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Commit | Line | Data |
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ca74886f | 1 | <?php |
f3d2f257 | 2 | |
f24896b2 V |
3 | namespace Shaarli\Bookmark; |
4 | ||
5 | use ArrayAccess; | |
6 | use Countable; | |
7 | use DateTime; | |
8 | use Iterator; | |
6696729b | 9 | use Shaarli\Bookmark\Exception\LinkNotFoundException; |
f3d2f257 | 10 | use Shaarli\Exceptions\IOException; |
a0c4dbd9 | 11 | use Shaarli\FileUtils; |
f3d2f257 | 12 | |
ca74886f V |
13 | /** |
14 | * Data storage for links. | |
15 | * | |
16 | * This object behaves like an associative array. | |
17 | * | |
18 | * Example: | |
19 | * $myLinks = new LinkDB(); | |
29d10882 | 20 | * echo $myLinks[350]['title']; |
ca74886f V |
21 | * foreach ($myLinks as $link) |
22 | * echo $link['title'].' at url '.$link['url'].'; description:'.$link['description']; | |
23 | * | |
24 | * Available keys: | |
29d10882 | 25 | * - id: primary key, incremental integer identifier (persistent) |
ca74886f | 26 | * - description: description of the entry |
29d10882 A |
27 | * - created: creation date of this entry, DateTime object. |
28 | * - updated: last modification date of this entry, DateTime object. | |
ca74886f V |
29 | * - private: Is this link private? 0=no, other value=yes |
30 | * - tags: tags attached to this entry (separated by spaces) | |
31 | * - title Title of the link | |
520d2957 A |
32 | * - url URL of the link. Used for displayable links. |
33 | * Can be absolute or relative in the database but the relative links | |
34 | * will be converted to absolute ones in templates. | |
35 | * - real_url Raw URL in stored in the DB (absolute or relative). | |
d592daea | 36 | * - shorturl Permalink smallhash |
ca74886f V |
37 | * |
38 | * Implements 3 interfaces: | |
39 | * - ArrayAccess: behaves like an associative array; | |
40 | * - Countable: there is a count() method; | |
41 | * - Iterator: usable in foreach () loops. | |
29d10882 A |
42 | * |
43 | * ID mechanism: | |
44 | * ArrayAccess is implemented in a way that will allow to access a link | |
45 | * with the unique identifier ID directly with $link[ID]. | |
46 | * Note that it's not the real key of the link array attribute. | |
47 | * This mechanism is in place to have persistent link IDs, | |
48 | * even though the internal array is reordered by date. | |
49 | * Example: | |
50 | * - DB: link #1 (2010-01-01) link #2 (2016-01-01) | |
51 | * - Order: #2 #1 | |
52 | * - Import links containing: link #3 (2013-01-01) | |
53 | * - New DB: link #1 (2010-01-01) link #2 (2016-01-01) link #3 (2013-01-01) | |
54 | * - Real order: #2 #3 #1 | |
ca74886f V |
55 | */ |
56 | class LinkDB implements Iterator, Countable, ArrayAccess | |
57 | { | |
9c8752a2 | 58 | // Links are stored as a PHP serialized string |
628b97cb | 59 | private $datastore; |
9c8752a2 | 60 | |
205a4277 V |
61 | // Link date storage format |
62 | const LINK_DATE_FORMAT = 'Ymd_His'; | |
63 | ||
ca74886f V |
64 | // List of links (associative array) |
65 | // - key: link date (e.g. "20110823_124546"), | |
66 | // - value: associative array (keys: title, description...) | |
628b97cb | 67 | private $links; |
ca74886f | 68 | |
29d10882 A |
69 | // List of all recorded URLs (key=url, value=link offset) |
70 | // for fast reserve search (url-->link offset) | |
628b97cb | 71 | private $urls; |
ca74886f | 72 | |
29d10882 A |
73 | /** |
74 | * @var array List of all links IDS mapped with their array offset. | |
75 | * Map: id->offset. | |
76 | */ | |
77 | protected $ids; | |
78 | ||
79 | // List of offset keys (for the Iterator interface implementation) | |
628b97cb | 80 | private $keys; |
ca74886f | 81 | |
628b97cb V |
82 | // Position in the $this->keys array (for the Iterator interface) |
83 | private $position; | |
ca74886f V |
84 | |
85 | // Is the user logged in? (used to filter private links) | |
628b97cb | 86 | private $loggedIn; |
ca74886f | 87 | |
9f15ca9e | 88 | // Hide public links |
628b97cb | 89 | private $hidePublicLinks; |
9f15ca9e | 90 | |
ca74886f V |
91 | /** |
92 | * Creates a new LinkDB | |
93 | * | |
94 | * Checks if the datastore exists; else, attempts to create a dummy one. | |
95 | * | |
6696729b V |
96 | * @param string $datastore datastore file path. |
97 | * @param boolean $isLoggedIn is the user logged in? | |
98 | * @param boolean $hidePublicLinks if true all links are private. | |
ca74886f | 99 | */ |
735ed4a9 | 100 | public function __construct( |
043eae70 A |
101 | $datastore, |
102 | $isLoggedIn, | |
520d2957 | 103 | $hidePublicLinks |
f211e417 | 104 | ) { |
f24896b2 | 105 | |
628b97cb V |
106 | $this->datastore = $datastore; |
107 | $this->loggedIn = $isLoggedIn; | |
108 | $this->hidePublicLinks = $hidePublicLinks; | |
f21abf32 V |
109 | $this->check(); |
110 | $this->read(); | |
ca74886f V |
111 | } |
112 | ||
113 | /** | |
114 | * Countable - Counts elements of an object | |
115 | */ | |
116 | public function count() | |
117 | { | |
628b97cb | 118 | return count($this->links); |
ca74886f V |
119 | } |
120 | ||
121 | /** | |
122 | * ArrayAccess - Assigns a value to the specified offset | |
123 | */ | |
124 | public function offsetSet($offset, $value) | |
125 | { | |
126 | // TODO: use exceptions instead of "die" | |
628b97cb | 127 | if (!$this->loggedIn) { |
12266213 | 128 | die(t('You are not authorized to add a link.')); |
ca74886f | 129 | } |
29d10882 | 130 | if (!isset($value['id']) || empty($value['url'])) { |
12266213 | 131 | die(t('Internal Error: A link should always have an id and URL.')); |
ca74886f | 132 | } |
f24896b2 | 133 | if (($offset !== null && !is_int($offset)) || !is_int($value['id'])) { |
12266213 | 134 | die(t('You must specify an integer as a key.')); |
29d10882 | 135 | } |
bc5f1597 | 136 | if ($offset !== null && $offset !== $value['id']) { |
12266213 | 137 | die(t('Array offset and link ID must be equal.')); |
29d10882 A |
138 | } |
139 | ||
140 | // If the link exists, we reuse the real offset, otherwise new entry | |
141 | $existing = $this->getLinkOffset($offset); | |
142 | if ($existing !== null) { | |
143 | $offset = $existing; | |
144 | } else { | |
145 | $offset = count($this->links); | |
ca74886f | 146 | } |
628b97cb | 147 | $this->links[$offset] = $value; |
29d10882 A |
148 | $this->urls[$value['url']] = $offset; |
149 | $this->ids[$value['id']] = $offset; | |
ca74886f V |
150 | } |
151 | ||
152 | /** | |
153 | * ArrayAccess - Whether or not an offset exists | |
154 | */ | |
155 | public function offsetExists($offset) | |
156 | { | |
29d10882 | 157 | return array_key_exists($this->getLinkOffset($offset), $this->links); |
ca74886f V |
158 | } |
159 | ||
160 | /** | |
161 | * ArrayAccess - Unsets an offset | |
162 | */ | |
163 | public function offsetUnset($offset) | |
164 | { | |
628b97cb | 165 | if (!$this->loggedIn) { |
ca74886f V |
166 | // TODO: raise an exception |
167 | die('You are not authorized to delete a link.'); | |
168 | } | |
29d10882 A |
169 | $realOffset = $this->getLinkOffset($offset); |
170 | $url = $this->links[$realOffset]['url']; | |
628b97cb | 171 | unset($this->urls[$url]); |
29d10882 A |
172 | unset($this->ids[$realOffset]); |
173 | unset($this->links[$realOffset]); | |
ca74886f V |
174 | } |
175 | ||
176 | /** | |
177 | * ArrayAccess - Returns the value at specified offset | |
178 | */ | |
179 | public function offsetGet($offset) | |
180 | { | |
29d10882 A |
181 | $realOffset = $this->getLinkOffset($offset); |
182 | return isset($this->links[$realOffset]) ? $this->links[$realOffset] : null; | |
ca74886f V |
183 | } |
184 | ||
185 | /** | |
186 | * Iterator - Returns the current element | |
187 | */ | |
735ed4a9 | 188 | public function current() |
ca74886f | 189 | { |
29d10882 | 190 | return $this[$this->keys[$this->position]]; |
ca74886f V |
191 | } |
192 | ||
193 | /** | |
194 | * Iterator - Returns the key of the current element | |
195 | */ | |
735ed4a9 | 196 | public function key() |
ca74886f | 197 | { |
628b97cb | 198 | return $this->keys[$this->position]; |
ca74886f V |
199 | } |
200 | ||
201 | /** | |
202 | * Iterator - Moves forward to next element | |
203 | */ | |
735ed4a9 | 204 | public function next() |
ca74886f | 205 | { |
628b97cb | 206 | ++$this->position; |
ca74886f V |
207 | } |
208 | ||
209 | /** | |
210 | * Iterator - Rewinds the Iterator to the first element | |
211 | * | |
212 | * Entries are sorted by date (latest first) | |
213 | */ | |
735ed4a9 | 214 | public function rewind() |
ca74886f | 215 | { |
29d10882 | 216 | $this->keys = array_keys($this->ids); |
628b97cb | 217 | $this->position = 0; |
ca74886f V |
218 | } |
219 | ||
220 | /** | |
221 | * Iterator - Checks if current position is valid | |
222 | */ | |
735ed4a9 | 223 | public function valid() |
ca74886f | 224 | { |
628b97cb | 225 | return isset($this->keys[$this->position]); |
ca74886f V |
226 | } |
227 | ||
228 | /** | |
229 | * Checks if the DB directory and file exist | |
230 | * | |
231 | * If no DB file is found, creates a dummy DB. | |
232 | */ | |
f21abf32 | 233 | private function check() |
ca74886f | 234 | { |
628b97cb | 235 | if (file_exists($this->datastore)) { |
ca74886f V |
236 | return; |
237 | } | |
238 | ||
239 | // Create a dummy database for example | |
628b97cb | 240 | $this->links = array(); |
ca74886f | 241 | $link = array( |
29d10882 | 242 | 'id' => 1, |
f24896b2 V |
243 | 'title' => t('The personal, minimalist, super-fast, database free, bookmarking service'), |
244 | 'url' => 'https://shaarli.readthedocs.io', | |
245 | 'description' => t( | |
9d9f6d75 | 246 | 'Welcome to Shaarli! This is your first public bookmark. ' |
f24896b2 | 247 | . 'To edit or delete me, you must first login. |
598376d4 | 248 | |
12266213 | 249 | To learn how to use Shaarli, consult the link "Documentation" at the bottom of this page. |
598376d4 | 250 | |
9d9f6d75 V |
251 | You use the community supported version of the original Shaarli project, by Sebastien Sauvage.' |
252 | ), | |
f24896b2 V |
253 | 'private' => 0, |
254 | 'created' => new DateTime(), | |
255 | 'tags' => 'opensource software' | |
ca74886f | 256 | ); |
d592daea | 257 | $link['shorturl'] = link_small_hash($link['created'], $link['id']); |
29d10882 | 258 | $this->links[1] = $link; |
ca74886f V |
259 | |
260 | $link = array( | |
29d10882 | 261 | 'id' => 0, |
f24896b2 V |
262 | 'title' => t('My secret stuff... - Pastebin.com'), |
263 | 'url' => 'http://sebsauvage.net/paste/?8434b27936c09649#bR7XsXhoTiLcqCpQbmOpBi3rq2zzQUC5hBI7ZT1O3x8=', | |
264 | 'description' => t('Shhhh! I\'m a private link only YOU can see. You can delete me too.'), | |
265 | 'private' => 1, | |
266 | 'created' => new DateTime('1 minute ago'), | |
267 | 'tags' => 'secretstuff', | |
ca74886f | 268 | ); |
d592daea | 269 | $link['shorturl'] = link_small_hash($link['created'], $link['id']); |
29d10882 | 270 | $this->links[0] = $link; |
ca74886f V |
271 | |
272 | // Write database to disk | |
f21abf32 | 273 | $this->write(); |
ca74886f V |
274 | } |
275 | ||
276 | /** | |
277 | * Reads database from disk to memory | |
278 | */ | |
f21abf32 | 279 | private function read() |
ca74886f | 280 | { |
578a84bd | 281 | // Public links are hidden and user not logged in => nothing to show |
628b97cb V |
282 | if ($this->hidePublicLinks && !$this->loggedIn) { |
283 | $this->links = array(); | |
578a84bd | 284 | return; |
285 | } | |
286 | ||
9ec0a611 A |
287 | $this->urls = []; |
288 | $this->ids = []; | |
b2306b0c | 289 | $this->links = FileUtils::readFlatDB($this->datastore, []); |
ca74886f | 290 | |
29d10882 A |
291 | $toremove = array(); |
292 | foreach ($this->links as $key => &$link) { | |
f24896b2 | 293 | if (!$this->loggedIn && $link['private'] != 0) { |
29d10882 | 294 | // Transition for not upgraded databases. |
9ec0a611 | 295 | unset($this->links[$key]); |
29d10882 | 296 | continue; |
ca74886f | 297 | } |
195acf9f | 298 | |
510377d2 | 299 | // Sanitize data fields. |
90e5bd65 | 300 | sanitizeLink($link); |
195acf9f A |
301 | |
302 | // Remove private tags if the user is not logged in. | |
f24896b2 | 303 | if (!$this->loggedIn) { |
9866b408 | 304 | $link['tags'] = preg_replace('/(^|\s+)\.[^($|\s)]+\s*/', ' ', $link['tags']); |
195acf9f A |
305 | } |
306 | ||
520d2957 | 307 | $link['real_url'] = $link['url']; |
29d10882 A |
308 | |
309 | // To be able to load links before running the update, and prepare the update | |
f24896b2 | 310 | if (!isset($link['created'])) { |
29d10882 | 311 | $link['id'] = $link['linkdate']; |
d592daea | 312 | $link['created'] = DateTime::createFromFormat(self::LINK_DATE_FORMAT, $link['linkdate']); |
f24896b2 | 313 | if (!empty($link['updated'])) { |
d592daea | 314 | $link['updated'] = DateTime::createFromFormat(self::LINK_DATE_FORMAT, $link['updated']); |
29d10882 | 315 | } |
d592daea | 316 | $link['shorturl'] = smallHash($link['linkdate']); |
29d10882 | 317 | } |
29d10882 | 318 | |
9ec0a611 A |
319 | $this->urls[$link['url']] = $key; |
320 | $this->ids[$link['id']] = $key; | |
5f85fcd8 | 321 | } |
ca74886f V |
322 | } |
323 | ||
2e28269b V |
324 | /** |
325 | * Saves the database from memory to disk | |
326 | * | |
327 | * @throws IOException the datastore is not writable | |
328 | */ | |
f21abf32 | 329 | private function write() |
2e28269b | 330 | { |
9ec0a611 | 331 | $this->reorder(); |
b2306b0c | 332 | FileUtils::writeFlatDB($this->datastore, $this->links); |
2e28269b V |
333 | } |
334 | ||
ca74886f V |
335 | /** |
336 | * Saves the database from memory to disk | |
01e48f26 V |
337 | * |
338 | * @param string $pageCacheDir page cache directory | |
ca74886f | 339 | */ |
f21abf32 | 340 | public function save($pageCacheDir) |
ca74886f | 341 | { |
628b97cb | 342 | if (!$this->loggedIn) { |
ca74886f V |
343 | // TODO: raise an Exception instead |
344 | die('You are not authorized to change the database.'); | |
345 | } | |
2e28269b | 346 | |
f21abf32 | 347 | $this->write(); |
2e28269b | 348 | |
01e48f26 | 349 | invalidateCaches($pageCacheDir); |
ca74886f V |
350 | } |
351 | ||
352 | /** | |
353 | * Returns the link for a given URL, or False if it does not exist. | |
ef591e7e GV |
354 | * |
355 | * @param string $url URL to search for | |
356 | * | |
357 | * @return mixed the existing link if it exists, else 'false' | |
ca74886f V |
358 | */ |
359 | public function getLinkFromUrl($url) | |
360 | { | |
628b97cb V |
361 | if (isset($this->urls[$url])) { |
362 | return $this->links[$this->urls[$url]]; | |
ca74886f V |
363 | } |
364 | return false; | |
365 | } | |
366 | ||
367 | /** | |
528a6f8a | 368 | * Returns the shaare corresponding to a smallHash. |
ca74886f | 369 | * |
528a6f8a A |
370 | * @param string $request QUERY_STRING server parameter. |
371 | * | |
372 | * @return array $filtered array containing permalink data. | |
373 | * | |
374 | * @throws LinkNotFoundException if the smallhash is malformed or doesn't match any link. | |
375 | */ | |
376 | public function filterHash($request) | |
377 | { | |
378 | $request = substr($request, 0, 6); | |
628b97cb | 379 | $linkFilter = new LinkFilter($this->links); |
528a6f8a A |
380 | return $linkFilter->filter(LinkFilter::$FILTER_HASH, $request); |
381 | } | |
382 | ||
383 | /** | |
384 | * Returns the list of articles for a given day. | |
385 | * | |
386 | * @param string $request day to filter. Format: YYYYMMDD. | |
387 | * | |
388 | * @return array list of shaare found. | |
389 | */ | |
f211e417 V |
390 | public function filterDay($request) |
391 | { | |
628b97cb | 392 | $linkFilter = new LinkFilter($this->links); |
528a6f8a A |
393 | return $linkFilter->filter(LinkFilter::$FILTER_DAY, $request); |
394 | } | |
395 | ||
396 | /** | |
397 | * Filter links according to search parameters. | |
398 | * | |
6696729b | 399 | * @param array $filterRequest Search request content. Supported keys: |
528a6f8a A |
400 | * - searchtags: list of tags |
401 | * - searchterm: term search | |
6696729b V |
402 | * @param bool $casesensitive Optional: Perform case sensitive filter |
403 | * @param string $visibility return only all/private/public links | |
404 | * @param bool $untaggedonly return only untagged links | |
ca74886f | 405 | * |
528a6f8a | 406 | * @return array filtered links, all links if no suitable filter was provided. |
ca74886f | 407 | */ |
9d9f6d75 V |
408 | public function filterSearch( |
409 | $filterRequest = array(), | |
410 | $casesensitive = false, | |
411 | $visibility = 'all', | |
412 | $untaggedonly = false | |
413 | ) { | |
f24896b2 | 414 | |
528a6f8a | 415 | // Filter link database according to parameters. |
7d86f40b A |
416 | $searchtags = isset($filterRequest['searchtags']) ? escape($filterRequest['searchtags']) : ''; |
417 | $searchterm = isset($filterRequest['searchterm']) ? escape($filterRequest['searchterm']) : ''; | |
528a6f8a | 418 | |
7d86f40b | 419 | // Search tags + fullsearch - blank string parameter will return all links. |
f210d94f | 420 | $type = LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT; // == "vuotext" |
7d86f40b | 421 | $request = [$searchtags, $searchterm]; |
528a6f8a | 422 | |
29d10882 | 423 | $linkFilter = new LinkFilter($this); |
f210d94f | 424 | return $linkFilter->filter($type, $request, $casesensitive, $visibility, $untaggedonly); |
ca74886f V |
425 | } |
426 | ||
427 | /** | |
6ccd0b21 | 428 | * Returns the list tags appearing in the links with the given tags |
f8c5660d | 429 | * |
6696729b V |
430 | * @param array $filteringTags tags selecting the links to consider |
431 | * @param string $visibility process only all/private/public links | |
f8c5660d A |
432 | * |
433 | * @return array tag => linksCount | |
ca74886f | 434 | */ |
6ccd0b21 | 435 | public function linksCountPerTag($filteringTags = [], $visibility = 'all') |
ca74886f | 436 | { |
f8c5660d A |
437 | $links = $this->filterSearch(['searchtags' => $filteringTags], false, $visibility); |
438 | $tags = []; | |
439 | $caseMapping = []; | |
6ccd0b21 | 440 | foreach ($links as $link) { |
4b35853d | 441 | foreach (preg_split('/\s+/', $link['tags'], 0, PREG_SPLIT_NO_EMPTY) as $tag) { |
b1eb5d1d A |
442 | if (empty($tag)) { |
443 | continue; | |
ca74886f | 444 | } |
b1eb5d1d A |
445 | // The first case found will be displayed. |
446 | if (!isset($caseMapping[strtolower($tag)])) { | |
447 | $caseMapping[strtolower($tag)] = $tag; | |
448 | $tags[$caseMapping[strtolower($tag)]] = 0; | |
449 | } | |
450 | $tags[$caseMapping[strtolower($tag)]]++; | |
ca74886f V |
451 | } |
452 | } | |
f8c5660d A |
453 | |
454 | /* | |
455 | * Formerly used arsort(), which doesn't define the sort behaviour for equal values. | |
456 | * Also, this function doesn't produce the same result between PHP 5.6 and 7. | |
457 | * | |
458 | * So we now use array_multisort() to sort tags by DESC occurrences, | |
459 | * then ASC alphabetically for equal values. | |
460 | * | |
461 | * @see https://github.com/shaarli/Shaarli/issues/1142 | |
462 | */ | |
f28396a2 A |
463 | $keys = array_keys($tags); |
464 | $tmpTags = array_combine($keys, $keys); | |
f28396a2 | 465 | array_multisort($tags, SORT_DESC, $tmpTags, SORT_ASC, $tags); |
ca74886f V |
466 | return $tags; |
467 | } | |
468 | ||
3b67b222 A |
469 | /** |
470 | * Rename or delete a tag across all links. | |
471 | * | |
472 | * @param string $from Tag to rename | |
6696729b | 473 | * @param string $to New tag. If none is provided, the from tag will be deleted |
3b67b222 A |
474 | * |
475 | * @return array|bool List of altered links or false on error | |
476 | */ | |
477 | public function renameTag($from, $to) | |
478 | { | |
479 | if (empty($from)) { | |
480 | return false; | |
481 | } | |
482 | $delete = empty($to); | |
483 | // True for case-sensitive tag search. | |
484 | $linksToAlter = $this->filterSearch(['searchtags' => $from], true); | |
f211e417 | 485 | foreach ($linksToAlter as $key => &$value) { |
3b67b222 A |
486 | $tags = preg_split('/\s+/', trim($value['tags'])); |
487 | if (($pos = array_search($from, $tags)) !== false) { | |
488 | if ($delete) { | |
489 | unset($tags[$pos]); // Remove tag. | |
490 | } else { | |
491 | $tags[$pos] = trim($to); | |
492 | } | |
493 | $value['tags'] = trim(implode(' ', array_unique($tags))); | |
494 | $this[$value['id']] = $value; | |
495 | } | |
496 | } | |
497 | ||
498 | return $linksToAlter; | |
499 | } | |
500 | ||
ca74886f V |
501 | /** |
502 | * Returns the list of days containing articles (oldest first) | |
503 | * Output: An array containing days (in format YYYYMMDD). | |
504 | */ | |
505 | public function days() | |
506 | { | |
507 | $linkDays = array(); | |
29d10882 A |
508 | foreach ($this->links as $link) { |
509 | $linkDays[$link['created']->format('Ymd')] = 0; | |
ca74886f V |
510 | } |
511 | $linkDays = array_keys($linkDays); | |
512 | sort($linkDays); | |
510377d2 | 513 | |
ca74886f V |
514 | return $linkDays; |
515 | } | |
29d10882 A |
516 | |
517 | /** | |
518 | * Reorder links by creation date (newest first). | |
519 | * | |
520 | * Also update the urls and ids mapping arrays. | |
521 | * | |
522 | * @param string $order ASC|DESC | |
523 | */ | |
524 | public function reorder($order = 'DESC') | |
525 | { | |
526 | $order = $order === 'ASC' ? -1 : 1; | |
527 | // Reorder array by dates. | |
f211e417 | 528 | usort($this->links, function ($a, $b) use ($order) { |
4154c25b A |
529 | if (isset($a['sticky']) && isset($b['sticky']) && $a['sticky'] !== $b['sticky']) { |
530 | return $a['sticky'] ? -1 : 1; | |
531 | } | |
29d10882 A |
532 | return $a['created'] < $b['created'] ? 1 * $order : -1 * $order; |
533 | }); | |
534 | ||
9ec0a611 A |
535 | $this->urls = []; |
536 | $this->ids = []; | |
29d10882 A |
537 | foreach ($this->links as $key => $link) { |
538 | $this->urls[$link['url']] = $key; | |
539 | $this->ids[$link['id']] = $key; | |
540 | } | |
541 | } | |
542 | ||
543 | /** | |
544 | * Return the next key for link creation. | |
545 | * E.g. If the last ID is 597, the next will be 598. | |
546 | * | |
547 | * @return int next ID. | |
548 | */ | |
549 | public function getNextId() | |
550 | { | |
551 | if (!empty($this->ids)) { | |
552 | return max(array_keys($this->ids)) + 1; | |
553 | } | |
554 | return 0; | |
555 | } | |
556 | ||
557 | /** | |
558 | * Returns a link offset in links array from its unique ID. | |
559 | * | |
560 | * @param int $id Persistent ID of a link. | |
561 | * | |
d592daea | 562 | * @return int Real offset in local array, or null if doesn't exist. |
29d10882 A |
563 | */ |
564 | protected function getLinkOffset($id) | |
565 | { | |
566 | if (isset($this->ids[$id])) { | |
567 | return $this->ids[$id]; | |
568 | } | |
569 | return null; | |
570 | } | |
ca74886f | 571 | } |