[EtsyBridge] Add new bridge

This bridge generates feeds for a given search term, optionally
adds the picture to the content and allows for additional query
extensions (GET parameters) to be passed to the bridge. That
way custom filter can be applied without the need to reproduce
them in this bridge (they got a lot!)

Etsy provides a good set of feeds as described here:
https://www.etsy.com/help/article/100

(so there is no need to include them here)

References #492

bridges/EtsyBridge.php

@@ -0,0 +1,83 @@
+<?php
+class EtsyBridge extends BridgeAbstract {
+
+	const NAME = 'Etsy search';
+	const URI = 'https://www.etsy.com';
+	const DESCRIPTION = 'Returns feeds for search results';
+	const MAINTAINER = 'logmanoriginal';
+	const PARAMETERS = array(
+		array(
+			'query' => array(
+				'name' => 'Search query',
+				'type' => 'text',
+				'required' => true,
+				'title' => 'Insert your search term here',
+				'exampleValue' => 'Enter your search term'
+			),
+			'queryextension' => array(
+				'name' => 'Query extension',
+				'type' => 'text',
+				'requied' => false,
+				'title' => 'Insert additional query parts here
+(anything after ?search=<your search query>)',
+				'exampleValue' => '&explicit=1&locationQuery=2921044'
+			),
+			'showimage' => array(
+				'name' => 'Show image in content',
+				'type' => 'checkbox',
+				'requrired' => false,
+				'title' => 'Activate to show the image in the content',
+				'defaultValue' => false
+			)
+		)
+	);
+
+	public function collectData(){
+		$html = getSimpleHTMLDOM($this->getURI())
+			or returnServerError('Failed to receive ' . $this->getURI());
+
+		$results = $html->find('div.block-grid-item');
+
+		foreach($results as $result){
+			// Skip banner cards (ads for categories)
+			if($result->find('a.banner-card'))
+				continue;
+
+			$item = array();
+
+			$item['title'] = $result->find('a', 0)->title;
+			$item['uri'] = $result->find('a', 0)->href;
+			$item['author'] = $result->find('div.card-shop-name', 0)->plaintext;
+
+			$item['content'] = '<p>'
+			. $result->find('div.card-price', 0)->plaintext
+			. '</p><p>'
+			. $result->find('div.card-title', 0)->plaintext
+			. '</p>';
+
+			$image = $result->find('img.placeholder', 0)->src;
+
+			if($this->getInput('showimage')){
+				$item['content'] .= '<img src="' . $image . '">';
+			}
+
+			$item['enclosures'] = array($image);
+
+			$this->items[] = $item;
+		}
+	}
+
+	public function getURI(){
+		if(!is_null($this->getInput('query'))){
+			$uri = self::URI . '/search?q=' . urlencode($this->getInput('query'));
+
+			if(!is_null($this->getInput('queryextension'))){
+				$uri .= $this->getInput('queryextension');
+			}
+
+			return $uri;
+		}
+
+		return parent::getURI();
+	}
+}