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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 | |
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12 | define('BANANA_FEED_VERSION', '0.1.1'); |
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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 | /** Path where the feed is stored |
40 | */ |
41 | public $path = null; |
42 | |
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43 | /** Create an empty feed |
44 | */ |
45 | private function __construct() |
46 | { |
47 | $this->version = BANANA_FEED_VERSION; |
48 | $this->group = Banana::$group; |
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49 | $this->description = trim(Banana::$protocole->getDescription()); |
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50 | } |
51 | |
52 | /** Update the feed, using current settings of Banana |
53 | * Calling this function suppose that Banana::$spool is the spool of the current box |
54 | */ |
55 | public function update() |
56 | { |
57 | if (!Banana::$spool || Banana::$spool->group != $this->group) { |
58 | return false; |
59 | } |
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60 | if (empty(Banana::$spool->overview)) { |
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61 | $spool_indexes = array(); |
62 | } else { |
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63 | $spool_indexes = array_keys(Banana::$spool->overview); |
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64 | sort($spool_indexes, SORT_NUMERIC); |
65 | $spool_indexes = array_slice($spool_indexes, -Banana::$feed_size, Banana::$feed_size); |
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66 | } |
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67 | $feed_indexes = array_keys($this->messages); |
68 | $old = array_diff($feed_indexes, $spool_indexes); |
69 | foreach ($old as $key) { |
70 | unset($this->messages[$key]); |
71 | } |
72 | $new = array_diff($spool_indexes, $feed_indexes); |
73 | foreach ($new as $key) { |
74 | $message =& Banana::$protocole->getMessage($key); |
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75 | if (is_null($message)) { |
76 | return; |
77 | } |
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78 | $array = array(); |
79 | $array['author'] = $message->getAuthorName(); |
80 | $array['date'] = $message->getHeaderValue('Date'); |
81 | $array['title'] = $message->getHeaderValue('Subject'); |
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82 | $array['body'] = $message->getFormattedBody(); |
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83 | $array['link'] = Banana::$page->makeUrl(array('group' => $this->group, 'artid' => $key)); |
84 | if (Banana::$protocole->canSend()) { |
85 | $array['reply'] = Banana::$page->makeUrl(array('group' => $this->group, 'artid' => $key, 'action' => 'new')); |
86 | } |
87 | $this->messages[$key] = $array; |
88 | } |
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89 | uasort($this->messages, Array('BananaFeed', 'compare')); |
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90 | $this->lastupdate = time(); |
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91 | $this->saveToFile(); |
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92 | } |
93 | |
94 | /** Get the spool corresponding with the current settings of Banana |
95 | */ |
96 | static public function &getFeed() |
97 | { |
98 | $feed =& BananaFeed::readFromFile(); |
99 | if (!$feed) { |
100 | $feed = new BananaFeed(); |
101 | } |
102 | if (Banana::$feed_updateOnDemand) { |
103 | $feed->update(); |
104 | } |
105 | return $feed; |
106 | } |
107 | |
108 | /** Return the cache file name |
109 | */ |
110 | static private function filename() |
111 | { |
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112 | return BananaSpool::getPath('feed'); |
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113 | } |
114 | |
115 | /** Read a feed from a cache file |
116 | */ |
117 | static private function &readFromFile() |
118 | { |
119 | $feed = null; |
120 | $file = BananaFeed::filename(); |
121 | if (!file_exists($file)) { |
122 | return $feed; |
123 | } |
124 | $feed = unserialize(file_get_contents($file)); |
125 | if ($feed->version != BANANA_FEED_VERSION) { |
126 | $feed = null; |
127 | } |
128 | return $feed; |
129 | } |
130 | |
131 | /** Write a feed to a cache file |
132 | */ |
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133 | private function saveToFile() |
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134 | { |
135 | $file = BananaFeed::filename(); |
136 | file_put_contents($file, serialize($this)); |
137 | } |
138 | |
139 | /** Merge to feeds into a new one |
140 | */ |
141 | static public function &merge(&$feed1, &$feed2, $name, $description = null) |
142 | { |
143 | if (!$feed1) { |
144 | $feed = null; |
145 | $feed1 =& $feed2; |
146 | $feed2 =& $feed; |
147 | } |
148 | if ($feed1->group == $name) { |
149 | $master =& $feed1; |
150 | $slave =& $feed2; |
151 | } else if ($feed2 && $feed2->group == $name) { |
152 | $master =& $feed2; |
153 | $slave =& $feed1; |
154 | } else { |
155 | $master = new BananaFeed(); |
156 | $master->group = $name; |
157 | $master->description = $description; |
158 | foreach ($feed1->messages as $key=>$message) { |
159 | $message['title'] = '[' . $feed1->group . '] ' . $message['title']; |
160 | $master->messages[$feed1->group . '-' . $key] = $message; |
161 | } |
162 | $slave =& $feed2; |
163 | } |
164 | if (!$slave) { |
165 | return $master; |
166 | } |
167 | $messages = array(); |
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168 | $m1 = end($master->messages); |
169 | $m2 = end($slave->messages); |
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170 | for ($i = 0 ; $i < 2 * Banana::$feed_size && ($m1 || $m2) ; $i++) { |
171 | if ($m2 && (!$m1 || $m1['date'] < $m2['date'])) { |
172 | $m2['title'] = '[' . $feed2->group . '] ' . $m2['title']; |
173 | $messages[$slave->group . '-' . key($slave->messages)] = $m2; |
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174 | $m2 = prev($slave->messages); |
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175 | } else { |
176 | $messages[key($master->messages)] = $m1; |
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177 | $m1 = prev($master->messages); |
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178 | } |
179 | } |
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180 | uasort($messages, array('BananaFeed', 'compare')); |
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181 | $master->messages =& $messages; |
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182 | $master->lastupdate = time(); |
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183 | return $master; |
184 | } |
185 | |
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186 | static function compare($a, $b) |
187 | { |
188 | if ($a['date'] == $b['date']) { |
189 | return 0; |
190 | } |
191 | return $a['date'] < $b['date'] ? -1 : 1; |
192 | } |
193 | |
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194 | /** Generate the feed xml |
195 | */ |
196 | public function toXML() |
197 | { |
198 | Banana::$page->assign_by_ref('feed', $this); |
199 | return Banana::$page->feed(); |
200 | } |
201 | } |
202 | |
203 | // vim:set et sw=4 sts=4 ts=4 enc=utf-8: |
204 | ?> |