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