Generate random token during installation.

.env

@@ -21,7 +21,7 @@ MAILER_PORT=''
 ###> symfony/framework-bundle ###
 APP_ENV='dev'
 APP_DEBUG='1'
-APP_SECRET='141af65f23c7935a37b504c422f113b0'
+APP_SECRET='{{APP_SECRET}}'
 ###< symfony/framework-bundle ###
 
 ###> chamilo ###

main/install/index.php

@@ -573,6 +573,7 @@ if (isset($_POST['step2'])) {
             '{{APP_INSTALLED}}' => 1,
             '{{APP_ENCRYPT_METHOD}}' => $encryptPassForm,
             '{{APP_URL_APPEND}}' => $urlAppendPath,
+            '{{APP_SECRET}}' => generateRandomToken(),
         ];
 
         error_log('Update env file');
@@ -633,6 +634,7 @@ if (isset($_POST['step2'])) {
             '{{APP_INSTALLED}}' => 1,
             '{{APP_ENCRYPT_METHOD}}' => $encryptPassForm,
             '{{APP_URL_APPEND}}' => $urlAppendPath,
+            '{{APP_SECRET}}' => generateRandomToken(),
         ];
 
         updateEnvFile($distFile, $envFile, $params);

main/install/install.lib.php

@@ -3750,3 +3750,11 @@ function fixPostGroupIds($connection)
     }
     error_log('End - Fix work documents');
 }
+
+/**
+ * @return string
+ */
+function generateRandomToken()
+{
+    return hash('sha1', uniqid(mt_rand(), true));
+}