iCalendar.php

<?php

require_once __DIR__ . '/../mail/v5_2/PHPMailerAutoload.php';

/**
 * Classe para criar e enviar por email agendamentos
 *
 * MODO DE USO
 * Instacie a classe
 * $invite = new InviteICS('email do organizador', 'nome do organizador', 'tipo de evento', 'codigo');
 *
 * Informe a data de inicio e data de final do evento
 * $invite->setDates('2021-12-23 19:00:00', '2021-12-23 20:00:00');
 *
 * Informe o local do evento
 * $invite->setLocation('nome do local', 'email do local');
 *
 * Informe todos os participantes
 * $invite->addAttendee('nome','email', 'status');
 * $invite->addAttendee('nome','email', 'status');
 *
 * Adicione as regras caso necessário
 * $invite->addRule('tipo', "{$data_fin}T{$hora_fin}", 'dias_semana');
 *
 * Execute o método para cadastrar e enviar o agendamento
 * $enviar = $invite->sendInvite('assunto', 'mensagem');
 */
class InviteICS
{

    protected $code_invite;
    protected $curr_date;
    protected $event_date_ini;
    protected $event_date_fin;
    protected $organizer;
    protected $location;
    protected $attendees;
    protected $rules;
    protected $method;
    protected $subject;
    protected $mail;

    /**
     * @param string $organizer_email
     * @param string $organizer_name
     * @param string $method [REQUEST, REPLY, CANCEL]
     * @param string $uid
     */
    public function __construct($organizer_email, $organizer_name, $method = 'REQUEST', $uid = null)
    {
        $curr_date = new DateTime();

        $this->code_invite = $uid ? $uid : md5('ibrap_' . date('d/m/y-h-i-s'));
        $this->curr_date = $this->formataData($curr_date);

        $organizer = new stdClass;
        $organizer->name = $organizer_name;
        $organizer->email = $organizer_email;
        $this->organizer = $organizer;
        $this->method = $method;

        $this->location = '';
        $this->attendees = '';
        $this->rules = '';

        $this->emailInicializa();
    }

    /**
     * @param string $subject
     * @param string $desctiption
     */
    public function sendInvite($subject, $desctiption)
    {
        $this->subject = utf8_encode($subject);

        $invite = $this->geraInvite($desctiption);

        // Para salvar o arquivo ao invés de enviar, remova o comentário da linha abaixo
        // return file_put_contents($this->curr_date . $this->code_invite.".ics", $invite);

        return $this->mandaEmail($invite);
    }

    /**
     * @param string $event_ini [data de início do evento]
     * @param string $event_end [data de fim do evento]
     * @return void
     */
    public function setDates($event_ini, $event_end)
    {
        $ini = new DateTime($event_ini);
        $end = new DateTime($event_end);

        $this->event_date_ini = $this->formataData($ini);
        $this->event_date_fin = $this->formataData($end);
    }

    /**
     * @param string $name [nome do local ou veiculo reservado]
     * @param string $email [email do local ou veiculo reservado]
     */
    public function setLocation($name, $email)
    {
        $location = new stdClass;
        $location->name = $name;
        $location->email = $email;

        $this->location = "LOCATION:{$location->name} <{$location->email}>" . PHP_EOL;

        return $this;
    }

    /**
     * @param string $name [nome de quem vai receber a notificacao]
     * @param string $email [email de quem vai receber a notificacao]
     * @param string $status [ACCEPTED, DECLINED, NEEDS-ACTION]
     */
    public function addAttendee($name, $email, $status)
    {
        $attendee = new stdClass;
        $attendee->name = $name;
        $attendee->email = $email;
        $attendee->status = $status;

        $this->attendees .= "ATTENDEE;RSVP=TRUE;PARTSTAT={$attendee->status};CN={$attendee->name}:{$attendee->email};MAILTO:{$attendee->email}" . PHP_EOL;
        $this->mail->addAddress($attendee->email, $attendee->name);

        return $this;
    }

    /**
     * @param string $frequencia [DAILY,WEEKLY,MONTHLY]
     * @param string $periodo [YYYYMMDDTHHIISS]
     * @param string $dias [SU,MO,TU,WE,TH,FR,SA]
     */
    public function addRule($frequencia, $periodo, $dias)
    {
        $rule = new stdClass;
        $rule->frequencia = $frequencia;
        $rule->periodo = $periodo;
        $rule->dias = $dias;

        $byday = $frequencia != 'MONTHLY' ? 'BYDAY' : 'BYMONTHDAY';

        $this->rules .= "RRULE:INTERVAL=1;FREQ={$rule->frequencia};UNTIL={$rule->periodo};{$byday}={$rule->dias} " . PHP_EOL;

        return $this;
    }

    /**
     * @param string $description
     */
    private function geraInvite(
        $description
    ) {

        $header = "BEGIN:VCALENDAR\nVERSION:2.0\nPRODID:Zimbra-Calendar-Provider\nMETHOD:{$this->method}\nBEGIN:VEVENT\nORGANIZER;SENT-BY=MAILTO:{$this->organizer->name}\n";

        $footer = "BEGIN:VALARM\nTRIGGER:-PT15M\nACTION:DISPLAY\nDESCRIPTION:Lembrar\nEND:VALARM\nEND:VEVENT\nEND:VCALENDAR\n";

        return "{$header}UID:{$this->code_invite}\n{$this->rules}{$this->attendees}DTSTAMPTZID=America/Sao_Paulo:{$this->curr_date}\nDTSTART;TZID=America/Sao_Paulo:{$this->event_date_ini}\nDTEND;TZID=America/Sao_Paulo:{$this->event_date_fin}\n{$this->location}SUBJECT:{$this->subject}\nDESCRIPTION:{$description}\n{$footer}";

    }

    private function mandaEmail($ical)
    {
        $this->mail->Subject = $this->subject;

        $this->mail->addStringAttachment($ical, "meeting.ics", "7bit", "text/calendar; charset=utf-8; method={$this->method}");

        $this->mail->Ical = $ical;
        $this->mail->Body = $ical;

        return $this->mail->send();
    }

    private function emailInicializa()
    {
        $mail = new PHPMailer();
        // $mail->SMTPDebug = 2;
        $mail->isSMTP();
        $mail->isHTML(false);
        $mail->ContentType = 'text/calendar';

        $mail->Host = ""; // Endereço do servidor SMTP
        $mail->SMTPSecure = "tls";
        $mail->Port = 25; // Porta do SMTP
        $mail->SMTPAuth = true; // turn on SMTP authentication
        $mail->Username = 'usuario@email.com'; // Usuário do servidor SMTP
        $mail->Password = 'senha'; // Senha do servidor SMTP

        $mail->From = $this->organizer->email;
        $mail->FromName = $this->organizer->name;

        $this->mail = $mail;
    }

    private function formataData($date)
    {
        $dateFormated = $date->format('Ymd-His');
        return str_replace('-', 'T', $dateFormated);
    }
}