added new rules

app/Providers/AppServiceProvider.php

@@ -2,11 +2,15 @@
 
 namespace App\Providers;
 
+use App\Rules\RequiredIfAny;
+use App\Rules\Uniqueish;
 use Illuminate\Support\ServiceProvider;
 use Exception;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Storage;
 use PDOException;
+use Illuminate\Validation\Rule;
+use Illuminate\Support\Facades\Validator;
 
 class AppServiceProvider extends ServiceProvider
 {
@@ -31,5 +35,17 @@ class AppServiceProvider extends ServiceProvider
             $public = config("filesystems.disks.{$diskName}.public", false);
             return $public;
         });
+
+        Validator::extend('uniqueish', function ($attribute, $value, $parameters, $validator) {
+            $table = $parameters[0];
+            $column = isset($parameters[1]) === true ? $parameters[1] : null;
+
+            $rule = new Uniqueish($table, $column);
+            return $rule->passes($attribute, $value);
+        });
+
+        Rule::macro('requiredIfAny', function ($table, ...$columns) {
+            return new RequiredIfAny($table, ...$columns);
+        });
     }
 }

app/Rules/RequiredIfAny.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace App\Rules;
+
+use Illuminate\Contracts\Validation\Rule;
+use Illuminate\Support\Facades\DB;
+
+class RequiredIfAny implements Rule
+{
+    /**
+     * The table name to compare.
+     *
+     * @var string
+     */
+    protected $table;
+
+    /**
+     * The column name to compare.
+     *
+     * @var string[]
+     */
+    protected $columns;
+
+
+    /**
+     * Create a new rule instance.
+     *
+     * @param string $table      The table name to compare.
+     * @param string ...$columns The column name(s) to compare.
+     * @return void
+     */
+    public function __construct(string $table, string ...$columns)
+    {
+        $this->table = $table;
+        $this->columns = $columns;
+    }
+
+    /**
+     * Determine if the validation rule passes.
+     *
+     * @param  mixed $attribute Not used.
+     * @param  mixed $value     The value to compare.
+     * @return boolean
+     */
+    public function passes(mixed $attribute, mixed $value)
+    {
+        foreach ($this->columns as $column) {
+            $result = DB::table($this->table)
+                ->where($column, '!=', '')
+                ->where($column, '!=', null)
+                ->where($attribute, '=', '')
+                ->exists();
+
+            if ($result !== null) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Get the validation error message.
+     *
+     * @return string
+     */
+    public function message()
+    {
+        return 'The :attribute field is required if any of the following fields are not empty: ' . implode(', ', $this->columns);
+    }
+}

app/Rules/Uniqueish.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace App\Rules;
+
+use Illuminate\Contracts\Validation\Rule;
+use Illuminate\Support\Facades\DB;
+
+class Uniqueish implements Rule
+{
+    /**
+     * The table name to compare.
+     *
+     * @var string
+     */
+    protected $table;
+
+    /**
+     * The column name to compare.
+     *
+     * @var string|null
+     */
+    protected $column;
+
+    /**
+     * The ID of the record to be ignored.
+     *
+     * @var integer|null
+     */
+    protected $ignoreId;
+
+
+    /**
+     * Create a new rule instance.
+     *
+     * @param string $table  The table name to compare.
+     * @param string $column The column name to compare.
+     * @return void
+     */
+    public function __construct(string $table, string $column = null)
+    {
+        $this->table = $table;
+        $this->column = $column;
+    }
+
+    /**
+     * Set the ID of the record to be ignored.
+     *
+     * @param  integer $id
+     * @return $this
+     */
+    public function ignore($id)
+    {
+        $this->ignoreId = $id;
+        return $this;
+    }
+
+    /**
+     * Determine if the validation rule passes.
+     *
+     * @param  mixed $attribute Not used.
+     * @param  mixed $value     The value to compare.
+     * @return boolean
+     */
+    public function passes(mixed $attribute, mixed $value)
+    {
+        $columnName = ($this->column ?? $attribute);
+        $similarValue = preg_replace('/[^A-Za-z]/', '', strtolower($value));
+
+        $query = DB::table($this->table)
+        ->whereRaw('LOWER(REGEXP_REPLACE(' . $columnName . ', \'[^A-Za-z]\', \'\')) = ?', [$similarValue]);
+
+        if ($this->ignoreId !== null) {
+            $query->where('id', '<>', $this->ignoreId);
+        }
+
+        $result = $query->first();
+
+        return $result === null;
+    }
+
+    /**
+     * Get the validation error message.
+     *
+     * @return string
+     */
+    public function message()
+    {
+        return 'The :attribute is similar to an existing value in the database.';
+    }
+}