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login.go
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login.go
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package handlers
import (
"encoding/json"
"net/http"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/kelseyhightower/app/user"
"golang.org/x/crypto/bcrypt"
)
type LoginResponse struct {
Token string `json:"token"`
}
type loginHandler struct {
secret string
users user.Users
}
func (h *loginHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
username, password, ok := r.BasicAuth()
if !ok {
http.Error(w, "authorization failed", http.StatusUnauthorized)
return
}
user, ok := h.users[username]
if !ok {
http.Error(w, "authorization failed", http.StatusUnauthorized)
return
}
err := bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(password))
if err != nil {
http.Error(w, "authorization failed", http.StatusUnauthorized)
return
}
token := jwt.New(jwt.SigningMethodHS256)
token.Claims["exp"] = time.Now().Add(time.Hour * 72).Unix()
token.Claims["iss"] = "auth.service"
token.Claims["iat"] = time.Now().Unix()
token.Claims["email"] = user.Email
token.Claims["sub"] = user.Username
tokenString, err := token.SignedString([]byte(h.secret))
if err != nil {
http.Error(w, "authorization failed", http.StatusUnauthorized)
return
}
response := LoginResponse{
Token: tokenString,
}
json.NewEncoder(w).Encode(response)
}
func LoginHandler(secret string, users user.Users) http.Handler {
return &loginHandler{
secret: secret,
users: users,
}
}