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1 | <?php | |
2 | namespace Shaarli\Feed; | |
3 | ||
4 | use DateTime; | |
5 | ||
6 | /** | |
7 | * FeedBuilder class. | |
8 | * | |
9 | * Used to build ATOM and RSS feeds data. | |
10 | */ | |
11 | class FeedBuilder | |
12 | { | |
13 | /** | |
14 | * @var string Constant: RSS feed type. | |
15 | */ | |
16 | public static $FEED_RSS = 'rss'; | |
17 | ||
18 | /** | |
19 | * @var string Constant: ATOM feed type. | |
20 | */ | |
21 | public static $FEED_ATOM = 'atom'; | |
22 | ||
23 | /** | |
24 | * @var string Default language if the locale isn't set. | |
25 | */ | |
26 | public static $DEFAULT_LANGUAGE = 'en-en'; | |
27 | ||
28 | /** | |
29 | * @var int Number of links to display in a feed by default. | |
30 | */ | |
31 | public static $DEFAULT_NB_LINKS = 50; | |
32 | ||
33 | /** | |
34 | * @var \Shaarli\Bookmark\LinkDB instance. | |
35 | */ | |
36 | protected $linkDB; | |
37 | ||
38 | /** | |
39 | * @var string RSS or ATOM feed. | |
40 | */ | |
41 | protected $feedType; | |
42 | ||
43 | /** | |
44 | * @var array $_SERVER | |
45 | */ | |
46 | protected $serverInfo; | |
47 | ||
48 | /** | |
49 | * @var array $_GET | |
50 | */ | |
51 | protected $userInput; | |
52 | ||
53 | /** | |
54 | * @var boolean True if the user is currently logged in, false otherwise. | |
55 | */ | |
56 | protected $isLoggedIn; | |
57 | ||
58 | /** | |
59 | * @var boolean Use permalinks instead of direct links if true. | |
60 | */ | |
61 | protected $usePermalinks; | |
62 | ||
63 | /** | |
64 | * @var boolean true to hide dates in feeds. | |
65 | */ | |
66 | protected $hideDates; | |
67 | ||
68 | /** | |
69 | * @var string server locale. | |
70 | */ | |
71 | protected $locale; | |
72 | ||
73 | /** | |
74 | * @var DateTime Latest item date. | |
75 | */ | |
76 | protected $latestDate; | |
77 | ||
78 | /** | |
79 | * Feed constructor. | |
80 | * | |
81 | * @param \Shaarli\Bookmark\LinkDB $linkDB LinkDB instance. | |
82 | * @param string $feedType Type of feed. | |
83 | * @param array $serverInfo $_SERVER. | |
84 | * @param array $userInput $_GET. | |
85 | * @param boolean $isLoggedIn True if the user is currently logged in, | |
86 | * false otherwise. | |
87 | */ | |
88 | public function __construct($linkDB, $feedType, $serverInfo, $userInput, $isLoggedIn) | |
89 | { | |
90 | $this->linkDB = $linkDB; | |
91 | $this->feedType = $feedType; | |
92 | $this->serverInfo = $serverInfo; | |
93 | $this->userInput = $userInput; | |
94 | $this->isLoggedIn = $isLoggedIn; | |
95 | } | |
96 | ||
97 | /** | |
98 | * Build data for feed templates. | |
99 | * | |
100 | * @return array Formatted data for feeds templates. | |
101 | */ | |
102 | public function buildData() | |
103 | { | |
104 | // Search for untagged links | |
105 | if (isset($this->userInput['searchtags']) && empty($this->userInput['searchtags'])) { | |
106 | $this->userInput['searchtags'] = false; | |
107 | } | |
108 | ||
109 | // Optionally filter the results: | |
110 | $linksToDisplay = $this->linkDB->filterSearch($this->userInput); | |
111 | ||
112 | $nblinksToDisplay = $this->getNbLinks(count($linksToDisplay)); | |
113 | ||
114 | // Can't use array_keys() because $link is a LinkDB instance and not a real array. | |
115 | $keys = array(); | |
116 | foreach ($linksToDisplay as $key => $value) { | |
117 | $keys[] = $key; | |
118 | } | |
119 | ||
120 | $pageaddr = escape(index_url($this->serverInfo)); | |
121 | $linkDisplayed = array(); | |
122 | for ($i = 0; $i < $nblinksToDisplay && $i < count($keys); $i++) { | |
123 | $linkDisplayed[$keys[$i]] = $this->buildItem($linksToDisplay[$keys[$i]], $pageaddr); | |
124 | } | |
125 | ||
126 | $data['language'] = $this->getTypeLanguage(); | |
127 | $data['last_update'] = $this->getLatestDateFormatted(); | |
128 | $data['show_dates'] = !$this->hideDates || $this->isLoggedIn; | |
129 | // Remove leading slash from REQUEST_URI. | |
130 | $data['self_link'] = escape(server_url($this->serverInfo)) | |
131 | . escape($this->serverInfo['REQUEST_URI']); | |
132 | $data['index_url'] = $pageaddr; | |
133 | $data['usepermalinks'] = $this->usePermalinks === true; | |
134 | $data['links'] = $linkDisplayed; | |
135 | ||
136 | return $data; | |
137 | } | |
138 | ||
139 | /** | |
140 | * Build a feed item (one per shaare). | |
141 | * | |
142 | * @param array $link Single link array extracted from LinkDB. | |
143 | * @param string $pageaddr Index URL. | |
144 | * | |
145 | * @return array Link array with feed attributes. | |
146 | */ | |
147 | protected function buildItem($link, $pageaddr) | |
148 | { | |
149 | $link['guid'] = $pageaddr . '?' . $link['shorturl']; | |
150 | // Check for both signs of a note: starting with ? and 7 chars long. | |
151 | if ($link['url'][0] === '?' && strlen($link['url']) === 7) { | |
152 | $link['url'] = $pageaddr . $link['url']; | |
153 | } | |
154 | if ($this->usePermalinks === true) { | |
155 | $permalink = '<a href="' . $link['url'] . '" title="' . t('Direct link') . '">' . t('Direct link') . '</a>'; | |
156 | } else { | |
157 | $permalink = '<a href="' . $link['guid'] . '" title="' . t('Permalink') . '">' . t('Permalink') . '</a>'; | |
158 | } | |
159 | $link['description'] = format_description($link['description'], $pageaddr); | |
160 | $link['description'] .= PHP_EOL . '<br>— ' . $permalink; | |
161 | ||
162 | $pubDate = $link['created']; | |
163 | $link['pub_iso_date'] = $this->getIsoDate($pubDate); | |
164 | ||
165 | // atom:entry elements MUST contain exactly one atom:updated element. | |
166 | if (!empty($link['updated'])) { | |
167 | $upDate = $link['updated']; | |
168 | $link['up_iso_date'] = $this->getIsoDate($upDate, DateTime::ATOM); | |
169 | } else { | |
170 | $link['up_iso_date'] = $this->getIsoDate($pubDate, DateTime::ATOM); | |
171 | } | |
172 | ||
173 | // Save the more recent item. | |
174 | if (empty($this->latestDate) || $this->latestDate < $pubDate) { | |
175 | $this->latestDate = $pubDate; | |
176 | } | |
177 | if (!empty($upDate) && $this->latestDate < $upDate) { | |
178 | $this->latestDate = $upDate; | |
179 | } | |
180 | ||
181 | $taglist = array_filter(explode(' ', $link['tags']), 'strlen'); | |
182 | uasort($taglist, 'strcasecmp'); | |
183 | $link['taglist'] = $taglist; | |
184 | ||
185 | return $link; | |
186 | } | |
187 | ||
188 | /** | |
189 | * Set this to true to use permalinks instead of direct links. | |
190 | * | |
191 | * @param boolean $usePermalinks true to force permalinks. | |
192 | */ | |
193 | public function setUsePermalinks($usePermalinks) | |
194 | { | |
195 | $this->usePermalinks = $usePermalinks; | |
196 | } | |
197 | ||
198 | /** | |
199 | * Set this to true to hide timestamps in feeds. | |
200 | * | |
201 | * @param boolean $hideDates true to enable. | |
202 | */ | |
203 | public function setHideDates($hideDates) | |
204 | { | |
205 | $this->hideDates = $hideDates; | |
206 | } | |
207 | ||
208 | /** | |
209 | * Set the locale. Used to show feed language. | |
210 | * | |
211 | * @param string $locale The locale (eg. 'fr_FR.UTF8'). | |
212 | */ | |
213 | public function setLocale($locale) | |
214 | { | |
215 | $this->locale = strtolower($locale); | |
216 | } | |
217 | ||
218 | /** | |
219 | * Get the language according to the feed type, based on the locale: | |
220 | * | |
221 | * - RSS format: en-us (default: 'en-en'). | |
222 | * - ATOM format: fr (default: 'en'). | |
223 | * | |
224 | * @return string The language. | |
225 | */ | |
226 | public function getTypeLanguage() | |
227 | { | |
228 | // Use the locale do define the language, if available. | |
229 | if (!empty($this->locale) && preg_match('/^\w{2}[_\-]\w{2}/', $this->locale)) { | |
230 | $length = ($this->feedType === self::$FEED_RSS) ? 5 : 2; | |
231 | return str_replace('_', '-', substr($this->locale, 0, $length)); | |
232 | } | |
233 | return ($this->feedType === self::$FEED_RSS) ? 'en-en' : 'en'; | |
234 | } | |
235 | ||
236 | /** | |
237 | * Format the latest item date found according to the feed type. | |
238 | * | |
239 | * Return an empty string if invalid DateTime is passed. | |
240 | * | |
241 | * @return string Formatted date. | |
242 | */ | |
243 | protected function getLatestDateFormatted() | |
244 | { | |
245 | if (empty($this->latestDate) || !$this->latestDate instanceof DateTime) { | |
246 | return ''; | |
247 | } | |
248 | ||
249 | $type = ($this->feedType == self::$FEED_RSS) ? DateTime::RSS : DateTime::ATOM; | |
250 | return $this->latestDate->format($type); | |
251 | } | |
252 | ||
253 | /** | |
254 | * Get ISO date from DateTime according to feed type. | |
255 | * | |
256 | * @param DateTime $date Date to format. | |
257 | * @param string|bool $format Force format. | |
258 | * | |
259 | * @return string Formatted date. | |
260 | */ | |
261 | protected function getIsoDate(DateTime $date, $format = false) | |
262 | { | |
263 | if ($format !== false) { | |
264 | return $date->format($format); | |
265 | } | |
266 | if ($this->feedType == self::$FEED_RSS) { | |
267 | return $date->format(DateTime::RSS); | |
268 | } | |
269 | return $date->format(DateTime::ATOM); | |
270 | } | |
271 | ||
272 | /** | |
273 | * Returns the number of link to display according to 'nb' user input parameter. | |
274 | * | |
275 | * If 'nb' not set or invalid, default value: $DEFAULT_NB_LINKS. | |
276 | * If 'nb' is set to 'all', display all filtered links (max parameter). | |
277 | * | |
278 | * @param int $max maximum number of links to display. | |
279 | * | |
280 | * @return int number of links to display. | |
281 | */ | |
282 | public function getNbLinks($max) | |
283 | { | |
284 | if (empty($this->userInput['nb'])) { | |
285 | return self::$DEFAULT_NB_LINKS; | |
286 | } | |
287 | ||
288 | if ($this->userInput['nb'] == 'all') { | |
289 | return $max; | |
290 | } | |
291 | ||
292 | $intNb = intval($this->userInput['nb']); | |
293 | if (!is_int($intNb) || $intNb == 0) { | |
294 | return self::$DEFAULT_NB_LINKS; | |
295 | } | |
296 | ||
297 | return $intNb; | |
298 | } | |
299 | } |