/
auth.go
155 lines (140 loc) · 4.2 KB
/
auth.go
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package gae_authen
import (
"fmt"
"strings"
"time"
jwt "github.com/dgrijalva/jwt-go"
"golang.org/x/crypto/bcrypt"
"appengine"
"appengine/datastore"
)
const AUTHEN = "_authen"
type User struct {
Userid string
Username string
SaltedHash []byte
IsPasswordChanged bool
Peep []byte
}
type Authen struct {
c appengine.Context
privateKey []byte
}
func NewAuthen(context appengine.Context, key []byte) *Authen {
return &Authen{context, key}
}
func (authen *Authen) GetCurrentUserId(jwtCookie string) (string, error) {
tok, err := authen.ParseToken(jwtCookie)
if err != nil {
return "", err
}
userId := tok.Claims["userid"].(string)
return userId, nil
}
func (authen *Authen) CreateUser(userid string, username string, password []byte) (string, error) {
userid = strings.ToLower(userid)
hashedPassword, err := bcrypt.GenerateFromPassword(password, 10)
if err != nil {
return "", err
}
authenKey := datastore.NewKey(authen.c, AUTHEN, userid, 0, nil)
user := &User{userid, username, hashedPassword, false, password}
key, err := datastore.Put(authen.c, authenKey, user)
return key.StringID(), err
}
func (authen *Authen) DeleteUsers(userids []string) error {
var keys []*datastore.Key = make([]*datastore.Key, len(userids))
for i, id := range userids {
id = strings.ToLower(id)
keys[i] = datastore.NewKey(authen.c, AUTHEN, id, 0, nil)
}
return datastore.DeleteMulti(authen.c, keys)
}
func (authen *Authen) ContainsUser(userid string) bool {
key := datastore.NewKey(authen.c, AUTHEN, userid, 0, nil)
var u User
if err := datastore.Get(authen.c, key, &u); err != nil {
return false
}
return true
}
func (authen *Authen) UpdateUser(userid string, username string) bool {
key := datastore.NewKey(authen.c, AUTHEN, userid, 0, nil)
var u User
err := datastore.Get(authen.c, key, &u)
if err != nil {
return false
}
u.Username = username
if _, err = datastore.Put(authen.c, key, &u); err != nil {
return false
}
return true
}
func (authen *Authen) ChangePassword(userid string, newPw []byte) bool {
key := datastore.NewKey(authen.c, AUTHEN, userid, 0, nil)
var u User
err := datastore.Get(authen.c, key, &u)
if err != nil {
return false
}
u.IsPasswordChanged = true
u.Peep = []byte("")
hashedPassword, err := bcrypt.GenerateFromPassword(newPw, 10)
if err != nil {
return false
}
u.SaltedHash = hashedPassword
if _, err = datastore.Put(authen.c, key, &u); err != nil {
return false
}
return true
}
func (authen *Authen) Login(userid string, password []byte, duration int) (string, error) {
userid = strings.ToLower(userid)
authenKey := datastore.NewKey(authen.c, AUTHEN, userid, 0, nil)
var u User
err := datastore.Get(authen.c, authenKey, &u)
if err != nil {
return "", new(UserNotFound)
}
err = bcrypt.CompareHashAndPassword(u.SaltedHash, password)
if err != nil {
return "", new(WrongPasswordError)
}
return authen.getJwtForUser(u.Userid, u.Username, duration, !u.IsPasswordChanged)
}
func (authen *Authen) getJwtForUser(userid string, username string, duration int, changePassword bool) (string, error) {
userid = strings.ToLower(userid)
token := jwt.New(jwt.SigningMethodHS512)
token.Claims["userid"] = userid
token.Claims["username"] = username
token.Claims["cp"] = changePassword
token.Claims["exp"] = time.Now().Add(time.Second * time.Duration(duration)).Unix()
return token.SignedString(authen.privateKey)
}
func (authen *Authen) ParseToken(tokenString string) (*jwt.Token, error) {
myToken, err := jwt.Parse(tokenString, func(tokenWithin *jwt.Token) (interface{}, error) {
if _, ok := tokenWithin.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", tokenWithin.Header["alg"])
}
if tokenWithin.Method.Alg() != "HS512" {
return nil, fmt.Errorf("Unexpected signing method string: %v", tokenWithin.Header["alg"])
}
exp, ok := tokenWithin.Claims["exp"].(float64)
if !ok {
return nil, fmt.Errorf("Token does not contain expiry claim")
}
if exp < float64(time.Now().Unix()) {
return nil, fmt.Errorf("Token expired")
}
return authen.privateKey, nil
})
if err != nil {
return nil, err
}
if !myToken.Valid {
return nil, fmt.Errorf("Token is invalid")
}
return myToken, err
}