Magento 2 add attachment to attach files to the contact us form

Tuesday, January 26, 2021

In this tutorial, we will learn about how to add attachment (browse) button in Magento2 contact us form.

We will first override default contact us form with our module's phtml file. Add file upload buton in phtml file. And then override contact us post controller to make it work as per our custom logic.

Let's start it by creating custom module.

Find complete module on Github.

Create folder in app/code/Magelearn/ContactAttachment

Step 1: Create module registration file

Add registration.php file in it:

<?php
/**
 * Copyright ©  All rights reserved.
 * See COPYING.txt for license details.
 */
use Magento\Framework\Component\ComponentRegistrar;
 
ComponentRegistrar::register(ComponentRegistrar::MODULE, 'Magelearn_ContactAttachment', __DIR__);

Add composer.json file in it:

{
    "name": "magelearn/contactattachment",
    "description": "Magento 2 add attachment to attach files to the contact us form",
    "type": "magento2-module",
    "license": "OSL-3.0",
    "authors": [
        {
            "email": "info@mage2gen.com",
            "name": "Mage2Gen"
        },
        {
            "email": "vijaymrami@gmail.com",
            "name": "vijay rami"
        }
    ],
    "minimum-stability": "dev",
    "require": {},
    "autoload": {
        "files": [
            "registration.php"
        ],
        "psr-4": {
            "Magelearn\\ContactAttachment\\": ""
        }
    }
}

Add etc/module.xml file in it:

<?xml version="1.0" ?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="Magelearn_ContactAttachment" setup_version="1.0.0">
    	<sequence>
            <module name="Magento_Contact"/>
            <module name="Magento_Framework"/>
        </sequence>
    </module>
</config>

Now first let's modify default Magento2 Contact us form HTML with layout xml file.

Add contact_index_index.xml file in view/frontend/layout

<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="1column" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceBlock name="contactForm" remove="true"/>
        <referenceContainer name="content">
            <block class="Magento\Contact\Block\ContactForm" name="magelearn.contact.attachment" template="Magelearn_ContactAttachment::form.phtml">
            	<container name="form.additional.info" label="Form Additional Info"/>
                <arguments>
                    <argument name="view_model" xsi:type="object">Magento\Contact\ViewModel\UserDataProvider</argument>
                </arguments>
            </block>
        </referenceContainer>
    </body>
</page>
Now add our custom phtml file.
Add form.phtml file in view/frontend/templates

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

// @codingStandardsIgnoreFile
/** @var \Magento\Contact\Block\ContactForm $block */
/** @var \Magento\Contact\ViewModel\UserDataProvider $viewModel */

$viewModel = $block->getViewModel();
?>
<form class="form contact"
        action="<?= $block->escapeUrl($block->getFormAction()) ?>"
        id="contact-form"
        method="post"
        data-hasrequired="<?= $block->escapeHtmlAttr(__('* Required Fields')) ?>"
        data-mage-init='{"validation":{}}'
        enctype="multipart/form-data">
    <fieldset class="fieldset">
        <legend class="legend"><span><?= $block->escapeHtml(__('Write Us')) ?></span></legend>
        <br/>
        <div class="field note no-label"><?= $block->escapeHtml(__('Jot us a note and we’ll get back to you as quickly as possible.')) ?></div>
        <div class="field name required">
            <label class="label" for="name"><span><?= $block->escapeHtml(__('Name')) ?></span></label>
            <div class="control">
                <input name="name" 
                       id="name" 
                       title="<?= $block->escapeHtmlAttr(__('Name')) ?>" 
                       value="<?= $block->escapeHtmlAttr($viewModel->getUserName()) ?>" 
                       class="input-text" 
                       type="text" 
                       data-validate="{required:true}"/>
            </div>
        </div>
        <div class="field email required">
            <label class="label" for="email"><span><?= $block->escapeHtml(__('Email')) ?></span></label>
            <div class="control">
                <input name="email" 
                       id="email" 
                       title="<?= $block->escapeHtmlAttr(__('Email')) ?>" 
                       value="<?= $block->escapeHtmlAttr($viewModel->getUserEmail()) ?>" 
                       class="input-text" 
                       type="email" 
                       data-validate="{required:true, 'validate-email':true}"/>
            </div>
        </div>
        <div class="field telephone">
            <label class="label" for="telephone"><span><?= $block->escapeHtml(__('Phone Number')) ?></span></label>
            <div class="control">
                <input name="telephone" 
                       id="telephone" 
                       title="<?= $block->escapeHtmlAttr(__('Phone Number')) ?>" 
                       value="<?= $block->escapeHtmlAttr($viewModel->getUserTelephone()) ?>" 
                       class="input-text" 
                       type="tel" />
            </div>
        </div>
        <div class="field comment required">
            <label class="label" for="comment"><span><?= $block->escapeHtml(__('What’s on your mind?')) ?></span></label>
            <div class="control">
                <textarea name="comment" 
                     id="comment"
                     title="<?= $block->escapeHtmlAttr(__('What’s on your mind?')) ?>"
                     class="input-text"
                     cols="5"
                     rows="3"
                     data-validate="{required:true}"><?= $block->escapeHtml($viewModel->getUserComment()) ?></textarea>
            </div>
        </div>
        <div class="field attachment">
            <label class="label" for="attachment"><span><?= $block->escapeHtml(__('Attachment')) ?></span></label>
            <div class="control">
                <input name="attachment" id="attachment" title="<?= $block->escapeHtmlAttr(__('Attachment')) ?>" value="<?= $block->escapeHtmlAttr($this->helper('Magento\Contact\Helper\Data')->getPostValue('attachment')) ?>" class="input-text" type="file"/>
            </div>
        </div>
        <?= $block->getChildHtml('form.additional.info') ?>
    </fieldset>
    <div class="actions-toolbar">
        <div class="primary">
            <input type="hidden" name="hideit" id="hideit" value=""/>
            <button type="submit" title="<?= $block->escapeHtmlAttr(__('Submit')) ?>" class="action submit primary">
                <span><?= $block->escapeHtml(__('Submit')) ?></span>
            </button>
        </div>
    </div>
</form>
Add Data.php file in Helper

<?php

namespace Magelearn\ContactAttachment\Helper;

use Magento\Framework\App\Helper\AbstractHelper;
use Magento\Framework\App\ProductMetadataInterface;
use Magento\Framework\ObjectManagerInterface;

/**
 * Class Data
 * @package Magelearn\ContactAttachment\Helper
 */
class Data extends AbstractHelper
{
    /**
     * @type ObjectManagerInterface
     */
    protected $objectManager;

    /**
     * @param \Magento\Framework\App\Helper\Context $context
     */
    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        ObjectManagerInterface $objectManager
    ) {
        $this->objectManager = $objectManager;
        parent::__construct($context);
    }

    /**
     * @param $ver
     * @param string $operator
     * @return mixed
     */
    public function versionCompare($ver, $operator = '>=')
    {
        $productMetadata = $this->objectManager->get(ProductMetadataInterface::class);
        $version = $productMetadata->getVersion();
        return version_compare($version, $ver, $operator);
    }
}

Now, we will override default post action of Magento and override with our code by adding file upload functionality. But now magento new version use ZendFramework2 some of old functions  like createAttachment() and addAttachment() are not available anymore.

So we also have to override Magento\Framework\Mail\Template\TransportBuilder and Magento\Framework\Mail\Message.
Ref. https://magento.stackexchange.com/questions/252506/magento-2-3-custom-email-attachment-not-working

Now, Considering all above point Add etc/di.xml file:
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\Framework\Mail\Template\TransportBuilder" type="Magelearn\ContactAttachment\Rewrite\Magento\Framework\Mail\Template\TransportBuilder"/>
    <preference for="Magento\Framework\Mail\Message" type="Magelearn\ContactAttachment\Mail\Message"/>
    <preference for="Magento\Contact\Controller\Index\Post" type="Magelearn\ContactAttachment\Rewrite\Magento\Contact\Controller\Index\Post"/>
</config>
As createAttachment() method is no more available, we will override Magento\Framework\Mail\Message and create a class which will implement Magento\Framework\Mail\MailMessageInterface.

Add Mail/Message.php file
<?php
/**
 * NOTICE OF LICENSE
 *
 * This source file is subject to the commercial license
 * that is bundled with this package in the file LICENSE.txt.
 *
 * @category Magelearn
 * @package Magelearn_ContactAttachment
 * @copyright Copyright (c) 2016-2018 Extait, Inc. (http://www.extait.com)
 */

namespace Magelearn\ContactAttachment\Mail;

use Magento\Framework\Mail\MailMessageInterface;
use Zend\Mime\Mime;
use Zend\Mime\Part;
use Zend\Mime\PartFactory;
use Zend\Mail\MessageFactory as MailMessageFactory;
use Zend\Mime\MessageFactory as MimeMessageFactory;

class Message implements MailMessageInterface
{
    /**
     * @var \Zend\Mime\PartFactory
     */
    protected $partFactory;

    /**
     * @var \Zend\Mime\MessageFactory
     */
    protected $mimeMessageFactory;

    /**
     * @var \Zend\Mail\Message
     */
    private $zendMessage;
	
	private $messageType = self::TYPE_TEXT;
	
    /**
     * @var \Zend\Mime\Part[]
     */
    protected $parts = [];

    /**
     * Message constructor.
     *
     * @param \Zend\Mime\PartFactory $partFactory
     * @param \Zend\Mime\MessageFactory $mimeMessageFactory
     * @param string $charset
     */
    public function __construct(PartFactory $partFactory, MimeMessageFactory $mimeMessageFactory, $charset = 'utf-8')
    {
        $this->partFactory = $partFactory;
        $this->mimeMessageFactory = $mimeMessageFactory;
        $this->zendMessage = MailMessageFactory::getInstance();
        $this->zendMessage->setEncoding($charset);
    }

    /**
     * Add the HTML mime part to the message.
     *
     * @param string $content
     * @return $this
     */
    public function setBodyText($content)
    {
    	$this->setMessageType(self::TYPE_TEXT);
        $textPart = $this->partFactory->create();

        $textPart->setContent($content)
            ->setType(Mime::TYPE_TEXT)
            ->setCharset($this->zendMessage->getEncoding());

        $this->parts[] = $textPart;

        return $this;
    }

    /**
     * Add the text mime part to the message.
     *
     * @param string $content
     * @return $this
     */
    public function setBodyHtml($content)
    {
    	$this->setMessageType(self::TYPE_HTML);
        $htmlPart = $this->partFactory->create();

        $htmlPart->setContent($content)
            ->setType(Mime::TYPE_HTML)
            ->setCharset($this->zendMessage->getEncoding());

        $this->parts[] = $htmlPart;
		
		$mimeMessage = new \Zend\Mime\Message();
        $mimeMessage->addPart($htmlPart);
        $this->zendMessage->setBody($mimeMessage);
		
        return $this;
    }

    /**
     * Add the attachment mime part to the message.
     *
     * @param string $content
     * @param string $fileName
     * @param string $fileType
     * @return $this
     */
    public function setBodyAttachment($content, $fileName, $fileType)
    {
        $attachmentPart = $this->partFactory->create();

        $attachmentPart->setContent($content)
            ->setType($fileType)
            ->setFileName($fileName)
            ->setDisposition(Mime::DISPOSITION_ATTACHMENT)
            ->setEncoding(Mime::ENCODING_BASE64);

        $this->parts[] = $attachmentPart;

        return $this;
    }

    /**
     * Set parts to Zend message body.
     *
     * @return $this
     */
    public function setPartsToBody()
    {
        $mimeMessage = $this->mimeMessageFactory->create();
        $mimeMessage->setParts($this->parts);
        $this->zendMessage->setBody($mimeMessage);

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function setBody($body)
    {
    	if (is_string($body) && $this->messageType === self::TYPE_HTML) {
            $body = self::createHtmlMimeFromString($body);
        }
        $this->zendMessage->setBody($body);
        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function setSubject($subject)
    {
        $this->zendMessage->setSubject($subject);

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function getSubject()
    {
        return $this->zendMessage->getSubject();
    }

    /**
     * {@inheritdoc}
     */
    public function getBody()
    {
        return $this->zendMessage->getBody();
    }

    /**
     * {@inheritdoc}
     */
    public function setFrom($fromAddress)
    {
        $this->zendMessage->setFrom($fromAddress);

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function addTo($toAddress)
    {
        $this->zendMessage->addTo($toAddress);

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function addCc($ccAddress)
    {
        $this->zendMessage->addCc($ccAddress);

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function addBcc($bccAddress)
    {
        $this->zendMessage->addBcc($bccAddress);

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function setReplyTo($replyToAddress)
    {
        $this->zendMessage->setReplyTo($replyToAddress);

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function getRawMessage()
    {
        return $this->zendMessage->toString();
    }
    
    private function createHtmlMimeFromString($htmlBody)
    {
        $htmlPart = new Part($htmlBody);
        $htmlPart->setCharset($this->zendMessage->getEncoding());
        $htmlPart->setType(Mime::TYPE_HTML);
        $mimeMessage = new \Zend\Mime\Message();
        $mimeMessage->addPart($htmlPart);

        return $mimeMessage;
    }
    /**
     * @inheritDoc
     */
    public function setMessageType($type)
    {
    	$this->messageType = $type;
        return $this;
    }
}
After implementation of the Mail\Message class we need to extend the \Magento\Framework\Mail\Template\TransportBuilder class.

This class is used for building the \Magento\Framework\Mail\Transport class which is in turn used for email sending.Here, we will define our addAttachment() function.

Add TransportBuilder.php at Rewrite/Magento/Framework/Mail/Template/<?php
 
namespace Magelearn\ContactAttachment\Rewrite\Magento\Framework\Mail\Template;
 
use Magento\Framework\App\TemplateTypesInterface;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Exception\MailException;
use Magento\Framework\Mail\EmailMessageInterface;
use Magento\Framework\Mail\EmailMessageInterfaceFactory;
use Magento\Framework\Mail\AddressConverter;
use Magento\Framework\Mail\Exception\InvalidArgumentException;
use Magento\Framework\Mail\MessageInterface;
use Magento\Framework\Mail\MessageInterfaceFactory;
use Magento\Framework\Mail\MimeInterface;
use Magento\Framework\Mail\MimeMessageInterfaceFactory;
use Magento\Framework\Mail\MimePartInterfaceFactory;
use Magento\Framework\Mail\Template\FactoryInterface;
use Magento\Framework\Mail\Template\SenderResolverInterface;
use Magento\Framework\Mail\TemplateInterface;
use Magento\Framework\Mail\TransportInterface;
use Magento\Framework\Mail\TransportInterfaceFactory;
use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\Phrase;
use Zend\Mime\Mime;
use Zend\Mime\PartFactory;
/**
 * TransportBuilder
 *
 * @api
 * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
 * @since 100.0.2
 */
class TransportBuilder extends \Magento\Framework\Mail\Template\TransportBuilder
{
    /**
     * Template Identifier
     *
     * @var string
     */
    protected $templateIdentifier;
 
    /**
     * Template Model
     *
     * @var string
     */
    protected $templateModel;
 
    /**
     * Template Variables
     *
     * @var array
     */
    protected $templateVars;
 
    /**
     * Template Options
     *
     * @var array
     */
    protected $templateOptions;
 
    /**
     * Mail Transport
     *
     * @var TransportInterface
     */
    protected $transport;
 
    /**
     * Template Factory
     *
     * @var FactoryInterface
     */
    protected $templateFactory;
 
    /**
     * Object Manager
     *
     * @var ObjectManagerInterface
     */
    protected $objectManager;
 
    /**
     * Message
     *
     * @var EmailMessageInterface
     */
    protected $message;
 
    /**
     * Sender resolver
     *
     * @var SenderResolverInterface
     */
    protected $_senderResolver;
 
    /**
     * @var TransportInterfaceFactory
     */
    protected $mailTransportFactory;
 
    /**
     * Param that used for storing all message data until it will be used
     *
     * @var array
     */
    private $messageData = [];
 
    /**
     * @var EmailMessageInterfaceFactory
     */
    private $emailMessageInterfaceFactory;
 
    /**
     * @var MimeMessageInterfaceFactory
     */
    private $mimeMessageInterfaceFactory;
 
    /**
     * @var MimePartInterfaceFactory
     */
    private $mimePartInterfaceFactory;
 
    /**
     * @var AddressConverter|null
     */
    private $addressConverter;
 
    protected $attachments = [];
 
    protected $partFactory;
 
    /**
     * TransportBuilder constructor
     *
     * @param FactoryInterface $templateFactory
     * @param MessageInterface $message
     * @param SenderResolverInterface $senderResolver
     * @param ObjectManagerInterface $objectManager
     * @param TransportInterfaceFactory $mailTransportFactory
     * @param MessageInterfaceFactory|null $messageFactory
     * @param EmailMessageInterfaceFactory|null $emailMessageInterfaceFactory
     * @param MimeMessageInterfaceFactory|null $mimeMessageInterfaceFactory
     * @param MimePartInterfaceFactory|null $mimePartInterfaceFactory
     * @param addressConverter|null $addressConverter
     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
     * @SuppressWarnings(PHPMD.ExcessiveParameterList)
     */
    public function __construct(
        FactoryInterface $templateFactory,
        MessageInterface $message,
        SenderResolverInterface $senderResolver,
        ObjectManagerInterface $objectManager,
        TransportInterfaceFactory $mailTransportFactory,
        MessageInterfaceFactory $messageFactory = null,
        EmailMessageInterfaceFactory $emailMessageInterfaceFactory = null,
        MimeMessageInterfaceFactory $mimeMessageInterfaceFactory = null,
        MimePartInterfaceFactory $mimePartInterfaceFactory = null,
        AddressConverter $addressConverter = null
    ) {
        $this->templateFactory = $templateFactory;
        $this->objectManager = $objectManager;
        $this->_senderResolver = $senderResolver;
        $this->mailTransportFactory = $mailTransportFactory;
        $this->emailMessageInterfaceFactory = $emailMessageInterfaceFactory ?: $this->objectManager
            ->get(EmailMessageInterfaceFactory::class);
        $this->mimeMessageInterfaceFactory = $mimeMessageInterfaceFactory ?: $this->objectManager
            ->get(MimeMessageInterfaceFactory::class);
        $this->mimePartInterfaceFactory = $mimePartInterfaceFactory ?: $this->objectManager
            ->get(MimePartInterfaceFactory::class);
        $this->addressConverter = $addressConverter ?: $this->objectManager
            ->get(AddressConverter::class);
        $this->partFactory = $objectManager->get(PartFactory::class);
        parent::__construct($templateFactory, $message, $senderResolver, $objectManager, $mailTransportFactory, $messageFactory, $emailMessageInterfaceFactory, $mimeMessageInterfaceFactory,
            $mimePartInterfaceFactory, $addressConverter);
    }
 
    /**
     * Add cc address
     *
     * @param array|string $address
     * @param string $name
     *
     * @return $this
     */
    public function addCc($address, $name = '')
    {
        $this->addAddressByType('cc', $address, $name);
 
        return $this;
    }
 
    /**
     * Add to address
     *
     * @param array|string $address
     * @param string $name
     *
     * @return $this
     * @throws InvalidArgumentException
     */
    public function addTo($address, $name = '')
    {
        $this->addAddressByType('to', $address, $name);
 
        return $this;
    }
 
    /**
     * Add bcc address
     *
     * @param array|string $address
     *
     * @return $this
     * @throws InvalidArgumentException
     */
    public function addBcc($address)
    {
        $this->addAddressByType('bcc', $address);
 
        return $this;
    }
 
    /**
     * Set Reply-To Header
     *
     * @param string $email
     * @param string|null $name
     *
     * @return $this
     * @throws InvalidArgumentException
     */
    public function setReplyTo($email, $name = null)
    {
        $this->addAddressByType('replyTo', $email, $name);
 
        return $this;
    }
 
    /**
     * Set mail from address
     *
     * @param string|array $from
     *
     * @return $this
     * @throws InvalidArgumentException
     * @see setFromByScope()
     *
     * @deprecated 102.0.1 This function sets the from address but does not provide
     * a way of setting the correct from addresses based on the scope.
     */
    public function setFrom($from)
    {
        return $this->setFromByScope($from);
    }
 
    /**
     * Set mail from address by scopeId
     *
     * @param string|array $from
     * @param string|int $scopeId
     *
     * @return $this
     * @throws InvalidArgumentException
     * @throws MailException
     * @since 102.0.1
     */
    public function setFromByScope($from, $scopeId = null)
    {
        $result = $this->_senderResolver->resolve($from, $scopeId);
        $this->addAddressByType('from', $result['email'], $result['name']);
 
        return $this;
    }
 
    /**
     * Set template identifier
     *
     * @param string $templateIdentifier
     *
     * @return $this
     */
    public function setTemplateIdentifier($templateIdentifier)
    {
        $this->templateIdentifier = $templateIdentifier;
 
        return $this;
    }
 
    /**
     * Set template model
     *
     * @param string $templateModel
     *
     * @return $this
     */
    public function setTemplateModel($templateModel)
    {
        $this->templateModel = $templateModel;
        return $this;
    }
 
    /**
     * Set template vars
     *
     * @param array $templateVars
     *
     * @return $this
     */
    public function setTemplateVars($templateVars)
    {
        $this->templateVars = $templateVars;
 
        return $this;
    }
 
    /**
     * Set template options
     *
     * @param array $templateOptions
     * @return $this
     */
    public function setTemplateOptions($templateOptions)
    {
        $this->templateOptions = $templateOptions;
 
        return $this;
    }
 
    /**
     * Get mail transport
     *
     * @return TransportInterface
     * @throws LocalizedException
     */
    public function getTransport()
    {
        try {
            $this->prepareMessage();
            $mailTransport = $this->mailTransportFactory->create(['message' => clone $this->message]);
        } finally {
            $this->reset();
        }
 
        return $mailTransport;
    }
 
    /**
     * Reset object state
     *
     * @return $this
     */
    protected function reset()
    {
        $this->messageData = [];
        $this->templateIdentifier = null;
        $this->templateVars = null;
        $this->templateOptions = null;
        return $this;
    }
 
    /**
     * Get template
     *
     * @return TemplateInterface
     */
    protected function getTemplate()
    {
        return $this->templateFactory->get($this->templateIdentifier, $this->templateModel)
            ->setVars($this->templateVars)
            ->setOptions($this->templateOptions);
    }
 
    /**
     * Prepare message.
     *
     * @return $this
     * @throws LocalizedException if template type is unknown
     */
    protected function prepareMessage()
    {
        $template = $this->getTemplate();
        $content = $template->processTemplate();
        switch ($template->getType()) {
            case TemplateTypesInterface::TYPE_TEXT:
                $partType = MimeInterface::TYPE_TEXT;
                break;

            case TemplateTypesInterface::TYPE_HTML:
                $partType = MimeInterface::TYPE_HTML;
                break;

            default:
                throw new LocalizedException(
                    new Phrase('Unknown template type')
                );
        }
        $mimePart = $this->mimePartInterfaceFactory->create(
            [
                'content' => $content,
                'type' => $partType
            ]
        );
        $parts = count($this->attachments) ? array_merge([$mimePart], $this->attachments) : [$mimePart];
        $this->messageData['body'] = $this->mimeMessageInterfaceFactory->create(
            ['parts' => $parts]
        );
 
        $this->messageData['subject'] = html_entity_decode(
            (string)$template->getSubject(),
            ENT_QUOTES
        );
        $this->message = $this->emailMessageInterfaceFactory->create($this->messageData);
 
        return $this;
    }
 
    /**
     * Handles possible incoming types of email (string or array)
     *
     * @param string $addressType
     * @param string|array $email
     * @param string|null $name
     *
     * @return void
     * @throws InvalidArgumentException
     */
    private function addAddressByType(string $addressType, $email, ?string $name = null): void
    {
        if (is_string($email)) {
            $this->messageData[$addressType][] = $this->addressConverter->convert($email, $name);
            return;
        }
        $convertedAddressArray = $this->addressConverter->convertMany($email);
        if (isset($this->messageData[$addressType])) {
            $this->messageData[$addressType] = array_merge(
                $this->messageData[$addressType],
                $convertedAddressArray
            );
        } else {
            $this->messageData[$addressType] = $convertedAddressArray;
        }
    }
 
    /**
     * @param string|null $content
     * @param string|null $fileName
     * @param string|null $fileType
     * @return TransportBuilder
     */
    public function addAttachment(?string $content, ?string $fileName, ?string $fileType)
    {
        $attachmentPart = $this->partFactory->create();
        $attachmentPart->setContent($content)
            ->setType($fileType)
            ->setFileName($fileName)
            ->setDisposition(Mime::DISPOSITION_ATTACHMENT)
            ->setEncoding(Mime::ENCODING_BASE64);
        $this->attachments[] = $attachmentPart;
 
        return $this;
    }
}
Add Post.php file in Rewrite/Magento/Contact/Controller/Index/
<?php

namespace Magelearn\ContactAttachment\Rewrite\Magento\Contact\Controller\Index;

use Magento\Store\Model\StoreManagerInterface;
use Magento\Contact\Model\ConfigInterface;
use Magento\Contact\Model\MailInterface;
use Magento\Framework\App\Action\Context;
use Magento\Framework\App\Area;
use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\App\Request\DataPersistorInterface;
use Magento\Framework\Controller\Result\Redirect;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Filesystem;
use Magento\Framework\Translate\Inline\StateInterface;
use Psr\Log\LoggerInterface;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\DataObject;
use Magento\MediaStorage\Model\File\UploaderFactory;
use Magelearn\ContactAttachment\Rewrite\Magento\Framework\Mail\Template\TransportBuilder;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\Filesystem\Io\File;

/**
 * Post controller class
 */
class Post extends \Magento\Contact\Controller\Index\Post
{
    const FOLDER_LOCATION = 'contactattachment';

    /**
     * @var DataPersistorInterface
     */
    private $dataPersistor;

    /**
     * @var Context
     */
    private $context;

    /**
     * @var MailInterface
     */
    private $mail;

    /**
     * @var LoggerInterface
     */
    private $logger;

    /**
     * @var UploaderFactory
     */
    private $fileUploaderFactory;

    /**
     * @var Filesystem
     */
    private $fileSystem;

    /**
     * @var StateInterface
     */
    private $inlineTranslation;

    /**
     * @var ConfigInterface
     */
    private $contactsConfig;

    /**
     * @var TransportBuilder
     */
    private $transportBuilder;

    /**
     * @var StoreManagerInterface
     */
    private $storeManager;

    /**
     * Post constructor.
     * @param Context $context
     * @param MailInterface $mail
     * @param DataPersistorInterface $dataPersistor
     * @param LoggerInterface|null $logger
     * @param UploaderFactory $fileUploaderFactory
     * @param Filesystem $fileSystem
     * @param StateInterface $inlineTranslation
     * @param ConfigInterface $contactsConfig
     * @param TransportBuilder $transportBuilder
     */
    public function __construct(
        Context $context,
        MailInterface $mail,
        DataPersistorInterface $dataPersistor,
        LoggerInterface $logger = null,
        UploaderFactory $fileUploaderFactory,
        Filesystem $fileSystem,
        StateInterface $inlineTranslation,
        ConfigInterface $contactsConfig,
        TransportBuilder $transportBuilder,
        StoreManagerInterface $storeManager,
        ScopeConfigInterface $scopeConfig,
        File $file
    ) {
        $this->context = $context;
        $this->mail = $mail;
        $this->dataPersistor = $dataPersistor;
        $this->logger = $logger ?: ObjectManager::getInstance()->get(LoggerInterface::class);
        $this->fileUploaderFactory = $fileUploaderFactory;
        $this->fileSystem = $fileSystem;
        $this->inlineTranslation = $inlineTranslation;
        $this->contactsConfig = $contactsConfig;
        $this->transportBuilder = $transportBuilder;
        $this->storeManager = $storeManager;
        $this->scopeConfig = $scopeConfig;
        $this->file = $file;
        parent::__construct($context, $contactsConfig, $mail, $dataPersistor, $logger);
    }

    /**
     * Post user question
     * @return Redirect
     */
    public function execute()
    {
        if (!$this->getRequest()->isPost()) {
            return $this->resultRedirectFactory->create()->setPath('*/*/');
        }
        try {
            $this->sendEmail($this->validatedParams());
            $this->messageManager->addSuccessMessage(
                __('Thanks for contacting us with your comments and questions. We\'ll respond to you very soon.')
            );
            $this->dataPersistor->clear('contact_us');
        } catch (LocalizedException $e) {
            $this->messageManager->addErrorMessage($e->getMessage());
            $this->dataPersistor->set('contact_us', $this->getRequest()->getParams());
        } catch (\Exception $e) {
            $this->logger->critical($e);
            $this->messageManager->addErrorMessage(
                __('An error occurred while processing your form. Please try again later.')
            );
            $this->dataPersistor->set('contact_us', $this->getRequest()->getParams());
        }
        return $this->resultRedirectFactory->create()->setPath('contact/index');
    }

    /**
     * @param array $post Post data from contact form
     * @return void
     */
    private function sendEmail($post)
    {
        $this->send(
            $post['email'],
            ['data' => new DataObject($post)]
        );
    }

    /**
     * Send email from contact form
     * @param string $replyTo
     * @param array $variables
     * @return void
     */
    public function send($replyTo, array $variables)
    {
        $filePath = null;
        $fileName = null;
        $uploaded = false;
                
        try {
            $fileCheck = $this->fileUploaderFactory->create(['fileId' => 'attachment']);
            $file = $fileCheck->validateFile();
            $attachment = $file['name'] ?? null;
        } catch (\Exception $e) {
            $attachment = null;
        }
        
        if ($attachment) {
            $upload = $this->fileUploaderFactory->create(['fileId' => 'attachment']);
            $upload->setAllowRenameFiles(true);
            $upload->setFilesDispersion(true);
            $upload->setAllowCreateFolders(true);
            $upload->setAllowedExtensions(['txt', 'csv', 'jpg', 'jpeg', 'gif', 'png', 'pdf', 'doc', 'docx']);

            $path = $this->fileSystem
                ->getDirectoryRead(DirectoryList::MEDIA)
                ->getAbsolutePath(self::FOLDER_LOCATION);
            $result = $upload->save($path);
            $uploaded = self::FOLDER_LOCATION . $upload->getUploadedFilename();
            $filePath = $result['path'] . $result['file'];
            $fileName = $result['name'];
        }

        /** @see \Magento\Contact\Controller\Index\Post::validatedParams() */
        $replyToName = !empty($variables['data']['name']) ? $variables['data']['name'] : null;

        $this->inlineTranslation->suspend();

        $storeScope = \Magento\Store\Model\ScopeInterface::SCOPE_STORE;
        $transport = $this->transportBuilder
            ->setTemplateIdentifier($this->contactsConfig->emailTemplate())
            ->setTemplateOptions(
                [
                    'area' => Area::AREA_FRONTEND,
                    'store' => $this->storeManager->getStore()->getId(),
                ]
            )
            ->setTemplateVars($variables)
            ->setFrom($this->contactsConfig->emailSender())
            ->addTo($this->contactsConfig->emailRecipient())
            ->setReplyTo($replyTo, $replyToName)
            ->getTransport();

        if ($uploaded && !empty($filePath) && $this->file->fileExists($filePath)) {
            $mimeType = mime_content_type($filePath);

            $transport = $this->transportBuilder
                ->setTemplateIdentifier($this->contactsConfig->emailTemplate())
                ->setTemplateOptions(
                    [
                        'area' => Area::AREA_FRONTEND,
                        'store' => $this->storeManager->getStore()->getId(),
                    ]
                )
                ->addAttachment($this->file->read($filePath), $fileName, $mimeType)
                ->setTemplateVars($variables)
                ->setFrom($this->contactsConfig->emailSender())
                ->addTo($this->contactsConfig->emailRecipient())
                ->setReplyTo($replyTo, $replyToName)
                ->getTransport();
        }

        $transport->sendMessage();
        $this->inlineTranslation->resume();
    }

    /**
     * @return array
     * @throws \Exception
     */
    private function validatedParams()
    {
        $request = $this->getRequest();
        if (trim($request->getParam('name')) === '') {
            throw new LocalizedException(__('Name is missing'));
        }
        if (trim($request->getParam('comment')) === '') {
            throw new LocalizedException(__('Comment is missing'));
        }
        if (false === \strpos($request->getParam('email'), '@')) {
            throw new LocalizedException(__('Invalid email address'));
        }
        if (trim($request->getParam('hideit')) !== '') {
            throw new LocalizedException(__('Error'));
        }

        return $request->getParams();
    }
}
Add email_templates.xml file inside etc/
<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Email:etc/email_templates.xsd">
    <template id="contact_email_attachment_email_template" label="Contact Form with Attachment" file="submitted_form.html" type="html" module="Magelearn_ContactAttachment" area="frontend"/>
</config>
Add submitted_form.html file inside view/frontend/email/
<!--@subject {{trans "Contact Form with Attachment"}} @-->
<!--@vars {
"var data.comment":"Comment",
"var data.email":"Sender Email",
"var data.name":"Sender Name",
"var data.telephone":"Sender Telephone",
"var data.attachment":"Sender Attachment"
} @-->

{{template config_path="design/email/header_template"}}

<table class="message-details">
    <tr>
        <td><strong>{{trans "Name"}}</strong></td>
        <td>{{var data.name}}</td>
    </tr>
    <tr>
        <td><strong>{{trans "Email"}}</strong></td>
        <td>{{var data.email}}</td>
    </tr>
    <tr>
        <td><strong>{{trans "Phone"}}</strong></td>
        <td>{{var data.telephone}}</td>
    </tr>
    <tr>
        <td><strong>{{trans "Attachment"}}</strong></td>
        <td>{{var data.attachment}}</td>
    </tr>
</table>
<p><strong>{{trans "Message"}}</strong></p>
<p>{{var data.comment}}</p>

{{template config_path="design/email/footer_template"}}
After adding above files just run below commands:
php bin/magento set:upg
php bin/magento set:d:c
php bin/magento set:s:d -f en_US
php bin/magento c:c
php bin/magento set:c:f

You will find new browse buton will be added in contactus form and after submitting it admin email receipt will get email notification with attachment in mail.

Tag : Magento2, Magento2 Extensions

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