* Offline threshold (default 120s = 2 min). Inactive / online |
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* users transition to `offline` when the last Heartbeat is |
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* older than this. |
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* |
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* @param int $seconds |
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*/ |
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$offline_after = (int) apply_filters( 'desktop_mode_presence_offline_after', 120 ); |
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|
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if ( $now_ms - $last_seen > $offline_after * 1000 ) { |
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return 'offline'; |
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} |
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if ( $now_ms - $last_active > $inactive_after * 1000 ) { |
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return 'inactive'; |
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} |
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return 'online'; |
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} |
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|
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/** |
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* Look up presence status for a single user. |
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* |
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* @param int $user_id |
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* @return string `online | inactive | offline` |
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*/ |
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function desktop_mode_presence_status_for_user( $user_id ) { |
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$all = desktop_mode_presence_get_all(); |
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$record = isset( $all[ (int) $user_id ] ) ? $all[ (int) $user_id ] : array(); |
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return desktop_mode_presence_status_from_record( (array) $record ); |
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} |
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|
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/** |
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* Build a presence snapshot. With `$user_ids = null` returns every |
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* tracked user; with a list returns only those ids (useful for |
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* "users I care about" filtering — e.g., a plugin that surfaces |
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* the subset of users relevant to the viewer). |
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* |
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* Output shape uses string keys so the JSON encoder produces an |
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* object (not a sparse array) when the smallest id isn't 1. |
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* |
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* @param int[]|null $user_ids Restrict to these ids. `null` = all. |
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* @return array<string,array{ status:string, lastSeenMs:int, lastActiveMs:int }> |
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*/ |
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function desktop_mode_presence_snapshot( $user_ids = null ) { |
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$all = desktop_mode_presence_get_all(); |
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$out = array(); |
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|
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if ( null === $user_ids ) { |
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$ids = array_keys( $all ); |
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} else { |
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$ids = array(); |
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foreach ( (array) $user_ids as $uid ) { |
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$uid = (int) $uid; |
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if ( $uid > 0 ) { |
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$ids[] = $uid; |
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} |
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} |
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} |
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|
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foreach ( $ids as $uid ) { |
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$record = isset( $all[ $uid ] ) ? $all[ $uid ] : array(); |
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$out[ (string) $uid ] = array( |
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'status' => desktop_mode_presence_status_from_record( $record ), |
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'lastSeenMs' => isset( $record['last_seen_ms'] ) ? (int) $record['last_seen_ms'] : 0, |
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'lastActiveMs' => isset( $record['last_active_ms'] ) ? (int) $record['last_active_ms'] : 0, |
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); |
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} |
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return $out; |
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} |
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|
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/** |
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* Filter a list of candidate user ids down to those a given viewer |
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* is allowed to see presence for. Defaults to passing the list |
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* through unchanged — plugins implementing per-team / per-role |
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* privacy boundaries hook `desktop_mode_presence_visible_users` |
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* (e.g., "subscribers can only see other subscribers' presence"). |
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* |
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* @param int[] $candidate_user_ids |
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* @param int $viewer_id Defaults to the current user. |
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* @return int[] |
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*/ |
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function desktop_mode_presence_visible_users( $candidate_user_ids, $viewer_id = 0 ) { |
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$viewer_id = (int) $viewer_id ?: get_current_user_id(); |
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$ids = array(); |
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foreach ( (array) $candidate_user_ids as $uid ) { |
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$uid = (int) $uid; |
| 331 |
if ( $uid > 0 ) { |
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$ids[] = $uid; |
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} |
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} |
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$ids = array_values( array_unique( $ids ) ); |
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|
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/** |
| 338 |
* Filter the list of user ids whose presence is visible to |
| 339 |
* `$viewer_id`. Default behaviour: all candidates pass. Hook |
| 340 |
* to enforce privacy — e.g., subscribers only see other |
| 341 |
* subscribers; admins see everyone; an opt-out list never shows. |
| 342 |
* |
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* @param int[] $ids Candidate user ids. |
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* @param int $viewer_id The user requesting visibility. |
| 345 |
*/ |
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return (array) apply_filters( 'desktop_mode_presence_visible_users', $ids, $viewer_id ); |
| 347 |
} |
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|
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/** |
| 350 |
* Daily cron: prune presence entries for users idle >14 days. |
| 351 |
* Keeps the option compact even on long-running sites. |
| 352 |
*/ |
| 353 |
function desktop_mode_presence_cron_prune() { |
| 354 |
$all = desktop_mode_presence_get_all(); |
| 355 |
if ( empty( $all ) ) { |
| 356 |
return; |
| 357 |
} |
| 358 |
$threshold = (int) round( microtime( true ) * 1000 ) - ( 14 * DAY_IN_SECONDS * 1000 ); |
| 359 |
$pruned = array(); |
| 360 |
foreach ( $all as $uid => $record ) { |
| 361 |
if ( ( (int) $record['last_seen_ms'] ) < $threshold ) { |
| 362 |
continue; |
| 363 |
} |
| 364 |
$pruned[ (int) $uid ] = $record; |
| 365 |
} |
| 366 |
if ( count( $pruned ) !== count( $all ) ) { |
| 367 |
update_option( DESKTOP_MODE_PRESENCE_OPTION, $pruned, false ); |
| 368 |
} |
| 369 |
} |
| 370 |
add_action( 'desktop_mode_presence_daily_prune', 'desktop_mode_presence_cron_prune' ); |
| 371 |
|
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/** |
| 373 |
* Schedule the daily cron once. Idempotent. |
| 374 |
*/ |
| 375 |
function desktop_mode_presence_schedule_cron() { |
| 376 |
if ( ! wp_next_scheduled( 'desktop_mode_presence_daily_prune' ) ) { |
| 377 |
wp_schedule_event( time() + DAY_IN_SECONDS, 'daily', 'desktop_mode_presence_daily_prune' ); |
| 378 |
} |
| 379 |
} |
| 380 |
add_action( 'init', 'desktop_mode_presence_schedule_cron', 50 ); |
| 381 |
|
| 382 |
/* ------------------------------------------------------------------------- |
| 383 |
* Heartbeat integration |
| 384 |
* ----------------------------------------------------------------------- */ |
| 385 |
|
| 386 |
/** |
| 387 |
* Heartbeat handler — bumps presence on every tick a desktop-mode |
| 388 |
* user is on the page. Returns the visible-presence snapshot in |
| 389 |
* the response so the client store can update without a separate |
| 390 |
* REST round-trip. |
| 391 |
* |
| 392 |
* Triggered by the client opting in via `desktop_mode_presence_active: |
| 393 |
* true` in the heartbeat-send payload, with optional |
| 394 |
* `desktop_mode_user_active` (mousedown / keydown within the |
| 395 |
* inactive-threshold window). |
| 396 |
* |
| 397 |
* @param array $response Pre-filtered response. |
| 398 |
* @param array $data Client-sent payload. |
| 399 |
* @return array |
| 400 |
*/ |
| 401 |
function desktop_mode_presence_heartbeat_received( $response, $data ) { |
| 402 |
if ( ! is_array( $response ) ) { |
| 403 |
$response = array(); |
| 404 |
} |
| 405 |
if ( empty( $data['desktop_mode_presence_active'] ) ) { |
| 406 |
return $response; |
| 407 |
} |
| 408 |
if ( ! function_exists( 'desktop_mode_is_enabled' ) || ! desktop_mode_is_enabled() ) { |
| 409 |
return $response; |
| 410 |
} |
| 411 |
$user_id = (int) get_current_user_id(); |
| 412 |
$user_active = ! empty( $data['desktop_mode_user_active'] ); |
| 413 |
|
| 414 |
desktop_mode_presence_record( $user_id, $user_active ); |
| 415 |
|
| 416 |
// Snapshot the users this viewer is allowed to see — by default |
| 417 |
// all tracked users; plugins can narrow via the |
| 418 |
// `desktop_mode_presence_visible_users` filter. |
| 419 |
$all_ids = array_keys( desktop_mode_presence_get_all() ); |
| 420 |
$visible = desktop_mode_presence_visible_users( $all_ids, $user_id ); |
| 421 |
|
| 422 |
$response['desktop_mode_presence'] = array( |
| 423 |
'snapshot' => desktop_mode_presence_snapshot( $visible ), |
| 424 |
'serverTimeMs' => (int) round( microtime( true ) * 1000 ), |
| 425 |
); |
| 426 |
return $response; |
| 427 |
} |
| 428 |
add_filter( 'heartbeat_received', 'desktop_mode_presence_heartbeat_received', 5, 2 ); |
| 429 |
|
| 430 |
/* ------------------------------------------------------------------------- |
| 431 |
* REST endpoints |
| 432 |
* ----------------------------------------------------------------------- */ |
| 433 |
|
| 434 |
/** |
| 435 |
* Permission gate for presence endpoints — login required + |
| 436 |
* desktop mode enabled. Delegates to the shared |
| 437 |
* {@see desktop_mode_rest_require_enabled()} gate. |
| 438 |
* |
| 439 |
* @return true|WP_Error |
| 440 |
*/ |
| 441 |
function desktop_mode_presence_rest_permission() { |
| 442 |
return desktop_mode_rest_require_enabled(); |
| 443 |
} |
| 444 |
|
| 445 |
/** |
| 446 |
* Register `/desktop-mode/v1/presence` routes. |
| 447 |
*/ |
| 448 |
function desktop_mode_presence_register_rest_routes() { |
| 449 |
register_rest_route( |
| 450 |
'desktop-mode/v1', |
| 451 |
'/presence', |
| 452 |
array( |
| 453 |
array( |
| 454 |
'methods' => WP_REST_Server::READABLE, |
| 455 |
'permission_callback' => 'desktop_mode_presence_rest_permission', |
| 456 |
'callback' => 'desktop_mode_presence_rest_get', |
| 457 |
), |
| 458 |
array( |
| 459 |
'methods' => WP_REST_Server::CREATABLE, |
| 460 |
'permission_callback' => 'desktop_mode_presence_rest_permission', |
| 461 |
'callback' => 'desktop_mode_presence_rest_post', |
| 462 |
'args' => array( |
| 463 |
'active' => array( 'type' => 'boolean' ), |
| 464 |
'inactive' => array( 'type' => 'boolean' ), |
| 465 |
), |
| 466 |
), |
| 467 |
) |
| 468 |
); |
| 469 |
} |
| 470 |
add_action( 'rest_api_init', 'desktop_mode_presence_register_rest_routes' ); |
| 471 |
|
| 472 |
/** |
| 473 |
* GET /desktop-mode/v1/presence — current snapshot, narrowed by the |
| 474 |
* visibility filter. |
| 475 |
*/ |
| 476 |
function desktop_mode_presence_rest_get() { |
| 477 |
$viewer_id = (int) get_current_user_id(); |
| 478 |
$all_ids = array_keys( desktop_mode_presence_get_all() ); |
| 479 |
$visible = desktop_mode_presence_visible_users( $all_ids, $viewer_id ); |
| 480 |
return rest_ensure_response( |
| 481 |
array( |
| 482 |
'snapshot' => desktop_mode_presence_snapshot( $visible ), |
| 483 |
'serverTimeMs' => (int) round( microtime( true ) * 1000 ), |
| 484 |
) |
| 485 |
); |
| 486 |
} |
| 487 |
|
| 488 |
/** |
| 489 |
* POST /desktop-mode/v1/presence — explicit bump. Body shape: |
| 490 |
* |
| 491 |
* - `{ active: true }` → bump both seen + active timestamps. |
| 492 |
* - `{ active: false }` → bump seen only (window in background). |
| 493 |
* - `{ inactive: true }` → bump seen only AND zero active so the |
| 494 |
* user lands on `inactive` immediately |
| 495 |
* (the "set yourself away" UI hook). |
| 496 |
* |
| 497 |
* Defaults to `{ active: true }` when neither flag is supplied — |
| 498 |
* the simplest "I'm here" call. |
| 499 |
*/ |
| 500 |
function desktop_mode_presence_rest_post( WP_REST_Request $request ) { |
| 501 |
$user_id = (int) get_current_user_id(); |
| 502 |
$active = $request->get_param( 'active' ); |
| 503 |
$inactive = (bool) $request->get_param( 'inactive' ); |
| 504 |
|
| 505 |
if ( $inactive ) { |
| 506 |
// Set the user immediately to `inactive`: bump last_seen |
| 507 |
// (still alive) but force last_active to zero (no recent |
| 508 |
// interaction). |
| 509 |
$all = desktop_mode_presence_get_all(); |
| 510 |
$rec = isset( $all[ $user_id ] ) ? $all[ $user_id ] : array( |
| 511 |
'last_seen_ms' => 0, |
| 512 |
'last_active_ms' => 0, |
| 513 |
); |
| 514 |
$prev_status = desktop_mode_presence_status_from_record( $rec ); |
| 515 |
$rec['last_seen_ms'] = (int) round( microtime( true ) * 1000 ); |
| 516 |
$rec['last_active_ms'] = 0; |
| 517 |
$all[ $user_id ] = $rec; |
| 518 |
update_option( DESKTOP_MODE_PRESENCE_OPTION, $all, false ); |
| 519 |
|
| 520 |
$next_status = desktop_mode_presence_status_from_record( $rec ); |
| 521 |
do_action( 'desktop_mode_presence_recorded', $user_id, $rec ); |
| 522 |
if ( $next_status !== $prev_status ) { |
| 523 |
do_action( 'desktop_mode_presence_changed', $user_id, $next_status, $prev_status ); |
| 524 |
} |
| 525 |
} else { |
| 526 |
$flag = ( null === $active ) ? true : (bool) $active; |
| 527 |
desktop_mode_presence_record( $user_id, $flag ); |
| 528 |
} |
| 529 |
|
| 530 |
return rest_ensure_response( array( 'ok' => true ) ); |
| 531 |
} |
| 532 |
|
