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1<?php
2
3namespace MediaWiki\Extension\SendGrid;
4
5use Exception;
6use FormatJson;
7use MailAddress;
8use MediaWiki\Hook\AlternateUserMailerHook;
9use MWException;
10use RequestContext;
11use SendGrid;
12use SendGrid\Mail\Mail;
13use SendGrid\Mail\TypeException;
14use Status;
15
16/**
17 * Hooks for SendGrid extension for MediaWiki
18 *
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License along
30 * with this program; if not, write to the Free Software Foundation, Inc.,
31 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
32 * http://www.gnu.org/copyleft/gpl.html
33 *
34 * @file
35 * @author Derick Alangi <alangiderick@gmail.com>
36 * @license GPL-2.0-or-later
37 *
38 * @link https://www.mediawiki.org/wiki/Extension:SendGrid Documentation
39 * @ingroup Extensions
40 */
41class SGHooks implements AlternateUserMailerHook {
42
43    /**
44     * @internal For use to get the SendGrid API key
45     * @var string
46     */
47    public const SENDGRID_API_KEY = 'SendGridAPIKey';
48
49    private const RESPONSE_CODE_OK = 202;
50
51    /**
52     * Hook handler to send e-mails
53     *
54     * @param array $headers
55     * @param array $to
56     * @param MailAddress $from
57     * @param string $subject
58     * @param string $body
59     *
60     * @return bool|void|string
61     * @throws MWException|TypeException
62     */
63    public function onAlternateUserMailer( $headers, $to, $from, $subject, $body ) {
64        $conf = RequestContext::getMain()->getConfig();
65
66        $sendgridAPIKey = $conf->get( self::SENDGRID_API_KEY );
67
68        if ( $sendgridAPIKey === '' || !isset( $sendgridAPIKey ) ) {
69            throw new MWException(
70                'Please update your LocalSettings.php with the correct SendGrid API key.'
71            );
72        }
73
74        $sendgrid = new SendGrid( $sendgridAPIKey );
75        $response = $this->sendEmail( $to, $from, $subject, $body, $sendgrid );
76
77        if ( $response !== null && $response->isOK() ) {
78            // The email was successfully sent. Return
79            // `false` to skip calling `mail()` which
80            // is the regular way that core sends mails.
81            return false;
82        }
83
84        if ( $response === null || !$response->isOK() ) {
85            // Inform the user why the email was not sent.
86            $error = FormatJson::decode( $response->getErrors()[0]['message'] );
87            throw new MWException(
88                $error->errors[0]->message ?? '$wgPasswordSender does not match Sender Identity on SendGrid'
89            );
90        }
91    }
92
93    /**
94     * Send Email via the API
95     *
96     * @param array $to
97     * @param MailAddress $from
98     * @param string $subject
99     * @param string $body
100     * @param SendGrid|null $sendgrid
101     *
102     * @return Status|null
103     * @throws MWException|TypeException
104     */
105    public function sendEmail(
106        array $to,
107        MailAddress $from,
108        $subject,
109        $body,
110        ?SendGrid $sendgrid = null
111    ): ?Status {
112        if ( $sendgrid === null ) {
113            return null;
114        }
115
116        // Get $to and $from email addresses from the
117        // `array` and `MailAddress` object respectively
118        $email = new Mail();
119        $email->addTo( $to[0]->address );
120
121        if ( filter_var( $from->address, FILTER_VALIDATE_EMAIL ) ) {
122            try {
123                $email->setFrom( $from->address );
124            } catch ( TypeException $e ) {
125                return Status::newGood( $e->getMessage() );
126            }
127        } else {
128            throw new MWException(
129                'Invalid "from" email, check the $wgPasswordSender configs'
130            );
131        }
132
133        $email->setSubject( $subject );
134        $email->addContent( 'text/plain', $body );
135
136        try {
137            $response = $sendgrid->send( $email );
138            if ( $response->statusCode() === self::RESPONSE_CODE_OK ) {
139                return Status::newGood();
140            }
141
142            return Status::newFatal( 'sendgrid-email-not-sent' );
143        } catch ( Exception $e ) {
144            return Status::newGood( $e->getMessage() );
145        }
146    }
147
148}