feat: implement part of user service (#2053)

* feat: implement part of user service

* chore: update

* chore: update

api/v2/user_service.go

@@ -0,0 +1,73 @@
+package v2
+
+import (
+	"context"
+
+	apiv2pb "github.com/usememos/memos/proto/gen/api/v2"
+	"github.com/usememos/memos/store"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+type UserService struct {
+	apiv2pb.UnimplementedUserServiceServer
+
+	Store *store.Store
+}
+
+// NewUserService creates a new UserService.
+func NewUserService(store *store.Store) *UserService {
+	return &UserService{
+		Store: store,
+	}
+}
+
+func (s *UserService) GetUser(ctx context.Context, request *apiv2pb.GetUserRequest) (*apiv2pb.GetUserResponse, error) {
+	println("GetUser", request.Name)
+	user, err := s.Store.GetUser(ctx, &store.FindUser{
+		Username: &request.Name,
+	})
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "failed to list tags: %v", err)
+	}
+	if user == nil {
+		return nil, status.Errorf(codes.NotFound, "user not found")
+	}
+
+	userMessage := convertUserFromStore(user)
+	// Data desensitization.
+	userMessage.OpenId = ""
+
+	response := &apiv2pb.GetUserResponse{
+		User: userMessage,
+	}
+	return response, nil
+}
+
+func convertUserFromStore(user *store.User) *apiv2pb.User {
+	return &apiv2pb.User{
+		Id:        int32(user.ID),
+		RowStatus: convertRowStatusFromStore(user.RowStatus),
+		CreatedTs: user.CreatedTs,
+		UpdatedTs: user.UpdatedTs,
+		Username:  user.Username,
+		Role:      convertUserRoleFromStore(user.Role),
+		Email:     user.Email,
+		Nickname:  user.Nickname,
+		OpenId:    user.OpenID,
+		AvatarUrl: user.AvatarURL,
+	}
+}
+
+func convertUserRoleFromStore(role store.Role) apiv2pb.Role {
+	switch role {
+	case store.RoleHost:
+		return apiv2pb.Role_HOST
+	case store.RoleAdmin:
+		return apiv2pb.Role_ADMIN
+	case store.RoleUser:
+		return apiv2pb.Role_USER
+	default:
+		return apiv2pb.Role_ROLE_UNSPECIFIED
+	}
+}