function document_download()
{
global $Conf, $Me, $Opt;
$documentType = HotCRPDocument::parse_dtype(@$_REQUEST["dt"]);
if ($documentType === null) {
$documentType = @$_REQUEST["final"] ? DTYPE_FINAL : DTYPE_SUBMISSION;
}
$attachment_filename = false;
$docid = null;
if (isset($_REQUEST["p"])) {
$paperId = cvtint(@$_REQUEST["p"]);
} else {
if (isset($_REQUEST["paperId"])) {
$paperId = cvtint(@$_REQUEST["paperId"]);
} else {
$s = $orig_s = preg_replace(',\\A/*,', "", Navigation::path());
$documentType = $dtname = null;
if (str_starts_with($s, $Opt["downloadPrefix"])) {
$s = substr($s, strlen($Opt["downloadPrefix"]));
}
if (preg_match(',\\Ap(?:aper)?(\\d+)/+(.*)\\z,', $s, $m)) {
$paperId = intval($m[1]);
if (preg_match(',\\A([^/]+)\\.[^/]+\\z,', $m[2], $mm)) {
$dtname = $mm[1];
} else {
if (preg_match(',\\A([^/]+)/+(.*)\\z,', $m[2], $mm)) {
list($dtype, $attachment_filename) = array($m[1], $m[2]);
}
}
} else {
if (preg_match(',\\A(?:paper)?(\\d+)-?([-A-Za-z0-9_]*)(?:\\.[^/]+|/+(.*))\\z,', $s, $m)) {
list($paperId, $dtname, $attachment_filename) = array(intval($m[1]), $m[2], @$m[3]);
} else {
if (preg_match(',\\A([A-Za-z_][-A-Za-z0-9_]*?)?-?(\\d+)(?:\\.[^/]+|/+(.*))\\z,', $s, $m)) {
list($paperId, $dtname, $attachment_filename) = array(intval($m[2]), $m[1], @$m[3]);
}
}
}
if ($dtname !== null) {
$documentType = HotCRPDocument::parse_dtype($dtname ?: "paper");
}
if ($documentType !== null && $attachment_filename) {
$o = PaperOption::find($documentType);
if (!$o || $o->type != "attachments") {
$documentType = null;
}
}
}
}
if ($documentType === null) {
document_error("404 Not Found", "Unknown document “" . htmlspecialchars($orig_s) . "”.");
}
$prow = $Conf->paperRow($paperId, $Me, $whyNot);
if (!$prow) {
document_error("404 Not Found", whyNotText($whyNot, "view"));
} else {
if ($whyNot = $Me->perm_view_pdf($prow)) {
document_error("403 Forbidden", whyNotText($whyNot, "view"));
} else {
if ($documentType > 0 && !$Me->can_view_paper_option($prow, $documentType, true)) {
document_error("403 Forbidden", "You don’t have permission to view this document.");
}
}
}
if ($attachment_filename) {
$oa = $prow->option($documentType);
foreach ($oa ? $oa->documents($prow) : array() as $doc) {
if ($doc->unique_filename == $attachment_filename) {
$docid = $doc;
}
}
if (!$docid) {
document_error("404 Not Found", "No such attachment “" . htmlspecialchars($orig_s) . "”.");
}
}
// Actually download paper.
session_write_close();
// to allow concurrent clicks
if ($Conf->downloadPaper($prow, cvtint(@$_REQUEST["save"]) > 0, $documentType, $docid)) {
exit;
}
document_error("500 Server Error", null);
}
loadRows();
}
if (isset($_REQUEST["setfollow"]) && $prow && check_post()) {
PaperActions::set_follow($prow);
loadRows();
}
if ($prow && isset($_GET["m"]) && $_GET["m"] === "api" && isset($_GET["fn"]) && isset(SiteLoader::$api_map[$_GET["fn"]])) {
$Qreq = make_qreq();
SiteLoader::call_api($Qreq->fn, $Me, $Qreq, $prow);
json_exit(["ok" => false, "error" => "Internal error."]);
}
// check paper action
if (isset($_REQUEST["checkformat"]) && $prow && $Conf->setting("sub_banal")) {
$ajax = defval($_REQUEST, "ajax", 0);
$cf = new CheckFormat();
$dt = HotCRPDocument::parse_dtype(@$_REQUEST["dt"]);
if ($dt === null) {
$dt = @$_REQUEST["final"] ? DTYPE_FINAL : DTYPE_SUBMISSION;
}
if ($Conf->setting("sub_banal{$dt}")) {
$format = $Conf->setting_data("sub_banal{$dt}", "");
} else {
$format = $Conf->setting_data("sub_banal", "");
}
$status = $cf->analyzePaper($prow->paperId, $dt, $format);
// chairs get a hint message about multiple checking
if ($Me->privChair) {
$nbanal = $Conf->session("nbanal", 0) + 1;
$Conf->save_session("nbanal", $nbanal);
if ($nbanal >= 3 && $nbanal <= 6) {
$cf->msg("info", "To run the format checker for many papers, use Download > Format check on the <a href='" . hoturl("search", "q=") . "'>search page</a>.");
