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package gitalyauth
import (
"context"
"encoding/base64"
"fmt"
"strconv"
"time"
"google.golang.org/grpc/credentials"
)
// RPCCredentials can be used with grpc.WithPerRPCCredentials to create a
// grpc.DialOption that inserts the supplied token for authentication
// with a Gitaly server.
func RPCCredentials(token string) credentials.PerRPCCredentials {
return &rpcCredentials{token: base64.StdEncoding.EncodeToString([]byte(token))}
}
type rpcCredentials struct {
token string
}
func (*rpcCredentials) RequireTransportSecurity() bool { return false }
func (rc *rpcCredentials) GetRequestMetadata(context.Context, ...string) (map[string]string, error) {
return map[string]string{"authorization": "Bearer " + rc.token}, nil
}
// RPCCredentialsV2 can be used with grpc.WithPerRPCCredentials to create a
// grpc.DialOption that inserts an HMAC token with the current timestamp
// for authentication with a Gitaly server.
func RPCCredentialsV2(token string) credentials.PerRPCCredentials {
return &rpcCredentialsV2{token: token}
}
type rpcCredentialsV2 struct {
token string
}
func (*rpcCredentialsV2) RequireTransportSecurity() bool { return false }
func (rc *rpcCredentialsV2) GetRequestMetadata(context.Context, ...string) (map[string]string, error) {
return map[string]string{"authorization": "Bearer " + rc.hmacToken()}, nil
}
func (rc *rpcCredentialsV2) hmacToken() string {
return hmacToken("v2", []byte(rc.token), time.Now())
}
func hmacToken(version string, secret []byte, timestamp time.Time) string {
intTime := timestamp.Unix()
signedTimestamp := hmacSign(secret, strconv.FormatInt(intTime, 10))
return fmt.Sprintf("%s.%x.%d", version, signedTimestamp, intTime)
}
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