guest_download_file.php

<?php
// Not including the guest header as we don't want any HTML output
require_once "config.php";

require_once "functions.php";


$ip = sanitizeInput(getIP());
$user_agent = sanitizeInput($_SERVER['HTTP_USER_AGENT']);

if (isset($_GET['id']) && isset($_GET['key'])) {
    $item_id = intval($_GET['id']);
    $item_key = sanitizeInput($_GET['key']);

    $sql = mysqli_query($mysqli, "SELECT * FROM shared_items WHERE item_id = $item_id AND item_key = '$item_key' AND item_expire_at > NOW() LIMIT 1");
    $row = mysqli_fetch_array($sql);

    // Check result
    if (mysqli_num_rows($sql) !== 1 || !$row) {
        exit("No file.");
    }

    // Check it is a file
    if ($row['item_type'] !== "File") {
        exit("Bad item type.");
    }

    // Check item share is active & hasn't been viewed too many times
    if ($row['item_active'] !== "1" || $row['item_views'] >= $row['item_view_limit']) {
        exit("Item cannot be viewed at this time.");
    }

    $item_related_id = intval($row['item_related_id']);
    $client_id = intval($row['item_client_id']);

    if (empty($row['item_views'])) {
        $item_views = 0;
    } else {
        $item_views = intval($row['item_views']);
    }

    $file_sql = mysqli_query($mysqli, "SELECT * FROM files WHERE file_id = $item_related_id AND file_client_id = $client_id LIMIT 1");
    $file_row = mysqli_fetch_array($file_sql);

    if (mysqli_num_rows($file_sql) !== 1 || !$file_row) {
        exit("No file.");
    }

    $file_name = sanitizeInput($file_row['file_name']);
    $file_ext = sanitizeInput($file_row['file_ext']);
    $file_reference_name = sanitizeInput($file_row['file_reference_name']);
    $client_id = intval($file_row['file_client_id']);
    $file_path = "uploads/clients/$client_id/$file_reference_name";

    // Display file as download
    $mime_type = mime_content_type($file_path);
    header('Content-type: '.$mime_type);
    header('Content-Disposition: attachment; filename=download.' . $file_ext);
    readfile($file_path);

    // Update file view count
    $new_item_views = $item_views + 1;
    mysqli_query($mysqli, "UPDATE shared_items SET item_views = $new_item_views WHERE item_id = $item_id");

    // Logging
    mysqli_query($mysqli, "INSERT INTO logs SET log_type = 'Sharing', log_action = 'View', log_description = 'Downloaded shared file $file_name via link', log_client_id = $client_id, log_ip = '$ip', log_user_agent = '$user_agent'");

}