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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2006 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Mail;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Log\Log;
use Joomla\CMS\Mail\Exception\MailDisabledException;
use PHPMailer\PHPMailer\Exception as phpmailerException;
use PHPMailer\PHPMailer\PHPMailer;

/**
 * Email Class.  Provides a common interface to send email from the Joomla! Platform
 *
 * @since  1.7.0
 */
class Mail extends PHPMailer
{
	/**
	 * Mail instances container.
	 *
	 * @var    Mail[]
	 * @since  1.7.3
	 */
	protected static $instances = array();

/**
	 * Charset of the message.
	 *
	 * @var    string
	 * @since  1.7.0
	 */
	public $CharSet = 'utf-8';

/**
	 * Constructor
	 *
	 * @param   boolean  $exceptions  Flag if Exceptions should be thrown
	 *
	 * @since   1.7.0
	 */
	public function __construct($exceptions = true)
	{
		parent::__construct($exceptions);

// PHPMailer has an issue using the relative path for its language files
		$this->setLanguage('en_gb', __DIR__ . '/language/');

// Configure a callback function to handle errors when $this->debug() is called
		$this->Debugoutput = function ($message, $level)
		{
			Log::add(sprintf('Error in Mail API: %s', $message), Log::ERROR, 'mail');
		};

// If debug mode is enabled then set SMTPDebug to the maximum level
		if (\defined('JDEBUG') && JDEBUG)
		{
			$this->SMTPDebug = 4;
		}

// Don't disclose the PHPMailer version
		$this->XMailer = ' ';

/**
		 * Which validator to use by default when validating email addresses.
		 * Validation patterns supported:
		 * `auto` Pick best pattern automatically;
		 * `pcre8` Use the squiloople.com pattern, requires PCRE > 8.0;
		 * `pcre` Use old PCRE implementation;
		 * `php` Use PHP built-in FILTER_VALIDATE_EMAIL;
		 * `html5` Use the pattern given by the HTML5 spec for 'email' type form input elements.
		 * `noregex` Don't use a regex: super fast, really dumb.
		 *
		 * The default used by phpmailer is `php` but this does not support dotless domains so instead we use `html5`
		 *
		 * @see PHPMailer::validateAddress()
		 *
		 * @var string|callable
		 */
		PHPMailer::$validator = 'html5';
	}

/**
	 * Returns the global email object, only creating it if it doesn't already exist.
	 *
	 * NOTE: If you need an instance to use that does not have the global configuration
	 * values, use an id string that is not 'Joomla'.
	 *
	 * @param   string   $id          The id string for the Mail instance [optional]
	 * @param   boolean  $exceptions  Flag if Exceptions should be thrown [optional]
	 *
	 * @return  Mail  The global Mail object
	 *
	 * @since   1.7.0
	 */
	public static function getInstance($id = 'Joomla', $exceptions = true)
	{
		if (empty(static::$instances[$id]))
		{
			static::$instances[$id] = new static($exceptions);
		}

return static::$instances[$id];
	}

/**
	 * Send the mail
	 *
	 * @return  boolean  Boolean true if successful, false if exception throwing is disabled.
	 *
	 * @since   1.7.0
	 *
	 * @throws  MailDisabledException  if the mail function is disabled
	 * @throws  phpmailerException     if sending failed
	 */
	public function Send()
	{
		if (!Factory::getApplication()->get('mailonline', 1))
		{
			throw new MailDisabledException(
				MailDisabledException::REASON_USER_DISABLED,
				Text::_('JLIB_MAIL_FUNCTION_OFFLINE'),
				500
			);
		}

if ($this->Mailer === 'mail' && !\function_exists('mail'))
		{
			throw new MailDisabledException(
				MailDisabledException::REASON_MAIL_FUNCTION_NOT_AVAILABLE,
				Text::_('JLIB_MAIL_FUNCTION_DISABLED'),
				500
			);
		}

try
		{
			$result = parent::send();
		}
		catch (phpmailerException $e)
		{
			// If auto TLS is disabled just let this bubble up
			if (!$this->SMTPAutoTLS)
			{
				throw $e;
			}

$result = false;
		}

/*
		 * If sending failed and auto TLS is enabled, retry sending with the feature disabled
		 *
		 * See https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting#opportunistic-tls for more info
		 */
		if (!$result && $this->SMTPAutoTLS)
		{
			$this->SMTPAutoTLS = false;

try
			{
				$result = parent::send();
			}
			finally
			{
				// Reset the value for any future emails
				$this->SMTPAutoTLS = true;
			}
		}

return $result;
	}

/**
	 * Set the email sender
	 *
	 * @param   mixed  $from  email address and Name of sender
	 *                        <code>array([0] => email Address, [1] => Name)</code>
	 *                        or as a string
	 *
	 * @return  Mail|boolean  Returns this object for chaining on success or boolean false on failure.
	 *
	 * @since   1.7.0
	 *
	 * @throws  \UnexpectedValueException  if the sender is not a valid address
	 * @throws  phpmailerException 			if setting the sender failed and exception throwing is enabled
	 */
	public function setSender($from)
	{
		if (\is_array($from))
		{
			// If $from is an array we assume it has an address and a name
			if (isset($from[2]))
			{
				// If it is an array with entries, use them
				$result = $this->setFrom(MailHelper::cleanLine($from[0]), MailHelper::cleanLine($from[1]), (bool) $from[2]);
			}
			else
			{
				$result = $this->setFrom(MailHelper::cleanLine($from[0]), MailHelper::cleanLine($from[1]));
			}
		}
		elseif (\is_string($from))
		{
			// If it is a string we assume it is just the address
			$result = $this->setFrom(MailHelper::cleanLine($from));
		}
		else
		{
			// If it is neither, we log a message and throw an exception
			Log::add(Text::sprintf('JLIB_MAIL_INVALID_EMAIL_SENDER', $from), Log::WARNING, 'jerror');

throw new \UnexpectedValueException(sprintf('Invalid email sender: %s', $from));
		}

if ($result === false)
		{
			return false;
		}

return $this;
	}

/**
	 * Set the email subject
	 *
	 * @param   string  $subject  Subject of the email
	 *
	 * @return  Mail  Returns this object for chaining.
	 *
	 * @since   1.7.0
	 */
	public function setSubject($subject)
	{
		$this->Subject = MailHelper::cleanLine($subject);

return $this;
	}

/**
	 * Set the email body
	 *
	 * @param   string  $content  Body of the email
	 *
	 * @return  Mail  Returns this object for chaining.
	 *
	 * @since   1.7.0
	 */
	public function setBody($content)
	{
		/*
		 * Filter the Body
		 * TODO: Check for XSS
		 */
		$this->Body = MailHelper::cleanText($content);

return $this;
	}

/**
	 * Add recipients to the email.
	 *
	 * @param   mixed   $recipient  Either a string or array of strings [email address(es)]
	 * @param   mixed   $name       Either a string or array of strings [name(s)]
	 * @param   string  $method     The parent method's name.
	 *
	 * @return  Mail|boolean  Returns this object for chaining on success or boolean false on failure.
	 *
	 * @since   1.7.0
	 *
	 * @throws  \InvalidArgumentException if the argument array counts do not match
	 * @throws  phpmailerException  if setting the address failed and exception throwing is enabled
	 */
	protected function add($recipient, $name = '', $method = 'addAddress')
	{
		$method = lcfirst($method);

// If the recipient is an array, add each recipient... otherwise just add the one
		if (\is_array($recipient))
		{
			if (\is_array($name))
			{
				$combined = array_combine($recipient, $name);

if ($combined === false)
				{
					throw new \InvalidArgumentException("The number of elements for each array isn't equal.");
				}

foreach ($combined as $recipientEmail => $recipientName)
				{
					$recipientEmail = MailHelper::cleanLine($recipientEmail);
					$recipientName = MailHelper::cleanLine($recipientName);

// Check for boolean false return if exception handling is disabled
					if (\call_user_func('parent::' . $method, $recipientEmail, $recipientName) === false)
					{
						return false;
					}
				}
			}
			else
			{
				$name = MailHelper::cleanLine($name);

foreach ($recipient as $to)
				{
					$to = MailHelper::cleanLine($to);

// Check for boolean false return if exception handling is disabled
					if (\call_user_func('parent::' . $method, $to, $name) === false)
					{
						return false;
					}
				}
			}
		}
		else
		{
			$recipient = MailHelper::cleanLine($recipient);

// Check for boolean false return if exception handling is disabled
			if (\call_user_func('parent::' . $method, $recipient, $name) === false)
			{
				return false;
			}
		}

return $this;
	}

/**
	 * Add recipients to the email
	 *
	 * @param   mixed  $recipient  Either a string or array of strings [email address(es)]
	 * @param   mixed  $name       Either a string or array of strings [name(s)]
	 *
	 * @return  Mail|boolean  Returns this object for chaining on success or false on failure when exception throwing is disabled.
	 *
	 * @since   1.7.0
	 *
	 * @throws  phpmailerException  if exception throwing is enabled
	 */
	public function addRecipient($recipient, $name = '')
	{
		return $this->add($recipient, $name, 'addAddress');
	}

/**
	 * Add carbon copy recipients to the email
	 *
	 * @param   mixed  $cc    Either a string or array of strings [email address(es)]
	 * @param   mixed  $name  Either a string or array of strings [name(s)]
	 *
	 * @return  Mail|boolean  Returns this object for chaining on success or boolean false on failure when exception throwing is enabled.
	 *
	 * @since   1.7.0
	 *
	 * @throws  phpmailerException  if exception throwing is enabled
	 */
	public function addCc($cc, $name = '')
	{
		// If the carbon copy recipient is an array, add each recipient... otherwise just add the one
		if (isset($cc))
		{
			return $this->add($cc, $name, 'addCC');
		}

return $this;
	}

/**
	 * Add blind carbon copy recipients to the email
	 *
	 * @param   mixed  $bcc   Either a string or array of strings [email address(es)]
	 * @param   mixed  $name  Either a string or array of strings [name(s)]
	 *
	 * @return  Mail|boolean  Returns this object for chaining on success or boolean false on failure when exception throwing is disabled.
	 *
	 * @since   1.7.0
	 *
	 * @throws  phpmailerException  if exception throwing is enabled
	 */
	public function addBcc($bcc, $name = '')
	{
		// If the blind carbon copy recipient is an array, add each recipient... otherwise just add the one
		if (isset($bcc))
		{
			return $this->add($bcc, $name, 'addBCC');
		}

return $this;
	}

/**
	 * Add file attachment to the email
	 *
	 * @param   mixed   $path         Either a string or array of strings [filenames]
	 * @param   mixed   $name         Either a string or array of strings [names]. N.B. if this is an array it must contain the same
	 *                                number of elements as the array of paths supplied.
	 * @param   mixed   $encoding     The encoding of the attachment
	 * @param   mixed   $type         The mime type
	 * @param   string  $disposition  The disposition of the attachment
	 *
	 * @return  Mail|boolean  Returns this object for chaining on success or boolean false on failure when exception throwing is disabled.
	 *
	 * @since   3.0.1
	 * @throws  \InvalidArgumentException  if the argument array counts do not match
	 * @throws  phpmailerException 			if setting the attachment failed and exception throwing is enabled
	 */
	public function addAttachment($path, $name = '', $encoding = 'base64', $type = 'application/octet-stream', $disposition = 'attachment')
	{
		// If the file attachments is an array, add each file... otherwise just add the one
		if (isset($path))
		{
			$result = true;

if (\is_array($path))
			{
				if (!empty($name) && \count($path) != \count($name))
				{
					throw new \InvalidArgumentException('The number of attachments must be equal with the number of name');
				}

foreach ($path as $key => $file)
				{
					if (!empty($name))
					{
						$result = parent::addAttachment($file, $name[$key], $encoding, $type);
					}
					else
					{
						if (!empty($name))
						{
							$result = parent::addAttachment($file, $name[$key], $encoding, $type, $disposition);
						}
						else
						{
							$result = parent::addAttachment($file, $name, $encoding, $type, $disposition);
						}
					}
				}

// Check for boolean false return if exception handling is disabled
				if ($result === false)
				{
					return false;
				}
			}
			else
			{
				$result = parent::addAttachment($path, $name, $encoding, $type);
			}

// Check for boolean false return if exception handling is disabled
			if ($result === false)
			{
				return false;
			}
		}

return $this;
	}

/**
	 * Unset all file attachments from the email
	 *
	 * @return  Mail  Returns this object for chaining.
	 *
	 * @since   3.0.1
	 */
	public function clearAttachments()
	{
		parent::clearAttachments();

return $this;
	}

/**
	 * Unset file attachments specified by array index.
	 *
	 * @param   integer  $index  The numerical index of the attachment to remove
	 *
	 * @return  Mail  Returns this object for chaining.
	 *
	 * @since   3.0.1
	 */
	public function removeAttachment($index = 0)
	{
		if (isset($this->attachment[$index]))
		{
			unset($this->attachment[$index]);
		}

return $this;
	}

/**
	 * Add Reply to email address(es) to the email
	 *
	 * @param   mixed  $replyto  Either a string or array of strings [email address(es)]
	 * @param   mixed  $name     Either a string or array of strings [name(s)]
	 *
	 * @return  Mail|boolean  Returns this object for chaining on success or boolean false on failure when exception throwing is disabled.
	 *
	 * @since   1.7.0
	 *
	 * @throws  phpmailerException  if exception throwing is enabled
	 */
	public function addReplyTo($replyto, $name = '')
	{
		return $this->add($replyto, $name, 'addReplyTo');
	}

/**
	 * Sets message type to HTML
	 *
	 * @param   boolean  $ishtml  Boolean true or false.
	 *
	 * @return  Mail  Returns this object for chaining.
	 *
	 * @since   3.1.4
	 */
	public function isHtml($ishtml = true)
	{
		parent::isHTML($ishtml);

return $this;
	}

/**
	 * Send messages using $Sendmail.
	 *
	 * This overrides the parent class to remove the restriction on the executable's name containing the word "sendmail"
	 *
	 * @return  void
	 *
	 * @since   1.7.0
	 */
	public function isSendmail()
	{
		// Prefer the Joomla configured sendmail path and default to the configured PHP path otherwise
		$sendmail = Factory::getApplication()->get('sendmail', ini_get('sendmail_path'));

// And if we still don't have a path, then use the system default for Linux
		if (empty($sendmail))
		{
			$sendmail = '/usr/sbin/sendmail';
		}

$this->Sendmail = $sendmail;
		$this->Mailer   = 'sendmail';
	}

/**
	 * Use sendmail for sending the email
	 *
	 * @param   string  $sendmail  Path to sendmail [optional]
	 *
	 * @return  boolean  True on success
	 *
	 * @since   1.7.0
	 */
	public function useSendmail($sendmail = null)
	{
		$this->Sendmail = $sendmail;

if (!empty($this->Sendmail))
		{
			$this->isSendmail();

return true;
		}
		else
		{
			$this->isMail();

return false;
		}
	}

/**
	 * Use SMTP for sending the email
	 *
	 * @param   string   $auth    SMTP Authentication [optional]
	 * @param   string   $host    SMTP Host [optional]
	 * @param   string   $user    SMTP Username [optional]
	 * @param   string   $pass    SMTP Password [optional]
	 * @param   string   $secure  Use secure methods
	 * @param   integer  $port    The SMTP port
	 *
	 * @return  boolean  True on success
	 *
	 * @since   1.7.0
	 */
	public function useSmtp($auth = null, $host = null, $user = null, $pass = null, $secure = null, $port = 25)
	{
		$this->SMTPAuth = $auth;
		$this->Host = $host;
		$this->Username = $user;
		$this->Password = $pass;
		$this->Port = $port;

if ($secure === 'ssl' || $secure === 'tls')
		{
			$this->SMTPSecure = $secure;
		}

if (($this->SMTPAuth !== null && $this->Host !== null && $this->Username !== null && $this->Password !== null)
			|| ($this->SMTPAuth === null && $this->Host !== null))
		{
			$this->isSMTP();

return true;
		}
		else
		{
			$this->isMail();

return false;
		}
	}

/**
	 * Function to send an email
	 *
	 * @param   string   $from         From email address
	 * @param   string   $fromName     From name
	 * @param   mixed    $recipient    Recipient email address(es)
	 * @param   string   $subject      email subject
	 * @param   string   $body         Message body
	 * @param   boolean  $mode         false = plain text, true = HTML
	 * @param   mixed    $cc           CC email address(es)
	 * @param   mixed    $bcc          BCC email address(es)
	 * @param   mixed    $attachment   Attachment file name(s)
	 * @param   mixed    $replyTo      Reply to email address(es)
	 * @param   mixed    $replyToName  Reply to name(s)
	 *
	 * @return  boolean  True on success, false on failure when exception throwing is disabled.
	 *
	 * @since   1.7.0
	 *
	 * @throws  MailDisabledException  if the mail function is disabled
	 * @throws  phpmailerException     if exception throwing is enabled
	 */
	public function sendMail($from, $fromName, $recipient, $subject, $body, $mode = false, $cc = null, $bcc = null, $attachment = null,
		$replyTo = null, $replyToName = null
	)
	{
		// Create config object
		$app = Factory::getApplication();

$this->setSubject($subject);
		$this->setBody($body);

// Are we sending the email as HTML?
		$this->isHtml($mode);

/*
		 * Do not send the message if adding any of the below items fails
		 */

if ($this->addRecipient($recipient) === false)
		{
			return false;
		}

if ($this->addCc($cc) === false)
		{
			return false;
		}

if ($this->addBcc($bcc) === false)
		{
			return false;
		}

if ($this->addAttachment($attachment) === false)
		{
			return false;
		}

// Take care of reply email addresses
		if (\is_array($replyTo))
		{
			$numReplyTo = \count($replyTo);

for ($i = 0; $i < $numReplyTo; $i++)
			{
				if ($this->addReplyTo($replyTo[$i], $replyToName[$i]) === false)
				{
					return false;
				}
			}
		}
		elseif (isset($replyTo))
		{
			if ($this->addReplyTo($replyTo, $replyToName) === false)
			{
				return false;
			}
		}
		elseif ($app->get('replyto'))
		{
			$this->addReplyTo($app->get('replyto'), $app->get('replytoname'));
		}

// Add sender to replyTo only if no replyTo received
		$autoReplyTo = empty($this->ReplyTo);

if ($this->setSender(array($from, $fromName, $autoReplyTo)) === false)
		{
			return false;
		}

return $this->Send();
	}
}