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 listPermissionsHandler struct {
    *handler
}

func (lph *listPermissionsHandler) List(ctx context.Context, req *charonrpc.ListPermissionsRequest) (*charonrpc.ListPermissionsResponse, error) {
    act, err := lph.Actor(ctx)
    if err != nil {
        return nil, err
    }
    if err = lph.firewall(req, act); err != nil {
        return nil, err
    }

    entities, err := lph.repository.permission.Find(ctx, &model.PermissionFindExpr{
        Offset:  req.Offset.Int64Or(0),
        Limit:   req.Limit.Int64Or(10),
        OrderBy: mapping.OrderBy(req.OrderBy),
        Where: &model.PermissionCriteria{
            Subsystem: req.Subsystem,
            Module:    req.Module,
            Action:    req.Action,
        },
    })
    if err != nil {
        return nil, grpcerr.E(codes.Internal, "find permission query failed", err)
    }

    permissions := make([]string, 0, len(entities))
    for _, e := range entities {
        permissions = append(permissions, e.Permission().String())
    }
    return &charonrpc.ListPermissionsResponse{
        Permissions: permissions,
    }, nil
}

func (lph *listPermissionsHandler) firewall(req *charonrpc.ListPermissionsRequest, act *session.Actor) error {
    if act.User.IsSuperuser {
        return nil
    }
    if act.Permissions.Contains(charon.PermissionCanRetrieve) {
        return nil
    }

    return grpcerr.E(codes.PermissionDenied, "list of permissions cannot be retrieved, missing permission")
}