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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package app
import (
"context"
"crypto/tls"
"io"
"io/ioutil"
"net"
"net/http"
"os"
"strings"
"time"
l4g "github.com/alecthomas/log4go"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"github.com/pkg/errors"
"golang.org/x/crypto/acme/autocert"
"github.com/mattermost/mattermost-server/model"
"github.com/mattermost/mattermost-server/store"
"github.com/mattermost/mattermost-server/utils"
)
type Server struct {
Store store.Store
WebSocketRouter *WebSocketRouter
Router *mux.Router
Server *http.Server
ListenAddr *net.TCPAddr
RateLimiter *RateLimiter
didFinishListen chan struct{}
}
var allowedMethods []string = []string{
"POST",
"GET",
"OPTIONS",
"PUT",
"PATCH",
"DELETE",
}
type RecoveryLogger struct {
}
func (rl *RecoveryLogger) Println(i ...interface{}) {
l4g.Error("Please check the std error output for the stack trace")
l4g.Error(i)
}
type CorsWrapper struct {
config model.ConfigFunc
router *mux.Router
}
func (cw *CorsWrapper) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if allowed := *cw.config().ServiceSettings.AllowCorsFrom; allowed != "" {
if utils.CheckOrigin(r, allowed) {
w.Header().Set("Access-Control-Allow-Origin", r.Header.Get("Origin"))
if r.Method == "OPTIONS" {
w.Header().Set(
"Access-Control-Allow-Methods",
strings.Join(allowedMethods, ", "))
w.Header().Set(
"Access-Control-Allow-Headers",
r.Header.Get("Access-Control-Request-Headers"))
}
}
}
if r.Method == "OPTIONS" {
return
}
cw.router.ServeHTTP(w, r)
}
const TIME_TO_WAIT_FOR_CONNECTIONS_TO_CLOSE_ON_SERVER_SHUTDOWN = time.Second
func redirectHTTPToHTTPS(w http.ResponseWriter, r *http.Request) {
if r.Host == "" {
http.Error(w, "Not Found", http.StatusNotFound)
}
url := r.URL
url.Host = r.Host
url.Scheme = "https"
http.Redirect(w, r, url.String(), http.StatusFound)
}
func (a *App) StartServer() error {
l4g.Info(utils.T("api.server.start_server.starting.info"))
var handler http.Handler = &CorsWrapper{a.Config, a.Srv.Router}
if *a.Config().RateLimitSettings.Enable {
l4g.Info(utils.T("api.server.start_server.rate.info"))
rateLimiter, err := NewRateLimiter(&a.Config().RateLimitSettings)
if err != nil {
return err
}
a.Srv.RateLimiter = rateLimiter
handler = rateLimiter.RateLimitHandler(handler)
}
a.Srv.Server = &http.Server{
Handler: handlers.RecoveryHandler(handlers.RecoveryLogger(&RecoveryLogger{}), handlers.PrintRecoveryStack(true))(handler),
ReadTimeout: time.Duration(*a.Config().ServiceSettings.ReadTimeout) * time.Second,
WriteTimeout: time.Duration(*a.Config().ServiceSettings.WriteTimeout) * time.Second,
}
addr := *a.Config().ServiceSettings.ListenAddress
if addr == "" {
if *a.Config().ServiceSettings.ConnectionSecurity == model.CONN_SECURITY_TLS {
addr = ":https"
} else {
addr = ":http"
}
}
listener, err := net.Listen("tcp", addr)
if err != nil {
errors.Wrapf(err, utils.T("api.server.start_server.starting.critical"), err)
return err
}
a.Srv.ListenAddr = listener.Addr().(*net.TCPAddr)
l4g.Info(utils.T("api.server.start_server.listening.info"), listener.Addr().String())
// Migration from old let's encrypt library
if *a.Config().ServiceSettings.UseLetsEncrypt {
if stat, err := os.Stat(*a.Config().ServiceSettings.LetsEncryptCertificateCacheFile); err == nil && !stat.IsDir() {
os.Remove(*a.Config().ServiceSettings.LetsEncryptCertificateCacheFile)
}
}
m := &autocert.Manager{
Cache: autocert.DirCache(*a.Config().ServiceSettings.LetsEncryptCertificateCacheFile),
Prompt: autocert.AcceptTOS,
}
if *a.Config().ServiceSettings.Forward80To443 {
if host, _, err := net.SplitHostPort(addr); err != nil {
l4g.Error("Unable to setup forwarding: " + err.Error())
} else {
httpListenAddress := net.JoinHostPort(host, "http")
if *a.Config().ServiceSettings.UseLetsEncrypt {
go http.ListenAndServe(httpListenAddress, m.HTTPHandler(nil))
} else {
go func() {
redirectListener, err := net.Listen("tcp", httpListenAddress)
if err != nil {
l4g.Error("Unable to setup forwarding: " + err.Error())
return
}
defer redirectListener.Close()
http.Serve(redirectListener, http.HandlerFunc(redirectHTTPToHTTPS))
}()
}
}
}
a.Srv.didFinishListen = make(chan struct{})
go func() {
var err error
if *a.Config().ServiceSettings.ConnectionSecurity == model.CONN_SECURITY_TLS {
if *a.Config().ServiceSettings.UseLetsEncrypt {
tlsConfig := &tls.Config{
GetCertificate: m.GetCertificate,
}
tlsConfig.NextProtos = append(tlsConfig.NextProtos, "h2")
a.Srv.Server.TLSConfig = tlsConfig
err = a.Srv.Server.ServeTLS(listener, "", "")
} else {
err = a.Srv.Server.ServeTLS(listener, *a.Config().ServiceSettings.TLSCertFile, *a.Config().ServiceSettings.TLSKeyFile)
}
} else {
err = a.Srv.Server.Serve(listener)
}
if err != nil && err != http.ErrServerClosed {
l4g.Critical(utils.T("api.server.start_server.starting.critical"), err)
time.Sleep(time.Second)
}
close(a.Srv.didFinishListen)
}()
return nil
}
func (a *App) StopServer() {
if a.Srv.Server != nil {
ctx, cancel := context.WithTimeout(context.Background(), TIME_TO_WAIT_FOR_CONNECTIONS_TO_CLOSE_ON_SERVER_SHUTDOWN)
defer cancel()
didShutdown := false
for a.Srv.didFinishListen != nil && !didShutdown {
if err := a.Srv.Server.Shutdown(ctx); err != nil {
l4g.Warn(err.Error())
}
timer := time.NewTimer(time.Millisecond * 50)
select {
case <-a.Srv.didFinishListen:
didShutdown = true
case <-timer.C:
}
timer.Stop()
}
a.Srv.Server.Close()
a.Srv.Server = nil
}
}
func (a *App) OriginChecker() func(*http.Request) bool {
if allowed := *a.Config().ServiceSettings.AllowCorsFrom; allowed != "" {
return utils.OriginChecker(allowed)
}
return nil
}
// This is required to re-use the underlying connection and not take up file descriptors
func consumeAndClose(r *http.Response) {
if r.Body != nil {
io.Copy(ioutil.Discard, r.Body)
r.Body.Close()
}
}
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