dashboard: started with inmemory dashboard, wip

1 files changed, 132 insertions, 0 deletions

diff --git a/dashboard/dashboard.go b/dashboard/dashboard.go
new file mode 100644
index 0000000..9b6dedd
--- /dev/null
+++ b/dashboard/dashboard.go
@@ -0,0 +1,132 @@
+package dashboard
+
+import (
+	"bytes"
+	"crypto/ed25519"
+	"encoding/base32"
+	"encoding/json"
+
+	"kesim.org/seal"
+	"kesim.org/seal/nizk/commit"
+)
+
+type Dashboard interface {
+	NewAuction(description *seal.SignedDescription) (auctionId string, e error)
+	Auctions(state AuctionState) map[string]*seal.SignedDescription
+	Join(auctionId string, commitment SignedCommitment, bidderId ed25519.PublicKey) error
+	Commitments(auctionId string) (bidders map[string]SignedCommitment, e error)
+	Publish(auctionId string, round uint8, message SignedMessage, bidderId ed25519.PublicKey) error
+	Messages(auctionId string, round uint8) (messages map[string]SignedMessage, e error)
+	Cancel(auctionId string, reason SignedMessage, bidderId ed25519.PublicKey) error
+	Result(auctionId string) (price uint64, winner ed25519.PublicKey, e error)
+}
+
+type SignedMessage struct {
+	Message   []byte
+	Signature []byte
+}
+
+type SignedCommitment struct {
+	*commit.Commitment
+	Signature []byte
+}
+
+type Error int
+
+const (
+	ErrUnknownError Error = iota
+
+	ErrSellerIncorrectSignature
+	ErrSellerAuctionExists
+
+	ErrAuctionUnknown
+	ErrAuctionNotStarted
+	ErrAuctionNotReady
+	ErrAuctionNotRunning
+	ErrAuctionFinished
+	ErrAuctionCanceled
+	ErrAuctionTimeout
+
+	ErrBidderUnknown
+	ErrBidderTimeout
+	ErrBidderEmptyMessage
+	ErrBidderIncorrectSignature
+	ErrBidderWrongRound
+	ErrBidderVerificationFailed
+)
+
+func (d Error) Error() string {
+	switch d {
+	case ErrUnknownError:
+		return "unknown error"
+
+	case ErrSellerIncorrectSignature:
+		return "incorrect seller signature"
+	case ErrSellerAuctionExists:
+		return "auction with that id already exists"
+
+	case ErrAuctionUnknown:
+		return "unknown auction"
+	case ErrAuctionNotStarted:
+		return "auction not started yet"
+	case ErrAuctionNotReady:
+		return "auction not ready"
+	case ErrAuctionNotRunning:
+		return "auction is not running"
+	case ErrAuctionFinished:
+		return "auction is finished"
+	case ErrAuctionTimeout:
+		return "action has timed out"
+	case ErrAuctionCanceled:
+		return "auction has been canceled"
+
+	case ErrBidderUnknown:
+		return "bidder is unknown"
+	case ErrBidderTimeout:
+		return "bidder has timed out"
+	case ErrBidderEmptyMessage:
+		return "empty message"
+	case ErrBidderIncorrectSignature:
+		return "incorrect signature from bidder"
+	case ErrBidderWrongRound:
+		return "wrong round"
+	case ErrBidderVerificationFailed:
+		return "round data couldn't be verified"
+
+	default:
+		panic("should not happen")
+	}
+}
+
+type AuctionState int
+
+const (
+	AuctionStateUnknown AuctionState = iota
+
+	AuctionStateReady
+	AuctionStateRunning
+	AuctionStateFinished
+	AuctionStateCanceled
+	AuctionStateTimeout
+
+	AuctionStateLAST
+)
+
+func (s *SignedMessage) Verify(pubkey ed25519.PublicKey) bool {
+	return ed25519.Verify(pubkey, s.Message, s.Signature)
+}
+
+func (s *SignedCommitment) Verify(pubkey ed25519.PublicKey) bool {
+	buf := &bytes.Buffer{}
+	e := json.NewEncoder(buf).Encode(s.Commitment)
+	if e != nil {
+		// TODO: log message?
+		return false
+	}
+
+	return ed25519.Verify(pubkey, buf.Bytes(), s.Signature)
+}
+
+func Pub2String(pubkey ed25519.PublicKey) string {
+	return base32.StdEncoding.EncodeToString(pubkey)
+}
\ No newline at end of file