shitlang.go

package feed

import ("fmt"
	"encoding/json"
	"reflect"

	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/swarm/storage/feed"
	"github.com/ethereum/go-ethereum/swarm/storage/feed/lookup")

func newBobSigner() *GenericSigner {
	privKey, _ := crypto.HexToECDSA("accedeaccedeaccedeaccedeaccedeaccedeaccedeaccedeaccedeaccedecaca")
	return NewGenericSigner(privKey)
}

func newCharlieSigner() *GenericSigner {
	privKey, _ := crypto.HexToECDSA("facadefacadefacadefacadefacadefacadefacadefacadefacadefacadefaca")
	return NewGenericSigner(privKey)
}

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() {

	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()


	// ... the message arrives and is decoded...
	var recoveredFirstRequest Request


	// 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()

	equalJSON, err := areEqualJSON(string(messageRawData), expectedJSON)
	// 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


	//sign the request and see if it matches our predefined signature above.
}

func main() {
	fmt.Println("Hello, world.")
	TestEncodingDecodingUpdateRequests()
	fmt.Println("Hello, world.")
}