Set minimal score for validation (#64)

src/DI/ReCaptchaExtension.php

@@ -18,6 +18,7 @@ public function getConfigSchema(): Schema
 		return Expect::structure([
 			'siteKey' => Expect::string()->required(),
 			'secretKey' => Expect::string()->required(),
+			'minimalScore' => Expect::anyOf(Expect::float()->min(0)->max(1), Expect::int()->min(0)->max(1))->default(0),
 		]);
 	}
 
@@ -30,7 +31,7 @@ public function loadConfiguration(): void
 		$builder = $this->getContainerBuilder();
 
 		$builder->addDefinition($this->prefix('provider'))
-			->setFactory(ReCaptchaProvider::class, [$config['siteKey'], $config['secretKey']]);
+			->setFactory(ReCaptchaProvider::class, [$config['siteKey'], $config['secretKey'], $config['minimalScore']]);
 	}
 
 	/**

src/Forms/InvisibleReCaptchaField.php

@@ -2,6 +2,7 @@
 
 namespace Contributte\ReCaptcha\Forms;
 
+use Contributte\ReCaptcha\Exceptions\InvalidScoreException;
 use Contributte\ReCaptcha\ReCaptchaProvider;
 use Nette\Forms\Controls\HiddenField;
 use Nette\Forms\Form;
@@ -46,6 +47,17 @@ public function setMessage(string $message): self
 		return $this;
 	}
 
+	public function setMinimalScore(float $score): self
+	{
+		if ($score < 0 || $score > 1) {
+			throw new \LogicException('Minimal score expects to be in range 0..1 (1.0 is very likely a good interaction, 0.0 is very likely a bot).');
+		}
+
+		$this->provider->setMinimalScore($score);
+
+		return $this;
+	}
+
 	public function validate(): void
 	{
 		$this->configureValidation();

src/ReCaptchaProvider.php

@@ -28,10 +28,14 @@ class ReCaptchaProvider
 
 	private string $secretKey;
 
-	public function __construct(string $siteKey, string $secretKey)
+	// Range 0..1 (1.0 is very likely a good interaction, 0.0 is very likely a bot)
+	private float $minimalScore;
+
+	public function __construct(string $siteKey, string $secretKey, float $minimalScore)
 	{
 		$this->siteKey = $siteKey;
 		$this->secretKey = $secretKey;
+		$this->setMinimalScore($minimalScore);
 	}
 
 	public function getSiteKey(): string
@@ -57,7 +61,7 @@ public function validate(string $response): ?ReCaptchaResponse
 		$answer = json_decode($response, true);
 
 		// Return response
-		return $answer['success'] === true ? new ReCaptchaResponse(true) : new ReCaptchaResponse(false, $answer['error-codes'] ?? null);
+		return $answer['success'] === true && $answer['score'] >= $this->minimalScore ? new ReCaptchaResponse(true) : new ReCaptchaResponse(false, $answer['error-codes'] ?? null);
 	}
 
 	public function validateControl(BaseControl $control): bool
@@ -77,6 +81,11 @@ public function validateControl(BaseControl $control): bool
 		return false;
 	}
 
+	public function setMinimalScore(float $score): void
+	{
+		$this->minimalScore = $score;
+	}
+
 	protected function makeRequest(?string $response, ?string $remoteIp = null): string|null
 	{
 		if ($response === null || $response === '') {