update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/SEO/Metric/Alexa.php

@@ -0,0 +1,53 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+namespace Piwik\Plugins\SEO\Metric;
+
+use Piwik\Http;
+use Piwik\NumberFormatter;
+use Piwik\Plugins\Referrers\SearchEngine;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Retrieves the Alexa rank.
+ */
+class Alexa implements MetricsProvider
+{
+    const URL = 'http://data.alexa.com/data?cli=10&url=';
+    const LINK = 'http://www.alexa.com/siteinfo/';
+
+    /**
+     * @var LoggerInterface
+     */
+    private $logger;
+
+    public function __construct(LoggerInterface $logger)
+    {
+        $this->logger = $logger;
+    }
+
+    public function getMetrics($domain)
+    {
+        try {
+            $response = Http::sendHttpRequest(self::URL . urlencode($domain), $timeout = 10, @$_SERVER['HTTP_USER_AGENT']);
+
+            $xml = @simplexml_load_string($response);
+            $value = $xml ? NumberFormatter::getInstance()->formatNumber((int)$xml->SD->POPULARITY['TEXT']) : null;
+        } catch (\Exception $e) {
+            $this->logger->warning('Error while getting Alexa SEO stats: {message}', array('message' => $e->getMessage()));
+            $value = null;
+        }
+
+        $logo = SearchEngine::getInstance()->getLogoFromUrl('http://alexa.com');
+        $link = self::LINK . urlencode($domain);
+
+        return array(
+            new Metric('alexa', 'SEO_AlexaRank', $value, $logo, $link)
+        );
+    }
+}