Merge pull request #2 from webong/webhook

Added Webhook Support
webong · Aug 28, 2019 · 990b4f1 · 990b4f1
2 parents a38e993 + e42c33c
commit 990b4f1
Show file tree

Hide file tree

Showing 9 changed files with 507 additions and 357 deletions.
diff --git a/classes/Paystack.php b/classes/Paystack.php
@@ -0,0 +1,157 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+/**
+ * Paystack API Class
+ *
+ * @package    enrol_paystack
+ * @copyright  2019 Paystack
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace enrol_paystack;
+
+defined('MOODLE_INTERNAL') || die();
+
+class paystack {
+    public $plugin_name;
+    public $public_key;
+    public $secret_key;
+
+    public function __construct($plugin, $pk, $sk){
+        //configure plugin name
+        //configure public key
+        $this->base_url = "https://api.paystack.co/";
+        $this->plugin_name = $plugin;
+        $this->public_key = $pk;
+        $this->secret_key = $sk;
+    }
+
+     /**
+     * Verify Payment Transaction
+     *
+     * @param string $reference
+     * @param array $data
+     * @return void
+     */
+    public function initialize_transaction($data)
+    {
+        $paystackUrl = $this->base_url . "transaction/initialize";
+
+        $curl = curl_init();
+        curl_setopt_array($curl, [
+            CURLOPT_URL => $paystackUrl,
+            CURLOPT_CUSTOMREQUEST => "POST",
+            CURLOPT_POSTFIELDS => $data,
+            CURLOPT_RETURNTRANSFER => true,
+            CURLOPT_HTTPHEADER => [
+                "authorization: Bearer " . $this->secret_key,
+                "content-type: application/json",
+                "cache-control: no-cache"
+            ],
+        ]);
+
+        $request = curl_exec($curl);
+        $res = json_decode($request, true);
+
+        if (curl_errno($curl)) {
+            throw new moodle_exception(
+                'errpaystackconnect',
+                'enrol_paystack',
+                '',
+                array('url' => $paystackUrl, 'response' => $res),
+                json_encode($data)
+            );
+        }
+
+        curl_close($curl);
+
+        return $res;
+    }
+
+     /**
+     * Verify Payment Transaction
+     *
+     * @param string $reference
+     * @return void
+     */
+    public function verify_transaction($reference)
+    {
+        $paystackUrl = $this->base_url . "transaction/verify/" . $reference;
+
+        $curl = curl_init();
+        curl_setopt_array($curl, [
+            CURLOPT_URL => $paystackUrl,
+            CURLOPT_RETURNTRANSFER => true,
+            CURLOPT_CUSTOMREQUEST => "GET",
+            CURLOPT_HTTPHEADER => [
+                "authorization: Bearer " . $this->secret_key,
+                "content-type: application/json",
+                "cache-control: no-cache"
+            ],
+        ]);
+
+        $request = curl_exec($curl);
+        $res = json_decode($request, true);
+        // $code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
+
+        if (curl_errno($curl)) {
+            throw new moodle_exception(
+                'errpaystackconnect',
+                'enrol_paystack',
+                '',
+                array('url' => $paystackUrl, 'response' => $res),
+                ''
+            );
+        }
+
+        curl_close($curl);
+
+        return $res;
+    }
+
+    /**
+     * 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
+        $url = "https://plugin-tracker.paystackintegrations.com/log/charge_success";
+        $params = [
+            'plugin_name'  => $this->plugin_name,
+            'transaction_reference' => $reference,
+            'public_key' => $this->public_key
+        ];
+        $params_string = http_build_query($params);
+        $ch = curl_init();
+        curl_setopt($ch,CURLOPT_URL, $url);
+        curl_setopt($ch,CURLOPT_POST, true);
+        curl_setopt($ch,CURLOPT_POSTFIELDS, $params_string);
+        curl_setopt($ch,CURLOPT_RETURNTRANSFER, true); 
+        //execute post
+        curl_exec($ch);
+    }
+
+    /**
+     * 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);
+    }
+}
diff --git a/classes/paystack_plugin_tracker.php b/classes/paystack_plugin_tracker.php
diff --git a/enrol.html b/enrol.html
@@ -3,36 +3,38 @@ <h3><?php echo $instancename; ?></h3>
     <p><?php echo $message; ?></p>
     <p><b><?php echo get_string("cost").": {$instance->currency} {$localisedcost}"; ?></b></p>
     <div>
-
+        <?php
+            $data = [
+                "cmd" => "_xclick",
+                "charset" => "utf-8",
+                "item_name" => s($coursefullname),
+                "item_name" => s($coursefullname),
+                "item_number" => s($courseshortname),
+                "quantity" => "1",
+                "on0" => get_string("user"),
+                "os0" => s($userfullname),
+                "custom" => "{$USER->id}-{$course->id}-{$instance->id}",
+                "currency_code" => $instance->currency,
+                "amount" => $cost,
+                "for_auction" => "false",
+                "no_note" => "1",
+                "no_shipping" => "1" ,
+                "rm" => "2",
+                "first_name" => s($userfirstname),
+                "last_name" => s($userlastname),
+                "email" => s($useremail),
+                "reference" => $reference,
+            ];
+        ?>
         <form method="post" action="<?php echo "$CFG->wwwroot/enrol/paystack/verify.php"?>">
             <input type="hidden" name="cmd" value="_xclick" />
             <input type="hidden" name="charset" value="utf-8" />
-            <input type="hidden" name="item_name" value="<?php p($coursefullname) ?>" />
-            <input type="hidden" name="item_number" value="<?php p($courseshortname) ?>" />
-            <input type="hidden" name="quantity" value="1" />
-            <input type="hidden" name="on0" value="<?php print_string("user") ?>" />
-            <input type="hidden" name="os0" value="<?php p($userfullname) ?>" />
             <input type="hidden" name="custom" value="<?php echo "{$USER->id}-{$course->id}-{$instance->id}" ?>" />
-            <input type="hidden" name="currency_code" value="<?php p($instance->currency) ?>" />
-            <input type="hidden" name="amount" value="<?php p($cost) ?>" />
-            <input type="hidden" name="for_auction" value="false" />
-            <input type="hidden" name="no_note" value="1" />
-            <input type="hidden" name="no_shipping" value="1" />
-            <input type="hidden" name="rm" value="2" />
-            <input type="hidden" name="cbt" value="<?php print_string("continuetocourse") ?>" />
-            <input type="hidden" name="first_name" value="<?php p($userfirstname) ?>" />
-            <input type="hidden" name="last_name" value="<?php p($userlastname) ?>" />
-            <input type="hidden" name="email" value="<?php p($USER->email) ?>" />
-            <script 
-                src="https://js.paystack.co/v1/inline.js" 
-                data-label="<?php echo get_string('btntext','enrol_paystack') ?>"
-                data-key="<?php echo $publickey; ?>"
-                data-ref="<?php echo $reference; ?>" 
-                data-email="<?php p($USER->email) ?>"
-                data-description="Enrolment Cost (<?php p($instance->currency) ?><?php p($cost) ?>)" 
-                data-currency="<?php p($instance->currency) ?>" 
-                data-amount="<?php p($cost * 100) ?>"
-                data-locale="<?php echo current_language(); ?>">
+
+            <script src="https://js.paystack.co/v1/inline.js" data-key="<?php echo $publickey; ?>"
+                data-ref="<?php echo $reference; ?>" data-email="<?php p($useremail) ?>"
+                data-currency="<?php p($instance->currency) ?>" data-amount="<?php p($cost * 100) ?>"
+                data-metadata='<?php echo json_encode($data) ?>' data-locale="<?php echo current_language(); ?>">
             </script>
         </form>
 

diff --git a/lang/en/enrol_paystack.php b/lang/en/enrol_paystack.php
@@ -70,8 +70,8 @@
 $string['paystack:unenrol'] = 'Unenrol users from course';
 $string['paystack:unenrolself'] = 'Unenrol self from the course';
 $string['paystackaccepted'] = 'Paystack payments accepted';
-$string['pluginname'] = 'Paystack Payment';
-$string['pluginname_desc'] = 'The Paystack module allows you to set up paid courses.  If the cost for any course is zero, then students are not asked to pay for entry.  There is a site-wide cost that you set here as a default for the whole site and then a course setting that you can set for each course individually. The course cost overrides the site cost.';
+$string['pluginname'] = 'Paystack';
+$string['pluginname_desc'] = 'The Paystack module allows you to set up paid courses. If the cost for any course is zero, then students are not asked to pay for entry.  There is a site-wide cost that you set here as a default for the whole site and then a course setting that you can set for each course individually. The course cost overrides the site cost.';
 $string['sendpaymentbutton'] = 'Send payment via Paystack';
 $string['status'] = 'Allow Paystack enrolments';
 $string['status_desc'] = 'Allow users to use Paystack to enrol into a course by default.';
@@ -94,3 +94,5 @@
 $string['charge_description1'] = "Create customer for email receipt";
 $string['charge_description2'] = 'Charge for Course Enrolment Cost.';
 $string['paystack_sorry'] = "Sorry, you can not use the script that way.";
+$string['webhook'] = 'Paystack Webhook Url';
+$string['webhook_desc'] = 'Add this Webhook Url "{$a->webhook}" to your paystack account developer settings page <a href="{$a->url}">here</a>';
diff --git a/lib.php b/lib.php
@@ -397,10 +397,12 @@ public function enrol_page_hook(stdClass $instance)
                 $userfullname    = fullname($USER);
                 $userfirstname   = $USER->firstname;
                 $userlastname    = $USER->lastname;
+                $useremail       = $USER->email;
                 $instancename    = $this->get_instance_name($instance);
 
                 $publickey = $this->get_publickey();
                 $reference = $this->getHashedToken();
+
                 include($CFG->dirroot.'/enrol/paystack/enrol.html');
             }
         }

diff --git a/settings.php b/settings.php
@@ -31,11 +31,16 @@
 /** Paystack live mode enabled.*/
 define('LIVE_MODE_ENABLED', 1);
 
+global $CFG;
+
 if ($ADMIN->fulltree) {
+    $webhook = "$CFG->wwwroot/enrol/paystack/webhook.php";
+    $url = "https://dashboard.paystack.com/#/settings/developer";
+    $text = '<p>Add this Webhook Url <span style="color:blue; text-decoration:underline;">' . $webhook . '</span> to your paystack account developer settings page <a href="' . $url .'" target="_blank">here</a></p>';
     $settings->add(new admin_setting_heading(
         'enrol_paystack_enrolname_short',
         '',
-        get_string('pluginname_desc', 'enrol_paystack')
+        get_string('pluginname_desc', 'enrol_paystack') . " " . $text
     ));
 
     $options = array(
@@ -111,10 +116,10 @@
         ENROL_EXT_REMOVED_UNENROL        => get_string('extremovedunenrol', 'enrol'),
     );
     $settings->add(new admin_setting_configselect(
-        'enrol_paystack/expiredaction', 
-        get_string('expiredaction', 'enrol_paystack'), 
-        get_string('expiredaction_help', 'enrol_paystack'), 
-        ENROL_EXT_REMOVED_SUSPENDNOROLES, 
+        'enrol_paystack/expiredaction',
+        get_string('expiredaction', 'enrol_paystack'),
+        get_string('expiredaction_help', 'enrol_paystack'),
+        ENROL_EXT_REMOVED_SUSPENDNOROLES,
         $options
     ));