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Segment.php
494 lines
| 1 | <?php |
| 2 | /** |
| 3 | * Piwik - free/libre analytics platform |
| 4 | * |
| 5 | * @link https://matomo.org |
| 6 | * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later |
| 7 | * |
| 8 | */ |
| 9 | namespace Piwik; |
| 10 | |
| 11 | use Exception; |
| 12 | use Piwik\API\Request; |
| 13 | use Piwik\ArchiveProcessor\Rules; |
| 14 | use Piwik\Container\StaticContainer; |
| 15 | use Piwik\DataAccess\LogQueryBuilder; |
| 16 | use Piwik\Plugins\SegmentEditor\SegmentEditor; |
| 17 | use Piwik\Segment\SegmentExpression; |
| 18 | |
| 19 | /** |
| 20 | * Limits the set of visits Piwik uses when aggregating analytics data. |
| 21 | * |
| 22 | * A segment is a condition used to filter visits. They can, for example, |
| 23 | * select visits that have a specific browser or come from a specific |
| 24 | * country, or both. |
| 25 | * |
| 26 | * Plugins that aggregate data stored in Piwik can support segments by |
| 27 | * using this class when generating aggregation SQL queries. |
| 28 | * |
| 29 | * ### Examples |
| 30 | * |
| 31 | * **Basic usage** |
| 32 | * |
| 33 | * $idSites = array(1,2,3); |
| 34 | * $segmentStr = "browserCode==ff;countryCode==CA"; |
| 35 | * $segment = new Segment($segmentStr, $idSites); |
| 36 | * |
| 37 | * $query = $segment->getSelectQuery( |
| 38 | * $select = "table.col1, table2.col2", |
| 39 | * $from = array("table", "table2"), |
| 40 | * $where = "table.col3 = ?", |
| 41 | * $bind = array(5), |
| 42 | * $orderBy = "table.col1 DESC", |
| 43 | * $groupBy = "table2.col2" |
| 44 | * ); |
| 45 | * |
| 46 | * Db::fetchAll($query['sql'], $query['bind']); |
| 47 | * |
| 48 | * **Creating a _null_ segment** |
| 49 | * |
| 50 | * $idSites = array(1,2,3); |
| 51 | * $segment = new Segment('', $idSites); |
| 52 | * // $segment->getSelectQuery will return a query that selects all visits |
| 53 | * |
| 54 | * @api |
| 55 | */ |
| 56 | class Segment |
| 57 | { |
| 58 | /** |
| 59 | * @var SegmentExpression |
| 60 | */ |
| 61 | protected $segmentExpression = null; |
| 62 | |
| 63 | /** |
| 64 | * @var string |
| 65 | */ |
| 66 | protected $string = null; |
| 67 | |
| 68 | /** |
| 69 | * @var string |
| 70 | */ |
| 71 | protected $originalString = null; |
| 72 | |
| 73 | /** |
| 74 | * @var array |
| 75 | */ |
| 76 | protected $idSites = null; |
| 77 | |
| 78 | /** |
| 79 | * @var LogQueryBuilder |
| 80 | */ |
| 81 | private $segmentQueryBuilder; |
| 82 | |
| 83 | /** |
| 84 | * @var bool |
| 85 | */ |
| 86 | private $isSegmentEncoded; |
| 87 | |
| 88 | /** |
| 89 | * Truncate the Segments to 8k |
| 90 | */ |
| 91 | const SEGMENT_TRUNCATE_LIMIT = 8192; |
| 92 | |
| 93 | /** |
| 94 | * Constructor. |
| 95 | * |
| 96 | * @param string $segmentCondition The segment condition, eg, `'browserCode=ff;countryCode=CA'`. |
| 97 | * @param array $idSites The list of sites the segment will be used with. Some segments are |
| 98 | * dependent on the site, such as goal segments. |
| 99 | * @throws |
| 100 | */ |
| 101 | public function __construct($segmentCondition, $idSites) |
| 102 | { |
| 103 | $this->segmentQueryBuilder = StaticContainer::get('Piwik\DataAccess\LogQueryBuilder'); |
| 104 | |
| 105 | $segmentCondition = trim($segmentCondition); |
| 106 | if (!SettingsPiwik::isSegmentationEnabled() |
| 107 | && !empty($segmentCondition) |
| 108 | ) { |
| 109 | throw new Exception("The Super User has disabled the Segmentation feature."); |
| 110 | } |
| 111 | |
| 112 | $this->originalString = $segmentCondition; |
| 113 | |
| 114 | // The segment expression can be urlencoded. Unfortunately, both the encoded and decoded versions |
| 115 | // can usually be parsed successfully. To pick the right one, we try both and pick the one w/ more |
| 116 | // successfully parsed subexpressions. |
| 117 | $subexpressionsDecoded = 0; |
| 118 | try { |
| 119 | $this->initializeSegment(urldecode($segmentCondition), $idSites); |
| 120 | $subexpressionsDecoded = $this->segmentExpression->getSubExpressionCount(); |
| 121 | } catch (Exception $e) { |
| 122 | // ignore |
| 123 | } |
| 124 | |
| 125 | $subexpressionsRaw = 0; |
| 126 | try { |
| 127 | $this->initializeSegment($segmentCondition, $idSites); |
| 128 | $subexpressionsRaw = $this->segmentExpression->getSubExpressionCount(); |
| 129 | } catch (Exception $e) { |
| 130 | // ignore |
| 131 | } |
| 132 | |
| 133 | if ($subexpressionsRaw > $subexpressionsDecoded) { |
| 134 | $this->initializeSegment($segmentCondition, $idSites); |
| 135 | $this->isSegmentEncoded = false; |
| 136 | } else { |
| 137 | $this->initializeSegment(urldecode($segmentCondition), $idSites); |
| 138 | $this->isSegmentEncoded = true; |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Returns the segment expression. |
| 144 | * @return SegmentExpression |
| 145 | * @api since Piwik 3.2.0 |
| 146 | */ |
| 147 | public function getSegmentExpression() |
| 148 | { |
| 149 | return $this->segmentExpression; |
| 150 | } |
| 151 | |
| 152 | private function getAvailableSegments() |
| 153 | { |
| 154 | // segment metadata |
| 155 | if (empty($this->availableSegments)) { |
| 156 | $this->availableSegments = Request::processRequest('API.getSegmentsMetadata', array( |
| 157 | 'idSites' => $this->idSites, |
| 158 | '_hideImplementationData' => 0, |
| 159 | 'filter_limit' => -1, |
| 160 | 'filter_offset' => 0, |
| 161 | '_showAllSegments' => 1, |
| 162 | ), []); |
| 163 | } |
| 164 | |
| 165 | return $this->availableSegments; |
| 166 | } |
| 167 | |
| 168 | private function getSegmentByName($name) |
| 169 | { |
| 170 | $segments = $this->getAvailableSegments(); |
| 171 | |
| 172 | foreach ($segments as $segment) { |
| 173 | if ($segment['segment'] == $name && !empty($name)) { |
| 174 | |
| 175 | // check permission |
| 176 | if (isset($segment['permission']) && $segment['permission'] != 1) { |
| 177 | throw new NoAccessException("You do not have enough permission to access the segment " . $name); |
| 178 | } |
| 179 | |
| 180 | return $segment; |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | throw new Exception("Segment '$name' is not a supported segment."); |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * @param $string |
| 189 | * @param $idSites |
| 190 | * @throws Exception |
| 191 | */ |
| 192 | protected function initializeSegment($string, $idSites) |
| 193 | { |
| 194 | // As a preventive measure, we restrict the filter size to a safe limit |
| 195 | $string = substr($string, 0, self::SEGMENT_TRUNCATE_LIMIT); |
| 196 | |
| 197 | $this->string = $string; |
| 198 | $this->idSites = $idSites; |
| 199 | $segment = new SegmentExpression($string); |
| 200 | $this->segmentExpression = $segment; |
| 201 | |
| 202 | // parse segments |
| 203 | $expressions = $segment->parseSubExpressions(); |
| 204 | $expressions = $this->getExpressionsWithUnionsResolved($expressions); |
| 205 | |
| 206 | // convert segments name to sql segment |
| 207 | // check that user is allowed to view this segment |
| 208 | // and apply a filter to the value to match if necessary (to map DB fields format) |
| 209 | $cleanedExpressions = array(); |
| 210 | foreach ($expressions as $expression) { |
| 211 | $operand = $expression[SegmentExpression::INDEX_OPERAND]; |
| 212 | $cleanedExpression = $this->getCleanedExpression($operand); |
| 213 | $expression[SegmentExpression::INDEX_OPERAND] = $cleanedExpression; |
| 214 | $cleanedExpressions[] = $expression; |
| 215 | } |
| 216 | |
| 217 | $segment->setSubExpressionsAfterCleanup($cleanedExpressions); |
| 218 | } |
| 219 | |
| 220 | private function getExpressionsWithUnionsResolved($expressions) |
| 221 | { |
| 222 | $expressionsWithUnions = array(); |
| 223 | foreach ($expressions as $expression) { |
| 224 | $operand = $expression[SegmentExpression::INDEX_OPERAND]; |
| 225 | $name = $operand[SegmentExpression::INDEX_OPERAND_NAME]; |
| 226 | |
| 227 | $availableSegment = $this->getSegmentByName($name); |
| 228 | |
| 229 | if (!empty($availableSegment['unionOfSegments'])) { |
| 230 | $count = 0; |
| 231 | foreach ($availableSegment['unionOfSegments'] as $segmentNameOfUnion) { |
| 232 | $count++; |
| 233 | $operator = SegmentExpression::BOOL_OPERATOR_OR; // we connect all segments within that union via OR |
| 234 | if ($count === count($availableSegment['unionOfSegments'])) { |
| 235 | $operator = $expression[SegmentExpression::INDEX_BOOL_OPERATOR]; |
| 236 | } |
| 237 | |
| 238 | $operand[SegmentExpression::INDEX_OPERAND_NAME] = $segmentNameOfUnion; |
| 239 | $expressionsWithUnions[] = array( |
| 240 | SegmentExpression::INDEX_BOOL_OPERATOR => $operator, |
| 241 | SegmentExpression::INDEX_OPERAND => $operand |
| 242 | ); |
| 243 | } |
| 244 | } else { |
| 245 | $expressionsWithUnions[] = array( |
| 246 | SegmentExpression::INDEX_BOOL_OPERATOR => $expression[SegmentExpression::INDEX_BOOL_OPERATOR], |
| 247 | SegmentExpression::INDEX_OPERAND => $operand |
| 248 | ); |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | return $expressionsWithUnions; |
| 253 | } |
| 254 | |
| 255 | /** |
| 256 | * Returns `true` if the segment is empty, `false` if otherwise. |
| 257 | */ |
| 258 | public function isEmpty() |
| 259 | { |
| 260 | return $this->segmentExpression->isEmpty(); |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * Detects whether the Piwik instance is configured to be able to archive this segment. It checks whether the segment |
| 265 | * will be either archived via browser or cli archiving. It does not check if the segment has been archived. If you |
| 266 | * want to know whether the segment has been archived, the actual report data needs to be requested. |
| 267 | * |
| 268 | * This method does not take any date/period into consideration. Meaning a Piwik instance might be able to archive |
| 269 | * this segment in general, but not for a certain period if eg the archiving of range dates is disabled. |
| 270 | * |
| 271 | * @return bool |
| 272 | */ |
| 273 | public function willBeArchived() |
| 274 | { |
| 275 | if ($this->isEmpty()) { |
| 276 | return true; |
| 277 | } |
| 278 | |
| 279 | $idSites = $this->idSites; |
| 280 | if (!is_array($idSites)) { |
| 281 | $idSites = array($this->idSites); |
| 282 | } |
| 283 | |
| 284 | return Rules::isRequestAuthorizedToArchive() |
| 285 | || Rules::isBrowserArchivingAvailableForSegments() |
| 286 | || Rules::isSegmentPreProcessed($idSites, $this); |
| 287 | } |
| 288 | |
| 289 | protected $availableSegments = array(); |
| 290 | |
| 291 | protected function getCleanedExpression($expression) |
| 292 | { |
| 293 | $name = $expression[SegmentExpression::INDEX_OPERAND_NAME]; |
| 294 | $matchType = $expression[SegmentExpression::INDEX_OPERAND_OPERATOR]; |
| 295 | $value = $expression[SegmentExpression::INDEX_OPERAND_VALUE]; |
| 296 | |
| 297 | $segment = $this->getSegmentByName($name); |
| 298 | $sqlName = $segment['sqlSegment']; |
| 299 | |
| 300 | if ($matchType != SegmentExpression::MATCH_IS_NOT_NULL_NOR_EMPTY |
| 301 | && $matchType != SegmentExpression::MATCH_IS_NULL_OR_EMPTY) { |
| 302 | |
| 303 | if (isset($segment['sqlFilterValue'])) { |
| 304 | $value = call_user_func($segment['sqlFilterValue'], $value, $segment['sqlSegment']); |
| 305 | } |
| 306 | |
| 307 | // apply presentation filter |
| 308 | if (isset($segment['sqlFilter'])) { |
| 309 | $value = call_user_func($segment['sqlFilter'], $value, $segment['sqlSegment'], $matchType, $name); |
| 310 | |
| 311 | if(is_null($value)) { // null is returned in TableLogAction::getIdActionFromSegment() |
| 312 | return array(null, $matchType, null); |
| 313 | } |
| 314 | |
| 315 | // sqlFilter-callbacks might return arrays for more complex cases |
| 316 | // e.g. see TableLogAction::getIdActionFromSegment() |
| 317 | if (is_array($value) && isset($value['SQL'])) { |
| 318 | // Special case: returned value is a sub sql expression! |
| 319 | $matchType = SegmentExpression::MATCH_ACTIONS_CONTAINS; |
| 320 | } |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | return array($sqlName, $matchType, $value); |
| 325 | } |
| 326 | |
| 327 | /** |
| 328 | * Returns the segment condition. |
| 329 | * |
| 330 | * @return string |
| 331 | */ |
| 332 | public function getString() |
| 333 | { |
| 334 | return $this->string; |
| 335 | } |
| 336 | |
| 337 | /** |
| 338 | * Returns a hash of the segment condition, or the empty string if the segment |
| 339 | * condition is empty. |
| 340 | * |
| 341 | * @return string |
| 342 | */ |
| 343 | public function getHash() |
| 344 | { |
| 345 | if (empty($this->string)) { |
| 346 | return ''; |
| 347 | } |
| 348 | return self::getSegmentHash($this->string); |
| 349 | } |
| 350 | |
| 351 | public static function getSegmentHash($definition) |
| 352 | { |
| 353 | // urldecode to normalize the string, as browsers may send slightly different payloads for the same archive |
| 354 | return md5(urldecode($definition)); |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * Extend an SQL query that aggregates data over one of the 'log_' tables with segment expressions. |
| 359 | * |
| 360 | * @param string $select The select clause. Should NOT include the **SELECT** just the columns, eg, |
| 361 | * `'t1.col1 as col1, t2.col2 as col2'`. |
| 362 | * @param array|string $from Array of table names (without prefix), eg, `array('log_visit', 'log_conversion')`. |
| 363 | * @param false|string $where (optional) Where clause, eg, `'t1.col1 = ? AND t2.col2 = ?'`. |
| 364 | * @param array|string $bind (optional) Bind parameters, eg, `array($col1Value, $col2Value)`. |
| 365 | * @param false|string $orderBy (optional) Order by clause, eg, `"t1.col1 ASC"`. |
| 366 | * @param false|string $groupBy (optional) Group by clause, eg, `"t2.col2"`. |
| 367 | * @param int $limit Limit number of result to $limit |
| 368 | * @param int $offset Specified the offset of the first row to return |
| 369 | * @param bool $forceGroupBy Force the group by and not using a subquery. Note: This may make the query slower see https://github.com/matomo-org/matomo/issues/9200#issuecomment-183641293 |
| 370 | * A $groupBy value needs to be set for this to work. |
| 371 | * @param int If set to value >= 1 then the Select query (and All inner queries) will be LIMIT'ed by this value. |
| 372 | * Use only when you're not aggregating or it will sample the data. |
| 373 | * @return string The entire select query. |
| 374 | */ |
| 375 | public function getSelectQuery($select, $from, $where = false, $bind = array(), $orderBy = false, $groupBy = false, $limit = 0, $offset = 0, $forceGroupBy = false) |
| 376 | { |
| 377 | $segmentExpression = $this->segmentExpression; |
| 378 | |
| 379 | $limitAndOffset = null; |
| 380 | if($limit > 0) { |
| 381 | $limitAndOffset = (int) $offset . ', ' . (int) $limit; |
| 382 | } |
| 383 | |
| 384 | try { |
| 385 | if ($forceGroupBy && $groupBy) { |
| 386 | $this->segmentQueryBuilder->forceInnerGroupBySubselect(LogQueryBuilder::FORCE_INNER_GROUP_BY_NO_SUBSELECT); |
| 387 | } |
| 388 | $result = $this->segmentQueryBuilder->getSelectQueryString($segmentExpression, $select, $from, $where, $bind, |
| 389 | $groupBy, $orderBy, $limitAndOffset); |
| 390 | } catch (Exception $e) { |
| 391 | if ($forceGroupBy && $groupBy) { |
| 392 | $this->segmentQueryBuilder->forceInnerGroupBySubselect(''); |
| 393 | } |
| 394 | throw $e; |
| 395 | } |
| 396 | |
| 397 | if ($forceGroupBy && $groupBy) { |
| 398 | $this->segmentQueryBuilder->forceInnerGroupBySubselect(''); |
| 399 | } |
| 400 | return $result; |
| 401 | } |
| 402 | |
| 403 | /** |
| 404 | * Returns the segment string. |
| 405 | * |
| 406 | * @return string |
| 407 | */ |
| 408 | public function __toString() |
| 409 | { |
| 410 | return (string) $this->getString(); |
| 411 | } |
| 412 | |
| 413 | /** |
| 414 | * Combines this segment with another segment condition, if the segment condition is not already |
| 415 | * in the segment. |
| 416 | * |
| 417 | * The combination is naive in that it does not take order of operations into account. |
| 418 | * |
| 419 | * @param string $segment |
| 420 | * @param string $operator The operator to use. Should be either SegmentExpression::AND_DELIMITER |
| 421 | * or SegmentExpression::OR_DELIMITER. |
| 422 | * @param string $segmentCondition The segment condition to add. |
| 423 | * @return string |
| 424 | * @throws Exception |
| 425 | */ |
| 426 | public static function combine($segment, $operator, $segmentCondition) |
| 427 | { |
| 428 | if (empty($segment)) { |
| 429 | return $segmentCondition; |
| 430 | } |
| 431 | |
| 432 | if (empty($segmentCondition) |
| 433 | || self::containsCondition($segment, $operator, $segmentCondition) |
| 434 | ) { |
| 435 | return $segment; |
| 436 | } |
| 437 | |
| 438 | return $segment . $operator . $segmentCondition; |
| 439 | } |
| 440 | |
| 441 | private static function containsCondition($segment, $operator, $segmentCondition) |
| 442 | { |
| 443 | // check when segment/condition are of same encoding |
| 444 | return strpos($segment, $operator . $segmentCondition) !== false |
| 445 | || strpos($segment, $segmentCondition . $operator) !== false |
| 446 | |
| 447 | // check when both operator & condition are urlencoded in $segment |
| 448 | || strpos($segment, urlencode($operator . $segmentCondition)) !== false |
| 449 | || strpos($segment, urlencode($segmentCondition . $operator)) !== false |
| 450 | |
| 451 | // check when operator is not urlencoded, but condition is in $segment |
| 452 | || strpos($segment, $operator . urlencode($segmentCondition)) !== false |
| 453 | || strpos($segment, urlencode($segmentCondition) . $operator) !== false |
| 454 | |
| 455 | // check when segment condition is urlencoded & $segment isn't |
| 456 | || strpos($segment, $operator . urldecode($segmentCondition)) !== false |
| 457 | || strpos($segment, urldecode($segmentCondition) . $operator) !== false |
| 458 | |
| 459 | || $segment === $segmentCondition |
| 460 | || $segment === urlencode($segmentCondition) |
| 461 | || $segment === urldecode($segmentCondition); |
| 462 | } |
| 463 | |
| 464 | public function getStoredSegmentName($idSite) |
| 465 | { |
| 466 | $segment = $this->getString(); |
| 467 | if (empty($segment)) { |
| 468 | return Piwik::translate('SegmentEditor_DefaultAllVisits'); |
| 469 | } |
| 470 | |
| 471 | $availableSegments = SegmentEditor::getAllSegmentsForSite($idSite); |
| 472 | |
| 473 | $foundStoredSegment = null; |
| 474 | foreach ($availableSegments as $storedSegment) { |
| 475 | if ($storedSegment['definition'] == $segment |
| 476 | || $storedSegment['definition'] == urldecode($segment) |
| 477 | || $storedSegment['definition'] == urlencode($segment) |
| 478 | |
| 479 | || $storedSegment['definition'] == $this->originalString |
| 480 | || $storedSegment['definition'] == urldecode($this->originalString) |
| 481 | || $storedSegment['definition'] == urlencode($this->originalString) |
| 482 | ) { |
| 483 | $foundStoredSegment = $storedSegment; |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | if (isset($foundStoredSegment)) { |
| 488 | return $foundStoredSegment['name']; |
| 489 | } |
| 490 | |
| 491 | return $this->isSegmentEncoded ? urldecode($segment) : $segment; |
| 492 | } |
| 493 | } |
| 494 |