gotosocial/internal/router/router.go
kim 24516b84c2
[bugfix] handle HEAD requests more elegantly (#2055)
Signed-off-by: kim <grufwub@gmail.com>
2023-08-02 10:28:20 +02:00

244 lines
8.1 KiB
Go

// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package router
import (
"context"
"crypto/tls"
"fmt"
"net"
"net/http"
"time"
"codeberg.org/gruf/go-bytesize"
"codeberg.org/gruf/go-debug"
"github.com/gin-gonic/gin"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/log"
"golang.org/x/crypto/acme/autocert"
)
const (
readTimeout = 60 * time.Second
writeTimeout = 30 * time.Second
idleTimeout = 30 * time.Second
readHeaderTimeout = 30 * time.Second
shutdownTimeout = 30 * time.Second
maxMultipartMemory = int64(8 * bytesize.MiB)
)
// Router provides the REST interface for gotosocial, using gin.
type Router interface {
// Attach global gin middlewares to this router.
AttachGlobalMiddleware(handlers ...gin.HandlerFunc) gin.IRoutes
// AttachGroup attaches the given handlers into a group with the given relativePath as
// base path for that group. It then returns the *gin.RouterGroup so that the caller
// can add any extra middlewares etc specific to that group, as desired.
AttachGroup(relativePath string, handlers ...gin.HandlerFunc) *gin.RouterGroup
// Attach a single gin handler to the router with the given method and path.
// To make middleware management easier, AttachGroup should be preferred where possible.
// However, this function can be used for attaching single handlers that only require
// global middlewares.
AttachHandler(method string, path string, handler gin.HandlerFunc)
// Attach 404 NoRoute handler
AttachNoRouteHandler(handler gin.HandlerFunc)
// Start the router
Start()
// Stop the router
Stop(ctx context.Context) error
}
// router fulfils the Router interface using gin and logrus
type router struct {
engine *gin.Engine
srv *http.Server
certManager *autocert.Manager
}
// Start starts the router nicely. It will serve two handlers if letsencrypt is enabled, and only the web/API handler if letsencrypt is not enabled.
func (r *router) Start() {
// listen is the server start function, by
// default pointing to regular HTTP listener,
// but updated to TLS if LetsEncrypt is enabled.
listen := r.srv.ListenAndServe
// During config validation we already checked that both Chain and Key are set
// so we can forego checking for both here
if chain := config.GetTLSCertificateChain(); chain != "" {
pkey := config.GetTLSCertificateKey()
cer, err := tls.LoadX509KeyPair(chain, pkey)
if err != nil {
log.Fatalf(
nil,
"tls: failed to load keypair from %s and %s, ensure they are PEM-encoded and can be read by this process: %s",
chain, pkey, err,
)
}
r.srv.TLSConfig = &tls.Config{
MinVersion: tls.VersionTLS12,
Certificates: []tls.Certificate{cer},
}
// TLS is enabled, update the listen function
listen = func() error { return r.srv.ListenAndServeTLS("", "") }
}
if config.GetLetsEncryptEnabled() {
// LetsEncrypt support is enabled
// Prepare an HTTPS-redirect handler for LetsEncrypt fallback
redirect := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
target := "https://" + r.Host + r.URL.Path
if len(r.URL.RawQuery) > 0 {
target += "?" + r.URL.RawQuery
}
http.Redirect(rw, r, target, http.StatusTemporaryRedirect)
})
go func() {
// Take our own copy of HTTP server
// with updated autocert manager endpoint
srv := (*r.srv) //nolint
srv.Handler = r.certManager.HTTPHandler(redirect)
srv.Addr = fmt.Sprintf("%s:%d",
config.GetBindAddress(),
config.GetLetsEncryptPort(),
)
// Start the LetsEncrypt autocert manager HTTP server.
log.Infof(nil, "letsencrypt listening on %s", srv.Addr)
if err := srv.ListenAndServe(); err != nil &&
err != http.ErrServerClosed {
log.Fatalf(nil, "letsencrypt: listen: %s", err)
}
}()
// TLS is enabled, update the listen function
listen = func() error { return r.srv.ListenAndServeTLS("", "") }
}
// Pass the server handler through a debug pprof middleware handler.
// For standard production builds this will be a no-op, but when the
// "debug" or "debugenv" build-tag is set pprof stats will be served
// at the standard "/debug/pprof" URL.
r.srv.Handler = debug.WithPprof(r.srv.Handler)
if debug.DEBUG {
// Profiling requires timeouts longer than 30s, so reset these.
log.Warn(nil, "resetting http.Server{} timeout to support profiling")
r.srv.ReadTimeout = 0
r.srv.WriteTimeout = 0
}
// Start the main listener.
go func() {
log.Infof(nil, "listening on %s", r.srv.Addr)
if err := listen(); err != nil && err != http.ErrServerClosed {
log.Fatalf(nil, "listen: %s", err)
}
}()
}
// Stop shuts down the router nicely
func (r *router) Stop(ctx context.Context) error {
log.Infof(nil, "shutting down http router with %s grace period", shutdownTimeout)
timeout, cancel := context.WithTimeout(ctx, shutdownTimeout)
defer cancel()
if err := r.srv.Shutdown(timeout); err != nil {
return fmt.Errorf("error shutting down http router: %s", err)
}
log.Info(nil, "http router closed connections and shut down gracefully")
return nil
}
// New returns a new Router.
//
// The router's Attach functions should be used *before* the router is Started.
//
// When the router's work is finished, Stop should be called on it to close connections gracefully.
//
// The provided context will be used as the base context for all requests passing
// through the underlying http.Server, so this should be a long-running context.
func New(ctx context.Context) (Router, error) {
gin.SetMode(gin.TestMode)
// create the actual engine here -- this is the core request routing handler for gts
engine := gin.New()
engine.MaxMultipartMemory = maxMultipartMemory
engine.HandleMethodNotAllowed = true
// set up IP forwarding via x-forward-* headers.
trustedProxies := config.GetTrustedProxies()
if err := engine.SetTrustedProxies(trustedProxies); err != nil {
return nil, err
}
// set template functions
LoadTemplateFunctions(engine)
// load templates onto the engine
if err := LoadTemplates(engine); err != nil {
return nil, err
}
// use the passed-in command context as the base context for the server,
// since we'll never want the server to live past the command anyway
baseCtx := func(_ net.Listener) context.Context {
return ctx
}
bindAddress := config.GetBindAddress()
port := config.GetPort()
addr := fmt.Sprintf("%s:%d", bindAddress, port)
s := &http.Server{
Addr: addr,
Handler: engine, // use gin engine as handler
ReadTimeout: readTimeout,
ReadHeaderTimeout: readHeaderTimeout,
WriteTimeout: writeTimeout,
IdleTimeout: idleTimeout,
BaseContext: baseCtx,
}
// We need to spawn the underlying server slightly differently depending on whether lets encrypt is enabled or not.
// In either case, the gin engine will still be used for routing requests.
leEnabled := config.GetLetsEncryptEnabled()
var m *autocert.Manager
if leEnabled {
// le IS enabled, so roll up an autocert manager for handling letsencrypt requests
host := config.GetHost()
leCertDir := config.GetLetsEncryptCertDir()
leEmailAddress := config.GetLetsEncryptEmailAddress()
m = &autocert.Manager{
Prompt: autocert.AcceptTOS,
HostPolicy: autocert.HostWhitelist(host),
Cache: autocert.DirCache(leCertDir),
Email: leEmailAddress,
}
s.TLSConfig = m.TLSConfig()
}
return &router{
engine: engine,
srv: s,
certManager: m,
}, nil
}