[DockerhubBridge] Add bridge (#1990)

bridges/DockerhubBridge.php

@@ -0,0 +1,114 @@
+<?php
+class DockerhubBridge extends BridgeAbstract {
+	const NAME = 'Dockerhub Bridge';
+	const URI = 'https://hub.docker.com';
+	const DESCRIPTION = 'Returns new images for a container';
+	const MAINTAINER = 'VerifiedJoseph';
+	const PARAMETERS = array(array(
+			'user' => array(
+				'name' => 'User',
+				'type' => 'text',
+				'required' => true,
+				'exampleValue' => 'rssbridge',
+			),
+			'repo' => array(
+				'name' => 'Repository',
+				'type' => 'text',
+				'required' => true,
+				'exampleValue' => 'rss-bridge',
+			)
+		)
+	);
+
+	const CACHE_TIMEOUT = 3600; // 1 hour
+
+	private $apiURL = 'https://hub.docker.com/v2/repositories/';
+
+	public function collectData() {
+		$json = getContents($this->getApiUrl())
+			or returnServerError('Could not request: ' . $this->getURI());
+
+		$data = json_decode($json, false);
+
+		foreach ($data->results as $result) {
+			$item = array();
+
+			$lastPushed = date('Y-m-d H:i:s', strtotime($result->tag_last_pushed));
+
+			$item['title'] = $result->name;
+			$item['uid'] = $result->id;
+			$item['uri'] = $this->getTagUrl($result->name);
+			$item['author'] = $result->last_updater_username;
+			$item['timestamp'] = $result->tag_last_pushed;
+			$item['content'] = <<<EOD
+<Strong>Tag</strong><br>
+<p>{$result->name}</p>
+<Strong>Last pushed</strong><br>
+<p>{$lastPushed}</p>
+<Strong>Images</strong><br>
+{$this->getImages($result)}
+EOD;
+
+			$this->items[] = $item;
+		}
+
+	}
+
+	public function getURI() {
+		if ($this->getInput('user')) {
+			return self::URI . '/r/' . $this->getRepo();
+		}
+
+		return parent::getURI();
+	}
+
+	public function getName() {
+		if ($this->getInput('user')) {
+			return $this->getRepo() . ' - Dockerhub';
+		}
+
+		return parent::getName();
+	}
+
+	private function getRepo() {
+		return $this->getInput('user') . '/' . $this->getInput('repo');
+	}
+
+	private function getApiUrl() {
+		return $this->apiURL . $this->getRepo() . '/tags/?page_size=25&page=1';
+	}
+
+	private function getLayerUrl($name, $digest) {
+		return self::URI . '/layers/' . $this->getRepo() . '/' . $name . '/images/' . $digest;
+	}
+
+	private function getTagUrl($name) {
+		return self::URI . '/r/' . $this->getRepo() . '/tags?name=' . $name;
+	}
+
+	private function getImages($result) {
+		$html = <<<EOD
+<table style="width:300px;"><thead><tr><th>Digest</th><th>OS/architecture</th></tr></thead></tbody>
+EOD;
+
+		foreach ($result->images as $image) {
+			$layersUrl = $this->getLayerUrl($result->name, $image->digest);
+			$id = $this->getShortDigestId($image->digest);
+
+			$html .= <<<EOD
+			<tr>
+				<td><a href="{$layersUrl}">{$id}</a></td>
+				<td>{$image->os}/{$image->architecture}</td>
+			</tr>
+<!--<a href="{$layersUrl}">{$id}</a> {$image->os}/{$image->architecture}-->
+EOD;
+		}
+
+		return $html . '</tbody></table>';
+	}
+
+	private function getShortDigestId($digest) {
+		$parts = explode(':', $digest);
+		return substr($parts[1], 0, 12);
+	}
+}