/
urlopener.go
108 lines (94 loc) · 2.5 KB
/
urlopener.go
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//
// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
//
// 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
//
// https://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 urlopener
import (
"context"
"io/ioutil"
"net/http"
"reflect"
"unsafe"
"cloud.google.com/go/storage"
"gocloud.dev/blob/gcsblob"
"gocloud.dev/gcp"
"golang.org/x/oauth2/google"
"github.com/vdaas/vald/internal/errors"
)
// URLOpener returns gcsblob.URLOpener and error.
type URLOpener interface {
URLOpener(context.Context) (*gcsblob.URLOpener, error)
}
type urlOpener struct {
credentialsFilePath string
credentialsJSON string
client *http.Client
}
// New returns URLOpener implementation.
func New(opts ...Option) (URLOpener, error) {
uo := new(urlOpener)
for _, opt := range opts {
if err := opt(uo); err != nil {
return nil, errors.ErrOptionFailed(err, reflect.ValueOf(opt))
}
}
if uo.client == nil {
return nil, errors.NewErrInvalidOption("client", uo.client)
}
return uo, nil
}
func (uo *urlOpener) URLOpener(ctx context.Context) (guo *gcsblob.URLOpener, err error) {
var creds *google.Credentials
scope := storage.ScopeReadWrite
switch {
case len(uo.credentialsFilePath) != 0:
data, err := ioutil.ReadFile(uo.credentialsFilePath)
if err != nil {
return nil, err
}
creds, err = google.CredentialsFromJSON(ctx, data, scope)
if err != nil {
return nil, err
}
case len(uo.credentialsJSON) != 0:
data := *(*[]byte)(unsafe.Pointer(&uo.credentialsJSON))
creds, err = google.CredentialsFromJSON(ctx, data, scope)
if err != nil {
return nil, err
}
default:
creds, err = google.FindDefaultCredentials(ctx, scope)
if err != nil {
return nil, err
}
}
cfg, err := google.JWTConfigFromJSON(creds.JSON, scope)
if err != nil {
return nil, err
}
client, err := gcp.NewHTTPClient(
uo.client.Transport,
gcp.CredentialsTokenSource(creds),
)
if err != nil {
return nil, err
}
return &gcsblob.URLOpener{
Client: client,
Options: gcsblob.Options{
GoogleAccessID: cfg.Email,
PrivateKey: cfg.PrivateKey,
},
}, nil
}