71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
package stack
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import (
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crypto "github.com/tendermint/go-crypto"
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"github.com/tendermint/basecoin"
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"github.com/tendermint/basecoin/errors"
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"github.com/tendermint/basecoin/types"
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)
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// app name for auth
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const (
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NameSigs = "sigs"
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)
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type Signatures struct {
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PassOption
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}
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func (_ Signatures) Name() string {
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return NameSigs
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}
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var _ Middleware = Signatures{}
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func SigPerm(addr []byte) basecoin.Actor {
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return basecoin.NewActor(NameSigs, addr)
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}
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// Signed allows us to use txs.OneSig and txs.MultiSig (and others??)
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type Signed interface {
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basecoin.TxLayer
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Signers() ([]crypto.PubKey, error)
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}
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func (h Signatures) CheckTx(ctx basecoin.Context, store types.KVStore, tx basecoin.Tx, next basecoin.Checker) (res basecoin.Result, err error) {
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sigs, tnext, err := getSigners(tx)
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if err != nil {
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return res, err
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}
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ctx2 := addSigners(ctx, sigs)
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return next.CheckTx(ctx2, store, tnext)
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}
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func (h Signatures) DeliverTx(ctx basecoin.Context, store types.KVStore, tx basecoin.Tx, next basecoin.Deliver) (res basecoin.Result, err error) {
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sigs, tnext, err := getSigners(tx)
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if err != nil {
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return res, err
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}
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ctx2 := addSigners(ctx, sigs)
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return next.DeliverTx(ctx2, store, tnext)
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}
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func addSigners(ctx basecoin.Context, sigs []crypto.PubKey) basecoin.Context {
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perms := make([]basecoin.Actor, len(sigs))
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for i, s := range sigs {
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perms[i] = SigPerm(s.Address())
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}
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// add the signers to the context and continue
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return ctx.WithPermissions(perms...)
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}
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func getSigners(tx basecoin.Tx) ([]crypto.PubKey, basecoin.Tx, error) {
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stx, ok := tx.Unwrap().(Signed)
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if !ok {
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return nil, basecoin.Tx{}, errors.ErrUnauthorized()
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}
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sig, err := stx.Signers()
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return sig, stx.Next(), err
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}
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