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base/vendor/codeigniter4/framework/system/Honeypot/Exceptions/HoneypotException.php

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+<?php
+
+declare(strict_types=1);
+
+/**
+ * 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;
+
+class HoneypotException extends ConfigException
+{
+    /**
+     * Thrown when the template value of config is empty.
+     *
+     * @return static
+     */
+    public static function forNoTemplate()
+    {
+        return new static(lang('Honeypot.noTemplate'));
+    }
+
+    /**
+     * Thrown when the name value of config is empty.
+     *
+     * @return static
+     */
+    public static function forNoNameField()
+    {
+        return new static(lang('Honeypot.noNameField'));
+    }
+
+    /**
+     * Thrown when the hidden value of config is false.
+     *
+     * @return static
+     */
+    public static function forNoHiddenValue()
+    {
+        return new static(lang('Honeypot.noHiddenValue'));
+    }
+
+    /**
+     * Thrown when there are no data in the request of honeypot field.
+     *
+     * @return static
+     */
+    public static function isBot()
+    {
+        return new static(lang('Honeypot.theClientIsABot'));
+    }
+}

base/vendor/codeigniter4/framework/system/Honeypot/Honeypot.php

@@ -0,0 +1,121 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * 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\IncomingRequest;
+use CodeIgniter\HTTP\RequestInterface;
+use CodeIgniter\HTTP\ResponseInterface;
+use Config\Honeypot as HoneypotConfig;
+
+/**
+ * class Honeypot
+ *
+ * @see \CodeIgniter\Honeypot\HoneypotTest
+ */
+class Honeypot
+{
+    /**
+     * Our configuration.
+     *
+     * @var HoneypotConfig
+     */
+    protected $config;
+
+    /**
+     * Constructor.
+     *
+     * @throws HoneypotException
+     */
+    public function __construct(HoneypotConfig $config)
+    {
+        $this->config = $config;
+
+        if ($this->config->container === '' || ! str_contains($this->config->container, '{template}')) {
+            $this->config->container = '<div style="display:none">{template}</div>';
+        }
+
+        $this->config->containerId ??= 'hpc';
+
+        if ($this->config->template === '') {
+            throw HoneypotException::forNoTemplate();
+        }
+
+        if ($this->config->name === '') {
+            throw HoneypotException::forNoNameField();
+        }
+    }
+
+    /**
+     * Checks the request if honeypot field has data.
+     *
+     * @return bool
+     */
+    public function hasContent(RequestInterface $request)
+    {
+        assert($request instanceof IncomingRequest);
+
+        return ! empty($request->getPost($this->config->name));
+    }
+
+    /**
+     * Attaches Honeypot template to response.
+     *
+     * @return void
+     */
+    public function attachHoneypot(ResponseInterface $response)
+    {
+        if ($response->getBody() === null) {
+            return;
+        }
+
+        if ($response->getCSP()->enabled()) {
+            // Add id attribute to the container tag.
+            $this->config->container = str_ireplace(
+                '>{template}',
+                ' id="' . $this->config->containerId . '">{template}',
+                $this->config->container,
+            );
+        }
+
+        $prepField = $this->prepareTemplate($this->config->template);
+
+        $bodyBefore = $response->getBody();
+        $bodyAfter  = str_ireplace('</form>', $prepField . '</form>', $bodyBefore);
+
+        if ($response->getCSP()->enabled() && ($bodyBefore !== $bodyAfter)) {
+            // Add style tag for the container tag in the head tag.
+            $style     = '<style ' . csp_style_nonce() . '>#' . $this->config->containerId . ' { display:none }</style>';
+            $bodyAfter = str_ireplace('</head>', $style . '</head>', $bodyAfter);
+        }
+
+        $response->setBody($bodyAfter);
+    }
+
+    /**
+     * 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;
+    }
+}