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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * phpMyFAQ database-based search classes. |
| 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 Thorsten Rinne <thorsten@phpmyfaq.de> |
| 12 | * @copyright 2010-2026 phpMyFAQ Team |
| 13 | * @license https://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0 |
| 14 | * @link https://www.phpmyfaq.de |
| 15 | * @since 2010-06-06 |
| 16 | */ |
| 17 | |
| 18 | declare(strict_types=1); |
| 19 | |
| 20 | namespace phpMyFAQ\Search; |
| 21 | |
| 22 | use phpMyFAQ\Strings; |
| 23 | |
| 24 | /** |
| 25 | * Class SearchDatabase |
| 26 | * |
| 27 | * @package phpMyFAQ\Search |
| 28 | */ |
| 29 | class SearchDatabase extends AbstractSearch implements SearchInterface |
| 30 | { |
| 31 | /** |
| 32 | * LIKE/ILIKE escape character. Every ESCAPE clause built by this class or |
| 33 | * its driver subclasses must use this character, otherwise the wildcard |
| 34 | * escaping in escapeLikeWildcards() is silently disabled. |
| 35 | */ |
| 36 | protected const string LIKE_ESCAPE_CHARACTER = '|'; |
| 37 | |
| 38 | /** |
| 39 | * Searching database table. |
| 40 | */ |
| 41 | protected string $table = ''; |
| 42 | |
| 43 | /** |
| 44 | * Joined searching database table. |
| 45 | */ |
| 46 | protected string $joinedTable = ''; |
| 47 | |
| 48 | /** |
| 49 | * Columns for the result set. |
| 50 | * |
| 51 | * @var string[] |
| 52 | */ |
| 53 | protected array $resultColumns = []; |
| 54 | |
| 55 | /** |
| 56 | * Columns for the joined table. |
| 57 | * |
| 58 | * @var string[] |
| 59 | */ |
| 60 | protected array $joinedColumns = []; |
| 61 | |
| 62 | /** |
| 63 | * Matching columns for the search. |
| 64 | * |
| 65 | * @var string[] |
| 66 | */ |
| 67 | protected array $matchingColumns = []; |
| 68 | |
| 69 | /** |
| 70 | * Conditions columns with their values. |
| 71 | * |
| 72 | * @var array<string, array<int>|int|string> |
| 73 | */ |
| 74 | protected array $conditions = []; |
| 75 | |
| 76 | /** |
| 77 | * Flag if a database supports search relevance. |
| 78 | */ |
| 79 | protected bool $relevanceSupport = false; |
| 80 | |
| 81 | /** |
| 82 | * Prepares the search and executes it. |
| 83 | * |
| 84 | * @param string $searchTerm Search term |
| 85 | */ |
| 86 | public function search(string $searchTerm): mixed |
| 87 | { |
| 88 | $query = sprintf( |
| 89 | ' |
| 90 | SELECT |
| 91 | %s |
| 92 | FROM |
| 93 | %s %s %s |
| 94 | WHERE |
| 95 | %s = %s', |
| 96 | $this->getResultColumns(), |
| 97 | $this->getTable(), |
| 98 | $this->getJoinedTable(), |
| 99 | $this->getJoinedColumns(), |
| 100 | $this->getMatchingColumns(), |
| 101 | $searchTerm, |
| 102 | ); |
| 103 | |
| 104 | $this->resultSet = $this->configuration->getDb()->query($query); |
| 105 | |
| 106 | return $this->resultSet; |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Returns the part of the SQL query with the columns for the result set. |
| 111 | */ |
| 112 | public function getResultColumns(): string |
| 113 | { |
| 114 | return implode(', ', $this->resultColumns); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Sets the part of the SQL query with the columns for the result set. |
| 119 | * |
| 120 | * @param string[] $columns Array of columns |
| 121 | */ |
| 122 | public function setResultColumns(array $columns): SearchDatabase |
| 123 | { |
| 124 | $this->resultColumns = $columns; |
| 125 | |
| 126 | return $this; |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Returns the search table. |
| 131 | */ |
| 132 | public function getTable(): string |
| 133 | { |
| 134 | return $this->table; |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * Sets search table. |
| 139 | * |
| 140 | * @param string $table Table where search should be performed |
| 141 | */ |
| 142 | public function setTable(string $table): SearchDatabase |
| 143 | { |
| 144 | $this->table = $table; |
| 145 | |
| 146 | return $this; |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Returns the joined table. |
| 151 | */ |
| 152 | public function getJoinedTable(): string |
| 153 | { |
| 154 | if ($this->joinedTable === '' || $this->joinedTable === '0') { |
| 155 | return ''; |
| 156 | } |
| 157 | |
| 158 | return ' LEFT JOIN ' . $this->joinedTable . ' ON '; |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * Sets joined search table. |
| 163 | * |
| 164 | * @param string $joinedTable Joined table where search should be performed |
| 165 | */ |
| 166 | public function setJoinedTable(string $joinedTable = ''): SearchDatabase |
| 167 | { |
| 168 | $this->joinedTable = $joinedTable; |
| 169 | |
| 170 | return $this; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Returns the part of the SQL query with the columns for the join. |
| 175 | */ |
| 176 | public function getJoinedColumns(): string |
| 177 | { |
| 178 | $joinedColumns = ''; |
| 179 | |
| 180 | foreach ($this->joinedColumns as $joinedColumn) { |
| 181 | $joinedColumns .= $joinedColumn . ' AND '; |
| 182 | } |
| 183 | |
| 184 | return Strings::substr($joinedColumns, 0, -4); |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * Sets the part of the SQL query with the columns for the join. |
| 189 | * |
| 190 | * @param string[] $joinedColumns Array of columns |
| 191 | */ |
| 192 | public function setJoinedColumns(array $joinedColumns): SearchDatabase |
| 193 | { |
| 194 | $this->joinedColumns = $joinedColumns; |
| 195 | |
| 196 | return $this; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Returns the part of the SQL query with the matching columns. |
| 201 | */ |
| 202 | public function getMatchingColumns(): string |
| 203 | { |
| 204 | return implode(', ', $this->matchingColumns); |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * Sets the part of the SQL query with the matching columns. |
| 209 | * |
| 210 | * @param string[] $matchingColumns Array of columns |
| 211 | */ |
| 212 | public function setMatchingColumns(array $matchingColumns): SearchDatabase |
| 213 | { |
| 214 | $this->matchingColumns = $matchingColumns; |
| 215 | |
| 216 | return $this; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * Returns the part of the SQL query with the conditions. |
| 221 | */ |
| 222 | public function getConditions(): string |
| 223 | { |
| 224 | $conditions = ''; |
| 225 | $db = $this->configuration->getDb(); |
| 226 | |
| 227 | foreach ($this->conditions as $column => $value) { |
| 228 | if (!preg_match('/^[A-Za-z_][A-Za-z0-9_.]*$/', $column)) { |
| 229 | continue; |
| 230 | } |
| 231 | |
| 232 | $conditions .= match (true) { |
| 233 | is_array($value) => $this->buildInClause($column, $value), |
| 234 | is_int($value) => ' AND ' . $column . ' = ' . $value, |
| 235 | default => ' AND ' . $column . " = '" . $db->escape((string) $value) . "'", |
| 236 | }; |
| 237 | } |
| 238 | |
| 239 | return $conditions; |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * @param array<int|string> $value |
| 244 | */ |
| 245 | private function buildInClause(string $column, array $value): string |
| 246 | { |
| 247 | $ids = array_map(static fn($v): int => (int) $v, $value); |
| 248 | if ($ids === []) { |
| 249 | return ''; |
| 250 | } |
| 251 | |
| 252 | return ' AND ' . $column . ' IN (' . implode(', ', $ids) . ')'; |
| 253 | } |
| 254 | |
| 255 | /** |
| 256 | * Sets the part of the SQL query with the conditions. |
| 257 | * |
| 258 | * @param array<string, array<int>|int|string> $conditions Array of columns |
| 259 | */ |
| 260 | public function setConditions(array $conditions): SearchDatabase |
| 261 | { |
| 262 | $this->conditions = $conditions; |
| 263 | |
| 264 | return $this; |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * Creates the part for the WHERE clause. |
| 269 | * |
| 270 | * @param string $searchTerm Search term |
| 271 | */ |
| 272 | public function getMatchClause(string $searchTerm = ''): string |
| 273 | { |
| 274 | $splitTerms = Strings::preg_split("/\s+/", $searchTerm); |
| 275 | $keys = is_array($splitTerms) ? $splitTerms : []; |
| 276 | $numKeys = count($keys); |
| 277 | $numMatch = count($this->matchingColumns); |
| 278 | $where = ''; |
| 279 | |
| 280 | for ($i = 0; $i < $numKeys; ++$i) { |
| 281 | if ($where !== '') { |
| 282 | $where .= ' OR'; |
| 283 | } |
| 284 | |
| 285 | $where .= ' ('; |
| 286 | for ($j = 0; $j < $numMatch; ++$j) { |
| 287 | if ($j !== 0) { |
| 288 | $where .= ' OR '; |
| 289 | } |
| 290 | |
| 291 | $where = sprintf( |
| 292 | "%s%s LIKE '%%%s%%' ESCAPE '%s'", |
| 293 | $where, |
| 294 | $this->matchingColumns[$j], |
| 295 | self::escapeLikeWildcards($this->configuration->getDb()->escape((string) $keys[$i])), |
| 296 | self::LIKE_ESCAPE_CHARACTER, |
| 297 | ); |
| 298 | } |
| 299 | |
| 300 | $where .= ')'; |
| 301 | } |
| 302 | |
| 303 | return $where; |
| 304 | } |
| 305 | |
| 306 | /** |
| 307 | * Disables relevance support if we don't need it even if the database |
| 308 | * supports it. |
| 309 | */ |
| 310 | public function disableRelevance(): void |
| 311 | { |
| 312 | $this->relevanceSupport = false; |
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * Escapes LIKE wildcard metacharacters (%, _) in a search term |
| 317 | * to prevent LIKE wildcard injection. |
| 318 | */ |
| 319 | protected static function escapeLikeWildcards(string $term): string |
| 320 | { |
| 321 | $escape = self::LIKE_ESCAPE_CHARACTER; |
| 322 | |
| 323 | return str_replace([$escape, '%', '_'], [$escape . $escape, $escape . '%', $escape . '_'], $term); |
| 324 | } |
| 325 | } |