piotrkowalczuk/charon

package charond

import (
    "context"

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

type createGroupHandler struct {
    *handler
}

func (cgh *createGroupHandler) Create(ctx context.Context, req *charonrpc.CreateGroupRequest) (*charonrpc.CreateGroupResponse, error) {
    if len(req.Name) < 3 {
        return nil, grpcerr.E(codes.InvalidArgument, "group name is required and needs to be at least 3 characters long")
    }
    act, err := cgh.Actor(ctx)
    if err != nil {
        return nil, err
    }
    if err = cgh.firewall(req, act); err != nil {
        return nil, err
    }

    ent, err := cgh.repository.group.Create(ctx, act.User.ID, req.Name, req.Description)
    if err != nil {
        switch model.ErrorConstraint(err) {
        case model.TableGroupConstraintNameUnique:
            return nil, grpcerr.E(codes.AlreadyExists, "group with given name already exists")
        default:
            return nil, grpcerr.E(codes.Internal, "group fetch failure", err)
        }
    }

    return cgh.response(ent)
}

func (cgh *createGroupHandler) firewall(req *charonrpc.CreateGroupRequest, act *session.Actor) error {
    if act.User.IsSuperuser {
        return nil
    }
    if act.Permissions.Contains(charon.GroupCanCreate) {
        return nil
    }

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

func (cgh *createGroupHandler) response(ent *model.GroupEntity) (*charonrpc.CreateGroupResponse, error) {
    msg, err := mapping.ReverseGroup(ent)
    if err != nil {
        return nil, grpcerr.E(codes.Internal, "group entity mapping failure", err)
    }
    return &charonrpc.CreateGroupResponse{Group: msg}, nil
}