mirror of
https://github.com/itflow-org/itflow
synced 2026-07-23 08:50:42 +00:00
117 lines
4.0 KiB
PHP
117 lines
4.0 KiB
PHP
<?php
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/*
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* ITFlow - GET /client/ticket_attachment.php
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* Client Portal - streams a ticket attachment for download or inline
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* viewing without exposing the uploads directory on-disk location
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*/
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require_once '../config.php';
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require_once '../includes/load_global_settings.php';
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require_once '../functions.php';
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require_once 'includes/check_login.php';
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require_once 'functions.php';
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// Require an attachment ID
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if (!isset($_GET['attachment_id'])) {
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http_response_code(400);
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exit("Attachment ID required");
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}
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$attachment_id = intval($_GET['attachment_id']);
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// Disposition: download by default, inline only when explicitly requested
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$disposition = "attachment";
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if (isset($_GET['action']) && $_GET['action'] == "view") {
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$disposition = "inline";
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}
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// Look up the attachment
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$sql = mysqli_query($mysqli, "SELECT * FROM ticket_attachments WHERE ticket_attachment_id = $attachment_id LIMIT 1");
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if (mysqli_num_rows($sql) !== 1) {
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http_response_code(404);
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exit("Attachment not found");
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}
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$row = mysqli_fetch_array($sql);
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$ticket_id = intval($row['ticket_attachment_ticket_id']);
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$attachment_name = $row['ticket_attachment_name'];
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$attachment_name_escaped = escapeSql($row['ticket_attachment_name']);
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$attachment_reference_name = $row['ticket_attachment_reference_name'];
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// Verify the contact can access this ticket (any state - attachments
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// on closed tickets remain downloadable)
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// 404 (not 403) so out-of-scope attachments are indistinguishable from
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// nonexistent ones
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if (!verifyContactTicketAccess($ticket_id, "Any")) {
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http_response_code(404);
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exit("Attachment not found");
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}
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// Build the on-disk path
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$uploads_base = realpath(__DIR__ . "/../uploads");
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$file_path = realpath(__DIR__ . "/../uploads/tickets/$ticket_id/$attachment_reference_name");
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// Path traversal guard - resolved path must stay inside uploads
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if ($file_path === false || $uploads_base === false || strpos($file_path, $uploads_base) !== 0) {
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http_response_code(404);
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exit("Attachment not found");
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}
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// No MIME column on ticket_attachments - detect from file content.
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// Attachments may come from email senders, so never trust a declared type.
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$finfo = finfo_open(FILEINFO_MIME_TYPE);
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$attachment_mime_type = finfo_file($finfo, $file_path);
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finfo_close($finfo);
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// MIME types that are safe to render inline in the browser
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// Everything else (esp. HTML/SVG - stored XSS risk) falls back to download
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$inline_allowed_mime_types = array(
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"application/pdf",
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"image/png",
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"image/jpeg",
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"image/gif",
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"image/webp",
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"text/plain"
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);
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if ($disposition == "inline" && !in_array($attachment_mime_type, $inline_allowed_mime_types, true)) {
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$disposition = "attachment";
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}
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// Strip characters that would break the Content-Disposition header
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$safe_attachment_name = str_replace(array('"', "\r", "\n"), "", basename($attachment_name));
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// Caching - allow the browser to reuse the file privately and revalidate cheaply
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$file_mtime = filemtime($file_path);
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$etag = '"' . md5($file_mtime . filesize($file_path) . $attachment_id) . '"';
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header("Cache-Control: private, max-age=3600");
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header("ETag: $etag");
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header("Last-Modified: " . gmdate("D, d M Y H:i:s", $file_mtime) . " GMT");
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// Conditional GET - browser already has this version, send 304 and stop
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if ((isset($_SERVER['HTTP_IF_NONE_MATCH']) && trim($_SERVER['HTTP_IF_NONE_MATCH']) == $etag)
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|| (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $file_mtime)
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) {
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http_response_code(304);
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exit;
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}
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// Audit log
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logAudit("Ticket", "Download", "Client contact $session_contact_name viewed ticket attachment $attachment_name_escaped via portal", $session_client_id);
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// Send the file
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header("Content-Type: $attachment_mime_type");
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header("Content-Disposition: $disposition; filename=\"$safe_attachment_name\"");
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header("Content-Length: " . filesize($file_path));
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header("X-Content-Type-Options: nosniff");
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// Clear output buffers so large files stream instead of loading into memory
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while (ob_get_level()) {
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ob_end_clean();
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}
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readfile($file_path);
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exit;
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