136 lines
3.1 KiB
Go
136 lines
3.1 KiB
Go
package stack
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import (
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"bytes"
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"math/rand"
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"github.com/pkg/errors"
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"github.com/tendermint/tmlibs/log"
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"github.com/tendermint/basecoin"
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"github.com/tendermint/basecoin/types"
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)
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// store nonce as it's own type so no one can even try to fake it
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type nonce int64
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type secureContext struct {
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id nonce
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chain string
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app string
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perms []basecoin.Actor
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log.Logger
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}
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func NewContext(chain string, logger log.Logger) basecoin.Context {
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return secureContext{
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id: nonce(rand.Int63()),
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chain: chain,
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Logger: logger,
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}
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}
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var _ basecoin.Context = secureContext{}
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func (c secureContext) ChainID() string {
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return c.chain
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}
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// WithPermissions will panic if they try to set permission without the proper app
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func (c secureContext) WithPermissions(perms ...basecoin.Actor) basecoin.Context {
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// the guard makes sure you only set permissions for the app you are inside
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for _, p := range perms {
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// TODO: also check chainID, limit only certain middleware can set IBC?
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if p.App != c.app {
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err := errors.Errorf("Cannot set permission for %s from %s", c.app, p.App)
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panic(err)
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}
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}
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return secureContext{
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id: c.id,
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chain: c.chain,
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app: c.app,
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perms: append(c.perms, perms...),
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Logger: c.Logger,
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}
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}
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func (c secureContext) HasPermission(perm basecoin.Actor) bool {
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for _, p := range c.perms {
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if perm.App == p.App && bytes.Equal(perm.Address, p.Address) {
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return true
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}
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}
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return false
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}
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func (c secureContext) GetPermissions(chain, app string) (res []basecoin.Actor) {
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for _, p := range c.perms {
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if chain == p.ChainID {
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if app == "" || app == p.App {
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res = append(res, p)
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}
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}
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}
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return res
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}
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// IsParent ensures that this is derived from the given secureClient
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func (c secureContext) IsParent(other basecoin.Context) bool {
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so, ok := other.(secureContext)
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if !ok {
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return false
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}
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return c.id == so.id
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}
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// Reset should clear out all permissions,
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// but carry on knowledge that this is a child
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func (c secureContext) Reset() basecoin.Context {
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return secureContext{
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id: c.id,
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chain: c.chain,
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app: c.app,
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perms: nil,
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Logger: c.Logger,
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}
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}
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// withApp is a private method that we can use to properly set the
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// app controls in the middleware
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func withApp(ctx basecoin.Context, app string) basecoin.Context {
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sc, ok := ctx.(secureContext)
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if !ok {
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return ctx
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}
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return secureContext{
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id: sc.id,
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chain: sc.chain,
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app: app,
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perms: sc.perms,
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Logger: sc.Logger,
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}
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}
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func secureCheck(h basecoin.Checker, parent basecoin.Context) basecoin.Checker {
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next := func(ctx basecoin.Context, store types.KVStore, tx basecoin.Tx) (res basecoin.Result, err error) {
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if !parent.IsParent(ctx) {
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return res, errors.New("Passing in non-child Context")
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}
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return h.CheckTx(ctx, store, tx)
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}
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return basecoin.CheckerFunc(next)
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}
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func secureDeliver(h basecoin.Deliver, parent basecoin.Context) basecoin.Deliver {
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next := func(ctx basecoin.Context, store types.KVStore, tx basecoin.Tx) (res basecoin.Result, err error) {
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if !parent.IsParent(ctx) {
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return res, errors.New("Passing in non-child Context")
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}
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return h.DeliverTx(ctx, store, tx)
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}
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return basecoin.DeliverFunc(next)
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}
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