Marvin Preuss
d095180eb4
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75 lines
2.5 KiB
Go
75 lines
2.5 KiB
Go
// Copyright 2020 The Go Cloud Development Kit Authors
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//
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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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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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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 is an implementation for Options.MakeSignBytes
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// that serves as example for how to keep a private key in a separate
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// process, service, or HSM/TPM, yet use it as signer for blob.Bucket.
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package gcsblob
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import (
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"context"
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"sync"
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credentials "cloud.google.com/go/iam/credentials/apiv1"
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gax "github.com/googleapis/gax-go/v2"
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credentialspb "google.golang.org/genproto/googleapis/iam/credentials/v1"
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)
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// credentialsClient wraps the IAM Credentials API client for a lazy initialization
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// and expresses it in the reduced format expected by SignBytes.
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// See https://cloud.google.com/iam/docs/reference/credentials/rest
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type credentialsClient struct {
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init sync.Once
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err error
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// client as reduced surface of credentials.IamCredentialsClient
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// enables us to use a mock in tests.
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client interface {
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SignBlob(context.Context, *credentialspb.SignBlobRequest, ...gax.CallOption) (*credentialspb.SignBlobResponse, error)
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}
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}
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// CreateMakeSignBytesWith produces a MakeSignBytes variant from an expanded parameter set.
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// It essentially adapts a remote call to the IAM Credentials API
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// to the function signature expected by storage.SignedURLOptions.SignBytes.
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func (c *credentialsClient) CreateMakeSignBytesWith(lifetimeCtx context.Context, googleAccessID string) func(context.Context) SignBytesFunc {
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return func(requestCtx context.Context) SignBytesFunc {
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c.init.Do(func() {
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if c.client != nil {
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// Set previously, likely to a mock implementation for tests.
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return
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}
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c.client, c.err = credentials.NewIamCredentialsClient(lifetimeCtx)
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})
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return func(p []byte) ([]byte, error) {
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if c.err != nil {
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return nil, c.err
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}
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resp, err := c.client.SignBlob(
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requestCtx,
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&credentialspb.SignBlobRequest{
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Name: googleAccessID,
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Payload: p,
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})
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if err != nil {
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return nil, err
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}
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return resp.GetSignedBlob(), nil
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}
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}
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}
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