Contact Form 7 Strenghting

dapper.php

@@ -1239,6 +1239,110 @@ if (class_exists('WPCF7')) {
         </script>
         <?php
     }
+
+    add_filter( 'wpcf7_form_elements', 'dapper_cf7_inject_human_checkbox', 20 );
+
+    function dapper_cf7_inject_human_checkbox( $form ) {
+        if ( get_option( 'dapper_enable_cf7_human_checkbox', 'on' ) !== 'on' ) {
+            return $form;
+        }
+
+        $checkbox_html = '
+        <div class="dapper-cf7-human-check" style="margin: 1.5em 0; padding: 1em; background: #f8f9fa; border: 1px solid #ccd0d4; border-radius: 4px; text-align: center;">
+            <label style="font-size: 1.1em; cursor: pointer; user-select: none;">
+                <input type="checkbox" name="dapper_cf7_human_confirm" id="dapper_cf7_human_confirm" value="1" required style="transform: scale(1.4); margin-right: 0.8em; vertical-align: middle;">
+                I am human / not a robot
+            </label>
+            <input type="hidden" name="dapper_cf7_human_token" id="dapper_cf7_human_token" value="">
+            <input type="hidden" name="dapper_cf7_human_time" value="' . time() . '">
+            <p style="margin: 0.6em 0 0; font-size: 0.9em; color: #555;">Quick check to help stop spam. Thanks!</p>
+        </div>';
+
+        // Insert just before the submit button / </form>
+        $form = preg_replace( '/(<button[^>]*type=["\']submit["\'][^>]*>.*?<\/button>)/is', $checkbox_html . '$1', $form );
+
+        // Fallback: if no <button type="submit"> found, put before </form>
+        if ( strpos( $form, $checkbox_html ) === false ) {
+            $form = str_replace( '</form>', $checkbox_html . '</form>', $form );
+        }
+
+        return $form;
+    }
+
+    // 2. Very small JS — runs on every page that has CF7 (cheap)
+    add_action( 'wp_footer', 'dapper_cf7_human_checkbox_js', 95 );
+
+    function dapper_cf7_human_checkbox_js() {
+        // Only output if at least one CF7 form exists on page
+        if ( ! did_action( 'wpcf7_enqueue_scripts' ) ) {
+            return;
+        }
+
+        ?>
+        <script>
+        document.addEventListener('DOMContentLoaded', () => {
+            document.querySelectorAll('.wpcf7 form').forEach(form => {
+                const checkbox   = form.querySelector('#dapper_cf7_human_confirm');
+                const tokenField = form.querySelector('#dapper_cf7_human_token');
+
+                if (!checkbox || !tokenField) return;
+
+                // Enable token only when checked
+                checkbox.addEventListener('change', () => {
+                    tokenField.value = checkbox.checked
+                        ? 'cf7_human_' + Math.random().toString(36).substring(2,10) + '_' + Date.now()
+                        : '';
+                });
+
+                // Optional: disable submit until checked (stronger UX)
+                const submitBtn = form.querySelector('input[type="submit"], button[type="submit"]');
+                if (submitBtn) {
+                    submitBtn.disabled = true;
+                    checkbox.addEventListener('change', () => {
+                        submitBtn.disabled = !checkbox.checked;
+                    });
+                }
+            });
+        });
+        </script>
+        <?php
+    }
+
+    // 3. Server-side validation — block if missing / invalid / too fast
+    add_action( 'wpcf7_before_send_mail', 'dapper_cf7_validate_human_checkbox', 11, 3 );
+
+    function dapper_cf7_validate_human_checkbox( $contact_form, &$abort, $submission ) {
+        if ( get_option( 'dapper_enable_cf7_human_checkbox', 'on' ) !== 'on' ) {
+            return;
+        }
+
+        $posted = $_POST;
+
+        // A. Checkbox must be checked
+        if ( empty( $posted['dapper_cf7_human_confirm'] ) ) {
+            $abort = true;
+            $submission->add_error( 'dapper_human', __( 'Please confirm you are human.', 'dapper' ) );
+            dapper_debug_log( "CF7 #{$contact_form->id()} blocked — human checkbox not checked" );
+            return;
+        }
+
+        // B. Token must exist and look valid
+        $token = trim( $posted['dapper_cf7_human_token'] ?? '' );
+        if ( empty( $token ) || strpos( $token, 'cf7_human_' ) !== 0 || strlen( $token ) < 18 ) {
+            $abort = true;
+            $submission->add_error( 'dapper_human', __( 'Verification failed. Please try again.', 'dapper' ) );
+            dapper_debug_log( "CF7 #{$contact_form->id()} blocked — invalid/missing human token" );
+            return;
+        }
+
+        // C. Not submitted in < 4 seconds (very strong signal of bot)
+        $time = (int) ( $posted['dapper_cf7_human_time'] ?? 0 );
+        if ( $time && ( time() - $time < 4 ) ) {
+            $abort = true;
+            $submission->add_error( 'dapper_human', __( 'Submission too fast — please try again.', 'dapper' ) );
+            dapper_debug_log( "CF7 #{$contact_form->id()} blocked — human check too fast" );
+        }
+    }
 }
 
 
@@ -1433,6 +1537,10 @@ function dapper_settings_page_content() {
                 <?php checked(get_option('dapper_enable_paypal_human_check', 'on'), 'on'); ?>
                 <?php echo $paypal_forced_off ? 'disabled' : ''; ?>>
                 <?php
+                <h3>Contact Form 7 Protection</h3>
+                <label for="dapper_enable_cf7_human_checkbox">Enable "I'm human" checkbox on all CF7 forms</label>
+                <input type="checkbox" id="dapper_enable_cf7_human_checkbox" name="dapper_enable_cf7_human_checkbox"
+                <?php checked( get_option( 'dapper_enable_cf7_human_checkbox', 'on' ), 'on' ); ?>>
                 submit_button();
                 ?>
 
@@ -1673,6 +1781,7 @@ function dapper_register_settings() {
     register_setting('dapper-backup-group', 'dapper_backup_plugins');
     register_setting('dapper-backup-group', 'dapper_backup_include_media');
     register_setting('dapper-settings-group', 'dapper_enable_paypal_human_check');
+    register_setting( 'dapper-settings-group', 'dapper_enable_cf7_human_checkbox' );
     // Add other settings as needed
 }