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// SPDX-FileCopyrightText: © 2020 Grégoire Duchêne <gduchene@awhk.org>
// SPDX-License-Identifier: ISC
package main
import (
"context"
"flag"
"log"
"net"
"net/http"
"os"
"os/signal"
"time"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"golang.org/x/sys/unix"
"go.awhk.org/fwdsms/pkg/twilio"
"go.awhk.org/gosdd"
)
var cfgFilename = flag.String("c", "/etc/fwdsms.yaml", "configuration file")
func main() {
flag.Parse()
log.SetFlags(0)
fd, err := os.Open(*cfgFilename)
if err != nil {
log.Fatalf("Could not open the configuration file: %v.", err)
}
cfg, err := loadConfig(fd)
if err != nil {
log.Fatalf("Could not load the configuration: %v.", err)
}
if err := fd.Close(); err != nil {
log.Printf("Failed to close configuration file: %v.", err)
}
done := make(chan os.Signal, 1)
signal.Notify(done, os.Interrupt, unix.SIGTERM)
sms := make(chan twilio.SMS)
r := mux.NewRouter()
r.Path(cfg.Twilio.Endpoint).
Methods(http.MethodPost).
Handler(handlers.ProxyHeaders(&twilio.Filter{
AuthToken: []byte(cfg.Twilio.AuthToken),
Handler: &twilio.SMSTee{
Chan: sms,
Handler: twilio.EmptyResponseHandler,
},
}))
srv := http.Server{Handler: r}
go func() {
ln, err := listenSD()
if err != nil {
log.Fatalf("Failed to listen on systemd socket: %s.", err)
}
if ln == nil {
ln = listenEnv(cfg)
}
if err = srv.Serve(ln); err != nil && err != http.ErrServerClosed {
log.Fatalf("Failed to serve HTTP: %s.", err)
}
}()
mailer := newMailer(cfg, sms)
ctx, cancel := context.WithCancel(context.Background())
go mailer.start(ctx)
<-done
cancel()
ctx, cancel = context.WithTimeout(context.Background(), time.Second)
defer cancel()
if err := srv.Shutdown(ctx); err != nil && err != http.ErrServerClosed {
log.Fatalf("Failed to properly shut down the HTTP server: %v.", err)
}
}
func listenEnv(cfg *Config) net.Listener {
if cfg.Twilio.Address != "" && cfg.Twilio.Address[0] == '/' {
ln, err := net.Listen("unix", cfg.Twilio.Address)
if err != nil {
log.Fatalf("Could not set up UNIX listener: %s.", err)
}
if err := os.Chmod(cfg.Twilio.Address, 0666); err != nil {
log.Fatalf("Could not set up permissions on UNIX socket: %s.", err)
}
return ln
}
ln, err := net.Listen("tcp", cfg.Twilio.Address)
if err != nil {
log.Fatalf("Could not set up TCP listener: %s.", err)
}
return ln
}
func listenSD() (net.Listener, error) {
fds, err := gosdd.SDListenFDs(true)
if err != nil {
if err == gosdd.ErrNoSDSupport {
return nil, nil
}
return nil, err
}
if len(fds) == 0 {
return nil, nil
}
return net.FileListener(fds[0])
}
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