Initial

system/Honeypot/Exceptions/HoneypotException.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Honeypot\Exceptions;
+
+use CodeIgniter\Exceptions\ConfigException;
+use CodeIgniter\Exceptions\ExceptionInterface;
+
+class HoneypotException extends ConfigException implements ExceptionInterface
+{
+    public static function forNoTemplate()
+    {
+        return new static(lang('Honeypot.noTemplate'));
+    }
+
+    public static function forNoNameField()
+    {
+        return new static(lang('Honeypot.noNameField'));
+    }
+
+    public static function forNoHiddenValue()
+    {
+        return new static(lang('Honeypot.noHiddenValue'));
+    }
+
+    public static function isBot()
+    {
+        return new static(lang('Honeypot.theClientIsABot'));
+    }
+}

system/Honeypot/Honeypot.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Honeypot;
+
+use CodeIgniter\Honeypot\Exceptions\HoneypotException;
+use CodeIgniter\HTTP\RequestInterface;
+use CodeIgniter\HTTP\ResponseInterface;
+use Config\Honeypot as HoneypotConfig;
+
+/**
+ * class Honeypot
+ */
+class Honeypot
+{
+    /**
+     * Our configuration.
+     *
+     * @var HoneypotConfig
+     */
+    protected $config;
+
+    /**
+     * Constructor.
+     *
+     * @throws HoneypotException
+     */
+    public function __construct(HoneypotConfig $config)
+    {
+        $this->config = $config;
+
+        if (! $this->config->hidden) {
+            throw HoneypotException::forNoHiddenValue();
+        }
+
+        if (empty($this->config->container) || strpos($this->config->container, '{template}') === false) {
+            $this->config->container = '<div style="display:none">{template}</div>';
+        }
+
+        if ($this->config->template === '') {
+            throw HoneypotException::forNoTemplate();
+        }
+
+        if ($this->config->name === '') {
+            throw HoneypotException::forNoNameField();
+        }
+    }
+
+    /**
+     * Checks the request if honeypot field has data.
+     */
+    public function hasContent(RequestInterface $request)
+    {
+        return ! empty($request->getPost($this->config->name));
+    }
+
+    /**
+     * Attaches Honeypot template to response.
+     */
+    public function attachHoneypot(ResponseInterface $response)
+    {
+        $prepField = $this->prepareTemplate($this->config->template);
+
+        $body = $response->getBody();
+        $body = str_ireplace('</form>', $prepField . '</form>', $body);
+        $response->setBody($body);
+    }
+
+    /**
+     * Prepares the template by adding label
+     * content and field name.
+     */
+    protected function prepareTemplate(string $template): string
+    {
+        $template = str_ireplace('{label}', $this->config->label, $template);
+        $template = str_ireplace('{name}', $this->config->name, $template);
+
+        if ($this->config->hidden) {
+            $template = str_ireplace('{template}', $template, $this->config->container);
+        }
+
+        return $template;
+    }
+}