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| 1 | <?php |
| 2 | /** |
| 3 | * The Jetpack Connection Protected Owner class file. |
| 4 | * |
| 5 | * @package automattic/jetpack-connection |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Connection; |
| 9 | |
| 10 | use Jetpack_Options; |
| 11 | |
| 12 | /** |
| 13 | * The local anchor naming the connection's protected owner. |
| 14 | * |
| 15 | * WordPress.com is authoritative on who the owner is; this records who the site was told to |
| 16 | * expect, so ownership stops following whoever connected first. Identity is always matched on |
| 17 | * `wpcom_user_id` — `local_user_id` is a re-pointable cache, never the match key. |
| 18 | * |
| 19 | * @since 9.3.0 |
| 20 | */ |
| 21 | class Protected_Owner { |
| 22 | |
| 23 | const OPTION = 'protected_owner'; |
| 24 | |
| 25 | /** |
| 26 | * Get the anchor. |
| 27 | * |
| 28 | * @since 9.3.0 |
| 29 | * |
| 30 | * @return array|null The anchor, or null when none is usable. |
| 31 | */ |
| 32 | public static function get() { |
| 33 | $anchor = Jetpack_Options::get_option( self::OPTION ); |
| 34 | |
| 35 | if ( ! is_array( $anchor ) || empty( $anchor['wpcom_user_id'] ) ) { |
| 36 | return null; |
| 37 | } |
| 38 | |
| 39 | return $anchor; |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * Record the owner WordPress.com has confirmed for this site. |
| 44 | * |
| 45 | * @since 9.3.0 |
| 46 | * @since 9.6.0 No longer records how the owner was confirmed. |
| 47 | * |
| 48 | * @param int $wpcom_user_id The owner's WordPress.com user ID, as confirmed by WordPress.com. |
| 49 | * @param int $local_user_id The owner's local WordPress user ID. Required here, though the |
| 50 | * anchor treats it as a re-pointable cache rather than the match |
| 51 | * key, so a caller that legitimately does not know it yet would |
| 52 | * need this relaxed. |
| 53 | * @return bool Whether the anchor is now stored as requested. |
| 54 | */ |
| 55 | public static function set( $wpcom_user_id, $local_user_id ) { |
| 56 | $wpcom_user_id = absint( $wpcom_user_id ); |
| 57 | $local_user_id = absint( $local_user_id ); |
| 58 | |
| 59 | // A zero ID would store an anchor `get()` rejects. |
| 60 | if ( ! $wpcom_user_id || ! $local_user_id ) { |
| 61 | return false; |
| 62 | } |
| 63 | |
| 64 | $anchor = array( |
| 65 | 'wpcom_user_id' => $wpcom_user_id, |
| 66 | 'local_user_id' => $local_user_id, |
| 67 | 'confirmed_at' => gmdate( 'Y-m-d\TH:i:s\Z' ), |
| 68 | ); |
| 69 | |
| 70 | if ( Jetpack_Options::update_option( self::OPTION, $anchor ) ) { |
| 71 | return true; |
| 72 | } |
| 73 | |
| 74 | // `update_option()` reports false for an unchanged value as well as for a failed write. |
| 75 | return Jetpack_Options::get_option( self::OPTION ) === $anchor; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Point the anchor's cached local user ID at a different local user. |
| 80 | * |
| 81 | * The match key is `wpcom_user_id`; `local_user_id` is a cache of where that identity lives on |
| 82 | * this site, and it legitimately moves when the owner reconnects under another local account. |
| 83 | * Deliberately narrow: `confirmed_at` records when the owner was originally confirmed, and |
| 84 | * re-pointing a cache is not a new confirmation. |
| 85 | * |
| 86 | * @since 9.5.0 |
| 87 | * |
| 88 | * @param int $local_user_id The local user the anchored identity now holds. |
| 89 | * @return bool Whether the anchor now names that local user. |
| 90 | */ |
| 91 | public static function repoint( $local_user_id ) { |
| 92 | $local_user_id = absint( $local_user_id ); |
| 93 | $anchor = self::get(); |
| 94 | |
| 95 | if ( ! $anchor || ! $local_user_id ) { |
| 96 | return false; |
| 97 | } |
| 98 | |
| 99 | // Defaulted: `get()` only requires `wpcom_user_id`, so a partial anchor reaches here. |
| 100 | if ( (int) ( $anchor['local_user_id'] ?? 0 ) === $local_user_id ) { |
| 101 | return true; |
| 102 | } |
| 103 | |
| 104 | $anchor['local_user_id'] = $local_user_id; |
| 105 | |
| 106 | if ( Jetpack_Options::update_option( self::OPTION, $anchor ) ) { |
| 107 | return true; |
| 108 | } |
| 109 | |
| 110 | return Jetpack_Options::get_option( self::OPTION ) === $anchor; |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Drop the anchor, unlocking ownership. |
| 115 | * |
| 116 | * Leaves `master_user` alone: clearing the lock does not change who the owner is. |
| 117 | * |
| 118 | * @internal Recovery and support flows only. Consumers must not call this. |
| 119 | * @since 9.3.0 |
| 120 | * |
| 121 | * @return bool Whether the anchor was deleted. |
| 122 | */ |
| 123 | public static function clear() { |
| 124 | return Jetpack_Options::delete_option( self::OPTION ); |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Get the anchor, but only while it protects somebody. |
| 129 | * |
| 130 | * The anchor is dropped the moment WordPress.com stops confirming it, so holding one and |
| 131 | * being protected by it are the same thing. Kept as the name gates read by, which says what |
| 132 | * the call site means rather than what the storage happens to be. |
| 133 | * |
| 134 | * @since 9.3.0 |
| 135 | * |
| 136 | * @return array|null The anchor, or null when there is none. |
| 137 | */ |
| 138 | public static function get_locked() { |
| 139 | return self::get(); |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Whether an anchor is set and locked. |
| 144 | * |
| 145 | * Deliberately independent of whether the current owner matches it: a mismatch is when |
| 146 | * ownership most needs to stay locked. |
| 147 | * |
| 148 | * @since 9.3.0 |
| 149 | * |
| 150 | * @return bool |
| 151 | */ |
| 152 | public static function is_locked() { |
| 153 | return null !== self::get_locked(); |
| 154 | } |
| 155 | } |