advancedcontentfilter/advancedcontentfilter.php

   1 <?php
   2 /**
   3  * Name: Advanced content Filter
   4  * Description: Expression-based content filter
   5  * Version: 1.0
   6  * Author: Hypolite Petovan <https://friendica.mrpetovan.com/profile/hypolite>
   7  * Maintainer: Hypolite Petovan <https://friendica.mrpetovan.com/profile/hypolite>
   8  *
   9  * Copyright (c) 2018 Hypolite Petovan
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions are met:
  14  *    * Redistributions of source code must retain the above copyright notice,
  15  *     this list of conditions and the following disclaimer.
  16  *    * Redistributions in binary form must reproduce the above
  17  *    * copyright notice, this list of conditions and the following disclaimer in
  18  *      the documentation and/or other materials provided with the distribution.
  19  *    * Neither the name of Friendica nor the names of its contributors
  20  *      may be used to endorse or promote products derived from this software
  21  *      without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  25  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  * DISCLAIMED. IN NO EVENT SHALL FRIENDICA BE LIABLE FOR ANY DIRECT,
  27  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  30  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  31  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  32  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  */
  35
  36 use Friendica\App;
  37 use Friendica\BaseModule;
  38 use Friendica\Content\Text\Markdown;
  39 use Friendica\Core\Cache;
  40 use Friendica\Core\Hook;
  41 use Friendica\Core\L10n;
  42 use Friendica\Core\Logger;
  43 use Friendica\Core\Renderer;
  44 use Friendica\Database\DBA;
  45 use Friendica\Database\DBStructure;
  46 use Friendica\Model\Item;
  47 use Friendica\Model\Term;
  48 use Friendica\Module\Login;
  49 use Friendica\Network\HTTPException;
  50 use Friendica\Util\DateTimeFormat;
  51 use Psr\Http\Message\ResponseInterface;
  52 use Psr\Http\Message\ServerRequestInterface;
  53 use Symfony\Component\ExpressionLanguage;
  54
  55 require_once __DIR__ . DIRECTORY_SEPARATOR . 'vendor' . DIRECTORY_SEPARATOR . 'autoload.php';
  56
  57 function advancedcontentfilter_install()
  58 {
  59         Hook::register('dbstructure_definition'     , __FILE__, 'advancedcontentfilter_dbstructure_definition');
  60         Hook::register('prepare_body_content_filter', __FILE__, 'advancedcontentfilter_prepare_body_content_filter');
  61         Hook::register('addon_settings'             , __FILE__, 'advancedcontentfilter_addon_settings');
  62
  63         DBStructure::update(false, true);
  64
  65         Logger::log("installed advancedcontentfilter");
  66 }
  67
  68 function advancedcontentfilter_uninstall()
  69 {
  70         Hook::unregister('dbstructure_definition'     , __FILE__, 'advancedcontentfilter_dbstructure_definition');
  71         Hook::unregister('prepare_body_content_filter', __FILE__, 'advancedcontentfilter_prepare_body_content_filter');
  72         Hook::unregister('addon_settings'             , __FILE__, 'advancedcontentfilter_addon_settings');
  73 }
  74
  75 /*
  76  * Hooks
  77  */
  78
  79 function advancedcontentfilter_dbstructure_definition(App $a, &$database)
  80 {
  81         $database["advancedcontentfilter_rules"] = [
  82                 "comment" => "Advancedcontentfilter addon rules",
  83                 "fields" => [
  84                         "id"         => ["type" => "int unsigned", "not null" => "1", "extra" => "auto_increment", "primary" => "1", "comment" => "Auto incremented rule id"],
  85                         "uid"        => ["type" => "int unsigned", "not null" => "1", "comment" => "Owner user id"],
  86                         "name"       => ["type" => "varchar(255)", "not null" => "1", "comment" => "Rule name"],
  87                         "expression" => ["type" => "mediumtext"  , "not null" => "1", "comment" => "Expression text"],
  88                         "serialized" => ["type" => "mediumtext"  , "not null" => "1", "comment" => "Serialized parsed expression"],
  89                         "active"     => ["type" => "boolean"     , "not null" => "1", "default" => "1", "comment" => "Whether the rule is active or not"],
  90                         "created"    => ["type" => "datetime"    , "not null" => "1", "default" => DBA::NULL_DATETIME, "comment" => "Creation date"],
  91                 ],
  92                 "indexes" => [
  93                         "PRIMARY" => ["id"],
  94                         "uid_active" => ["uid", "active"],
  95                 ]
  96         ];
  97 }
  98
  99 function advancedcontentfilter_prepare_body_content_filter(App $a, &$hook_data)
 100 {
 101         static $expressionLanguage;
 102
 103         if (is_null($expressionLanguage)) {
 104                 $expressionLanguage = new ExpressionLanguage\ExpressionLanguage();
 105         }
 106
 107         if (!local_user()) {
 108                 return;
 109         }
 110
 111         $vars = [];
 112         foreach ($hook_data['item'] as $key => $value) {
 113                 $vars[str_replace('-', '_', $key)] = $value;
 114         }
 115
 116         $rules = Cache::get('rules_' . local_user());
 117         if (!isset($rules)) {
 118                 $rules = DBA::toArray(DBA::select(
 119                         'advancedcontentfilter_rules',
 120                         ['name', 'expression', 'serialized'],
 121                         ['uid' => local_user(), 'active' => true]
 122                 ));
 123         }
 124
 125         if ($rules) {
 126                 foreach($rules as $rule) {
 127                         try {
 128                                 $serializedParsedExpression = new ExpressionLanguage\SerializedParsedExpression(
 129                                         $rule['expression'],
 130                                         $rule['serialized']
 131                                 );
 132
 133                                 // The error suppression operator is used because of potentially broken user-supplied regular expressions
 134                                 $found = (bool) @$expressionLanguage->evaluate($serializedParsedExpression, $vars);
 135                         } catch (Exception $e) {
 136                                 $found = false;
 137                         }
 138
 139                         if ($found) {
 140                                 $hook_data['filter_reasons'][] = L10n::t('Filtered by rule: %s', $rule['name']);
 141                                 break;
 142                         }
 143                 }
 144         }
 145 }
 146
 147
 148 function advancedcontentfilter_addon_settings(App $a, &$s)
 149 {
 150         if (!local_user()) {
 151                 return;
 152         }
 153
 154         $advancedcontentfilter = L10n::t('Advanced Content Filter');
 155
 156         $s .= <<<HTML
 157                 <span class="settings-block fakelink" style="display: block;"><h3><a href="advancedcontentfilter">$advancedcontentfilter <i class="glyphicon glyphicon-share"></i></a></h3></span>
 158 HTML;
 159
 160         return;
 161 }
 162
 163 /*
 164  * Module
 165  */
 166
 167 function advancedcontentfilter_module() {}
 168
 169 function advancedcontentfilter_init(App $a)
 170 {
 171         if ($a->argc > 1 && $a->argv[1] == 'api') {
 172                 $slim = new \Slim\App();
 173
 174                 require __DIR__ . '/src/middlewares.php';
 175
 176                 require __DIR__ . '/src/routes.php';
 177                 $slim->run();
 178
 179                 exit;
 180         }
 181 }
 182
 183 function advancedcontentfilter_content(App $a)
 184 {
 185         if (!local_user()) {
 186                 return Login::form('/' . implode('/', $a->argv));
 187         }
 188
 189         if ($a->argc > 1 && $a->argv[1] == 'help') {
 190                 $lang = $a->user['language'];
 191
 192                 $default_dir = 'addon/advancedcontentfilter/doc/';
 193                 $help_file = 'advancedcontentfilter.md';
 194                 $help_path = $default_dir . $help_file;
 195                 if (file_exists($default_dir . $lang . '/' . $help_file)) {
 196                         $help_path = $default_dir . $lang . '/' . $help_file;
 197                 }
 198
 199                 $content = file_get_contents($help_path);
 200
 201                 $html = Markdown::convert($content, false);
 202
 203                 $html = str_replace('code>', 'key>', $html);
 204
 205                 return $html;
 206         } else {
 207                 $t = Renderer::getMarkupTemplate('settings.tpl', 'addon/advancedcontentfilter/');
 208                 return Renderer::replaceMacros($t, [
 209                         '$messages' => [
 210                                 'backtosettings'    => L10n::t('Back to Addon Settings'),
 211                                 'title'             => L10n::t('Advanced Content Filter'),
 212                                 'add_a_rule'        => L10n::t('Add a Rule'),
 213                                 'help'              => L10n::t('Help'),
 214                                 'intro'             => L10n::t('Add and manage your personal content filter rules in this screen. Rules have a name and an arbitrary expression that will be matched against post data. For a complete reference of the available operations and variables, check the help page.'),
 215                                 'your_rules'        => L10n::t('Your rules'),
 216                                 'no_rules'          => L10n::t('You have no rules yet! Start adding one by clicking on the button above next to the title.'),
 217                                 'disabled'          => L10n::t('Disabled'),
 218                                 'enabled'           => L10n::t('Enabled'),
 219                                 'disable_this_rule' => L10n::t('Disable this rule'),
 220                                 'enable_this_rule'  => L10n::t('Enable this rule'),
 221                                 'edit_this_rule'    => L10n::t('Edit this rule'),
 222                                 'edit_the_rule'     => L10n::t('Edit the rule'),
 223                                 'save_this_rule'    => L10n::t('Save this rule'),
 224                                 'delete_this_rule'  => L10n::t('Delete this rule'),
 225                                 'rule'              => L10n::t('Rule'),
 226                                 'close'             => L10n::t('Close'),
 227                                 'addtitle'          => L10n::t('Add new rule'),
 228                                 'rule_name'         => L10n::t('Rule Name'),
 229                                 'rule_expression'   => L10n::t('Rule Expression'),
 230                                 'cancel'            => L10n::t('Cancel'),
 231                         ],
 232                         '$current_theme' => $a->getCurrentTheme(),
 233                         '$rules' => advancedcontentfilter_get_rules(),
 234                         '$form_security_token' => BaseModule::getFormSecurityToken()
 235                 ]);
 236         }
 237 }
 238
 239 /*
 240  * Common functions
 241  */
 242 function advancedcontentfilter_build_fields($data)
 243 {
 244         $fields = [];
 245
 246         if (!empty($data['name'])) {
 247                 $fields['name'] = $data['name'];
 248         }
 249
 250         if (!empty($data['expression'])) {
 251                 $allowed_keys = [
 252                         'author_id', 'author_link', 'author_name', 'author_avatar',
 253                         'owner_id', 'owner_link', 'owner_name', 'owner_avatar',
 254                         'contact_id', 'uid', 'id', 'parent', 'uri',
 255                         'thr_parent', 'parent_uri',
 256                         'content_warning',
 257                         'commented', 'created', 'edited', 'received',
 258                         'verb', 'object_type', 'postopts', 'plink', 'guid', 'wall', 'private', 'starred',
 259                         'title', 'body',
 260                         'file', 'event_id', 'location', 'coord', 'app', 'attach',
 261                         'rendered_hash', 'rendered_html', 'object',
 262                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 263                         'item_id', 'item_network', 'author_thumb', 'owner_thumb',
 264                         'network', 'url', 'name', 'writable', 'self',
 265                         'cid', 'alias',
 266                         'event_created', 'event_edited', 'event_start', 'event_finish', 'event_summary',
 267                         'event_desc', 'event_location', 'event_type', 'event_nofinish', 'event_adjust', 'event_ignore',
 268                         'children', 'pagedrop', 'tags', 'hashtags', 'mentions',
 269                 ];
 270
 271                 $expressionLanguage = new ExpressionLanguage\ExpressionLanguage();
 272
 273                 $parsedExpression = $expressionLanguage->parse($data['expression'], $allowed_keys);
 274
 275                 $serialized = serialize($parsedExpression->getNodes());
 276
 277                 $fields['expression'] = $data['expression'];
 278                 $fields['serialized'] = $serialized;
 279         }
 280
 281         if (isset($data['active'])) {
 282                 $fields['active'] = intval($data['active']);
 283         } else {
 284                 $fields['active'] = 1;
 285         }
 286
 287         return $fields;
 288 }
 289
 290 /*
 291  * API
 292  */
 293
 294 function advancedcontentfilter_get_rules()
 295 {
 296         if (!local_user()) {
 297                 throw new HTTPException\UnauthorizedException(L10n::t('You must be logged in to use this method'));
 298         }
 299
 300         $rules = DBA::toArray(DBA::select('advancedcontentfilter_rules', [], ['uid' => local_user()]));
 301
 302         return json_encode($rules);
 303 }
 304
 305 function advancedcontentfilter_get_rules_id(ServerRequestInterface $request, ResponseInterface $response, $args)
 306 {
 307         if (!local_user()) {
 308                 throw new HTTPException\UnauthorizedException(L10n::t('You must be logged in to use this method'));
 309         }
 310
 311         $rule = DBA::selectFirst('advancedcontentfilter_rules', [], ['id' => $args['id'], 'uid' => local_user()]);
 312
 313         return json_encode($rule);
 314 }
 315
 316 function advancedcontentfilter_post_rules(ServerRequestInterface $request)
 317 {
 318         if (!local_user()) {
 319                 throw new HTTPException\UnauthorizedException(L10n::t('You must be logged in to use this method'));
 320         }
 321
 322         if (!BaseModule::checkFormSecurityToken()) {
 323                 throw new HTTPException\BadRequestException(L10n::t('Invalid form security token, please refresh the page.'));
 324         }
 325
 326         $data = json_decode($request->getBody(), true);
 327
 328         try {
 329                 $fields = advancedcontentfilter_build_fields($data);
 330         } catch (Exception $e) {
 331                 throw new HTTPException\BadRequestException($e->getMessage(), 0, $e);
 332         }
 333
 334         if (empty($fields['name']) || empty($fields['expression'])) {
 335                 throw new HTTPException\BadRequestException(L10n::t('The rule name and expression are required.'));
 336         }
 337
 338         $fields['uid'] = local_user();
 339         $fields['created'] = DateTimeFormat::utcNow();
 340
 341         if (!DBA::insert('advancedcontentfilter_rules', $fields)) {
 342                 throw new HTTPException\ServiceUnavaiableException(DBA::errorMessage());
 343         }
 344
 345         $rule = DBA::selectFirst('advancedcontentfilter_rules', [], ['id' => DBA::lastInsertId()]);
 346
 347         return json_encode(['message' => L10n::t('Rule successfully added'), 'rule' => $rule]);
 348 }
 349
 350 function advancedcontentfilter_put_rules_id(ServerRequestInterface $request, ResponseInterface $response, $args)
 351 {
 352         if (!local_user()) {
 353                 throw new HTTPException\UnauthorizedException(L10n::t('You must be logged in to use this method'));
 354         }
 355
 356         if (!BaseModule::checkFormSecurityToken()) {
 357                 throw new HTTPException\BadRequestException(L10n::t('Invalid form security token, please refresh the page.'));
 358         }
 359
 360         if (!DBA::exists('advancedcontentfilter_rules', ['id' => $args['id'], 'uid' => local_user()])) {
 361                 throw new HTTPException\NotFoundException(L10n::t('Rule doesn\'t exist or doesn\'t belong to you.'));
 362         }
 363
 364         $data = json_decode($request->getBody(), true);
 365
 366         try {
 367                 $fields = advancedcontentfilter_build_fields($data);
 368         } catch (Exception $e) {
 369                 throw new HTTPException\BadRequestException($e->getMessage(), 0, $e);
 370         }
 371
 372         if (!DBA::update('advancedcontentfilter_rules', $fields, ['id' => $args['id']])) {
 373                 throw new HTTPException\ServiceUnavaiableException(DBA::errorMessage());
 374         }
 375
 376         return json_encode(['message' => L10n::t('Rule successfully updated')]);
 377 }
 378
 379 function advancedcontentfilter_delete_rules_id(ServerRequestInterface $request, ResponseInterface $response, $args)
 380 {
 381         if (!local_user()) {
 382                 throw new HTTPException\UnauthorizedException(L10n::t('You must be logged in to use this method'));
 383         }
 384
 385         if (!BaseModule::checkFormSecurityToken()) {
 386                 throw new HTTPException\BadRequestException(L10n::t('Invalid form security token, please refresh the page.'));
 387         }
 388
 389         if (!DBA::exists('advancedcontentfilter_rules', ['id' => $args['id'], 'uid' => local_user()])) {
 390                 throw new HTTPException\NotFoundException(L10n::t('Rule doesn\'t exist or doesn\'t belong to you.'));
 391         }
 392
 393         if (!DBA::delete('advancedcontentfilter_rules', ['id' => $args['id']])) {
 394                 throw new HTTPException\ServiceUnavaiableException(DBA::errorMessage());
 395         }
 396
 397         return json_encode(['message' => L10n::t('Rule successfully deleted')]);
 398 }
 399
 400 function advancedcontentfilter_get_variables_guid(ServerRequestInterface $request, ResponseInterface $response, $args)
 401 {
 402         if (!local_user()) {
 403                 throw new HTTPException\UnauthorizedException(L10n::t('You must be logged in to use this method'));
 404         }
 405
 406         if (!isset($args['guid'])) {
 407                 throw new HTTPException\BadRequestException(L10n::t('Missing argument: guid.'));
 408         }
 409
 410         $condition = ["`guid` = ? AND (`uid` = ? OR `uid` = 0)", $args['guid'], local_user()];
 411         $params = ['order' => ['uid' => true]];
 412         $item = Item::selectFirstForUser(local_user(), [], $condition, $params);
 413
 414         if (!DBA::isResult($item)) {
 415                 throw new HTTPException\NotFoundException(L10n::t('Unknown post with guid: %s', $args['guid']));
 416         }
 417
 418         $tags = Term::populateTagsFromItem($item);
 419
 420         $item['tags'] = $tags['tags'];
 421         $item['hashtags'] = $tags['hashtags'];
 422         $item['mentions'] = $tags['mentions'];
 423
 424         $return = [];
 425         foreach ($item as $key => $value) {
 426                 $return[str_replace('-', '_', $key)] = $value;
 427         }
 428
 429         return json_encode(['variables' => str_replace('\\\'', '\'', var_export($return, true))]);
 430 }