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/usr/share/rss-bridge/bridges/DuckDuckGoBridge.php is in rss-bridge 2017-08-03-3.

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<?php
class DuckDuckGoBridge extends BridgeAbstract {

	const MAINTAINER = 'Astalaseven';
	const NAME = 'DuckDuckGo';
	const URI = 'https://duckduckgo.com/';
	const CACHE_TIMEOUT = 21600; // 6h
	const DESCRIPTION = 'Returns results from DuckDuckGo.';

	const SORT_DATE = '+sort:date';
	const SORT_RELEVANCE = '';

	const PARAMETERS = array( array(
		'u' => array(
			'name' => 'keyword',
			'required' => true
		),
		'sort' => array(
			'name' => 'sort by',
			'type' => 'list',
			'required' => false,
			'values' => array(
				'date' => self::SORT_DATE,
				'relevance' => self::SORT_RELEVANCE
			),
			'defaultValue' => self::SORT_DATE
		)
	));

	public function collectData(){
		$html = getSimpleHTMLDOM(self::URI . 'html/?kd=-1&q=' . $this->getInput('u') . $this->getInput('sort'))
			or returnServerError('Could not request DuckDuckGo.');

		foreach($html->find('div.results_links') as $element) {
			$item = array();
			$item['uri'] = $element->find('a', 0)->href;
			$item['title'] = $element->find('a', 1)->innertext;
			$item['content'] = $element->find('div.snippet', 0)->plaintext;
			$this->items[] = $item;
		}
	}
}