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<?php |
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/* |
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* ***************************************************************************** |
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* Contributions to this work were made on behalf of the GÉANT project, a |
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* project that has received funding from the European Union’s Framework |
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* Programme 7 under Grant Agreements No. 238875 (GN3) and No. 605243 (GN3plus), |
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* Horizon 2020 research and innovation programme under Grant Agreements No. |
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* 691567 (GN4-1) and No. 731122 (GN4-2). |
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* On behalf of the aforementioned projects, GEANT Association is the sole owner |
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* of the copyright in all material which was developed by a member of the GÉANT |
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* project. GÉANT Vereniging (Association) is registered with the Chamber of |
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* Commerce in Amsterdam with registration number 40535155 and operates in the |
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* UK as a branch of GÉANT Vereniging. |
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* |
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* Registered office: Hoekenrode 3, 1102BR Amsterdam, The Netherlands. |
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* UK branch address: City House, 126-130 Hills Road, Cambridge CB2 1PQ, UK |
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* |
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* License: see the web/copyright.inc.php file in the file structure or |
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* <base_url>/copyright.php after deploying the software |
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*/ |
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namespace core\common; |
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/** |
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* This class contains a number of functions for talking to the outside world |
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* @author Stefan Winter <[email protected]> |
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* @author Tomasz Wolniewicz <[email protected]> |
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* @author Maja Górecka-Wolniewicz <[email protected]> |
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* |
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* @package Developer |
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*/ |
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class OutsideComm extends Entity |
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{ |
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/** |
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* downloads a file from the internet |
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* @param string $url the URL to download |
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* @param int $timeout the timeout to download |
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* @return string|boolean the data we got back, or FALSE on failure |
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*/ |
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public static function downloadFile($url, $timeout=0) |
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{ |
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$loggerInstance = new \core\common\Logging(); |
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if (!preg_match("/:\/\//", $url)) { |
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$loggerInstance->debug(3, "The specified string does not seem to be a URL!"); |
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return FALSE; |
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} |
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# we got a URL, download it |
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if ($timeout > 0) { |
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$download = @fopen($url, 'rb', false, stream_context_create(['http' => ['timeout' => $timeout]])); |
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} else { |
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$download = fopen($url, "rb"); |
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} |
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if ($download === FALSE) { |
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$loggerInstance->debug(2, "Failed to open handle for $url \n"); |
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return FALSE; |
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} |
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$data = stream_get_contents($download); |
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if ($data === FALSE) { |
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$loggerInstance->debug(2, "Failed to download the file from $url"); |
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return FALSE; |
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} |
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return $data; |
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} |
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/** |
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* create an email handle from PHPMailer for later customisation and sending |
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* @return \PHPMailer\PHPMailer\PHPMailer |
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*/ |
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public static function mailHandle() |
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{ |
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// use PHPMailer to send the mail |
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$mail = new \PHPMailer\PHPMailer\PHPMailer(); |
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$mail->isSMTP(); |
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$mail->Port = 587; |
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$mail->SMTPSecure = 'tls'; |
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$mail->Host = \config\Master::MAILSETTINGS['host']; |
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if (\config\Master::MAILSETTINGS['user'] === NULL && \config\Master::MAILSETTINGS['pass'] === NULL) { |
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$mail->SMTPAuth = false; |
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} else { |
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$mail->SMTPAuth = true; |
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$mail->Username = \config\Master::MAILSETTINGS['user']; |
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$mail->Password = \config\Master::MAILSETTINGS['pass']; |
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} |
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$mail->SMTPOptions = \config\Master::MAILSETTINGS['options']; |
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// formatting nitty-gritty |
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$mail->WordWrap = 72; |
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$mail->isHTML(FALSE); |
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$mail->CharSet = 'UTF-8'; |
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$configuredFrom = \config\Master::APPEARANCE['from-mail']; |
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$mail->From = $configuredFrom; |
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// are we fancy? i.e. S/MIME signing? |
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if (isset(\config\Master::MAILSETTINGS['certfilename'], \config\Master::MAILSETTINGS['keyfilename'], \config\Master::MAILSETTINGS['keypass'])) { |
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$mail->sign(\config\Master::MAILSETTINGS['certfilename'], \config\Master::MAILSETTINGS['keyfilename'], \config\Master::MAILSETTINGS['keypass']); |
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} |
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return $mail; |
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} |
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const MAILDOMAIN_INVALID = -1000; |
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const MAILDOMAIN_NO_MX = -1001; |
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const MAILDOMAIN_NO_HOST = -1002; |
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const MAILDOMAIN_NO_CONNECT = -1003; |
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const MAILDOMAIN_NO_STARTTLS = 1; |
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const MAILDOMAIN_STARTTLS = 2; |
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/** |
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* verifies whether a mail address is in an existing and STARTTLS enabled mail domain |
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* |
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* @param string $address the mail address to check |
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* @return int status of the mail domain |
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*/ |
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public static function mailAddressValidSecure($address) |
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{ |
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$loggerInstance = new \core\common\Logging(); |
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if (!filter_var($address, FILTER_VALIDATE_EMAIL)) { |
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$loggerInstance->debug(4, "OutsideComm::mailAddressValidSecure: invalid mail address."); |
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return OutsideComm::MAILDOMAIN_INVALID; |
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} |
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$domain = substr($address, strpos($address, '@') + 1); // everything after the @ sign |
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// we can be sure that the @ was found (FILTER_VALIDATE_EMAIL succeeded) |
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// but let's be explicit |
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if ($domain === FALSE) { |
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return OutsideComm::MAILDOMAIN_INVALID; |
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} |
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// does the domain have MX records? |
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$mx = dns_get_record($domain, DNS_MX); |
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if ($mx === FALSE) { |
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$loggerInstance->debug(4, "OutsideComm::mailAddressValidSecure: no MX."); |
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return OutsideComm::MAILDOMAIN_NO_MX; |
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} |
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$loggerInstance->debug(5, "Domain: $domain MX: " . /** @scrutinizer ignore-type */ print_r($mx, TRUE)); |
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// create a pool of A and AAAA records for all the MXes |
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$ipAddrs = []; |
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foreach ($mx as $onemx) { |
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$v4list = dns_get_record($onemx['target'], DNS_A); |
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$v6list = dns_get_record($onemx['target'], DNS_AAAA); |
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foreach ($v4list as $oneipv4) { |
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$ipAddrs[] = $oneipv4['ip']; |
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} |
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foreach ($v6list as $oneipv6) { |
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$ipAddrs[] = "[" . $oneipv6['ipv6'] . "]"; |
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} |
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} |
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if (count($ipAddrs) == 0) { |
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$loggerInstance->debug(4, "OutsideComm::mailAddressValidSecure: no mailserver hosts."); |
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return OutsideComm::MAILDOMAIN_NO_HOST; |
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} |
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$loggerInstance->debug(5, "Domain: $domain Addrs: " . /** @scrutinizer ignore-type */ print_r($ipAddrs, TRUE)); |
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// connect to all hosts. If all can't connect, return MAILDOMAIN_NO_CONNECT. |
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// If at least one does not support STARTTLS or one of the hosts doesn't connect |
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// , return MAILDOMAIN_NO_STARTTLS (one which we can't connect to we also |
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// can't verify if it's doing STARTTLS, so better safe than sorry. |
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$retval = OutsideComm::MAILDOMAIN_NO_CONNECT; |
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$allWithStarttls = TRUE; |
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foreach ($ipAddrs as $oneip) { |
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$loggerInstance->debug(5, "OutsideComm::mailAddressValidSecure: connecting to $oneip."); |
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$smtp = new \PHPMailer\PHPMailer\SMTP; |
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if ($smtp->connect($oneip, 25)) { |
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// host reached! so at least it's not a NO_CONNECT |
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$loggerInstance->debug(4, "OutsideComm::mailAddressValidSecure: connected to $oneip."); |
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$retval = OutsideComm::MAILDOMAIN_NO_STARTTLS; |
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if ($smtp->hello('eduroam.org')) { |
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$extensions = $smtp->getServerExtList(); // Scrutinzer is wrong; is not always null - contains server capabilities |
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if (!is_array($extensions) || !array_key_exists('STARTTLS', $extensions)) { |
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$loggerInstance->debug(4, "OutsideComm::mailAddressValidSecure: no indication for STARTTLS."); |
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$allWithStarttls = FALSE; |
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} |
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} |
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} else { |
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// no connect: then we can't claim all targets have STARTTLS |
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$allWithStarttls = FALSE; |
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$loggerInstance->debug(5, "OutsideComm::mailAddressValidSecure: failed $oneip."); |
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} |
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} |
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// did the state $allWithStarttls survive? Then up the response to |
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// appropriate level. |
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if ($retval == OutsideComm::MAILDOMAIN_NO_STARTTLS && $allWithStarttls) { |
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$retval = OutsideComm::MAILDOMAIN_STARTTLS; |
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} |
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return $retval; |
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} |
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const SMS_SENT = 100; |
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const SMS_NOTSENT = 101; |
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const SMS_FRAGEMENTSLOST = 102; |
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/** |
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* Send SMS invitations to end users |
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* |
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* @param string $number the number to send to: with country prefix, but without the + sign ("352123456" for a Luxembourg example) |
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* @param string $content the text to send |
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* @return integer status of the sending process |
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* @throws \Exception |
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*/ |
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public static function sendSMS($number, $content) |
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{ |
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$loggerInstance = new \core\common\Logging(); |
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switch (\config\ConfAssistant::SMSSETTINGS['provider']) { |
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case 'Nexmo': |
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// taken from https://docs.nexmo.com/messaging/sms-api |
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$url = 'https://rest.nexmo.com/sms/json?' . http_build_query( |
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[ |
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'api_key' => \config\ConfAssistant::SMSSETTINGS['username'], |
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'api_secret' => \config\ConfAssistant::SMSSETTINGS['password'], |
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'to' => $number, |
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'from' => \config\ConfAssistant::CONSORTIUM['name'], |
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'text' => $content, |
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'type' => 'unicode', |
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] |
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); |
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$ch = curl_init($url); |
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if ($ch === FALSE) { |
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$loggerInstance->debug(2, 'Problem with SMS invitation: unable to send API request with CURL!'); |
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return OutsideComm::SMS_NOTSENT; |
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} |
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); |
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$response = curl_exec($ch); |
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// we have set RETURNTRANSFER so anything except string means something went wrong |
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if (!is_string($response)) { |
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throw new \Exception("Error while sending API request with SMS: curl did not deliver a response string."); |
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} |
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$decoded_response = json_decode($response, true); |
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$messageCount = $decoded_response['message-count']; |
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curl_close($ch); |
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if ($messageCount == 0) { |
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$loggerInstance->debug(2, 'Problem with SMS invitation: no message was sent!'); |
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return OutsideComm::SMS_NOTSENT; |
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} |
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$loggerInstance->debug(2, 'Total of ' . $messageCount . ' messages were attempted to send.'); |
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$totalFailures = 0; |
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foreach ($decoded_response['messages'] as $message) { |
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if ($message['status'] == 0) { |
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$loggerInstance->debug(2, $message['message-id'] . ": Success"); |
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} else { |
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$loggerInstance->debug(2, $message['message-id'] . ": Failed (failure code = " . $message['status'] . ")"); |
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$totalFailures++; |
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} |
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} |
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if ($messageCount == count($decoded_response['messages']) && $totalFailures == 0) { |
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return OutsideComm::SMS_SENT; |
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} |
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return OutsideComm::SMS_FRAGEMENTSLOST; |
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default: |
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throw new \Exception("Unknown SMS Gateway provider!"); |
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} |
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} |
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const INVITE_CONTEXTS = [ |
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0 => "CO-ADMIN", |
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1 => "NEW-FED", |
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2 => "EXISTING-FED", |
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]; |
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/** |
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* |
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* @param string $targets one or more mail addresses, comma-separated |
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* @param string $introtext introductory sentence (varies by situation) |
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* @param string $newtoken the token to send |
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* @param string $idpPrettyName the name of the IdP, in best-match language |
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* @param \core\Federation $federation if not NULL, indicates that invitation comes from authorised fed admin of that federation |
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* @param string $type the type of participant we're invited to |
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* @return array |
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* @throws \Exception |
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*/ |
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public static function adminInvitationMail($targets, $introtext, $newtoken, $idpPrettyName, $federation, $type) |
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{ |
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if (!in_array($introtext, OutsideComm::INVITE_CONTEXTS)) { |
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throw new \Exception("Unknown invite mode!"); |
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} |
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if ($introtext == OutsideComm::INVITE_CONTEXTS[1] && $federation === NULL) { // comes from fed admin, so federation must be set |
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throw new \Exception("Invitation from a fed admin, but we do not know the corresponding federation!"); |
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} |
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$prettyPrintType = ""; |
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switch ($type) { |
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case \core\IdP::TYPE_IDP: |
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$prettyPrintType = Entity::$nomenclature_idp; |
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break; |
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case \core\IdP::TYPE_SP: |
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$prettyPrintType = Entity::$nomenclature_hotspot; |
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break; |
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case \core\IdP::TYPE_IDPSP: |
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287
|
|
|
$prettyPrintType = sprintf(_("%s and %s"), Entity::$nomenclature_idp, Entity::$nomenclature_hotspot); |
|
288
|
|
|
break; |
|
289
|
|
|
default: |
|
290
|
|
|
throw new \Exception("This is controlled vocabulary, impossible."); |
|
291
|
|
|
} |
|
292
|
|
|
Entity::intoThePotatoes(); |
|
293
|
|
|
$mail = OutsideComm::mailHandle(); |
|
294
|
|
|
new \core\CAT(); // makes sure Entity is initialised |
|
295
|
|
|
// we have a few stock intro texts on file |
|
296
|
|
|
$introTexts = [ |
|
297
|
|
|
OutsideComm::INVITE_CONTEXTS[0] => sprintf(_("a %s of the %s %s \"%s\" has invited you to manage the %s together with them."), Entity::$nomenclature_fed, \config\ConfAssistant::CONSORTIUM['display_name'], Entity::$nomenclature_participant, $idpPrettyName, Entity::$nomenclature_participant), |
|
298
|
|
|
OutsideComm::INVITE_CONTEXTS[1] => sprintf(_("a %s %s has invited you to manage the future %s \"%s\" (%s). The organisation will be a %s."), \config\ConfAssistant::CONSORTIUM['display_name'], Entity::$nomenclature_fed, Entity::$nomenclature_participant, $idpPrettyName, strtoupper($federation->tld), $prettyPrintType), |
|
299
|
|
|
OutsideComm::INVITE_CONTEXTS[2] => sprintf(_("a %s %s has invited you to manage the %s \"%s\". This is a %s."), \config\ConfAssistant::CONSORTIUM['display_name'], Entity::$nomenclature_fed, Entity::$nomenclature_participant, $idpPrettyName, $prettyPrintType), |
|
300
|
|
|
]; |
|
301
|
|
|
$validity = sprintf(_("This invitation is valid for 24 hours from now, i.e. until %s."), strftime("%x %X %Z", time() + 86400)); |
|
302
|
|
|
// need some nomenclature |
|
303
|
|
|
// are we on https? |
|
304
|
|
|
$proto = "http://"; |
|
305
|
|
|
if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == "on") { |
|
306
|
|
|
$proto = "https://"; |
|
307
|
|
|
} |
|
308
|
|
|
// then, send out the mail |
|
309
|
|
|
$message = _("Hello,") . "\n\n" . wordwrap($introTexts[$introtext] . " " . $validity, 72) . "\n\n"; |
|
310
|
|
|
// default means we don't have a Reply-To. |
|
311
|
|
|
$replyToMessage = wordwrap(_("manually. Please do not reply to this mail; this is a send-only address.")); |
|
312
|
|
|
|
|
313
|
|
|
if ($federation !== NULL) { |
|
314
|
|
|
// see if we are supposed to add a custom message |
|
315
|
|
|
$customtext = $federation->getAttributes('fed:custominvite'); |
|
316
|
|
|
if (count($customtext) > 0) { |
|
317
|
|
|
$message .= wordwrap(sprintf(_("Additional message from your %s administrator:"), Entity::$nomenclature_fed), 72) . "\n---------------------------------" . |
|
318
|
|
|
wordwrap($customtext[0]['value'], 72) . "\n---------------------------------\n\n"; |
|
319
|
|
|
} |
|
320
|
|
|
// and add Reply-To already now |
|
321
|
|
|
foreach ($federation->listFederationAdmins() as $fedadmin_id) { |
|
322
|
|
|
$fedadmin = new \core\User($fedadmin_id); |
|
323
|
|
|
$mailaddrAttrib = $fedadmin->getAttributes("user:email"); |
|
324
|
|
|
$nameAttrib = $fedadmin->getAttributes("user:realname"); |
|
325
|
|
|
$name = $nameAttrib[0]['value'] ?? sprintf(_("%s administrator"), Entity::$nomenclature_fed); |
|
326
|
|
|
if (count($mailaddrAttrib) > 0) { |
|
327
|
|
|
$mail->addReplyTo($mailaddrAttrib[0]['value'], $name); |
|
328
|
|
|
$replyToMessage = wordwrap(sprintf(_("manually. If you reply to this mail, you will reach your %s administrators."), Entity::$nomenclature_fed), 72); |
|
329
|
|
|
} |
|
330
|
|
|
} |
|
331
|
|
|
} |
|
332
|
|
|
$productname = \config\Master::APPEARANCE['productname']; |
|
333
|
|
|
$consortium = \config\ConfAssistant::CONSORTIUM['display_name']; |
|
334
|
|
|
$message .= wordwrap(sprintf(_("To enlist as an administrator for that %s, please click on the following link:"), Entity::$nomenclature_participant), 72) . "\n\n" . |
|
335
|
|
|
$proto . $_SERVER['SERVER_NAME'] . \config\Master::PATHS['cat_base_url'] . "admin/action_enrollment.php?token=$newtoken\n\n" . |
|
336
|
|
|
wordwrap(sprintf(_("If clicking the link doesn't work, you can also go to the %s Administrator Interface at"), $productname), 72) . "\n\n" . |
|
337
|
|
|
$proto . $_SERVER['SERVER_NAME'] . \config\Master::PATHS['cat_base_url'] . "admin/\n\n" . |
|
338
|
|
|
_("and enter the invitation token") . "\n\n" . |
|
339
|
|
|
$newtoken . "\n\n$replyToMessage\n\n" . |
|
340
|
|
|
wordwrap(_("Do NOT forward the mail before the token has expired - or the recipients may be able to consume the token on your behalf!"), 72) . "\n\n" . |
|
341
|
|
|
wordwrap(sprintf(_("We wish you a lot of fun with the %s."), $productname), 72) . "\n\n" . |
|
342
|
|
|
sprintf(_("Sincerely,\n\nYour friendly folks from %s Operations"), $consortium); |
|
343
|
|
|
|
|
344
|
|
|
|
|
345
|
|
|
// who to whom? |
|
346
|
|
|
$mail->FromName = \config\Master::APPEARANCE['productname'] . " Invitation System"; |
|
347
|
|
|
|
|
348
|
|
|
if (isset(\config\Master::APPEARANCE['invitation-bcc-mail']) && \config\Master::APPEARANCE['invitation-bcc-mail'] !== NULL) { |
|
349
|
|
|
$mail->addBCC(\config\Master::APPEARANCE['invitation-bcc-mail']); |
|
350
|
|
|
} |
|
351
|
|
|
|
|
352
|
|
|
// all addresses are wrapped in a string, but PHPMailer needs a structured list of addressees |
|
353
|
|
|
// sigh... so convert as needed |
|
354
|
|
|
// first split multiple into one if needed |
|
355
|
|
|
$recipients = explode(", ", $targets); |
|
356
|
|
|
|
|
357
|
|
|
$secStatus = TRUE; |
|
358
|
|
|
$domainStatus = TRUE; |
|
359
|
|
|
|
|
360
|
|
|
// fill the destinations in PHPMailer API |
|
361
|
|
|
foreach ($recipients as $recipient) { |
|
362
|
|
|
$mail->addAddress($recipient); |
|
363
|
|
|
$status = OutsideComm::mailAddressValidSecure($recipient); |
|
364
|
|
|
if ($status < OutsideComm::MAILDOMAIN_STARTTLS) { |
|
365
|
|
|
$secStatus = FALSE; |
|
366
|
|
|
} |
|
367
|
|
|
if ($status < 0) { |
|
368
|
|
|
$domainStatus = FALSE; |
|
369
|
|
|
} |
|
370
|
|
|
} |
|
371
|
|
|
Entity::outOfThePotatoes(); |
|
372
|
|
|
if (!$domainStatus) { |
|
373
|
|
|
return ["SENT" => FALSE, "TRANSPORT" => FALSE]; |
|
374
|
|
|
} |
|
375
|
|
|
|
|
376
|
|
|
// what do we want to say? |
|
377
|
|
|
Entity::intoThePotatoes(); |
|
378
|
|
|
$mail->Subject = sprintf(_("%s: you have been invited to manage an %s"), \config\Master::APPEARANCE['productname'], Entity::$nomenclature_participant); |
|
379
|
|
|
Entity::outOfThePotatoes(); |
|
380
|
|
|
$mail->Body = $message; |
|
381
|
|
|
return ["SENT" => $mail->send(), "TRANSPORT" => $secStatus]; |
|
382
|
|
|
} |
|
383
|
|
|
|
|
384
|
|
|
/** |
|
385
|
|
|
* sends a POST with some JSON inside |
|
386
|
|
|
* |
|
387
|
|
|
* @param string $url the URL to POST to |
|
388
|
|
|
* @param array $dataArray the data to be sent in PHP array representation |
|
389
|
|
|
* @return array the JSON response, decoded into PHP associative array |
|
390
|
|
|
* @throws \Exception |
|
391
|
|
|
*/ |
|
392
|
|
|
public static function postJson($url, $dataArray) |
|
393
|
|
|
{ |
|
394
|
|
|
$loggerInstance = new Logging(); |
|
395
|
|
|
$ch = \curl_init($url); |
|
396
|
|
|
if ($ch === FALSE) { |
|
397
|
|
|
$loggerInstance->debug(2, "Unable to POST JSON request: CURL init failed!"); |
|
398
|
|
|
return json_decode(json_encode(FALSE), TRUE); |
|
399
|
|
|
} |
|
400
|
|
|
\curl_setopt_array($ch, array( |
|
401
|
|
|
CURLOPT_POST => TRUE, |
|
402
|
|
|
CURLOPT_RETURNTRANSFER => TRUE, |
|
403
|
|
|
CURLOPT_POSTFIELDS => json_encode($dataArray), |
|
404
|
|
|
CURLOPT_FRESH_CONNECT => TRUE, |
|
405
|
|
|
)); |
|
406
|
|
|
$response = \curl_exec($ch); |
|
407
|
|
|
if (!is_string($response)) { // With RETURNTRANSFER, TRUE is not a valid return |
|
408
|
|
|
throw new \Exception("the POST didn't work!"); |
|
409
|
|
|
} |
|
410
|
|
|
return json_decode($response, TRUE); |
|
411
|
|
|
} |
|
412
|
|
|
|
|
413
|
|
|
/** |
|
414
|
|
|
* aborts code execution if a required mail address is invalid |
|
415
|
|
|
* |
|
416
|
|
|
* @param mixed $newmailaddress input string, possibly one or more mail addresses |
|
417
|
|
|
* @return array mail addresses that passed validation |
|
418
|
|
|
*/ |
|
419
|
|
|
public static function exfiltrateValidAddresses($newmailaddress) |
|
420
|
|
|
{ |
|
421
|
|
|
$validator = new \web\lib\common\InputValidation(); |
|
422
|
|
|
$addressSegments = explode(",", $newmailaddress); |
|
423
|
|
|
$confirmedMails = []; |
|
424
|
|
|
if ($addressSegments === FALSE) { |
|
425
|
|
|
return []; |
|
426
|
|
|
} |
|
427
|
|
|
foreach ($addressSegments as $oneAddressCandidate) { |
|
428
|
|
|
$candidate = trim($oneAddressCandidate); |
|
429
|
|
|
if ($validator->email($candidate) !== FALSE) { |
|
430
|
|
|
$confirmedMails[] = $candidate; |
|
431
|
|
|
} |
|
432
|
|
|
} |
|
433
|
|
|
if (count($confirmedMails) == 0) { |
|
434
|
|
|
return []; |
|
435
|
|
|
} |
|
436
|
|
|
return $confirmedMails; |
|
437
|
|
|
} |
|
438
|
|
|
/** |
|
439
|
|
|
* performs an HTTP request. Currently unused, will be for external CA API calls. |
|
440
|
|
|
* |
|
441
|
|
|
* @param string $url the URL to send the request to |
|
442
|
|
|
* @param array $postValues POST values to send |
|
443
|
|
|
* @return string the returned HTTP content |
|
444
|
|
|
|
|
445
|
|
|
public static function PostHttp($url, $postValues) { |
|
446
|
|
|
$options = [ |
|
447
|
|
|
'http' => ['header' => 'Content-type: application/x-www-form-urlencoded\r\n', "method" => 'POST', 'content' => http_build_query($postValues)] |
|
448
|
|
|
]; |
|
449
|
|
|
$context = stream_context_create($options); |
|
450
|
|
|
return file_get_contents($url, false, $context); |
|
451
|
|
|
} |
|
452
|
|
|
* |
|
453
|
|
|
*/ |
|
454
|
|
|
} |
|
455
|
|
|
|
GEANT /
CAT
