piotrkowalczuk/charon

package charond

import (
    "context"

    "github.com/golang/protobuf/ptypes/wrappers"
    "github.com/piotrkowalczuk/charon"
    charonrpc "github.com/piotrkowalczuk/charon/pb/rpc/charond/v1"
    "github.com/piotrkowalczuk/charon/internal/grpcerr"
    "github.com/piotrkowalczuk/charon/internal/model"
    "github.com/piotrkowalczuk/charon/internal/session"
    "google.golang.org/grpc/codes"
)

type deleteGroupHandler struct {
    *handler
}

func (dgh *deleteGroupHandler) Delete(ctx context.Context, req *charonrpc.DeleteGroupRequest) (*wrappers.BoolValue, error) {
    if req.Id <= 0 {
        return nil, grpcerr.E(codes.InvalidArgument, "group cannot be deleted, invalid id")
    }

    act, err := dgh.Actor(ctx)
    if err != nil {
        return nil, err
    }
    if err = dgh.firewall(req, act); err != nil {
        return nil, err
    }

    aff, err := dgh.repository.group.DeleteOneByID(ctx, req.Id)
    if err != nil {
        //if err == sql.ErrNoRows {
        //    return nil, grpcerr.E(codes.NotFound, "group deletion failure", err)
        //}
        switch model.ErrorConstraint(err) {
        case model.TableUserGroupsConstraintGroupIDForeignKey:
            return nil, grpcerr.E(codes.FailedPrecondition, "group cannot be removed, users are assigned to it")
        case model.TableGroupPermissionsConstraintGroupIDForeignKey:
            return nil, grpcerr.E(codes.FailedPrecondition, "group cannot be removed, permissions are assigned to it")
        default:
            return nil, grpcerr.E(codes.Internal, "group deletion failure", err)
        }
    }

    if aff == 0 {
        return nil, grpcerr.E(codes.NotFound, "group cannot be removed, does not exists")
    }

    return &wrappers.BoolValue{
        Value: aff > 0,
    }, nil
}

func (dgh *deleteGroupHandler) firewall(req *charonrpc.DeleteGroupRequest, act *session.Actor) error {
    if act.User.IsSuperuser {
        return nil
    }
    if act.Permissions.Contains(charon.GroupCanDelete) {
        return nil
    }

    return grpcerr.E(codes.PermissionDenied, "group cannot be removed, missing permission")
}