| 1 |
<?php |
| 2 |
|
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/** |
| 4 |
* The consent screen an OAuth client sends the user to. |
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*/ |
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|
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namespace Extendify\Mcp\OAuth; |
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|
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defined('ABSPATH') || die('No direct access.'); |
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|
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use Extendify\Mcp\Allowed; |
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use Extendify\Mcp\Availability; |
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use Extendify\Mcp\Grants; |
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use Extendify\Mcp\Profile; |
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use Extendify\PartnerData; |
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|
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/** |
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* A hidden wp-admin page, so WordPress's own login does the authenticating. |
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* |
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* An invalid request is explained here and never redirected: the return |
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* address is the thing that could not be trusted. |
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*/ |
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class Authorize |
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{ |
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// phpcs:disable PSR12.Properties.ConstantVisibility.NotFound |
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const NONCE = 'extendify_mcp_authorize'; |
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|
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const APPROVE = 'approve'; |
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|
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const STYLE = 'extendify-mcp-authorize'; |
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// phpcs:enable PSR12.Properties.ConstantVisibility.NotFound |
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|
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/** |
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* @return void |
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*/ |
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public static function register() |
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{ |
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\add_action('admin_menu', [self::class, 'registerPage']); |
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\add_action('admin_init', [self::class, 'handleDecision']); |
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} |
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|
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/** |
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* Open to every signed-in user, so a non-administrator is told who can |
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* approve instead of seeing WordPress's "not allowed" page. |
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* |
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* @return void |
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*/ |
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public static function registerPage() |
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{ |
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$hook = \add_submenu_page( |
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'', |
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\__('Connect an AI assistant', 'extendify-local'), |
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\__('Connect an AI assistant', 'extendify-local'), |
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'read', |
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Metadata::AUTHORIZE_PAGE, |
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[self::class, 'renderPage'] |
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); |
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if ($hook) { |
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\add_action('load-' . $hook, [self::class, 'clearPage']); |
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} |
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} |
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|
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/** |
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* Access is granted here, so no plugin's notice, widget or script may sit beside Approve. |
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* |
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* @return void |
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*/ |
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public static function clearPage() |
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{ |
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$hooks = [ |
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'admin_notices', |
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'all_admin_notices', |
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'user_admin_notices', |
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'network_admin_notices', |
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'in_admin_footer', |
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'admin_footer', |
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]; |
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foreach ($hooks as $hook) { |
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\remove_all_actions($hook); |
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} |
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|
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Profile::quietNotices(); |
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\add_filter('print_scripts_array', function (array $handles) { |
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return self::coreOnly($handles, \wp_scripts()); |
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}); |
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\add_filter('print_styles_array', function (array $handles) { |
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return self::coreOnly($handles, \wp_styles()); |
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}); |
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} |
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|
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/** |
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* Core registers its assets by site-relative path; a plugin's carry a URL. |
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* |
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* @param array $handles - The handles about to print. |
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* @param \WP_Dependencies $registry - The scripts or styles they are registered with. |
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* @return array |
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*/ |
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private static function coreOnly(array $handles, \WP_Dependencies $registry) |
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{ |
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return array_values(array_filter($handles, function ($handle) use ($registry) { |
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if ($handle === self::STYLE) { |
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return true; |
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} |
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|
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$src = $registry->registered[$handle]->src ?? ''; |
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|
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return is_string($src) && preg_match('#^/wp-(admin|includes)/#', $src) === 1; |
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})); |
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} |
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|
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/** |
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* @return void |
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*/ |
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public static function handleDecision() |
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{ |
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended |
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$page = \sanitize_key(\wp_unslash($_GET['page'] ?? '')); |
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// phpcs:ignore WordPress.Security.NonceVerification.Missing |
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if ($page !== Metadata::AUTHORIZE_PAGE || !isset($_POST['extendify_mcp_decision'])) { |
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return; |
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} |
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|
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// Without the nonce, any page the administrator visits could post an approval as them. |
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\check_admin_referer(self::NONCE); |
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$decision = \sanitize_key(\wp_unslash($_POST['extendify_mcp_decision'])); |
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$scope = \sanitize_key(\wp_unslash($_POST['extendify_mcp_scope'] ?? '')); |
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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- validate() accepts nothing it has not checked. |
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$params = \wp_unslash($_GET); |
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$back = $decision === self::APPROVE ? self::approve($params, $scope) : self::deny($params); |
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if (!$back) { |
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return; |
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} |
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|
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// phpcs:ignore WordPress.Security.SafeRedirect.wp_redirect_wp_redirect -- The address is the client's own, checked against its document. |
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\wp_redirect($back); |
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exit; |
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} |
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|
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/** |
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* @return void |
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*/ |
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public static function renderPage() |
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{ |
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// phpcs:ignore WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized |
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self::render(\wp_unslash($_GET)); |
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} |
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|
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/** |
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* @param array $params - The authorization request, as sent. |
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* @return void |
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*/ |
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public static function render(array $params) |
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{ |
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\wp_register_style(self::STYLE, false, [], false); |
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\wp_enqueue_style(self::STYLE); |
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\wp_add_inline_style(self::STYLE, self::styles()); |
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|
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echo '<div class="wrap extendify-mcp-wrap extendify-mcp-authorize">'; |
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Profile::renderBand( |
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/* translators: MCP is a protocol name; keep it in English. */ |
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\__('MCP', 'extendify-local'), |
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\__('Connect an AI assistant', 'extendify-local') |
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); |
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echo '<div class="extendify-mcp-page"><div class="extendify-mcp-consent">'; |
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self::renderBody($params); |
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echo '</div></div></div>'; |
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} |
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|
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/** |
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* @param array $params - The authorization request, as sent. |
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* @param string $scope - The access the user chose. |
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* @return string|null - Where to send the client, or null when the request does not stand. |
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*/ |
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public static function approve(array $params, $scope) |
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{ |
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$request = self::allowed($params); |
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if (!$request) { |
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return null; |
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} |
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|
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$write = $scope === Grants::WRITE && self::writeOffered($request); |
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$code = Tokens::mintCode([ |
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'userId' => \get_current_user_id(), |
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'client' => $request['client']['id'], |
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'label' => $request['client']['name'], |
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'redirectUri' => $request['redirectUri'], |
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'codeChallenge' => $request['codeChallenge'], |
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'grants' => $write ? Grants::names() : [Grants::READ], |
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'offline' => $request['offline'], |
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'resource' => Metadata::resource(), |
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]); |
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|
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return self::back($request, ['code' => $code]); |
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} |
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|
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/** |
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* @param array $params - The authorization request, as sent. |
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* @return string|null - Where to send the client, or null when the request does not stand. |
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*/ |
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public static function deny(array $params) |
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{ |
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$request = self::allowed($params); |
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|
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return $request ? self::back($request, ['error' => 'access_denied']) : null; |
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} |
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|
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/** |
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* @param array $params - The authorization request, as sent. |
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* @return array|null |
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*/ |
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private static function allowed(array $params) |
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{ |
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// Without this, any signed-in user could hand an assistant access to the site. |
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if (!Availability::live() || !\current_user_can('manage_options')) { |
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return null; |
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} |
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|
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$request = self::validate($params); |
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|
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return \is_wp_error($request) ? null : $request; |
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} |
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|
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/** |
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* @param array $params - The authorization request, as sent. |
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* @return array|\WP_Error |
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*/ |
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private static function validate(array $params) |
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{ |
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$sent = function ($key) use ($params) { |
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return is_string($params[$key] ?? null) ? $params[$key] : ''; |
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}; |
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|
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if ($sent('response_type') !== 'code') { |
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return self::refused(\__('The request from the assistant is incomplete or malformed.', 'extendify-local')); |
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} |
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|
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$client = Clients::find($sent('client_id')); |
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if (!$client) { |
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return self::refused(\__( |
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'The assistant could not be identified. Its identity document is missing or does not name it.', |
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'extendify-local' |
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)); |
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} |
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|
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$redirect = Clients::redirect($client, $sent('redirect_uri')); |
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if ($redirect === null) { |
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return self::refused(\__( |
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'The assistant asked to be sent back to an address it did not register.', |
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'extendify-local' |
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)); |
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} |
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|
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$challenge = $sent('code_challenge'); |
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if ($sent('code_challenge_method') !== 'S256' || !preg_match('/^[A-Za-z0-9._~-]{43,128}$/', $challenge)) { |
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return self::refused(\__('The request is missing the code challenge that protects it.', 'extendify-local')); |
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} |
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|
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if (!Metadata::isResource($sent('resource'))) { |
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return self::refused(\__('The request is for a different site or endpoint.', 'extendify-local')); |
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} |
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|
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return [ |
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'client' => $client, |
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'redirectUri' => $redirect, |
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'codeChallenge' => $challenge, |
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'state' => $sent('state'), |
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'grants' => Grants::fromScope($sent('scope')), |
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'offline' => in_array('offline_access', preg_split('/\s+/', trim($sent('scope'))), true), |
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]; |
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} |
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|
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/** |
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* @param string $message - What to tell the user. |
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* @return \WP_Error |
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*/ |
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private static function refused($message) |
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{ |
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return new \WP_Error('extendify_mcp_invalid_request', $message); |
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} |
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|
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/** |
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* @param array $request - The validated request. |
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* @return boolean |
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*/ |
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private static function writeOffered(array $request) |
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{ |
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return in_array(Grants::WRITE, $request['grants'], true) && Allowed::writable(); |
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} |
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|
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/** |
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* @param array $request - The validated request. |
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* @param array $answer - The parameters to send back. |
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* @return string |
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*/ |
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private static function back(array $request, array $answer) |
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{ |
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$answer['iss'] = Metadata::issuer(); |
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if ($request['state'] !== '') { |
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$answer['state'] = $request['state']; |
| 300 |
} |
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|
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// add_query_arg encodes nothing it is handed. |
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return \add_query_arg(array_map('rawurlencode', $answer), $request['redirectUri']); |
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} |
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|
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/** |
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* @param array $params - The authorization request, as sent. |
| 308 |
* @return void |
| 309 |
*/ |
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private static function renderBody(array $params) |
| 311 |
{ |
| 312 |
if (!Availability::live()) { |
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self::renderOff(); |
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return; |
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} |
| 316 |
|
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if (!\current_user_can('manage_options')) { |
| 318 |
printf('<p>%s</p>', \esc_html(sprintf( |
| 319 |
/* translators: %s: the signed-in user's name. */ |
| 320 |
\__( |
| 321 |
'Only an administrator can connect an AI assistant to this site. You are signed in as %s.', |
| 322 |
'extendify-local' |
| 323 |
), |
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\wp_get_current_user()->display_name |
| 325 |
))); |
| 326 |
return; |
| 327 |
} |
| 328 |
|
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$request = self::validate($params); |
| 330 |
if (\is_wp_error($request)) { |
| 331 |
printf( |
| 332 |
'<div class="notice notice-error inline"><p>%1$s</p></div><p>%2$s</p>', |
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\esc_html($request->get_error_message()), |
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\esc_html__('Nothing was sent back to the assistant. Try connecting again from it.', 'extendify-local') |
| 335 |
); |
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return; |
| 337 |
} |
| 338 |
|
| 339 |
self::renderConsent($request); |
| 340 |
} |
| 341 |
|
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/** |
| 343 |
* @return void |
| 344 |
*/ |
| 345 |
private static function renderOff() |
| 346 |
{ |
| 347 |
if (!Availability::turnedOff()) { |
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echo '<p>' |
| 349 |
. \esc_html__('This site does not offer connections to AI assistants.', 'extendify-local') |
| 350 |
. '</p>'; |
| 351 |
return; |
| 352 |
} |
| 353 |
|
| 354 |
printf('<p>%s</p>', \esc_html__( |
| 355 |
'Connections are turned off for the whole site, so no assistant can connect right now.', |
| 356 |
'extendify-local' |
| 357 |
)); |
| 358 |
|
| 359 |
if (!\current_user_can('manage_options')) { |
| 360 |
return; |
| 361 |
} |
| 362 |
|
| 363 |
printf( |
| 364 |
'<p><a class="button" href="%1$s">%2$s</a></p>', |
| 365 |
\esc_url(\admin_url('options-general.php?page=' . Profile::PAGE)), |
| 366 |
\esc_html__('Open MCP settings', 'extendify-local') |
| 367 |
); |
| 368 |
} |
| 369 |
|
| 370 |
/** |
| 371 |
* @param array $request - The validated request. |
| 372 |
* @return void |
| 373 |
*/ |
| 374 |
private static function renderConsent(array $request) |
| 375 |
{ |
| 376 |
$user = \wp_get_current_user(); |
| 377 |
$client = $request['client']; |
| 378 |
|
| 379 |
printf('<p class="extendify-mcp-ask">%s</p>', \wp_kses(sprintf( |
| 380 |
/* translators: 1: the AI assistant's name. 2: the site's name. 3: the user's name. 4: their username. |
| 381 |
If the grammar needs a case a name can't take, add a word like "site" or "user" before the name. */ |
| 382 |
\__('<strong>%1$s</strong> wants to work on %2$s as %3$s (%4$s).', 'extendify-local'), |
| 383 |
\esc_html($client['name']), |
| 384 |
\esc_html(\wp_specialchars_decode(\get_option('blogname'), ENT_QUOTES)), |
| 385 |
\esc_html($user->display_name), |
| 386 |
\esc_html($user->user_login) |
| 387 |
), ['strong' => []])); |
| 388 |
|
| 389 |
echo '<form method="post">'; |
| 390 |
\wp_nonce_field(self::NONCE); |
| 391 |
self::renderAccess($request); |
| 392 |
|
| 393 |
printf('<p class="description">%s</p>', \esc_html(sprintf( |
| 394 |
/* translators: %s: a website's host name, such as claude.ai. */ |
| 395 |
\__('You will be sent back to %s.', 'extendify-local'), |
| 396 |
(string) \wp_parse_url($request['redirectUri'], PHP_URL_HOST) |
| 397 |
))); |
| 398 |
|
| 399 |
if (Clients::onThisComputerOnly($client)) { |
| 400 |
printf( |
| 401 |
'<div class="notice notice-warning inline"><p>%1$s %2$s</p></div>', |
| 402 |
\esc_html__( |
| 403 |
'This assistant runs on your own computer, and any program there could present itself as it.', |
| 404 |
'extendify-local' |
| 405 |
), |
| 406 |
\esc_html__('Approve only if you started this from a program you trust.', 'extendify-local') |
| 407 |
); |
| 408 |
} |
| 409 |
|
| 410 |
printf( |
| 411 |
'<p class="extendify-mcp-decide">' |
| 412 |
. '<button type="submit" class="button button-primary" name="extendify_mcp_decision"' |
| 413 |
. ' value="%1$s">%2$s</button>' |
| 414 |
. '<button type="submit" class="button" name="extendify_mcp_decision" value="deny">%3$s</button>' |
| 415 |
. '</p></form>', |
| 416 |
\esc_attr(self::APPROVE), |
| 417 |
\esc_html__('Approve', 'extendify-local'), |
| 418 |
\esc_html__('Deny', 'extendify-local') |
| 419 |
); |
| 420 |
} |
| 421 |
|
| 422 |
/** |
| 423 |
* @param array $request - The validated request. |
| 424 |
* @return void |
| 425 |
*/ |
| 426 |
private static function renderAccess(array $request) |
| 427 |
{ |
| 428 |
if (!self::writeOffered($request)) { |
| 429 |
printf('<p class="extendify-mcp-access">%s</p>', \esc_html(Grants::label([Grants::READ]))); |
| 430 |
return; |
| 431 |
} |
| 432 |
|
| 433 |
echo '<fieldset class="extendify-mcp-access"><legend class="screen-reader-text">' |
| 434 |
. \esc_html__('Access', 'extendify-local') . '</legend>'; |
| 435 |
foreach ([Grants::READ => [Grants::READ], Grants::WRITE => Grants::names()] as $value => $grants) { |
| 436 |
printf( |
| 437 |
'<label><input type="radio" name="extendify_mcp_scope" value="%1$s"%2$s> %3$s</label>', |
| 438 |
\esc_attr($value), |
| 439 |
$value === Grants::READ ? ' checked' : '', |
| 440 |
\esc_html(Grants::label($grants)) |
| 441 |
); |
| 442 |
} |
| 443 |
|
| 444 |
echo '</fieldset>'; |
| 445 |
} |
| 446 |
|
| 447 |
/** |
| 448 |
* Plugin styles are held off this page, so it sets the partner's colours itself. |
| 449 |
* |
| 450 |
* @return string |
| 451 |
*/ |
| 452 |
public static function styles() |
| 453 |
{ |
| 454 |
$colors = []; |
| 455 |
foreach (PartnerData::cssVariableMapping() as $variable => $value) { |
| 456 |
$colors[] = $variable . ': ' . $value; |
| 457 |
} |
| 458 |
|
| 459 |
return \wp_strip_all_tags(':root { ' . implode('; ', $colors) . '; }') . ' |
| 460 |
' . Profile::frameStyles('admin_page_' . Metadata::AUTHORIZE_PAGE) . ' |
| 461 |
.extendify-mcp-consent { max-width: 480px; margin: var(--wpds-dimension-gap-2xl, 24px) auto 0; padding: 24px; |
| 462 |
background: var(--wpds-color-background-surface-neutral-strong, #fff); |
| 463 |
border: 1px solid var(--wpds-color-stroke-surface-neutral, #dcdcde); |
| 464 |
border-radius: var(--wpds-border-radius-lg, 8px); } |
| 465 |
.extendify-mcp-consent > :first-child { margin-top: 0; } |
| 466 |
.extendify-mcp-authorize .extendify-mcp-access label { display: block; margin: 6px 0; } |
| 467 |
.extendify-mcp-authorize .extendify-mcp-decide { display: flex; gap: 8px; margin: 16px 0 0; }'; |
| 468 |
} |
| 469 |
} |
| 470 |
|
