| 1 |
<?php |
| 2 |
|
| 3 |
namespace BBlocks\Inc; |
| 4 |
|
| 5 |
if ( ! defined( 'ABSPATH' ) ) { |
| 6 |
exit; |
| 7 |
} |
| 8 |
|
| 9 |
class BBlocksInstagram { |
| 10 |
const OPTION = 'b_blocks_instagram'; |
| 11 |
const CACHE_KEY = 'b_blocks_instagram_feed_'; |
| 12 |
|
| 13 |
/** |
| 14 |
* Nonce action for every endpoint in this class. |
| 15 |
* |
| 16 |
* Deliberately NOT the generic 'wp_ajax' the rest of the plugin used to |
| 17 |
* share: a nonce minted for one endpoint should not authenticate a |
| 18 |
* different one. The feed is a nopriv endpoint, so this nonce is public |
| 19 |
* by construction (wp_create_nonce() for a logged-out visitor is the same |
| 20 |
* value for every anonymous visitor) - it is CSRF friction, never access |
| 21 |
* control. Authorization on the privileged endpoints comes from the |
| 22 |
* capability checks below, and abuse of the public endpoint is bounded by |
| 23 |
* the cache floor and the rate limiter in feed(). |
| 24 |
*/ |
| 25 |
const NONCE_ACTION = 'b_blocks_instagram_feed'; |
| 26 |
|
| 27 |
const CACHE_MIN_MINUTES = 5; |
| 28 |
|
| 29 |
const CACHE_MAX_MINUTES = 10080; |
| 30 |
|
| 31 |
const LOCK_SECONDS = 20; |
| 32 |
|
| 33 |
/** |
| 34 |
* Upstream Instagram fetches allowed per IP, per window, for callers who |
| 35 |
* cannot edit posts. Cache *hits* are never counted - only a cache miss |
| 36 |
* that would hit graph.instagram.com consumes budget, so ordinary visitors |
| 37 |
* loading a cached feed are unaffected no matter how many times they load |
| 38 |
* the page. |
| 39 |
*/ |
| 40 |
const PUBLIC_FETCH_MAX = 5; |
| 41 |
const PUBLIC_FETCH_WINDOW = 300; |
| 42 |
|
| 43 |
public function __construct() { |
| 44 |
add_action( 'init', [ $this, 'register_option' ] ); |
| 45 |
add_action( 'wp_ajax_bBlocksInstagramFeed', [ $this, 'feed' ] ); |
| 46 |
add_action( 'wp_ajax_nopriv_bBlocksInstagramFeed', [ $this, 'feed' ] ); |
| 47 |
add_action( 'wp_ajax_bBlocksInstagramClearCache', [ $this, 'clear_cache' ] ); |
| 48 |
add_action( 'wp_ajax_bBlocksInstagramGetAccount', [ $this, 'get_account' ] ); |
| 49 |
add_action( 'wp_ajax_bBlocksInstagramSaveAccount', [ $this, 'save_account' ] ); |
| 50 |
add_action( 'wp_enqueue_scripts', [ $this, 'localize' ], 20 ); |
| 51 |
add_action( 'enqueue_block_editor_assets', [ $this, 'localize' ], 20 ); |
| 52 |
} |
| 53 |
|
| 54 |
public function register_option() { |
| 55 |
register_setting( |
| 56 |
'options', |
| 57 |
self::OPTION, |
| 58 |
[ |
| 59 |
'type' => 'object', |
| 60 |
'default' => [ 'accounts' => [] ], |
| 61 |
'show_in_rest' => false, |
| 62 |
] |
| 63 |
); |
| 64 |
} |
| 65 |
|
| 66 |
public function localize() { |
| 67 |
foreach ( [ 'b-blocks-instagram-view-script', 'b-blocks-index-script' ] as $handle ) { |
| 68 |
if ( wp_script_is( $handle, 'registered' ) ) { |
| 69 |
wp_localize_script( |
| 70 |
$handle, |
| 71 |
'bBlocksInstagram', |
| 72 |
[ |
| 73 |
'ajaxUrl' => admin_url( 'admin-ajax.php' ), |
| 74 |
'nonce' => wp_create_nonce( self::NONCE_ACTION ), |
| 75 |
] |
| 76 |
); |
| 77 |
} |
| 78 |
} |
| 79 |
} |
| 80 |
|
| 81 |
private function accounts() { |
| 82 |
$data = get_option( self::OPTION, [] ); |
| 83 |
|
| 84 |
return isset( $data['accounts'] ) && is_array( $data['accounts'] ) ? $data['accounts'] : []; |
| 85 |
} |
| 86 |
|
| 87 |
|
| 88 |
public static function dashboard_token() { |
| 89 |
$keys = get_option( 'bBlocksApiKeys', [] ); |
| 90 |
|
| 91 |
return is_array( $keys ) ? (string) ( $keys['instagram']['key'] ?? '' ) : ''; |
| 92 |
} |
| 93 |
|
| 94 |
|
| 95 |
private function token_for( $account ) { |
| 96 |
$dashboard = self::dashboard_token(); |
| 97 |
|
| 98 |
return '' !== $dashboard ? $dashboard : (string) ( $account['token'] ?? '' ); |
| 99 |
} |
| 100 |
|
| 101 |
|
| 102 |
private function find_account( $wanted ) { |
| 103 |
$dashboard = self::dashboard_token(); |
| 104 |
|
| 105 |
if ( '' !== $dashboard ) { |
| 106 |
return [ 'id' => '', 'username' => $wanted, 'token' => $dashboard ]; |
| 107 |
} |
| 108 |
|
| 109 |
foreach ( $this->accounts() as $account ) { |
| 110 |
if ( '' === $wanted || ( $account['username'] ?? '' ) === $wanted || (string) ( $account['id'] ?? '' ) === (string) $wanted ) { |
| 111 |
return $account; |
| 112 |
} |
| 113 |
} |
| 114 |
|
| 115 |
return null; |
| 116 |
} |
| 117 |
|
| 118 |
private function guard() { |
| 119 |
$nonce = sanitize_text_field( wp_unslash( $_POST['nonce'] ?? '' ) ); |
| 120 |
|
| 121 |
if ( ! wp_verify_nonce( $nonce, self::NONCE_ACTION ) || ! current_user_can( 'manage_options' ) ) { |
| 122 |
wp_send_json_error( __( 'Invalid request.', 'b-blocks' ) ); |
| 123 |
} |
| 124 |
} |
| 125 |
|
| 126 |
public function get_account() { |
| 127 |
$nonce = sanitize_text_field( wp_unslash( $_POST['nonce'] ?? '' ) ); |
| 128 |
|
| 129 |
if ( ! wp_verify_nonce( $nonce, self::NONCE_ACTION ) || ! current_user_can( 'edit_posts' ) ) { |
| 130 |
wp_send_json_error( __( 'Invalid request.', 'b-blocks' ) ); |
| 131 |
} |
| 132 |
|
| 133 |
$account = $this->accounts()[0] ?? []; |
| 134 |
$dashboard = self::dashboard_token(); |
| 135 |
|
| 136 |
wp_send_json_success( |
| 137 |
[ |
| 138 |
'username' => $account['username'] ?? '', |
| 139 |
'hasToken' => '' !== $dashboard || '' !== ( $account['token'] ?? '' ), |
| 140 |
'fromDashboard' => '' !== $dashboard, |
| 141 |
] |
| 142 |
); |
| 143 |
} |
| 144 |
|
| 145 |
public function save_account() { |
| 146 |
$this->guard(); |
| 147 |
|
| 148 |
$account = $this->accounts()[0] ?? []; |
| 149 |
$username = sanitize_text_field( wp_unslash( $_POST['username'] ?? '' ) ); |
| 150 |
$token = sanitize_text_field( wp_unslash( $_POST['token'] ?? '' ) ); |
| 151 |
|
| 152 |
$saved = [ |
| 153 |
'id' => $account['id'] ?? '', |
| 154 |
'username' => $username, |
| 155 |
'token' => '' === $token ? ( $account['token'] ?? '' ) : $token, |
| 156 |
]; |
| 157 |
|
| 158 |
update_option( self::OPTION, [ 'accounts' => '' === $saved['username'] && '' === $saved['token'] ? [] : [ $saved ] ] ); |
| 159 |
|
| 160 |
self::flush(); |
| 161 |
|
| 162 |
wp_send_json_success( [ 'username' => $saved['username'], 'hasToken' => ! empty( $saved['token'] ) ] ); |
| 163 |
} |
| 164 |
|
| 165 |
public static function test_token( $token ) { |
| 166 |
$token = trim( (string) $token ); |
| 167 |
|
| 168 |
if ( '' === $token ) { |
| 169 |
return [ 'valid' => false, 'message' => __( 'No access token provided', 'b-blocks' ) ]; |
| 170 |
} |
| 171 |
|
| 172 |
$res = wp_remote_get( add_query_arg( |
| 173 |
[ 'fields' => 'id,username', 'access_token' => $token ], |
| 174 |
'https://graph.instagram.com/me' |
| 175 |
), [ 'timeout' => 10 ] ); |
| 176 |
|
| 177 |
if ( is_wp_error( $res ) ) { |
| 178 |
return [ 'valid' => false, 'message' => 'Connection failed: ' . $res->get_error_message() ]; |
| 179 |
} |
| 180 |
|
| 181 |
$body = json_decode( wp_remote_retrieve_body( $res ), true ); |
| 182 |
|
| 183 |
if ( isset( $body['error']['message'] ) ) { |
| 184 |
return [ 'valid' => false, 'message' => $body['error']['message'] ]; |
| 185 |
} |
| 186 |
|
| 187 |
if ( empty( $body['username'] ) ) { |
| 188 |
return [ 'valid' => false, 'message' => __( 'Instagram did not return an account for this token', 'b-blocks' ) ]; |
| 189 |
} |
| 190 |
|
| 191 |
self::flush(); |
| 192 |
|
| 193 |
return [ 'valid' => true, 'message' => sprintf( '%s @%s', __( 'Connected as', 'b-blocks' ), $body['username'] ) ]; |
| 194 |
} |
| 195 |
|
| 196 |
public function feed() { |
| 197 |
$nonce = sanitize_text_field( wp_unslash( $_POST['nonce'] ?? '' ) ); |
| 198 |
|
| 199 |
if ( ! wp_verify_nonce( $nonce, self::NONCE_ACTION ) ) { |
| 200 |
wp_send_json_error( __( 'Invalid request.', 'b-blocks' ) ); |
| 201 |
} |
| 202 |
|
| 203 |
$wanted = sanitize_text_field( wp_unslash( $_POST['account'] ?? '' ) ); |
| 204 |
$limit = min( 100, max( 1, absint( $_POST['limit'] ?? 50 ) ) ); |
| 205 |
$minutes = $this->cache_minutes( $_POST['cache'] ?? 30 ); |
| 206 |
$account = $this->find_account( $wanted ); |
| 207 |
|
| 208 |
$token = $account ? $this->token_for( $account ) : ''; |
| 209 |
|
| 210 |
if ( '' === $token ) { |
| 211 |
wp_send_json_error( __( 'No Instagram account is connected. Add an access token under Dashboard → Settings → API Integrations.', 'b-blocks' ) ); |
| 212 |
} |
| 213 |
|
| 214 |
$privileged = current_user_can( 'edit_posts' ); |
| 215 |
$bucket = $this->fetch_bucket( $limit, $privileged ); |
| 216 |
$cache_key = self::CACHE_KEY . md5( $token . '|' . $bucket ); |
| 217 |
$cached = $minutes ? get_transient( $cache_key ) : false; |
| 218 |
|
| 219 |
if ( false !== $cached ) { |
| 220 |
wp_send_json_success( $this->take( $cached, $limit ) ); |
| 221 |
} |
| 222 |
|
| 223 |
$lock = $cache_key . '_lock'; |
| 224 |
|
| 225 |
if ( get_transient( $lock ) ) { |
| 226 |
wp_send_json_error( __( 'The Instagram feed is being refreshed. Please try again in a moment.', 'b-blocks' ) ); |
| 227 |
} |
| 228 |
|
| 229 |
// Past this point the request costs an outbound call to Instagram. |
| 230 |
// Everything above is served from cache, so the limiter sits here |
| 231 |
// rather than at the top of the method: normal visitors on a warm |
| 232 |
// cache never touch it, and only the callers actually driving |
| 233 |
// upstream traffic spend budget. |
| 234 |
if ( ! $privileged ) { |
| 235 |
$this->throttle_fetch(); |
| 236 |
} |
| 237 |
|
| 238 |
set_transient( $lock, 1, self::LOCK_SECONDS ); |
| 239 |
|
| 240 |
$payload = $this->fetch( $token, $bucket ); |
| 241 |
|
| 242 |
delete_transient( $lock ); |
| 243 |
|
| 244 |
if ( is_wp_error( $payload ) ) { |
| 245 |
wp_send_json_error( $payload->get_error_message() ); |
| 246 |
} |
| 247 |
|
| 248 |
if ( $minutes ) { |
| 249 |
set_transient( $cache_key, $payload, $minutes * MINUTE_IN_SECONDS ); |
| 250 |
} |
| 251 |
|
| 252 |
wp_send_json_success( $this->take( $payload, $limit ) ); |
| 253 |
} |
| 254 |
|
| 255 |
private function cache_minutes( $requested ) { |
| 256 |
$minutes = min( self::CACHE_MAX_MINUTES, absint( $requested ) ); |
| 257 |
|
| 258 |
if ( current_user_can( 'edit_posts' ) ) { |
| 259 |
return $minutes; |
| 260 |
} |
| 261 |
|
| 262 |
$floor = (int) apply_filters( 'b_blocks_instagram_min_cache_minutes', self::CACHE_MIN_MINUTES ); |
| 263 |
|
| 264 |
return max( $floor, $minutes ); |
| 265 |
} |
| 266 |
|
| 267 |
/** |
| 268 |
* Per-IP throttle on cache-missing feed requests. |
| 269 |
* |
| 270 |
* Sends a 429 and exits when the caller is over budget. Mirrors the |
| 271 |
* counter in BBlocksOptinRateLimit but with its own window, because a |
| 272 |
* feed refresh and a form submission are not the same kind of traffic. |
| 273 |
*/ |
| 274 |
private function throttle_fetch() { |
| 275 |
$max = (int) apply_filters( 'b_blocks_instagram_public_fetch_max', self::PUBLIC_FETCH_MAX ); |
| 276 |
$window = (int) apply_filters( 'b_blocks_instagram_public_fetch_window', self::PUBLIC_FETCH_WINDOW ); |
| 277 |
|
| 278 |
if ( $max <= 0 || $window <= 0 ) { |
| 279 |
return; |
| 280 |
} |
| 281 |
|
| 282 |
$key = 'bb_ig_rl_' . md5( $this->client_ip() ); |
| 283 |
$hits = (int) get_transient( $key ); |
| 284 |
|
| 285 |
if ( $hits >= $max ) { |
| 286 |
wp_send_json_error( __( 'Too many Instagram refreshes. Please wait a moment and try again.', 'b-blocks' ), 429 ); |
| 287 |
} |
| 288 |
|
| 289 |
// The expiry is never refreshed on later hits, so the window rolls |
| 290 |
// from the first request rather than sliding forward forever. |
| 291 |
set_transient( $key, $hits + 1, $window ); |
| 292 |
} |
| 293 |
|
| 294 |
/** |
| 295 |
* Client IP for the throttle key, validated so a spoofed proxy header |
| 296 |
* cannot inject arbitrary text into the transient name. A spoofed value |
| 297 |
* only changes which bucket the caller lands in; it does not skip the |
| 298 |
* check. |
| 299 |
*/ |
| 300 |
private function client_ip() { |
| 301 |
$candidates = []; |
| 302 |
|
| 303 |
if ( isset( $_SERVER['HTTP_CF_CONNECTING_IP'] ) ) { |
| 304 |
$candidates[] = sanitize_text_field( wp_unslash( $_SERVER['HTTP_CF_CONNECTING_IP'] ) ); |
| 305 |
} |
| 306 |
|
| 307 |
if ( isset( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) { |
| 308 |
$forwarded = explode( ',', sanitize_text_field( wp_unslash( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) ); |
| 309 |
$candidates[] = trim( $forwarded[0] ); |
| 310 |
} |
| 311 |
|
| 312 |
if ( isset( $_SERVER['REMOTE_ADDR'] ) ) { |
| 313 |
$candidates[] = sanitize_text_field( wp_unslash( $_SERVER['REMOTE_ADDR'] ) ); |
| 314 |
} |
| 315 |
|
| 316 |
foreach ( $candidates as $candidate ) { |
| 317 |
$ip = filter_var( trim( $candidate ), FILTER_VALIDATE_IP ); |
| 318 |
|
| 319 |
if ( false !== $ip ) { |
| 320 |
return $ip; |
| 321 |
} |
| 322 |
} |
| 323 |
|
| 324 |
return '0.0.0.0'; |
| 325 |
} |
| 326 |
|
| 327 |
/** |
| 328 |
* Size of the upstream request, which is also what varies the cache key. |
| 329 |
* |
| 330 |
* For callers who cannot edit posts this is pinned to the maximum, so a |
| 331 |
* public caller gets exactly one cache entry per token. Letting `limit` |
| 332 |
* pick the bucket gave them four (25/50/75/100) and therefore four ways |
| 333 |
* to force an upstream fetch inside one cache window. take() slices the |
| 334 |
* payload back down to the requested count either way, so the response |
| 335 |
* is unchanged. |
| 336 |
*/ |
| 337 |
private function fetch_bucket( $limit, $privileged = false ) { |
| 338 |
if ( ! $privileged ) { |
| 339 |
return 100; |
| 340 |
} |
| 341 |
|
| 342 |
return (int) min( 100, ceil( $limit / 25 ) * 25 ); |
| 343 |
} |
| 344 |
|
| 345 |
private function take( $payload, $limit ) { |
| 346 |
if ( isset( $payload['media'] ) && is_array( $payload['media'] ) ) { |
| 347 |
$payload['media'] = array_slice( $payload['media'], 0, $limit ); |
| 348 |
} |
| 349 |
|
| 350 |
return $payload; |
| 351 |
} |
| 352 |
|
| 353 |
private function user( $token ) { |
| 354 |
$sets = [ |
| 355 |
'id,username,media_count,account_type,name,profile_picture_url,followers_count', |
| 356 |
'id,username,media_count,account_type', |
| 357 |
]; |
| 358 |
|
| 359 |
foreach ( $sets as $fields ) { |
| 360 |
$res = wp_remote_get( add_query_arg( |
| 361 |
[ 'fields' => $fields, 'access_token' => $token ], |
| 362 |
'https://graph.instagram.com/me' |
| 363 |
), [ 'timeout' => 15 ] ); |
| 364 |
|
| 365 |
if ( is_wp_error( $res ) ) { |
| 366 |
return $res; |
| 367 |
} |
| 368 |
|
| 369 |
$body = json_decode( wp_remote_retrieve_body( $res ), true ); |
| 370 |
|
| 371 |
if ( ! isset( $body['error'] ) ) { |
| 372 |
return $body; |
| 373 |
} |
| 374 |
|
| 375 |
$last = $body; |
| 376 |
} |
| 377 |
|
| 378 |
return new \WP_Error( 'b_blocks_instagram', $last['error']['message'] ?? __( 'Instagram rejected the request.', 'b-blocks' ) ); |
| 379 |
} |
| 380 |
|
| 381 |
private function fetch( $token, $limit ) { |
| 382 |
$fields = 'id,username,media_type,media_url,thumbnail_url,caption,permalink,timestamp,children{id,media_type,media_url,thumbnail_url,permalink}'; |
| 383 |
|
| 384 |
$user = $this->user( $token ); |
| 385 |
|
| 386 |
if ( is_wp_error( $user ) ) { |
| 387 |
return $user; |
| 388 |
} |
| 389 |
|
| 390 |
$media_res = wp_remote_get( add_query_arg( |
| 391 |
[ 'fields' => $fields, 'access_token' => $token, 'limit' => $limit ], |
| 392 |
'https://graph.instagram.com/me/media' |
| 393 |
), [ 'timeout' => 15 ] ); |
| 394 |
|
| 395 |
if ( is_wp_error( $media_res ) ) { |
| 396 |
return $media_res; |
| 397 |
} |
| 398 |
|
| 399 |
$media = json_decode( wp_remote_retrieve_body( $media_res ), true ); |
| 400 |
|
| 401 |
if ( isset( $media['error']['message'] ) ) { |
| 402 |
return new \WP_Error( 'b_blocks_instagram', $media['error']['message'] ); |
| 403 |
} |
| 404 |
|
| 405 |
return [ |
| 406 |
'user' => [ |
| 407 |
'id' => $user['id'] ?? '', |
| 408 |
'username' => $user['username'] ?? '', |
| 409 |
'name' => $user['name'] ?? '', |
| 410 |
'profile_picture_url' => $user['profile_picture_url'] ?? '', |
| 411 |
'followers_count' => $user['followers_count'] ?? 0, |
| 412 |
'mediaCount' => $user['media_count'] ?? 0, |
| 413 |
'accountType' => $user['account_type'] ?? '', |
| 414 |
], |
| 415 |
'media' => array_values( $media['data'] ?? [] ), |
| 416 |
]; |
| 417 |
} |
| 418 |
|
| 419 |
public function clear_cache() { |
| 420 |
$nonce = sanitize_text_field( wp_unslash( $_POST['nonce'] ?? '' ) ); |
| 421 |
|
| 422 |
if ( ! wp_verify_nonce( $nonce, self::NONCE_ACTION ) || ! current_user_can( 'edit_posts' ) ) { |
| 423 |
wp_send_json_error( __( 'Invalid request.', 'b-blocks' ) ); |
| 424 |
} |
| 425 |
|
| 426 |
self::flush(); |
| 427 |
|
| 428 |
wp_send_json_success(); |
| 429 |
} |
| 430 |
|
| 431 |
public static function flush() { |
| 432 |
global $wpdb; |
| 433 |
|
| 434 |
$wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s", '_transient_' . self::CACHE_KEY . '%' ) ); |
| 435 |
} |
| 436 |
} |
| 437 |
|
| 438 |
new BBlocksInstagram(); |
