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1 | <?php | |
2 | ||
3 | /** | |
4 | * Class LinkFilter. | |
5 | * | |
6 | * Perform search and filter operation on link data list. | |
7 | */ | |
8 | class LinkFilter | |
9 | { | |
10 | /** | |
11 | * @var string permalinks. | |
12 | */ | |
13 | public static $FILTER_HASH = 'permalink'; | |
14 | ||
15 | /** | |
16 | * @var string text search. | |
17 | */ | |
18 | public static $FILTER_TEXT = 'fulltext'; | |
19 | ||
20 | /** | |
21 | * @var string tag filter. | |
22 | */ | |
23 | public static $FILTER_TAG = 'tags'; | |
24 | ||
25 | /** | |
26 | * @var string filter by day. | |
27 | */ | |
28 | public static $FILTER_DAY = 'FILTER_DAY'; | |
29 | ||
30 | /** | |
31 | * @var string Allowed characters for hashtags (regex syntax). | |
32 | */ | |
33 | public static $HASHTAG_CHARS = '\p{Pc}\p{N}\p{L}\p{Mn}'; | |
34 | ||
35 | /** | |
36 | * @var LinkDB all available links. | |
37 | */ | |
38 | private $links; | |
39 | ||
40 | /** | |
41 | * @param LinkDB $links initialization. | |
42 | */ | |
43 | public function __construct($links) | |
44 | { | |
45 | $this->links = $links; | |
46 | } | |
47 | ||
48 | /** | |
49 | * Filter links according to parameters. | |
50 | * | |
51 | * @param string $type Type of filter (eg. tags, permalink, etc.). | |
52 | * @param mixed $request Filter content. | |
53 | * @param bool $casesensitive Optional: Perform case sensitive filter if true. | |
54 | * @param string $visibility Optional: return only all/private/public links | |
55 | * @param string $untaggedonly Optional: return only untagged links. Applies only if $type includes FILTER_TAG | |
56 | * | |
57 | * @return array filtered link list. | |
58 | */ | |
59 | public function filter($type, $request, $casesensitive = false, $visibility = 'all', $untaggedonly = false) | |
60 | { | |
61 | if (! in_array($visibility, ['all', 'public', 'private'])) { | |
62 | $visibility = 'all'; | |
63 | } | |
64 | ||
65 | switch($type) { | |
66 | case self::$FILTER_HASH: | |
67 | return $this->filterSmallHash($request); | |
68 | case self::$FILTER_TAG | self::$FILTER_TEXT: // == "vuotext" | |
69 | $noRequest = empty($request) || (empty($request[0]) && empty($request[1])); | |
70 | if ($noRequest) { | |
71 | if ($untaggedonly) { | |
72 | return $this->filterUntagged($visibility); | |
73 | } | |
74 | return $this->noFilter($visibility); | |
75 | } | |
76 | if ($untaggedonly) { | |
77 | $filtered = $this->filterUntagged($visibility); | |
78 | } else { | |
79 | $filtered = $this->links; | |
80 | } | |
81 | if (!empty($request[0])) { | |
82 | $filtered = (new LinkFilter($filtered))->filterTags($request[0], $casesensitive, $visibility); | |
83 | } | |
84 | if (!empty($request[1])) { | |
85 | $filtered = (new LinkFilter($filtered))->filterFulltext($request[1], $visibility); | |
86 | } | |
87 | return $filtered; | |
88 | case self::$FILTER_TEXT: | |
89 | return $this->filterFulltext($request, $visibility); | |
90 | case self::$FILTER_TAG: | |
91 | if ($untaggedonly) { | |
92 | return $this->filterUntagged($visibility); | |
93 | } else { | |
94 | return $this->filterTags($request, $casesensitive, $visibility); | |
95 | } | |
96 | case self::$FILTER_DAY: | |
97 | return $this->filterDay($request); | |
98 | default: | |
99 | return $this->noFilter($visibility); | |
100 | } | |
101 | } | |
102 | ||
103 | /** | |
104 | * Unknown filter, but handle private only. | |
105 | * | |
106 | * @param string $visibility Optional: return only all/private/public links | |
107 | * | |
108 | * @return array filtered links. | |
109 | */ | |
110 | private function noFilter($visibility = 'all') | |
111 | { | |
112 | if ($visibility === 'all') { | |
113 | return $this->links; | |
114 | } | |
115 | ||
116 | $out = array(); | |
117 | foreach ($this->links as $key => $value) { | |
118 | if ($value['private'] && $visibility === 'private') { | |
119 | $out[$key] = $value; | |
120 | } else if (! $value['private'] && $visibility === 'public') { | |
121 | $out[$key] = $value; | |
122 | } | |
123 | } | |
124 | ||
125 | return $out; | |
126 | } | |
127 | ||
128 | /** | |
129 | * Returns the shaare corresponding to a smallHash. | |
130 | * | |
131 | * @param string $smallHash permalink hash. | |
132 | * | |
133 | * @return array $filtered array containing permalink data. | |
134 | * | |
135 | * @throws LinkNotFoundException if the smallhash doesn't match any link. | |
136 | */ | |
137 | private function filterSmallHash($smallHash) | |
138 | { | |
139 | $filtered = array(); | |
140 | foreach ($this->links as $key => $l) { | |
141 | if ($smallHash == $l['shorturl']) { | |
142 | // Yes, this is ugly and slow | |
143 | $filtered[$key] = $l; | |
144 | return $filtered; | |
145 | } | |
146 | } | |
147 | ||
148 | if (empty($filtered)) { | |
149 | throw new LinkNotFoundException(); | |
150 | } | |
151 | ||
152 | return $filtered; | |
153 | } | |
154 | ||
155 | /** | |
156 | * Returns the list of links corresponding to a full-text search | |
157 | * | |
158 | * Searches: | |
159 | * - in the URLs, title and description; | |
160 | * - are case-insensitive; | |
161 | * - terms surrounded by quotes " are exact terms search. | |
162 | * - terms starting with a dash - are excluded (except exact terms). | |
163 | * | |
164 | * Example: | |
165 | * print_r($mydb->filterFulltext('hollandais')); | |
166 | * | |
167 | * mb_convert_case($val, MB_CASE_LOWER, 'UTF-8') | |
168 | * - allows to perform searches on Unicode text | |
169 | * - see https://github.com/shaarli/Shaarli/issues/75 for examples | |
170 | * | |
171 | * @param string $searchterms search query. | |
172 | * @param string $visibility Optional: return only all/private/public links. | |
173 | * | |
174 | * @return array search results. | |
175 | */ | |
176 | private function filterFulltext($searchterms, $visibility = 'all') | |
177 | { | |
178 | if (empty($searchterms)) { | |
179 | return $this->noFilter($visibility); | |
180 | } | |
181 | ||
182 | $filtered = array(); | |
183 | $search = mb_convert_case(html_entity_decode($searchterms), MB_CASE_LOWER, 'UTF-8'); | |
184 | $exactRegex = '/"([^"]+)"/'; | |
185 | // Retrieve exact search terms. | |
186 | preg_match_all($exactRegex, $search, $exactSearch); | |
187 | $exactSearch = array_values(array_filter($exactSearch[1])); | |
188 | ||
189 | // Remove exact search terms to get AND terms search. | |
190 | $explodedSearchAnd = explode(' ', trim(preg_replace($exactRegex, '', $search))); | |
191 | $explodedSearchAnd = array_values(array_filter($explodedSearchAnd)); | |
192 | ||
193 | // Filter excluding terms and update andSearch. | |
194 | $excludeSearch = array(); | |
195 | $andSearch = array(); | |
196 | foreach ($explodedSearchAnd as $needle) { | |
197 | if ($needle[0] == '-' && strlen($needle) > 1) { | |
198 | $excludeSearch[] = substr($needle, 1); | |
199 | } else { | |
200 | $andSearch[] = $needle; | |
201 | } | |
202 | } | |
203 | ||
204 | $keys = array('title', 'description', 'url', 'tags'); | |
205 | ||
206 | // Iterate over every stored link. | |
207 | foreach ($this->links as $id => $link) { | |
208 | ||
209 | // ignore non private links when 'privatonly' is on. | |
210 | if ($visibility !== 'all') { | |
211 | if (! $link['private'] && $visibility === 'private') { | |
212 | continue; | |
213 | } else if ($link['private'] && $visibility === 'public') { | |
214 | continue; | |
215 | } | |
216 | } | |
217 | ||
218 | // Concatenate link fields to search across fields. | |
219 | // Adds a '\' separator for exact search terms. | |
220 | $content = ''; | |
221 | foreach ($keys as $key) { | |
222 | $content .= mb_convert_case($link[$key], MB_CASE_LOWER, 'UTF-8') . '\\'; | |
223 | } | |
224 | ||
225 | // Be optimistic | |
226 | $found = true; | |
227 | ||
228 | // First, we look for exact term search | |
229 | for ($i = 0; $i < count($exactSearch) && $found; $i++) { | |
230 | $found = strpos($content, $exactSearch[$i]) !== false; | |
231 | } | |
232 | ||
233 | // Iterate over keywords, if keyword is not found, | |
234 | // no need to check for the others. We want all or nothing. | |
235 | for ($i = 0; $i < count($andSearch) && $found; $i++) { | |
236 | $found = strpos($content, $andSearch[$i]) !== false; | |
237 | } | |
238 | ||
239 | // Exclude terms. | |
240 | for ($i = 0; $i < count($excludeSearch) && $found; $i++) { | |
241 | $found = strpos($content, $excludeSearch[$i]) === false; | |
242 | } | |
243 | ||
244 | if ($found) { | |
245 | $filtered[$id] = $link; | |
246 | } | |
247 | } | |
248 | ||
249 | return $filtered; | |
250 | } | |
251 | ||
252 | /** | |
253 | * Returns the list of links associated with a given list of tags | |
254 | * | |
255 | * You can specify one or more tags, separated by space or a comma, e.g. | |
256 | * print_r($mydb->filterTags('linux programming')); | |
257 | * | |
258 | * @param string $tags list of tags separated by commas or blank spaces. | |
259 | * @param bool $casesensitive ignore case if false. | |
260 | * @param string $visibility Optional: return only all/private/public links. | |
261 | * | |
262 | * @return array filtered links. | |
263 | */ | |
264 | public function filterTags($tags, $casesensitive = false, $visibility = 'all') | |
265 | { | |
266 | // Implode if array for clean up. | |
267 | $tags = is_array($tags) ? trim(implode(' ', $tags)) : $tags; | |
268 | if (empty($tags)) { | |
269 | return $this->noFilter($visibility); | |
270 | } | |
271 | ||
272 | $searchtags = self::tagsStrToArray($tags, $casesensitive); | |
273 | $filtered = array(); | |
274 | if (empty($searchtags)) { | |
275 | return $filtered; | |
276 | } | |
277 | ||
278 | foreach ($this->links as $key => $link) { | |
279 | // ignore non private links when 'privatonly' is on. | |
280 | if ($visibility !== 'all') { | |
281 | if (! $link['private'] && $visibility === 'private') { | |
282 | continue; | |
283 | } else if ($link['private'] && $visibility === 'public') { | |
284 | continue; | |
285 | } | |
286 | } | |
287 | ||
288 | $linktags = self::tagsStrToArray($link['tags'], $casesensitive); | |
289 | ||
290 | $found = true; | |
291 | for ($i = 0 ; $i < count($searchtags) && $found; $i++) { | |
292 | // Exclusive search, quit if tag found. | |
293 | // Or, tag not found in the link, quit. | |
294 | if (($searchtags[$i][0] == '-' | |
295 | && $this->searchTagAndHashTag(substr($searchtags[$i], 1), $linktags, $link['description'])) | |
296 | || ($searchtags[$i][0] != '-') | |
297 | && ! $this->searchTagAndHashTag($searchtags[$i], $linktags, $link['description']) | |
298 | ) { | |
299 | $found = false; | |
300 | } | |
301 | } | |
302 | ||
303 | if ($found) { | |
304 | $filtered[$key] = $link; | |
305 | } | |
306 | } | |
307 | return $filtered; | |
308 | } | |
309 | ||
310 | /** | |
311 | * Return only links without any tag. | |
312 | * | |
313 | * @param string $visibility return only all/private/public links. | |
314 | * | |
315 | * @return array filtered links. | |
316 | */ | |
317 | public function filterUntagged($visibility) | |
318 | { | |
319 | $filtered = []; | |
320 | foreach ($this->links as $key => $link) { | |
321 | if ($visibility !== 'all') { | |
322 | if (! $link['private'] && $visibility === 'private') { | |
323 | continue; | |
324 | } else if ($link['private'] && $visibility === 'public') { | |
325 | continue; | |
326 | } | |
327 | } | |
328 | ||
329 | if (empty(trim($link['tags']))) { | |
330 | $filtered[$key] = $link; | |
331 | } | |
332 | } | |
333 | ||
334 | return $filtered; | |
335 | } | |
336 | ||
337 | /** | |
338 | * Returns the list of articles for a given day, chronologically sorted | |
339 | * | |
340 | * Day must be in the form 'YYYYMMDD' (e.g. '20120125'), e.g. | |
341 | * print_r($mydb->filterDay('20120125')); | |
342 | * | |
343 | * @param string $day day to filter. | |
344 | * | |
345 | * @return array all link matching given day. | |
346 | * | |
347 | * @throws Exception if date format is invalid. | |
348 | */ | |
349 | public function filterDay($day) | |
350 | { | |
351 | if (! checkDateFormat('Ymd', $day)) { | |
352 | throw new Exception('Invalid date format'); | |
353 | } | |
354 | ||
355 | $filtered = array(); | |
356 | foreach ($this->links as $key => $l) { | |
357 | if ($l['created']->format('Ymd') == $day) { | |
358 | $filtered[$key] = $l; | |
359 | } | |
360 | } | |
361 | ||
362 | // sort by date ASC | |
363 | return array_reverse($filtered, true); | |
364 | } | |
365 | ||
366 | /** | |
367 | * Check if a tag is found in the taglist, or as an hashtag in the link description. | |
368 | * | |
369 | * @param string $tag Tag to search. | |
370 | * @param array $taglist List of tags for the current link. | |
371 | * @param string $description Link description. | |
372 | * | |
373 | * @return bool True if found, false otherwise. | |
374 | */ | |
375 | protected function searchTagAndHashTag($tag, $taglist, $description) | |
376 | { | |
377 | if (in_array($tag, $taglist)) { | |
378 | return true; | |
379 | } | |
380 | ||
381 | if (preg_match('/(^| )#'. $tag .'([^'. self::$HASHTAG_CHARS .']|$)/mui', $description) > 0) { | |
382 | return true; | |
383 | } | |
384 | ||
385 | return false; | |
386 | } | |
387 | ||
388 | /** | |
389 | * Convert a list of tags (str) to an array. Also | |
390 | * - handle case sensitivity. | |
391 | * - accepts spaces commas as separator. | |
392 | * | |
393 | * @param string $tags string containing a list of tags. | |
394 | * @param bool $casesensitive will convert everything to lowercase if false. | |
395 | * | |
396 | * @return array filtered tags string. | |
397 | */ | |
398 | public static function tagsStrToArray($tags, $casesensitive) | |
399 | { | |
400 | // We use UTF-8 conversion to handle various graphemes (i.e. cyrillic, or greek) | |
401 | $tagsOut = $casesensitive ? $tags : mb_convert_case($tags, MB_CASE_LOWER, 'UTF-8'); | |
402 | $tagsOut = str_replace(',', ' ', $tagsOut); | |
403 | ||
404 | return preg_split('/\s+/', $tagsOut, -1, PREG_SPLIT_NO_EMPTY); | |
405 | } | |
406 | } | |
407 | ||
408 | class LinkNotFoundException extends Exception | |
409 | { | |
410 | protected $message = 'The link you are trying to reach does not exist or has been deleted.'; | |
411 | } |