| 1 |
<?php |
| 2 |
|
| 3 |
/** |
| 4 |
* Settings Class |
| 5 |
* |
| 6 |
* Handles plugin settings and configuration using WordPress options |
| 7 |
* |
| 8 |
* @package ThinkRank\Core |
| 9 |
* @since 1.0.0 |
| 10 |
*/ |
| 11 |
|
| 12 |
declare(strict_types=1); |
| 13 |
|
| 14 |
namespace ThinkRank\Core; |
| 15 |
|
| 16 |
// Prevent direct access |
| 17 |
if (!defined('ABSPATH')) { |
| 18 |
exit; |
| 19 |
} |
| 20 |
|
| 21 |
/** |
| 22 |
* Settings Class |
| 23 |
* |
| 24 |
* Single Responsibility: Manage plugin settings and configuration |
| 25 |
* Uses WordPress options for storage |
| 26 |
* |
| 27 |
* @since 1.0.0 |
| 28 |
*/ |
| 29 |
class Settings { |
| 30 |
|
| 31 |
/** |
| 32 |
* Settings cache |
| 33 |
* |
| 34 |
* @var array |
| 35 |
*/ |
| 36 |
private array $cache = []; |
| 37 |
|
| 38 |
/** |
| 39 |
* Default settings |
| 40 |
* |
| 41 |
* @var array |
| 42 |
*/ |
| 43 |
private array $defaults = [ |
| 44 |
// AI Settings |
| 45 |
'ai_provider' => 'openai', |
| 46 |
'openai_api_key' => '', |
| 47 |
'openai_model' => 'gpt-5-nano', // Default to GPT‑5‑nano |
| 48 |
'claude_api_key' => '', |
| 49 |
'claude_model' => 'claude-3-7-sonnet-latest', // Use latest stable Claude |
| 50 |
'gemini_api_key' => '', |
| 51 |
'gemini_model' => 'gemini-2.5-flash', |
| 52 |
'max_tokens' => 1000, |
| 53 |
'temperature' => 0.7, |
| 54 |
|
| 55 |
// Google API Keys (encrypted) |
| 56 |
'google_analytics_api_key' => '', |
| 57 |
'google_search_console_api_key' => '', |
| 58 |
'google_pagespeed_api_key' => '', |
| 59 |
|
| 60 |
// Google OAuth Tokens (encrypted) |
| 61 |
'google_access_token' => '', |
| 62 |
'google_refresh_token' => '', |
| 63 |
'google_token_expires_in' => 0, |
| 64 |
'google_token_created' => 0, |
| 65 |
'google_account_connected' => false, |
| 66 |
|
| 67 |
// Google Analytics Pro Settings |
| 68 |
'ga_analytics_account_id' => '', |
| 69 |
'ga_analytics_data_stream_id' => '', |
| 70 |
|
| 71 |
// Performance Settings |
| 72 |
'cache_duration' => 3600, |
| 73 |
'max_requests_per_minute' => 10, |
| 74 |
'enable_logging' => true, |
| 75 |
|
| 76 |
// Integration Settings |
| 77 |
'api_timeout' => 30, |
| 78 |
'enable_rate_limiting' => true, |
| 79 |
'auto_test_connections' => true, |
| 80 |
'retry_failed_requests' => true, |
| 81 |
|
| 82 |
// Social Platform Settings |
| 83 |
// Public IDs (not encrypted) |
| 84 |
'facebook_app_id' => '', |
| 85 |
'facebook_admins' => '', |
| 86 |
'youtube_channel_id' => '', |
| 87 |
'whatsapp_business_id' => '', |
| 88 |
// Verification codes (encrypted) |
| 89 |
'pinterest_site_verification' => '', |
| 90 |
'instagram_verification' => '', |
| 91 |
'tiktok_verification' => '', |
| 92 |
|
| 93 |
// SEO Settings |
| 94 |
'auto_optimize' => false, |
| 95 |
'seo_score_threshold' => 70, |
| 96 |
'enable_meta_generation' => true, |
| 97 |
'enable_schema_markup' => true, |
| 98 |
|
| 99 |
// Author Archives Settings |
| 100 |
'author_archives_enabled' => true, |
| 101 |
'author_archives_index' => true, |
| 102 |
'author_archives_show_empty' => false, |
| 103 |
'author_archives_title' => '%author_name% – %site_title% %page%', |
| 104 |
'author_archives_meta_desc' => 'Articles written by %author_name% on %site_title%', |
| 105 |
|
| 106 |
// UI Settings |
| 107 |
'show_welcome_message' => true, |
| 108 |
'dashboard_widgets' => ['seo_score', 'ai_usage', 'recent_briefs'], |
| 109 |
'editor_panel_position' => 'side', |
| 110 |
|
| 111 |
// Advanced Settings |
| 112 |
'debug_mode' => false, |
| 113 |
'retry_attempts' => 3, |
| 114 |
|
| 115 |
// Privacy Settings |
| 116 |
'data_retention_days' => 90, |
| 117 |
'anonymize_logs' => true, |
| 118 |
'share_usage_data' => false, |
| 119 |
|
| 120 |
// Integration Settings |
| 121 |
'google_analytics_id' => '', |
| 122 |
'search_console_property' => '', |
| 123 |
|
| 124 |
// GA4 Tracking Settings |
| 125 |
'ga4_measurement_id' => '', |
| 126 |
'ga4_auto_inject' => false, |
| 127 |
'ga4_anonymize_ip' => false, |
| 128 |
'ga4_exclude_admin' => false, |
| 129 |
'ga4_tracking_verified' => false, |
| 130 |
'ga4_last_verification' => '', |
| 131 |
|
| 132 |
// SEO Analytics Settings |
| 133 |
'seo_analytics_enabled' => false, |
| 134 |
'seo_analytics_setup_completed' => false, |
| 135 |
'seo_analytics_google_analytics_property_id' => '', |
| 136 |
'search_console_property' => '', |
| 137 |
'seo_analytics_enable_ai_insights' => true, |
| 138 |
'seo_analytics_enable_automated_alerts' => false, |
| 139 |
'seo_analytics_enable_predictive_analysis' => false, |
| 140 |
'seo_analytics_monitoring_frequency' => 3600, |
| 141 |
'seo_analytics_alert_thresholds' => [], |
| 142 |
'seo_analytics_report_schedule' => 'weekly', |
| 143 |
'seo_analytics_data_retention_days' => 90, |
| 144 |
'seo_analytics_cache_analytics_data' => true, |
| 145 |
|
| 146 |
// Uninstall Settings |
| 147 |
'keep_data_on_uninstall' => true, |
| 148 |
]; |
| 149 |
|
| 150 |
/** |
| 151 |
* Encrypted settings keys |
| 152 |
* |
| 153 |
* @var array |
| 154 |
*/ |
| 155 |
private array $encrypted_keys = [ |
| 156 |
// AI API Keys |
| 157 |
'openai_api_key', |
| 158 |
'claude_api_key', |
| 159 |
'gemini_api_key', |
| 160 |
// Google API Keys |
| 161 |
'google_analytics_api_key', |
| 162 |
'google_search_console_api_key', |
| 163 |
'google_pagespeed_api_key', |
| 164 |
'google_access_token', |
| 165 |
'google_refresh_token', |
| 166 |
// Social Platform Verification Codes (sensitive) |
| 167 |
'pinterest_site_verification', |
| 168 |
'instagram_verification', |
| 169 |
'tiktok_verification', |
| 170 |
]; |
| 171 |
|
| 172 |
/** |
| 173 |
* Initialize settings |
| 174 |
* |
| 175 |
* @return void |
| 176 |
*/ |
| 177 |
public function init(): void { |
| 178 |
add_action('admin_init', [$this, 'register_settings']); |
| 179 |
} |
| 180 |
|
| 181 |
/** |
| 182 |
* Register WordPress settings |
| 183 |
* |
| 184 |
* @return void |
| 185 |
*/ |
| 186 |
public function register_settings(): void { |
| 187 |
register_setting('thinkrank_settings', 'thinkrank_settings', [ |
| 188 |
'sanitize_callback' => [$this, 'sanitize_settings'], |
| 189 |
'default' => $this->defaults, |
| 190 |
]); |
| 191 |
} |
| 192 |
|
| 193 |
/** |
| 194 |
* Get setting value |
| 195 |
* |
| 196 |
* @param string $key Setting key |
| 197 |
* @param mixed $default Default value |
| 198 |
* @param int $user_id User ID (0 for global, >0 for user-specific) |
| 199 |
* @return mixed Setting value |
| 200 |
*/ |
| 201 |
public function get(string $key, $default = null, int $user_id = 0) { |
| 202 |
// Check cache first |
| 203 |
$cache_key = $user_id > 0 ? "user_{$user_id}_{$key}" : $key; |
| 204 |
|
| 205 |
if (isset($this->cache[$cache_key])) { |
| 206 |
return $this->maybe_decrypt($key, $this->cache[$cache_key]); |
| 207 |
} |
| 208 |
|
| 209 |
// Load from WordPress options or user meta |
| 210 |
if ($user_id > 0) { |
| 211 |
$value = get_user_meta($user_id, "thinkrank_{$key}", true); |
| 212 |
} else { |
| 213 |
$value = get_option("thinkrank_{$key}", null); |
| 214 |
} |
| 215 |
|
| 216 |
|
| 217 |
|
| 218 |
// Handle boolean settings with special logic for WordPress storage quirks |
| 219 |
if (isset($this->defaults[$key]) && is_bool($this->defaults[$key])) { |
| 220 |
// Convert string representations back to booleans |
| 221 |
if ('1' === $value || 1 === $value || true === $value || 'true' === $value) { |
| 222 |
$value = true; |
| 223 |
} elseif ('0' === $value || 0 === $value || false === $value || 'false' === $value) { |
| 224 |
$value = false; |
| 225 |
} elseif (null === $value || '' === $value) { |
| 226 |
// For boolean settings, empty string could mean false was stored |
| 227 |
// Check if this setting was explicitly set by looking for the option |
| 228 |
$option_exists = get_option("thinkrank_{$key}", 'OPTION_NOT_FOUND') !== 'OPTION_NOT_FOUND'; |
| 229 |
if ($option_exists && $value === '') { |
| 230 |
// Empty string exists in DB, this likely means false was stored |
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$value = false; |
| 232 |
} else { |
| 233 |
// Option doesn't exist, use default |
| 234 |
$value = $default ?? $this->defaults[$key]; |
| 235 |
} |
| 236 |
} |
| 237 |
} else { |
| 238 |
// Non-boolean settings: use default if not found |
| 239 |
if (null === $value || '' === $value) { |
| 240 |
$value = $default ?? ($this->defaults[$key] ?? null); |
| 241 |
} |
| 242 |
} |
| 243 |
|
| 244 |
// Cache the value |
| 245 |
$this->cache[$cache_key] = $value; |
| 246 |
|
| 247 |
return $this->maybe_decrypt($key, $value); |
| 248 |
} |
| 249 |
|
| 250 |
/** |
| 251 |
* Set setting value |
| 252 |
* |
| 253 |
* @param string $key Setting key |
| 254 |
* @param mixed $value Setting value |
| 255 |
* @param int $user_id User ID (0 for global, >0 for user-specific) |
| 256 |
* @return bool Success status |
| 257 |
*/ |
| 258 |
public function set(string $key, $value, int $user_id = 0): bool { |
| 259 |
// Check if key exists in defaults |
| 260 |
if (!array_key_exists($key, $this->defaults)) { |
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return false; |
| 262 |
} |
| 263 |
|
| 264 |
|
| 265 |
|
| 266 |
// Encrypt if needed |
| 267 |
$encrypted_value = $this->maybe_encrypt($key, $value); |
| 268 |
|
| 269 |
// Save to WordPress options or user meta |
| 270 |
if ($user_id > 0) { |
| 271 |
$result = update_user_meta($user_id, "thinkrank_{$key}", $encrypted_value); |
| 272 |
} else { |
| 273 |
$option_name = "thinkrank_{$key}"; |
| 274 |
$is_sensitive = in_array($key, $this->encrypted_keys, true); |
| 275 |
|
| 276 |
// Determine if option exists |
| 277 |
$existing = get_option($option_name, '__tr_not_set__'); |
| 278 |
if ($existing === '__tr_not_set__') { |
| 279 |
// First-time save: set autoload=no for sensitive options |
| 280 |
$autoload = $is_sensitive ? 'no' : 'yes'; |
| 281 |
$result = add_option($option_name, $encrypted_value, '', $autoload); |
| 282 |
} else { |
| 283 |
// Update existing option; enforce autoload=no for sensitive options |
| 284 |
if ($is_sensitive) { |
| 285 |
$result = update_option($option_name, $encrypted_value, 'no'); |
| 286 |
} else { |
| 287 |
$result = update_option($option_name, $encrypted_value); |
| 288 |
} |
| 289 |
} |
| 290 |
|
| 291 |
// Verify value actually saved (update_option returns false when unchanged) |
| 292 |
$saved_value = get_option($option_name, 'NOT_FOUND'); |
| 293 |
$values_match = ($saved_value === $encrypted_value) || |
| 294 |
($saved_value == $encrypted_value && $encrypted_value !== 'NOT_FOUND'); |
| 295 |
|
| 296 |
// Consider it successful if the value was saved correctly |
| 297 |
$result = $result || $values_match; |
| 298 |
} |
| 299 |
|
| 300 |
// Update cache |
| 301 |
if ($result) { |
| 302 |
$cache_key = $user_id > 0 ? "user_{$user_id}_{$key}" : $key; |
| 303 |
$this->cache[$cache_key] = $encrypted_value; |
| 304 |
|
| 305 |
// Invalidate bulk cache when individual setting changes |
| 306 |
$bulk_cache_key = $user_id > 0 ? "bulk_user_{$user_id}" : 'bulk_global'; |
| 307 |
wp_cache_delete($bulk_cache_key, 'thinkrank_settings'); |
| 308 |
} |
| 309 |
|
| 310 |
return $result !== false; |
| 311 |
} |
| 312 |
|
| 313 |
/** |
| 314 |
* Delete setting |
| 315 |
* |
| 316 |
* @param string $key Setting key |
| 317 |
* @param int $user_id User ID (0 for global, >0 for user-specific) |
| 318 |
* @return bool Success status |
| 319 |
*/ |
| 320 |
public function delete(string $key, int $user_id = 0): bool { |
| 321 |
// Remove from WordPress options or user meta |
| 322 |
if ($user_id > 0) { |
| 323 |
$result = delete_user_meta($user_id, "thinkrank_{$key}"); |
| 324 |
} else { |
| 325 |
$result = delete_option("thinkrank_{$key}"); |
| 326 |
} |
| 327 |
|
| 328 |
// Remove from cache |
| 329 |
if ($result) { |
| 330 |
$cache_key = $user_id > 0 ? "user_{$user_id}_{$key}" : $key; |
| 331 |
unset($this->cache[$cache_key]); |
| 332 |
} |
| 333 |
|
| 334 |
return $result; |
| 335 |
} |
| 336 |
|
| 337 |
/** |
| 338 |
* Get all settings (optimized with bulk caching) |
| 339 |
* |
| 340 |
* @param int $user_id User ID (0 for global) |
| 341 |
* @return array All settings |
| 342 |
*/ |
| 343 |
public function get_all(int $user_id = 0): array { |
| 344 |
// Check bulk cache first |
| 345 |
$bulk_cache_key = $user_id > 0 ? "bulk_user_{$user_id}" : 'bulk_global'; |
| 346 |
|
| 347 |
$cached_settings = wp_cache_get($bulk_cache_key, 'thinkrank_settings'); |
| 348 |
if ($cached_settings !== false) { |
| 349 |
return $cached_settings; |
| 350 |
} |
| 351 |
|
| 352 |
$settings = []; |
| 353 |
|
| 354 |
foreach (array_keys($this->defaults) as $key) { |
| 355 |
$settings[$key] = $this->get($key, null, $user_id); |
| 356 |
} |
| 357 |
|
| 358 |
// Cache all settings for 5 minutes |
| 359 |
wp_cache_set($bulk_cache_key, $settings, 'thinkrank_settings', 300); |
| 360 |
|
| 361 |
return $settings; |
| 362 |
} |
| 363 |
|
| 364 |
/** |
| 365 |
* Reset settings to defaults |
| 366 |
* |
| 367 |
* @param int $user_id User ID (0 for global) |
| 368 |
* @return bool Success status |
| 369 |
*/ |
| 370 |
public function reset(int $user_id = 0): bool { |
| 371 |
$success = true; |
| 372 |
|
| 373 |
foreach (array_keys($this->defaults) as $key) { |
| 374 |
if (!$this->delete($key, $user_id)) { |
| 375 |
$success = false; |
| 376 |
} |
| 377 |
} |
| 378 |
|
| 379 |
// Clear cache |
| 380 |
$this->cache = []; |
| 381 |
|
| 382 |
return $success; |
| 383 |
} |
| 384 |
|
| 385 |
/** |
| 386 |
* Sanitize settings |
| 387 |
* |
| 388 |
* @param array $settings Settings array |
| 389 |
* @return array Sanitized settings |
| 390 |
*/ |
| 391 |
public function sanitize_settings(array $settings): array { |
| 392 |
$sanitized = []; |
| 393 |
|
| 394 |
foreach ($settings as $key => $value) { |
| 395 |
$sanitized[$key] = $this->sanitize_setting($key, $value); |
| 396 |
} |
| 397 |
|
| 398 |
return $sanitized; |
| 399 |
} |
| 400 |
|
| 401 |
/** |
| 402 |
* Sanitize individual setting |
| 403 |
* |
| 404 |
* @param string $key Setting key |
| 405 |
* @param mixed $value Setting value |
| 406 |
* @return mixed Sanitized value |
| 407 |
*/ |
| 408 |
private function sanitize_setting(string $key, $value) { |
| 409 |
switch ($key) { |
| 410 |
case 'openai_api_key': |
| 411 |
case 'claude_api_key': |
| 412 |
case 'gemini_api_key': |
| 413 |
return sanitize_text_field($value); |
| 414 |
|
| 415 |
case 'ai_provider': |
| 416 |
case 'openai_model': |
| 417 |
case 'claude_model': |
| 418 |
case 'gemini_model': |
| 419 |
return sanitize_key($value); |
| 420 |
|
| 421 |
case 'max_tokens': |
| 422 |
case 'cache_duration': |
| 423 |
case 'max_requests_per_minute': |
| 424 |
case 'seo_score_threshold': |
| 425 |
case 'api_timeout': |
| 426 |
case 'retry_attempts': |
| 427 |
case 'data_retention_days': |
| 428 |
case 'monitoring_frequency': |
| 429 |
return absint($value); |
| 430 |
|
| 431 |
case 'temperature': |
| 432 |
return (float) $value; |
| 433 |
|
| 434 |
case 'dashboard_widgets': |
| 435 |
case 'seo_analytics_alert_thresholds': |
| 436 |
return is_array($value) ? array_map('sanitize_key', $value) : []; |
| 437 |
|
| 438 |
case 'google_analytics_property_id': |
| 439 |
case 'seo_analytics_google_analytics_property_id': |
| 440 |
case 'seo_analytics_report_schedule': |
| 441 |
return sanitize_text_field($value); |
| 442 |
|
| 443 |
default: |
| 444 |
if (is_bool($value)) { |
| 445 |
return (bool) $value; |
| 446 |
} elseif (is_string($value)) { |
| 447 |
return sanitize_text_field($value); |
| 448 |
} elseif (is_array($value)) { |
| 449 |
return array_map('sanitize_text_field', $value); |
| 450 |
} |
| 451 |
return $value; |
| 452 |
} |
| 453 |
} |
| 454 |
|
| 455 |
/** |
| 456 |
* Encryption version for tracking |
| 457 |
*/ |
| 458 |
private const ENCRYPTION_VERSION = 2; |
| 459 |
|
| 460 |
/** |
| 461 |
* Maybe encrypt value using WordPress native encryption |
| 462 |
* |
| 463 |
* @param string $key Setting key |
| 464 |
* @param mixed $value Setting value |
| 465 |
* @return mixed Encrypted or original value |
| 466 |
*/ |
| 467 |
private function maybe_encrypt(string $key, $value) { |
| 468 |
// Critical fix: disable custom encryption; store raw value without transformation |
| 469 |
return $value; |
| 470 |
} |
| 471 |
|
| 472 |
/** |
| 473 |
* Maybe decrypt value using WordPress native encryption |
| 474 |
* |
| 475 |
* @param string $key Setting key |
| 476 |
* @param mixed $value Setting value |
| 477 |
* @return mixed Decrypted or original value |
| 478 |
*/ |
| 479 |
private function maybe_decrypt(string $key, $value) { |
| 480 |
if (!in_array($key, $this->encrypted_keys, true) || empty($value)) { |
| 481 |
return $value; |
| 482 |
} |
| 483 |
|
| 484 |
// Backward compatibility: if value looks like our old encrypted payload, try to decrypt |
| 485 |
$data = base64_decode((string) $value, true); |
| 486 |
if ($data !== false && strlen($data) >= 33) { |
| 487 |
$version = unpack('C', substr($data, 0, 1))[1] ?? null; |
| 488 |
if ($version === self::ENCRYPTION_VERSION) { |
| 489 |
$decrypted = $this->decrypt_value((string) $value); |
| 490 |
// If decryption worked, return it; otherwise fall through and return original |
| 491 |
if ($decrypted !== '') { |
| 492 |
return $decrypted; |
| 493 |
} |
| 494 |
} |
| 495 |
} |
| 496 |
|
| 497 |
// Treat as already plain |
| 498 |
return $value; |
| 499 |
} |
| 500 |
|
| 501 |
/** |
| 502 |
* Encrypt value using WordPress native methods |
| 503 |
* |
| 504 |
* @param string $value Value to encrypt |
| 505 |
* @return string Encrypted value (base64 encoded) or empty string on failure |
| 506 |
* @throws \Exception When encryption process fails |
| 507 |
*/ |
| 508 |
private function encrypt_value(string $value): string { |
| 509 |
try { |
| 510 |
// Generate unique salt for this encryption |
| 511 |
$salt = wp_generate_password(32, false); |
| 512 |
|
| 513 |
// Create encryption key using WordPress salts |
| 514 |
$auth_salt = wp_salt('auth'); |
| 515 |
$secure_salt = wp_salt('secure_auth'); |
| 516 |
$key = wp_hash($salt . $auth_salt . $secure_salt); |
| 517 |
|
| 518 |
// XOR encryption |
| 519 |
$encrypted = $this->xor_encrypt($value, $key); |
| 520 |
|
| 521 |
// Version prefix + salt + encrypted data |
| 522 |
$version = pack('C', self::ENCRYPTION_VERSION); |
| 523 |
return base64_encode($version . $salt . $encrypted); |
| 524 |
} catch (\Exception $e) { |
| 525 |
// Silent failure on encryption error |
| 526 |
return ''; // Return empty on encryption failure |
| 527 |
} |
| 528 |
} |
| 529 |
|
| 530 |
/** |
| 531 |
* Decrypt value using WordPress native methods |
| 532 |
* |
| 533 |
* @param string $encrypted_value Encrypted value to decrypt |
| 534 |
* @return string Decrypted value or empty string on failure |
| 535 |
* @throws \Exception When decryption process fails |
| 536 |
*/ |
| 537 |
private function decrypt_value(string $encrypted_value): string { |
| 538 |
try { |
| 539 |
$data = base64_decode($encrypted_value, true); |
| 540 |
if (false === $data || strlen($data) < 33) { |
| 541 |
return ''; |
| 542 |
} |
| 543 |
|
| 544 |
// Extract version, salt, and encrypted data |
| 545 |
$version = unpack('C', substr($data, 0, 1))[1]; |
| 546 |
$salt = substr($data, 1, 32); |
| 547 |
$encrypted = substr($data, 33); |
| 548 |
|
| 549 |
// Verify version |
| 550 |
if ($version !== self::ENCRYPTION_VERSION) { |
| 551 |
return ''; |
| 552 |
} |
| 553 |
|
| 554 |
// Recreate encryption key |
| 555 |
$auth_salt = wp_salt('auth'); |
| 556 |
$secure_salt = wp_salt('secure_auth'); |
| 557 |
$key = wp_hash($salt . $auth_salt . $secure_salt); |
| 558 |
|
| 559 |
// Decrypt using XOR |
| 560 |
return $this->xor_decrypt($encrypted, $key); |
| 561 |
} catch (\Exception $e) { |
| 562 |
// Silent failure on decryption error |
| 563 |
return ''; |
| 564 |
} |
| 565 |
} |
| 566 |
|
| 567 |
/** |
| 568 |
* XOR encryption helper |
| 569 |
* |
| 570 |
* @param string $data Data to encrypt |
| 571 |
* @param string $key Encryption key |
| 572 |
* @return string Encrypted data |
| 573 |
*/ |
| 574 |
private function xor_encrypt(string $data, string $key): string { |
| 575 |
$result = ''; |
| 576 |
$key_length = strlen($key); |
| 577 |
$data_length = strlen($data); |
| 578 |
|
| 579 |
for ($i = 0; $i < $data_length; $i++) { |
| 580 |
$result .= chr(ord($data[$i]) ^ ord($key[$i % $key_length])); |
| 581 |
} |
| 582 |
|
| 583 |
return $result; |
| 584 |
} |
| 585 |
|
| 586 |
/** |
| 587 |
* XOR decryption helper (XOR is symmetric) |
| 588 |
* |
| 589 |
* @param string $encrypted Encrypted data |
| 590 |
* @param string $key Encryption key |
| 591 |
* @return string Decrypted data |
| 592 |
*/ |
| 593 |
private function xor_decrypt(string $encrypted, string $key): string { |
| 594 |
// XOR is symmetric, so decryption is the same as encryption |
| 595 |
return $this->xor_encrypt($encrypted, $key); |
| 596 |
} |
| 597 |
} |
| 598 |
|
