JezK

Edit File: zoho-auth.php

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);

// Manually include wp-config.php to ensure credentials are accessible
require_once('/home/authentica.com/public_html/wp-config.php');

// Ensure this file is accessed within WordPress
if (!defined('ABSPATH')) {
    exit; // Prevent direct access
}

// Security headers for any JSON output from this file
function _za_header_json() {
    header('Content-Type: application/json');
    header('X-Content-Type-Options: nosniff');
    header('X-Frame-Options: DENY');
    header('Referrer-Policy: no-referrer');
}

// Fetch credentials from wp-config.php
$client_id     = defined('ZOHO_CLIENT_ID')     ? ZOHO_CLIENT_ID     : null;
$client_secret = defined('ZOHO_CLIENT_SECRET') ? ZOHO_CLIENT_SECRET : null;
$refresh_token = defined('ZOHO_REFRESH_TOKEN') ? ZOHO_REFRESH_TOKEN : null;
$domain        = defined('ZOHO_DOMAIN')        ? ZOHO_DOMAIN        : 'https://accounts.zoho.com';

// Validate that all required credentials are available
if (!$client_id || !$client_secret || !$refresh_token) {
    _za_header_json();
    echo json_encode(['error' => 'Missing Zoho API credentials.']);
    exit;
}

/**
 * Normalize any provided domain to a proper Zoho ACCOUNTS domain.
 * If someone sets ZOHO_DOMAIN to a zohoapis host, we map it to the corresponding accounts host.
 */
function za_normalize_accounts_domain($domain) {
    if (!$domain) return 'https://accounts.zoho.com';
    $d = strtolower(trim($domain));

// ensure scheme
    if (strpos($d, 'http') !== 0) {
        $d = 'https://' . $d;
    }
    // strip trailing slash
    $d = rtrim($d, '/');

// If pointing to zohoapis*, map to the matching accounts host by region
    if (strpos($d, 'zohoapis') !== false) {
        if (strpos($d, '.eu') !== false)     return 'https://accounts.zoho.eu';
        if (strpos($d, '.in') !== false)     return 'https://accounts.zoho.in';
        if (strpos($d, '.com.cn') !== false) return 'https://accounts.zoho.com.cn';
        if (strpos($d, '.com.au') !== false) return 'https://accounts.zoho.com.au';
        return 'https://accounts.zoho.com';
    }

// If not an accounts.zoho.* host, default safely to US
    if (strpos($d, 'accounts.zoho.') === false) {
        return 'https://accounts.zoho.com';
    }
    return $d;
}

$accounts_domain = za_normalize_accounts_domain($domain);

/**
 * Token cache strategy
 * - Prefer WordPress transients if available
 * - Fallback to /tmp file cache (with lock)
 */
define('ZA_TOKEN_TRANSIENT_KEY',      'zoho_access_token_cache_v1');
define('ZA_TOKEN_FILE',               '/tmp/zoho_access_token_cache.json');
define('ZA_TOKEN_LOCK_FILE',          '/tmp/zoho_access_token_cache.lock');
define('ZA_TOKEN_SAFETY_MARGIN_SEC',  120); // refresh 2 minutes early

function za_can_use_wp_transients() {
    return function_exists('get_transient') && function_exists('set_transient');
}

function za_cache_write($access_token, $expires_in) {
    $now        = time();
    $expires_in = max(60, (int)$expires_in);
    $expires_at = $now + $expires_in;

$data = [
        'access_token' => $access_token,
        'expires_at'   => $expires_at,
        'written_at'   => $now,
        'source'       => 'refresh'
    ];

if (za_can_use_wp_transients()) {
        $ttl = max(30, $expires_in - ZA_TOKEN_SAFETY_MARGIN_SEC);
        set_transient(ZA_TOKEN_TRANSIENT_KEY, $data, $ttl);
    }

$tmpFile = ZA_TOKEN_FILE . '.tmp';
    @file_put_contents($tmpFile, json_encode($data, JSON_UNESCAPED_SLASHES));
    @chmod($tmpFile, 0600);
    @rename($tmpFile, ZA_TOKEN_FILE);

return $data;
}

function za_is_token_valid($data) {
    if (!is_array($data) || empty($data['access_token']) || empty($data['expires_at'])) return false;
    return (time() + ZA_TOKEN_SAFETY_MARGIN_SEC) < (int)$data['expires_at'];
}

/**
 * Refresh the token from Zoho OAuth server
 * Returns: ['http_code'=>int,'error'=>string,'response'=>array,'response_raw_excerpt'=>string?]
 */
function za_do_refresh_request($client_id, $client_secret, $refresh_token, $accounts_domain) {
    $token_url = rtrim($accounts_domain, '/') . '/oauth/v2/token';
    $params = [
        "refresh_token" => $refresh_token,
        "client_id"     => $client_id,
        "client_secret" => $client_secret,
        "grant_type"    => "refresh_token"
    ];

$ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $token_url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        "Content-Type: application/x-www-form-urlencoded"
    ]);

$response   = curl_exec($ch);
    $http_code  = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $error_msg  = curl_error($ch);
    curl_close($ch);

$decoded = json_decode($response, true);
    $raw_excerpt = '';
    if (!is_array($decoded)) {
        // Keep a tiny excerpt for debugging (no secrets included)
        $raw_excerpt = substr((string)$response, 0, 300);
        $decoded = [];
    }

return [
        "http_code"             => $http_code,
        "error"                 => $error_msg,
        "response"              => $decoded,
        "response_raw_excerpt"  => $raw_excerpt
    ];
}

/** Lock helpers */
function za_acquire_lock() {
    $fh = @fopen(ZA_TOKEN_LOCK_FILE, 'c');
    if (!$fh) return null;
    if (@flock($fh, LOCK_EX)) return $fh;
    @fclose($fh);
    return null;
}
function za_release_lock($fh) {
    if ($fh) { @flock($fh, LOCK_UN); @fclose($fh); }
}

/**
 * Public: get_zoho_access_token()
 * Returns: ['http_code'=>int,'error'=>string,'response'=>['access_token'=>...,'expires_at'=>...,'source'=>...]]
 */
function get_zoho_access_token() {
    global $client_id, $client_secret, $refresh_token, $accounts_domain;

// 1) Use cached token if still valid
    $cached = za_cache_read();
    if (za_is_token_valid($cached)) {
        return [
            "http_code" => 200,
            "error"     => "",
            "response"  => [
                "access_token" => $cached['access_token'],
                "expires_at"   => $cached['expires_at'],
                "source"       => "cache"
            ]
        ];
    }

// 2) Acquire lock to perform a single refresh across concurrent requests
    $lock = za_acquire_lock();
    if (!$lock) {
        // Could not lock; re-check cache in case another process refreshed it
        $cached2 = za_cache_read();
        if (za_is_token_valid($cached2)) {
            return [
                "http_code" => 200,
                "error"     => "",
                "response"  => [
                    "access_token" => $cached2['access_token'],
                    "expires_at"   => $cached2['expires_at'],
                    "source"       => "cache"
                ]
            ];
        }
        // Proceed without lock as last resort
    }

// 3) Double-check cache under lock
    $cached3 = za_cache_read();
    if (za_is_token_valid($cached3)) {
        za_release_lock($lock);
        return [
            "http_code" => 200,
            "error"     => "",
            "response"  => [
                "access_token" => $cached3['access_token'],
                "expires_at"   => $cached3['expires_at'],
                "source"       => "cache"
            ]
        ];
    }

// 4) Do the refresh
    $refresh = za_do_refresh_request($client_id, $client_secret, $refresh_token, $accounts_domain);

if ($refresh['http_code'] !== 200 || empty($refresh['response']['access_token'])) {
        // Pass through Zoho's error and a small excerpt if body wasn't JSON
        return $refresh;
    }

// 5) Persist and return the new token
    $access_token = $refresh['response']['access_token'];
    $expires_in   = !empty($refresh['response']['expires_in']) ? (int)$refresh['response']['expires_in'] : 3600;
    $stored       = za_cache_write($access_token, $expires_in);

za_release_lock($lock);

return [
        "http_code" => 200,
        "error"     => "",
        "response"  => [
            "access_token" => $stored['access_token'],
            "expires_at"   => $stored['expires_at'],
            "source"       => "refresh"
        ]
    ];
}

// Disabled for security - do not expose token publicly
if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    _za_header_json();
    http_response_code(403);
    echo json_encode(['error' => 'Access denied']);
    exit;
}

JezK

Edit File: zoho-auth.php

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