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wp-content/plugins/mailchimp-for-wp/integrations/custom/class-custom.php

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+<?php
+
+defined('ABSPATH') or exit;
+
+/**
+ * Class MC4WP_Custom_Integration
+ * @ignore
+ */
+class MC4WP_Custom_Integration extends MC4WP_Integration
+{
+    /**
+     * @var string
+     */
+    protected $checkbox_name = 'mc4wp-subscribe';
+
+    /**
+     * @var string
+     */
+    public $name = 'Custom';
+
+    /**
+     * @var string
+     */
+    public $description = 'Integrate with custom third-party forms.';
+
+    /**
+    * Add hooks
+    */
+    public function add_hooks()
+    {
+        add_action('init', array( $this, 'listen' ), 50);
+    }
+
+    /**
+     * Was the integration checkbox checked?
+     *
+     * @return bool
+     */
+    public function checkbox_was_checked()
+    {
+        $data          = $this->get_data();
+        $value         = isset($data[ $this->checkbox_name ]) ? $data[ $this->checkbox_name ] : '';
+        $truthy_values = array( 1, '1', 'yes', true, 'true', 'y' );
+        return in_array($value, $truthy_values, true);
+    }
+
+    /**
+     * Maybe fire a general subscription request
+     */
+    public function listen()
+    {
+        if (! $this->checkbox_was_checked()) {
+            return false;
+        }
+
+        $data = $this->get_data();
+
+        // don't run for CF7 or Events Manager requests
+        // (since they use the same "mc4wp-subscribe" trigger)
+        $disable_triggers = array(
+            '_wpcf7' => '',
+            'action' => 'booking_add',
+        );
+
+        foreach ($disable_triggers as $trigger => $trigger_value) {
+            if (isset($data[ $trigger ])) {
+                $value = $data[ $trigger ];
+
+                // do nothing if trigger value is optional
+                // or if trigger value matches
+                if (empty($trigger_value) || $value === $trigger_value) {
+                    return false;
+                }
+            }
+        }
+
+        // run!
+        return $this->process();
+    }
+
+    /**
+     * Process custom form
+     *
+     * @return bool|string
+     */
+    public function process()
+    {
+        $parser = new MC4WP_Field_Guesser($this->get_data());
+        $data   = $parser->combine(array( 'guessed', 'namespaced' ));
+
+        // do nothing if no email was found
+        if (empty($data['EMAIL'])) {
+            $this->get_log()->warning(sprintf('%s > Unable to find EMAIL field.', $this->name));
+            return false;
+        }
+
+        return $this->subscribe($data);
+    }
+
+    /**
+     * @return bool
+     */
+    public function is_installed()
+    {
+        return true;
+    }
+
+    /**
+     * @return array
+     */
+    public function get_ui_elements()
+    {
+        return array( 'lists', 'double_optin', 'update_existing', 'replace_interests' );
+    }
+}