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server.go
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server.go
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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"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"strings"
"time"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"github.com/pkg/errors"
"github.com/rs/cors"
"golang.org/x/crypto/acme/autocert"
"github.com/mattermost/mattermost-server/mlog"
"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
// RootRouter is the starting point for all HTTP requests to the server.
RootRouter *mux.Router
// Router is the starting point for all web, api4 and ws requests to the server. It differs
// from RootRouter only if the SiteURL contains a /subpath.
Router *mux.Router
Server *http.Server
ListenAddr *net.TCPAddr
RateLimiter *RateLimiter
didFinishListen chan struct{}
}
var corsAllowedMethods []string = []string{
"POST",
"GET",
"OPTIONS",
"PUT",
"PATCH",
"DELETE",
}
type RecoveryLogger struct {
}
func (rl *RecoveryLogger) Println(i ...interface{}) {
mlog.Error("Please check the std error output for the stack trace")
mlog.Error(fmt.Sprint(i...))
}
const TIME_TO_WAIT_FOR_CONNECTIONS_TO_CLOSE_ON_SERVER_SHUTDOWN = time.Second
// golang.org/x/crypto/acme/autocert/autocert.go
func handleHTTPRedirect(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" && r.Method != "HEAD" {
http.Error(w, "Use HTTPS", http.StatusBadRequest)
return
}
target := "https://" + stripPort(r.Host) + r.URL.RequestURI()
http.Redirect(w, r, target, http.StatusFound)
}
// golang.org/x/crypto/acme/autocert/autocert.go
func stripPort(hostport string) string {
host, _, err := net.SplitHostPort(hostport)
if err != nil {
return hostport
}
return net.JoinHostPort(host, "443")
}
func (a *App) StartServer() error {
mlog.Info("Starting Server...")
var handler http.Handler = a.Srv.RootRouter
if allowedOrigins := *a.Config().ServiceSettings.AllowCorsFrom; allowedOrigins != "" {
exposedCorsHeaders := *a.Config().ServiceSettings.CorsExposedHeaders
allowCredentials := *a.Config().ServiceSettings.CorsAllowCredentials
debug := *a.Config().ServiceSettings.CorsDebug
corsWrapper := cors.New(cors.Options{
AllowedOrigins: strings.Fields(allowedOrigins),
AllowedMethods: corsAllowedMethods,
AllowedHeaders: []string{"*"},
ExposedHeaders: strings.Fields(exposedCorsHeaders),
MaxAge: 86400,
AllowCredentials: allowCredentials,
Debug: debug,
})
// If we have debugging of CORS turned on then forward messages to logs
if debug {
corsWrapper.Log = a.Log.StdLog(mlog.String("source", "cors"))
}
handler = corsWrapper.Handler(handler)
}
if *a.Config().RateLimitSettings.Enable {
mlog.Info("RateLimiter is enabled")
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,
ErrorLog: a.Log.StdLog(mlog.String("source", "httpserver")),
}
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)
mlog.Info(fmt.Sprintf("Server is listening on %v", 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, port, err := net.SplitHostPort(addr); err != nil {
mlog.Error("Unable to setup forwarding: " + err.Error())
} else if port != "443" {
return fmt.Errorf(utils.T("api.server.start_server.forward80to443.enabled_but_listening_on_wrong_port"), port)
} else {
httpListenAddress := net.JoinHostPort(host, "http")
if *a.Config().ServiceSettings.UseLetsEncrypt {
server := &http.Server{
Addr: httpListenAddress,
Handler: m.HTTPHandler(nil),
ErrorLog: a.Log.StdLog(mlog.String("source", "le_forwarder_server")),
}
go server.ListenAndServe()
} else {
go func() {
redirectListener, err := net.Listen("tcp", httpListenAddress)
if err != nil {
mlog.Error("Unable to setup forwarding: " + err.Error())
return
}
defer redirectListener.Close()
server := &http.Server{
Handler: http.HandlerFunc(handleHTTPRedirect),
ErrorLog: a.Log.StdLog(mlog.String("source", "forwarder_server")),
}
server.Serve(redirectListener)
}()
}
}
} else if *a.Config().ServiceSettings.UseLetsEncrypt {
return errors.New(utils.T("api.server.start_server.forward80to443.disabled_while_using_lets_encrypt"))
}
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 {
mlog.Critical(fmt.Sprintf("Error starting server, err:%v", 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 {
mlog.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 != "" {
if allowed != "*" {
siteURL, err := url.Parse(*a.Config().ServiceSettings.SiteURL)
if err == nil {
siteURL.Path = ""
allowed += " " + siteURL.String()
}
}
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()
}
}