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@yangzhouhan @iamqizhao @yihuazhang @menghanl @dfawley @tamird @wallaceicy06 @mikewiacek @jtattermusch @broady
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/*
*
* Copyright 2015 gRPC authors.
*
* 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 oauth implements gRPC credentials using OAuth.
package oauth
import (
"context"
"fmt"
"io/ioutil"
"sync"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"golang.org/x/oauth2/jwt"
"google.golang.org/grpc/credentials"
)
// TokenSource supplies PerRPCCredentials from an oauth2.TokenSource.
type TokenSource struct {
oauth2.TokenSource
}
// GetRequestMetadata gets the request metadata as a map from a TokenSource.
func (ts TokenSource) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
token, err := ts.Token()
if err != nil {
return nil, err
}
ri, _ := credentials.RequestInfoFromContext(ctx)
if err = credentials.CheckSecurityLevel(ri.AuthInfo, credentials.PrivacyAndIntegrity); err != nil {
return nil, fmt.Errorf("unable to transfer TokenSource PerRPCCredentials: %v", err)
}
return map[string]string{
"authorization": token.Type() + " " + token.AccessToken,
}, nil
}
// RequireTransportSecurity indicates whether the credentials requires transport security.
func (ts TokenSource) RequireTransportSecurity() bool {
return true
}
type jwtAccess struct {
jsonKey []byte
}
// NewJWTAccessFromFile creates PerRPCCredentials from the given keyFile.
func NewJWTAccessFromFile(keyFile string) (credentials.PerRPCCredentials, error) {
jsonKey, err := ioutil.ReadFile(keyFile)
if err != nil {
return nil, fmt.Errorf("credentials: failed to read the service account key file: %v", err)
}
return NewJWTAccessFromKey(jsonKey)
}
// NewJWTAccessFromKey creates PerRPCCredentials from the given jsonKey.
func NewJWTAccessFromKey(jsonKey []byte) (credentials.PerRPCCredentials, error) {
return jwtAccess{jsonKey}, nil
}
func (j jwtAccess) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
// TODO: the returned TokenSource is reusable. Store it in a sync.Map, with
// uri as the key, to avoid recreating for every RPC.
ts, err := google.JWTAccessTokenSourceFromJSON(j.jsonKey, uri[0])
if err != nil {
return nil, err
}
token, err := ts.Token()
if err != nil {
return nil, err
}
ri, _ := credentials.RequestInfoFromContext(ctx)
if err = credentials.CheckSecurityLevel(ri.AuthInfo, credentials.PrivacyAndIntegrity); err != nil {
return nil, fmt.Errorf("unable to transfer jwtAccess PerRPCCredentials: %v", err)
}
return map[string]string{
"authorization": token.Type() + " " + token.AccessToken,
}, nil
}
func (j jwtAccess) RequireTransportSecurity() bool {
return true
}
// oauthAccess supplies PerRPCCredentials from a given token.
type oauthAccess struct {
token oauth2.Token
}
// NewOauthAccess constructs the PerRPCCredentials using a given token.
func NewOauthAccess(token *oauth2.Token) credentials.PerRPCCredentials {
return oauthAccess{token: *token}
}
func (oa oauthAccess) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
ri, _ := credentials.RequestInfoFromContext(ctx)
if err := credentials.CheckSecurityLevel(ri.AuthInfo, credentials.PrivacyAndIntegrity); err != nil {
return nil, fmt.Errorf("unable to transfer oauthAccess PerRPCCredentials: %v", err)
}
return map[string]string{
"authorization": oa.token.Type() + " " + oa.token.AccessToken,
}, nil
}
func (oa oauthAccess) RequireTransportSecurity() bool {
return true
}
// NewComputeEngine constructs the PerRPCCredentials that fetches access tokens from
// Google Compute Engine (GCE)'s metadata server. It is only valid to use this
// if your program is running on a GCE instance.
// TODO(dsymonds): Deprecate and remove this.
func NewComputeEngine() credentials.PerRPCCredentials {
return TokenSource{google.ComputeTokenSource("")}
}
// serviceAccount represents PerRPCCredentials via JWT signing key.
type serviceAccount struct {
mu sync.Mutex
config *jwt.Config
t *oauth2.Token
}
func (s *serviceAccount) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
s.mu.Lock()
defer s.mu.Unlock()
if !s.t.Valid() {
var err error
s.t, err = s.config.TokenSource(ctx).Token()
if err != nil {
return nil, err
}
}
ri, _ := credentials.RequestInfoFromContext(ctx)
if err := credentials.CheckSecurityLevel(ri.AuthInfo, credentials.PrivacyAndIntegrity); err != nil {
return nil, fmt.Errorf("unable to transfer serviceAccount PerRPCCredentials: %v", err)
}
return map[string]string{
"authorization": s.t.Type() + " " + s.t.AccessToken,
}, nil
}
func (s *serviceAccount) RequireTransportSecurity() bool {
return true
}
// NewServiceAccountFromKey constructs the PerRPCCredentials using the JSON key slice
// from a Google Developers service account.
func NewServiceAccountFromKey(jsonKey []byte, scope ...string) (credentials.PerRPCCredentials, error) {
config, err := google.JWTConfigFromJSON(jsonKey, scope...)
if err != nil {
return nil, err
}
return &serviceAccount{config: config}, nil
}
// NewServiceAccountFromFile constructs the PerRPCCredentials using the JSON key file
// of a Google Developers service account.
func NewServiceAccountFromFile(keyFile string, scope ...string) (credentials.PerRPCCredentials, error) {
jsonKey, err := ioutil.ReadFile(keyFile)
if err != nil {
return nil, fmt.Errorf("credentials: failed to read the service account key file: %v", err)
}
return NewServiceAccountFromKey(jsonKey, scope...)
}
// NewApplicationDefault returns "Application Default Credentials". For more
// detail, see https://developers.google.com/accounts/docs/application-default-credentials.
func NewApplicationDefault(ctx context.Context, scope ...string) (credentials.PerRPCCredentials, error) {
creds, err := google.FindDefaultCredentials(ctx, scope...)
if err != nil {
return nil, err
}
// If JSON is nil, the authentication is provided by the environment and not
// with a credentials file, e.g. when code is running on Google Cloud
// Platform. Use the returned token source.
if creds.JSON == nil {
return TokenSource{creds.TokenSource}, nil
}
// If auth is provided by env variable or creds file, the behavior will be
// different based on whether scope is set. Because the returned
// creds.TokenSource does oauth with jwt by default, and it requires scope.
// We can only use it if scope is not empty, otherwise it will fail with
// missing scope error.
//
// If scope is set, use it, it should just work.
//
// If scope is not set, we try to use jwt directly without oauth (this only
// works if it's a service account).
if len(scope) != 0 {
return TokenSource{creds.TokenSource}, nil
}
// Try to convert JSON to a jwt config without setting the optional scope
// parameter to check if it's a service account (the function errors if it's
// not). This is necessary because the returned config doesn't show the type
// of the account.
if _, err := google.JWTConfigFromJSON(creds.JSON); err != nil {
// If this fails, it's not a service account, return the original
// TokenSource from above.
return TokenSource{creds.TokenSource}, nil
}
// If it's a service account, create a JWT only access with the key.
return NewJWTAccessFromKey(creds.JSON)
}