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package proxy
import (
"github.com/tendermint/go-wire/data"
"github.com/tendermint/tendermint/lite"
certclient "github.com/tendermint/tendermint/lite/client"
rpcclient "github.com/tendermint/tendermint/rpc/client"
ctypes "github.com/tendermint/tendermint/rpc/core/types"
)
var _ rpcclient.Client = Wrapper{}
// Wrapper wraps a rpcclient with a Certifier and double-checks any input that is
// provable before passing it along. Allows you to make any rpcclient fully secure.
type Wrapper struct {
rpcclient.Client
cert *lite.InquiringCertifier
}
// SecureClient uses a given certifier to wrap an connection to an untrusted
// host and return a cryptographically secure rpc client.
//
// If it is wrapping an HTTP rpcclient, it will also wrap the websocket interface
func SecureClient(c rpcclient.Client, cert *lite.InquiringCertifier) Wrapper {
wrap := Wrapper{c, cert}
// TODO: no longer possible as no more such interface exposed....
// if we wrap http client, then we can swap out the event switch to filter
// if hc, ok := c.(*rpcclient.HTTP); ok {
// evt := hc.WSEvents.EventSwitch
// hc.WSEvents.EventSwitch = WrappedSwitch{evt, wrap}
// }
return wrap
}
// ABCIQueryWithOptions exposes all options for the ABCI query and verifies the returned proof
func (w Wrapper) ABCIQueryWithOptions(path string, data data.Bytes,
opts rpcclient.ABCIQueryOptions) (*ctypes.ResultABCIQuery, error) {
res, _, err := GetWithProofOptions(path, data, opts, w.Client, w.cert)
return res, err
}
// ABCIQuery uses default options for the ABCI query and verifies the returned proof
func (w Wrapper) ABCIQuery(path string, data data.Bytes) (*ctypes.ResultABCIQuery, error) {
return w.ABCIQueryWithOptions(path, data, rpcclient.DefaultABCIQueryOptions)
}
// Tx queries for a given tx and verifies the proof if it was requested
func (w Wrapper) Tx(hash []byte, prove bool) (*ctypes.ResultTx, error) {
res, err := w.Client.Tx(hash, prove)
if !prove || err != nil {
return res, err
}
h := int64(res.Height)
check, err := GetCertifiedCommit(h, w.Client, w.cert)
if err != nil {
return res, err
}
err = res.Proof.Validate(check.Header.DataHash)
return res, err
}
// BlockchainInfo requests a list of headers and verifies them all...
// Rather expensive.
//
// TODO: optimize this if used for anything needing performance
func (w Wrapper) BlockchainInfo(minHeight, maxHeight int64) (*ctypes.ResultBlockchainInfo, error) {
r, err := w.Client.BlockchainInfo(minHeight, maxHeight)
if err != nil {
return nil, err
}
// go and verify every blockmeta in the result....
for _, meta := range r.BlockMetas {
// get a checkpoint to verify from
c, err := w.Commit(&meta.Header.Height)
if err != nil {
return nil, err
}
check := certclient.CommitFromResult(c)
err = ValidateBlockMeta(meta, check)
if err != nil {
return nil, err
}
}
return r, nil
}
// Block returns an entire block and verifies all signatures
func (w Wrapper) Block(height *int64) (*ctypes.ResultBlock, error) {
r, err := w.Client.Block(height)
if err != nil {
return nil, err
}
// get a checkpoint to verify from
c, err := w.Commit(height)
if err != nil {
return nil, err
}
check := certclient.CommitFromResult(c)
// now verify
err = ValidateBlockMeta(r.BlockMeta, check)
if err != nil {
return nil, err
}
err = ValidateBlock(r.Block, check)
if err != nil {
return nil, err
}
return r, nil
}
// Commit downloads the Commit and certifies it with the lite.
//
// This is the foundation for all other verification in this module
func (w Wrapper) Commit(height *int64) (*ctypes.ResultCommit, error) {
rpcclient.WaitForHeight(w.Client, *height, nil)
r, err := w.Client.Commit(height)
// if we got it, then certify it
if err == nil {
check := certclient.CommitFromResult(r)
err = w.cert.Certify(check)
}
return r, err
}
// // WrappedSwitch creates a websocket connection that auto-verifies any info
// // coming through before passing it along.
// //
// // Since the verification takes 1-2 rpc calls, this is obviously only for
// // relatively low-throughput situations that can tolerate a bit extra latency
// type WrappedSwitch struct {
// types.EventSwitch
// client rpcclient.Client
// }
// // FireEvent verifies any block or header returned from the eventswitch
// func (s WrappedSwitch) FireEvent(event string, data events.EventData) {
// tm, ok := data.(types.TMEventData)
// if !ok {
// fmt.Printf("bad type %#v\n", data)
// return
// }
// // check to validate it if possible, and drop if not valid
// switch t := tm.Unwrap().(type) {
// case types.EventDataNewBlockHeader:
// err := verifyHeader(s.client, t.Header)
// if err != nil {
// fmt.Printf("Invalid header: %#v\n", err)
// return
// }
// case types.EventDataNewBlock:
// err := verifyBlock(s.client, t.Block)
// if err != nil {
// fmt.Printf("Invalid block: %#v\n", err)
// return
// }
// // TODO: can we verify tx as well? anything else
// }
// // looks good, we fire it
// s.EventSwitch.FireEvent(event, data)
// }
// func verifyHeader(c rpcclient.Client, head *types.Header) error {
// // get a checkpoint to verify from
// commit, err := c.Commit(&head.Height)
// if err != nil {
// return err
// }
// check := certclient.CommitFromResult(commit)
// return ValidateHeader(head, check)
// }
//
// func verifyBlock(c rpcclient.Client, block *types.Block) error {
// // get a checkpoint to verify from
// commit, err := c.Commit(&block.Height)
// if err != nil {
// return err
// }
// check := certclient.CommitFromResult(commit)
// return ValidateBlock(block, check)
// }