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| 1 | <?php |
| 2 | /** |
| 3 | * WPCOM REST API v2 endpoints for the PayPal Payment Buttons platform integration. |
| 4 | * |
| 5 | * Automattic's PayPal platform credentials (client_id/client_secret) stay |
| 6 | * server-side and never ship in the plugin. The site creates its Partner |
| 7 | * Referral here, looks up the seller it referred here and, because a |
| 8 | * THIRD_PARTY seller holds no credentials of their own, makes every Payment |
| 9 | * Links & Buttons call here as well. |
| 10 | * |
| 11 | * Plugin side: PayPal_Partner_Onboarding and PayPal_Platform_Client call these |
| 12 | * routes via Client::wpcom_json_api_request_as_blog(). |
| 13 | * |
| 14 | * @package automattic/jetpack-mu-wpcom |
| 15 | * @since $$next-version$$ |
| 16 | * @see https://developer.paypal.com/docs/multiparty/seller-onboarding/build-onboarding/ |
| 17 | */ |
| 18 | |
| 19 | use Automattic\Jetpack\Constants; |
| 20 | use Automattic\Jetpack\Feature_Flags\Feature_Flags; |
| 21 | |
| 22 | if ( ! defined( 'ABSPATH' ) ) { |
| 23 | exit( 0 ); |
| 24 | } |
| 25 | |
| 26 | /** |
| 27 | * PayPal platform: Partner Referrals signup links, merchant lookups, and |
| 28 | * Payment Links & Buttons calls made on a referred seller's behalf. |
| 29 | * |
| 30 | * @since $$next-version$$ |
| 31 | */ |
| 32 | class WPCOM_REST_API_V2_Endpoint_PayPal_Onboarding extends WP_REST_Controller { |
| 33 | |
| 34 | /** |
| 35 | * PayPal production API base URL. |
| 36 | * |
| 37 | * @var string |
| 38 | */ |
| 39 | const PAYPAL_PRODUCTION_BASE_URL = 'https://api.paypal.com'; |
| 40 | |
| 41 | /** |
| 42 | * PayPal sandbox API base URL. |
| 43 | * |
| 44 | * @var string |
| 45 | */ |
| 46 | const PAYPAL_SANDBOX_BASE_URL = 'https://api-m.sandbox.paypal.com'; |
| 47 | |
| 48 | /** |
| 49 | * PayPal Partner Referrals API endpoint. |
| 50 | * |
| 51 | * @var string |
| 52 | */ |
| 53 | const PAYPAL_REFERRALS_ENDPOINT = '/v2/customer/partner-referrals'; |
| 54 | |
| 55 | /** |
| 56 | * PayPal OAuth token endpoint. |
| 57 | * |
| 58 | * @var string |
| 59 | */ |
| 60 | const PAYPAL_TOKEN_ENDPOINT = '/v1/oauth2/token'; |
| 61 | |
| 62 | /** |
| 63 | * Merchant integrations endpoint template. Replace {partner_id} at call time. |
| 64 | * |
| 65 | * @var string |
| 66 | */ |
| 67 | const PAYPAL_MERCHANT_INTEGRATIONS_ENDPOINT = '/v1/customer/partners/%s/merchant-integrations'; |
| 68 | |
| 69 | /** |
| 70 | * The one PayPal API the site may call on a seller's behalf. |
| 71 | * |
| 72 | * @var string |
| 73 | */ |
| 74 | const PAYPAL_PAYMENT_RESOURCES_ENDPOINT = '/v1/checkout/payment-resources'; |
| 75 | |
| 76 | /** |
| 77 | * Products to request during onboarding. |
| 78 | * |
| 79 | * @var array |
| 80 | */ |
| 81 | const ONBOARDING_PRODUCTS = array( 'EXPRESS_CHECKOUT' ); |
| 82 | |
| 83 | /** |
| 84 | * Permissions the seller grants the platform during onboarding. |
| 85 | * |
| 86 | * PAYMENT_LINKS_AND_BUTTONS is the one that covers /v1/checkout/payment-resources, |
| 87 | * the endpoint every button is created through. Neither EXPRESS_CHECKOUT |
| 88 | * nor PPCP includes it, and PayPal does not document the valid feature |
| 89 | * values, so it has to be requested by name. |
| 90 | * |
| 91 | * @var array |
| 92 | */ |
| 93 | const ONBOARDING_FEATURES = array( 'PAYMENT', 'REFUND', 'ACCESS_MERCHANT_INFORMATION', 'PAYMENT_LINKS_AND_BUTTONS' ); |
| 94 | |
| 95 | /** |
| 96 | * Prefix of every tracking ID this endpoint issues; the blog ID follows it. |
| 97 | * |
| 98 | * @var string |
| 99 | */ |
| 100 | const TRACKING_ID_PREFIX = 'woo-ncps-'; |
| 101 | |
| 102 | /** |
| 103 | * How long a verified blog-to-merchant binding is remembered, in seconds. |
| 104 | * |
| 105 | * @var int |
| 106 | */ |
| 107 | const MERCHANT_BINDING_TTL = 12 * HOUR_IN_SECONDS; |
| 108 | |
| 109 | /** |
| 110 | * Seconds taken off a platform token's lifetime before it is refreshed. |
| 111 | * |
| 112 | * @var int |
| 113 | */ |
| 114 | const TOKEN_EXPIRY_BUFFER = 300; |
| 115 | |
| 116 | /** |
| 117 | * Names of the constants holding Automattic's PayPal platform credentials, by environment. |
| 118 | * |
| 119 | * The values themselves live in WordPress.com's secrets configuration. Only the |
| 120 | * constant *names* are stored here: referencing an undefined constant inside a |
| 121 | * constant expression is a fatal error, and these are never defined on self-hosted |
| 122 | * sites, where onboarding is proxied to WordPress.com instead. Read them through |
| 123 | * get_platform_credentials(), which tolerates their absence. |
| 124 | * |
| 125 | * @var array<string, array<string, string>> |
| 126 | */ |
| 127 | const PLATFORM_CREDENTIAL_CONSTANTS = array( |
| 128 | 'production' => array( |
| 129 | 'client_id' => 'PAYPAL_BUTTONS_PRODUCTION_CLIENT_ID', |
| 130 | 'client_secret' => 'PAYPAL_BUTTONS_PRODUCTION_CLIENT_SECRET', |
| 131 | 'partner_merchant_id' => 'PAYPAL_BUTTONS_PRODUCTION_PARTNER_MERCHANT_ID', |
| 132 | ), |
| 133 | 'sandbox' => array( |
| 134 | 'client_id' => 'PAYPAL_BUTTONS_SANDBOX_CLIENT_ID', |
| 135 | 'client_secret' => 'PAYPAL_BUTTONS_SANDBOX_CLIENT_SECRET', |
| 136 | 'partner_merchant_id' => 'PAYPAL_BUTTONS_SANDBOX_PARTNER_MERCHANT_ID', |
| 137 | ), |
| 138 | ); |
| 139 | |
| 140 | /** |
| 141 | * Constructor. |
| 142 | */ |
| 143 | public function __construct() { |
| 144 | $this->namespace = 'wpcom/v2'; |
| 145 | |
| 146 | /* |
| 147 | * 'paypal/platform', not 'paypal/onboarding': the package registers the |
| 148 | * editor-facing wpcom/v2/paypal/onboarding/signup-link on every host that |
| 149 | * runs it, including this one. Sharing the path would mean two classes |
| 150 | * claiming one route, and the site proxying to itself. |
| 151 | */ |
| 152 | $this->rest_base = 'paypal/platform'; |
| 153 | |
| 154 | /* |
| 155 | * Opt out of WordPress.com's centralize.php rewrite, which otherwise moves every |
| 156 | * wpcom/v2 route to /wpcom/v2/sites/<site>/... . Client::wpcom_json_api_request_as_blog() |
| 157 | * builds a flat /wpcom/v2/<path> URL -- the blog ID travels as a signed argument, not |
| 158 | * in the path -- so a rewritten route is unreachable from it and every call came back |
| 159 | * rest_no_route. |
| 160 | * |
| 161 | * A flat route runs on public-api's own blog, so the current blog never names the |
| 162 | * caller: site_id() reads it from the signed blog token instead. |
| 163 | * |
| 164 | * The wpcom-only flag stops public-api's proxy_jetpack() from forwarding the call |
| 165 | * to a Jetpack site and answering rest_not_implemented, which is right here: the |
| 166 | * credentials are Automattic's and live on WordPress.com servers. A false |
| 167 | * site_specific already implies wpcom-only, but both are set explicitly -- as |
| 168 | * WPCOM_REST_API_V2_Endpoint_Following does -- so neither relies on the other's |
| 169 | * side effect. |
| 170 | */ |
| 171 | $this->wpcom_is_wpcom_only_endpoint = true; |
| 172 | $this->wpcom_is_site_specific_endpoint = false; |
| 173 | |
| 174 | add_action( 'rest_api_init', array( $this, 'register_routes' ) ); |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * Register REST API routes. |
| 179 | */ |
| 180 | public function register_routes() { |
| 181 | // Hard-coded: mu-wpcom cannot reach PayPal_Payment_Buttons::API_MANAGED_BUTTONS_FLAG. |
| 182 | // Unregistered here, so only a `jetpack_feature_flag_enabled_*` filter flips it on wpcom. |
| 183 | if ( ! Feature_Flags::is_enabled( 'paypal-payments-api-managed-buttons' ) ) { |
| 184 | return; |
| 185 | } |
| 186 | |
| 187 | $environment_arg = array( |
| 188 | 'required' => true, |
| 189 | 'type' => 'string', |
| 190 | 'enum' => array( 'sandbox', 'production' ), |
| 191 | 'sanitize_callback' => 'sanitize_text_field', |
| 192 | 'description' => 'PayPal environment: sandbox or production.', |
| 193 | ); |
| 194 | |
| 195 | $merchant_id_arg = array( |
| 196 | 'type' => 'string', |
| 197 | 'sanitize_callback' => 'sanitize_text_field', |
| 198 | 'description' => 'The seller\'s PayPal merchant ID.', |
| 199 | ); |
| 200 | |
| 201 | register_rest_route( |
| 202 | $this->namespace, |
| 203 | $this->rest_base . '/signup-link', |
| 204 | array( |
| 205 | array( |
| 206 | 'methods' => WP_REST_Server::CREATABLE, |
| 207 | 'callback' => array( $this, 'generate_signup_link' ), |
| 208 | 'permission_callback' => array( $this, 'permission_check' ), |
| 209 | 'args' => array( |
| 210 | 'environment' => $environment_arg, |
| 211 | 'return_url' => array( |
| 212 | 'required' => true, |
| 213 | 'type' => 'string', |
| 214 | 'validate_callback' => array( $this, 'validate_return_url' ), |
| 215 | 'sanitize_callback' => 'esc_url_raw', |
| 216 | 'description' => 'The site page PayPal sends the seller back to.', |
| 217 | ), |
| 218 | 'partner_attribution_id' => array( |
| 219 | 'type' => 'string', |
| 220 | 'sanitize_callback' => array( $this, 'sanitize_partner_attribution_id' ), |
| 221 | 'description' => 'The partner attribution (BN) code the site resolved for its environment.', |
| 222 | ), |
| 223 | ), |
| 224 | ), |
| 225 | ) |
| 226 | ); |
| 227 | |
| 228 | register_rest_route( |
| 229 | $this->namespace, |
| 230 | $this->rest_base . '/merchant-integration', |
| 231 | array( |
| 232 | array( |
| 233 | 'methods' => WP_REST_Server::READABLE, |
| 234 | 'callback' => array( $this, 'get_merchant_integration_status' ), |
| 235 | 'permission_callback' => array( $this, 'permission_check' ), |
| 236 | 'args' => array( |
| 237 | 'environment' => $environment_arg, |
| 238 | 'merchant_id' => $merchant_id_arg, |
| 239 | 'tracking_id' => array( |
| 240 | 'type' => 'string', |
| 241 | 'sanitize_callback' => 'sanitize_text_field', |
| 242 | 'description' => 'The tracking ID the referral was created with: to find a seller who just finished onboarding, or with a merchant ID, as proof the blog referred them.', |
| 243 | ), |
| 244 | ), |
| 245 | ), |
| 246 | ) |
| 247 | ); |
| 248 | |
| 249 | register_rest_route( |
| 250 | $this->namespace, |
| 251 | $this->rest_base . '/request', |
| 252 | array( |
| 253 | array( |
| 254 | 'methods' => WP_REST_Server::CREATABLE, |
| 255 | 'callback' => array( $this, 'forward_request' ), |
| 256 | 'permission_callback' => array( $this, 'permission_check' ), |
| 257 | 'args' => array( |
| 258 | 'environment' => $environment_arg, |
| 259 | 'merchant_id' => array_merge( $merchant_id_arg, array( 'required' => true ) ), |
| 260 | 'tracking_id' => array( |
| 261 | 'type' => 'string', |
| 262 | 'default' => '', |
| 263 | 'sanitize_callback' => 'sanitize_text_field', |
| 264 | 'description' => 'The tracking ID the blog onboarded the seller with, as proof it referred them.', |
| 265 | ), |
| 266 | 'method' => array( |
| 267 | 'required' => true, |
| 268 | 'type' => 'string', |
| 269 | 'enum' => array( 'GET', 'POST', 'PUT', 'DELETE' ), |
| 270 | 'description' => 'HTTP method of the PayPal call.', |
| 271 | ), |
| 272 | 'path' => array( |
| 273 | 'required' => true, |
| 274 | 'type' => 'string', |
| 275 | 'validate_callback' => array( $this, 'validate_path' ), |
| 276 | 'description' => 'PayPal API path, with any query string. Payment Links & Buttons only.', |
| 277 | ), |
| 278 | 'body' => array( |
| 279 | 'type' => array( 'object', 'null' ), |
| 280 | 'default' => null, |
| 281 | 'description' => 'JSON body for POST and PUT.', |
| 282 | ), |
| 283 | 'request_id' => array( |
| 284 | 'type' => 'string', |
| 285 | 'default' => '', |
| 286 | 'sanitize_callback' => 'sanitize_text_field', |
| 287 | 'description' => 'PayPal-Request-Id idempotency key.', |
| 288 | ), |
| 289 | ), |
| 290 | ), |
| 291 | ) |
| 292 | ); |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * Permission check — only a site that can be identified may call. |
| 297 | * |
| 298 | * @return true|WP_Error |
| 299 | */ |
| 300 | public function permission_check() { |
| 301 | if ( 0 === $this->site_id() ) { |
| 302 | return new WP_Error( |
| 303 | 'not_connected', |
| 304 | __( 'Site is not connected to WordPress.com.', 'jetpack-mu-wpcom' ), |
| 305 | array( 'status' => 403 ) |
| 306 | ); |
| 307 | } |
| 308 | return true; |
| 309 | } |
| 310 | |
| 311 | /** |
| 312 | * The calling blog's ID, or 0 when the request cannot be tied to one. |
| 313 | * |
| 314 | * The routes are flat, so the current blog is public-api's own for every HTTP |
| 315 | * caller; the Jetpack blog token the request is signed with names the site. |
| 316 | * |
| 317 | * @return int |
| 318 | */ |
| 319 | private function site_id() { |
| 320 | // Client::wpcom_json_api_request_as_blog() sets this on a Simple site's |
| 321 | // in-process call, which WPCOM_API_Direct runs switched to that site's blog. |
| 322 | if ( Constants::is_true( 'IS_WPCOM' ) && true === apply_filters( 'is_jetpack_authorized_for_site', false ) ) { |
| 323 | return get_current_blog_id(); |
| 324 | } |
| 325 | |
| 326 | if ( ! class_exists( 'Jetpack_Server_Version' ) ) { |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | // Checks the request signature against the token it names. |
| 331 | $token = Jetpack_Server_Version::get_token_from_authorization_header(); |
| 332 | if ( ! is_object( $token ) || is_wp_error( $token ) || empty( $token->blog_id ) ) { |
| 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | // A user token would let any of the site's users act as the site. |
| 337 | if ( ! empty( $token->user_id ) || ! empty( $token->external_user_id ) ) { |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | if ( function_exists( 'is_suspended' ) && is_suspended( $token->blog_id ) ) { |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | return (int) $token->blog_id; |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * Only a web page may be the return URL, and only over HTTPS in production. |
| 350 | * |
| 351 | * @param mixed $value The return_url parameter. |
| 352 | * @param WP_REST_Request $request The REST request. |
| 353 | * @return bool |
| 354 | */ |
| 355 | public function validate_return_url( $value, $request ) { |
| 356 | if ( ! is_string( $value ) ) { |
| 357 | return false; |
| 358 | } |
| 359 | |
| 360 | $scheme = wp_parse_url( $value, PHP_URL_SCHEME ); |
| 361 | $host = wp_parse_url( $value, PHP_URL_HOST ); |
| 362 | if ( ! is_string( $host ) || '' === $host ) { |
| 363 | return false; |
| 364 | } |
| 365 | |
| 366 | return 'production' === $request->get_param( 'environment' ) |
| 367 | ? 'https' === $scheme |
| 368 | : in_array( $scheme, array( 'http', 'https' ), true ); |
| 369 | } |
| 370 | |
| 371 | /** |
| 372 | * BN codes are alphanumeric with underscores and hyphens; anything else is dropped. |
| 373 | * |
| 374 | * @param mixed $value The partner_attribution_id parameter. |
| 375 | * @return string |
| 376 | */ |
| 377 | public function sanitize_partner_attribution_id( $value ) { |
| 378 | return is_string( $value ) ? preg_replace( '/[^A-Za-z0-9_-]/', '', $value ) : ''; |
| 379 | } |
| 380 | |
| 381 | /** |
| 382 | * Only the Payment Links & Buttons API may be called on a seller's behalf. |
| 383 | * |
| 384 | * @param mixed $value The path parameter. |
| 385 | * @return bool |
| 386 | */ |
| 387 | public function validate_path( $value ) { |
| 388 | return is_string( $value ) |
| 389 | && 1 === preg_match( '#^' . preg_quote( self::PAYPAL_PAYMENT_RESOURCES_ENDPOINT, '#' ) . '(/[A-Za-z0-9-]+)?(\?[^\s]*)?\z#', $value ); |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * Generate a PayPal Partner Referrals signup link. |
| 394 | * |
| 395 | * Authenticates with PayPal using Automattic's platform credentials, |
| 396 | * creates a partner referral, and returns the action_url. The referral is |
| 397 | * built here, so a site chooses only where PayPal sends the seller back. |
| 398 | * |
| 399 | * @param WP_REST_Request $request The REST request. |
| 400 | * @return WP_REST_Response|WP_Error |
| 401 | */ |
| 402 | public function generate_signup_link( WP_REST_Request $request ) { |
| 403 | $environment = $request->get_param( 'environment' ); |
| 404 | |
| 405 | $credentials = $this->get_platform_credentials( $environment ); |
| 406 | if ( is_wp_error( $credentials ) ) { |
| 407 | return $credentials; |
| 408 | } |
| 409 | |
| 410 | // The tracking ID is what later ties the seller back to this blog. |
| 411 | $tracking_id = self::TRACKING_ID_PREFIX . $this->site_id() . '-' . time(); |
| 412 | |
| 413 | // The site resolves the BN code, since only it knows whether a sandbox override applies. |
| 414 | $headers = array(); |
| 415 | $partner_attribution_id = (string) $request->get_param( 'partner_attribution_id' ); |
| 416 | if ( '' !== $partner_attribution_id ) { |
| 417 | $headers['PayPal-Partner-Attribution-Id'] = $partner_attribution_id; |
| 418 | } |
| 419 | |
| 420 | $response = $this->paypal_request( |
| 421 | $environment, |
| 422 | $credentials, |
| 423 | 'POST', |
| 424 | self::PAYPAL_REFERRALS_ENDPOINT, |
| 425 | self::build_referral( $tracking_id, (string) $request->get_param( 'return_url' ) ), |
| 426 | $headers |
| 427 | ); |
| 428 | |
| 429 | if ( is_wp_error( $response ) ) { |
| 430 | return $response; |
| 431 | } |
| 432 | |
| 433 | $status_code = wp_remote_retrieve_response_code( $response ); |
| 434 | $body = self::decode_body( $response ); |
| 435 | |
| 436 | if ( 201 !== $status_code && 200 !== $status_code ) { |
| 437 | /* |
| 438 | * PayPal's top-level message for a rejected referral is always the same |
| 439 | * generic sentence ("Request is not well-formed, syntactically |
| 440 | * incorrect, or violates schema."). Everything needed to act on it is |
| 441 | * in `details`, which names the offending field and issue, and in |
| 442 | * `debug_id`, which PayPal support needs to trace the call. Passing |
| 443 | * only the message through left callers with nothing to go on, so |
| 444 | * carry both. None of it is credential material. |
| 445 | */ |
| 446 | return new WP_Error( |
| 447 | 'paypal_referral_failed', |
| 448 | $body['message'] ?? 'PayPal Partner Referrals API returned an error.', |
| 449 | $this->paypal_error_data( $status_code, $body ) |
| 450 | ); |
| 451 | } |
| 452 | |
| 453 | $action_url = ''; |
| 454 | $referral_id = ''; |
| 455 | |
| 456 | if ( isset( $body['links'] ) && is_array( $body['links'] ) ) { |
| 457 | foreach ( $body['links'] as $link ) { |
| 458 | if ( 'action_url' === $link['rel'] ) { |
| 459 | $action_url = $link['href']; |
| 460 | } |
| 461 | if ( 'self' === $link['rel'] ) { |
| 462 | $parts = explode( '/', $link['href'] ); |
| 463 | $referral_id = end( $parts ); |
| 464 | } |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | if ( empty( $action_url ) ) { |
| 469 | return new WP_Error( |
| 470 | 'paypal_no_action_url', |
| 471 | 'PayPal returned a successful response but no onboarding URL was included.', |
| 472 | array( 'status' => 502 ) |
| 473 | ); |
| 474 | } |
| 475 | |
| 476 | return rest_ensure_response( |
| 477 | array( |
| 478 | 'action_url' => $action_url, |
| 479 | 'referral_id' => $referral_id, |
| 480 | 'tracking_id' => $tracking_id, |
| 481 | // Public: the site puts it in the JS SDK URL, next to the seller's merchant ID. |
| 482 | 'partner_client_id' => $credentials['client_id'], |
| 483 | ) |
| 484 | ); |
| 485 | } |
| 486 | |
| 487 | /** |
| 488 | * The Partner Referrals body for a THIRD_PARTY seller. |
| 489 | * |
| 490 | * @param string $tracking_id The tracking ID issued for the calling blog. |
| 491 | * @param string $return_url Where PayPal sends the seller back. |
| 492 | * @return array |
| 493 | */ |
| 494 | public static function build_referral( $tracking_id, $return_url ) { |
| 495 | return array( |
| 496 | 'tracking_id' => $tracking_id, |
| 497 | 'partner_config_override' => array( |
| 498 | 'return_url' => $return_url, |
| 499 | 'return_url_description' => __( 'Return to your WordPress site to complete setup.', 'jetpack-mu-wpcom' ), |
| 500 | 'show_add_credit_card' => true, |
| 501 | ), |
| 502 | 'operations' => array( |
| 503 | array( |
| 504 | 'operation' => 'API_INTEGRATION', |
| 505 | 'api_integration_preference' => array( |
| 506 | 'rest_api_integration' => array( |
| 507 | 'integration_method' => 'PAYPAL', |
| 508 | 'integration_type' => 'THIRD_PARTY', |
| 509 | 'third_party_details' => array( |
| 510 | 'features' => self::ONBOARDING_FEATURES, |
| 511 | ), |
| 512 | ), |
| 513 | ), |
| 514 | ), |
| 515 | ), |
| 516 | 'products' => self::ONBOARDING_PRODUCTS, |
| 517 | 'legal_consents' => array( |
| 518 | array( |
| 519 | 'type' => 'SHARE_DATA_CONSENT', |
| 520 | 'granted' => true, |
| 521 | ), |
| 522 | ), |
| 523 | ); |
| 524 | } |
| 525 | |
| 526 | /** |
| 527 | * Report a referred seller's integration status. |
| 528 | * |
| 529 | * By tracking ID for a seller who just finished onboarding, since PayPal's |
| 530 | * THIRD_PARTY flow hands the site nothing else to identify them by; by |
| 531 | * merchant ID afterwards. |
| 532 | * |
| 533 | * @param WP_REST_Request $request The REST request. |
| 534 | * @return WP_REST_Response|WP_Error PayPal's merchant integration, or WP_Error. |
| 535 | */ |
| 536 | public function get_merchant_integration_status( WP_REST_Request $request ) { |
| 537 | $environment = $request->get_param( 'environment' ); |
| 538 | $merchant_id = (string) $request->get_param( 'merchant_id' ); |
| 539 | $tracking_id = (string) $request->get_param( 'tracking_id' ); |
| 540 | $site_id = $this->site_id(); |
| 541 | |
| 542 | $credentials = $this->get_platform_credentials( $environment ); |
| 543 | if ( is_wp_error( $credentials ) ) { |
| 544 | return $credentials; |
| 545 | } |
| 546 | |
| 547 | if ( '' === $merchant_id && '' === $tracking_id ) { |
| 548 | return new WP_Error( |
| 549 | 'paypal_merchant_unspecified', |
| 550 | 'A merchant ID or a tracking ID is required.', |
| 551 | array( 'status' => 400 ) |
| 552 | ); |
| 553 | } |
| 554 | |
| 555 | if ( '' === $merchant_id ) { |
| 556 | // A tracking ID issued for another blog names a seller this site never referred. |
| 557 | if ( ! $this->tracking_id_belongs_to_site( $tracking_id, $site_id ) ) { |
| 558 | return $this->merchant_not_for_site_error(); |
| 559 | } |
| 560 | |
| 561 | $merchant_id = $this->find_merchant_id_by_tracking_id( $environment, $credentials, $tracking_id ); |
| 562 | if ( is_wp_error( $merchant_id ) ) { |
| 563 | return $merchant_id; |
| 564 | } |
| 565 | } elseif ( '' !== $tracking_id ) { |
| 566 | $bound = $this->assert_merchant_belongs_to_site( $environment, $credentials, $merchant_id, $site_id, $tracking_id ); |
| 567 | if ( is_wp_error( $bound ) ) { |
| 568 | return $bound; |
| 569 | } |
| 570 | } |
| 571 | |
| 572 | $integration = $this->get_merchant_integration( $environment, $credentials, $merchant_id ); |
| 573 | if ( is_wp_error( $integration ) ) { |
| 574 | return $integration; |
| 575 | } |
| 576 | |
| 577 | // With no tracking ID of its own, a blog proves itself by PayPal's latest record. |
| 578 | if ( '' === $tracking_id && ! $this->tracking_id_belongs_to_site( $integration['tracking_id'] ?? '', $site_id ) ) { |
| 579 | return $this->merchant_not_for_site_error(); |
| 580 | } |
| 581 | |
| 582 | $this->remember_merchant_binding( $environment, $site_id, $merchant_id ); |
| 583 | |
| 584 | return rest_ensure_response( $integration ); |
| 585 | } |
| 586 | |
| 587 | /** |
| 588 | * Make one Payment Links & Buttons call on a referred seller's behalf. |
| 589 | * |
| 590 | * The call is signed with Automattic's platform token and a PayPal-Auth-Assertion |
| 591 | * naming the seller. PayPal's status and body come back as they are: the site |
| 592 | * already knows how to read them, and its own error messages depend on them. |
| 593 | * |
| 594 | * @param WP_REST_Request $request The REST request. |
| 595 | * @return WP_REST_Response|WP_Error {status, body} on any PayPal answer, WP_Error when PayPal could not be reached. |
| 596 | */ |
| 597 | public function forward_request( WP_REST_Request $request ) { |
| 598 | $environment = $request->get_param( 'environment' ); |
| 599 | $merchant_id = (string) $request->get_param( 'merchant_id' ); |
| 600 | $site_id = $this->site_id(); |
| 601 | |
| 602 | $credentials = $this->get_platform_credentials( $environment ); |
| 603 | if ( is_wp_error( $credentials ) ) { |
| 604 | return $credentials; |
| 605 | } |
| 606 | |
| 607 | $bound = $this->assert_merchant_belongs_to_site( |
| 608 | $environment, |
| 609 | $credentials, |
| 610 | $merchant_id, |
| 611 | $site_id, |
| 612 | (string) $request->get_param( 'tracking_id' ) |
| 613 | ); |
| 614 | if ( is_wp_error( $bound ) ) { |
| 615 | return $bound; |
| 616 | } |
| 617 | |
| 618 | $headers = array( |
| 619 | 'PayPal-Auth-Assertion' => self::build_auth_assertion( $credentials['client_id'], $merchant_id ), |
| 620 | ); |
| 621 | |
| 622 | $request_id = (string) $request->get_param( 'request_id' ); |
| 623 | if ( '' !== $request_id ) { |
| 624 | $headers['PayPal-Request-Id'] = $request_id; |
| 625 | } |
| 626 | |
| 627 | $response = $this->paypal_request( |
| 628 | $environment, |
| 629 | $credentials, |
| 630 | $request->get_param( 'method' ), |
| 631 | $request->get_param( 'path' ), |
| 632 | $request->get_param( 'body' ), |
| 633 | $headers |
| 634 | ); |
| 635 | |
| 636 | if ( is_wp_error( $response ) ) { |
| 637 | return $response; |
| 638 | } |
| 639 | |
| 640 | return rest_ensure_response( |
| 641 | array( |
| 642 | 'status' => (int) wp_remote_retrieve_response_code( $response ), |
| 643 | 'body' => (string) wp_remote_retrieve_body( $response ), |
| 644 | ) |
| 645 | ); |
| 646 | } |
| 647 | |
| 648 | /** |
| 649 | * The PayPal-Auth-Assertion header value for acting on a seller's behalf. |
| 650 | * |
| 651 | * An unsigned JWT ("alg": "none") naming the partner's client ID as issuer and |
| 652 | * the seller as payer, per PayPal's third-party integration contract. |
| 653 | * |
| 654 | * @param string $client_id The platform client ID. |
| 655 | * @param string $merchant_id The seller's PayPal merchant ID. |
| 656 | * @return string |
| 657 | */ |
| 658 | public static function build_auth_assertion( $client_id, $merchant_id ) { |
| 659 | // phpcs:disable WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode -- JWT segments, as PayPal specifies. |
| 660 | $header = base64_encode( wp_json_encode( array( 'alg' => 'none' ), JSON_UNESCAPED_SLASHES ) ); |
| 661 | $payload = base64_encode( |
| 662 | wp_json_encode( |
| 663 | array( |
| 664 | 'iss' => $client_id, |
| 665 | 'payer_id' => $merchant_id, |
| 666 | ), |
| 667 | JSON_UNESCAPED_SLASHES |
| 668 | ) |
| 669 | ); |
| 670 | // phpcs:enable |
| 671 | |
| 672 | return $header . '.' . $payload . '.'; |
| 673 | } |
| 674 | |
| 675 | /** |
| 676 | * Whether a tracking ID was issued for this blog. |
| 677 | * |
| 678 | * @param string $tracking_id A referral tracking ID. |
| 679 | * @param int $site_id The calling blog's ID. |
| 680 | * @return bool |
| 681 | */ |
| 682 | private function tracking_id_belongs_to_site( $tracking_id, $site_id ) { |
| 683 | return 0 === strpos( (string) $tracking_id, self::TRACKING_ID_PREFIX . $site_id . '-' ); |
| 684 | } |
| 685 | |
| 686 | /** |
| 687 | * The error for a merchant this blog did not refer. |
| 688 | * |
| 689 | * @return WP_Error |
| 690 | */ |
| 691 | private function merchant_not_for_site_error() { |
| 692 | return new WP_Error( |
| 693 | 'paypal_merchant_not_for_site', |
| 694 | 'This PayPal account was not connected through this site.', |
| 695 | array( 'status' => 403 ) |
| 696 | ); |
| 697 | } |
| 698 | |
| 699 | /** |
| 700 | * Refuse to act for a seller this blog did not refer. |
| 701 | * |
| 702 | * The blog token proves which site is calling, not which seller it may act |
| 703 | * for. A blog that sends the tracking ID it onboarded the seller with is |
| 704 | * checked by resolving that ID at PayPal; one that sends none is checked |
| 705 | * against the seller's integration record, which names only the latest |
| 706 | * referral. A verified pair is remembered so the check is not a PayPal call |
| 707 | * on every button operation. |
| 708 | * |
| 709 | * @param string $environment 'sandbox' or 'production'. |
| 710 | * @param array $credentials Platform credentials. |
| 711 | * @param string $merchant_id The seller's PayPal merchant ID. |
| 712 | * @param int $site_id The calling blog's ID. |
| 713 | * @param string $tracking_id The tracking ID the blog onboarded the seller with, when it has one. |
| 714 | * @return true|WP_Error |
| 715 | */ |
| 716 | private function assert_merchant_belongs_to_site( $environment, $credentials, $merchant_id, $site_id, $tracking_id = '' ) { |
| 717 | if ( '' === $merchant_id ) { |
| 718 | return $this->merchant_not_for_site_error(); |
| 719 | } |
| 720 | |
| 721 | if ( get_transient( $this->merchant_binding_key( $environment, $site_id, $merchant_id ) ) ) { |
| 722 | return true; |
| 723 | } |
| 724 | |
| 725 | if ( '' !== $tracking_id ) { |
| 726 | $named = $this->tracking_id_names_merchant( $environment, $credentials, $tracking_id, $merchant_id, $site_id ); |
| 727 | if ( is_wp_error( $named ) ) { |
| 728 | return $named; |
| 729 | } |
| 730 | } else { |
| 731 | $integration = $this->get_merchant_integration( $environment, $credentials, $merchant_id ); |
| 732 | if ( is_wp_error( $integration ) ) { |
| 733 | return $integration; |
| 734 | } |
| 735 | |
| 736 | if ( ! $this->tracking_id_belongs_to_site( $integration['tracking_id'] ?? '', $site_id ) ) { |
| 737 | return $this->merchant_not_for_site_error(); |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | $this->remember_merchant_binding( $environment, $site_id, $merchant_id ); |
| 742 | |
| 743 | return true; |
| 744 | } |
| 745 | |
| 746 | /** |
| 747 | * Whether a blog's own tracking ID resolves to the seller at PayPal. |
| 748 | * |
| 749 | * PayPal keeps every tracking ID a seller ever onboarded with, so a blog's ID |
| 750 | * stays valid after the seller connects another site, which only moves the |
| 751 | * record's latest ID. Only WordPress.com mints these, for the blog named in |
| 752 | * them, so one that resolves proves the referral. |
| 753 | * |
| 754 | * @param string $environment 'sandbox' or 'production'. |
| 755 | * @param array $credentials Platform credentials. |
| 756 | * @param string $tracking_id The tracking ID the blog presents. |
| 757 | * @param string $merchant_id The seller the blog wants to act for. |
| 758 | * @param int $site_id The calling blog's ID. |
| 759 | * @return true|WP_Error |
| 760 | */ |
| 761 | private function tracking_id_names_merchant( $environment, $credentials, $tracking_id, $merchant_id, $site_id ) { |
| 762 | if ( ! $this->tracking_id_belongs_to_site( $tracking_id, $site_id ) ) { |
| 763 | return $this->merchant_not_for_site_error(); |
| 764 | } |
| 765 | |
| 766 | $found = $this->find_merchant_id_by_tracking_id( $environment, $credentials, $tracking_id ); |
| 767 | if ( is_wp_error( $found ) ) { |
| 768 | // No such referral at PayPal: the blog never onboarded a seller with it. |
| 769 | return 'paypal_merchant_not_found' === $found->get_error_code() |
| 770 | ? $this->merchant_not_for_site_error() |
| 771 | : $found; |
| 772 | } |
| 773 | |
| 774 | if ( $found !== $merchant_id ) { |
| 775 | return $this->merchant_not_for_site_error(); |
| 776 | } |
| 777 | |
| 778 | return true; |
| 779 | } |
| 780 | |
| 781 | /** |
| 782 | * Remember that a seller was referred by a blog. |
| 783 | * |
| 784 | * @param string $environment 'sandbox' or 'production'. |
| 785 | * @param int $site_id The blog's ID. |
| 786 | * @param string $merchant_id The seller's PayPal merchant ID. |
| 787 | */ |
| 788 | private function remember_merchant_binding( $environment, $site_id, $merchant_id ) { |
| 789 | set_transient( $this->merchant_binding_key( $environment, $site_id, $merchant_id ), 1, self::MERCHANT_BINDING_TTL ); |
| 790 | } |
| 791 | |
| 792 | /** |
| 793 | * Transient key for one blog-to-merchant binding. |
| 794 | * |
| 795 | * @param string $environment 'sandbox' or 'production'. |
| 796 | * @param int $site_id The blog's ID. |
| 797 | * @param string $merchant_id The seller's PayPal merchant ID. |
| 798 | * @return string |
| 799 | */ |
| 800 | private function merchant_binding_key( $environment, $site_id, $merchant_id ) { |
| 801 | return 'paypal_platform_merchant_' . md5( $environment . '|' . $site_id . '|' . $merchant_id ); |
| 802 | } |
| 803 | |
| 804 | /** |
| 805 | * Find the merchant ID behind a tracking ID. |
| 806 | * |
| 807 | * @param string $environment 'sandbox' or 'production'. |
| 808 | * @param array $credentials Platform credentials. |
| 809 | * @param string $tracking_id The referral's tracking ID. |
| 810 | * @return string|WP_Error |
| 811 | */ |
| 812 | private function find_merchant_id_by_tracking_id( $environment, $credentials, $tracking_id ) { |
| 813 | $response = $this->paypal_request( |
| 814 | $environment, |
| 815 | $credentials, |
| 816 | 'GET', |
| 817 | sprintf( self::PAYPAL_MERCHANT_INTEGRATIONS_ENDPOINT, $credentials['partner_merchant_id'] ) . '?tracking_id=' . rawurlencode( $tracking_id ), |
| 818 | null, |
| 819 | array(), |
| 820 | // Skip logging the 404 PayPal answers until the seller finishes onboarding. |
| 821 | array( 404 ) |
| 822 | ); |
| 823 | |
| 824 | if ( is_wp_error( $response ) ) { |
| 825 | return $response; |
| 826 | } |
| 827 | |
| 828 | $status_code = wp_remote_retrieve_response_code( $response ); |
| 829 | $body = self::decode_body( $response ); |
| 830 | |
| 831 | if ( 200 !== $status_code || empty( $body['merchant_id'] ) ) { |
| 832 | // PayPal answers 404 until the seller has finished, so the caller can retry. |
| 833 | return new WP_Error( |
| 834 | 'paypal_merchant_not_found', |
| 835 | 'PayPal has no seller for this onboarding session yet.', |
| 836 | $this->paypal_error_data( 200 === $status_code ? 404 : $status_code, $body ) |
| 837 | ); |
| 838 | } |
| 839 | |
| 840 | return (string) $body['merchant_id']; |
| 841 | } |
| 842 | |
| 843 | /** |
| 844 | * Read a seller's integration record. |
| 845 | * |
| 846 | * @param string $environment 'sandbox' or 'production'. |
| 847 | * @param array $credentials Platform credentials. |
| 848 | * @param string $merchant_id The seller's PayPal merchant ID. |
| 849 | * @return array|WP_Error PayPal's merchant integration body. |
| 850 | */ |
| 851 | private function get_merchant_integration( $environment, $credentials, $merchant_id ) { |
| 852 | $response = $this->paypal_request( |
| 853 | $environment, |
| 854 | $credentials, |
| 855 | 'GET', |
| 856 | sprintf( self::PAYPAL_MERCHANT_INTEGRATIONS_ENDPOINT, $credentials['partner_merchant_id'] ) . '/' . rawurlencode( $merchant_id ) |
| 857 | ); |
| 858 | |
| 859 | if ( is_wp_error( $response ) ) { |
| 860 | return $response; |
| 861 | } |
| 862 | |
| 863 | $status_code = wp_remote_retrieve_response_code( $response ); |
| 864 | $body = self::decode_body( $response ); |
| 865 | |
| 866 | if ( 200 !== $status_code || array() === $body ) { |
| 867 | return new WP_Error( |
| 868 | 'paypal_merchant_status_error', |
| 869 | 'Could not retrieve merchant integration status from PayPal.', |
| 870 | $this->paypal_error_data( $status_code, $body ) |
| 871 | ); |
| 872 | } |
| 873 | |
| 874 | return $body; |
| 875 | } |
| 876 | |
| 877 | /** |
| 878 | * PayPal's JSON body as an array; anything that is not a JSON object reads as empty. |
| 879 | * |
| 880 | * @param array $response The wp_remote_request() response. |
| 881 | * @return array |
| 882 | */ |
| 883 | private static function decode_body( $response ) { |
| 884 | $body = json_decode( wp_remote_retrieve_body( $response ), true ); |
| 885 | |
| 886 | return is_array( $body ) ? $body : array(); |
| 887 | } |
| 888 | |
| 889 | /** |
| 890 | * Error data carrying PayPal's diagnostics through to the site. |
| 891 | * |
| 892 | * @param int $status_code PayPal's HTTP status. |
| 893 | * @param array $body PayPal's decoded error body. |
| 894 | * @return array |
| 895 | */ |
| 896 | private function paypal_error_data( $status_code, array $body ) { |
| 897 | $error_data = array( 'status' => $status_code ); |
| 898 | |
| 899 | if ( ! empty( $body['name'] ) ) { |
| 900 | $error_data['paypal_error'] = $body['name']; |
| 901 | } |
| 902 | if ( ! empty( $body['details'] ) && is_array( $body['details'] ) ) { |
| 903 | $error_data['paypal_details'] = $body['details']; |
| 904 | } |
| 905 | if ( ! empty( $body['debug_id'] ) ) { |
| 906 | $error_data['paypal_debug_id'] = $body['debug_id']; |
| 907 | } |
| 908 | |
| 909 | return $error_data; |
| 910 | } |
| 911 | |
| 912 | /** |
| 913 | * Make one authenticated call to PayPal with the platform token. |
| 914 | * |
| 915 | * @param string $environment 'sandbox' or 'production'. |
| 916 | * @param array $credentials Platform credentials. |
| 917 | * @param string $method HTTP method. |
| 918 | * @param string $path API path, with any query string. |
| 919 | * @param array|null $body JSON body for POST and PUT. |
| 920 | * @param array $extra_headers Headers added to the standard set. |
| 921 | * @param int[] $unlogged_statuses Expected error statuses to skip logging. |
| 922 | * @return array|WP_Error The wp_remote_request() response, or WP_Error (502) when PayPal was unreachable. |
| 923 | */ |
| 924 | private function paypal_request( $environment, $credentials, $method, $path, $body = null, $extra_headers = array(), $unlogged_statuses = array() ) { |
| 925 | $base_url = $this->base_url( $environment ); |
| 926 | |
| 927 | $token = $this->get_paypal_access_token( $environment, $base_url, $credentials['client_id'], $credentials['client_secret'] ); |
| 928 | if ( is_wp_error( $token ) ) { |
| 929 | return $token; |
| 930 | } |
| 931 | |
| 932 | $args = array( |
| 933 | 'method' => $method, |
| 934 | 'timeout' => 30, |
| 935 | 'headers' => array_merge( |
| 936 | array( |
| 937 | 'Authorization' => 'Bearer ' . $token, |
| 938 | 'Content-Type' => 'application/json', |
| 939 | 'Accept' => 'application/json', |
| 940 | ), |
| 941 | $extra_headers |
| 942 | ), |
| 943 | ); |
| 944 | |
| 945 | if ( null !== $body && in_array( $method, array( 'POST', 'PUT' ), true ) ) { |
| 946 | $args['body'] = wp_json_encode( $body, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE ); |
| 947 | } |
| 948 | |
| 949 | $response = wp_remote_request( $base_url . $path, $args ); |
| 950 | |
| 951 | if ( is_wp_error( $response ) ) { |
| 952 | return new WP_Error( |
| 953 | 'paypal_request_failed', |
| 954 | $response->get_error_message(), |
| 955 | array( 'status' => 502 ) |
| 956 | ); |
| 957 | } |
| 958 | |
| 959 | $status_code = (int) wp_remote_retrieve_response_code( $response ); |
| 960 | if ( ( $status_code < 200 || $status_code >= 300 ) && ! in_array( $status_code, $unlogged_statuses, true ) ) { |
| 961 | $this->log_paypal_error( $response, $status_code, $method, $path ); |
| 962 | } |
| 963 | |
| 964 | return $response; |
| 965 | } |
| 966 | |
| 967 | /** |
| 968 | * Log a PayPal error with its debug ID, which PayPal support uses to trace the call. |
| 969 | * Logging errors are caught so the PayPal call still returns. |
| 970 | * |
| 971 | * @param array $response The wp_remote_request() response. |
| 972 | * @param int $status_code PayPal's HTTP status. |
| 973 | * @param string $method HTTP method. |
| 974 | * @param string $path API path, with any query string. |
| 975 | */ |
| 976 | private function log_paypal_error( $response, $status_code, $method, $path ) { |
| 977 | try { |
| 978 | // A 401 has the debug ID only in the header. Fall back to the body. |
| 979 | $debug_id = wp_remote_retrieve_header( $response, 'paypal-debug-id' ); |
| 980 | if ( ! is_string( $debug_id ) || '' === $debug_id ) { |
| 981 | $debug_id = self::decode_body( $response )['debug_id'] ?? ''; |
| 982 | } |
| 983 | |
| 984 | // Use site_id(). For a self-hosted caller the current blog is public-api's. |
| 985 | $extra = array( |
| 986 | 'debug_id' => $debug_id, |
| 987 | 'status' => $status_code, |
| 988 | 'method' => $method, |
| 989 | 'path' => $path, |
| 990 | 'site_id' => $this->site_id(), |
| 991 | ); |
| 992 | |
| 993 | /** |
| 994 | * Filters whether to send PayPal API errors to logstash. |
| 995 | * |
| 996 | * @param bool $enabled Whether to send the entry. Default true. |
| 997 | * @param array $extra The entry's data. |
| 998 | */ |
| 999 | if ( ! (bool) apply_filters( 'wpcom_paypal_payment_buttons_log_enabled', true, $extra ) ) { |
| 1000 | return; |
| 1001 | } |
| 1002 | |
| 1003 | \Automattic\Jetpack\Jetpack_Mu_Wpcom::log2logstash( 'paypal_payment_buttons', 'api_error', $extra ); |
| 1004 | } catch ( \Throwable $e ) { |
| 1005 | unset( $e ); |
| 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | /** |
| 1010 | * PayPal's API host for an environment. |
| 1011 | * |
| 1012 | * @param string $environment 'sandbox' or 'production'. |
| 1013 | * @return string |
| 1014 | */ |
| 1015 | private function base_url( $environment ) { |
| 1016 | return 'production' === $environment |
| 1017 | ? self::PAYPAL_PRODUCTION_BASE_URL |
| 1018 | : self::PAYPAL_SANDBOX_BASE_URL; |
| 1019 | } |
| 1020 | |
| 1021 | /** |
| 1022 | * Get Automattic's PayPal platform credentials for the given environment. |
| 1023 | * |
| 1024 | * @param string $environment 'sandbox' or 'production'. |
| 1025 | * @return array|WP_Error Array with 'client_id', 'client_secret' and 'partner_merchant_id', or WP_Error. |
| 1026 | */ |
| 1027 | private function get_platform_credentials( $environment ) { |
| 1028 | $constants = self::PLATFORM_CREDENTIAL_CONSTANTS[ $environment ] ?? array(); |
| 1029 | |
| 1030 | $credentials = array(); |
| 1031 | $missing = array(); |
| 1032 | |
| 1033 | foreach ( $constants as $key => $constant_name ) { |
| 1034 | $value = Constants::get_constant( $constant_name ); |
| 1035 | if ( is_string( $value ) && '' !== $value ) { |
| 1036 | $credentials[ $key ] = $value; |
| 1037 | } else { |
| 1038 | $missing[] = $constant_name; |
| 1039 | } |
| 1040 | } |
| 1041 | |
| 1042 | if ( empty( $missing ) ) { |
| 1043 | return $credentials; |
| 1044 | } |
| 1045 | |
| 1046 | /* |
| 1047 | * Separate "nothing is provisioned here at all" from "this environment is |
| 1048 | * not provisioned". The option this replaced could tell them apart because |
| 1049 | * one value held every environment; per-environment constants cannot, so |
| 1050 | * look at the whole set. The second message is the actionable one, and it |
| 1051 | * is what a sandbox-only configuration hits when asked for production. |
| 1052 | */ |
| 1053 | $anything_provisioned = false; |
| 1054 | foreach ( self::PLATFORM_CREDENTIAL_CONSTANTS as $environment_constants ) { |
| 1055 | foreach ( $environment_constants as $constant_name ) { |
| 1056 | $value = Constants::get_constant( $constant_name ); |
| 1057 | if ( is_string( $value ) && '' !== $value ) { |
| 1058 | $anything_provisioned = true; |
| 1059 | break 2; |
| 1060 | } |
| 1061 | } |
| 1062 | } |
| 1063 | |
| 1064 | if ( ! $anything_provisioned ) { |
| 1065 | return new WP_Error( |
| 1066 | 'platform_credentials_missing', |
| 1067 | 'PayPal platform credentials are not configured on WordPress.com. Please contact the Jetpack team.', |
| 1068 | array( 'status' => 500 ) |
| 1069 | ); |
| 1070 | } |
| 1071 | |
| 1072 | /* |
| 1073 | * Name the constants that are absent. "not configured" on its own sends |
| 1074 | * whoever is provisioning the environment hunting through three names to |
| 1075 | * find which one they missed. |
| 1076 | * |
| 1077 | * The partner merchant ID keeps its own code: it is Automattic's own |
| 1078 | * PayPal account ID rather than an API credential, it is easy to overlook |
| 1079 | * because the referral link is generated without it, and the flow only |
| 1080 | * breaks later -- when the seller has already finished onboarding. |
| 1081 | */ |
| 1082 | $partner_constant = $constants['partner_merchant_id'] ?? ''; |
| 1083 | $only_partner_id = array( $partner_constant ) === $missing; |
| 1084 | $error_code = $only_partner_id |
| 1085 | ? 'platform_partner_merchant_id_missing' |
| 1086 | : 'platform_credentials_invalid'; |
| 1087 | $missing_explained = $only_partner_id |
| 1088 | ? 'Onboarding cannot be completed without it.' |
| 1089 | : 'Onboarding cannot be started without them.'; |
| 1090 | |
| 1091 | return new WP_Error( |
| 1092 | $error_code, |
| 1093 | sprintf( |
| 1094 | 'PayPal platform credentials for the %1$s environment are incomplete. Missing: %2$s. %3$s', |
| 1095 | $environment, |
| 1096 | implode( ', ', $missing ), |
| 1097 | $missing_explained |
| 1098 | ), |
| 1099 | array( 'status' => 500 ) |
| 1100 | ); |
| 1101 | } |
| 1102 | |
| 1103 | /** |
| 1104 | * Transient key for the cached platform token of one environment. |
| 1105 | * |
| 1106 | * @param string $environment 'sandbox' or 'production'. |
| 1107 | * @return string |
| 1108 | */ |
| 1109 | public static function token_cache_key( $environment ) { |
| 1110 | return 'paypal_platform_token_' . $environment; |
| 1111 | } |
| 1112 | |
| 1113 | /** |
| 1114 | * Get a PayPal OAuth access token using client credentials grant. |
| 1115 | * |
| 1116 | * Cached until shortly before it expires: with every button operation now |
| 1117 | * passing through here, a token exchange per call would double the traffic. |
| 1118 | * |
| 1119 | * @param string $environment 'sandbox' or 'production'. |
| 1120 | * @param string $base_url PayPal API base URL. |
| 1121 | * @param string $client_id Platform client ID. |
| 1122 | * @param string $client_secret Platform client secret. |
| 1123 | * @return string|WP_Error Access token string, or WP_Error. |
| 1124 | */ |
| 1125 | private function get_paypal_access_token( $environment, $base_url, $client_id, $client_secret ) { |
| 1126 | $cached = get_transient( self::token_cache_key( $environment ) ); |
| 1127 | if ( is_string( $cached ) && '' !== $cached ) { |
| 1128 | return $cached; |
| 1129 | } |
| 1130 | |
| 1131 | $response = wp_remote_post( |
| 1132 | $base_url . self::PAYPAL_TOKEN_ENDPOINT, |
| 1133 | array( |
| 1134 | 'timeout' => 15, |
| 1135 | 'headers' => array( |
| 1136 | 'Authorization' => 'Basic ' . base64_encode( $client_id . ':' . $client_secret ), // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode -- Required by PayPal OAuth spec. |
| 1137 | 'Content-Type' => 'application/x-www-form-urlencoded', |
| 1138 | 'Accept' => 'application/json', |
| 1139 | ), |
| 1140 | 'body' => 'grant_type=client_credentials', |
| 1141 | ) |
| 1142 | ); |
| 1143 | |
| 1144 | if ( is_wp_error( $response ) ) { |
| 1145 | return new WP_Error( |
| 1146 | 'paypal_token_failed', |
| 1147 | $response->get_error_message(), |
| 1148 | array( 'status' => 502 ) |
| 1149 | ); |
| 1150 | } |
| 1151 | |
| 1152 | $status_code = (int) wp_remote_retrieve_response_code( $response ); |
| 1153 | $data = self::decode_body( $response ); |
| 1154 | |
| 1155 | if ( 200 !== $status_code ) { |
| 1156 | $this->log_paypal_error( $response, $status_code, 'POST', self::PAYPAL_TOKEN_ENDPOINT ); |
| 1157 | } |
| 1158 | |
| 1159 | if ( 200 !== $status_code || empty( $data['access_token'] ) ) { |
| 1160 | return new WP_Error( |
| 1161 | 'paypal_token_error', |
| 1162 | 'Failed to obtain PayPal access token with platform credentials.', |
| 1163 | array( 'status' => 502 ) |
| 1164 | ); |
| 1165 | } |
| 1166 | |
| 1167 | $expires_in = isset( $data['expires_in'] ) ? (int) $data['expires_in'] : 0; |
| 1168 | if ( $expires_in > self::TOKEN_EXPIRY_BUFFER ) { |
| 1169 | set_transient( self::token_cache_key( $environment ), $data['access_token'], $expires_in - self::TOKEN_EXPIRY_BUFFER ); |
| 1170 | } |
| 1171 | |
| 1172 | return $data['access_token']; |
| 1173 | } |
| 1174 | } |
| 1175 | |
| 1176 | wpcom_rest_api_v2_load_plugin( 'WPCOM_REST_API_V2_Endpoint_PayPal_Onboarding' ); |