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token_supplier.go
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/
token_supplier.go
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/*
* Copyright 2022 Armory, Inc.
*
* 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 oidc
import (
"context"
"encoding/json"
"fmt"
clientcore "github.com/armory-io/go-commons/http/client/core"
"github.com/armory-io/go-commons/opentelemetry"
"go.uber.org/fx"
"math/rand"
"net/http"
"net/url"
"strings"
"sync"
"time"
)
type (
accessTokenResponse struct {
AccessToken string `json:"access_token"`
TokenType string `json:"token_type"`
ExpiresIn int32 `json:"expires_in"`
}
AccessToken struct {
AccessToken string
TokenType string
expiresAt time.Time
}
AccessTokenSupplierConfig struct {
ClientID string
ClientSecret string
TokenIssuerURL string
Audience string
}
AccessTokenSupplierParameters struct {
fx.In
Config AccessTokenSupplierConfig
Tracing opentelemetry.Configuration `optional:"true"`
}
AccessTokenSupplier struct {
// mu protects access to accessToken.
mu *sync.Mutex
accessToken *AccessToken
config AccessTokenSupplierConfig
http *http.Client
}
)
func NewAccessTokenSupplier(params AccessTokenSupplierParameters) *AccessTokenSupplier {
return &AccessTokenSupplier{
mu: &sync.Mutex{},
config: params.Config,
http: clientcore.NewHTTPClient(clientcore.Parameters{Tracing: params.Tracing}),
}
}
func (s *AccessTokenSupplier) GetRawTokenValue(ctx context.Context) (string, error) {
token, err := s.getAccessToken(ctx)
if err != nil {
return "", err
}
return token.AccessToken, nil
}
// GetToken is an alias for GetRawTokenValue.
func (s *AccessTokenSupplier) GetToken(ctx context.Context) (string, error) {
return s.GetRawTokenValue(ctx)
}
func (s *AccessTokenSupplier) GetAuthorizationHeaderValue(ctx context.Context) (string, error) {
token, err := s.getAccessToken(ctx)
if err != nil {
return "", err
}
return fmt.Sprintf("%s %s", token.TokenType, token.AccessToken), nil
}
func (s *AccessTokenSupplier) getAccessToken(ctx context.Context) (*AccessToken, error) {
s.mu.Lock()
defer s.mu.Unlock()
if s.accessToken == nil || time.Now().After(s.accessToken.expiresAt) {
token, err := s.fetchNewAccessToken(ctx)
if err != nil {
return nil, err
}
s.accessToken = token
}
return s.accessToken, nil
}
func (s *AccessTokenSupplier) fetchNewAccessToken(ctx context.Context) (*AccessToken, error) {
data := url.Values{}
data.Set("grant_type", "client_credentials")
data.Set("client_id", s.config.ClientID)
data.Set("client_secret", s.config.ClientSecret)
data.Set("audience", s.config.Audience)
req, err := http.NewRequestWithContext(ctx, http.MethodPost, s.config.TokenIssuerURL, strings.NewReader(data.Encode()))
if err != nil {
return nil, err
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.Header.Add("accept", "application/json")
res, err := s.http.Do(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode < 200 || res.StatusCode > 299 {
return nil, fmt.Errorf("unexpected status code while getting token %d", res.StatusCode)
}
var accessTokenResponse *accessTokenResponse
if err := json.NewDecoder(res.Body).Decode(&accessTokenResponse); err != nil {
return nil, err
}
expiresIn := time.Duration(rand.Int31n(accessTokenResponse.ExpiresIn)) * time.Second
leeway := time.Second * 120
expiresAt := time.Now().Add(expiresIn - leeway)
return &AccessToken{
AccessToken: accessTokenResponse.AccessToken,
TokenType: accessTokenResponse.TokenType,
expiresAt: expiresAt,
}, nil
}