chore: initial commit

internal/svc/auth/auth.go

@@ -0,0 +1,157 @@
+// Copyright (C) 2024 Declan Teevan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package auth
+
+import (
+	"context"
+
+	"github.com/bufbuild/protovalidate-go"
+	"github.com/rs/zerolog/log"
+	"google.golang.org/protobuf/types/known/emptypb"
+
+	"github.com/hexolan/stocklet/internal/pkg/errors"
+	"github.com/hexolan/stocklet/internal/pkg/gwauth"
+	"github.com/hexolan/stocklet/internal/pkg/messaging"
+	pb "github.com/hexolan/stocklet/internal/pkg/protogen/auth/v1"
+	commonpb "github.com/hexolan/stocklet/internal/pkg/protogen/common/v1"
+	eventpb "github.com/hexolan/stocklet/internal/pkg/protogen/events/v1"
+)
+
+// Interface for the service
+type AuthService struct {
+	pb.UnimplementedAuthServiceServer
+
+	cfg *ServiceConfig
+
+	store StorageController
+	pbVal *protovalidate.Validator
+}
+
+// Interface for database methods
+// Allows implementing seperate controllers for different databases (e.g. Postgres, MongoDB, etc)
+type StorageController interface {
+	SetPassword(ctx context.Context, userId string, password string) error
+	VerifyPassword(ctx context.Context, userId string, password string) (bool, error)
+
+	DeleteAuthMethods(ctx context.Context, userId string) error
+}
+
+// Interface for event consumption
+// Flexibility for seperate controllers for different messaging systems (e.g. Kafka, NATS, etc)
+type ConsumerController interface {
+	messaging.ConsumerController
+
+	Attach(svc pb.AuthServiceServer)
+}
+
+// Create the auth service
+func NewAuthService(cfg *ServiceConfig, store StorageController) *AuthService {
+	// Initialise the protobuf validator
+	pbVal, err := protovalidate.New()
+	if err != nil {
+		log.Panic().Err(err).Msg("failed to initialise protobuf validator")
+	}
+
+	svc := &AuthService{
+		cfg:   cfg,
+		store: store,
+		pbVal: pbVal,
+	}
+
+	return svc
+}
+
+func (svc AuthService) ServiceInfo(ctx context.Context, req *commonpb.ServiceInfoRequest) (*commonpb.ServiceInfoResponse, error) {
+	return &commonpb.ServiceInfoResponse{
+		Name:          "auth",
+		Source:        "https://github.com/hexolan/stocklet",
+		SourceLicense: "AGPL-3.0",
+	}, nil
+}
+
+func (svc AuthService) LoginPassword(ctx context.Context, req *pb.LoginPasswordRequest) (*pb.LoginPasswordResponse, error) {
+	// Validate the request args
+	if err := svc.pbVal.Validate(req); err != nil {
+		// provide validation err context to user
+		return nil, errors.NewServiceError(errors.ErrCodeInvalidArgument, "invalid request: "+err.Error())
+	}
+
+	// Verify password
+	match, err := svc.store.VerifyPassword(ctx, req.UserId, req.Password)
+	if err != nil || match == false {
+		return nil, errors.WrapServiceError(errors.ErrCodeForbidden, "invalid user id or password", err)
+	}
+
+	// Issue token for the user
+	token, err := issueToken(svc.cfg, req.UserId)
+	if err != nil {
+		return nil, errors.WrapServiceError(errors.ErrCodeService, "error issuing token", err)
+	}
+
+	return &pb.LoginPasswordResponse{Detail: "Success", Data: token}, nil
+}
+
+func (svc AuthService) SetPassword(ctx context.Context, req *pb.SetPasswordRequest) (*pb.SetPasswordResponse, error) {
+	// If the request is through the gateway,
+	// then perform permission checking
+	gatewayRequest, gwMd := gwauth.IsGatewayRequest(ctx)
+	if gatewayRequest {
+		log.Info().Msg("is a gateway request")
+		// Ensure user is authenticated
+		claims, err := gwauth.GetGatewayUser(gwMd)
+		if err != nil {
+			return nil, err
+		}
+
+		// Only allow changing of own password
+		req.UserId = claims.Subject
+	}
+
+	// Validate the request args
+	if err := svc.pbVal.Validate(req); err != nil {
+		// provide validation err context to user
+		return nil, errors.NewServiceError(errors.ErrCodeInvalidArgument, "invalid request: "+err.Error())
+	}
+
+	// Set the password
+	err := svc.store.SetPassword(ctx, req.UserId, req.Password)
+	if err != nil {
+		return nil, err
+	}
+
+	return &pb.SetPasswordResponse{Detail: "Successfully updated password"}, nil
+}
+
+func (svc AuthService) ProcessUserDeletedEvent(ctx context.Context, req *eventpb.UserDeletedEvent) (*emptypb.Empty, error) {
+	// Validate the request args
+	if err := svc.pbVal.Validate(req); err != nil {
+		// provide validation err context to user
+		return nil, errors.NewServiceError(errors.ErrCodeInvalidArgument, "invalid request: "+err.Error())
+	}
+
+	err := svc.store.DeleteAuthMethods(ctx, req.UserId)
+	if err != nil {
+		return nil, errors.WrapServiceError(errors.ErrCodeService, "failed to process event", err)
+	}
+
+	return &emptypb.Empty{}, nil
+}
+
+// Provide the JWK ECDSA public key as part of a JSON Web Key set.
+// This method is called by the API gateway for usage when validating inbound JWT tokens.
+func (svc AuthService) GetJwks(ctx context.Context, req *pb.GetJwksRequest) (*pb.GetJwksResponse, error) {
+	return &pb.GetJwksResponse{Keys: []*pb.PublicEcJWK{svc.cfg.ServiceOpts.PublicJwk}}, nil
+}