Add back weather bot at new location, a=chirs

diff --git a/src/examples/WeatherBot.php b/src/examples/WeatherBot.php
new file mode 100644
index 000000000..e5337a390
--- /dev/null
+++ b/src/examples/WeatherBot.php
@@ -0,0 +1,149 @@
+<?php
+/**
+ *  SeekQuarry/Yioop --
+ *  Open Source Pure PHP Search Engine, Crawler, and Indexer
+ *
+ *  Copyright (C) 2009 - 2017  Chris Pollett chris@pollett.org
+ *
+ *  LICENSE:
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *  END LICENSE
+ *
+ * @author Harika Nukala harika.nukala@sjsu.edu
+ * @package seek_quarry
+ * @subpackage examples
+ * @license http://www.gnu.org/licenses/ GPL3
+ * @link http://www.seekquarry.com/
+ * @copyright 2009 - 2017
+ * @filesource
+ */
+namespace seekquarry\yioop\examples\weatherbot;
+
+/**
+ * This class demonstrates a simple Weather Chat Bot using the Yioop
+ * ChatBot APIs for Yioop Discussion Groups.
+ * To use this bot:
+ * (1) Move this file to some folder of a web server you have access to.
+ *     Denote by some_url the url of this folder. If you point your
+ *     browser at this folder you should see a message that begins with:
+ *     There was a configuration issue with your query.
+ * (2) Create a new Yioop User.
+ * (3) Under Manage Accounts, click on the lock symbol next to Account Details
+ * (4) Check the Bot User check bot, click save.
+ * (5) Two form variables should appear: Bot Unique Token and Bot Callback URL.
+ *      Fill in a value for Bot Unique Token that matches the value set
+ *      for ACCESS_TOKEN in the code within the WeatherBot class.
+ *      Fill in some_url (as defined in step (1)) for the value of Bot Callback
+ *      URL
+ * (6) Add the the user you created in Yioop to the group that you would like
+ *     the bot to service. Let the name of this user be user_name.
+ * (7) Talk to your bot in yioop in this groups by commenting on an
+ *     already existing thread with a message beginning with @user_name.
+ */
+class WeatherBot
+{
+    /**
+     * Url of site that this bot gets weather information from
+     */
+    const WEATHER_URL = "http://query.yahooapis.com/v1/public/yql";
+    /**
+     * Token given when setting up the bot in Yioop  for callback requests
+     * This bots checks that a request from a Yioop Intance  sends
+     * a timestamp as well as the hash of this timestamp with the bot_token
+     * and post data and that these match the expected values
+     */
+    const ACCESS_TOKEN = "bot_token";
+    /**
+     * Number of seconds that the passed timestamp can differ from the current
+     * time on the WeatherBot machine.
+     */
+    const TIME_WINDOW = 60;
+    /**
+     * This is the method called to get the WeatherBot to handle an incoming
+     * HTTP request, and echo a weather realted message
+     */
+    function processRequest()
+    {
+        $result = "There was a configuration issue with your query.";
+        if ($this->checkBotToken() && !empty($_REQUEST['post']) &&
+            !empty($_REQUEST['bot_name'])) {
+            $location = filter_var($_REQUEST['post'], \FILTER_SANITIZE_STRING);
+            $location = trim(mb_strtolower($location));
+            $result = $this->getWeather($location);
+            if (empty($result)) {
+                $result = "I failed to find the weather for that location.\n".
+                    "I respond to queries in the format:\n" .
+                    " @{$_REQUEST['bot_name']} some_location";
+            }
+        }
+        echo $result;
+    }
+    /**
+     * This method is used to check a request that it comes from a site
+     * that knows the bot_token in use by this WeatherBot.
+     */
+    function checkBotToken()
+    {
+        if (!empty($_REQUEST['bot_token'])) {
+            $token_parts = explode("*", $_REQUEST['bot_token']);
+            $post = empty($_REQUEST["post"]) ? "" : $_REQUEST["post"];
+            $hash = hash("sha256", self::ACCESS_TOKEN . $token_parts[1].
+                $post);
+            if (isset($token_parts[1]) &&
+                abs(time() - $token_parts[1]) < self::TIME_WINDOW) {
+                // second check avoids timing attacks, works for > php 5.6
+                if ((!function_exists('hash_equals') &&
+                    $hash == $token_parts[0]) ||
+                    hash_equals($hash, $token_parts[0])) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+    /**
+     * Get weather information about a location
+     *
+     * @param string $location the location to get weather updates for
+     * @return string weather information
+     */
+    function getWeather($location)
+    {
+        $yql_query = "select * from weather.forecast where woeid in
+            (select woeid from geo.places(1) where text='" . $location
+            ."')";
+        $url = self::WEATHER_URL . "?q=" .
+            urlencode($yql_query) . "&format=json";
+        $ch = curl_init();
+        curl_setopt($ch, CURLOPT_URL, $url);
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+        $data = curl_exec($ch);
+        curl_close($ch);
+        $result = @json_decode($data);
+        $temp = empty($result->query->results->channel->item->condition->temp) ?
+            "" : $result->query->results->channel->item->condition->temp;
+        $text = empty($result->query->results->channel->item->condition->text) ?
+            "" : mb_strtolower(
+            $result->query->results->channel->item->condition->text);
+        if (empty($temp) || empty($text)) {
+            return "";
+        }
+        return "The weather is $temp and $text in $location.";
+    }
+}
+$bot = new WeatherBot();
+$bot->processRequest();
+