piotrkowalczuk/charon

package charond

import (
    "time"

    "github.com/golang/protobuf/ptypes"
    "github.com/lib/pq"
    "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/refreshtoken"
    "github.com/piotrkowalczuk/charon/internal/session"
    "github.com/piotrkowalczuk/ntypes"
    "golang.org/x/net/context"
    "google.golang.org/grpc/codes"
)

type createRefreshTokenHandler struct {
    *handler
}

func (crth *createRefreshTokenHandler) Create(ctx context.Context, req *charonrpc.CreateRefreshTokenRequest) (*charonrpc.CreateRefreshTokenResponse, error) {
    var (
        expireAt time.Time
        err      error
    )
    if req.ExpireAt != nil {
        if expireAt, err = ptypes.Timestamp(req.ExpireAt); err != nil {
            return nil, grpcerr.E(codes.InvalidArgument, "invalid format of expire at", err)
        }
    }

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

    tkn, err := refreshtoken.Random()
    if err != nil {
        return nil, grpcerr.E(codes.Internal, "refresh token generation failure", err)
    }

    ent, err := crth.repository.refreshToken.Create(ctx, &model.RefreshTokenEntity{
        UserID: act.User.ID,
        Token:  tkn,
        ExpireAt: pq.NullTime{
            Time:  expireAt.UTC(),
            Valid: !expireAt.IsZero(),
        },
        CreatedBy: ntypes.Int64{Int64: act.User.ID, Valid: true},
        Notes:     allocNilString(req.Notes),
    })
    if err != nil {
        switch model.ErrorConstraint(err) {
        case model.TableRefreshTokenConstraintCreatedByForeignKey:
            return nil, grpcerr.E(codes.NotFound, "such user does not exist")
        case model.TableRefreshTokenConstraintTokenUnique:
            return nil, grpcerr.E(codes.AlreadyExists, "such refresh token already exists")
        case model.TableRefreshTokenConstraintUserIDForeignKey:
            return nil, grpcerr.E(codes.NotFound, "such user does not exist")
        default:
            return nil, grpcerr.E(codes.Internal, "refresh token persistence failure", err)
        }
    }

    return crth.response(ent)
}

func (crth *createRefreshTokenHandler) firewall(req *charonrpc.CreateRefreshTokenRequest, act *session.Actor) error {
    if act.User.IsSuperuser {
        return nil
    }
    if act.Permissions.Contains(charon.RefreshTokenCanCreate) {
        return nil
    }

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

func (crth *createRefreshTokenHandler) response(ent *model.RefreshTokenEntity) (*charonrpc.CreateRefreshTokenResponse, error) {
    msg, err := mapping.ReverseRefreshToken(ent)
    if err != nil {
        return nil, grpcerr.E(codes.Internal, "refresh token entity mapping failure", err)
    }
    return &charonrpc.CreateRefreshTokenResponse{
        RefreshToken: msg,
    }, nil
}