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server.go
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server.go
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package api
import (
"context"
"crypto/tls"
"fmt"
"github.com/dp1140a/geoip/api/geo"
"github.com/dp1140a/geoip/api/httplogging"
"github.com/dp1140a/geoip/models"
"net/http"
"github.com/go-chi/jwtauth"
log "github.com/sirupsen/logrus"
"github.com/go-chi/chi"
"github.com/go-chi/chi/middleware"
"github.com/go-chi/cors"
)
var tokenAuth *jwtauth.JWTAuth
type Server struct {
Config *ServerConfig
Logger *log.Logger
Context context.Context
Router *chi.Mux
Handlers []models.HandlerIFace
}
func init() {
// For debugging/example purposes, we generate and print
// a sample jwt token with claims `user_id:123` here:
}
func NewServer(ctx context.Context) (s *Server, err error) {
config, err := InitServerConfig()
s = &Server{
Config: config,
Logger: log.New(),
Context: ctx,
Router: chi.NewRouter(),
}
tokenAuth = jwtauth.New("HS256", []byte(config.JWTSecret), nil)
s.Logger.Formatter = &log.JSONFormatter{
// disable, as we set our own
DisableTimestamp: false,
}
//Add and init middleware
s.Router.Use(middleware.Recoverer)
s.Router.Use(middleware.RedirectSlashes)
s.Router.Use(middleware.RequestID)
s.Router.Use(middleware.Compress(5, "gzip"))
log.Info("Request Logger Enabled: ", config.LoggingConfig.Enabled)
if config.LoggingConfig.Enabled == true {
s.Router.Use(httplogging.NewStructuredLogger(s.Logger, s.Config.LoggingConfig))
}
//s.Router.Use(middleware.Logger)
if config.EnableCORS {
s.Router.Use(corsConfig().Handler)
}
//Append Services
s.Handlers = append(s.Handlers, geo.NewGeoHandler(s.Context, tokenAuth)) // Geo Service
//Append the base services Last
s.Handlers = append(s.Handlers, NewBaseHandler(s.Logger, s.Router))
s.Router.Mount("/v1", s.registerRoutes())
return s, err
}
func (s *Server) registerRoutes() chi.Router {
r := chi.NewRouter()
for _, handler := range s.Handlers {
log.Info("Opening Route Prefix ", handler.GetPrefix())
r.Route(handler.GetPrefix(), func(r chi.Router) {
for _, route := range handler.GetRoutes() {
log.Info("Adding route ", route.Name)
if route.Protected { //Protected Route
r.Group(func(r chi.Router) {
// Seek, verify and validate JWT tokens
r.Use(jwtauth.Verifier(tokenAuth))
r.Use(MyAuthenticator)
r.Method(route.Method, route.Pattern, route.HandlerFunc)
})
} else { // Public Route
r.Method(route.Method, route.Pattern, route.HandlerFunc)
}
}
})
}
return r
}
func (s *Server) ServeAPI() {
srv := &http.Server{
Addr: fmt.Sprintf("%s:%v", s.Config.Hostname, s.Config.Port),
Handler: s.Router,
}
done := make(chan struct{})
go func() {
<-s.Context.Done()
if err := srv.Shutdown(s.Context); err != nil {
log.Fatal(err)
}
close(done)
}()
var cer tls.Certificate
transport := "http"
if s.Config.UseHttps && (s.Config.TLSCert != "" && s.Config.TLSKey != "") {
var err error
cer, err = tls.LoadX509KeyPair(s.Config.TLSCert, s.Config.TLSKey)
if err != nil {
log.Error("failed to load x509 key pair", err)
log.Info("Stopping")
}
transport = "https"
// Sensible default
var tlsMinVersion uint16 = tls.VersionTLS12
switch s.Config.TLSMinVersion {
case "1.0":
log.Warn("Setting the minimum version of TLS to 1.0 - this is discouraged. Please use 1.2 or 1.3")
tlsMinVersion = tls.VersionTLS10
case "1.1":
log.Warn("Setting the minimum version of TLS to 1.1 - this is discouraged. Please use 1.2 or 1.3")
tlsMinVersion = tls.VersionTLS11
case "1.2":
tlsMinVersion = tls.VersionTLS12
case "1.3":
tlsMinVersion = tls.VersionTLS13
}
strictCiphers := []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_RSA_WITH_AES_256_CBC_SHA,
}
// nil uses the default cipher suite
var cipherConfig []uint16 = nil
// TLS 1.3 does not support configuring the Cipher suites
if tlsMinVersion != tls.VersionTLS13 && s.Config.HttpTLSStrictCiphers {
cipherConfig = strictCiphers
}
srv.TLSConfig = &tls.Config{
CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256},
PreferServerCipherSuites: true,
MinVersion: tlsMinVersion,
CipherSuites: cipherConfig,
}
}
log.Infof("Listening %s on %s:%v", transport, s.Config.Hostname, s.Config.Port)
if cer.Certificate != nil {
if err := srv.ListenAndServeTLS(s.Config.TLSCert, s.Config.TLSKey); err != http.ErrServerClosed {
log.Error(err)
}
} else {
if err := srv.ListenAndServe(); err != http.ErrServerClosed {
log.Error(err)
}
}
<-done
}
func MyAuthenticator(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
token, _, err := jwtauth.FromContext(r.Context())
if err != nil {
log.Error("Token Error: ", err)
http.Error(w, http.StatusText(401), 401)
return
}
if token == nil || !token.Valid {
log.Error("Token Invalid")
http.Error(w, http.StatusText(401), 401)
return
}
// Token is authenticated, pass it through
next.ServeHTTP(w, r)
})
}
func corsConfig() *cors.Cors {
// Basic CORS
// for more ideas, see: https://developer.github.com/v3/#cross-origin-resource-sharing
return cors.New(cors.Options{
// AllowedOrigins: []string{"https://foo.com"}, // Use this to allow specific origin hosts
AllowedOrigins: []string{"*"},
// AllowOriginFunc: func(r *http.Request, origin string) bool { return true },
AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
ExposedHeaders: []string{"Link"},
AllowCredentials: true,
MaxAge: 86400, // Maximum value not ignored by any of major browsers
})
}