From 5c7f2f17f9c471d306955df457c7cab4e5c6ed3b Mon Sep 17 00:00:00 2001
From: Snap <snapwilliam@gmail.com>
Date: Thu, 16 Apr 2015 14:51:26 -0700
Subject: Google's OpenID Connect method $google_client_id &
 $google_client_secret must be added to db.inc.php!

---
 .../src/Google/Task/Runner.php                     | 257 +++++++++++++++++++++
 1 file changed, 257 insertions(+)
 create mode 100644 includes/google-api-php-client-master/src/Google/Task/Runner.php

(limited to 'includes/google-api-php-client-master/src/Google/Task/Runner.php')

diff --git a/includes/google-api-php-client-master/src/Google/Task/Runner.php b/includes/google-api-php-client-master/src/Google/Task/Runner.php
new file mode 100644
index 0000000..8851f5f
--- /dev/null
+++ b/includes/google-api-php-client-master/src/Google/Task/Runner.php
@@ -0,0 +1,257 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+if (!class_exists('Google_Client')) {
+  require_once dirname(__FILE__) . '/../autoload.php';
+}
+
+/**
+ * A task runner with exponential backoff support.
+ *
+ * @see https://developers.google.com/drive/web/handle-errors#implementing_exponential_backoff
+ */
+class Google_Task_Runner
+{
+  /**
+   * @var integer $maxDelay The max time (in seconds) to wait before a retry.
+   */
+  private $maxDelay = 60;
+  /**
+   * @var integer $delay The previous delay from which the next is calculated.
+   */
+  private $delay = 1;
+
+  /**
+   * @var integer $factor The base number for the exponential back off.
+   */
+  private $factor = 2;
+  /**
+   * @var float $jitter A random number between -$jitter and $jitter will be
+   * added to $factor on each iteration to allow for a better distribution of
+   * retries.
+   */
+  private $jitter = 0.5;
+
+  /**
+   * @var integer $attempts The number of attempts that have been tried so far.
+   */
+  private $attempts = 0;
+  /**
+   * @var integer $maxAttempts The max number of attempts allowed.
+   */
+  private $maxAttempts = 1;
+
+  /**
+   * @var Google_Client $client The current API client.
+   */
+  private $client;
+
+  /**
+   * @var string $name The name of the current task (used for logging).
+   */
+  private $name;
+  /**
+   * @var callable $action The task to run and possibly retry.
+   */
+  private $action;
+  /**
+   * @var array $arguments The task arguments.
+   */
+  private $arguments;
+
+  /**
+   * Creates a new task runner with exponential backoff support.
+   *
+   * @param Google_Client $client The current API client
+   * @param string $name The name of the current task (used for logging)
+   * @param callable $action The task to run and possibly retry
+   * @param array $arguments The task arguments
+   * @throws Google_Task_Exception when misconfigured
+   */
+  public function __construct(
+      Google_Client $client,
+      $name,
+      $action,
+      array $arguments = array()
+  ) {
+    $config = (array) $client->getClassConfig('Google_Task_Runner');
+
+    if (isset($config['initial_delay'])) {
+      if ($config['initial_delay'] < 0) {
+        throw new Google_Task_Exception(
+            'Task configuration `initial_delay` must not be negative.'
+        );
+      }
+
+      $this->delay = $config['initial_delay'];
+    }
+
+    if (isset($config['max_delay'])) {
+      if ($config['max_delay'] <= 0) {
+        throw new Google_Task_Exception(
+            'Task configuration `max_delay` must be greater than 0.'
+        );
+      }
+
+      $this->maxDelay = $config['max_delay'];
+    }
+
+    if (isset($config['factor'])) {
+      if ($config['factor'] <= 0) {
+        throw new Google_Task_Exception(
+            'Task configuration `factor` must be greater than 0.'
+        );
+      }
+
+      $this->factor = $config['factor'];
+    }
+
+    if (isset($config['jitter'])) {
+      if ($config['jitter'] <= 0) {
+        throw new Google_Task_Exception(
+            'Task configuration `jitter` must be greater than 0.'
+        );
+      }
+
+      $this->jitter = $config['jitter'];
+    }
+
+    if (isset($config['retries'])) {
+      if ($config['retries'] < 0) {
+        throw new Google_Task_Exception(
+            'Task configuration `retries` must not be negative.'
+        );
+      }
+      $this->maxAttempts += $config['retries'];
+    }
+
+    if (!is_callable($action)) {
+        throw new Google_Task_Exception(
+            'Task argument `$action` must be a valid callable.'
+        );
+    }
+
+    $this->name = $name;
+    $this->client = $client;
+    $this->action = $action;
+    $this->arguments = $arguments;
+  }
+
+  /**
+   * Checks if a retry can be attempted.
+   *
+   * @return boolean
+   */
+  public function canAttmpt()
+  {
+    return $this->attempts < $this->maxAttempts;
+  }
+
+  /**
+   * Runs the task and (if applicable) automatically retries when errors occur.
+   *
+   * @return mixed
+   * @throws Google_Task_Retryable on failure when no retries are available.
+   */
+  public function run()
+  {
+    while ($this->attempt()) {
+      try {
+        return call_user_func_array($this->action, $this->arguments);
+      } catch (Google_Task_Retryable $exception) {
+        $allowedRetries = $exception->allowedRetries();
+
+        if (!$this->canAttmpt() || !$allowedRetries) {
+          throw $exception;
+        }
+
+        if ($allowedRetries > 0) {
+          $this->maxAttempts = min(
+              $this->maxAttempts,
+              $this->attempts + $allowedRetries
+          );
+        }
+      }
+    }
+  }
+
+  /**
+   * Runs a task once, if possible. This is useful for bypassing the `run()`
+   * loop.
+   *
+   * NOTE: If this is not the first attempt, this function will sleep in
+   * accordance to the backoff configurations before running the task.
+   *
+   * @return boolean
+   */
+  public function attempt()
+  {
+    if (!$this->canAttmpt()) {
+      return false;
+    }
+
+    if ($this->attempts > 0) {
+      $this->backOff();
+    }
+
+    $this->attempts++;
+    return true;
+  }
+
+  /**
+   * Sleeps in accordance to the backoff configurations.
+   */
+  private function backOff()
+  {
+    $delay = $this->getDelay();
+
+    $this->client->getLogger()->debug(
+        'Retrying task with backoff',
+        array(
+            'request' => $this->name,
+            'retry' => $this->attempts,
+            'backoff_seconds' => $delay
+        )
+    );
+
+    usleep($delay * 1000000);
+  }
+
+  /**
+   * Gets the delay (in seconds) for the current backoff period.
+   *
+   * @return float
+   */
+  private function getDelay()
+  {
+    $jitter = $this->getJitter();
+    $factor = $this->attempts > 1 ? $this->factor + $jitter : 1 + abs($jitter);
+
+    return $this->delay = min($this->maxDelay, $this->delay * $factor);
+  }
+
+  /**
+   * Gets the current jitter (random number between -$this->jitter and
+   * $this->jitter).
+   *
+   * @return float
+   */
+  private function getJitter()
+  {
+    return $this->jitter * 2 * mt_rand() / mt_getrandmax() - $this->jitter;
+  }
+}
-- 
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