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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package oauth2
import "fmt"
type configProvider interface {
GetTokens(identifier string) (string, string)
SaveTokens(identifier, accessToken, refreshToken string)
// ConfigBackedCachingProvider wraps a configProvider in order to conform to
// the cachingProvider interface
type ConfigBackedCachingProvider struct {
identifier string
config configProvider
// NewConfigBackedCachingProvider builds and returns a CachingTokenProvider
// that utilizes a configProvider to cache tokens
func NewConfigBackedCachingProvider(clientID, audience string, config configProvider) *ConfigBackedCachingProvider {
return &ConfigBackedCachingProvider{
identifier: fmt.Sprintf("%s-%s", clientID, audience),
config: config,
// GetTokens gets the tokens from the cache and returns them as a TokenResult
func (c *ConfigBackedCachingProvider) GetTokens() (*TokenResult, error) {
accessToken, refreshToken := c.config.GetTokens(c.identifier)
return &TokenResult{
AccessToken: accessToken,
RefreshToken: refreshToken,
}, nil
// CacheTokens caches the id and refresh token from TokenResult in the
// configProvider
func (c *ConfigBackedCachingProvider) CacheTokens(toCache *TokenResult) error {
c.config.SaveTokens(c.identifier, toCache.AccessToken, toCache.RefreshToken)
return nil