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1 | <?php |
2 | /******************************************************************************** |
3 | * banana/feed.inc.php : Feed Builder |
4 | * ------------------------ |
5 | * |
6 | * This file is part of the banana distribution |
7 | * Copyright: See COPYING files that comes with this distribution |
8 | ********************************************************************************/ |
9 | |
10 | require_once dirname(__FILE__) . '/banana.inc.php'; |
11 | |
12 | define('BANANA_FEED_VERSION', '0.1'); |
13 | |
14 | class BananaFeed |
15 | { |
16 | /** Structure version |
17 | */ |
18 | private $version; |
19 | |
20 | /** Feed name |
21 | */ |
22 | public $group; |
23 | |
24 | /** Feed description |
25 | */ |
26 | public $description; |
27 | |
28 | /** A 'ordered by id' spool of the last messages |
29 | * Each Message is an array with : |
30 | * array('author' => author, 'date' => date (UNIX TS), 'title' => subject, 'body' => html body, |
31 | * 'link' => link, 'reply' => reply) |
32 | */ |
33 | public $messages = array(); |
34 | |
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35 | /** Last update time |
36 | */ |
37 | public $lastupdate = 0; |
38 | |
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39 | /** Create an empty feed |
40 | */ |
41 | private function __construct() |
42 | { |
43 | $this->version = BANANA_FEED_VERSION; |
44 | $this->group = Banana::$group; |
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45 | $this->description = trim(Banana::$protocole->getDescription()); |
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46 | } |
47 | |
48 | /** Update the feed, using current settings of Banana |
49 | * Calling this function suppose that Banana::$spool is the spool of the current box |
50 | */ |
51 | public function update() |
52 | { |
53 | if (!Banana::$spool || Banana::$spool->group != $this->group) { |
54 | return false; |
55 | } |
56 | if (!Banana::$spool->ids) { |
57 | $spool_indexes = array(); |
58 | } else { |
59 | $spool_indexes = Banana::$spool->ids; |
60 | sort($spool_indexes, SORT_NUMERIC); |
61 | $spool_indexes = array_slice($spool_indexes, -Banana::$feed_size, Banana::$feed_size); |
62 | } |
63 | $feed_indexes = array_keys($this->messages); |
64 | $old = array_diff($feed_indexes, $spool_indexes); |
65 | foreach ($old as $key) { |
66 | unset($this->messages[$key]); |
67 | } |
68 | $new = array_diff($spool_indexes, $feed_indexes); |
69 | foreach ($new as $key) { |
70 | $message =& Banana::$protocole->getMessage($key); |
71 | $array = array(); |
72 | $array['author'] = $message->getAuthorName(); |
73 | $array['date'] = $message->getHeaderValue('Date'); |
74 | $array['title'] = $message->getHeaderValue('Subject'); |
75 | $array['body'] = $message->toHtml(); |
76 | $array['link'] = Banana::$page->makeUrl(array('group' => $this->group, 'artid' => $key)); |
77 | if (Banana::$protocole->canSend()) { |
78 | $array['reply'] = Banana::$page->makeUrl(array('group' => $this->group, 'artid' => $key, 'action' => 'new')); |
79 | } |
80 | $this->messages[$key] = $array; |
81 | } |
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82 | uasort($this->messages, Array('BananaFeed', 'compare')); |
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83 | $this->lastupdate = time(); |
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84 | $this->writeToFile(); |
85 | } |
86 | |
87 | /** Get the spool corresponding with the current settings of Banana |
88 | */ |
89 | static public function &getFeed() |
90 | { |
91 | $feed =& BananaFeed::readFromFile(); |
92 | if (!$feed) { |
93 | $feed = new BananaFeed(); |
94 | } |
95 | if (Banana::$feed_updateOnDemand) { |
96 | $feed->update(); |
97 | } |
98 | return $feed; |
99 | } |
100 | |
101 | /** Return the cache file name |
102 | */ |
103 | static private function filename() |
104 | { |
105 | $file = Banana::$spool_root . '/' . Banana::$protocole->name() . '/'; |
106 | if (!is_dir($file)) { |
107 | mkdir($file); |
108 | } |
109 | return $file . Banana::$protocole->filename() . '_feed'; |
110 | } |
111 | |
112 | /** Read a feed from a cache file |
113 | */ |
114 | static private function &readFromFile() |
115 | { |
116 | $feed = null; |
117 | $file = BananaFeed::filename(); |
118 | if (!file_exists($file)) { |
119 | return $feed; |
120 | } |
121 | $feed = unserialize(file_get_contents($file)); |
122 | if ($feed->version != BANANA_FEED_VERSION) { |
123 | $feed = null; |
124 | } |
125 | return $feed; |
126 | } |
127 | |
128 | /** Write a feed to a cache file |
129 | */ |
130 | private function writeToFile() |
131 | { |
132 | $file = BananaFeed::filename(); |
133 | file_put_contents($file, serialize($this)); |
134 | } |
135 | |
136 | /** Merge to feeds into a new one |
137 | */ |
138 | static public function &merge(&$feed1, &$feed2, $name, $description = null) |
139 | { |
140 | if (!$feed1) { |
141 | $feed = null; |
142 | $feed1 =& $feed2; |
143 | $feed2 =& $feed; |
144 | } |
145 | if ($feed1->group == $name) { |
146 | $master =& $feed1; |
147 | $slave =& $feed2; |
148 | } else if ($feed2 && $feed2->group == $name) { |
149 | $master =& $feed2; |
150 | $slave =& $feed1; |
151 | } else { |
152 | $master = new BananaFeed(); |
153 | $master->group = $name; |
154 | $master->description = $description; |
155 | foreach ($feed1->messages as $key=>$message) { |
156 | $message['title'] = '[' . $feed1->group . '] ' . $message['title']; |
157 | $master->messages[$feed1->group . '-' . $key] = $message; |
158 | } |
159 | $slave =& $feed2; |
160 | } |
161 | if (!$slave) { |
162 | return $master; |
163 | } |
164 | $messages = array(); |
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165 | $m1 = end($master->messages); |
166 | $m2 = end($slave->messages); |
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167 | for ($i = 0 ; $i < 2 * Banana::$feed_size && ($m1 || $m2) ; $i++) { |
168 | if ($m2 && (!$m1 || $m1['date'] < $m2['date'])) { |
169 | $m2['title'] = '[' . $feed2->group . '] ' . $m2['title']; |
170 | $messages[$slave->group . '-' . key($slave->messages)] = $m2; |
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171 | $m2 = prev($slave->messages); |
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172 | } else { |
173 | $messages[key($master->messages)] = $m1; |
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174 | $m1 = prev($master->messages); |
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175 | } |
176 | } |
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177 | uasort($messages, array('BananaFeed', 'compare')); |
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178 | $master->messages =& $messages; |
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179 | $master->lastupdate = time(); |
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180 | return $master; |
181 | } |
182 | |
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183 | static function compare($a, $b) |
184 | { |
185 | if ($a['date'] == $b['date']) { |
186 | return 0; |
187 | } |
188 | return $a['date'] < $b['date'] ? -1 : 1; |
189 | } |
190 | |
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191 | /** Generate the feed xml |
192 | */ |
193 | public function toXML() |
194 | { |
195 | Banana::$page->assign_by_ref('feed', $this); |
196 | return Banana::$page->feed(); |
197 | } |
198 | } |
199 | |
200 | // vim:set et sw=4 sts=4 ts=4 enc=utf-8: |
201 | ?> |