| 1 |
<?php |
| 2 |
/** |
| 3 |
* Word document handler and processor for MXChat |
| 4 |
* Can be directly bundled in WordPress plugins |
| 5 |
*/ |
| 6 |
class MXChat_Word_Handler { |
| 7 |
private $temp_dir; |
| 8 |
private $options; |
| 9 |
|
| 10 |
public function __construct($options) { |
| 11 |
$this->options = $options; |
| 12 |
$this->temp_dir = wp_upload_dir()['path']; |
| 13 |
} |
| 14 |
|
| 15 |
/** |
| 16 |
* Handle Word document upload and processing |
| 17 |
*/ |
| 18 |
public function mxchat_handle_word_upload() { |
| 19 |
// Match the PDF handler's nonce verification: the widget sends the chat-send |
| 20 |
// nonce (action 'mxchat_chat_send'), which the old check_ajax_referer('mxchat_chat_nonce') |
| 21 |
// rejected with -1. mxchat_verify_chat_send_nonce accepts both chat-send and chat nonces. |
| 22 |
if (!isset($_POST['nonce']) || !MxChat_Integrator::mxchat_verify_chat_send_nonce(wp_unslash((string) $_POST['nonce']))) { |
| 23 |
wp_send_json_error(array('message' => esc_html__('Invalid nonce.', 'mxchat')), 403); |
| 24 |
} |
| 25 |
|
| 26 |
if (!isset($_FILES['word_file']) || !isset($_POST['session_id'])) { |
| 27 |
wp_send_json_error(esc_html__('Missing required parameters.', 'mxchat')); |
| 28 |
return; |
| 29 |
} |
| 30 |
|
| 31 |
// SECURITY FIX: Check if Word uploads are enabled in settings |
| 32 |
$options = get_option('mxchat_options', array()); |
| 33 |
$show_word_button = isset($options['show_word_upload_button']) ? $options['show_word_upload_button'] : 'on'; |
| 34 |
|
| 35 |
if ($show_word_button !== 'on') { |
| 36 |
wp_send_json_error(esc_html__('Word document uploads are currently disabled.', 'mxchat')); |
| 37 |
return; |
| 38 |
} |
| 39 |
|
| 40 |
$file = $_FILES['word_file']; |
| 41 |
$session_id = MxChat_Utils::sanitize_session_id(wp_unslash($_POST['session_id'])); |
| 42 |
$original_filename = sanitize_text_field($file['name']); |
| 43 |
|
| 44 |
// Update session owner if it changed (e.g. IP changed due to network switch) |
| 45 |
$current_user_identifier = MxChat_User::mxchat_get_user_identifier(); |
| 46 |
$session_owner = MxChat_Session_Store::get($session_id, 'owner'); |
| 47 |
|
| 48 |
if (!$session_owner || $session_owner !== $current_user_identifier) { |
| 49 |
MxChat_Session_Store::set($session_id, 'owner', $current_user_identifier); |
| 50 |
} |
| 51 |
|
| 52 |
// Check file type |
| 53 |
$allowed_types = array( |
| 54 |
'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document' |
| 55 |
); |
| 56 |
$file_type = wp_check_filetype($file['name'], $allowed_types); |
| 57 |
|
| 58 |
if (!$file_type['type']) { |
| 59 |
wp_send_json_error(esc_html__('Invalid file type. Only .docx files are allowed.', 'mxchat')); |
| 60 |
return; |
| 61 |
} |
| 62 |
|
| 63 |
// SECURITY FIX: Generate random filename without exposing session_id |
| 64 |
$random_string = wp_generate_password(20, false, false); // 20 char alphanumeric string |
| 65 |
$word_filename = 'mxchat_word_' . $random_string . '_' . time() . '.docx'; |
| 66 |
$word_path = $this->temp_dir . '/' . $word_filename; |
| 67 |
|
| 68 |
if (!move_uploaded_file($file['tmp_name'], $word_path)) { |
| 69 |
wp_send_json_error(esc_html__('Failed to upload file.', 'mxchat')); |
| 70 |
return; |
| 71 |
} |
| 72 |
|
| 73 |
$this->mxchat_clear_word_transients($session_id); |
| 74 |
|
| 75 |
// Process the document |
| 76 |
$embeddings = $this->mxchat_process_word_document($word_path); |
| 77 |
|
| 78 |
if ($embeddings === false || empty($embeddings)) { |
| 79 |
unlink($word_path); |
| 80 |
$error_message = $this->options['word_intent_error_text'] ?? |
| 81 |
esc_html__('The uploaded document appears to be empty or contains unsupported content.', 'mxchat'); |
| 82 |
wp_send_json_error($error_message); |
| 83 |
return; |
| 84 |
} |
| 85 |
|
| 86 |
// Store the mapping between session and the random filename |
| 87 |
set_transient('mxchat_word_url_' . $session_id, $word_path, HOUR_IN_SECONDS); |
| 88 |
set_transient('mxchat_word_filename_' . $session_id, $original_filename, HOUR_IN_SECONDS); |
| 89 |
set_transient('mxchat_word_embeddings_' . $session_id, $embeddings, HOUR_IN_SECONDS); |
| 90 |
set_transient('mxchat_include_word_in_context_' . $session_id, true, HOUR_IN_SECONDS); |
| 91 |
|
| 92 |
$success_message = $this->options['pdf_intent_success_text'] ?? |
| 93 |
__("I've processed the document. What questions do you have about it?", 'mxchat'); |
| 94 |
|
| 95 |
wp_send_json_success([ |
| 96 |
'message' => $success_message, |
| 97 |
'filename' => $original_filename |
| 98 |
]); |
| 99 |
} |
| 100 |
|
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/** |
| 102 |
* Extract plain text from a .docx file. THE one .docx parser — the |
| 103 |
* visitor-facing toolbar upload (via mxchat_process_word_document) and the |
| 104 |
* admin knowledge importer (plan 0485e5) both call this; do not fork a |
| 105 |
* second copy. Returns the cleaned text, or false on unreadable/empty |
| 106 |
* files (not a Zip, no word/document.xml, no text content). |
| 107 |
*/ |
| 108 |
public static function extract_docx_text($file_path) { |
| 109 |
try { |
| 110 |
$zip = new ZipArchive(); |
| 111 |
if ($zip->open($file_path) !== true) { |
| 112 |
return false; |
| 113 |
} |
| 114 |
$content = $zip->getFromName('word/document.xml'); |
| 115 |
$zip->close(); |
| 116 |
if ($content === false) { |
| 117 |
return false; |
| 118 |
} |
| 119 |
$text = self::clean_word_xml($content); |
| 120 |
return $text === '' ? false : $text; |
| 121 |
} catch (Exception $e) { |
| 122 |
return false; |
| 123 |
} |
| 124 |
} |
| 125 |
|
| 126 |
/** |
| 127 |
* Process Word document and generate embeddings |
| 128 |
*/ |
| 129 |
private function mxchat_process_word_document($file_path) { |
| 130 |
// Get the maximum number of pages allowed from admin settings |
| 131 |
$max_pages = isset($this->options['pdf_max_pages']) ? intval($this->options['pdf_max_pages']) : 69; // Use same setting as PDF |
| 132 |
|
| 133 |
try { |
| 134 |
$text = self::extract_docx_text($file_path); |
| 135 |
if ($text === false) { |
| 136 |
return false; |
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} |
| 138 |
|
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// Count pages (roughly estimate based on paragraphs) |
| 140 |
$paragraphs = explode("\n\n", $text); |
| 141 |
$estimated_pages = ceil(count($paragraphs) / 3); // Assume ~3 paragraphs per page |
| 142 |
|
| 143 |
if ($estimated_pages > $max_pages) { |
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return esc_html__('too_many_pages', 'mxchat'); |
| 145 |
} |
| 146 |
|
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// Split into chunks and continue processing... |
| 148 |
$chunks = $this->mxchat_split_word_into_chunks($text, 1000); |
| 149 |
|
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$embeddings = []; |
| 151 |
foreach ($chunks as $chunk_number => $chunk) { |
| 152 |
if (empty(trim($chunk))) { |
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continue; |
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} |
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|
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$embedding = $this->mxchat_generate_embedding_word( |
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esc_html__('Chunk ', 'mxchat') . ($chunk_number + 1) . ': ' . $chunk, |
| 158 |
$this->options['api_key'] |
| 159 |
); |
| 160 |
|
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if ($embedding) { |
| 162 |
$embeddings[] = [ |
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'chunk_number' => $chunk_number + 1, |
| 164 |
'embedding' => $embedding, |
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'text' => $chunk, |
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]; |
| 167 |
} |
| 168 |
} |
| 169 |
|
| 170 |
return $embeddings; |
| 171 |
|
| 172 |
} catch (Exception $e) { |
| 173 |
return false; |
| 174 |
} |
| 175 |
} |
| 176 |
/** |
| 177 |
* Clean Word XML content (word/document.xml) to plain text. |
| 178 |
* Static so both callers of extract_docx_text share one implementation. |
| 179 |
*/ |
| 180 |
public static function clean_word_xml($content) { |
| 181 |
// Remove XML namespaces |
| 182 |
$content = preg_replace('/xmlns[^=]*="[^"]*"/i', '', $content); |
| 183 |
|
| 184 |
// Convert Word XML elements to text |
| 185 |
$content = str_replace('</w:p>', "\n", $content); |
| 186 |
$content = str_replace('</w:tr>', "\n", $content); |
| 187 |
|
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// Strip remaining XML tags |
| 189 |
$content = strip_tags($content); |
| 190 |
|
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// Clean up whitespace |
| 192 |
$content = preg_replace('/\s+/', ' ', $content); |
| 193 |
$content = preg_replace('/\n\s*\n/', "\n\n", $content); |
| 194 |
|
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return trim($content); |
| 196 |
} |
| 197 |
|
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/** |
| 199 |
* Split text into manageable chunks |
| 200 |
*/ |
| 201 |
private function mxchat_split_word_into_chunks($text, $chunk_size) { |
| 202 |
$chunks = []; |
| 203 |
$paragraphs = explode("\n\n", $text); |
| 204 |
|
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$current_chunk = ''; |
| 206 |
foreach ($paragraphs as $paragraph) { |
| 207 |
if (strlen($current_chunk) + strlen($paragraph) > $chunk_size) { |
| 208 |
if (!empty($current_chunk)) { |
| 209 |
$chunks[] = trim($current_chunk); |
| 210 |
} |
| 211 |
$current_chunk = $paragraph; |
| 212 |
} else { |
| 213 |
$current_chunk .= (!empty($current_chunk) ? "\n\n" : '') . $paragraph; |
| 214 |
} |
| 215 |
} |
| 216 |
|
| 217 |
if (!empty($current_chunk)) { |
| 218 |
$chunks[] = trim($current_chunk); |
| 219 |
} |
| 220 |
|
| 221 |
return $chunks; |
| 222 |
} |
| 223 |
|
| 224 |
/** |
| 225 |
* Remove Word document and clean up transients |
| 226 |
*/ |
| 227 |
public function mxchat_handle_word_remove() { |
| 228 |
check_ajax_referer('mxchat_chat_nonce', 'nonce'); |
| 229 |
|
| 230 |
if (empty($_POST['session_id'])) { |
| 231 |
wp_send_json_error(esc_html__('Session ID missing.', 'mxchat')); |
| 232 |
return; |
| 233 |
} |
| 234 |
|
| 235 |
$session_id = MxChat_Utils::sanitize_session_id(wp_unslash($_POST['session_id'])); |
| 236 |
if ($session_id === '') { |
| 237 |
wp_send_json_error(esc_html__('Session ID missing.', 'mxchat')); |
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return; |
| 239 |
} |
| 240 |
|
| 241 |
// Session-ownership bookkeeping — same rule as handle_pdf_remove() and the |
| 242 |
// history endpoint (plan-mxchat-20260731-d42bec). Possession of the session |
| 243 |
// id is the credential, so this records/refreshes the owner rather than |
| 244 |
// refusing a mismatch; see the fuller note in handle_pdf_remove(). |
| 245 |
$current_user_identifier = MxChat_User::mxchat_get_user_identifier(); |
| 246 |
$session_owner = MxChat_Session_Store::get($session_id, 'owner'); |
| 247 |
if (!$session_owner || $session_owner !== $current_user_identifier) { |
| 248 |
MxChat_Session_Store::set($session_id, 'owner', $current_user_identifier); |
| 249 |
} |
| 250 |
|
| 251 |
$word_path = get_transient('mxchat_word_url_' . $session_id); |
| 252 |
|
| 253 |
if ($word_path && file_exists($word_path)) { |
| 254 |
unlink($word_path); |
| 255 |
} |
| 256 |
|
| 257 |
$this->mxchat_clear_word_transients($session_id); |
| 258 |
|
| 259 |
wp_send_json_success([ |
| 260 |
'message' => esc_html__('Document removed successfully.', 'mxchat') |
| 261 |
]); |
| 262 |
} |
| 263 |
|
| 264 |
/** |
| 265 |
* Clear all Word-related transients |
| 266 |
*/ |
| 267 |
private function mxchat_clear_word_transients($session_id) { |
| 268 |
delete_transient('mxchat_word_url_' . $session_id); |
| 269 |
delete_transient('mxchat_word_filename_' . $session_id); |
| 270 |
delete_transient('mxchat_word_embeddings_' . $session_id); |
| 271 |
delete_transient('mxchat_include_word_in_context_' . $session_id); |
| 272 |
} |
| 273 |
|
| 274 |
/** |
| 275 |
* Find relevant chunks from the Word document |
| 276 |
*/ |
| 277 |
public function mxchat_find_relevant_word_chunks($query_embedding, $embeddings) { |
| 278 |
$most_relevant = null; |
| 279 |
$highest_similarity = -INF; |
| 280 |
|
| 281 |
foreach ($embeddings as $chunk_data) { |
| 282 |
$similarity = $this->mxchat_calculate_cosine_similarity_word($query_embedding, $chunk_data['embedding']); |
| 283 |
|
| 284 |
if ($similarity > $highest_similarity) { |
| 285 |
$highest_similarity = $similarity; |
| 286 |
$most_relevant = $chunk_data['chunk_number']; |
| 287 |
} |
| 288 |
} |
| 289 |
|
| 290 |
if (!is_null($most_relevant)) { |
| 291 |
$chunk_numbers = range( |
| 292 |
max(1, $most_relevant - 1), |
| 293 |
min(count($embeddings), $most_relevant + 1) |
| 294 |
); |
| 295 |
return array_filter($embeddings, function ($chunk) use ($chunk_numbers) { |
| 296 |
return in_array($chunk['chunk_number'], $chunk_numbers); |
| 297 |
}); |
| 298 |
} |
| 299 |
|
| 300 |
return []; |
| 301 |
} |
| 302 |
|
| 303 |
/** |
| 304 |
* Handle Word document discussion similar to PDF discussion |
| 305 |
*/ |
| 306 |
public function mxchat_handle_word_discussion($message, $user_id, $session_id) { |
| 307 |
// Get stored embeddings for the session |
| 308 |
$embeddings = get_transient('mxchat_word_embeddings_' . $session_id); |
| 309 |
$word_path = get_transient('mxchat_word_url_' . $session_id); |
| 310 |
|
| 311 |
if (!$embeddings || !$word_path) { |
| 312 |
$trigger_text = $this->options['word_intent_trigger_text'] ?? |
| 313 |
__("Please upload a Word document (.docx) that you'd like to discuss.", 'mxchat'); |
| 314 |
set_transient('mxchat_waiting_for_word_' . $session_id, true, HOUR_IN_SECONDS); |
| 315 |
$this->fallbackResponse['text'] = $trigger_text; |
| 316 |
return; |
| 317 |
} |
| 318 |
|
| 319 |
// Set context flag for including Word content in conversation |
| 320 |
set_transient('mxchat_include_word_in_context_' . $session_id, true, HOUR_IN_SECONDS); |
| 321 |
$this->fallbackResponse['text'] = ''; // Proceed without additional message |
| 322 |
} |
| 323 |
|
| 324 |
|
| 325 |
private function mxchat_generate_embedding_word($text, $api_key) { |
| 326 |
$endpoint = 'https://api.openai.com/v1/embeddings'; |
| 327 |
|
| 328 |
$body = wp_json_encode([ |
| 329 |
'input' => $text, |
| 330 |
'model' => 'text-embedding-ada-002' |
| 331 |
]); |
| 332 |
|
| 333 |
$args = [ |
| 334 |
'body' => $body, |
| 335 |
'headers' => [ |
| 336 |
'Content-Type' => 'application/json', |
| 337 |
'Authorization' => 'Bearer ' . $api_key, |
| 338 |
], |
| 339 |
'timeout' => 60, |
| 340 |
'redirection' => 5, |
| 341 |
'blocking' => true, |
| 342 |
'httpversion' => '1.0', |
| 343 |
'sslverify' => true, |
| 344 |
]; |
| 345 |
|
| 346 |
$response = wp_remote_post($endpoint, $args); |
| 347 |
|
| 348 |
if (is_wp_error($response)) { |
| 349 |
return null; |
| 350 |
} |
| 351 |
|
| 352 |
$response_body = json_decode(wp_remote_retrieve_body($response), true); |
| 353 |
|
| 354 |
if (isset($response_body['data'][0]['embedding']) && is_array($response_body['data'][0]['embedding'])) { |
| 355 |
return $response_body['data'][0]['embedding']; |
| 356 |
} else { |
| 357 |
return null; |
| 358 |
} |
| 359 |
} |
| 360 |
|
| 361 |
|
| 362 |
private function mxchat_calculate_cosine_similarity_word($vectorA, $vectorB) { |
| 363 |
if (!is_array($vectorA) || !is_array($vectorB) || empty($vectorA) || empty($vectorB)) { |
| 364 |
return 0; |
| 365 |
} |
| 366 |
|
| 367 |
$dotProduct = array_sum(array_map(function ($a, $b) { |
| 368 |
return $a * $b; |
| 369 |
}, $vectorA, $vectorB)); |
| 370 |
$normA = sqrt(array_sum(array_map(function ($a) { |
| 371 |
return $a * $a; |
| 372 |
}, $vectorA))); |
| 373 |
$normB = sqrt(array_sum(array_map(function ($b) { |
| 374 |
return $b * $b; |
| 375 |
}, $vectorB))); |
| 376 |
|
| 377 |
if ($normA == 0 || $normB == 0) { |
| 378 |
return 0; |
| 379 |
} |
| 380 |
|
| 381 |
return $dotProduct / ($normA * $normB); |
| 382 |
} |
| 383 |
|
| 384 |
/** |
| 385 |
* Check the status of a Word document for the current session |
| 386 |
*/ |
| 387 |
public function mxchat_check_word_status() { |
| 388 |
check_ajax_referer('mxchat_chat_nonce', 'nonce'); |
| 389 |
|
| 390 |
if (empty($_POST['session_id'])) { |
| 391 |
wp_send_json_error(esc_html__('Session ID missing.', 'mxchat')); |
| 392 |
return; |
| 393 |
} |
| 394 |
|
| 395 |
$session_id = MxChat_Utils::sanitize_session_id(wp_unslash($_POST['session_id'])); |
| 396 |
$word_path = get_transient('mxchat_word_url_' . $session_id); |
| 397 |
$filename = get_transient('mxchat_word_filename_' . $session_id); |
| 398 |
|
| 399 |
if ($word_path && file_exists($word_path) && $filename) { |
| 400 |
wp_send_json_success([ |
| 401 |
'has_word' => true, |
| 402 |
'filename' => $filename |
| 403 |
]); |
| 404 |
} else { |
| 405 |
wp_send_json_success([ |
| 406 |
'has_word' => false |
| 407 |
]); |
| 408 |
} |
| 409 |
} |
| 410 |
|
| 411 |
|
| 412 |
} |
