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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * The main StopWords class. |
| 5 | * |
| 6 | * This Source Code Form is subject to the terms of the Mozilla Public License, |
| 7 | * v. 2.0. If a copy of the MPL was not distributed with this file, You can |
| 8 | * obtain one at https://mozilla.org/MPL/2.0/. |
| 9 | * |
| 10 | * @package phpMyFAQ |
| 11 | * @author Anatoliy Belsky |
| 12 | * @author Matteo Scaramuccia <matteo@phpmyfaq.de> |
| 13 | * @copyright 2009-2026 phpMyFAQ Team |
| 14 | * @license https://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0 |
| 15 | * @link https://www.phpmyfaq.de |
| 16 | * @since 2009-04-01 |
| 17 | */ |
| 18 | |
| 19 | declare(strict_types=1); |
| 20 | |
| 21 | namespace phpMyFAQ; |
| 22 | |
| 23 | /** |
| 24 | * Class StopWords |
| 25 | * |
| 26 | * @package phpMyFAQ |
| 27 | */ |
| 28 | class StopWords |
| 29 | { |
| 30 | private string $language; |
| 31 | |
| 32 | private readonly string $tableName; |
| 33 | |
| 34 | public function __construct( |
| 35 | private readonly Configuration $configuration, |
| 36 | ) { |
| 37 | $this->tableName = Database::getTablePrefix() . 'faqstopwords'; |
| 38 | } |
| 39 | |
| 40 | public function getLanguage(): string |
| 41 | { |
| 42 | return $this->language; |
| 43 | } |
| 44 | |
| 45 | public function getTableName(): string |
| 46 | { |
| 47 | return $this->tableName; |
| 48 | } |
| 49 | |
| 50 | public function setLanguage(string $language): StopWords |
| 51 | { |
| 52 | $this->language = $language; |
| 53 | return $this; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * Add a word to the stop words dictionary. |
| 58 | * If the given word already exists, false is returned. |
| 59 | */ |
| 60 | public function add(string $word): bool |
| 61 | { |
| 62 | if (!$this->match($word)) { |
| 63 | $sql = sprintf( |
| 64 | "INSERT INTO %s VALUES(%d, '%s', '%s')", |
| 65 | $this->getTableName(), |
| 66 | $this->configuration->getDb()->nextId($this->tableName, 'id'), |
| 67 | $this->configuration->getDb()->escape($this->language), |
| 68 | $this->configuration->getDb()->escape($word), |
| 69 | ); |
| 70 | |
| 71 | return (bool) $this->configuration->getDb()->query($sql); |
| 72 | } |
| 73 | |
| 74 | return false; |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Update a word in the stop words dictionary. |
| 79 | */ |
| 80 | public function update(int $id, string $word): bool |
| 81 | { |
| 82 | $sql = "UPDATE %s SET stopword = '%s' WHERE id = %d AND lang = '%s'"; |
| 83 | $sql = sprintf( |
| 84 | $sql, |
| 85 | $this->getTableName(), |
| 86 | $this->configuration->getDb()->escape($word), |
| 87 | $id, |
| 88 | $this->configuration->getDb()->escape($this->language), |
| 89 | ); |
| 90 | |
| 91 | return (bool) $this->configuration->getDb()->query($sql); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Remove a word from the stop word dictionary. |
| 96 | */ |
| 97 | public function remove(int $id): bool |
| 98 | { |
| 99 | $sql = sprintf( |
| 100 | "DELETE FROM %s WHERE id = %d AND lang = '%s'", |
| 101 | $this->getTableName(), |
| 102 | $id, |
| 103 | $this->configuration->getDb()->escape($this->language), |
| 104 | ); |
| 105 | |
| 106 | return (bool) $this->configuration->getDb()->query($sql); |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Match a word against the stop words dictionary. |
| 111 | */ |
| 112 | public function match(string $word): bool |
| 113 | { |
| 114 | $sql = sprintf( |
| 115 | "SELECT id FROM %s WHERE LOWER(stopword) = LOWER('%s') AND lang = '%s'", |
| 116 | $this->getTableName(), |
| 117 | $this->configuration->getDb()->escape($word), |
| 118 | $this->configuration->getDb()->escape($this->language), |
| 119 | ); |
| 120 | |
| 121 | $result = $this->configuration->getDb()->query($sql); |
| 122 | |
| 123 | return $this->configuration->getDb()->numRows($result) > 0; |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * Retrieve all the stop words by a certain language. |
| 128 | * |
| 129 | * @param string|null $lang Language to retrieve stop words by |
| 130 | * @return array<array-key, string|\stdClass> Strings when $wordsOnly is true, otherwise row objects |
| 131 | */ |
| 132 | public function getByLang(?string $lang = null, bool $wordsOnly = false): array |
| 133 | { |
| 134 | $lang = is_null($lang) ? $this->configuration->getLanguage()->getLanguage() : $lang; |
| 135 | $sql = sprintf( |
| 136 | "SELECT id, lang, LOWER(stopword) AS stopword FROM %s WHERE lang = '%s'", |
| 137 | $this->getTableName(), |
| 138 | $this->configuration->getDb()->escape($lang), |
| 139 | ); |
| 140 | |
| 141 | $result = $this->configuration->getDb()->query($sql); |
| 142 | |
| 143 | $stopWords = []; |
| 144 | |
| 145 | if (!$wordsOnly) { |
| 146 | return $this->configuration->getDb()->fetchAll($result) ?? []; |
| 147 | } |
| 148 | |
| 149 | while (true) { |
| 150 | $row = $this->configuration->getDb()->fetchObject($result); |
| 151 | if (!is_object($row)) { |
| 152 | break; |
| 153 | } |
| 154 | |
| 155 | $stopWords[] = Strings::htmlentities((string) $row->stopword); |
| 156 | } |
| 157 | |
| 158 | return $stopWords; |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * Filter some text cutting out all non-words and stop words. |
| 163 | * |
| 164 | * @param string $input text to filter |
| 165 | * @return string[] |
| 166 | */ |
| 167 | public function clean(string $input): array |
| 168 | { |
| 169 | $words = explode(' ', $input); |
| 170 | $stopWords = $this->getByLang(null, true); |
| 171 | $result = []; |
| 172 | |
| 173 | foreach ($words as $word) { |
| 174 | $word = Strings::strtolower($word); |
| 175 | if (is_numeric($word)) { |
| 176 | continue; |
| 177 | } |
| 178 | |
| 179 | if (1 >= Strings::strlen($word)) { |
| 180 | continue; |
| 181 | } |
| 182 | |
| 183 | if (in_array($word, $stopWords, strict: true)) { |
| 184 | continue; |
| 185 | } |
| 186 | |
| 187 | if (in_array($word, $result, strict: true)) { |
| 188 | continue; |
| 189 | } |
| 190 | |
| 191 | $result[] = $word; |
| 192 | } |
| 193 | |
| 194 | return $result; |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * This function checks the content against a bad word list if the banned |
| 199 | * word spam protection has been activated from the general phpMyFAQ |
| 200 | * configuration. |
| 201 | */ |
| 202 | public function checkBannedWord(string $content): bool |
| 203 | { |
| 204 | // Sanity checks |
| 205 | $content = Strings::strtolower(trim($content)); |
| 206 | if ('' === $content || !$this->configuration->get(item: 'spam.checkBannedWords')) { |
| 207 | return true; |
| 208 | } |
| 209 | |
| 210 | // Check if we check more than one word |
| 211 | $checkWords = explode(' ', $content); |
| 212 | if (1 === count($checkWords)) { |
| 213 | $checkWords = [$content]; |
| 214 | } |
| 215 | |
| 216 | $bannedWords = $this->getBannedWords(); |
| 217 | |
| 218 | // We just search a match of, at least, one banned word into $content |
| 219 | foreach ($bannedWords as $bannedWord) { |
| 220 | foreach ($checkWords as $checkWord) { |
| 221 | if (Strings::strtolower($checkWord) !== Strings::strtolower($bannedWord)) { |
| 222 | continue; |
| 223 | } |
| 224 | |
| 225 | return false; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | return true; |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * This function returns the banned words dictionary as an array. |
| 234 | * |
| 235 | * @return string[] |
| 236 | */ |
| 237 | private function getBannedWords(): array |
| 238 | { |
| 239 | $bannedTrimmedWords = []; |
| 240 | $bannedWordsFile = (string) PMF_SRC_DIR . '/blockedwords.txt'; |
| 241 | |
| 242 | // Read the dictionary |
| 243 | $bannedWordsContent = ''; |
| 244 | if (file_exists($bannedWordsFile) && is_readable($bannedWordsFile)) { |
| 245 | $fileContent = file_get_contents($bannedWordsFile); |
| 246 | $bannedWordsContent = $fileContent === false ? '' : $fileContent; |
| 247 | } |
| 248 | |
| 249 | // Trim it |
| 250 | foreach (explode("\n", $bannedWordsContent) as $word) { |
| 251 | $bannedTrimmedWords[] = trim($word); |
| 252 | } |
| 253 | |
| 254 | return $bannedTrimmedWords; |
| 255 | } |
| 256 | } |