update Piwik to version 2.16 (fixes #91)

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

@@ -0,0 +1,172 @@
+<?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 Google PageRank.
+ */
+class Google implements MetricsProvider
+{
+    const SEARCH_URL = 'http://www.google.com/search?hl=en&q=site%3A';
+
+    /**
+     * @var LoggerInterface
+     */
+    private $logger;
+
+    /**
+     * @param LoggerInterface $logger
+     */
+    public function __construct(LoggerInterface $logger)
+    {
+        $this->logger = $logger;
+    }
+
+    public function getMetrics($domain)
+    {
+        $pageCount = $this->fetchIndexedPagesCount($domain);
+        $pageRank = $this->fetchPageRank($domain);
+
+        $logo = SearchEngine::getInstance()->getLogoFromUrl('http://google.com');
+
+        return array(
+            new Metric('google-index', 'SEO_Google_IndexedPages', $pageCount, $logo, null, null, 'General_Pages'),
+            new Metric('pagerank', 'Google PageRank', $pageRank, $logo, null, null, '/10'),
+        );
+    }
+
+    public function fetchIndexedPagesCount($domain)
+    {
+        $url = self::SEARCH_URL . urlencode($domain);
+
+        try {
+            $response = str_replace('&nbsp;', ' ', Http::sendHttpRequest($url, $timeout = 10, @$_SERVER['HTTP_USER_AGENT']));
+
+            if (preg_match('#([0-9\,]+) results#i', $response, $p)) {
+                return NumberFormatter::getInstance()->formatNumber((int)str_replace(',', '', $p[1]));
+            } else {
+                return 0;
+            }
+        } catch (\Exception $e) {
+            $this->logger->warning('Error while getting Google search SEO stats: {message}', array('message' => $e->getMessage()));
+            return null;
+        }
+    }
+
+    public function fetchPageRank($domain)
+    {
+        $chwrite = $this->checkHash($this->hashURL($domain));
+
+        $url = "http://toolbarqueries.google.com/tbr?client=navclient-auto&ch=" . $chwrite . "&features=Rank&q=info:" . $domain . "&num=100&filter=0";
+
+        try {
+            $response = Http::sendHttpRequest($url, $timeout = 10, @$_SERVER['HTTP_USER_AGENT']);
+
+            preg_match('#Rank_[0-9]:[0-9]:([0-9]+){1,}#si', $response, $p);
+
+            return isset($p[1]) ? $p[1] : null;
+        } catch (\Exception $e) {
+            $this->logger->warning('Error while getting Google PageRank for SEO stats: {message}', array('message' => $e->getMessage()));
+            return null;
+        }
+    }
+
+    /**
+     * Generate a hash for a url
+     *
+     * @param string $string
+     * @return int
+     */
+    private function hashURL($string)
+    {
+        $Check1 = $this->strToNum($string, 0x1505, 0x21);
+        $Check2 = $this->strToNum($string, 0, 0x1003F);
+
+        $Check1 >>= 2;
+        $Check1 = (($Check1 >> 4) & 0x3FFFFC0) | ($Check1 & 0x3F);
+        $Check1 = (($Check1 >> 4) & 0x3FFC00) | ($Check1 & 0x3FF);
+        $Check1 = (($Check1 >> 4) & 0x3C000) | ($Check1 & 0x3FFF);
+
+        $T1 = (((($Check1 & 0x3C0) << 4) | ($Check1 & 0x3C)) << 2) | ($Check2 & 0xF0F);
+        $T2 = (((($Check1 & 0xFFFFC000) << 4) | ($Check1 & 0x3C00)) << 0xA) | ($Check2 & 0xF0F0000);
+
+        return ($T1 | $T2);
+    }
+
+    /**
+     * Generate a checksum for the hash string
+     *
+     * @param int $hashnum
+     * @return string
+     */
+    private function checkHash($hashnum)
+    {
+        $CheckByte = 0;
+        $Flag = 0;
+
+        $HashStr = sprintf('%u', $hashnum);
+        $length = strlen($HashStr);
+
+        for ($i = $length - 1; $i >= 0; $i--) {
+            $Re = $HashStr{$i};
+            if (1 === ($Flag % 2)) {
+                $Re += $Re;
+                $Re = (int)($Re / 10) + ($Re % 10);
+            }
+            $CheckByte += $Re;
+            $Flag++;
+        }
+
+        $CheckByte %= 10;
+        if (0 !== $CheckByte) {
+            $CheckByte = 10 - $CheckByte;
+            if (1 === ($Flag % 2)) {
+                if (1 === ($CheckByte % 2)) {
+                    $CheckByte += 9;
+                }
+                $CheckByte >>= 1;
+            }
+        }
+
+        return '7' . $CheckByte . $HashStr;
+    }
+
+    /**
+     * Convert numeric string to int
+     *
+     * @param string $Str
+     * @param int $Check
+     * @param int $Magic
+     * @return int
+     */
+    private function strToNum($Str, $Check, $Magic)
+    {
+        $Int32Unit = 4294967296; // 2^32
+
+        $length = strlen($Str);
+        for ($i = 0; $i < $length; $i++) {
+            $Check *= $Magic;
+            // If the float is beyond the boundaries of integer (usually +/- 2.15e+9 = 2^31),
+            // the result of converting to integer is undefined
+            // refer to http://www.php.net/manual/en/language.types.integer.php
+            if ($Check >= $Int32Unit) {
+                $Check = ($Check - $Int32Unit * (int)($Check / $Int32Unit));
+                //if the check less than -2^31
+                $Check = ($Check < -2147483648) ? ($Check + $Int32Unit) : $Check;
+            }
+            $Check += ord($Str{$i});
+        }
+        return $Check;
+    }
+}