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auth.go
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auth.go
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package user
import (
"crypto/rsa"
"time"
jwt "github.com/dgrijalva/jwt-go"
pb "github.com/leandro-lugaresi/grpc-realtime-chat/server/user/userpb"
"github.com/pkg/errors"
"github.com/satori/go.uuid"
"golang.org/x/crypto/bcrypt"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
type AuthServer struct {
JwtPrivateKey *rsa.PrivateKey
UserManager UserManager
}
func NewAuthServer(rsaPrivateKey []byte, s UserManager) (*AuthServer, error) {
pk, err := jwt.ParseRSAPrivateKeyFromPEM(rsaPrivateKey)
if err != nil {
return nil, errors.Wrap(err, "Error parsing the jwt private key")
}
return &AuthServer{pk, s}, nil
}
func (as *AuthServer) SignUp(cx context.Context, r *pb.SignUpRequest) (*pb.Token, error) {
pass, err := bcrypt.GenerateFromPassword([]byte(r.Password), bcrypt.DefaultCost)
if err != nil {
return nil, errors.Wrapf(err, "Failed to encrypt the Password")
}
t := time.Now().Unix()
user := &User{
User: pb.User{
Id: uuid.NewV4().String(),
Name: r.Name,
Username: r.Username,
},
Password: string(pass),
CreatedAt: t,
UpdatedAt: t,
LastActivityAt: t,
}
err = as.UserManager.CreateUser(user)
if err != nil {
return nil, errors.Wrap(err, "Failed to signUp")
}
token, err := as.generateToken(user)
if err != nil {
return nil, err
}
return &pb.Token{token}, nil
}
func (as *AuthServer) SignIn(cx context.Context, r *pb.SignInRequest) (*pb.Token, error) {
u, err := as.UserManager.GetUserByUsername(r.Username)
if err != nil {
return nil, grpc.Errorf(codes.PermissionDenied, "Username or password invalid")
}
if bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(r.Password)) != nil {
return nil, grpc.Errorf(codes.PermissionDenied, "Username or password invalid")
}
token, err := as.generateToken(u)
if err != nil {
return nil, err
}
return &pb.Token{token}, nil
}
func (as *AuthServer) generateToken(user *User) (string, error) {
claims := jwt.StandardClaims{
Audience: user.Id,
ExpiresAt: time.Now().Add(time.Hour * 96).Unix(),
Issuer: "auth.service",
IssuedAt: time.Now().Unix(),
}
t := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
ts, err := t.SignedString(as.JwtPrivateKey)
if err != nil {
return "", errors.Wrap(err, "Failed to create the auth token")
}
return ts, nil
}