From 510377d2cb4b12d1a421e8a88bd7edb86f223451 Mon Sep 17 00:00:00 2001
From: ArthurHoaro <arthur@hoa.ro>
Date: Tue, 12 Jan 2016 19:50:48 +0100
Subject: Introduce the Updater class which

  * contains methods designed to be run once.
  * is able to upgrade the datastore or the configuration.
  * is based on methods names, stored in a text file with ';' separator (updates.txt).
  * begins with existing function 'mergeDeprecatedConfigFile()' (options.php).
---
 application/Updater.php | 228 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 228 insertions(+)
 create mode 100644 application/Updater.php

(limited to 'application/Updater.php')

diff --git a/application/Updater.php b/application/Updater.php
new file mode 100644
index 00000000..20ae0c4d
--- /dev/null
+++ b/application/Updater.php
@@ -0,0 +1,228 @@
+<?php
+
+/**
+ * Class Updater.
+ * Used to update stuff when a new Shaarli's version is reached.
+ * Update methods are ran only once, and the stored in a JSON file.
+ */
+class Updater
+{
+    /**
+     * @var array Updates which are already done.
+     */
+    protected $doneUpdates;
+
+    /**
+     * @var array Shaarli's configuration array.
+     */
+    protected $config;
+
+    /**
+     * @var LinkDB instance.
+     */
+    protected $linkDB;
+
+    /**
+     * @var bool True if the user is logged in, false otherwise.
+     */
+    protected $isLoggedIn;
+
+    /**
+     * @var ReflectionMethod[] List of current class methods.
+     */
+    protected $methods;
+
+    /**
+     * Object constructor.
+     *
+     * @param array   $doneUpdates Updates which are already done.
+     * @param array   $config      Shaarli's configuration array.
+     * @param LinkDB  $linkDB      LinkDB instance.
+     * @param boolean $isLoggedIn  True if the user is logged in.
+     */
+    public function __construct($doneUpdates, $config, $linkDB, $isLoggedIn)
+    {
+        $this->doneUpdates = $doneUpdates;
+        $this->config = $config;
+        $this->linkDB = $linkDB;
+        $this->isLoggedIn = $isLoggedIn;
+
+        // Retrieve all update methods.
+        $class = new ReflectionClass($this);
+        $this->methods = $class->getMethods();
+    }
+
+    /**
+     * Run all new updates.
+     * Update methods have to start with 'updateMethod' and return true (on success).
+     *
+     * @return array An array containing ran updates.
+     *
+     * @throws UpdaterException If something went wrong.
+     */
+    public function update()
+    {
+        $updatesRan = array();
+
+        // If the user isn't logged in, exit without updating.
+        if ($this->isLoggedIn !== true) {
+            return $updatesRan;
+        }
+
+        if ($this->methods == null) {
+            throw new UpdaterException('Couldn\'t retrieve Updater class methods.');
+        }
+
+        foreach ($this->methods as $method) {
+            // Not an update method or already done, pass.
+            if (! startsWith($method->getName(), 'updateMethod')
+                || in_array($method->getName(), $this->doneUpdates)
+            ) {
+                continue;
+            }
+
+            try {
+                $method->setAccessible(true);
+                $res = $method->invoke($this);
+                // Update method must return true to be considered processed.
+                if ($res === true) {
+                    $updatesRan[] = $method->getName();
+                }
+            } catch (Exception $e) {
+                throw new UpdaterException($method, $e);
+            }
+        }
+
+        $this->doneUpdates = array_merge($this->doneUpdates, $updatesRan);
+
+        return $updatesRan;
+    }
+
+    /**
+     * @return array Updates methods already processed.
+     */
+    public function getDoneUpdates()
+    {
+        return $this->doneUpdates;
+    }
+
+    /**
+     * Move deprecated options.php to config.php.
+     *
+     * Milestone 0.9 (old versioning) - shaarli/Shaarli#41:
+     *    options.php is not supported anymore.
+     */
+    public function updateMethodMergeDeprecatedConfigFile()
+    {
+        $config_file = $this->config['config']['CONFIG_FILE'];
+
+        if (is_file($this->config['config']['DATADIR'].'/options.php')) {
+            include $this->config['config']['DATADIR'].'/options.php';
+
+            // Load GLOBALS into config
+            foreach ($GLOBALS as $key => $value) {
+                $this->config[$key] = $value;
+            }
+            $this->config['config']['CONFIG_FILE'] = $config_file;
+            writeConfig($this->config, $this->isLoggedIn);
+
+            unlink($this->config['config']['DATADIR'].'/options.php');
+        }
+
+        return true;
+    }
+}
+
+/**
+ * Class UpdaterException.
+ */
+class UpdaterException extends Exception
+{
+    /**
+     * @var string Method where the error occurred.
+     */
+    protected $method;
+
+    /**
+     * @var Exception The parent exception.
+     */
+    protected $previous;
+
+    /**
+     * Constructor.
+     *
+     * @param string         $message  Force the error message if set.
+     * @param string         $method   Method where the error occurred.
+     * @param Exception|bool $previous Parent exception.
+     */
+    public function __construct($message = '', $method = '', $previous = false)
+    {
+        $this->method = $method;
+        $this->previous = $previous;
+        $this->message = $this->buildMessage($message);
+    }
+
+    /**
+     * Build the exception error message.
+     *
+     * @param string $message Optional given error message.
+     *
+     * @return string The built error message.
+     */
+    private function buildMessage($message)
+    {
+        $out = '';
+        if (! empty($message)) {
+            $out .= $message . PHP_EOL;
+        }
+
+        if (! empty($this->method)) {
+            $out .= 'An error occurred while running the update '. $this->method . PHP_EOL;
+        }
+
+        if (! empty($this->previous)) {
+            $out .= '  '. $this->previous->getMessage();
+        }
+
+        return $out;
+    }
+}
+
+
+/**
+ * Read the updates file, and return already done updates.
+ *
+ * @param string $updatesFilepath Updates file path.
+ *
+ * @return array Already done update methods.
+ */
+function read_updates_file($updatesFilepath)
+{
+    if (! empty($updatesFilepath) && is_file($updatesFilepath)) {
+        $content = file_get_contents($updatesFilepath);
+        if (! empty($content)) {
+            return explode(';', $content);
+        }
+    }
+    return array();
+}
+
+/**
+ * Write updates file.
+ *
+ * @param string $updatesFilepath Updates file path.
+ * @param array  $updates         Updates array to write.
+ *
+ * @throws Exception Couldn't write version number.
+ */
+function write_updates_file($updatesFilepath, $updates)
+{
+    if (empty($updatesFilepath)) {
+        throw new Exception('Updates file path is not set, can\'t write updates.');
+    }
+
+    $res = file_put_contents($updatesFilepath, implode(';', $updates));
+    if ($res === false) {
+        throw new Exception('Unable to write updates in '. $updatesFilepath . '.');
+    }
+}
-- 
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