/
server.go
152 lines (140 loc) · 3.44 KB
/
server.go
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package server
import (
"crypto/md5"
"encoding/hex"
"fmt"
"log/slog"
"net"
"net/http"
"os"
"time"
"github.com/jpillora/ipfilter"
"github.com/jpillora/requestlog"
"github.com/jpillora/uploader/internal/handler"
"golang.org/x/sync/errgroup"
)
type Config struct {
Dir string `help:"output directory (defaults to tmp)"`
Overwrite bool `help:"duplicates are overwritten (auto-renames files by default)"`
Auth string `help:"require basic auth 'username:password' on http connections"`
Port int `help:"tcp listening port"`
UDPPort int `help:"udp listening port (default disabled)"`
UDPClose time.Duration `help:"close udp file after timeout"`
NoLog bool `help:"disable http request logging"`
AllowedIP []string `opts:"short=i, help=allowed ip range"`
Verbose bool `help:"enable verbose logging"`
}
type Server struct {
Config
filter *ipfilter.IPFilter
log *slog.Logger
}
func New(c Config) *Server {
if c.Dir == "" {
c.Dir = os.TempDir()
}
log := slog.New(&shandler{
verbose: c.Verbose,
}).WithGroup("uploader")
return &Server{
Config: c,
filter: nil,
log: log,
}
}
func (s *Server) Start() error {
if len(s.AllowedIP) > 0 {
s.log.Info("enable filter", "allowed-ips", s.AllowedIP)
s.filter = ipfilter.New(ipfilter.Options{
AllowedIPs: s.AllowedIP,
BlockByDefault: true,
})
}
if info, err := os.Stat(s.Dir); err != nil || !info.IsDir() {
return fmt.Errorf("invalid directory: %s", s.Dir)
}
s.log.Info("output directory", "path", s.Dir)
eg := errgroup.Group{}
if s.UDPPort != 0 {
eg.Go(s.startUDP)
}
eg.Go(s.startHTTP)
return eg.Wait()
}
func (s *Server) startHTTP() error {
log := s.log.WithGroup("http")
// for compatibility with the old version, we keep the handler config separate
h, err := handler.New(handler.Config{
Dir: s.Dir,
Overwrite: s.Overwrite,
Auth: s.Auth,
Logger: log,
})
if err != nil {
return err
}
if s.filter != nil {
h = s.filter.Wrap(h)
}
if !s.NoLog {
// TODO: add slog support to requestlog
h = requestlog.Wrap(h)
}
addr := fmt.Sprintf("0.0.0.0:%d", s.Port)
l, err := net.Listen("tcp", addr)
if err != nil {
return err
}
log.Info("listening on tcp", "addr", addr)
return http.Serve(l, h)
}
func (s *Server) startUDP() error {
log := s.log.WithGroup("udp")
addr := fmt.Sprintf("0.0.0.0:%d", s.UDPPort)
uaddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return err
}
conn, err := net.ListenUDP("udp", uaddr)
if err != nil {
return fmt.Errorf("udp: %w", err)
}
log.Info("listening on udp", "addr", addr)
// track udp files
files := &udpFiles{
log: log,
config: s.Config,
}
// read all udp packets
// TODO: writer-pool for each file to allow concurrent writes
buff := make([]byte, 32*1024)
for {
n, addr, err := conn.ReadFromUDP(buff)
if err != nil {
log.Warn("read", "err", err)
continue
}
// ip check
if s.filter != nil && !s.filter.NetAllowed(addr.IP) {
log.Debug("blocked", "addr", addr)
continue
}
// prepare id
hash := md5.Sum([]byte(addr.String()))
id := hex.EncodeToString(hash[:])[0:8]
// prepare file
f, err := files.upsert(id)
if err != nil {
log.Warn("get-err", "id", id, "err", err)
continue
}
// write to file
b := buff[:n]
if _, err := f.write(b); err != nil {
log.Warn("write-err", "id", id, "err", err)
files.del(id)
}
// sweep all files soon
files.enqueueSweep()
}
}