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parsers.go
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/
parsers.go
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/**
* Copyright 2021 Comcast Cable Communications Management, LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package acquire
import (
"encoding/json"
"errors"
"fmt"
"time"
"github.com/golang-jwt/jwt"
"github.com/spf13/cast"
)
var (
errMissingExpClaim = errors.New("missing exp claim in jwt")
errUnexpectedCasting = errors.New("unexpected casting error")
)
// TokenParser defines the function signature of a bearer token extractor from a payload.
type TokenParser func([]byte) (string, error)
// ParseExpiration defines the function signature of a bearer token expiration date extractor.
type ParseExpiration func([]byte) (time.Time, error)
// DefaultTokenParser extracts a bearer token as defined by a SimpleBearer in a payload.
func DefaultTokenParser(data []byte) (string, error) {
var bearer SimpleBearer
if errUnmarshal := json.Unmarshal(data, &bearer); errUnmarshal != nil {
return "", fmt.Errorf("unable to parse bearer token: %w", errUnmarshal)
}
return bearer.Token, nil
}
// DefaultExpirationParser extracts a bearer token expiration date as defined by a SimpleBearer in a payload.
func DefaultExpirationParser(data []byte) (time.Time, error) {
var bearer SimpleBearer
if errUnmarshal := json.Unmarshal(data, &bearer); errUnmarshal != nil {
return time.Time{}, fmt.Errorf("unable to parse bearer token expiration: %w", errUnmarshal)
}
return time.Now().Add(time.Duration(bearer.ExpiresInSeconds) * time.Second), nil
}
func RawTokenParser(data []byte) (string, error) {
return string(data), nil
}
func RawTokenExpirationParser(data []byte) (time.Time, error) {
p := jwt.Parser{SkipClaimsValidation: true}
token, _, err := p.ParseUnverified(string(data), jwt.MapClaims{})
if err != nil {
return time.Time{}, err
}
claims, ok := token.Claims.(jwt.MapClaims)
if !ok {
return time.Time{}, errUnexpectedCasting
}
expVal, ok := claims["exp"]
if !ok {
return time.Time{}, errMissingExpClaim
}
exp, err := cast.ToInt64E(expVal)
if err != nil {
return time.Time{}, err
}
return time.Unix(exp, 0), nil
}