├── readme.md ├── clear-caches.js ├── clear-caches.php └── license /readme.md: -------------------------------------------------------------------------------- 1 | # Clear Caches 2 | 3 | Purge all of the WordPress caches 4 | 5 | ## Changelog 6 | 7 | ### 3.0.0 8 | - major refactoring and security hardening 9 | - Multisite network `sitemeta` transients now cleared (for super admins only) 10 | - added total deleted row count to cleared transients success message 11 | - added dynamic nonce helper with static caching for AJAX 12 | - replaced `sanitize_text_field()` with `sanitize_key()` for AJAX request 13 | - improved capability fallback logic via `get_clear_caches_capability()` helper 14 | - restricted Nginx cache deletion to known safe paths (supports SlickStack, EasyEngine, WordOps, and more) 15 | - updated Nginx deletion logic with stricter realpath + validation 16 | - improved JS modal UX (ARIA tags, better namespaces, more WordPress-native CSS styling) 17 | - improved JS modal security (gracefully degrades if `clearCachesData` is missing, escapes messages with `.text()` now to prevent HTML injection) 18 | - added `wp_die()` after all `wp_send_json_*()` responses 19 | - added `Requires PHP` plugin header 20 | - added `Tested up to` plugin header 21 | - added `Update URI` plugin header 22 | - added `Text Domain` plugin header 23 | 24 | ### 2.0.2 25 | - fixed `gu_override_dot_org` snippet 26 | 27 | ### 2.0.1 28 | - fixed enqueue of jQuery both frontend and backend 29 | 30 | ### 2.0.0 31 | - completely refactored to WordPress coding standards 32 | - now supports multiple object cache softwares (Memcached, Memcache, Redis, Predis, Relay Cache, and default WordPress object cache) 33 | - now supports clearing (deleting) database transients 34 | - better messaging in case of success or failure in each cache module 35 | - better verification of actual flushing in certain modules 36 | - new defined constant `CLEAR_CACHES_MIN_CAPABILITY` 37 | - new defined constant `CLEAR_CACHES_TRANSIENTS` 38 | - supports PHP 7.0 to PHP 8.3 39 | - supports Multisite 40 | 41 | ### 1.2.3 42 | * fixed fatal error (missing bracket) 43 | 44 | ### 1.2.2 45 | * fixed undefined variable error (new default $modified = false) 46 | 47 | ### 1.2.1 48 | * tweaked spelling of various buttons 49 | * tested with WP 5.1 50 | 51 | ### 1.2.0 52 | * PBP v1.2.0 53 | * AUTOMATIC_UPDATE_PLUGINS 54 | 55 | ### 1.1.1 56 | * simplied settings page to be single page (no tabs) 57 | * new button `Save Nginx Path` 58 | * popup modal outputs the Nginx path when caches are cleared 59 | 60 | ### 1.1.0 61 | * changed plugin name from Purge Them All to Clear Caches 62 | * PBP v1.1.1 63 | * defined constant `CLEAR_CACHES` 64 | * defined constant `CLEAR_CACHES_NGINX` 65 | * defined constant `CLEAR_CACHES_NGINX_PATH` 66 | * defined constant `CLEAR_CACHES_OBJECT` 67 | * defined constant `CLEAR_CACHES_OPCACHE` 68 | * removed all CloudFlare integration 69 | * (focus going forward will be on-server caches only) 70 | 71 | ### 1.0.0 72 | * initial release 73 | * uses PHP namespaces 74 | * object-oriented codebase 75 | -------------------------------------------------------------------------------- /clear-caches.js: -------------------------------------------------------------------------------- 1 | jQuery( document ).ready( $ => { 2 | // exit if ajax data is not available 3 | if ( typeof clearCachesData === 'undefined' ) return; 4 | 5 | // prevent multiple ajax requests 6 | let isProcessing = false; 7 | 8 | // send ajax request to clear cache 9 | const clearCache = ( type ) => { 10 | if ( isProcessing ) return; 11 | 12 | isProcessing = true; 13 | showModal( 'Please wait...' ); 14 | 15 | $.ajax( { 16 | url: clearCachesData.ajaxurl, 17 | type: 'POST', 18 | data: { 19 | action: 'clear_caches_action', 20 | cache_type: type, 21 | security: clearCachesData.nonce 22 | }, 23 | success: ( response ) => { 24 | const message = response?.data?.message || 'Unexpected server response.'; 25 | const status = response.success ? 'success' : 'error'; 26 | updateModal( message, status ); 27 | }, 28 | error: () => { 29 | updateModal( 'Request failed. Please try again.', 'error' ); 30 | }, 31 | complete: () => { 32 | isProcessing = false; 33 | setTimeout( () => { 34 | $( '#clear-caches-modal, #clear-caches-overlay' ).remove(); 35 | }, 2000 ); 36 | } 37 | } ); 38 | }; 39 | 40 | // attach click events 41 | $( '.clear-cache-php-opcache' ).on( 'click', ( e ) => handleClick( e, 'php_opcache' ) ); 42 | $( '.clear-cache-nginx' ).on( 'click', ( e ) => handleClick( e, 'nginx_cache' ) ); 43 | $( '.clear-cache-object' ).on( 'click', ( e ) => handleClick( e, 'object_cache' ) ); 44 | $( '.clear-cache-transients' ).on( 'click', ( e ) => handleClick( e, 'clear_transients' ) ); 45 | 46 | // trigger ajax on click 47 | const handleClick = ( e, cacheType ) => { 48 | e.preventDefault(); 49 | if ( ! isProcessing ) { 50 | clearCache( cacheType ); 51 | } 52 | }; 53 | 54 | // show modal overlay with message 55 | function showModal( message ) { 56 | if ( $( '#clear-caches-overlay' ).length === 0 ) { 57 | $( '
' ).css( { 58 | position: 'fixed', 59 | top: 0, 60 | left: 0, 61 | width: '100%', 62 | height: '100%', 63 | display: 'flex', 64 | justifyContent: 'center', 65 | alignItems: 'center', 66 | backgroundColor: 'rgba(0, 0, 0, 0.7)', 67 | zIndex: 99999 68 | } ).appendTo( 'body' ); 69 | } 70 | 71 | if ( $( '#clear-caches-modal' ).length === 0 ) { 72 | $( '
' ).css( { 73 | display: 'flex', 74 | justifyContent: 'center', 75 | alignItems: 'center', 76 | flexDirection: 'column', 77 | width: '320px', 78 | maxWidth: '90%', 79 | minHeight: '60px', 80 | overflowY: 'auto', 81 | padding: '16px 24px', 82 | backgroundColor: '#fff', 83 | color: '#23282d', 84 | fontSize: '13px', 85 | fontFamily: '-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif', 86 | textAlign: 'center', 87 | lineHeight: '1.5', 88 | borderRadius: '4px', 89 | boxShadow: '0 1px 3px rgba(0, 0, 0, 0.1)', 90 | zIndex: 100000 91 | } ).appendTo( '#clear-caches-overlay' ); 92 | } 93 | 94 | $( '#clear-caches-modal' ).text( message ); 95 | } 96 | 97 | // update modal content 98 | function updateModal( message, type ) { 99 | $( '#clear-caches-modal' ).text( message ); 100 | } 101 | } ); 102 | 103 | // Ref: ChatGPT 104 | -------------------------------------------------------------------------------- /clear-caches.php: -------------------------------------------------------------------------------- 1 | add_node( [ 78 | 'id' => 'clear_caches', 79 | 'parent' => 'top-secondary', 80 | 'title' => 'Clear Caches', 81 | 'meta' => [ 'class' => 'clear-caches-admin-bar' ] 82 | ] ); 83 | 84 | // add submenu for php opcache 85 | if ( CLEAR_CACHES_OPCACHE ) { 86 | $wp_admin_bar->add_node( [ 87 | 'id' => 'clear_php_opcache', 88 | 'parent' => 'clear_caches', 89 | 'title' => 'Clear PHP OPcache', 90 | 'href' => 'javascript:void(0);', 91 | 'meta' => [ 'class' => 'clear-cache-php-opcache' ] 92 | ] ); 93 | } 94 | 95 | // add submenu for nginx cache 96 | if ( CLEAR_CACHES_NGINX ) { 97 | $wp_admin_bar->add_node( [ 98 | 'id' => 'clear_nginx_cache', 99 | 'parent' => 'clear_caches', 100 | 'title' => 'Clear Nginx Cache', 101 | 'href' => 'javascript:void(0);', 102 | 'meta' => [ 'class' => 'clear-cache-nginx' ] 103 | ] ); 104 | } 105 | 106 | // add submenu for object cache 107 | if ( CLEAR_CACHES_OBJECT ) { 108 | $wp_admin_bar->add_node( [ 109 | 'id' => 'clear_object_cache', 110 | 'parent' => 'clear_caches', 111 | 'title' => 'Clear Object Cache', 112 | 'href' => 'javascript:void(0);', 113 | 'meta' => [ 'class' => 'clear-cache-object' ] 114 | ] ); 115 | } 116 | 117 | // add submenu for transients 118 | if ( CLEAR_CACHES_TRANSIENTS ) { 119 | $wp_admin_bar->add_node( [ 120 | 'id' => 'clear_transients', 121 | 'parent' => 'clear_caches', 122 | 'title' => 'Clear Transients Cache', 123 | 'href' => 'javascript:void(0);', 124 | 'meta' => [ 'class' => 'clear-cache-transients' ] 125 | ] ); 126 | } 127 | }, 100 ); 128 | 129 | // enqueue javascript for both frontend and backend 130 | function enqueue_clear_caches_scripts() { 131 | if ( is_admin_bar_showing() ) { 132 | wp_enqueue_script( 133 | 'clear-caches-script', 134 | plugin_dir_url( __FILE__ ) . 'clear-caches.js', 135 | [ 'jquery' ], 136 | filemtime( plugin_dir_path( __FILE__ ) . 'clear-caches.js' ), 137 | true 138 | ); 139 | 140 | wp_localize_script( 'clear-caches-script', 'clearCachesData', [ 141 | 'ajaxurl' => admin_url( 'admin-ajax.php' ), 142 | 'nonce' => clear_caches_get_nonce() 143 | ] ); 144 | } 145 | } 146 | add_action( 'wp_enqueue_scripts', 'enqueue_clear_caches_scripts' ); 147 | add_action( 'admin_enqueue_scripts', 'enqueue_clear_caches_scripts' ); 148 | 149 | // handle ajax requests 150 | add_action( 'wp_ajax_clear_caches_action', function() { 151 | $min_capability = get_clear_caches_capability(); 152 | 153 | // check user capability (edit_posts minimum) 154 | if ( ! current_user_can( 'edit_posts' ) || ( $min_capability !== 'edit_posts' && ! current_user_can( $min_capability ) ) ) { 155 | wp_send_json_error( [ 'message' => 'Permission denied.' ] ); 156 | wp_die(); 157 | } 158 | 159 | // verify nonce 160 | check_ajax_referer( 'clear_caches_nonce', 'security' ); 161 | 162 | $cache_type = sanitize_key( $_POST['cache_type'] ?? '' ); 163 | $valid_cache_types = [ 'php_opcache', 'nginx_cache', 'object_cache', 'clear_transients' ]; 164 | 165 | // validate requested cache type 166 | if ( ! in_array( $cache_type, $valid_cache_types, true ) ) { 167 | wp_send_json_error( [ 'message' => 'Invalid cache type specified.' ] ); 168 | wp_die(); 169 | } 170 | 171 | // call matching cache clear function 172 | if ( $cache_type === 'php_opcache' ) { 173 | clear_php_opcache(); 174 | return; 175 | } 176 | 177 | if ( $cache_type === 'nginx_cache' ) { 178 | clear_nginx_cache(); 179 | return; 180 | } 181 | 182 | if ( $cache_type === 'object_cache' ) { 183 | clear_object_cache(); 184 | return; 185 | } 186 | 187 | if ( $cache_type === 'clear_transients' ) { 188 | clear_all_transients(); 189 | return; 190 | } 191 | 192 | // fallback response (should not be reached) 193 | wp_send_json_error( [ 'message' => 'Unhandled cache type.' ] ); 194 | wp_die(); 195 | }); 196 | 197 | // clear php opcache 198 | function clear_php_opcache() { 199 | if ( function_exists( 'opcache_reset' ) ) { 200 | opcache_reset(); 201 | wp_send_json_success( [ 'message' => 'PHP OPcache cleared successfully.' ] ); 202 | wp_die(); 203 | } else { 204 | wp_send_json_error( [ 'message' => 'PHP OPcache is not available on this server.' ] ); 205 | wp_die(); 206 | } 207 | } 208 | 209 | // clear nginx cache 210 | function clear_nginx_cache() { 211 | $nginx_cache_path = realpath( CLEAR_CACHES_NGINX_PATH ); 212 | 213 | // allow only specific known nginx cache paths 214 | $allowed_paths = [ 215 | '/var/www/cache/nginx', 216 | '/var/cache/nginx', 217 | '/var/run/nginx-cache', 218 | '/var/nginx/cache', 219 | '/tmp/nginx-cache' 220 | ]; 221 | 222 | // abort if resolved path is not in the allowed list 223 | if ( ! $nginx_cache_path || ! in_array( $nginx_cache_path, $allowed_paths, true ) ) { 224 | wp_send_json_error( [ 'message' => 'Nginx cache path is not allowed.' ] ); 225 | wp_die(); 226 | } 227 | 228 | // check if nginx cache path is valid and writable 229 | if ( file_exists( $nginx_cache_path ) && is_dir( $nginx_cache_path ) && is_writable( $nginx_cache_path ) ) { 230 | // refresh filesystem metadata cache 231 | clearstatcache(); 232 | 233 | // recursively iterate all files and folders, child-first 234 | $files = new RecursiveIteratorIterator( 235 | new RecursiveDirectoryIterator( $nginx_cache_path, RecursiveDirectoryIterator::SKIP_DOTS ), 236 | RecursiveIteratorIterator::CHILD_FIRST 237 | ); 238 | 239 | $errors = []; 240 | 241 | // attempt to delete each file and folder 242 | foreach ( $files as $fileinfo ) { 243 | $path = $fileinfo->getRealPath(); 244 | if ( $fileinfo->isDir() ) { 245 | if ( ! @rmdir( $path ) ) { 246 | $errors[] = $path; 247 | } 248 | } else { 249 | if ( ! @unlink( $path ) ) { 250 | $errors[] = $path; 251 | } 252 | } 253 | } 254 | 255 | // send response based on errors 256 | if ( empty( $errors ) ) { 257 | wp_send_json_success( [ 'message' => 'Nginx cache cleared successfully.' ] ); 258 | wp_die(); 259 | } else { 260 | wp_send_json_error( [ 'message' => 'Failed to clear some Nginx cache files. Check permissions.' ] ); 261 | wp_die(); 262 | } 263 | } else { 264 | // path not valid or not writable 265 | wp_send_json_error( [ 'message' => 'Nginx cache path does not exist, is not a directory, or is not writable.' ] ); 266 | wp_die(); 267 | } 268 | } 269 | 270 | // clear object cache 271 | function clear_object_cache() { 272 | // handle memcached backend 273 | if ( class_exists( 'Memcached' ) ) { 274 | $memcached = new Memcached(); 275 | if ( $memcached->addServer( CLEAR_CACHES_MEMCACHED_HOST, CLEAR_CACHES_MEMCACHED_PORT ) ) { 276 | $memcached->flush(); 277 | $memcached->set( 'test_key', 'test_value', 10 ); 278 | if ( $memcached->get( 'test_key' ) === 'test_value' ) { 279 | wp_send_json_success( [ 'message' => 'Object cache (Memcached) cleared successfully.' ] ); 280 | wp_die(); 281 | } else { 282 | wp_send_json_error( [ 'message' => 'Memcached flush succeeded, but verification failed.' ] ); 283 | wp_die(); 284 | } 285 | } else { 286 | wp_send_json_error( [ 'message' => 'Could not connect to Memcached server.' ] ); 287 | wp_die(); 288 | } 289 | } 290 | 291 | // handle memcache backend 292 | elseif ( class_exists( 'Memcache' ) ) { 293 | $memcache = new Memcache(); 294 | if ( $memcache->addServer( CLEAR_CACHES_MEMCACHED_HOST, CLEAR_CACHES_MEMCACHED_PORT ) ) { 295 | $memcache->flush(); 296 | $memcache->set( 'test_key', 'test_value', 0, 10 ); 297 | if ( $memcache->get( 'test_key' ) === 'test_value' ) { 298 | wp_send_json_success( [ 'message' => 'Object cache (Memcache) cleared successfully.' ] ); 299 | wp_die(); 300 | } else { 301 | wp_send_json_error( [ 'message' => 'Memcache flush succeeded, but verification failed.' ] ); 302 | wp_die(); 303 | } 304 | } else { 305 | wp_send_json_error( [ 'message' => 'Could not connect to Memcache server.' ] ); 306 | wp_die(); 307 | } 308 | } 309 | 310 | // handle redis extension 311 | elseif ( class_exists( 'Redis' ) ) { 312 | $redis = new Redis(); 313 | try { 314 | if ( $redis->connect( CLEAR_CACHES_REDIS_HOST, CLEAR_CACHES_REDIS_PORT ) ) { 315 | $redis->flushAll(); 316 | $redis->set( 'test_key', 'test_value', 10 ); 317 | if ( $redis->get( 'test_key' ) === 'test_value' ) { 318 | wp_send_json_success( [ 'message' => 'Object cache (Redis) cleared successfully.' ] ); 319 | wp_die(); 320 | } else { 321 | wp_send_json_error( [ 'message' => 'Redis flush succeeded, but verification failed.' ] ); 322 | wp_die(); 323 | } 324 | } else { 325 | wp_send_json_error( [ 'message' => 'Could not connect to Redis server.' ] ); 326 | wp_die(); 327 | } 328 | } catch ( Exception $e ) { 329 | wp_send_json_error( [ 'message' => 'Redis error: ' . $e->getMessage() ] ); 330 | wp_die(); 331 | } 332 | } 333 | 334 | // handle predis client 335 | elseif ( class_exists( 'Predis\Client' ) ) { 336 | try { 337 | $predis = new Predis\Client(); 338 | $predis->flushall(); 339 | $predis->set( 'test_key', 'test_value' ); 340 | if ( $predis->get( 'test_key' ) === 'test_value' ) { 341 | wp_send_json_success( [ 'message' => 'Object cache (Predis) cleared successfully.' ] ); 342 | wp_die(); 343 | } else { 344 | wp_send_json_error( [ 'message' => 'Predis flush succeeded, but verification failed.' ] ); 345 | wp_die(); 346 | } 347 | } catch ( Exception $e ) { 348 | wp_send_json_error( [ 'message' => 'Predis error: ' . $e->getMessage() ] ); 349 | wp_die(); 350 | } 351 | } 352 | 353 | // handle relay backend 354 | elseif ( function_exists( 'relay_flush' ) ) { 355 | $flushed = relay_flush(); 356 | if ( $flushed ) { 357 | wp_send_json_success( [ 'message' => 'Object cache (Relay) cleared successfully.' ] ); 358 | wp_die(); 359 | } else { 360 | wp_send_json_error( [ 'message' => 'Relay flush failed. Check server configuration.' ] ); 361 | wp_die(); 362 | } 363 | } 364 | 365 | // fallback to wordpress object cache flush 366 | else { 367 | wp_cache_flush(); 368 | wp_send_json_success( [ 'message' => 'Object cache (WordPress) cleared. Verification not supported.' ] ); 369 | wp_die(); 370 | } 371 | } 372 | 373 | // clear all transients 374 | function clear_all_transients() { 375 | global $wpdb; 376 | 377 | // delete _transient_ keys for current site only 378 | $transients_deleted = $wpdb->query( 379 | $wpdb->prepare( 380 | "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s", 381 | $wpdb->esc_like( '_transient_' ) . '%' 382 | ) 383 | ); 384 | 385 | // delete _site_transient_ keys for current site only 386 | $site_transients_deleted = $wpdb->query( 387 | $wpdb->prepare( 388 | "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s", 389 | $wpdb->esc_like( '_site_transient_' ) . '%' 390 | ) 391 | ); 392 | 393 | // delete network-wide transients from sitemeta (super admin only) 394 | $sitemeta_deleted = true; 395 | if ( is_multisite() && is_super_admin() ) { 396 | $sitemeta_deleted = $wpdb->query( 397 | $wpdb->prepare( 398 | "DELETE FROM {$wpdb->sitemeta} WHERE meta_key LIKE %s", 399 | $wpdb->esc_like( '_site_transient_' ) . '%' 400 | ) 401 | ); 402 | } 403 | 404 | // return error if any query failed 405 | if ( $transients_deleted === false || $site_transients_deleted === false || ( is_multisite() && is_super_admin() && $sitemeta_deleted === false ) ) { 406 | wp_send_json_error( [ 'message' => 'Failed to clear transients. Check database permissions.' ] ); 407 | wp_die(); 408 | } 409 | 410 | // return success if nothing found 411 | if ( $transients_deleted === 0 && $site_transients_deleted === 0 && ( ! is_multisite() || ! is_super_admin() || $sitemeta_deleted === 0 ) ) { 412 | wp_send_json_success( [ 'message' => 'No transients found to delete.' ] ); 413 | wp_die(); 414 | } 415 | 416 | // calculate total rows deleted 417 | $total_deleted = (int) $transients_deleted + (int) $site_transients_deleted; 418 | if ( is_multisite() && is_super_admin() ) { 419 | $total_deleted += (int) $sitemeta_deleted; 420 | } 421 | 422 | // return success after deletions 423 | wp_send_json_success( [ 'message' => "Successfully cleared {$total_deleted} transient row" . ( $total_deleted === 1 ? '' : 's' ) . "." ] ); 424 | wp_die(); 425 | } 426 | 427 | // Ref: ChatGPT 428 | -------------------------------------------------------------------------------- /license: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | --------------------------------------------------------------------------------