[44] | 1 | <?php
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| 2 | /**
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| 3 | * Copyright 2006, 2007, 2008, 2009 Eric D. Hough (http://ehough.com)
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| 4 | *
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| 5 | * This file is part of TubePress (http://tubepress.org)
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| 6 | *
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| 7 | * TubePress is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * TubePress is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with TubePress. If not, see <http://www.gnu.org/licenses/>.
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| 19 | *
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| 20 | */
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| 21 |
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| 22 | function_exists('tubepress_load_classes')
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| 23 | || require(dirname(__FILE__) . '/../../../tubepress_classloader.php');
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| 24 | tubepress_load_classes(array('org_tubepress_gdata_retrieval_FeedRetrievalService',
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| 25 | 'org_tubepress_cache_CacheService'));
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| 26 |
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| 27 | /**
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| 28 | * Base functionality for TubePressFeedRetrieval services
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| 29 | *
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| 30 | */
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| 31 | abstract class org_tubepress_gdata_retrieval_AbstractFeedRetrievalService implements org_tubepress_gdata_retrieval_FeedRetrievalService
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| 32 | {
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| 33 | private $_cache;
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| 34 |
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| 35 | /**
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| 36 | * Fetches the RSS from YouTube
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| 37 | *
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| 38 | * @param org_tubepress_options_manager_OptionsManager $tpom The TubePress options manager
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| 39 | *
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| 40 | * @return DOMDocument The raw RSS from YouTube
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| 41 | */
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| 42 | public function fetch($url, $useCache)
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| 43 | {
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| 44 | $xml = new DOMDocument();
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| 45 | if ($useCache) {
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| 46 | if ($this->_cache->has($url)) {
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| 47 | $cached = $this->_cache->get($url);
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| 48 | $xml->loadXML($cached);
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| 49 | } else {
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| 50 | $xml = $this->_getFromNetwork($url);
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| 51 | $this->_cache->save($url, $xml->saveXML());
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| 52 | }
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| 53 | } else {
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| 54 | $xml = $this->_getFromNetwork($url);
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| 55 | }
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| 56 | return $xml;
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| 57 | }
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| 58 |
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| 59 | private function _getFromNetwork($url)
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| 60 | {
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| 61 | $data = $this->_fetchFromNetwork($url);
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| 62 |
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| 63 | $data = trim($data);
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| 64 |
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| 65 | $doc = new DOMDocument();
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| 66 |
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| 67 | if (substr($data,0,1) != "<") {
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| 68 | throw new Exception("YouTube returned non-xml: " . $data);
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| 69 | }
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| 70 | if ($doc->loadXML($data) === FALSE) {
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| 71 | throw new Exception("YouTube returned invalid XML: " . $data);
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| 72 | }
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| 73 |
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| 74 | return $doc;
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| 75 | }
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| 76 |
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| 77 | protected abstract function _fetchFromNetwork($request);
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| 78 |
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| 79 | public function setCacheService(org_tubepress_cache_CacheService $cache)
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| 80 | {
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| 81 | $this->_cache = $cache;
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| 82 | }
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| 83 | } |
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