mud.php

   1 <?php
   2
   3 abstract class model {
   4
   5     private $config_file = '/etc/mud.ini';
   6     private $db;
   7
   8     public function __construct() {
   9         $config = parse_ini_file($this->config_file, true);
  10         $this->db = new mysqli(
  11             $config['database']['domain'],
  12             $config['database']['user'],
  13             $config['database']['password'],
  14             $config['database']['database']);
  15         if (mysqli_connect_errno()) {
  16             echo "Problem connecting to database: ";
  17             echo mysqli_connect_error();
  18             exit();
  19         }
  20     }
  21
  22     public function query() {
  23         $args = func_get_args();
  24         $statement = $this->db->prepare(array_shift($args));
  25         if ($args) call_user_func_array(array($statement, 'bind_param'), &$args);
  26         $statement->execute();
  27         $statement->store_result();
  28         $statement->store_result();
  29         $data = $statement->result_metadata();
  30         $return = $row = $fields = array();
  31         $fields[0] = &$statement;
  32         while($field = $data->fetch_field())
  33             $fields[] = &$row[$field->name];
  34         call_user_func_array("mysqli_stmt_bind_result", $fields);
  35         $i = 0;
  36         while ($statement->fetch()) {
  37             foreach ($row as $key=>$value) $return[$i][$key] = $value;
  38             $i++;
  39         }
  40         $statement->free_result();
  41         return $return;
  42     }
  43
  44     public function insert() {
  45         $args = func_get_args();
  46         $statement = $this->db->prepare(array_shift($args));
  47         call_user_func_array(array($statement, 'bind_param'), &$args);
  48         $statement->execute();
  49         return $this->db->insert_id;
  50     }
  51
  52     public function update() {
  53         $args = func_get_args();
  54         $statement = $this->db->prepare(array_shift($args));
  55         call_user_func_array(array($statement, 'bind_param'), &$args);
  56         $statement->execute();
  57         return $this->db->insert_id;
  58     }
  59
  60 }
  61
  62 class universe {
  63     public $rows = 30;
  64     public $columns = 30;
  65     public $rooms = array();
  66
  67     public function __construct($db) {
  68         $rooms = $db->query('SELECT id,x,y,state FROM rooms');
  69         if ($rooms) {
  70             foreach ($rooms as $room) {
  71                 $this->rooms[$room['x']][$room['y']] =
  72                     array('id' => $room['id'], 'state' => $room['state']);
  73             }
  74         } else {
  75             $sql = 'INSERT INTO rooms (x,y,state) VALUES(?,?,?)';
  76             $types = 'iii';
  77             for ($x = 0; $x < $this->columns; $x++) {
  78                 $column = array();
  79                 for ($y = 0; $y < $this->rows; $y++) {
  80                     $state = (rand(0, 9) < 2 ? true : false);
  81                     $id = $db->insert($sql, $types, $x, $y, $state);
  82                     $this->rooms[$x][$y] =
  83                         array('id' => $id, 'state' => $state);
  84                 }
  85             }
  86         }
  87     }
  88
  89     public function serialize() {
  90         $serial = array();
  91         for ($x = 0; $x < $this->columns; $x++) {
  92             for ($y = 0; $y < $this->rows; $y++) {
  93                 $serial[$x][$y] = $this->rooms[$x][$y]['state'];
  94             }
  95         }
  96         return $serial;
  97     }
  98
  99 }
 100
 101 class player {
 102
 103     public $id;
 104     public $name;
 105     public $room;
 106     public $x;
 107     public $y;
 108
 109     public function __construct($db) {
 110         $player = $db->query(
 111             'SELECT players.id, players.name, players.room, rooms.x, rooms.y'
 112             . ' FROM players LEFT JOIN rooms ON players.room = rooms.id'
 113             . ' WHERE players.id = ?',
 114             'i', $_SESSION['id']
 115         );
 116         $player = $player[0];
 117         $this->id = $player['id'];
 118         $this->name = $player['name'];
 119         $this->room = $player['room'];
 120         $this->x = $player['x'];
 121         $this->y = $player['y'];
 122     }
 123
 124 }
 125
 126 class mud extends model {
 127
 128     private $universe;
 129
 130     public function __construct() {
 131         parent::__construct();
 132         session_start();
 133         $this->universe = new universe($this);
 134     }
 135
 136     private function join() {
 137         $x = $y = 0;
 138         do {
 139             $x = rand(0, count($this->universe->rooms)-1);
 140             $y = rand(0, count($this->universe->rooms[0])-1);
 141         } while ($this->universe->rooms[$x][$y]['state']);
 142         $id = $this->insert('INSERT INTO players (name,room) VALUES(?,?)',
 143                             'si', $_GET['name'], $this->universe->rooms[$x][$y]['id']);
 144         $_SESSION['id'] = $id;
 145         //$others = $this->query('SELECT id, room FROM players WHERE id != ?', 'i', $this->player->id);
 146         return array('x' => $x, 'y' => $y, 'id' => $id, 'poll' => $this->poll());
 147     }
 148
 149     private function yell($msg) {
 150         if (!$msg) $this->error('400', 'expected `msg` field');
 151         $this->insert(
 152             'INSERT INTO messages (message,type,room,source) VALUES(?,?,?,?)',
 153             'ssii', $msg, 'yell', $this->player->room, $this->player->id);
 154     }
 155
 156     private function say($msg) {
 157         if (!$msg) $this->error('400', 'expected `dest` field');
 158         $this->insert(
 159             'INSERT INTO messages (message,type,room,source) VALUES(?,?,?,?)',
 160             'ssii', $msg, 'say', $this->player->room, $this->player->id);
 161     }
 162
 163     private function tell($dest, $msg) {
 164         if (!$dest || !$msg) $this->error('400', 'expected `dest` and `msg` fields');
 165         $player = $this->query('SELECT id FROM players where name = ?', 's', $dest);
 166         if (!($player && $player['id']))
 167             $this->error('400', "could not find a player with `name` == $dest");
 168         $this->insert(
 169             'INSERT INTO messages (message,type,destination,source) VALUES(?,?,?,?)',
 170             'ssii', $msg, 'say', $player['id'], $this->player->id);
 171     }
 172
 173     private function move($direction) {
 174         $directions = array(
 175             'north' => array('x' => $this->player->x,   'y' => $this->player->y-1),
 176             'east'  => array('x' => $this->player->x+1, 'y' => $this->player->y),
 177             'south' => array('x' => $this->player->x,   'y' => $this->player->y+1),
 178             'west'  => array('x' => $this->player->x-1, 'y' => $this->player->y),
 179         );
 180         if ($directions[$direction]) {
 181             $rooms = $this->query(
 182                 'SELECT id, state, description FROM rooms WHERE x = ? and y = ?',
 183                 'ii', $directions[$direction]['x'], $directions[$direction]['y']);
 184             if ($rooms[0] && !$rooms[0]['state']) {
 185                 $this->update('UPDATE players SET room = ? WHERE players.id = ?',
 186                     'si', $rooms[0]['id'], $this->player->id);
 187                 return array('description' => $rooms[0]['description']);
 188             } else {
 189                 $this->error(403, 'your path is blocked');
 190             }
 191         } else
 192             $this->error(400, 'expected `direction` field with value {north|east|south|west}');
 193     }
 194
 195     private function poll() {
 196         $time = isset($_SESSION['last_polled']) ? $_SESSION['last_polled'] : 0;
 197         $messages = $this->query(
 198             'SELECT message, type, name, sent, players.id FROM messages LEFT JOIN players'
 199             . ' ON destination = players.id'
 200             . ' OR source = players.id'
 201             . ' WHERE TIMESTAMPDIFF(MINUTE, sent, NOW()) < 5'
 202             . ' AND UNIX_TIMESTAMP(sent) >= ?'
 203             . ' AND (type = "yell"'
 204                 . ' OR (type = "tell" AND destination = ?)'
 205                 . ' OR (type = "say" AND messages.room = ?))',
 206             'iii', $time, $this->player->id, $this->player->room);
 207         $players = $this->query(
 208             'SELECT players.id, name, x ,y '
 209             . 'FROM players JOIN rooms '
 210             . 'ON players.room = rooms.id');
 211         $_SESSION['last_polled'] = time();
 212         return array('messages' => $messages, 'players' => $players);
 213     }
 214
 215     public function response($content) {
 216         header('Content-Type: application/json');
 217         echo json_encode($content);
 218     }
 219
 220     public function command($cmd) {
 221         if (!$_GET['cmd'])
 222             $this->error(400, 'Missing command: expected `cmd` field');
 223         if ($_GET['cmd'] != 'join' && $_GET['cmd'] != 'start' && !isset($_SESSION['id']))
 224             $this->error(401, 'Missing user ID: please join first');
 225         if (isset($_SESSION['id'])) $this->player = new player($this);
 226         switch ($cmd) {
 227             case 'start':
 228                 $this->response($this->universe->serialize());
 229                 break;
 230             case 'join':
 231                 $this->response($this->join());
 232                 break;
 233             case 'move':
 234                 $this->response($this->move($_GET['direction']));
 235                 break;
 236             case 'tell':
 237                 $this->tell($_GET['msg']);
 238                 break;
 239             case 'yell':
 240                 $this->yell($_GET['msg']);
 241                 break;
 242             case 'say':
 243                 $this->say($_GET['dest'], $_GET['msg']);
 244                 break;
 245             case 'tell':
 246                 $this->tell();
 247                 break;
 248             case 'poll':
 249                 echo json_encode($this->poll());
 250                 break;
 251             default:
 252                 $this->error(400, 'Unknown command');
 253         }
 254     }
 255
 256     private function error($status, $msg) {
 257         header("HTTP/1.0 $status");
 258         echo $msg;
 259         exit;
 260     }
 261
 262 }
 263
 264 $mud = new mud();
 265 $mud->command($_GET['cmd']);
 266
 267 ?>