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1 | <?php | |
2 | /** | |
3 | * Data storage for links. | |
4 | * | |
5 | * This object behaves like an associative array. | |
6 | * | |
7 | * Example: | |
8 | * $myLinks = new LinkDB(); | |
9 | * echo $myLinks[350]['title']; | |
10 | * foreach ($myLinks as $link) | |
11 | * echo $link['title'].' at url '.$link['url'].'; description:'.$link['description']; | |
12 | * | |
13 | * Available keys: | |
14 | * - id: primary key, incremental integer identifier (persistent) | |
15 | * - description: description of the entry | |
16 | * - created: creation date of this entry, DateTime object. | |
17 | * - updated: last modification date of this entry, DateTime object. | |
18 | * - private: Is this link private? 0=no, other value=yes | |
19 | * - tags: tags attached to this entry (separated by spaces) | |
20 | * - title Title of the link | |
21 | * - url URL of the link. Used for displayable links (no redirector, relative, etc.). | |
22 | * Can be absolute or relative. | |
23 | * Relative URLs are permalinks (e.g.'?m-ukcw') | |
24 | * - real_url Absolute processed URL. | |
25 | * - shorturl Permalink smallhash | |
26 | * | |
27 | * Implements 3 interfaces: | |
28 | * - ArrayAccess: behaves like an associative array; | |
29 | * - Countable: there is a count() method; | |
30 | * - Iterator: usable in foreach () loops. | |
31 | * | |
32 | * ID mechanism: | |
33 | * ArrayAccess is implemented in a way that will allow to access a link | |
34 | * with the unique identifier ID directly with $link[ID]. | |
35 | * Note that it's not the real key of the link array attribute. | |
36 | * This mechanism is in place to have persistent link IDs, | |
37 | * even though the internal array is reordered by date. | |
38 | * Example: | |
39 | * - DB: link #1 (2010-01-01) link #2 (2016-01-01) | |
40 | * - Order: #2 #1 | |
41 | * - Import links containing: link #3 (2013-01-01) | |
42 | * - New DB: link #1 (2010-01-01) link #2 (2016-01-01) link #3 (2013-01-01) | |
43 | * - Real order: #2 #3 #1 | |
44 | */ | |
45 | class LinkDB implements Iterator, Countable, ArrayAccess | |
46 | { | |
47 | // Links are stored as a PHP serialized string | |
48 | private $datastore; | |
49 | ||
50 | // Link date storage format | |
51 | const LINK_DATE_FORMAT = 'Ymd_His'; | |
52 | ||
53 | // List of links (associative array) | |
54 | // - key: link date (e.g. "20110823_124546"), | |
55 | // - value: associative array (keys: title, description...) | |
56 | private $links; | |
57 | ||
58 | // List of all recorded URLs (key=url, value=link offset) | |
59 | // for fast reserve search (url-->link offset) | |
60 | private $urls; | |
61 | ||
62 | /** | |
63 | * @var array List of all links IDS mapped with their array offset. | |
64 | * Map: id->offset. | |
65 | */ | |
66 | protected $ids; | |
67 | ||
68 | // List of offset keys (for the Iterator interface implementation) | |
69 | private $keys; | |
70 | ||
71 | // Position in the $this->keys array (for the Iterator interface) | |
72 | private $position; | |
73 | ||
74 | // Is the user logged in? (used to filter private links) | |
75 | private $loggedIn; | |
76 | ||
77 | // Hide public links | |
78 | private $hidePublicLinks; | |
79 | ||
80 | // link redirector set in user settings. | |
81 | private $redirector; | |
82 | ||
83 | /** | |
84 | * Set this to `true` to urlencode link behind redirector link, `false` to leave it untouched. | |
85 | * | |
86 | * Example: | |
87 | * anonym.to needs clean URL while dereferer.org needs urlencoded URL. | |
88 | * | |
89 | * @var boolean $redirectorEncode parameter: true or false | |
90 | */ | |
91 | private $redirectorEncode; | |
92 | ||
93 | /** | |
94 | * Creates a new LinkDB | |
95 | * | |
96 | * Checks if the datastore exists; else, attempts to create a dummy one. | |
97 | * | |
98 | * @param string $datastore datastore file path. | |
99 | * @param boolean $isLoggedIn is the user logged in? | |
100 | * @param boolean $hidePublicLinks if true all links are private. | |
101 | * @param string $redirector link redirector set in user settings. | |
102 | * @param boolean $redirectorEncode Enable urlencode on redirected urls (default: true). | |
103 | */ | |
104 | public function __construct( | |
105 | $datastore, | |
106 | $isLoggedIn, | |
107 | $hidePublicLinks, | |
108 | $redirector = '', | |
109 | $redirectorEncode = true | |
110 | ) { | |
111 | $this->datastore = $datastore; | |
112 | $this->loggedIn = $isLoggedIn; | |
113 | $this->hidePublicLinks = $hidePublicLinks; | |
114 | $this->redirector = $redirector; | |
115 | $this->redirectorEncode = $redirectorEncode === true; | |
116 | $this->check(); | |
117 | $this->read(); | |
118 | } | |
119 | ||
120 | /** | |
121 | * Countable - Counts elements of an object | |
122 | */ | |
123 | public function count() | |
124 | { | |
125 | return count($this->links); | |
126 | } | |
127 | ||
128 | /** | |
129 | * ArrayAccess - Assigns a value to the specified offset | |
130 | */ | |
131 | public function offsetSet($offset, $value) | |
132 | { | |
133 | // TODO: use exceptions instead of "die" | |
134 | if (!$this->loggedIn) { | |
135 | die(t('You are not authorized to add a link.')); | |
136 | } | |
137 | if (!isset($value['id']) || empty($value['url'])) { | |
138 | die(t('Internal Error: A link should always have an id and URL.')); | |
139 | } | |
140 | if (($offset !== null && ! is_int($offset)) || ! is_int($value['id'])) { | |
141 | die(t('You must specify an integer as a key.')); | |
142 | } | |
143 | if ($offset !== null && $offset !== $value['id']) { | |
144 | die(t('Array offset and link ID must be equal.')); | |
145 | } | |
146 | ||
147 | // If the link exists, we reuse the real offset, otherwise new entry | |
148 | $existing = $this->getLinkOffset($offset); | |
149 | if ($existing !== null) { | |
150 | $offset = $existing; | |
151 | } else { | |
152 | $offset = count($this->links); | |
153 | } | |
154 | $this->links[$offset] = $value; | |
155 | $this->urls[$value['url']] = $offset; | |
156 | $this->ids[$value['id']] = $offset; | |
157 | } | |
158 | ||
159 | /** | |
160 | * ArrayAccess - Whether or not an offset exists | |
161 | */ | |
162 | public function offsetExists($offset) | |
163 | { | |
164 | return array_key_exists($this->getLinkOffset($offset), $this->links); | |
165 | } | |
166 | ||
167 | /** | |
168 | * ArrayAccess - Unsets an offset | |
169 | */ | |
170 | public function offsetUnset($offset) | |
171 | { | |
172 | if (!$this->loggedIn) { | |
173 | // TODO: raise an exception | |
174 | die('You are not authorized to delete a link.'); | |
175 | } | |
176 | $realOffset = $this->getLinkOffset($offset); | |
177 | $url = $this->links[$realOffset]['url']; | |
178 | unset($this->urls[$url]); | |
179 | unset($this->ids[$realOffset]); | |
180 | unset($this->links[$realOffset]); | |
181 | } | |
182 | ||
183 | /** | |
184 | * ArrayAccess - Returns the value at specified offset | |
185 | */ | |
186 | public function offsetGet($offset) | |
187 | { | |
188 | $realOffset = $this->getLinkOffset($offset); | |
189 | return isset($this->links[$realOffset]) ? $this->links[$realOffset] : null; | |
190 | } | |
191 | ||
192 | /** | |
193 | * Iterator - Returns the current element | |
194 | */ | |
195 | public function current() | |
196 | { | |
197 | return $this[$this->keys[$this->position]]; | |
198 | } | |
199 | ||
200 | /** | |
201 | * Iterator - Returns the key of the current element | |
202 | */ | |
203 | public function key() | |
204 | { | |
205 | return $this->keys[$this->position]; | |
206 | } | |
207 | ||
208 | /** | |
209 | * Iterator - Moves forward to next element | |
210 | */ | |
211 | public function next() | |
212 | { | |
213 | ++$this->position; | |
214 | } | |
215 | ||
216 | /** | |
217 | * Iterator - Rewinds the Iterator to the first element | |
218 | * | |
219 | * Entries are sorted by date (latest first) | |
220 | */ | |
221 | public function rewind() | |
222 | { | |
223 | $this->keys = array_keys($this->ids); | |
224 | $this->position = 0; | |
225 | } | |
226 | ||
227 | /** | |
228 | * Iterator - Checks if current position is valid | |
229 | */ | |
230 | public function valid() | |
231 | { | |
232 | return isset($this->keys[$this->position]); | |
233 | } | |
234 | ||
235 | /** | |
236 | * Checks if the DB directory and file exist | |
237 | * | |
238 | * If no DB file is found, creates a dummy DB. | |
239 | */ | |
240 | private function check() | |
241 | { | |
242 | if (file_exists($this->datastore)) { | |
243 | return; | |
244 | } | |
245 | ||
246 | // Create a dummy database for example | |
247 | $this->links = array(); | |
248 | $link = array( | |
249 | 'id' => 1, | |
250 | 'title'=> t('The personal, minimalist, super-fast, database free, bookmarking service'), | |
251 | 'url'=>'https://shaarli.readthedocs.io', | |
252 | 'description'=>t('Welcome to Shaarli! This is your first public bookmark. To edit or delete me, you must first login. | |
253 | ||
254 | To learn how to use Shaarli, consult the link "Documentation" at the bottom of this page. | |
255 | ||
256 | You use the community supported version of the original Shaarli project, by Sebastien Sauvage.'), | |
257 | 'private'=>0, | |
258 | 'created'=> new DateTime(), | |
259 | 'tags'=>'opensource software' | |
260 | ); | |
261 | $link['shorturl'] = link_small_hash($link['created'], $link['id']); | |
262 | $this->links[1] = $link; | |
263 | ||
264 | $link = array( | |
265 | 'id' => 0, | |
266 | 'title'=> t('My secret stuff... - Pastebin.com'), | |
267 | 'url'=>'http://sebsauvage.net/paste/?8434b27936c09649#bR7XsXhoTiLcqCpQbmOpBi3rq2zzQUC5hBI7ZT1O3x8=', | |
268 | 'description'=> t('Shhhh! I\'m a private link only YOU can see. You can delete me too.'), | |
269 | 'private'=>1, | |
270 | 'created'=> new DateTime('1 minute ago'), | |
271 | 'tags'=>'secretstuff', | |
272 | ); | |
273 | $link['shorturl'] = link_small_hash($link['created'], $link['id']); | |
274 | $this->links[0] = $link; | |
275 | ||
276 | // Write database to disk | |
277 | $this->write(); | |
278 | } | |
279 | ||
280 | /** | |
281 | * Reads database from disk to memory | |
282 | */ | |
283 | private function read() | |
284 | { | |
285 | // Public links are hidden and user not logged in => nothing to show | |
286 | if ($this->hidePublicLinks && !$this->loggedIn) { | |
287 | $this->links = array(); | |
288 | return; | |
289 | } | |
290 | ||
291 | $this->urls = []; | |
292 | $this->ids = []; | |
293 | $this->links = FileUtils::readFlatDB($this->datastore, []); | |
294 | ||
295 | $toremove = array(); | |
296 | foreach ($this->links as $key => &$link) { | |
297 | if (! $this->loggedIn && $link['private'] != 0) { | |
298 | // Transition for not upgraded databases. | |
299 | unset($this->links[$key]); | |
300 | continue; | |
301 | } | |
302 | ||
303 | // Sanitize data fields. | |
304 | sanitizeLink($link); | |
305 | ||
306 | // Remove private tags if the user is not logged in. | |
307 | if (! $this->loggedIn) { | |
308 | $link['tags'] = preg_replace('/(^|\s+)\.[^($|\s)]+\s*/', ' ', $link['tags']); | |
309 | } | |
310 | ||
311 | // Do not use the redirector for internal links (Shaarli note URL starting with a '?'). | |
312 | if (!empty($this->redirector) && !startsWith($link['url'], '?')) { | |
313 | $link['real_url'] = $this->redirector; | |
314 | if ($this->redirectorEncode) { | |
315 | $link['real_url'] .= urlencode(unescape($link['url'])); | |
316 | } else { | |
317 | $link['real_url'] .= $link['url']; | |
318 | } | |
319 | } else { | |
320 | $link['real_url'] = $link['url']; | |
321 | } | |
322 | ||
323 | // To be able to load links before running the update, and prepare the update | |
324 | if (! isset($link['created'])) { | |
325 | $link['id'] = $link['linkdate']; | |
326 | $link['created'] = DateTime::createFromFormat(self::LINK_DATE_FORMAT, $link['linkdate']); | |
327 | if (! empty($link['updated'])) { | |
328 | $link['updated'] = DateTime::createFromFormat(self::LINK_DATE_FORMAT, $link['updated']); | |
329 | } | |
330 | $link['shorturl'] = smallHash($link['linkdate']); | |
331 | } | |
332 | ||
333 | $this->urls[$link['url']] = $key; | |
334 | $this->ids[$link['id']] = $key; | |
335 | } | |
336 | } | |
337 | ||
338 | /** | |
339 | * Saves the database from memory to disk | |
340 | * | |
341 | * @throws IOException the datastore is not writable | |
342 | */ | |
343 | private function write() | |
344 | { | |
345 | $this->reorder(); | |
346 | FileUtils::writeFlatDB($this->datastore, $this->links); | |
347 | } | |
348 | ||
349 | /** | |
350 | * Saves the database from memory to disk | |
351 | * | |
352 | * @param string $pageCacheDir page cache directory | |
353 | */ | |
354 | public function save($pageCacheDir) | |
355 | { | |
356 | if (!$this->loggedIn) { | |
357 | // TODO: raise an Exception instead | |
358 | die('You are not authorized to change the database.'); | |
359 | } | |
360 | ||
361 | $this->write(); | |
362 | ||
363 | invalidateCaches($pageCacheDir); | |
364 | } | |
365 | ||
366 | /** | |
367 | * Returns the link for a given URL, or False if it does not exist. | |
368 | * | |
369 | * @param string $url URL to search for | |
370 | * | |
371 | * @return mixed the existing link if it exists, else 'false' | |
372 | */ | |
373 | public function getLinkFromUrl($url) | |
374 | { | |
375 | if (isset($this->urls[$url])) { | |
376 | return $this->links[$this->urls[$url]]; | |
377 | } | |
378 | return false; | |
379 | } | |
380 | ||
381 | /** | |
382 | * Returns the shaare corresponding to a smallHash. | |
383 | * | |
384 | * @param string $request QUERY_STRING server parameter. | |
385 | * | |
386 | * @return array $filtered array containing permalink data. | |
387 | * | |
388 | * @throws LinkNotFoundException if the smallhash is malformed or doesn't match any link. | |
389 | */ | |
390 | public function filterHash($request) | |
391 | { | |
392 | $request = substr($request, 0, 6); | |
393 | $linkFilter = new LinkFilter($this->links); | |
394 | return $linkFilter->filter(LinkFilter::$FILTER_HASH, $request); | |
395 | } | |
396 | ||
397 | /** | |
398 | * Returns the list of articles for a given day. | |
399 | * | |
400 | * @param string $request day to filter. Format: YYYYMMDD. | |
401 | * | |
402 | * @return array list of shaare found. | |
403 | */ | |
404 | public function filterDay($request) | |
405 | { | |
406 | $linkFilter = new LinkFilter($this->links); | |
407 | return $linkFilter->filter(LinkFilter::$FILTER_DAY, $request); | |
408 | } | |
409 | ||
410 | /** | |
411 | * Filter links according to search parameters. | |
412 | * | |
413 | * @param array $filterRequest Search request content. Supported keys: | |
414 | * - searchtags: list of tags | |
415 | * - searchterm: term search | |
416 | * @param bool $casesensitive Optional: Perform case sensitive filter | |
417 | * @param string $visibility return only all/private/public links | |
418 | * @param string $untaggedonly return only untagged links | |
419 | * | |
420 | * @return array filtered links, all links if no suitable filter was provided. | |
421 | */ | |
422 | public function filterSearch($filterRequest = array(), $casesensitive = false, $visibility = 'all', $untaggedonly = false) | |
423 | { | |
424 | // Filter link database according to parameters. | |
425 | $searchtags = isset($filterRequest['searchtags']) ? escape($filterRequest['searchtags']) : ''; | |
426 | $searchterm = isset($filterRequest['searchterm']) ? escape($filterRequest['searchterm']) : ''; | |
427 | ||
428 | // Search tags + fullsearch - blank string parameter will return all links. | |
429 | $type = LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT; // == "vuotext" | |
430 | $request = [$searchtags, $searchterm]; | |
431 | ||
432 | $linkFilter = new LinkFilter($this); | |
433 | return $linkFilter->filter($type, $request, $casesensitive, $visibility, $untaggedonly); | |
434 | } | |
435 | ||
436 | /** | |
437 | * Returns the list tags appearing in the links with the given tags | |
438 | * | |
439 | * @param array $filteringTags tags selecting the links to consider | |
440 | * @param string $visibility process only all/private/public links | |
441 | * | |
442 | * @return array tag => linksCount | |
443 | */ | |
444 | public function linksCountPerTag($filteringTags = [], $visibility = 'all') | |
445 | { | |
446 | $links = $this->filterSearch(['searchtags' => $filteringTags], false, $visibility); | |
447 | $tags = []; | |
448 | $caseMapping = []; | |
449 | foreach ($links as $link) { | |
450 | foreach (preg_split('/\s+/', $link['tags'], 0, PREG_SPLIT_NO_EMPTY) as $tag) { | |
451 | if (empty($tag)) { | |
452 | continue; | |
453 | } | |
454 | // The first case found will be displayed. | |
455 | if (!isset($caseMapping[strtolower($tag)])) { | |
456 | $caseMapping[strtolower($tag)] = $tag; | |
457 | $tags[$caseMapping[strtolower($tag)]] = 0; | |
458 | } | |
459 | $tags[$caseMapping[strtolower($tag)]]++; | |
460 | } | |
461 | } | |
462 | ||
463 | /* | |
464 | * Formerly used arsort(), which doesn't define the sort behaviour for equal values. | |
465 | * Also, this function doesn't produce the same result between PHP 5.6 and 7. | |
466 | * | |
467 | * So we now use array_multisort() to sort tags by DESC occurrences, | |
468 | * then ASC alphabetically for equal values. | |
469 | * | |
470 | * @see https://github.com/shaarli/Shaarli/issues/1142 | |
471 | */ | |
472 | $keys = array_keys($tags); | |
473 | $tmpTags = array_combine($keys, $keys); | |
474 | array_multisort($tags, SORT_DESC, $tmpTags, SORT_ASC, $tags); | |
475 | return $tags; | |
476 | } | |
477 | ||
478 | /** | |
479 | * Rename or delete a tag across all links. | |
480 | * | |
481 | * @param string $from Tag to rename | |
482 | * @param string $to New tag. If none is provided, the from tag will be deleted | |
483 | * | |
484 | * @return array|bool List of altered links or false on error | |
485 | */ | |
486 | public function renameTag($from, $to) | |
487 | { | |
488 | if (empty($from)) { | |
489 | return false; | |
490 | } | |
491 | $delete = empty($to); | |
492 | // True for case-sensitive tag search. | |
493 | $linksToAlter = $this->filterSearch(['searchtags' => $from], true); | |
494 | foreach ($linksToAlter as $key => &$value) { | |
495 | $tags = preg_split('/\s+/', trim($value['tags'])); | |
496 | if (($pos = array_search($from, $tags)) !== false) { | |
497 | if ($delete) { | |
498 | unset($tags[$pos]); // Remove tag. | |
499 | } else { | |
500 | $tags[$pos] = trim($to); | |
501 | } | |
502 | $value['tags'] = trim(implode(' ', array_unique($tags))); | |
503 | $this[$value['id']] = $value; | |
504 | } | |
505 | } | |
506 | ||
507 | return $linksToAlter; | |
508 | } | |
509 | ||
510 | /** | |
511 | * Returns the list of days containing articles (oldest first) | |
512 | * Output: An array containing days (in format YYYYMMDD). | |
513 | */ | |
514 | public function days() | |
515 | { | |
516 | $linkDays = array(); | |
517 | foreach ($this->links as $link) { | |
518 | $linkDays[$link['created']->format('Ymd')] = 0; | |
519 | } | |
520 | $linkDays = array_keys($linkDays); | |
521 | sort($linkDays); | |
522 | ||
523 | return $linkDays; | |
524 | } | |
525 | ||
526 | /** | |
527 | * Reorder links by creation date (newest first). | |
528 | * | |
529 | * Also update the urls and ids mapping arrays. | |
530 | * | |
531 | * @param string $order ASC|DESC | |
532 | */ | |
533 | public function reorder($order = 'DESC') | |
534 | { | |
535 | $order = $order === 'ASC' ? -1 : 1; | |
536 | // Reorder array by dates. | |
537 | usort($this->links, function ($a, $b) use ($order) { | |
538 | if (isset($a['sticky']) && isset($b['sticky']) && $a['sticky'] !== $b['sticky']) { | |
539 | return $a['sticky'] ? -1 : 1; | |
540 | } | |
541 | return $a['created'] < $b['created'] ? 1 * $order : -1 * $order; | |
542 | }); | |
543 | ||
544 | $this->urls = []; | |
545 | $this->ids = []; | |
546 | foreach ($this->links as $key => $link) { | |
547 | $this->urls[$link['url']] = $key; | |
548 | $this->ids[$link['id']] = $key; | |
549 | } | |
550 | } | |
551 | ||
552 | /** | |
553 | * Return the next key for link creation. | |
554 | * E.g. If the last ID is 597, the next will be 598. | |
555 | * | |
556 | * @return int next ID. | |
557 | */ | |
558 | public function getNextId() | |
559 | { | |
560 | if (!empty($this->ids)) { | |
561 | return max(array_keys($this->ids)) + 1; | |
562 | } | |
563 | return 0; | |
564 | } | |
565 | ||
566 | /** | |
567 | * Returns a link offset in links array from its unique ID. | |
568 | * | |
569 | * @param int $id Persistent ID of a link. | |
570 | * | |
571 | * @return int Real offset in local array, or null if doesn't exist. | |
572 | */ | |
573 | protected function getLinkOffset($id) | |
574 | { | |
575 | if (isset($this->ids[$id])) { | |
576 | return $this->ids[$id]; | |
577 | } | |
578 | return null; | |
579 | } | |
580 | } |