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tokenizer.go
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tokenizer.go
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// Copyright (c) Abstract Machines
// SPDX-License-Identifier: Apache-2.0
package jwt
import (
"context"
"encoding/json"
"fmt"
"strconv"
"github.com/absmach/magistrala/auth"
"github.com/absmach/magistrala/pkg/errors"
"github.com/lestrrat-go/jwx/v2/jwa"
"github.com/lestrrat-go/jwx/v2/jwt"
)
var (
errInvalidIssuer = errors.New("invalid token issuer value")
// errJWTExpiryKey is used to check if the token is expired.
errJWTExpiryKey = errors.New(`"exp" not satisfied`)
// ErrExpiry indicates that the token is expired.
ErrExpiry = errors.New("token is expired")
// ErrSetClaim indicates an inability to set the claim.
ErrSetClaim = errors.New("failed to set claim")
// ErrSignJWT indicates an error in signing jwt token.
ErrSignJWT = errors.New("failed to sign jwt token")
// ErrParseToken indicates a failure to parse the token.
ErrParseToken = errors.New("failed to parse token")
// ErrValidateJWTToken indicates a failure to validate JWT token.
ErrValidateJWTToken = errors.New("failed to validate jwt token")
// ErrJSONHandle indicates an error in handling JSON.
ErrJSONHandle = errors.New("failed to perform operation JSON")
)
const (
issuerName = "magistrala.auth"
tokenType = "type"
userField = "user"
domainField = "domain"
)
type tokenizer struct {
secret []byte
}
var _ auth.Tokenizer = (*tokenizer)(nil)
// NewRepository instantiates an implementation of Token repository.
func New(secret []byte) auth.Tokenizer {
return &tokenizer{
secret: secret,
}
}
func (repo *tokenizer) Issue(key auth.Key) (string, error) {
builder := jwt.NewBuilder()
builder.
Issuer(issuerName).
IssuedAt(key.IssuedAt).
Subject(key.Subject).
Claim(tokenType, key.Type).
Expiration(key.ExpiresAt)
builder.Claim(userField, key.User)
builder.Claim(domainField, key.Domain)
if key.ID != "" {
builder.JwtID(key.ID)
}
tkn, err := builder.Build()
if err != nil {
return "", errors.Wrap(errors.ErrAuthentication, err)
}
signedTkn, err := jwt.Sign(tkn, jwt.WithKey(jwa.HS512, repo.secret))
if err != nil {
return "", errors.Wrap(ErrSignJWT, err)
}
return string(signedTkn), nil
}
func (repo *tokenizer) Parse(token string) (auth.Key, error) {
tkn, err := jwt.Parse(
[]byte(token),
jwt.WithValidate(true),
jwt.WithKey(jwa.HS512, repo.secret),
)
if err != nil {
if errors.Contains(err, errJWTExpiryKey) {
return auth.Key{}, ErrExpiry
}
return auth.Key{}, errors.Wrap(errors.ErrAuthentication, err)
}
validator := jwt.ValidatorFunc(func(_ context.Context, t jwt.Token) jwt.ValidationError {
if t.Issuer() != issuerName {
return jwt.NewValidationError(errInvalidIssuer)
}
return nil
})
if err := jwt.Validate(tkn, jwt.WithValidator(validator)); err != nil {
return auth.Key{}, errors.Wrap(ErrValidateJWTToken, err)
}
jsn, err := json.Marshal(tkn.PrivateClaims())
if err != nil {
return auth.Key{}, errors.Wrap(ErrJSONHandle, err)
}
var key auth.Key
if err := json.Unmarshal(jsn, &key); err != nil {
return auth.Key{}, errors.Wrap(ErrJSONHandle, err)
}
tType, ok := tkn.Get(tokenType)
if !ok {
return auth.Key{}, errors.Wrap(errors.ErrAuthentication, err)
}
ktype, err := strconv.ParseInt(fmt.Sprintf("%v", tType), 10, 64)
if err != nil {
return auth.Key{}, errors.Wrap(errors.ErrAuthentication, err)
}
key.ID = tkn.JwtID()
key.Type = auth.KeyType(ktype)
key.Issuer = tkn.Issuer()
key.Subject = tkn.Subject()
key.IssuedAt = tkn.IssuedAt()
key.ExpiresAt = tkn.Expiration()
return key, nil
}