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msd2/tracking/piwik/core/UpdateCheck.php

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+<?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;
+
+use Piwik\Container\StaticContainer;
+
+/**
+ * Class to check if a newer version of Piwik is available
+ */
+class UpdateCheck
+{
+    const CHECK_INTERVAL = 28800; // every 8 hours
+    const UI_CLICK_CHECK_INTERVAL = 10; // every 10s when user clicks UI link
+    const LAST_TIME_CHECKED = 'UpdateCheck_LastTimeChecked';
+    const LATEST_VERSION = 'UpdateCheck_LatestVersion';
+    const SOCKET_TIMEOUT = 2;
+
+    /**
+     * Check for a newer version
+     *
+     * @param bool $force Force check
+     * @param int $interval Interval used for update checks
+     */
+    public static function check($force = false, $interval = null)
+    {
+        if (!SettingsPiwik::isAutoUpdateEnabled()) {
+            return;
+        }
+
+        if ($interval === null) {
+            $interval = self::CHECK_INTERVAL;
+        }
+
+        $lastTimeChecked = Option::get(self::LAST_TIME_CHECKED);
+        if ($force
+            || $lastTimeChecked === false
+            || time() - $interval > $lastTimeChecked
+        ) {
+            // set the time checked first, so that parallel Piwik requests don't all trigger the http requests
+            Option::set(self::LAST_TIME_CHECKED, time(), $autoLoad = 1);
+
+            $latestVersion = self::getLatestAvailableVersionNumber();
+            $latestVersion = trim((string) $latestVersion);
+            if (!preg_match('~^[0-9][0-9a-zA-Z_.-]*$~D', $latestVersion)) {
+                $latestVersion = '';
+            }
+
+            Option::set(self::LATEST_VERSION, $latestVersion);
+        }
+    }
+
+    /**
+     * Get the latest available version number for the currently active release channel. Eg '2.15.0-b4' or '2.15.0'.
+     * Should return a semantic version number in format MAJOR.MINOR.PATCH (http://semver.org/).
+     * Returns an empty string in case one cannot connect to the remote server.
+     * @return string
+     */
+    private static function getLatestAvailableVersionNumber()
+    {
+        $releaseChannels = StaticContainer::get('\Piwik\Plugin\ReleaseChannels');
+        $channel = $releaseChannels->getActiveReleaseChannel();
+        $url = $channel->getUrlToCheckForLatestAvailableVersion();
+
+        try {
+            $latestVersion = Http::sendHttpRequest($url, self::SOCKET_TIMEOUT);
+        } catch (\Exception $e) {
+            // e.g., disable_functions = fsockopen; allow_url_open = Off
+            $latestVersion = '';
+        }
+
+        return $latestVersion;
+    }
+
+    /**
+     * Returns the latest available version number. Does not perform a check whether a later version is available.
+     *
+     * @return false|string
+     */
+    public static function getLatestVersion()
+    {
+        return Option::get(self::LATEST_VERSION);
+    }
+
+    /**
+     * Returns version number of a newer Piwik release.
+     *
+     * @return string|bool  false if current version is the latest available,
+     *                       or the latest version number if a newest release is available
+     */
+    public static function isNewestVersionAvailable()
+    {
+        $latestVersion = self::getLatestVersion();
+        if (!empty($latestVersion)
+            && version_compare(Version::VERSION, $latestVersion) == -1
+        ) {
+            return $latestVersion;
+        }
+        return false;
+    }
+}