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Standalone View

				<?php

				namespace App\Rules;

				use Illuminate\Contracts\Validation\Rule;
				use Illuminate\Support\Facades\Validator;
				use Illuminate\Support\Str;

				class FileName implements Rule
				{
				private $message;
				private $owner;

				/**
				* Class constructor.
				*
				* @param \App\User $owner The file owner
				*/
				public function __construct($owner)
				{
				$this->owner = $owner;
				}

				/**
				* Determine if the validation rule passes.
				*
				* @param string $attribute Attribute name
				* @param mixed $name The value to validate
				*
				* @return bool
				*/
				public function passes($attribute, $name): bool
				{
				if (empty($name) \|\| !is_string($name)) {
				$this->message = \trans('validation.file-name-invalid');
				return false;
				}

				// Check the max length, according to the database column length
				if (strlen($name) > 512) {
				$this->message = \trans('validation.max.string', ['max' => 512]);
				return false;
				}

				// Non-allowed characters
				if (preg_match('\|[\x00-\x1F\/*"\x7F]\|', $name)) {
				$this->message = \trans('validation.file-name-invalid');
				return false;
				}

				// Leading/trailing spaces, or all spaces
				if (preg_match('\|^\s+$\|', $name) \|\| preg_match('\|^\s+\|', $name) \|\| preg_match('\|\s+$\|', $name)) {
				$this->message = \trans('validation.file-name-invalid');
				return false;
				}

				// FIXME: Should we require a dot?

				// Check if the name is unique
				$exists = $this->owner->files()->where('name', $name)->exists();

				if ($exists) {
				$this->message = \trans('validation.file-name-exists');
				return false;
				}

				return true;
				}

				/**
				* Get the validation error message.
				*
				* @return string
				*/
				public function message(): ?string
				{
				return $this->message;
				}
				}