Merge pull request #1 from webong/main

Merge Request: (WIP) Paystack Addon for Gravity Forms v1

Author: whales-paystack

class-gf-paystack-api.php

@@ -0,0 +1,111 @@
+<?php
+if (!defined('ABSPATH')) {
+    die('You are not allowed to call this page directly.');
+}
+
+class GFPaystackApi
+{
+    private $plugin_name;
+    private $public_key;
+    private $secret_key;
+
+    public function __construct($config)
+    {
+        $this->plugin_name = 'Paystack Addon for Gravity Forms';
+        $this->secret_key = $config->secret_key ?? '';
+        $this->public_key = $config->public_key ?? '';
+    }
+
+    /**
+     * Track Payment Transactions from this Plugin
+     *
+     * @param string $trx_ref
+     * @return void
+     */
+    public function log_transaction_success($reference)
+    {
+        // Send reference to logger along with plugin name and public key
+        $params = [
+            'plugin_name'  => $this->plugin_name,
+            'public_key' => $this->public_key,
+            'transaction_reference' => $reference
+        ];
+
+        $this->send_request(
+            'log/charge_success',
+            $params,
+            'post',
+            'https://plugin-tracker.paystackintegrations.com/'
+        );
+    }
+
+    /**
+     * Send request to the Paystack Api
+     * 
+     * @param string $endpoint API request path
+     * @param array $args API request arguments
+     * @param string $method API request method
+     * @param string $domain API request uri
+     * 
+     * @return object|null JSON decoded transaction object. NULL on API error.
+     */
+    public function send_request(
+        $endpoint,
+        $args = array(),
+        $method = 'post',
+        $domain = 'https://api.paystack.co/'
+    ) {
+        $uri = "{$domain}{$endpoint}";
+
+        $arg_array = array(
+            'method'    => strtoupper($method),
+            'body'      => $args,
+            'timeout'   => 15,
+            'headers'   => $this->get_headers()
+        );
+
+        $res = wp_remote_request($uri, $arg_array);
+
+        if (is_wp_error($res)) {
+            throw new Exception(sprintf(__('You had an HTTP error connecting to %s', 'gravityformspaystack'), $this->name));
+        } 
+
+        $body = json_decode($res['body'], true);
+    
+        if ($body !== null) {
+            if (isset($json_res['error']) || $body['status'] == false) {
+                throw new Exception("{$body['message']}");
+            } else {
+                return $body;
+            }
+        } else { // Un-decipherable message
+            throw new Exception(sprintf(__('There was an issue connecting with the payment processor. Try again later.', 'gravityformspaystack'), $this->name));
+        }
+
+        return false;
+    }
+
+    /**
+     * Validate Webhook Signature
+     *
+     * @param $input
+     * @return boolean
+     */
+    public function validate_webhook($input)
+    {
+        return $_SERVER['HTTP_X_PAYSTACK_SIGNATURE'] == hash_hmac('sha512', $input, $this->secret_key);
+    }
+
+    /**
+     * Generates the headers to pass to API request.
+     */
+    public function get_headers()
+    {
+        return apply_filters(
+            'mepr_paystack_request_headers',
+            [
+                'Authorization' => "Bearer {$this->secret_key}",
+            ]
+        );
+    }
+}