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f9ce19ea30
Adds support for service account impersonation when a URL for service account impersonation is provided. Change-Id: I9f3bbd6926212cecb13938fc5dac358ba56855b8 GitHub-Last-Rev: 9c218789db45e9b80bb8bec5c69539dd386d9668 GitHub-Pull-Request: golang/oauth2#468 Reviewed-on: https://go-review.googlesource.com/c/oauth2/+/285012 Run-TryBot: Cody Oss <codyoss@google.com> TryBot-Result: Go Bot <gobot@golang.org> Trust: Cody Oss <codyoss@google.com> Trust: Tyler Bui-Palsulich <tbp@google.com> Reviewed-by: Cody Oss <codyoss@google.com>
84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package externalaccount
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"golang.org/x/oauth2"
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"io"
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"io/ioutil"
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"net/http"
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"time"
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)
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// generateAccesstokenReq is used for service account impersonation
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type generateAccessTokenReq struct {
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Delegates []string `json:"delegates,omitempty"`
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Lifetime string `json:"lifetime,omitempty"`
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Scope []string `json:"scope,omitempty"`
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}
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type impersonateTokenResponse struct {
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AccessToken string `json:"accessToken"`
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ExpireTime string `json:"expireTime"`
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}
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type impersonateTokenSource struct {
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ctx context.Context
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ts oauth2.TokenSource
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url string
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scopes []string
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}
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// Token performs the exchange to get a temporary service account
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func (its impersonateTokenSource) Token() (*oauth2.Token, error) {
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reqBody := generateAccessTokenReq{
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Lifetime: "3600s",
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Scope: its.scopes,
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}
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b, err := json.Marshal(reqBody)
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if err != nil {
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return nil, fmt.Errorf("oauth2/google: unable to marshal request: %v", err)
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}
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client := oauth2.NewClient(its.ctx, its.ts)
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req, err := http.NewRequest("POST", its.url, bytes.NewReader(b))
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if err != nil {
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return nil, fmt.Errorf("oauth2/google: unable to create impersonation request: %v", err)
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}
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req = req.WithContext(its.ctx)
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req.Header.Set("Content-Type", "application/json")
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resp, err := client.Do(req)
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if err != nil {
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return nil, fmt.Errorf("oauth2/google: unable to generate access token: %v", err)
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(io.LimitReader(resp.Body, 1<<20))
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if err != nil {
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return nil, fmt.Errorf("oauth2/google: unable to read body: %v", err)
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}
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if c := resp.StatusCode; c < 200 || c > 299 {
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return nil, fmt.Errorf("oauth2/google: status code %d: %s", c, body)
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}
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var accessTokenResp impersonateTokenResponse
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if err := json.Unmarshal(body, &accessTokenResp); err != nil {
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return nil, fmt.Errorf("oauth2/google: unable to parse response: %v", err)
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}
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expiry, err := time.Parse(time.RFC3339, accessTokenResp.ExpireTime)
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if err != nil {
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return nil, fmt.Errorf("oauth2/google: unable to parse expiry: %v", err)
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}
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return &oauth2.Token{
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AccessToken: accessTokenResp.AccessToken,
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Expiry: expiry,
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TokenType: "Bearer",
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}, nil
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}
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