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<?php |
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/** |
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* xSpeed Hub — the site side of the multi-site hub attach flow. |
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* |
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* The Hub (xspeedcache.com) lets one AI connection manage many sites. A |
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* site is always attached FROM the plugin (the admin has proof of |
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* ownership here). Two methods, both surfaced in the MCP Server panel's |
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* "xSpeed Hub" card: |
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* |
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* Method 1 — Token: the plugin surfaces this site's URL + its MCP |
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* `site_token`; the admin pastes both into their xspeedcache.com |
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* account. The Hub then presents that token back to us on every call |
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* (X-XSpeed-MCP-Token, validated by Mcp_Auth) — identical to the |
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* per-site broker credential, so nothing new is trusted. |
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* |
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* Method 2 — OAuth (one click): redirect to the Hub to log in + approve. |
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* Lands with the OAuth front door (Phase 4). Not wired here yet. |
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* |
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* This class holds ONLY the hub-link bookkeeping (which account this site |
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* reports being attached to, for the panel's status line). The credential |
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* itself is the existing Mcp_Pairing::site_token() — we do not mint a |
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* second secret. |
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* |
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* State lives in its own option so it is orthogonal to the per-site |
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* pairing state (disconnecting one never disturbs the other). |
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* |
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* @package XSpeed |
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*/ |
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|
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declare(strict_types=1); |
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|
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namespace XSpeed\Modules\Mcp; |
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|
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defined( 'ABSPATH' ) || exit; |
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|
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final class Mcp_Hub { |
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|
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/** Option key holding hub-link state (separate from pairing state). */ |
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public const OPTION = 'xspeed_module_mcp_hub'; |
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|
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/** Per-user meta key holding THIS admin's hub connection state. A WP site |
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* can have many admins, each managing it from their own hub account, so |
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* the connection is per-user, not site-wide. */ |
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public const USER_META = 'xspeed_hub_link'; |
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|
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/** Default hub dashboard base — where the user manages their account. */ |
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public const DEFAULT_HUB_URL = 'https://app.xspeedcache.com'; |
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|
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/** |
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* The hub dashboard base URL. Overridable via the XSPEED_HUB_URL |
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* constant (wp-config.php) and the `xspeed_hub_url` filter so dev / |
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* self-hosted deployments can point elsewhere. |
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*/ |
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public static function hub_url(): string { |
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$url = self::DEFAULT_HUB_URL; |
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if ( defined( 'XSPEED_HUB_URL' ) && is_string( constant( 'XSPEED_HUB_URL' ) ) && '' !== constant( 'XSPEED_HUB_URL' ) ) { |
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$url = (string) constant( 'XSPEED_HUB_URL' ); |
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} |
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/** Filter the xSpeed Hub base URL. */ |
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$url = (string) apply_filters( 'xspeed_hub_url', $url ); |
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return untrailingslashit( $url ); |
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} |
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|
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/** |
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* Hub-link state for the CURRENT admin (per-user). Falls back to the legacy |
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* site-wide option for sites attached before the per-user migration, so an |
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* existing connection still shows until re-attached. |
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* |
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* @param int|null $user_id Which user (defaults to the current user). |
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* @return array{attached:bool,account_email:string,attached_at:int} |
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*/ |
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public static function state( ?int $user_id = null ): array { |
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$user_id = $user_id ?? get_current_user_id(); |
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$stored = $user_id ? get_user_meta( $user_id, self::USER_META, true ) : array(); |
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|
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// Backward-compat: fall back to the old site-wide option if this user |
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// has no per-user record yet (pre-1.1 attach). |
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if ( ! is_array( $stored ) || empty( $stored ) ) { |
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$legacy = get_option( self::OPTION, array() ); |
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$stored = is_array( $legacy ) ? $legacy : array(); |
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} |
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|
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return array( |
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'attached' => ! empty( $stored['attached'] ), |
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'account_email' => isset( $stored['account_email'] ) ? (string) $stored['account_email'] : '', |
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'attached_at' => isset( $stored['attached_at'] ) ? (int) $stored['attached_at'] : 0, |
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); |
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} |
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|
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/** |
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* Public snapshot for the dashboard "xSpeed Hub" card. |
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* |
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* Includes the paste-in values for Method 1 (this site's URL + token) |
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* and a link to the hub dashboard. The token is admin-only (the whole |
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* REST route is gated by manage_options in McpModule). |
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* |
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* @return array<string,mixed> |
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*/ |
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public static function public_status( ?int $user_id = null ): array { |
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$state = self::state( $user_id ); |
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return array( |
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'attached' => $state['attached'], |
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'account_email' => $state['account_email'], |
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'attached_at' => $state['attached_at'], |
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'site_url' => home_url( '/' ), |
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// Method 1 paste-in credential — the existing per-site token. |
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// Empty until generate_token() (or a per-site Connect) mints one. |
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'site_token' => Mcp_Pairing::site_token(), |
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'hub_url' => self::hub_url(), |
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// Where the user goes to paste the URL + token (Add site form). |
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'add_site_url' => self::hub_url() . '/sites/add', |
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// Method 2 (OAuth attach) — one-click redirect with a fresh nonce. |
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'attach_url' => self::attach_url(), |
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); |
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} |
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|
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/** |
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* Method 1 — ensure a site_token exists and return the paste-in values. |
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* |
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* Reuses Mcp_Pairing::connect() so the Hub credential is the SAME token |
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* the per-site path uses (no second secret, no drift). Idempotent: if a |
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* token already exists it is reused, not rotated, so an already-attached |
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* hub keeps working. |
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* |
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* @return array<string,mixed> Public status including site_url + site_token. |
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*/ |
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public static function generate_token(): array { |
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if ( '' === Mcp_Pairing::site_token() ) { |
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// Mint (read-write by default) so the token exists to hand over. |
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Mcp_Pairing::connect( false ); |
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} |
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return self::public_status(); |
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} |
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|
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/** |
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* Method 2 (OAuth attach) — the one-click flow. |
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* |
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* The admin clicks "Connect via OAuth" in the Hub tab. We mint a |
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* short-lived signed nonce and redirect the browser to the hub's |
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* /attach page carrying { site_url, nonce }. The hub (after the user |
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* logs into their account) calls BACK to this site's |
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* /xspeed/v1/mcp/attach with the nonce; verify_attach_nonce() checks |
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* it and hands the hub the site_token. Because the nonce is HMAC-signed |
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* with this site's secret AND minting is admin-only, only a site admin |
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* can start an attach — no token is ever pasted or shown. |
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*/ |
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|
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/** Nonce validity window (seconds). */ |
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private const NONCE_TTL = 600; |
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|
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/** Per-site signing secret for attach nonces (derived from WP salts). */ |
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private static function nonce_secret(): string { |
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return wp_hash( 'xspeed_hub_attach|' . self::site_url_canonical() ); |
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} |
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|
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/** Canonical site URL used in the nonce + sent to the hub. */ |
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private static function site_url_canonical(): string { |
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return untrailingslashit( home_url( '/' ) ); |
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} |
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|
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/** |
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* Mint a signed, time-bound attach nonce. Format: <ts>.<uid>.<hmac>. |
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* Admin-only (the REST route that calls this is gated by manage_options). |
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* The minting admin's user ID is embedded so the (WP-userless) attach |
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* callback can record the connection PER-USER — each admin sees their own |
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* "Connected via <their account>" status. |
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*/ |
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public static function mint_attach_nonce(): string { |
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// Ensure a site_token exists to hand over on the callback. |
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if ( '' === Mcp_Pairing::site_token() ) { |
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Mcp_Pairing::connect( false ); |
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} |
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$ts = time(); |
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$uid = get_current_user_id(); |
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$hmac = hash_hmac( 'sha256', $ts . '.' . $uid, self::nonce_secret() ); |
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return $ts . '.' . $uid . '.' . $hmac; |
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} |
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|
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/** |
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* Verify an attach nonce (constant-time, within TTL). On success returns |
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* the paste-in values (site_url + site_token) plus the minting admin's |
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* user ID; on failure returns null. Called by the token-authless |
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* /mcp/attach route. |
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* |
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* @return array{site_url:string,site_token:string,user_id:int}|null |
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*/ |
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public static function verify_attach_nonce( string $nonce ): ?array { |
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$parts = explode( '.', $nonce, 3 ); |
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if ( 3 !== count( $parts ) ) { |
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return null; |
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} |
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list( $ts, $uid, $hmac ) = $parts; |
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if ( ! ctype_digit( (string) $ts ) || ! ctype_digit( (string) $uid ) ) { |
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return null; |
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} |
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if ( abs( time() - (int) $ts ) > self::NONCE_TTL ) { |
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return null; // expired |
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} |
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$expected = hash_hmac( 'sha256', $ts . '.' . $uid, self::nonce_secret() ); |
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if ( ! hash_equals( $expected, (string) $hmac ) ) { |
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return null; // bad signature |
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} |
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return array( |
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'site_url' => self::site_url_canonical(), |
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'site_token' => Mcp_Pairing::site_token(), |
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'user_id' => (int) $uid, |
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); |
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} |
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|
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/** |
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* The URL to redirect the admin to for OAuth attach. Carries the site |
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* URL + a fresh nonce; the hub reads these, logs the user in, and calls |
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* back to confirm. |
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*/ |
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/** |
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* Self-heal: ask the Hub whether THIS site (by its own token) is attached, |
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* and reconcile the local per-user state. This makes the "Connected" badge |
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* reliable even if the attach callback never fired (failed/slow/cached) — |
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* the Hub is the source of truth. Cached in a short transient so the panel |
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* doesn't make an outbound call on every render. |
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* |
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* @param bool $force Skip the cache (e.g. right after a Connect attempt). |
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*/ |
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public static function reconcile_with_hub( bool $force = false ): void { |
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$token = Mcp_Pairing::site_token(); |
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if ( '' === $token ) { |
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return; // no token minted yet → definitely not attached |
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} |
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|
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$cache_key = 'xspeed_hub_reconcile'; |
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if ( ! $force && false !== get_transient( $cache_key ) ) { |
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return; // reconciled recently |
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} |
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|
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$url = add_query_arg( |
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array( 'site_url' => rawurlencode( self::site_url_canonical() ) ), |
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self::hub_url() . '/api/site/attached' |
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); |
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$resp = wp_remote_get( |
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$url, |
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array( |
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'timeout' => 8, |
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'headers' => array( 'X-XSpeed-Site-Token' => $token ), |
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) |
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); |
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// Cache for 5 min regardless — don't hammer the Hub on transient errors. |
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set_transient( $cache_key, 1, 5 * MINUTE_IN_SECONDS ); |
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|
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if ( is_wp_error( $resp ) || 200 !== wp_remote_retrieve_response_code( $resp ) ) { |
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return; // leave local state as-is on any error |
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} |
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$body = json_decode( (string) wp_remote_retrieve_body( $resp ), true ); |
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if ( ! is_array( $body ) ) { |
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return; |
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} |
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|
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$uid = get_current_user_id(); |
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if ( ! empty( $body['attached'] ) ) { |
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// The Hub says attached — mark THIS admin connected if not already. |
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$state = self::state( $uid ); |
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if ( empty( $state['attached'] ) ) { |
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self::mark_attached( (string) ( $body['account_email'] ?? '' ), $uid ); |
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} |
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} elseif ( $uid ) { |
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// The Hub says NOT attached (e.g. removed on the dashboard) — clear |
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// any stale local "connected" so the badge doesn't lie. |
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$state = self::state( $uid ); |
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if ( ! empty( $state['attached'] ) ) { |
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delete_user_meta( $uid, self::USER_META ); |
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} |
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} |
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} |
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|
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public static function attach_url(): string { |
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$args = array( |
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'site_url' => self::site_url_canonical(), |
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'nonce' => self::mint_attach_nonce(), |
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); |
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// Prefill hint only — the current admin's email, so a brand-new user |
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// can create/sign into their Hub account in one click without typing. |
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// The Hub NEVER trusts this for auth; it only pre-populates the field |
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// and still requires the user to verify (magic-link / Google). |
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$email = self::current_admin_email(); |
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if ( '' !== $email ) { |
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$args['email'] = $email; |
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} |
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return self::hub_url() . '/attach?' . http_build_query( $args ); |
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} |
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|
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/** The logged-in admin's email (used only as a Hub sign-in prefill hint). */ |
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private static function current_admin_email(): string { |
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$user = wp_get_current_user(); |
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if ( $user && ! empty( $user->user_email ) && is_email( $user->user_email ) ) { |
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return (string) $user->user_email; |
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} |
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$admin = get_option( 'admin_email' ); |
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return is_string( $admin ) && is_email( $admin ) ? $admin : ''; |
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} |
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|
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/** |
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* Record that this site is attached to a hub account, PER USER. Called |
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* from the attach callback with the minting admin's user id (from the |
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* nonce), so each admin gets their own status. Bookkeeping only. |
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* |
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* @param string $account_email The hub account the site was attached to. |
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* @param int|null $user_id The admin who attached (defaults to current). |
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*/ |
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public static function mark_attached( string $account_email, ?int $user_id = null ): array { |
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$user_id = $user_id ?? get_current_user_id(); |
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if ( $user_id ) { |
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update_user_meta( |
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$user_id, |
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self::USER_META, |
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array( |
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'attached' => true, |
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'account_email' => sanitize_email( $account_email ), |
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'attached_at' => time(), |
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) |
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); |
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} |
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// Bust the reconcile cache so a reconnect reflects immediately (not the |
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// stale 'not attached' cached during the disconnected window). |
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delete_transient( 'xspeed_hub_reconcile' ); |
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return self::public_status( $user_id ); |
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} |
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|
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/** |
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* Disconnect the CURRENT admin from the hub: clear their per-user link. |
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* Other admins' connections are untouched. Does NOT rotate the site_token |
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* (still used by the per-site connection); to fully cut off the hub the |
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* user rotates the token, which the Hub's stored copy then fails on. |
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*/ |
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public static function disconnect(): array { |
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$user_id = get_current_user_id(); |
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$state = $user_id ? self::state( $user_id ) : array(); |
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$email = isset( $state['account_email'] ) ? (string) $state['account_email'] : ''; |
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|
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// Detach from the Hub for THIS admin's account only (multi-admin: other |
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// admins who attached keep their link). The site token proves ownership; |
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// account_email scopes the removal. |
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$token = Mcp_Pairing::site_token(); |
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if ( '' !== $token && '' !== $email ) { |
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wp_remote_post( |
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self::hub_url() . '/api/site/detach', |
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array( |
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'timeout' => 8, |
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'headers' => array( |
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'Content-Type' => 'application/json', |
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'X-XSpeed-Site-Token' => $token, |
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), |
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'body' => wp_json_encode( |
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array( |
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'site_url' => self::site_url_canonical(), |
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'account_email' => $email, |
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) |
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), |
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) |
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); |
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} |
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|
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if ( $user_id ) { |
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delete_user_meta( $user_id, self::USER_META ); |
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} |
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// Bust the reconcile cache so the next status read reflects reality |
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// immediately (not the stale 'attached' cached before disconnect). |
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delete_transient( 'xspeed_hub_reconcile' ); |
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return self::public_status( $user_id ); |
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} |
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} |
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|
