nextcloud /
server
Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like CardDavBackend often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use CardDavBackend, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 49 | class CardDavBackend implements BackendInterface, SyncSupport { |
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| 50 | |||
| 51 | const PERSONAL_ADDRESSBOOK_URI = 'contacts'; |
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| 52 | const PERSONAL_ADDRESSBOOK_NAME = 'Contacts'; |
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| 53 | |||
| 54 | /** @var Principal */ |
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| 55 | private $principalBackend; |
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| 56 | |||
| 57 | /** @var string */ |
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| 58 | private $dbCardsTable = 'cards'; |
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| 59 | |||
| 60 | /** @var string */ |
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| 61 | private $dbCardsPropertiesTable = 'cards_properties'; |
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| 62 | |||
| 63 | /** @var IDBConnection */ |
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| 64 | private $db; |
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| 65 | |||
| 66 | /** @var Backend */ |
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| 67 | private $sharingBackend; |
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| 68 | |||
| 69 | /** @var array properties to index */ |
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| 70 | public static $indexProperties = array( |
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| 71 | 'BDAY', 'UID', 'N', 'FN', 'TITLE', 'ROLE', 'NOTE', 'NICKNAME', |
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| 72 | 'ORG', 'CATEGORIES', 'EMAIL', 'TEL', 'IMPP', 'ADR', 'URL', 'GEO', 'CLOUD'); |
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| 73 | |||
| 74 | /** |
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| 75 | * @var string[] Map of uid => display name |
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| 76 | */ |
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| 77 | protected $userDisplayNames; |
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| 78 | |||
| 79 | /** @var IUserManager */ |
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| 80 | private $userManager; |
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| 81 | |||
| 82 | /** @var EventDispatcherInterface */ |
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| 83 | private $dispatcher; |
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| 84 | |||
| 85 | /** |
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| 86 | * CardDavBackend constructor. |
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| 87 | * |
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| 88 | * @param IDBConnection $db |
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| 89 | * @param Principal $principalBackend |
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| 90 | * @param IUserManager $userManager |
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| 91 | * @param EventDispatcherInterface $dispatcher |
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| 92 | */ |
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| 93 | public function __construct(IDBConnection $db, |
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| 94 | Principal $principalBackend, |
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| 95 | IUserManager $userManager, |
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| 96 | EventDispatcherInterface $dispatcher = null) { |
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| 97 | $this->db = $db; |
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| 98 | $this->principalBackend = $principalBackend; |
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| 99 | $this->userManager = $userManager; |
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| 100 | $this->dispatcher = $dispatcher; |
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| 101 | $this->sharingBackend = new Backend($this->db, $principalBackend, 'addressbook'); |
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| 102 | } |
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| 103 | |||
| 104 | /** |
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| 105 | * Return the number of address books for a principal |
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| 106 | * |
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| 107 | * @param $principalUri |
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| 108 | * @return int |
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| 109 | */ |
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| 110 | public function getAddressBooksForUserCount($principalUri) { |
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| 119 | |||
| 120 | /** |
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| 121 | * Returns the list of address books for a specific user. |
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| 122 | * |
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| 123 | * Every addressbook should have the following properties: |
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| 124 | * id - an arbitrary unique id |
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| 125 | * uri - the 'basename' part of the url |
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| 126 | * principaluri - Same as the passed parameter |
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| 127 | * |
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| 128 | * Any additional clark-notation property may be passed besides this. Some |
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| 129 | * common ones are : |
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| 130 | * {DAV:}displayname |
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| 131 | * {urn:ietf:params:xml:ns:carddav}addressbook-description |
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| 132 | * {http://calendarserver.org/ns/}getctag |
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| 133 | * |
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| 134 | * @param string $principalUri |
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| 135 | * @return array |
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| 136 | */ |
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| 137 | function getAddressBooksForUser($principalUri) { |
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| 218 | |||
| 219 | public function getUsersOwnAddressBooks($principalUri) { |
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| 246 | |||
| 247 | View Code Duplication | private function getUserDisplayName($uid) { |
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| 260 | |||
| 261 | /** |
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| 262 | * @param int $addressBookId |
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| 263 | */ |
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| 264 | public function getAddressBookById($addressBookId) { |
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| 291 | |||
| 292 | /** |
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| 293 | * @param $addressBookUri |
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| 294 | * @return array|null |
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| 295 | */ |
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| 296 | public function getAddressBooksByUri($principal, $addressBookUri) { |
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| 325 | |||
| 326 | /** |
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| 327 | * Updates properties for an address book. |
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| 328 | * |
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| 329 | * The list of mutations is stored in a Sabre\DAV\PropPatch object. |
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| 330 | * To do the actual updates, you must tell this object which properties |
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| 331 | * you're going to process with the handle() method. |
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| 332 | * |
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| 333 | * Calling the handle method is like telling the PropPatch object "I |
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| 334 | * promise I can handle updating this property". |
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| 335 | * |
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| 336 | * Read the PropPatch documentation for more info and examples. |
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| 337 | * |
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| 338 | * @param string $addressBookId |
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| 339 | * @param \Sabre\DAV\PropPatch $propPatch |
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| 340 | * @return void |
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| 341 | */ |
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| 342 | function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch) { |
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| 377 | |||
| 378 | /** |
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| 379 | * Creates a new address book |
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| 380 | * |
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| 381 | * @param string $principalUri |
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| 382 | * @param string $url Just the 'basename' of the url. |
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| 383 | * @param array $properties |
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| 384 | * @return int |
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| 385 | * @throws BadRequest |
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| 386 | */ |
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| 387 | function createAddressBook($principalUri, $url, array $properties) { |
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| 431 | |||
| 432 | /** |
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| 433 | * Deletes an entire addressbook and all its contents |
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| 434 | * |
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| 435 | * @param mixed $addressBookId |
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| 436 | * @return void |
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| 437 | */ |
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| 438 | function deleteAddressBook($addressBookId) { |
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| 462 | |||
| 463 | /** |
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| 464 | * Returns all cards for a specific addressbook id. |
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| 465 | * |
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| 466 | * This method should return the following properties for each card: |
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| 467 | * * carddata - raw vcard data |
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| 468 | * * uri - Some unique url |
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| 469 | * * lastmodified - A unix timestamp |
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| 470 | * |
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| 471 | * It's recommended to also return the following properties: |
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| 472 | * * etag - A unique etag. This must change every time the card changes. |
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| 473 | * * size - The size of the card in bytes. |
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| 474 | * |
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| 475 | * If these last two properties are provided, less time will be spent |
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| 476 | * calculating them. If they are specified, you can also ommit carddata. |
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| 477 | * This may speed up certain requests, especially with large cards. |
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| 478 | * |
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| 479 | * @param mixed $addressBookId |
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| 480 | * @return array |
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| 481 | */ |
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| 482 | function getCards($addressBookId) { |
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| 500 | |||
| 501 | /** |
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| 502 | * Returns a specific card. |
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| 503 | * |
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| 504 | * The same set of properties must be returned as with getCards. The only |
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| 505 | * exception is that 'carddata' is absolutely required. |
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| 506 | * |
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| 507 | * If the card does not exist, you must return false. |
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| 508 | * |
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| 509 | * @param mixed $addressBookId |
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| 510 | * @param string $cardUri |
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| 511 | * @return array |
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| 512 | */ |
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| 513 | function getCard($addressBookId, $cardUri) { |
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| 531 | |||
| 532 | /** |
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| 533 | * Returns a list of cards. |
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| 534 | * |
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| 535 | * This method should work identical to getCard, but instead return all the |
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| 536 | * cards in the list as an array. |
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| 537 | * |
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| 538 | * If the backend supports this, it may allow for some speed-ups. |
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| 539 | * |
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| 540 | * @param mixed $addressBookId |
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| 541 | * @param string[] $uris |
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| 542 | * @return array |
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| 543 | */ |
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| 544 | function getMultipleCards($addressBookId, array $uris) { |
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| 571 | |||
| 572 | /** |
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| 573 | * Creates a new card. |
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| 574 | * |
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| 575 | * The addressbook id will be passed as the first argument. This is the |
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| 576 | * same id as it is returned from the getAddressBooksForUser method. |
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| 577 | * |
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| 578 | * The cardUri is a base uri, and doesn't include the full path. The |
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| 579 | * cardData argument is the vcard body, and is passed as a string. |
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| 580 | * |
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| 581 | * It is possible to return an ETag from this method. This ETag is for the |
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| 582 | * newly created resource, and must be enclosed with double quotes (that |
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| 583 | * is, the string itself must contain the double quotes). |
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| 584 | * |
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| 585 | * You should only return the ETag if you store the carddata as-is. If a |
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| 586 | * subsequent GET request on the same card does not have the same body, |
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| 587 | * byte-by-byte and you did return an ETag here, clients tend to get |
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| 588 | * confused. |
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| 589 | * |
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| 590 | * If you don't return an ETag, you can just return null. |
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| 591 | * |
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| 592 | * @param mixed $addressBookId |
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| 593 | * @param string $cardUri |
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| 594 | * @param string $cardData |
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| 595 | * @return string |
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| 596 | */ |
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| 597 | function createCard($addressBookId, $cardUri, $cardData) { |
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| 625 | |||
| 626 | /** |
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| 627 | * Updates a card. |
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| 628 | * |
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| 629 | * The addressbook id will be passed as the first argument. This is the |
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| 630 | * same id as it is returned from the getAddressBooksForUser method. |
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| 631 | * |
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| 632 | * The cardUri is a base uri, and doesn't include the full path. The |
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| 633 | * cardData argument is the vcard body, and is passed as a string. |
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| 634 | * |
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| 635 | * It is possible to return an ETag from this method. This ETag should |
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| 636 | * match that of the updated resource, and must be enclosed with double |
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| 637 | * quotes (that is: the string itself must contain the actual quotes). |
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| 638 | * |
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| 639 | * You should only return the ETag if you store the carddata as-is. If a |
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| 640 | * subsequent GET request on the same card does not have the same body, |
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| 641 | * byte-by-byte and you did return an ETag here, clients tend to get |
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| 642 | * confused. |
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| 643 | * |
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| 644 | * If you don't return an ETag, you can just return null. |
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| 645 | * |
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| 646 | * @param mixed $addressBookId |
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| 647 | * @param string $cardUri |
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| 648 | * @param string $cardData |
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| 649 | * @return string |
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| 650 | */ |
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| 651 | function updateCard($addressBookId, $cardUri, $cardData) { |
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| 677 | |||
| 678 | /** |
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| 679 | * Deletes a card |
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| 680 | * |
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| 681 | * @param mixed $addressBookId |
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| 682 | * @param string $cardUri |
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| 683 | * @return bool |
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| 684 | */ |
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| 685 | function deleteCard($addressBookId, $cardUri) { |
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| 715 | |||
| 716 | /** |
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| 717 | * The getChanges method returns all the changes that have happened, since |
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| 718 | * the specified syncToken in the specified address book. |
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| 719 | * |
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| 720 | * This function should return an array, such as the following: |
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| 721 | * |
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| 722 | * [ |
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| 723 | * 'syncToken' => 'The current synctoken', |
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| 724 | * 'added' => [ |
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| 725 | * 'new.txt', |
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| 726 | * ], |
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| 727 | * 'modified' => [ |
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| 728 | * 'modified.txt', |
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| 729 | * ], |
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| 730 | * 'deleted' => [ |
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| 731 | * 'foo.php.bak', |
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| 732 | * 'old.txt' |
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| 733 | * ] |
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| 734 | * ]; |
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| 735 | * |
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| 736 | * The returned syncToken property should reflect the *current* syncToken |
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| 737 | * of the calendar, as reported in the {http://sabredav.org/ns}sync-token |
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| 738 | * property. This is needed here too, to ensure the operation is atomic. |
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| 739 | * |
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| 740 | * If the $syncToken argument is specified as null, this is an initial |
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| 741 | * sync, and all members should be reported. |
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| 742 | * |
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| 743 | * The modified property is an array of nodenames that have changed since |
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| 744 | * the last token. |
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| 745 | * |
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| 746 | * The deleted property is an array with nodenames, that have been deleted |
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| 747 | * from collection. |
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| 748 | * |
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| 749 | * The $syncLevel argument is basically the 'depth' of the report. If it's |
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| 750 | * 1, you only have to report changes that happened only directly in |
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| 751 | * immediate descendants. If it's 2, it should also include changes from |
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| 752 | * the nodes below the child collections. (grandchildren) |
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| 753 | * |
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| 754 | * The $limit argument allows a client to specify how many results should |
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| 755 | * be returned at most. If the limit is not specified, it should be treated |
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| 756 | * as infinite. |
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| 757 | * |
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| 758 | * If the limit (infinite or not) is higher than you're willing to return, |
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| 759 | * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception. |
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| 760 | * |
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| 761 | * If the syncToken is expired (due to data cleanup) or unknown, you must |
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| 762 | * return null. |
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| 763 | * |
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| 764 | * The limit is 'suggestive'. You are free to ignore it. |
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| 765 | * |
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| 766 | * @param string $addressBookId |
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| 767 | * @param string $syncToken |
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| 768 | * @param int $syncLevel |
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| 769 | * @param int $limit |
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| 770 | * @return array |
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| 771 | */ |
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| 772 | View Code Duplication | function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null) { |
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| 833 | |||
| 834 | /** |
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| 835 | * Adds a change record to the addressbookchanges table. |
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| 836 | * |
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| 837 | * @param mixed $addressBookId |
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| 838 | * @param string $objectUri |
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| 839 | * @param int $operation 1 = add, 2 = modify, 3 = delete |
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| 840 | * @return void |
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| 841 | */ |
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| 842 | View Code Duplication | protected function addChange($addressBookId, $objectUri, $operation) { |
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| 856 | |||
| 857 | private function readBlob($cardData) { |
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| 864 | |||
| 865 | /** |
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| 866 | * @param IShareable $shareable |
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| 867 | * @param string[] $add |
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| 868 | * @param string[] $remove |
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| 869 | */ |
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| 870 | public function updateShares(IShareable $shareable, $add, $remove) { |
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| 873 | |||
| 874 | /** |
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| 875 | * search contact |
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| 876 | * |
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| 877 | * @param int $addressBookId |
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| 878 | * @param string $pattern which should match within the $searchProperties |
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| 879 | * @param array $searchProperties defines the properties within the query pattern should match |
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| 880 | * @return array an array of contacts which are arrays of key-value-pairs |
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| 881 | */ |
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| 882 | public function search($addressBookId, $pattern, $searchProperties) { |
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| 909 | |||
| 910 | /** |
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| 911 | * @param int $bookId |
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| 912 | * @param string $name |
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| 913 | * @return array |
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| 914 | */ |
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| 915 | public function collectCardProperties($bookId, $name) { |
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| 928 | |||
| 929 | /** |
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| 930 | * get URI from a given contact |
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| 931 | * |
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| 932 | * @param int $id |
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| 933 | * @return string |
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| 934 | */ |
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| 935 | public function getCardUri($id) { |
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| 951 | |||
| 952 | /** |
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| 953 | * return contact with the given URI |
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| 954 | * |
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| 955 | * @param int $addressBookId |
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| 956 | * @param string $uri |
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| 957 | * @returns array |
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| 958 | */ |
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| 959 | public function getContact($addressBookId, $uri) { |
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| 975 | |||
| 976 | /** |
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| 977 | * Returns the list of people whom this address book is shared with. |
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| 978 | * |
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| 979 | * Every element in this array should have the following properties: |
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| 980 | * * href - Often a mailto: address |
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| 981 | * * commonName - Optional, for example a first + last name |
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| 982 | * * status - See the Sabre\CalDAV\SharingPlugin::STATUS_ constants. |
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| 983 | * * readOnly - boolean |
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| 984 | * * summary - Optional, a description for the share |
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| 985 | * |
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| 986 | * @return array |
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| 987 | */ |
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| 988 | public function getShares($addressBookId) { |
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| 991 | |||
| 992 | /** |
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| 993 | * update properties table |
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| 994 | * |
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| 995 | * @param int $addressBookId |
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| 996 | * @param string $cardUri |
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| 997 | * @param string $vCardSerialized |
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| 998 | */ |
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| 999 | protected function updateProperties($addressBookId, $cardUri, $vCardSerialized) { |
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| 1034 | |||
| 1035 | /** |
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| 1036 | * read vCard data into a vCard object |
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| 1037 | * |
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| 1038 | * @param string $cardData |
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| 1039 | * @return VCard |
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| 1040 | */ |
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| 1041 | protected function readCard($cardData) { |
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| 1044 | |||
| 1045 | /** |
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| 1046 | * delete all properties from a given card |
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| 1047 | * |
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| 1048 | * @param int $addressBookId |
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| 1049 | * @param int $cardId |
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| 1050 | */ |
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| 1051 | protected function purgeProperties($addressBookId, $cardId) { |
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| 1058 | |||
| 1059 | /** |
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| 1060 | * get ID from a given contact |
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| 1061 | * |
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| 1062 | * @param int $addressBookId |
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| 1063 | * @param string $uri |
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| 1064 | * @return int |
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| 1065 | */ |
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| 1066 | protected function getCardId($addressBookId, $uri) { |
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| 1082 | |||
| 1083 | /** |
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| 1084 | * For shared address books the sharee is set in the ACL of the address book |
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| 1085 | * @param $addressBookId |
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| 1086 | * @param $acl |
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| 1087 | * @return array |
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| 1088 | */ |
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| 1089 | public function applyShareAcl($addressBookId, $acl) { |
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| 1092 | |||
| 1093 | View Code Duplication | private function convertPrincipal($principalUri, $toV2) { |
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| 1103 | |||
| 1104 | View Code Duplication | private function addOwnerPrincipal(&$addressbookInfo) { |
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| 1118 | } |
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| 1119 |
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Let’s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let’s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: