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Filename : EmailAddress.php
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<?php
/**
 * This helper builds the EmailAddress object for a /mail/send API call
 *
 * PHP Version - 5.6, 7.0, 7.1, 7.2
 *
 * @package   SendGrid\Mail
 * @author    Elmer Thomas <dx@sendgrid.com>
 * @copyright 2018-19 Twilio SendGrid
 * @license   https://opensource.org/licenses/MIT The MIT License
 * @version   GIT: <git_id>
 * @link      http://packagist.org/packages/sendgrid/sendgrid
 */

namespace SendGrid\Mail;

/**
 * This class is used to construct a EmailAddress object for the /mail/send API call
 *
 * @package SendGrid\Mail
 */
class EmailAddress implements \JsonSerializable
{
    /** @var $name string The name of the person associated with the email */
    private $name;
    /** @var $email string The email address */
    private $email;
    /** @var $substitutions Substitution[] An array of key/value substitutions to be be applied to the text and html content of the email body */
    private $substitutions;
    /** @var $subject Subject The personalized subject of the email */
    private $subject;

    /**
     * Optional constructor
     *
     * @param string|null $emailAddress The email address
     * @param string|null $name The name of the person associated with
     *                                   the email
     * @param array|null $substitutions An array of key/value substitutions to
     *                                   be be applied to the text and html content
     *                                   of the email body
     * @param string|null $subject The personalized subject of the email
     */
    public function __construct(
        $emailAddress = null,
        $name = null,
        $substitutions = null,
        $subject = null
    ) {
        if (isset($emailAddress)) {
            $this->setEmailAddress($emailAddress);
        }
        if (isset($name) && $name !== null) {
            $this->setName($name);
        }
        if (isset($substitutions)) {
            $this->setSubstitutions($substitutions);
        }
        if (isset($subject)) {
            $this->setSubject($subject);
        }
    }

    /**
     * Add the email address to a EmailAddress object
     *
     * @param string $emailAddress The email address
     * 
     * @throws TypeException
     */ 
    public function setEmailAddress($emailAddress)
    {
        if (!(is_string($emailAddress) &&
            filter_var($emailAddress, FILTER_VALIDATE_EMAIL))
        ) {
            throw new TypeException(
                '$emailAddress must be valid and of type string.'
            );
        }
        $this->email = $emailAddress;
    }

    /**
     * Retrieve the email address from a EmailAddress object
     *
     * @return string
     */
    public function getEmailAddress()
    {
        return $this->email;
    }

    /**
     * Retrieve the email address from a EmailAddress object
     *
     * @return string
     */
    public function getEmail()
    {
        return $this->getEmailAddress();
    }

    /**
     * Add a name to a EmailAddress object
     *
     * @param string $name The name of the person associated with the email
     * 
     * @throws TypeException
     */ 
    public function setName($name)
    {
        if (!is_string($name)) {
            throw new TypeException('$name must be of type string.');
        }

        /*
            Issue #368
            ==========
            If the name is not wrapped in double quotes and contains a comma or
            semicolon, the API fails to parse it correctly.
            When wrapped in double quotes, commas, semicolons and unescaped single
            quotes are supported.
            Escaped double quotes are supported as well but will appear unescaped in
            the mail (e.g. "O\'Keefe").
            Double quotes will be shown in some email clients, so the name should
            only be wrapped when necessary.
        */
        // Only wrapp in double quote if comma or semicolon are found
        if (false !== strpos($name, ',') || false !== strpos($name, ';')) {
            // Unescape quotes
            $name = stripslashes(html_entity_decode($name, ENT_QUOTES));
            // Escape only double quotes
            $name = str_replace('"', '\\"', $name);
            // Wrapp in double quotes
            $name = '"' . $name . '"';
        }
        $this->name = (!empty($name)) ? $name : null;
    }

    /**
     * Retrieve the name from a EmailAddress object
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Add substitutions to a EmailAddress object
     *
     * @param array $substitutions An array of key/value substitutions to
     *                             be be applied to the text and html content
     *                             of the email body
     * 
     * @throws TypeException
     */ 
    public function setSubstitutions($substitutions)
    {
        if (!is_array($substitutions)) {
            throw new TypeException('$substitutions must be an array.');
        }

        $this->substitutions = $substitutions;
    }

    /**
     * Retrieve substitutions from a EmailAddress object
     */
    public function getSubstitutions()
    {
        return $this->substitutions;
    }

    /**
     * Add a subject to a EmailAddress object
     *
     * @param string $subject The personalized subject of the email
     * 
     * @throws TypeException
     */ 
    public function setSubject($subject)
    {
        if (!is_string($subject)) {
            throw new TypeException('$subject must be of type string.');
        }
        if (!($subject instanceof Subject)) {
            $this->subject = new Subject($subject);
        } else {
            $this->subject = $subject;
        }
    }

    /**
     * Retrieve a subject from a EmailAddress object
     *
     * @return Subject
     */
    public function getSubject()
    {
        return $this->subject;
    }

    /**
     * Return an array representing a EmailAddress object for the Twilio SendGrid API
     *
     * @return null|array
     */
    public function jsonSerialize()
    {
        return array_filter(
            [
                'name' => $this->getName(),
                'email' => $this->getEmail()
            ],
            function ($value) {
                return $value !== null;
            }
        ) ?: null;
    }
}