forked from GoogleCloudPlatform/gcsfuse
/
proxy.go
99 lines (87 loc) · 2.31 KB
/
proxy.go
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// Copyright 2020 Google Inc. All Rights Reserved.
//
// 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 auth
import (
"context"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"net/url"
"golang.org/x/oauth2"
)
// newProxyTokenSource returns a TokenSource that calls an external
// endpoint for authentication and access tokens.
func newProxyTokenSource(
ctx context.Context,
endpoint string,
reuseTokenFromUrl bool,
) (ts oauth2.TokenSource, err error) {
u, err := url.Parse(endpoint)
if err != nil {
err = fmt.Errorf("newProxyTokenSource cannot parse endpoint %s: %w", endpoint, err)
return
}
client := &http.Client{}
if u.Scheme == "unix" {
client.Transport = &http.Transport{
DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
dialer := net.Dialer{}
return dialer.DialContext(ctx, u.Scheme, u.Path)
},
}
endpoint = "http://unix?" + u.RawQuery
}
ts = proxyTokenSource{
ctx: ctx,
endpoint: endpoint,
client: client,
}
if reuseTokenFromUrl {
return oauth2.ReuseTokenSource(nil, ts), nil
}
return ts, nil
}
type proxyTokenSource struct {
ctx context.Context
endpoint string
client *http.Client
}
func (ts proxyTokenSource) Token() (token *oauth2.Token, err error) {
resp, err := ts.client.Get(ts.endpoint)
if err != nil {
err = fmt.Errorf("proxyTokenSource cannot fetch token: %w", err)
return
}
body, err := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
if err != nil {
err = fmt.Errorf("proxyTokenSource cannot load body: %w", err)
return
}
if c := resp.StatusCode; c < 200 || c >= 300 {
err = &oauth2.RetrieveError{
Response: resp,
Body: body,
}
return
}
token = &oauth2.Token{}
err = json.Unmarshal(body, token)
if err != nil {
err = fmt.Errorf("proxyTokenSource cannot decode body: %w", err)
return
}
return
}