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server.go
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server.go
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package userregistration
import (
"crypto/rand"
"crypto/tls"
"fmt"
"log"
"net"
"net/http"
"strings"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/gorilla/mux"
"github.com/pavank830/user-registration/user"
"github.com/pavank830/user-registration/utils"
)
func init() {
tr := &http.Transport{
DisableCompression: true,
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).DialContext,
MaxIdleConnsPerHost: 3,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
TLSClientConfig: configTLS(""),
}
httpClient = &http.Client{
Transport: tr,
Timeout: 30 * time.Second,
}
}
//Start -- func that starts http server
func Start(port string, dsn string) error {
user.DSN = dsn
return startHTTPSvr(port)
}
func configTLS(serverName string) *tls.Config {
TLSConfig := &tls.Config{
ServerName: serverName,
Certificates: []tls.Certificate{{}},
Rand: rand.Reader,
SessionTicketsDisabled: false,
MinVersion: tls.VersionTLS12,
InsecureSkipVerify: true,
}
return TLSConfig
}
func getRouter() *mux.Router {
// gorilla/mux for routing
router := mux.NewRouter()
router.Use(starterMiddleware)
router.HandleFunc(user.SignUpPath, user.SignUp).Methods(http.MethodPost)
router.HandleFunc(user.LoginPath, user.Login).Methods(http.MethodPost)
router.HandleFunc(user.LogoutPath, user.Logout).Methods(http.MethodPost)
router.HandleFunc(user.ProfilePath, user.GetProfile).Methods(http.MethodGet)
router.HandleFunc(user.UpdateNamePath, user.UpdateUserName).Methods(http.MethodPut)
router.HandleFunc(user.DeleteUserPath, user.DeleteUser).Methods(http.MethodDelete)
router.NotFoundHandler = http.HandlerFunc(defaultHandler)
return router
}
func starterMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
start := time.Now()
resp.Header().Set("Access-Control-Allow-Origin", "*")
resp.Header().Set("Access-Control-Allow-Credentials", "true")
if _, ok := NoAuth[req.RequestURI]; !ok {
log.Println("jwt token verification")
authHeader := strings.Split(req.Header.Get("Authorization"), "Bearer ")
id, code, errmsg := ValidateJWTToken(authHeader)
if errmsg != "" || code != 0 {
resp.WriteHeader(code)
resp.Write([]byte(errmsg))
return
}
req.Header.Set(utils.HeaderUserID, id)
if len(authHeader) > 0 {
req.Header.Set(utils.HeaderJWT, authHeader[1])
}
}
next.ServeHTTP(resp, req)
log.Printf("Duration: %s %s %s\n", req.Method, req.RequestURI, time.Since(start).String())
})
}
func startHTTPSvr(port string) error {
server := &http.Server{
Addr: listenAddr + ":" + port,
Handler: getRouter(),
ReadTimeout: time.Duration(HTTPReadTimeout) * time.Second,
WriteTimeout: time.Duration(HTTPWriteTimeout) * time.Second,
}
log.Printf("## HTTP Server listening on %v\n", server.Addr)
if err := server.ListenAndServe(); err != nil {
log.Printf("Failed to start http server %+v\n", err)
return err
}
return nil
}
func defaultHandler(w http.ResponseWriter, r *http.Request) {
log.Printf("defaultHandler Duration: %s %s ", r.Method, r.RequestURI)
}
// ValidateJWTToken -- validate jwt token
func ValidateJWTToken(authHeader []string) (string, int, string) {
var code int
var errmsg string
var id string
if len(authHeader) != 2 {
log.Println("invalid token.")
code = http.StatusUnauthorized
errmsg = utils.ErrInvalidToken.Error()
return id, code, errmsg
}
jwtToken := authHeader[1]
token, err := jwt.Parse(jwtToken, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return []byte(utils.JWTSecretKey), nil
})
if err != nil {
if ve, ok := err.(*jwt.ValidationError); ok {
if ve.Errors == jwt.ValidationErrorExpired {
log.Println("token expired")
code = http.StatusUnauthorized
errmsg = utils.ErrExpiredToken.Error()
return id, code, errmsg
}
}
log.Println("token invalid,unauthorized")
code = http.StatusUnauthorized
errmsg = utils.ErrInvalidToken.Error()
return id, code, errmsg
}
claim, ok := token.Claims.(jwt.MapClaims)
if !ok || !token.Valid {
log.Println("token invalid,claims empty")
code = http.StatusUnauthorized
errmsg = utils.ErrInvalidToken.Error()
return id, code, errmsg
}
// check if token blacklisted
if user.CheckInBlackList(authHeader[1]) {
code = http.StatusUnauthorized
errmsg = utils.ErrInvalidToken.Error()
return id, code, errmsg
}
switch idt := claim["id"].(type) {
case string:
id = idt
default:
log.Println("token invalid,format")
code = http.StatusUnauthorized
errmsg = utils.ErrInvalidToken.Error()
return id, code, errmsg
}
return id, code, errmsg
}