forked from Mirrors/oauth2
58 lines
1.8 KiB
Go
58 lines
1.8 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 downscope_test
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import (
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"context"
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"fmt"
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"golang.org/x/oauth2/google"
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"golang.org/x/oauth2"
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"golang.org/x/oauth2/google/downscope"
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)
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func ExampleNewTokenSource() {
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// This shows how to generate a downscoped token. This code would be run on the
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// token broker, which holds the root token used to generate the downscoped token.
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ctx := context.Background()
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// Initializes an accessBoundary with one Rule which restricts the downscoped
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// token to only be able to access the bucket "foo" and only grants it the
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// permission "storage.objectViewer".
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accessBoundary := []downscope.AccessBoundaryRule{
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{
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AvailableResource: "//storage.googleapis.com/projects/_/buckets/foo",
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AvailablePermissions: []string{"inRole:roles/storage.objectViewer"},
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},
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}
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var rootSource oauth2.TokenSource
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// This Source can be initialized in multiple ways; the following example uses
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// Application Default Credentials.
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rootSource, err := google.DefaultTokenSource(ctx, "https://www.googleapis.com/auth/cloud-platform")
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dts, err := downscope.NewTokenSource(ctx, downscope.DownscopingConfig{RootSource: rootSource, Rules: accessBoundary})
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if err != nil {
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fmt.Printf("failed to generate downscoped token source: %v", err)
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return
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}
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tok, err := dts.Token()
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if err != nil {
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fmt.Printf("failed to generate token: %v", err)
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return
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}
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_ = tok
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// You can now pass tok to a token consumer however you wish, such as exposing
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// a REST API and sending it over HTTP.
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// You can instead use the token held in dts to make
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// Google Cloud Storage calls, as follows:
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// storageClient, err := storage.NewClient(ctx, option.WithTokenSource(dts))
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}
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