init

app/ValidationRules/RestrictedIPAddressesRule.php

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+<?php
+
+namespace App\ValidationRules;
+
+use Illuminate\Contracts\Validation\Rule;
+
+class RestrictedIPAddressesRule implements Rule
+{
+    /**
+     * Determine if the validation rule passes.
+     *
+     * @param  string  $attribute
+     * @param  mixed  $value
+     * @return bool
+     */
+    public function passes($attribute, $value)
+    {
+        return ! in_array($value, config('core.restricted_ip_addresses'));
+    }
+
+    /**
+     * @return array|\Illuminate\Contracts\Translation\Translator|string|null
+     */
+    public function message()
+    {
+        return __('IP address is restricted.');
+    }
+}