expose KMS as plugin

sdk/plugin/kms/kms.go

@@ -0,0 +1,56 @@
+// Package kms defines the implementation for kms plugins.
+// KMS plugins allow to encrypt/decrypt sensitive data.
+package kms
+
+import (
+	"context"
+
+	"github.com/hashicorp/go-plugin"
+	"google.golang.org/grpc"
+
+	"github.com/drakkan/sftpgo/v2/sdk/plugin/kms/proto"
+)
+
+const (
+	// PluginName defines the name for a kms plugin
+	PluginName = "kms"
+)
+
+// Handshake is a common handshake that is shared by plugin and host.
+var Handshake = plugin.HandshakeConfig{
+	ProtocolVersion:  1,
+	MagicCookieKey:   "SFTPGO_KMS_PLUGIN",
+	MagicCookieValue: "223e3571-7ed2-4b96-b4b3-c7eb87d7ca1d",
+}
+
+// PluginMap is the map of plugins we can dispense.
+var PluginMap = map[string]plugin.Plugin{
+	PluginName: &Plugin{},
+}
+
+// Service defines the interface for kms plugins
+type Service interface {
+	Encrypt(payload, additionalData, URL, masterKey string) (string, string, int32, error)
+	Decrypt(payload, key, additionalData string, mode int, URL, masterKey string) (string, error)
+}
+
+// Plugin defines the implementation to serve/connect to a notifier plugin
+type Plugin struct {
+	plugin.Plugin
+	Impl Service
+}
+
+// GRPCServer defines the GRPC server implementation for this plugin
+func (p *Plugin) GRPCServer(broker *plugin.GRPCBroker, s *grpc.Server) error {
+	proto.RegisterKMSServer(s, &GRPCServer{
+		Impl: p.Impl,
+	})
+	return nil
+}
+
+// GRPCClient defines the GRPC client implementation for this plugin
+func (p *Plugin) GRPCClient(ctx context.Context, broker *plugin.GRPCBroker, c *grpc.ClientConn) (interface{}, error) {
+	return &GRPCClient{
+		client: proto.NewKMSClient(c),
+	}, nil
+}