Adds Prosopo Procaptcha support

* Adds Prosopo Procaptcha as captcha provider

src/Captcha/Captcha.php

@@ -3,22 +3,25 @@
 
 use App\Captcha\Providers\HCaptchaProvider;
 use App\Captcha\Providers\ReCaptchaProvider;
+use App\Captcha\Providers\ProcaptchaProvider;
 
 final class Captcha
 {
   public const CAPTCHA_PROVIDER_RECAPTCHA = 0;
   public const CAPTCHA_PROVIDER_HCAPTCHA = 1;
+  public const CAPTCHA_PROVIDER_PROCAPTCHA = 2;
 
   public function getProviders(): array
   {
     return [
       self::CAPTCHA_PROVIDER_RECAPTCHA => new ReCaptchaProvider(),
       self::CAPTCHA_PROVIDER_HCAPTCHA => new HCaptchaProvider(),
+      self::CAPTCHA_PROVIDER_PROCAPTCHA => new ProcaptchaProvider()
     ];
   }
 
     public function getProvider(int $provider): ?CaptchaProviderInterface
     {
         return $this->getProviders()[$provider] ?? null;
     }
-}
+}

src/Captcha/Providers/ProcaptchaProvider.php

@@ -0,0 +1,53 @@
+<?php
+namespace App\Captcha\Providers;
+
+use App\Captcha\CaptchaProviderInterface;
+
+class ProcaptchaProvider implements CaptchaProviderInterface
+{
+    private string $verifyUrl = 'https://api.procaptcha.io/siteverify';
+
+    public function validate(string $response, string $secretKey, ?string $userIp = null): bool
+    {
+        if (empty($response)) {
+            return false;
+        }
+
+        $data = [
+            'captcha' => $response,
+            'maxVerifiedTime' => 60,
+        ];
+
+        $options = [
+            'http' => [
+                'header' => "Content-type: application/x-www-form-urlencoded\r\n",
+                'method' => 'POST',
+                'content' => http_build_query($data)
+            ]
+        ];
+
+        $context = stream_context_create($options);
+        $response = file_get_contents($this->verifyUrl, false, $context);
+        if ($response === false) {
+            return false;
+        }
+
+        $result = json_decode($response);
+        return $result->success;
+    }
+
+    public function getName(): string
+    {
+        return 'Procaptcha';
+    }
+
+    public function getHomePageUrl(): string
+    {
+        return 'https://www.prosopo.io/?utm_source=phpform&utm_medium=plugin&utm_campaign=phpform';
+    }
+
+    public function getDocumentationUrl(): string
+    {
+        return 'https://github.com/prosopo/captcha/blob/main/README.md';
+    }
+}