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headscale.go
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headscale.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Greenhouse contributors
// SPDX-License-Identifier: Apache-2.0
package clientutil
import (
"context"
"net"
"os"
v1 "github.com/juanfont/headscale/gen/go/headscale/v1"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/insecure"
"sigs.k8s.io/controller-runtime/pkg/log"
)
const (
SocketWritePermissions = 0o666
)
// NewHeadscaleGRPCClient returns a new gRPC client for the Headscale API.
func NewHeadscaleGRPCClient(url, apiKey string) (v1.HeadscaleServiceClient, error) {
grpcOptions := []grpc.DialOption{
grpc.WithPerRPCCredentials(tokenAuth{
token: apiKey,
}),
grpc.WithTransportCredentials(credentials.NewClientTLSFromCert(nil, "")),
}
cc, err := grpc.DialContext(context.TODO(), url, grpcOptions...)
if err != nil {
return nil, err
}
cl := v1.NewHeadscaleServiceClient(cc)
return cl, nil
}
func NewHeadscaleGRPCSocketClient(socketPath string) (v1.HeadscaleServiceClient, error) {
// Call the headscale agent socket
grpcOptions := []grpc.DialOption{
grpc.WithBlock(),
}
socket, err := os.OpenFile(socketPath, os.O_WRONLY, SocketWritePermissions)
if err != nil {
if os.IsPermission(err) {
log.FromContext(context.Background()).Error(err, "permission denied to open socket")
return nil, err
}
if os.IsNotExist(err) {
log.FromContext(context.Background()).Error(err, "socket does not exist", "socketPath", socketPath)
return nil, err
}
}
socket.Close()
grpcOptions = append(
grpcOptions,
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithContextDialer(grpcDialer),
)
cc, err := grpc.DialContext(context.Background(), socketPath, grpcOptions...)
if err != nil {
return nil, err
}
cl := v1.NewHeadscaleServiceClient(cc)
return cl, nil
}
func grpcDialer(ctx context.Context, addr string) (net.Conn, error) {
var d net.Dialer
return d.DialContext(ctx, "unix", addr)
}
// tokenAuth struct to pass the token over the gRPC call.
type tokenAuth struct {
token string
}
// Return value is mapped to request headers.
func (t tokenAuth) GetRequestMetadata(ctx context.Context, in ...string) (map[string]string, error) {
return map[string]string{
"authorization": "Bearer " + t.token,
}, nil
}
func (tokenAuth) RequireTransportSecurity() bool {
return true
}