// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package feeds
import (
"bytes"
"encoding/binary"
"encoding/json"
"fmt"
"reflect"
"testing"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/swarm/storage"
"github.com/ethereum/go-ethereum/swarm/storage/feeds/lookup"
)
func areEqualJSON(s1, s2 string) (bool, error) {
//credit for the trick: turtlemonvh https://gist.github.com/turtlemonvh/e4f7404e28387fadb8ad275a99596f67
var o1 interface{}
var o2 interface{}
err := json.Unmarshal([]byte(s1), &o1)
if err != nil {
return false, fmt.Errorf("Error mashalling string 1 :: %s", err.Error())
}
err = json.Unmarshal([]byte(s2), &o2)
if err != nil {
return false, fmt.Errorf("Error mashalling string 2 :: %s", err.Error())
}
return reflect.DeepEqual(o1, o2), nil
}
// TestEncodingDecodingUpdateRequests ensures that requests are serialized properly
// while also checking cryptographically that only the owner of a feed can update it.
func TestEncodingDecodingUpdateRequests(t *testing.T) {
charlie := newCharlieSigner() //Charlie
bob := newBobSigner() //Bob
// Create a feed to our good guy Charlie's name
topic, _ := NewTopic("a good topic name", nil)
firstRequest := NewFirstRequest(topic)
firstRequest.User = charlie.Address()
// We now encode the create message to simulate we send it over the wire
messageRawData, err := firstRequest.MarshalJSON()
if err != nil {
t.Fatalf("Error encoding first feed update request: %s", err)
}
// ... the message arrives and is decoded...
var recoveredFirstRequest Request
if err := recoveredFirstRequest.UnmarshalJSON(messageRawData); err != nil {
t.Fatalf("Error decoding first feed update request: %s", err)
}
// ... but verification should fail because it is not signed!
if err := recoveredFirstRequest.Verify(); err == nil {
t.Fatal("Expected Verify to fail since the message is not signed")
}
// We now assume that the feed ypdate was created and propagated.
const expectedSignature = "0x7235b27a68372ddebcf78eba48543fa460864b0b0e99cb533fcd3664820e603312d29426dd00fb39628f5299480a69bf6e462838d78de49ce0704c754c9deb2601"
const expectedJSON = `{"feed":{"topic":"0x6120676f6f6420746f706963206e616d65000000000000000000000000000000","user":"0x876a8936a7cd0b79ef0735ad0896c1afe278781c"},"epoch":{"time":1000,"level":1},"protocolVersion":0,"data":"0x5468697320686f75722773207570646174653a20537761726d2039392e3020686173206265656e2072656c656173656421"}`
//Put together an unsigned update request that we will serialize to send it to the signer.
data := []byte("This hour's update: Swarm 99.0 has been released!")
request := &Request{
Update: Update{
ID: ID{
Epoch: lookup.Epoch{
Time: 1000,
Level: 1,
},
Feed: firstRequest.Update.Feed,
},
data: data,
},
}
messageRawData, err = request.MarshalJSON()
if err != nil {
t.Fatalf("Error encoding update request: %s", err)
}
equalJSON, err := areEqualJSON(string(messageRawData), expectedJSON)
if err != nil {
t.Fatalf("Error decoding update request JSON: %s", err)
}
if !equalJSON {
t.Fatalf("Received a different JSON message. Expected %s, got %s", expectedJSON, string(messageRawData))
}
// now the encoded message messageRawData is sent over the wire and arrives to the signer
//Attempt to extract an UpdateRequest out of the encoded message
var recoveredRequest Request
if err := recoveredRequest.UnmarshalJSON(messageRawData); err != nil {
t.Fatalf("Error decoding update request: %s", err)
}
//sign the request and see if it matches our predefined signature above.
if err := recoveredRequest.Sign(charlie); err != nil {
t.Fatalf("Error signing request: %s", err)
}
compareByteSliceToExpectedHex(t, "signature", recoveredRequest.Signature[:], expectedSignature)
// mess with the signature and see what happens. To alter the signature, we briefly decode it as JSON
// to alter the signature field.
var j updateRequestJSON
if err := json.Unmarshal([]byte(expectedJSON), &j); err != nil {
t.Fatal("Error unmarshalling test json, check expectedJSON constant")
}
j.Signature = "Certainly not a signature"
corruptMessage, _ := json.Marshal(j) // encode the message with the bad signature
var corruptRequest Request
if err = corruptRequest.UnmarshalJSON(corruptMessage); err == nil {
t.Fatal("Expected DecodeUpdateRequest to fail when trying to interpret a corrupt message with an invalid signature")
}
// Now imagine Bob wants to create an update of his own about the same feed,
// signing a message with his private key
if err := request.Sign(bob); err != nil {
t.Fatalf("Error signing: %s", err)
}
// Now Bob encodes the message to send it over the wire...
messageRawData, err = request.MarshalJSON()
if err != nil {
t.Fatalf("Error encoding message:%s", err)
}
// ... the message arrives to our Swarm node and it is decoded.
recoveredRequest = Request{}
if err := recoveredRequest.UnmarshalJSON(messageRawData); err != nil {
t.Fatalf("Error decoding message:%s", err)
}
// Before checking what happened with Bob's update, let's see what would happen if we mess
// with the signature big time to see if Verify catches it
savedSignature := *recoveredRequest.Signature // save the signature for later
binary.LittleEndian.PutUint64(recoveredRequest.Signature[5:], 556845463424) // write some random data to break the signature
if err = recoveredRequest.Verify(); err == nil {
t.Fatal("Expected Verify to fail on corrupt signature")
}
// restore the Bob's signature from corruption
*recoveredRequest.Signature = savedSignature
// Now the signature is not corrupt
if err = recoveredRequest.Verify(); err != nil {
t.Fatal(err)
}
// Reuse object and sign with our friend Charlie's private key
if err := recoveredRequest.Sign(charlie); err != nil {
t.Fatalf("Error signing with the correct private key: %s", err)
}
// And now, Verify should work since this update now belongs to Charlie
if err = recoveredRequest.Verify(); err != nil {
t.Fatalf("Error verifying that Charlie, can sign a reused request object:%s", err)
}
// mess with the lookup key to make sure Verify fails:
recoveredRequest.Time = 77999 // this will alter the lookup key
if err = recoveredRequest.Verify(); err == nil {
t.Fatalf("Expected Verify to fail since the lookup key has been altered")
}
}
func getTestRequest() *Request {
return &Request{
Update: *getTestFeedUpdate(),
}
}
func TestUpdateChunkSerializationErrorChecking(t *testing.T) {
// Test that parseUpdate fails if the chunk is too small
var r Request
if err := r.fromChunk(storage.ZeroAddr, make([]byte, minimumUpdateDataLength-1+signatureLength)); err == nil {
t.Fatalf("Expected request.fromChunk to fail when chunkData contains less than %d bytes", minimumUpdateDataLength)
}
r = *getTestRequest()
_, err := r.toChunk()
if err == nil {
t.Fatal("Expected request.toChunk to fail when there is no data")
}
r.data = []byte("Al bien hacer jamás le falta premio") // put some arbitrary length data
_, err = r.toChunk()
if err == nil {
t.Fatal("expected request.toChunk to fail when there is no signature")
}
charlie := newCharlieSigner()
if err := r.Sign(charlie); err != nil {
t.Fatalf("error signing:%s", err)
}
chunk, err := r.toChunk()
if err != nil {
t.Fatalf("error creating update chunk:%s", err)
}
compareByteSliceToExpectedHex(t, "chunk", chunk.Data(), "0x0000000000000000776f726c64206e657773207265706f72742c20657665727920686f7572000000876a8936a7cd0b79ef0735ad0896c1afe278781ce803000000000019416c206269656e206861636572206a616dc3a173206c652066616c7461207072656d696f5a0ffe0bc27f207cd5b00944c8b9cee93e08b89b5ada777f123ac535189333f174a6a4ca2f43a92c4a477a49d774813c36ce8288552c58e6205b0ac35d0507eb00")
var recovered Request
recovered.fromChunk(chunk.Address(), chunk.Data())
if !reflect.DeepEqual(recovered, r) {
t.Fatal("Expected recovered feed update request to equal the original one")
}
}
// check that signature address matches update signer address
func TestReverse(t *testing.T) {
epoch := lookup.Epoch{
Time: 7888,
Level: 6,
}
// make fake timeProvider
timeProvider := &fakeTimeProvider{
currentTime: startTime.Time,
}
// signer containing private key
signer := newAliceSigner()
// set up rpc and create feeds handler
_, _, teardownTest, err := setupTest(timeProvider, signer)
if err != nil {
t.Fatal(err)
}
defer teardownTest()
topic, _ := NewTopic("Cervantes quotes", nil)
feed := Feed{
Topic: topic,
User: signer.Address(),
}
data := []byte("Donde una puerta se cierra, otra se abre")
request := new(Request)
request.Feed = feed
request.Epoch = epoch
request.data = data
// generate a chunk key for this request
key := request.Addr()
if err = request.Sign(signer); err != nil {
t.Fatal(err)
}
chunk, err := request.toChunk()
if err != nil {
t.Fatal(err)
}
// check that we can recover the owner account from the update chunk's signature
var checkUpdate Request
if err := checkUpdate.fromChunk(chunk.Address(), chunk.Data()); err != nil {
t.Fatal(err)
}
checkdigest, err := checkUpdate.GetDigest()
if err != nil {
t.Fatal(err)
}
recoveredAddr, err := getUserAddr(checkdigest, *checkUpdate.Signature)
if err != nil {
t.Fatalf("Retrieve address from signature fail: %v", err)
}
originalAddr := crypto.PubkeyToAddress(signer.PrivKey.PublicKey)
// check that the metadata retrieved from the chunk matches what we gave it
if recoveredAddr != originalAddr {
t.Fatalf("addresses dont match: %x != %x", originalAddr, recoveredAddr)
}
if !bytes.Equal(key[:], chunk.Address()[:]) {
t.Fatalf("Expected chunk key '%x', was '%x'", key, chunk.Address())
}
if epoch != checkUpdate.Epoch {
t.Fatalf("Expected epoch to be '%s', was '%s'", epoch.String(), checkUpdate.Epoch.String())
}
if !bytes.Equal(data, checkUpdate.data) {
t.Fatalf("Expected data '%x', was '%x'", data, checkUpdate.data)
}
}
