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system/src/Grav/Common/GPM/Upgrader.php

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+<?php
+/**
+ * @package    Grav.Common.GPM
+ *
+ * @copyright  Copyright (C) 2015 - 2018 Trilby Media, LLC. All rights reserved.
+ * @license    MIT License; see LICENSE file for details.
+ */
+
+namespace Grav\Common\GPM;
+
+use Grav\Common\GPM\Remote\GravCore;
+
+/**
+ * Class Upgrader
+ *
+ * @package Grav\Common\GPM
+ */
+class Upgrader
+{
+    /**
+     * Remote details about latest Grav version
+     *
+     * @var GravCore
+     */
+    private $remote;
+
+    private $min_php;
+
+    /**
+     * Creates a new GPM instance with Local and Remote packages available
+     *
+     * @param boolean  $refresh  Applies to Remote Packages only and forces a refetch of data
+     * @param callable $callback Either a function or callback in array notation
+     * @throws \InvalidArgumentException
+     */
+    public function __construct($refresh = false, $callback = null)
+    {
+        $this->remote = new Remote\GravCore($refresh, $callback);
+    }
+
+    /**
+     * Returns the release date of the latest version of Grav
+     *
+     * @return string
+     */
+    public function getReleaseDate()
+    {
+        return $this->remote->getDate();
+    }
+
+    /**
+     * Returns the version of the installed Grav
+     *
+     * @return string
+     */
+    public function getLocalVersion()
+    {
+        return GRAV_VERSION;
+    }
+
+    /**
+     * Returns the version of the remotely available Grav
+     *
+     * @return string
+     */
+    public function getRemoteVersion()
+    {
+        return $this->remote->getVersion();
+    }
+
+    /**
+     * Returns an array of assets available to download remotely
+     *
+     * @return array
+     */
+    public function getAssets()
+    {
+        return $this->remote->getAssets();
+    }
+
+    /**
+     * Returns the changelog list for each version of Grav
+     *
+     * @param string $diff the version number to start the diff from
+     *
+     * @return array return the changelog list for each version
+     */
+    public function getChangelog($diff = null)
+    {
+        return $this->remote->getChangelog($diff);
+    }
+
+    /**
+     * Make sure this meets minimum PHP requirements
+     *
+     * @return bool
+     */
+    public function meetsRequirements()
+    {
+        $current_php_version = phpversion();
+        if (version_compare($current_php_version, $this->minPHPVersion(), '<')) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Get minimum PHP version from remote
+     *
+     * @return null
+     */
+    public function minPHPVersion()
+    {
+        if (is_null($this->min_php)) {
+            $this->min_php = $this->remote->getMinPHPVersion();
+        }
+        return $this->min_php;
+    }
+
+    /**
+     * Checks if the currently installed Grav is upgradable to a newer version
+     *
+     * @return boolean True if it's upgradable, False otherwise.
+     */
+    public function isUpgradable()
+    {
+        return version_compare($this->getLocalVersion(), $this->getRemoteVersion(), "<");
+    }
+
+    /**
+     * Checks if Grav is currently symbolically linked
+     *
+     * @return boolean True if Grav is symlinked, False otherwise.
+     */
+
+    public function isSymlink()
+    {
+        return $this->remote->isSymlink();
+    }
+}