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| 1 | <?php |
| 2 | /** |
| 3 | * Handles the sending of email previews via the WordPress.com REST API. |
| 4 | * |
| 5 | * @package automattic/jetpack |
| 6 | */ |
| 7 | |
| 8 | use Automattic\Jetpack\Connection\Manager; |
| 9 | use Automattic\Jetpack\Connection\Traits\WPCOM_REST_API_Proxy_Request; |
| 10 | use Automattic\Jetpack\Status\Host; |
| 11 | |
| 12 | if ( ! defined( 'ABSPATH' ) ) { |
| 13 | exit( 0 ); |
| 14 | } |
| 15 | |
| 16 | /** |
| 17 | * Class WPCOM_REST_API_V2_Endpoint_Send_Email_Preview |
| 18 | * Handles the sending of email previews via the WordPress.com REST API |
| 19 | */ |
| 20 | class WPCOM_REST_API_V2_Endpoint_Send_Email_Preview extends WP_REST_Controller { |
| 21 | |
| 22 | use WPCOM_REST_API_Proxy_Request; |
| 23 | |
| 24 | /** |
| 25 | * Constructor. |
| 26 | */ |
| 27 | public function __construct() { |
| 28 | $this->base_api_path = 'wpcom'; |
| 29 | $this->version = 'v2'; |
| 30 | $this->namespace = $this->base_api_path . '/' . $this->version; |
| 31 | $this->rest_base = '/send-email-preview'; |
| 32 | $this->wpcom_is_wpcom_only_endpoint = true; |
| 33 | $this->wpcom_is_site_specific_endpoint = true; |
| 34 | |
| 35 | add_action( 'rest_api_init', array( $this, 'register_routes' ) ); |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * Registers the routes for blogging prompts. |
| 40 | * |
| 41 | * @see register_rest_route() |
| 42 | */ |
| 43 | public function register_routes() { |
| 44 | $options = array( |
| 45 | 'show_in_index' => true, |
| 46 | 'methods' => 'POST', |
| 47 | // if this is not a wpcom site, we need to proxy the request to wpcom |
| 48 | 'callback' => ( ( new Host() )->is_wpcom_simple() ) ? array( |
| 49 | $this, |
| 50 | 'send_email_preview', |
| 51 | ) : array( $this, 'proxy_request_to_wpcom_as_user' ), |
| 52 | 'permission_callback' => array( $this, 'permissions_check' ), |
| 53 | 'args' => array( |
| 54 | 'id' => array( |
| 55 | 'description' => __( 'Unique identifier for the post.', 'jetpack' ), |
| 56 | 'type' => 'integer', |
| 57 | ), |
| 58 | ), |
| 59 | ); |
| 60 | |
| 61 | register_rest_route( |
| 62 | $this->namespace, |
| 63 | $this->rest_base, |
| 64 | $options |
| 65 | ); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Checks if the user is connected and has access to edit the post |
| 70 | * |
| 71 | * @param WP_REST_Request $request Full data about the request. |
| 72 | * |
| 73 | * @return true|WP_Error True if the request has edit access, WP_Error object otherwise. |
| 74 | */ |
| 75 | public function permissions_check( $request ) { |
| 76 | if ( ! ( new Host() )->is_wpcom_simple() ) { |
| 77 | if ( ! ( new Manager() )->is_user_connected() ) { |
| 78 | return new WP_Error( |
| 79 | 'rest_cannot_send_email_preview', |
| 80 | __( 'Please connect your user account to WordPress.com', 'jetpack' ), |
| 81 | array( 'status' => rest_authorization_required_code() ) |
| 82 | ); |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | $post = get_post( $request->get_param( 'id' ) ); |
| 87 | |
| 88 | if ( is_wp_error( $post ) ) { |
| 89 | return $post; |
| 90 | } |
| 91 | |
| 92 | if ( $post && ! current_user_can( 'edit_post', $post->ID ) ) { |
| 93 | return new WP_Error( |
| 94 | 'rest_forbidden_context', |
| 95 | __( 'Please connect your user account to WordPress.com', 'jetpack' ), |
| 96 | array( 'status' => rest_authorization_required_code() ) |
| 97 | ); |
| 98 | } |
| 99 | |
| 100 | return true; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Build an Akismet payload describing the post content being previewed. |
| 105 | * |
| 106 | * Uses the post author as the identity signal (not the caller), because |
| 107 | * the author is what Akismet should evaluate the content against. |
| 108 | * |
| 109 | * @since 15.8 |
| 110 | * |
| 111 | * @param WP_Post $post Post being previewed. |
| 112 | * @return array Associative payload suitable for http_build_query(). |
| 113 | */ |
| 114 | protected function prepare_post_for_akismet( WP_Post $post ): array { |
| 115 | $author = get_userdata( (int) $post->post_author ); |
| 116 | |
| 117 | $payload = array( |
| 118 | 'comment_type' => 'blog-post-preview', |
| 119 | 'comment_content' => $post->post_title . "\n\n" . $post->post_content, |
| 120 | 'comment_author' => $author ? $author->display_name : '', |
| 121 | 'comment_author_email' => $author ? $author->user_email : '', |
| 122 | 'comment_author_url' => $author ? $author->user_url : '', |
| 123 | 'permalink' => (string) get_permalink( $post ), |
| 124 | 'blog' => (string) get_option( 'home' ), |
| 125 | 'blog_lang' => (string) get_bloginfo( 'language' ), |
| 126 | 'comment_date_gmt' => gmdate( DATE_ATOM, time() ), |
| 127 | ); |
| 128 | |
| 129 | /** |
| 130 | * Filter the values sent to Akismet when checking an email preview. |
| 131 | * |
| 132 | * @module subscriptions |
| 133 | * |
| 134 | * @since 15.8 |
| 135 | * |
| 136 | * @param array $payload The values being sent to Akismet. |
| 137 | * @param WP_Post $post The post being previewed. |
| 138 | */ |
| 139 | $filtered_payload = apply_filters( 'jetpack_send_email_preview_akismet_values', $payload, $post ); |
| 140 | |
| 141 | return is_array( $filtered_payload ) ? $filtered_payload : $payload; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Whether the Akismet plugin is loaded and usable in this request. |
| 146 | * |
| 147 | * Extracted into a method so tests can override it via a subclass. |
| 148 | * |
| 149 | * @since 15.8 |
| 150 | * |
| 151 | * @return bool |
| 152 | */ |
| 153 | protected function is_akismet_available(): bool { |
| 154 | return function_exists( 'akismet_http_post' ) || ( class_exists( 'Akismet' ) && method_exists( 'Akismet', 'http_post' ) ); |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * POST a comment-check payload to the Akismet service. |
| 159 | * |
| 160 | * Extracted into a method so tests can override it via a subclass. |
| 161 | * |
| 162 | * @since 15.8 |
| 163 | * |
| 164 | * @param string $query_string URL-encoded payload. |
| 165 | * @return array Two-element array as returned by Akismet: [ headers_array, body_string ]. |
| 166 | */ |
| 167 | protected function akismet_http_post( string $query_string ): array { |
| 168 | if ( method_exists( 'Akismet', 'http_post' ) ) { |
| 169 | return \Akismet::http_post( $query_string, 'comment-check' ); |
| 170 | } |
| 171 | |
| 172 | global $akismet_api_host, $akismet_api_port; |
| 173 | return akismet_http_post( $query_string, $akismet_api_host, '/1.1/comment-check', $akismet_api_port ); |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Ask Akismet whether a post being previewed looks like spam. |
| 178 | * |
| 179 | * Fail-open: any ambiguity (Akismet absent, malformed response) returns false |
| 180 | * so the author's workflow isn't blocked on service hiccups. |
| 181 | * |
| 182 | * @since 15.8 |
| 183 | * |
| 184 | * @param WP_Post $post Post being previewed. |
| 185 | * @return bool True when Akismet classifies the content as spam; false otherwise. |
| 186 | */ |
| 187 | protected function check_post_for_spam( WP_Post $post ): bool { |
| 188 | if ( ! $this->is_akismet_available() ) { |
| 189 | return false; |
| 190 | } |
| 191 | |
| 192 | $form = $this->prepare_post_for_akismet( $post ); |
| 193 | $response = $this->akismet_http_post( http_build_query( $form ) ); |
| 194 | |
| 195 | if ( |
| 196 | isset( $response[0]['x-akismet-pro-tip'] ) && |
| 197 | 'discard' === trim( $response[0]['x-akismet-pro-tip'] ) && |
| 198 | '1' === get_option( 'akismet_strictness' ) |
| 199 | ) { |
| 200 | return true; |
| 201 | } |
| 202 | |
| 203 | return isset( $response[1] ) && 'true' === trim( $response[1] ); |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * Sends an email preview of a post to the current user. |
| 208 | * |
| 209 | * @param WP_REST_Request $request Full data about the request. |
| 210 | * |
| 211 | * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure. |
| 212 | */ |
| 213 | public function send_email_preview( $request ) { |
| 214 | $post_id = $request['id']; |
| 215 | $post = get_post( $post_id ); |
| 216 | |
| 217 | // Return error if the post cannot be retrieved |
| 218 | if ( is_wp_error( $post ) ) { |
| 219 | return $post; |
| 220 | } |
| 221 | |
| 222 | if ( ! $post instanceof WP_Post ) { |
| 223 | return new WP_Error( |
| 224 | 'rest_post_invalid_id', |
| 225 | __( 'Invalid post ID.', 'jetpack' ), |
| 226 | array( 'status' => 404 ) |
| 227 | ); |
| 228 | } |
| 229 | |
| 230 | // Check if the user's email is verified |
| 231 | if ( Email_Verification::is_email_unverified() ) { |
| 232 | return new WP_Error( 'unverified', __( 'Your email address must be verified.', 'jetpack' ), array( 'status' => rest_authorization_required_code() ) ); |
| 233 | } |
| 234 | |
| 235 | if ( $this->check_post_for_spam( $post ) ) { |
| 236 | return new WP_Error( |
| 237 | 'email_preview_not_sent', |
| 238 | __( 'Email preview could not be sent.', 'jetpack' ), |
| 239 | array( 'status' => 500 ) |
| 240 | ); |
| 241 | } |
| 242 | |
| 243 | $current_user = wp_get_current_user(); |
| 244 | $email = $current_user->user_email; |
| 245 | |
| 246 | // Try to create a new subscriber with the user's email |
| 247 | $subscriber = Blog_Subscriber::create( $email ); |
| 248 | if ( ! $subscriber ) { |
| 249 | return new WP_Error( 'unverified', __( 'Could not create subscriber.', 'jetpack' ), array( 'status' => rest_authorization_required_code() ) ); |
| 250 | } |
| 251 | |
| 252 | // Send the post to the subscriber |
| 253 | require_once ABSPATH . 'wp-content/mu-plugins/email-subscriptions/subscription-mailer.php'; |
| 254 | $mailer = new Subscription_Mailer( $subscriber ); |
| 255 | $subscription = $subscriber->get_subscription( get_current_blog_id() ); |
| 256 | |
| 257 | /** |
| 258 | * Fires immediately before an email preview is dispatched to the current user. |
| 259 | * |
| 260 | * Useful for inspecting the post content with an external classifier (e.g. an |
| 261 | * LLM-based content moderator) or for logging outbound previews. Fires only |
| 262 | * after the Akismet spam check has passed and the subscriber has been |
| 263 | * resolved, so handlers receive a post that is about to be sent. |
| 264 | * |
| 265 | * @module subscriptions |
| 266 | * |
| 267 | * @since 15.8 |
| 268 | * |
| 269 | * @param WP_Post $post The post being previewed. |
| 270 | * @param Blog_Subscriber $subscriber The subscriber receiving the preview. |
| 271 | * @param Blog_Subscription|false $subscription The subscriber's subscription for the current blog, or false if none exists. |
| 272 | */ |
| 273 | do_action( 'jetpack_before_send_email_preview', $post, $subscriber, $subscription ); |
| 274 | |
| 275 | $mailer->send_post( $post, $subscription ); |
| 276 | |
| 277 | // Return a response |
| 278 | return new WP_REST_Response( 'Email preview sent successfully.', 200 ); |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | wpcom_rest_api_v2_load_plugin( 'WPCOM_REST_API_V2_Endpoint_Send_Email_Preview' ); |