3) {
$groups = array_slice($groups, 0, 3);
}
$newsgroups = implode(', ', $groups);
// Build raw email with dummy To for sendmail -t
$headers = [];
$headers[] = "From: $from";
$headers[] = "To: mail2news@localhost";
$headers[] = "Newsgroups: $newsgroups";
$headers[] = "Subject: $subject";
if ($references) {
$headers[] = "References: $references";
}
// PoW header
$headers[] = "X-Hashcash: $hashcash";
// Enforce signature immediately after PoW
$headers[] = "X-Ed25519-Sig: $sig";
// Optionally include public key header
if ($pubkey) {
$headers[] = "X-Ed25519-Pub: $pubkey";
}
$headers[] = "X-No-Archive: Yes";
$headers[] = "Mime-Version: 1.0";
$headers[] = "Content-Type: text/plain; charset=UTF-8";
$headers[] = "Content-Transfer-Encoding: 7bit";
$headers[] = ""; // end of headers
$rawEmail = implode("\r\n", $headers) . "\r\n" . $message . "\r\n";
// Send via sendmail using mail2news transport
$sendmail = '/usr/sbin/sendmail';
$cmd = escapeshellcmd($sendmail) . ' -i -oTransport=mail2news -t';
$descriptors = [
0 => ['pipe', 'r'], // stdin
1 => ['pipe', 'w'], // stdout
2 => ['pipe', 'w'], // stderr
];
$process = proc_open($cmd, $descriptors, $pipes);
if (!is_resource($process)) {
http_response_code(500);
echo "Failed to invoke sendmail.";
exit;
}
// Write the raw email
fwrite($pipes[0], $rawEmail);
fclose($pipes[0]);
// Capture and close outputs
$stderr = stream_get_contents($pipes[2]);
fclose($pipes[1]);
fclose($pipes[2]);
$returnCode = proc_close($process);
if ($returnCode !== 0) {
http_response_code(500);
echo "Sendmail error (code {$returnCode}):\n" . nl2br(htmlspecialchars($stderr));
exit;
}
// Success page
?>
Message Sent
Message Sent Successfully
Your post has been handed off to the mail2news transport.
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