forked from cloudfoundry/gorouter
/
token.go
94 lines (73 loc) · 1.92 KB
/
token.go
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package authentication
import (
"encoding/pem"
"errors"
"strings"
"github.com/dgrijalva/jwt-go"
)
//go:generate counterfeiter -o fakes/fake_token.go . Token
type Token interface {
DecodeToken(userToken string, desiredPermissions ...string) error
CheckPublicToken() error
}
type NullToken struct{}
func (_ NullToken) DecodeToken(_ string, _ ...string) error {
return nil
}
func (_ NullToken) CheckPublicToken() error {
return nil
}
type accessToken struct {
uaaPublicKey string
}
func NewAccessToken(uaaPublicKey string) accessToken {
return accessToken{
uaaPublicKey: uaaPublicKey,
}
}
func (accessToken accessToken) DecodeToken(userToken string, desiredPermissions ...string) error {
userToken, err := checkTokenFormat(userToken)
if err != nil {
return err
}
token, err := jwt.Parse(userToken, func(t *jwt.Token) (interface{}, error) {
return []byte(accessToken.uaaPublicKey), nil
})
if err != nil {
return err
}
hasPermission := false
permissions := token.Claims["scope"]
a := permissions.([]interface{})
for _, permission := range a {
for _, desiredPermission := range desiredPermissions {
if permission.(string) == desiredPermission {
hasPermission = true
break
}
}
}
if !hasPermission {
err = errors.New("Token does not have '" + strings.Join(desiredPermissions, "', '") + "' scope")
return err
}
return nil
}
func (accessToken accessToken) CheckPublicToken() error {
var block *pem.Block
if block, _ = pem.Decode([]byte(accessToken.uaaPublicKey)); block == nil {
return errors.New("Public uaa token must be PEM encoded")
}
return nil
}
func checkTokenFormat(token string) (string, error) {
tokenParts := strings.Split(token, " ")
if len(tokenParts) != 2 {
return "", errors.New("Invalid token format")
}
tokenType, userToken := tokenParts[0], tokenParts[1]
if tokenType != "bearer" {
return "", errors.New("Invalid token type: " + tokenType)
}
return userToken, nil
}