refactor: add custom Exception class

src/Exception/DomainNotFoundException.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Exception;
+
+class DomainNotFoundException extends \Exception
+{
+    public static function fromDomain(string $ldhName): DomainNotFoundException
+    {
+        return new DomainNotFoundException("The domain name $ldhName is not present in the WHOIS database");
+    }
+}

src/Exception/MalformedDomainException.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Exception;
+
+class MalformedDomainException extends \Exception
+{
+    public static function fromDomain(string $ldhName): MalformedDomainException
+    {
+        return new MalformedDomainException("Domain name ($ldhName) must contain at least one dot");
+    }
+}

src/Exception/TldNotSupportedException.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Exception;
+
+class TldNotSupportedException extends \Exception
+{
+    public static function fromTld(string $tld): TldNotSupportedException
+    {
+        return new TldNotSupportedException("The requested TLD $tld is not yet supported, please try again with another one");
+    }
+}

src/Exception/UnknownRdapServerException.php

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+<?php
+
+namespace App\Exception;
+
+class UnknownRdapServerException extends \Exception
+{
+    public static function fromTld(string $tld): UnknownRdapServerException
+    {
+        return new UnknownRdapServerException("TLD $tld: Unable to determine which RDAP server to contact");
+    }
+}