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/*
GoToSocial
Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
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/rand"
"fmt"
"net/http"
"os"
"path/filepath"
"time"
"github.com/gin-contrib/cors"
"github.com/gin-contrib/sessions"
"github.com/gin-contrib/sessions/memstore"
"github.com/gin-gonic/gin"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/config"
"golang.org/x/crypto/acme/autocert"
)
// Router provides the REST interface for gotosocial, using gin.
type Router interface {
// Attach a gin handler to the router with the given method and path
AttachHandler(method string, path string, f gin.HandlerFunc)
// Attach a gin middleware to the router that will be used globally
AttachMiddleware(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 {
logger *logrus.Logger
engine *gin.Engine
srv *http.Server
config *config.Config
certManager *autocert.Manager
}
// Start starts the router nicely.
//
// Different ports and handlers will be served depending on whether letsencrypt is enabled or not.
// If it is enabled, then port 80 will be used for handling LE requests, and port 443 will be used
// for serving actual requests.
//
// If letsencrypt is not being used, then port 8080 only will be used for serving requests.
func (r *router) Start() {
if r.config.LetsEncryptConfig.Enabled {
// serve the http handler on port 80 for receiving letsencrypt requests and solving their devious riddles
go func() {
if err := http.ListenAndServe(":http", r.certManager.HTTPHandler(http.HandlerFunc(httpsRedirect))); err != nil && err != http.ErrServerClosed {
r.logger.Fatalf("listen: %s", err)
}
}()
// and serve the actual TLS handler on port 443
go func() {
if err := r.srv.ListenAndServeTLS("", ""); err != nil && err != http.ErrServerClosed {
r.logger.Fatalf("listen: %s", err)
}
}()
} else {
// no tls required so just serve on port 8080
go func() {
if err := r.srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
r.logger.Fatalf("listen: %s", err)
}
}()
}
}
// Stop shuts down the router nicely
func (r *router) Stop(ctx context.Context) error {
return r.srv.Shutdown(ctx)
}
// AttachHandler attaches the given gin.HandlerFunc to the router with the specified method and path.
// If the path is set to ANY, then the handlerfunc will be used for ALL methods at its given path.
func (r *router) AttachHandler(method string, path string, handler gin.HandlerFunc) {
if method == "ANY" {
r.engine.Any(path, handler)
} else {
r.engine.Handle(method, path, handler)
}
}
// AttachMiddleware attaches a gin middleware to the router that will be used globally
func (r *router) AttachMiddleware(middleware gin.HandlerFunc) {
r.engine.Use(middleware)
}
// New returns a new Router with the specified configuration, using the given logrus logger.
func New(config *config.Config, logger *logrus.Logger) (Router, error) {
lvl, err := logrus.ParseLevel(config.LogLevel)
if err != nil {
return nil, fmt.Errorf("couldn't parse log level %s to set router level: %s", config.LogLevel, err)
}
switch lvl {
case logrus.TraceLevel, logrus.DebugLevel:
gin.SetMode(gin.DebugMode)
default:
gin.SetMode(gin.ReleaseMode)
}
// create the actual engine here -- this is the core request routing handler for gts
engine := gin.Default()
engine.Use(cors.New(cors.Config{
AllowAllOrigins: true,
AllowMethods: []string{"GET", "POST", "PUT", "PATCH", "DELETE"},
AllowHeaders: []string{"Origin", "Content-Length", "Content-Type", "Authorization"},
AllowCredentials: false,
MaxAge: 12 * time.Hour,
}))
engine.MaxMultipartMemory = 8 << 20 // 8 MiB
// create a new session store middleware
store, err := sessionStore()
if err != nil {
return nil, fmt.Errorf("error creating session store: %s", err)
}
engine.Use(sessions.Sessions("gotosocial-session", store))
// load html templates for use by the router
cwd, err := os.Getwd()
if err != nil {
return nil, fmt.Errorf("error getting current working directory: %s", err)
}
tmPath := filepath.Join(cwd, fmt.Sprintf("%s*", config.TemplateConfig.BaseDir))
logger.Debugf("loading templates from %s", tmPath)
engine.LoadHTMLGlob(tmPath)
// create the actual http server here
s := &http.Server{
Handler: engine,
ReadTimeout: 60 * time.Second,
WriteTimeout: 5 * time.Second,
IdleTimeout: 30 * time.Second,
ReadHeaderTimeout: 30 * time.Second,
}
var m *autocert.Manager
// 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.
if config.LetsEncryptConfig.Enabled {
// le IS enabled, so roll up an autocert manager for handling letsencrypt requests
m = &autocert.Manager{
Prompt: autocert.AcceptTOS,
HostPolicy: autocert.HostWhitelist(config.Host),
Cache: autocert.DirCache(config.LetsEncryptConfig.CertDir),
Email: config.LetsEncryptConfig.EmailAddress,
}
// and create an HTTPS server
s.Addr = ":https"
s.TLSConfig = m.TLSConfig()
} else {
// le is NOT enabled, so just serve bare requests on port 8080
s.Addr = ":8080"
}
return &router{
logger: logger,
engine: engine,
srv: s,
config: config,
certManager: m,
}, nil
}
// sessionStore returns a new session store with a random auth and encryption key.
// This means that cookies using the store will be reset if gotosocial is restarted!
func sessionStore() (memstore.Store, error) {
auth := make([]byte, 32)
crypt := make([]byte, 32)
if _, err := rand.Read(auth); err != nil {
return nil, err
}
if _, err := rand.Read(crypt); err != nil {
return nil, err
}
return memstore.NewStore(auth, crypt), nil
}
func httpsRedirect(w http.ResponseWriter, req *http.Request) {
target := "https://" + req.Host + req.URL.Path
if len(req.URL.RawQuery) > 0 {
target += "?" + req.URL.RawQuery
}
http.Redirect(w, req, target, http.StatusTemporaryRedirect)
}
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