Added Fallback Method for Alexa in SEO Plugin (#13552)

* added fallback method for Alexa, fixes issue #13427

* do not use short array syntax for consistency with other methods

* use mini link for Alexa, use DomXPath to filter out the global ranking instead of regex

1 files changed, 19 insertions, 2 deletions

diff --git a/plugins/SEO/Metric/Alexa.php b/plugins/SEO/Metric/Alexa.php
index bf0b999659..e1a9a0cc1c 100644
--- a/plugins/SEO/Metric/Alexa.php
+++ b/plugins/SEO/Metric/Alexa.php
@@ -18,6 +18,7 @@ use Psr\Log\LoggerInterface;
 class Alexa implements MetricsProvider
 {
     const URL = 'https://data.alexa.com/data?cli=10&url=';
+    const URL_FALLBACK = 'https://www.alexa.com/minisiteinfo/';
     const LINK = 'https://www.alexa.com/siteinfo/';
 
     /**
@@ -34,12 +35,11 @@ class Alexa implements MetricsProvider
     {
         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;
+            $value = $this->tryFallbackMethod($domain);
         }
 
         $logo = "plugins/Morpheus/icons/dist/SEO/alexa.com.png";
@@ -49,4 +49,21 @@ class Alexa implements MetricsProvider
             new Metric('alexa', 'SEO_AlexaRank', $value, $logo, $link)
         );
     }
+
+    private function tryFallbackMethod($domain)
+    {
+        try {
+            $response = Http::sendHttpRequest(self::URL_FALLBACK . urlencode($domain), $timeout = 10, @$_SERVER['HTTP_USER_AGENT']);
+            $dom = new \DomDocument();
+            $dom->loadHTML($response);
+            $nodes = (new \DomXPath($dom))->query("//div[contains(@class, 'data')]");
+            if (isset($nodes[0]->nodeValue)) {
+                $globalRanking = (int) str_replace(array(',', '.'), '', $nodes[0]->nodeValue);
+                return NumberFormatter::getInstance()->formatNumber($globalRanking);
+            }
+        } catch (\Exception $e) {
+            $this->logger->warning('Error while getting Alexa SEO stats via fallback method: {message}', array('message' => $e->getMessage()));
+        }
+        return null;
+    }
 }