Enforced short URLs length to be 4 at least

module/Core/src/Validation/ShortUrlMetaInputFilter.php

@@ -43,7 +43,7 @@ class ShortUrlMetaInputFilter extends InputFilter
         $this->add($customSlug);
 
         $this->add($this->createPositiveNumberInput(self::MAX_VISITS));
-        $this->add($this->createPositiveNumberInput(self::SHORT_CODE_LENGTH));
+        $this->add($this->createPositiveNumberInput(self::SHORT_CODE_LENGTH, 4));
 
         $this->add($this->createBooleanInput(self::FIND_IF_EXISTS, false));
 
@@ -52,11 +52,11 @@ class ShortUrlMetaInputFilter extends InputFilter
         $this->add($domain);
     }
 
-    private function createPositiveNumberInput(string $name): Input
+    private function createPositiveNumberInput(string $name, int $min = 1): Input
     {
         $input = $this->createInput($name, false);
         $input->getValidatorChain()->attach(new Validator\Digits())
-              ->attach(new Validator\GreaterThan(['min' => 1, 'inclusive' => true]));
+              ->attach(new Validator\GreaterThan(['min' => $min, 'inclusive' => true]));
 
         return $input;
     }

module/Core/test/Entity/ShortUrlTest.php

@@ -72,6 +72,6 @@ class ShortUrlTest extends TestCase
     public function provideLengths(): iterable
     {
         yield [null, DEFAULT_SHORT_CODES_LENGTH];
-        yield from map(range(1, 10), fn (int $value) => [$value, $value]);
+        yield from map(range(4, 10), fn (int $value) => [$value, $value]);
     }
 }

module/Core/test/Model/ShortUrlMetaTest.php

@@ -44,6 +44,9 @@ class ShortUrlMetaTest extends TestCase
             ShortUrlMetaInputFilter::VALID_UNTIL => 500,
             ShortUrlMetaInputFilter::DOMAIN => 4,
         ]];
+        yield [[
+            ShortUrlMetaInputFilter::SHORT_CODE_LENGTH => 3,
+        ]];
     }
 
     /** @test */