Solution - Kohlíček

src/index.html

@@ -42,6 +42,13 @@ <h1 id="header">Redis chat demo</h1>
             });
         });
 
+        text.addEventListener("keyup", function (event) {
+            event.preventDefault();
+            if (event.keyCode === 13) {
+                sendBtn.click();
+            }
+        });
+
 
         setInterval(function(){
             xhr('GET', 'showMessages.php', null, function(response){

src/init.php

@@ -5,13 +5,13 @@
 
 $redis = new Predis\Client([
     'scheme' => 'tcp',
-    'host'   => 'redis',
+    'host' => 'localhost',
     'port'   => 6379,
+    'async' => false,
+    'throw_errors' => true
 ]);
 
 function loadCurentUserId($authSecret) {
-    return 1; // EXTENDED TASK: delete this line to complete the extended task
-
     global $redis;
 
     // empty auth secret means the user is logged out
@@ -20,10 +20,11 @@ function loadCurentUserId($authSecret) {
     }
 
     // use the auth secret to get the user ID
-    // $userId = _____________ (EXTENDED TASK)
+    $userId = $redis->executeRaw(["GET", "authSecret_$authSecret"]);
+
     if ($userId) {
         // cross check that this auth secret is also stored in the user hash
-        // $userAuthSecret = _____________ (EXTENDED TASK)
+        $userAuthSecret = $redis->executeRaw(["HGET", $userId, "authSecret"]);
         if ($userAuthSecret != $authSecret) {
             return null;
         }

src/login.php

@@ -1,18 +1,16 @@
 <?php
 
-exit; // EXTENDED TASK: delete this line to complete the extended task
-
 require "init.php";
 
 $username = $_POST['username'];
 $password = $_POST['password'];
 
 // lookup the user IDs by username
-// $userId = ___________________ (EXTENDED TASK)
+$userId = $redis->executeRaw(["GET", "user_$username"]);
 
 if ($userId) {
     // user ID exists => continue with the login flow
-    // $realPassword = __________________ (EXTENDED TASK)
+    $realPassword = $redis->executeRaw(["HGET", $userId, "password"]);
     if ($password === $realPassword) {
         doLogin($userId);
     } else {
@@ -23,11 +21,13 @@
 } else {
     // user ID does not exist => continue with the register flow
     // obtain new user ID
-    // $userId = _________________ (EXTENDED TASK)
+    $userId = "user_" . $redis->executeRaw(["INCR", "user_sequence"]);
+
     // store this user account into a hash
-    // ________________________ (EXTENDED TASK)
+    $redis->executeRaw(["HMSET", $userId, "username", $username, "password", "$password"]);
+
     // store the user ID into a hash - this is needed to lookup user IDs by usernames
-    // ________________________ (EXTENDED TASK)
+    $redis->executeRaw(["SET", "user_$username", $userId]);
 
     // login the user
     doLogin($userId);
@@ -41,13 +41,13 @@ function doLogin($userId) {
     $authSecret = hash('sha256', $rand);
 
     // delete the old auth secret (in case it exists)
-    // ________________________ (EXTENDED TASK)
+    $redis->executeRaw(["HDEL", $userId, "authSecret"]);
 
     // update the auth secret stored in the user hash
-    // ________________________ (EXTENDED TASK)
+    $redis->executeRaw(["HSET", $userId, "authSecret", $authSecret]);
 
     // store the user ID into a hash - this is needed to lookup user IDs by user secrets
-    // ________________________ (EXTENDED TASK)
+    $redis->executeRaw(["SET", "authSecret_$authSecret", $userId]);
 
     setcookie("auth", $authSecret, time() + 3600 * 24 * 365);
 }

src/logout.php

@@ -1,7 +1,5 @@
 <?php
 
-exit; // EXTENDED TASK: delete this line to complete the extended task
-
 require "init.php";
 
 $userId = loadCurentUserId($_COOKIE['auth']);
@@ -12,8 +10,9 @@
 }
 
 // delete the old auth secret
-// ___________________ (EXTENDED TASK)
+$redis->executeRaw(["HDEL", $userId, "authSecret"]);
+
 // set this user's auth secret to empty
-// ___________________ (EXTENDED TASK)
+$redis->executeRaw(["DEL", "authSecret_$authSecret"]);
 
 setcookie('auth', '', 1);

src/sendMessage.php

@@ -13,10 +13,11 @@
 $text = $_POST['text'];
 
 // get the ID of the message
-// $messageId = _______________ (BASIC TASK)
+$messageId = "message_" . $redis->executeRaw(["INCR", "message_sequence"]);
 
 // insert the message into its own hash
-// _______________ (BASIC TASK)
+$username = $redis->executeRaw(["HGET", $userId, "username"]);
+$redis->executeRaw(["HMSET", $messageId, "time", $time, "text", "$text", "username", $username]);
 
 // push the message into the list of message IDs
-// _______________ (BASIC TASK)
+$redis->executeRaw(["RPUSH", "messages", $messageId]);

src/showMessages.php

@@ -10,27 +10,30 @@
 }
 
 // get 10 latest messages
-// $messages = _______________ (BASIC TASK)
+$messages = $redis->executeRaw(["LRANGE", "messages", "0", "10"]);
+$messages = array_reverse($messages);
 
-foreach ($messages as $id) {
+foreach ($messages as $messageId) {
     // get all properties of the message
-    // $message = _______________ (BASIC TASK)
+    $message = [];
+    $message["text"] = $redis->executeRaw(["HGET", $messageId, "text"]);
+    $message["time"] = $redis->executeRaw(["HGET", $messageId, "time"]);
 
     // add the author's username to the message array
-    $message['username'] = 'Anonymous';
-    // $message['username'] = _____________ (EXTENDED TASK)
+    $message['username'] = $redis->executeRaw(["HGET", $messageId, "username"]);
 
     printMessage($message);
 }
 
-function printMessage(array $message) {
+function printMessage(array $message)
+{
     echo "<table style=\"width:100%\">"
-        ."<tr class='infoRow'>"
-        ."<td class='userColumn'>" . $message['username'] . "</td>"
-        ."<td class='timeColumn'>". date('m/d/Y H:i:s', $message['time']) ."</td>"
-        ."</tr>"
-        ."<tr class='messageRow'>"
-        ."<td class='messageColumn'>". $message['text'] ."</td>"
-        ."</tr>"
-        ."</table>";
+        . "<tr class='infoRow'>"
+        . "<td class='userColumn'>" . $message['username'] . "</td>"
+        . "<td class='timeColumn'>" . date('m/d/Y H:i:s', $message['time']) . "</td>"
+        . "</tr>"
+        . "<tr class='messageRow'>"
+        . "<td class='messageColumn'>" . $message['text'] . "</td>"
+        . "</tr>"
+        . "</table>";
 }