111 lines
3.4 KiB
Go
111 lines
3.4 KiB
Go
/*
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MIT License
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Copyright (c) Microsoft Corporation.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE
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*/
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/*
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Copyright 2022 The Flux authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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This package exchanges an ARM access token for an ACR access token on Azure
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It has been derived from
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https://github.com/Azure/msi-acrpull/blob/main/pkg/authorizer/token_exchanger.go
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since the project isn't actively maintained.
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*/
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package azure
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"net/url"
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)
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type tokenResponse struct {
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AccessToken string `json:"access_token"`
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RefreshToken string `json:"refresh_token"`
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Resource string `json:"resource"`
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TokenType string `json:"token_type"`
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}
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type acrError struct {
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Code string `json:"code"`
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Message string `json:"message"`
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}
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type Exchanger struct {
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acrFQDN string
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}
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func NewExchanger(acrEndpoint string) *Exchanger {
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return &Exchanger{
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acrFQDN: acrEndpoint,
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}
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}
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func (e *Exchanger) ExchangeACRAccessToken(armToken string) (string, error) {
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exchangeUrl := fmt.Sprintf("https://%s/oauth2/exchange", e.acrFQDN)
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parsedURL, err := url.Parse(exchangeUrl)
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if err != nil {
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return "", err
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}
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parameters := url.Values{}
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parameters.Add("grant_type", "access_token")
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parameters.Add("service", parsedURL.Hostname())
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parameters.Add("access_token", armToken)
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resp, err := http.PostForm(exchangeUrl, parameters)
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if err != nil {
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return "", fmt.Errorf("failed to send token exchange request: %w", err)
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}
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if resp.StatusCode != http.StatusOK {
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var errors []acrError
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decoder := json.NewDecoder(resp.Body)
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if err = decoder.Decode(&errors); err == nil {
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return "", fmt.Errorf("unexpected status code %d from exchnage request: errors:%s",
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resp.StatusCode, errors)
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}
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return "", fmt.Errorf("unexpected status code %d from exchnage request", resp.StatusCode)
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}
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var tokenResp tokenResponse
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decoder := json.NewDecoder(resp.Body)
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if err = decoder.Decode(&tokenResp); err != nil {
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return "", err
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}
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return tokenResp.RefreshToken, nil
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}
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