<Files dl_video*>
<IfModule mod_xsendfile.c>
# 啟用 xsendfile
XSendFile On
SetEnv MOD_X_SENDFILE_ENABLED 1
</IfModule>
<IfModule mod_limitipconn.c>
# 限制每一IP同時連線的數目
MaxConnPerIP 8
</IfModule>
<IfModule mod_ratelimit.c>
# 限制下載速率 850KB/s
SetOutputFilter RATE_LIMIT
SetEnv rate-limit 850
</IfModule>
</Files>PHP 的程式長得像下面這樣，只要設定 header，就會轉由 Apache 控制下載。
// 權限檢查 .....
// 檔案檢查 .....
// .....
header("X-Sendfile: {$fullname}");
header("Content-type: application/octet-stream");
header('Content-Disposition: attachment; filename="' . basename($fname) . '"');注意，$fullname 是檔案系統中的實際目錄名稱，例如
/var/www/html/mp4_files/105S101.mp4原先的環境是使用 CentOS，但其已於數年前被宣告死亡，只能再找其他途徑。使用 docker.hub 的 PHP 官方 image -- php:7.4.33-apache-bullseye，bullseye 為 Debian 當前的舊的穩定（oldstable）版。
Debian 官方沒有 mod_limitipconn，必須自己下載編譯安裝。變通的方式，是在 docker 中編譯好，把用到的檔案 copy 出來。
apt install apache2-dev wget
wget https://dominia.org/djao/limit/mod_limitipconn-0.24.tar.bz2
tar -xvf mod_limitipconn-0.24.tar.bz2
cd mod_limitipconn-0.24
make
make install
--
## 需要的檔案是下面兩個
/usr/lib/apache2/modules/mod_limitipconn.so
/etc/apache2/mods-available/limitipconn.loadDockerfile 如下。
# Debian 當前的舊的穩定（oldstable）版
FROM php:7.4.33-apache-bullseye
# Install required extensions
# libicu-dev -- required by php ext: intl
# libpq-dev -- required by php ext: pgsql pdo_pgsql
# libonig-dev -- required by php ext: mbstring
RUN apt-get update && \
apt-get -y install libapache2-mod-xsendfile \
libicu-dev libpq-dev libonig-dev \
&& docker-php-ext-install intl pdo \
mysqli pdo_mysql pgsql pdo_pgsql \
mbstring
COPY conf/ocw_vod_dl.conf /etc/apache2/conf-enabled
COPY conf/mod_limitipconn.so /usr/lib/apache2/modules
COPY conf/limitipconn.load /etc/apache2/mods-available
RUN a2enmod headers limitipconn ratelimit xsendfile
EXPOSE 80
CMD ["apache2-foreground"]docker-compose_tst.yml 如下。
# version: '2'
services:
ocw-dl:
container_name: ocw-dl-server
build: .
domainname: ocw.aca
hostname: ocw-dl-server
working_dir: /var/www/html
volumes:
- ../web:/var/www/html
- /ext_hd8t/ajax/wk_backup/ocw_bak/vod:/var/www/html/vod_dl
ports:
- 8380:80以上為 2024-01-23 更新，陽明山下雪之日。
| package main import ( "fmt" ) func main() { done := make(chan bool) values := []string{"a", "b", "c"} for _, v := range values { go func() { fmt.Println(v) done <- true }() } // wait for all goroutines to complete before exiting for _ = range values { <-done } } |
| values := []string{"a", "b", "c"} for _, v := range values { go func(u string) { fmt.Println(u) done <- true }(v) } |
| values := []string{"a", "b", "c"} for _, v := range values { v := v // create a new 'v'. go func() { fmt.Println(v) done <- true }() } |
header("X-Sendfile: $file_name");
header("Content-type: application/octet-stream");
header('Content-Disposition: attachment; filename="' . basename($file_name) . '"');$file_name is the full path on the file system.function Download($path, $speed = null, $multipart = true)
{
while (ob_get_level() > 0)
{
ob_end_clean();
}
if (is_file($path = realpath($path)) === true)
{
$file = @fopen($path, 'rb');
$size = sprintf('%u', filesize($path));
$speed = (empty($speed) === true) ? 1024 : floatval($speed);
if (is_resource($file) === true)
{
set_time_limit(0);
if (strlen(session_id()) > 0)
{
session_write_close();
}
if ($multipart === true)
{
$range = array(0, $size - 1);
if (array_key_exists('HTTP_RANGE', $_SERVER) === true)
{
$range = array_map('intval', explode('-', preg_replace('~.*=([^,]*).*~', '$1', $_SERVER['HTTP_RANGE'])));
if (empty($range[1]) === true)
{
$range[1] = $size - 1;
}
foreach ($range as $key => $value)
{
$range[$key] = max(0, min($value, $size - 1));
}
if (($range[0] > 0) || ($range[1] < ($size - 1)))
{
header(sprintf('%s %03u %s', 'HTTP/1.1', 206, 'Partial Content'), true, 206);
}
}
header('Accept-Ranges: bytes');
header('Content-Range: bytes ' . sprintf('%u-%u/%u', $range[0], $range[1], $size));
}
else
{
$range = array(0, $size - 1);
}
header('Pragma: public');
header('Cache-Control: public, no-cache');
header('Content-Type: application/octet-stream');
header('Content-Length: ' . sprintf('%u', $range[1] - $range[0] + 1));
header('Content-Disposition: attachment; filename="' . basename($path) . '"');
header('Content-Transfer-Encoding: binary');
if ($range[0] > 0)
{
fseek($file, $range[0]);
}
while ((feof($file) !== true) && (connection_status() === CONNECTION_NORMAL))
{
echo fread($file, round($speed * 1024)); flush(); sleep(1);
}
fclose($file);
}
exit();
}
else
{
header(sprintf('%s %03u %s', 'HTTP/1.1', 404, 'Not Found'), true, 404);
}
return false;
}$speedargument.serveStaticFile($fn, array(
'headers'=>array(
'Content-Type' => 'image/x-icon',
'Cache-Control' => 'public, max-age=604800',
'Expires' => gmdate("D, d M Y H:i:s", time() + 30 * 86400) . " GMT",
)
));
function serveStaticFile($path, $options = array()) {
$path = realpath($path);
if (is_file($path)) {
if(session_id())
session_write_close();
header_remove();
set_time_limit(0);
$size = filesize($path);
$lastModifiedTime = filemtime($path);
$fp = @fopen($path, 'rb');
$range = array(0, $size - 1);
header('Last-Modified: ' . gmdate("D, d M Y H:i:s", $lastModifiedTime)." GMT");
if (( ! empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $lastModifiedTime ) ) {
header("HTTP/1.1 304 Not Modified", true, 304);
return true;
}
if (isset($_SERVER['HTTP_RANGE'])) {
//$valid = preg_match('^bytes=\d*-\d*(,\d*-\d*)*$', $_SERVER['HTTP_RANGE']);
if(substr($_SERVER['HTTP_RANGE'], 0, 6) != 'bytes=') {
header('HTTP/1.1 416 Requested Range Not Satisfiable', true, 416);
header('Content-Range: bytes */' . $size); // Required in 416.
return false;
}
$ranges = explode(',', substr($_SERVER['HTTP_RANGE'], 6));
$range = explode('-', $ranges[0]); // to do: only support the first range now.
if ($range[0] === '') $range[0] = 0;
if ($range[1] === '') $range[1] = $size - 1;
if (($range[0] >= 0) && ($range[1] <= $size - 1) && ($range[0] <= $range[1])) {
header('HTTP/1.1 206 Partial Content', true, 206);
header('Content-Range: bytes ' . sprintf('%u-%u/%u', $range[0], $range[1], $size));
}
else {
header('HTTP/1.1 416 Requested Range Not Satisfiable', true, 416);
header('Content-Range: bytes */' . $size);
return false;
}
}
$contentLength = $range[1] - $range[0] + 1;
//header('Content-Disposition: attachment; filename="xxxxx"');
$headers = array(
'Accept-Ranges' => 'bytes',
'Content-Length' => $contentLength,
'Content-Type' => 'application/octet-stream',
);
if(!empty($options['headers'])) {
$headers = array_merge($headers, $options['headers']);
}
foreach($headers as $k=>$v) {
header("$k: $v", true);
}
if ($range[0] > 0) {
fseek($fp, $range[0]);
}
$sentSize = 0;
while (!feof($fp) && (connection_status() === CONNECTION_NORMAL)) {
$readingSize = $contentLength - $sentSize;
$readingSize = min($readingSize, 512 * 1024);
if($readingSize <= 0) break;
$data = fread($fp, $readingSize);
if(!$data) break;
$sentSize += strlen($data);
echo $data;
flush();
}
fclose($fp);
return true;
}
else {
header('HTTP/1.1 404 Not Found', true, 404);
return false;
}
}# 將會造成 resume download 的 header 拿掉
SetEnvIf Range .+ HAS_RANGE_HEADER
RequestHeader unset If-Range env=HAS_RANGE_HEADER
RequestHeader unset If-Match env=HAS_RANGE_HEADER
RequestHeader unset If-Unmodified-Since env=HAS_RANGE_HEADER