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jwt_access.go
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jwt_access.go
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package generates
import (
"fmt"
"strings"
"time"
errs "errors"
"github.com/dgrijalva/jwt-go"
"github.com/litmuschaos/litmus/litmus-portal/backend/auth/pkg/errors"
"github.com/litmuschaos/litmus/litmus-portal/backend/auth/pkg/models"
"github.com/litmuschaos/litmus/litmus-portal/backend/auth/pkg/types"
)
// JWTAccessClaims jwt claims
type JWTAccessClaims struct {
UserName string `json:"username,omitempty"`
Email string `json:"email,omitempty"`
Name string `json:"name,omitempty"`
jwt.StandardClaims
}
// NewJWTAccessGenerate create to generate the jwt access token instance
func NewJWTAccessGenerate(key []byte, method jwt.SigningMethod) *JWTAccessGenerate {
return &JWTAccessGenerate{
SignedKey: key,
SignedMethod: method,
}
}
// GenerateBasic provide the basis of the generated token data
type GenerateBasic struct {
UserInfo *models.PublicUserInfo
CreateAt *time.Time
TokenInfo *models.Token
}
// JWTAccessGenerate generate the jwt access token
type JWTAccessGenerate struct {
SignedKey []byte
SignedMethod jwt.SigningMethod
}
// Token based on the UUID generated token
func (a *JWTAccessGenerate) Token(data *GenerateBasic) (string, error) {
claims := &JWTAccessClaims{
UserName: data.UserInfo.GetUserName(),
Email: data.UserInfo.GetEmail(),
Name: data.UserInfo.GetName(),
StandardClaims: jwt.StandardClaims{
IssuedAt: time.Now().Unix(),
ExpiresAt: data.TokenInfo.GetAccessCreateAt().Add(data.TokenInfo.GetAccessExpiresIn()).Unix(),
},
}
token := jwt.NewWithClaims(a.SignedMethod, claims)
var key interface{}
if a.isEs() {
v, err := jwt.ParseECPrivateKeyFromPEM(a.SignedKey)
if err != nil {
return "", err
}
key = v
} else if a.isRsOrPS() {
v, err := jwt.ParseRSAPrivateKeyFromPEM(a.SignedKey)
if err != nil {
return "", err
}
key = v
} else if a.isHs() {
key = a.SignedKey
} else {
return "", errs.New("unsupported sign method")
}
access, err := token.SignedString(key)
if err != nil {
return "", err
}
return access, nil
}
func (a *JWTAccessGenerate) isEs() bool {
return strings.HasPrefix(a.SignedMethod.Alg(), "ES")
}
func (a *JWTAccessGenerate) isRsOrPS() bool {
isRs := strings.HasPrefix(a.SignedMethod.Alg(), "RS")
isPs := strings.HasPrefix(a.SignedMethod.Alg(), "PS")
return isRs || isPs
}
func (a *JWTAccessGenerate) isHs() bool {
return strings.HasPrefix(a.SignedMethod.Alg(), "HS")
}
// Validate validates the token
func (a *JWTAccessGenerate) Validate(tokenString string) (bool, error) {
token, err := a.parseToken(tokenString)
if err != nil {
return false, err
}
return token.Valid, nil
}
// Parse parses a UserName from a token
func (a *JWTAccessGenerate) Parse(tokenString string) (*models.PublicUserInfo, error) {
token, err := a.parseToken(tokenString)
if err != nil {
return nil, err
}
var userInfo *models.PublicUserInfo = new(models.PublicUserInfo)
if claims, ok := token.Claims.(*JWTAccessClaims); ok && token.Valid {
userInfo.Email = claims.Email
userInfo.Name = claims.Name
userInfo.UserName = claims.UserName
return userInfo, nil
}
return nil, errors.ErrInvalidAccessToken
}
func (a *JWTAccessGenerate) parseToken(tokenString string) (*jwt.Token, error) {
return jwt.ParseWithClaims(tokenString, &JWTAccessClaims{}, func(token *jwt.Token) (interface{}, error) {
// Validating the signing method
if ok := token.Method.Alg() == a.SignedMethod.Alg(); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return []byte(types.DefaultAPISecret), nil
})
}