notifications: server implementation

notifications/genproto.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+SCRIPTDIR=$(dirname $0)
+
+protoc --go_out=$SCRIPTDIR --go_opt=paths=source_relative --go-grpc_out=$SCRIPTDIR --go-grpc_opt=paths=source_relative -I=$SCRIPTDIR $SCRIPTDIR/*.proto

notifications/notifications.pb.go

@@ -0,0 +1,218 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        v3.21.12
+// source: notifications.proto
+
+package notifications
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type SubscribeNotificationsRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Url       string `protobuf:"bytes,1,opt,name=url,proto3" json:"url,omitempty"`
+	Signature []byte `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
+}
+
+func (x *SubscribeNotificationsRequest) Reset() {
+	*x = SubscribeNotificationsRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_notifications_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SubscribeNotificationsRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SubscribeNotificationsRequest) ProtoMessage() {}
+
+func (x *SubscribeNotificationsRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_notifications_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SubscribeNotificationsRequest.ProtoReflect.Descriptor instead.
+func (*SubscribeNotificationsRequest) Descriptor() ([]byte, []int) {
+	return file_notifications_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *SubscribeNotificationsRequest) GetUrl() string {
+	if x != nil {
+		return x.Url
+	}
+	return ""
+}
+
+func (x *SubscribeNotificationsRequest) GetSignature() []byte {
+	if x != nil {
+		return x.Signature
+	}
+	return nil
+}
+
+type SubscribeNotificationsReply struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *SubscribeNotificationsReply) Reset() {
+	*x = SubscribeNotificationsReply{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_notifications_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SubscribeNotificationsReply) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SubscribeNotificationsReply) ProtoMessage() {}
+
+func (x *SubscribeNotificationsReply) ProtoReflect() protoreflect.Message {
+	mi := &file_notifications_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SubscribeNotificationsReply.ProtoReflect.Descriptor instead.
+func (*SubscribeNotificationsReply) Descriptor() ([]byte, []int) {
+	return file_notifications_proto_rawDescGZIP(), []int{1}
+}
+
+var File_notifications_proto protoreflect.FileDescriptor
+
+var file_notifications_proto_rawDesc = []byte{
+	0x0a, 0x13, 0x6e, 0x6f, 0x74, 0x69, 0x66, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x2e,
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+	0x6f, 0x6e, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_notifications_proto_rawDescOnce sync.Once
+	file_notifications_proto_rawDescData = file_notifications_proto_rawDesc
+)
+
+func file_notifications_proto_rawDescGZIP() []byte {
+	file_notifications_proto_rawDescOnce.Do(func() {
+		file_notifications_proto_rawDescData = protoimpl.X.CompressGZIP(file_notifications_proto_rawDescData)
+	})
+	return file_notifications_proto_rawDescData
+}
+
+var file_notifications_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_notifications_proto_goTypes = []interface{}{
+	(*SubscribeNotificationsRequest)(nil), // 0: notifications.SubscribeNotificationsRequest
+	(*SubscribeNotificationsReply)(nil),   // 1: notifications.SubscribeNotificationsReply
+}
+var file_notifications_proto_depIdxs = []int32{
+	0, // 0: notifications.Notifications.SubscribeNotifications:input_type -> notifications.SubscribeNotificationsRequest
+	1, // 1: notifications.Notifications.SubscribeNotifications:output_type -> notifications.SubscribeNotificationsReply
+	1, // [1:2] is the sub-list for method output_type
+	0, // [0:1] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_notifications_proto_init() }
+func file_notifications_proto_init() {
+	if File_notifications_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_notifications_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SubscribeNotificationsRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_notifications_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SubscribeNotificationsReply); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_notifications_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_notifications_proto_goTypes,
+		DependencyIndexes: file_notifications_proto_depIdxs,
+		MessageInfos:      file_notifications_proto_msgTypes,
+	}.Build()
+	File_notifications_proto = out.File
+	file_notifications_proto_rawDesc = nil
+	file_notifications_proto_goTypes = nil
+	file_notifications_proto_depIdxs = nil
+}

notifications/notifications.proto

@@ -0,0 +1,18 @@
+syntax = "proto3";
+
+option go_package = "github.com/breez/lspd/notifications";
+
+package notifications;
+
+service Notifications {
+    rpc SubscribeNotifications(SubscribeNotificationsRequest)
+        returns (SubscribeNotificationsReply) {}
+}  
+
+message SubscribeNotificationsRequest {
+    string url = 1;
+    bytes signature = 2;
+}
+
+message SubscribeNotificationsReply {
+}

notifications/notifications_grpc.pb.go

@@ -0,0 +1,105 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             v3.21.12
+// source: notifications.proto
+
+package notifications
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// NotificationsClient is the client API for Notifications service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type NotificationsClient interface {
+	SubscribeNotifications(ctx context.Context, in *SubscribeNotificationsRequest, opts ...grpc.CallOption) (*SubscribeNotificationsReply, error)
+}
+
+type notificationsClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewNotificationsClient(cc grpc.ClientConnInterface) NotificationsClient {
+	return &notificationsClient{cc}
+}
+
+func (c *notificationsClient) SubscribeNotifications(ctx context.Context, in *SubscribeNotificationsRequest, opts ...grpc.CallOption) (*SubscribeNotificationsReply, error) {
+	out := new(SubscribeNotificationsReply)
+	err := c.cc.Invoke(ctx, "/notifications.Notifications/SubscribeNotifications", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// NotificationsServer is the server API for Notifications service.
+// All implementations must embed UnimplementedNotificationsServer
+// for forward compatibility
+type NotificationsServer interface {
+	SubscribeNotifications(context.Context, *SubscribeNotificationsRequest) (*SubscribeNotificationsReply, error)
+	mustEmbedUnimplementedNotificationsServer()
+}
+
+// UnimplementedNotificationsServer must be embedded to have forward compatible implementations.
+type UnimplementedNotificationsServer struct {
+}
+
+func (UnimplementedNotificationsServer) SubscribeNotifications(context.Context, *SubscribeNotificationsRequest) (*SubscribeNotificationsReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SubscribeNotifications not implemented")
+}
+func (UnimplementedNotificationsServer) mustEmbedUnimplementedNotificationsServer() {}
+
+// UnsafeNotificationsServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to NotificationsServer will
+// result in compilation errors.
+type UnsafeNotificationsServer interface {
+	mustEmbedUnimplementedNotificationsServer()
+}
+
+func RegisterNotificationsServer(s grpc.ServiceRegistrar, srv NotificationsServer) {
+	s.RegisterService(&Notifications_ServiceDesc, srv)
+}
+
+func _Notifications_SubscribeNotifications_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SubscribeNotificationsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(NotificationsServer).SubscribeNotifications(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/notifications.Notifications/SubscribeNotifications",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(NotificationsServer).SubscribeNotifications(ctx, req.(*SubscribeNotificationsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// Notifications_ServiceDesc is the grpc.ServiceDesc for Notifications service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var Notifications_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "notifications.Notifications",
+	HandlerType: (*NotificationsServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "SubscribeNotifications",
+			Handler:    _Notifications_SubscribeNotifications_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "notifications.proto",
+}

notifications/server.go

@@ -0,0 +1,58 @@
+package notifications
+
+import (
+	context "context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"log"
+
+	"github.com/btcsuite/btcd/btcec/v2/ecdsa"
+)
+
+var ErrInvalidSignature = fmt.Errorf("invalid signature")
+var ErrInternal = fmt.Errorf("internal error")
+
+type server struct {
+	store Store
+	NotificationsServer
+}
+
+func NewNotificationsServer(store Store) NotificationsServer {
+	return &server{
+		store: store,
+	}
+}
+
+func (s *server) SubscribeNotifications(
+	ctx context.Context,
+	request *SubscribeNotificationsRequest,
+) (*SubscribeNotificationsReply, error) {
+	first := sha256.Sum256([]byte(request.Url))
+	second := sha256.Sum256(first[:])
+	pubkey, wasCompressed, err := ecdsa.RecoverCompact(
+		request.Signature,
+		second[:],
+	)
+	if err != nil {
+		return nil, ErrInvalidSignature
+	}
+
+	if !wasCompressed {
+		return nil, ErrInvalidSignature
+	}
+
+	err = s.store.Register(ctx, hex.EncodeToString(pubkey.SerializeCompressed()), request.Url)
+	if err != nil {
+		log.Printf(
+			"failed to register %x for notifications on url %s: %v",
+			pubkey.SerializeCompressed(),
+			request.Url,
+			err,
+		)
+
+		return nil, ErrInternal
+	}
+
+	return &SubscribeNotificationsReply{}, nil
+}

notifications/store.go

@@ -0,0 +1,10 @@
+package notifications
+
+import (
+	"context"
+)
+
+type Store interface {
+	Register(ctx context.Context, pubkey string, url string) error
+	GetRegistrations(ctx context.Context, pubkey string) ([]string, error)
+}