Validators for Form Fields

2024-07-05 13:39:02 +02:00
parent 7043d56329
commit 6bb19ad6b0
9 changed files with 262 additions and 2 deletions
@@ -0,0 +1,112 @@
+<?php
+class FieldValidator
+{
+  /*
+  * Private members
+  */
+
+  private string $name;
+  private string $value;
+  private string $type;
+  private bool $required;
+  private int $minLen;
+  private int $maxLen;
+  private string $error;
+
+  /*
+  * Constructor
+  */
+
+  public function __construct(string $name, string $value, string $type, bool $required = false, int $minLen = -1, int $maxLen = -1, string $error = "")
+  {
+    $this->name = $name;
+    $this->value = $value;
+    $this->type = $type;
+    $this->required = $required;
+    $this->minLen = $minLen;
+    $this->maxLen = $maxLen;
+    $this->error = $error;
+
+    return $this;
+  }
+
+  /*
+  * Fluent Style
+  */
+
+  public static function create(string $name, string $value, string $type)
+  {
+    return new FieldValidator($name, $value, $type);
+  }
+
+  public function isRequired()
+  {
+    $this->required = true;
+    return $this;
+  }
+
+  public function withMinLen(int $minLen)
+  {
+    $this->minLen = $minLen;
+    return $this;
+  }
+
+  public function withMaxLen(int $maxLen)
+  {
+    $this->maxLen = $maxLen;
+    return $this;
+  }
+
+  /*
+  * Getters and Setters
+  */
+
+  public function getError()
+  {
+    return $this->error;
+  }
+
+  public function getName()
+  {
+    return $this->name;
+  }
+
+  /*
+  * Methods
+  */
+
+  public function isValid()
+  {
+    if ($this->required && empty($this->value)) {
+      $this->error = "$this->name is required";
+      return false;
+    }
+
+    if ($this->minLen >= 0 && !empty($this->value) && strlen($this->value) < $this->minLen) {
+      $this->error = "$this->name requires $this->minLen characters, got " . strlen($this->value);
+      return false;
+    }
+
+    if ($this->maxLen >= 0 && !empty($this->value) && strlen($this->value) > $this->maxLen) {
+      $this->error = "$this->name allows $this->maxLen characters, got " . strlen($this->value);
+      return false;
+    }
+
+    switch ($this->type) {
+      case "email":
+        if (!filter_var($this->value, FILTER_VALIDATE_EMAIL)) {
+          $this->error = "Not a valid E-Mail";
+          return false;
+        }
+        break;
+      case "number":
+        if (!filter_var($this->value, FILTER_VALIDATE_FLOAT) || !filter_var($this->value, FILTER_VALIDATE_INT)) {
+          $this->error = "Not a valid number";
+          return false;
+        }
+        break;
+    }
+
+    return true;
+  }
+}