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