added optional anonymous login for clients

README.md

@@ -33,6 +33,7 @@ Parameter | Example | Explanation
 `allowCreate` | true/`false` | allows creation of entries if parameter `create=true` in URL
 `restrictDomain` | true / `false` | allows admin to restrict the domain to update to a given value `domain` and/or `host`. See URL parameters for host parameter explanation
 `allowNetcupCreds` | true / `false` | allows the user to pass netcup credentials directly via the URL. URL creds will be preferred if any still exist in .env file
+`allowAnonymous` | true / `false` | allows anonymous login, recommended only if you do not store any credentials and disable logging
 
 * alternatively you can use .configure.sh to create your .env file for you (if you are on a *NIX system)
 
@@ -49,7 +50,7 @@ You can now set `allowCreate=true` in .env and pass `create=true` as URL paramet
 
 Parameter | Example | Explanation
 ---: | :--- | :---
-user | dnsupdater | username to authenticate against this script as defined in .env file
+user | dnsupdater | username to authenticate against this script as defined in .env file. If anonymous login is allowed in .env: `anonymous`
 password | secretpleasechange |password for that user as defined in .env file
 domain | home.example.com | `case A)` If `host` is not specified: the FQDN for your host
 domain | example.com | `case B)` If you want to update the @ or * record

src/Config.php

@@ -60,6 +60,11 @@ final class Config
      */
     private $allowNetcupCreds = false;
 
+    /**
+     * @var bool
+     */
+    private $allowAnonymous = false;
+
     /**
      * @var bool
      */
@@ -91,8 +96,13 @@ final class Config
     public function isValid()
     {
         return
+            (
                 !empty($this->username) &&
-            !empty($this->password) &&
+                !empty($this->password)
+            ) ||
+            (
+                $this->isAllowAnonymous()
+            ) &&
             (
                 (
                     !empty($this->apiKey) &&
@@ -202,6 +212,14 @@ final class Config
         return $this->allowNetcupCreds;
     }
 
+    /**
+     * @return bool
+     */
+    public function isAllowAnonymous()
+    {
+        return $this->allowAnonymous;
+    }
+
     /**
      * @return string
      */

src/Handler.php

@@ -58,6 +58,13 @@ final class Handler
             }
         }
 
+        if ($this->config->isAllowAnonymous()) {
+            if ($this->payload->getUser() == 'anonymous') {
+                if ($this->config->isDebug()) {
+                    $this->doLog('anonymous login by client');
+                }
+            }
+        } else {
             if (
                 $this->config->getUsername() !== $this->payload->getUser() ||
                 $this->config->getPassword() !== $this->payload->getPassword()
@@ -68,6 +75,7 @@ final class Handler
                     exit("credentials invalid\n");
                 }
             }
+        }
 
         if ($this->config->isAllowNetcupCreds()) {
             if ($this->payload->isValidNetcupCreds()) {

src/Payload.php

@@ -85,7 +85,10 @@ final class Payload
     {
         return
             !empty($this->user) &&
-            !empty($this->password) &&
+            (
+                $this->user == 'anonymous' ||
+                !empty($this->password)
+            ) &&
             !empty($this->domain) &&
             (
                 (