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token.go
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token.go
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package token
import (
"fmt"
"time"
"github.com/redhat-developer/app-services-cli/pkg/core/logging"
"github.com/golang-jwt/jwt/v4"
)
// Token contains the current access and refresh tokens from the Authorization server
type Token struct {
Logger logging.Logger
AccessToken string `json:"access_token,omitempty" doc:"Bearer access token."`
RefreshToken string `json:"refresh_token,omitempty" doc:"Offline or refresh token."`
}
func (t *Token) IsValid() (tokenIsValid bool, err error) {
now := time.Now()
if t.AccessToken != "" {
var expires bool
var left time.Duration
expires, left, err = GetExpiry(t.AccessToken, now)
if err != nil {
return
}
if !expires || left > 5*time.Second {
tokenIsValid = true
return
}
}
if t.RefreshToken != "" {
var expires bool
var left time.Duration
expires, left, err = GetExpiry(t.RefreshToken, now)
if err != nil {
return
}
if !expires || left > 10*time.Second {
tokenIsValid = true
return
}
}
return
}
// NeedsRefresh checks if the access token is missing,
// expired or nearing expiry and should be refreshed
func (t *Token) NeedsRefresh() bool {
if t.AccessToken == "" && t.RefreshToken != "" {
return true
}
now := time.Now()
expires, left, err := GetExpiry(t.AccessToken, now)
if err != nil {
t.Logger.Debug("Error while checking token expiry:", err)
return false
}
if !expires || left > 5*time.Minute {
t.Logger.Debug("Token is still valid. Expires in", left)
return false
}
return true
}
func Parse(textToken string) (token *jwt.Token, err error) {
parser := new(jwt.Parser)
token, _, err = parser.ParseUnverified(textToken, jwt.MapClaims{})
if err != nil {
err = fmt.Errorf("%v: %w", "unable to parse token", err)
return
}
return token, nil
}
func MapClaims(token *jwt.Token) (claims jwt.MapClaims, err error) {
claims, ok := token.Claims.(jwt.MapClaims)
if !ok {
err = fmt.Errorf("expected map claims but got \"%v\"", claims)
}
return claims, err
}
func GetExpiry(tokenStr string, now time.Time) (expires bool,
left time.Duration, err error) {
if tokenStr == "" {
return true, 0, nil
}
token, err := Parse(tokenStr)
if err != nil {
return false, 0, err
}
claims, err := MapClaims(token)
if err != nil {
return false, 0, err
}
var exp float64
claim, ok := claims["exp"]
if ok {
exp, ok = claim.(float64)
if !ok {
err = fmt.Errorf("expected floating point \"exp\" but got \"%v\"", claim)
return
}
}
if exp == 0 {
expires = false
left = 0
} else {
expires = true
left = time.Unix(int64(exp), 0).Sub(now)
}
return
}
// GetUsername extracts the username claim value from the JWT
func GetUsername(tokenStr string) (username string, ok bool) {
if tokenStr == "" {
return "", false
}
accessTkn, err := Parse(tokenStr)
if err != nil {
return "", false
}
tknClaims, _ := MapClaims(accessTkn)
u, ok := tknClaims["preferred_username"]
if ok {
username = fmt.Sprintf("%v", u)
return
}
u, ok = tknClaims["username"]
if ok {
username = fmt.Sprintf("%v", u)
return
}
return username, ok
}
// IsOrgAdmin returns the value of the `is_org_admin` claim
func IsOrgAdmin(tokenStr string) bool {
accessTkn, _ := Parse(tokenStr)
tknClaims, _ := MapClaims(accessTkn)
isAdminClaim, ok := tknClaims["is_org_admin"]
if !ok {
return false
}
orgAdmin, _ := isAdminClaim.(bool)
return orgAdmin
}