func updateTransaction(c appengine.Context, r *http.Request, txId string, txKey *datastore.Key) error {
now := time.Now()
r.ParseForm()
values := make(map[string]string)
// Check that we don't have any multi-occurring parameters,
// copy into a simple key value map for easier handling
for k, v := range r.Form {
if len(v) == 1 {
values[k] = v[0]
} else if len(v) > 1 {
return fmt.Errorf("Multiple occurrences of argument %#v", k)
}
}
// Verify "txid" parameter, add if not found
if txId2, ok := values["txid"]; ok {
if txId2 != txId {
return fmt.Errorf("Transaction ID parameter doesn't match %#v", txId)
}
} else {
values["txid"] = txId
}
// Filter out "signature" parameter
var signature string
if _signature, ok := values["signature"]; ok {
delete(values, "signature")
signature = _signature
} else {
return fmt.Errorf("Missing signature parameter in message")
}
// Filter out "address" parameter
var address string
if _address, ok := values["address"]; ok {
delete(values, "address")
address = _address
} else {
return fmt.Errorf("Missing address parameter in message")
}
document := makeDocument(values)
if CfgRequireValidSignature {
if err := bitcoin.VerifySignatureBase64(document, address, signature); err != nil {
return err
}
}
// no need for txid in values anymore
delete(values, "txid")
if err := db.UpdateTransaction(c, txKey, now, address, values, document, signature); err != nil {
return err
}
return nil
}
func (a *SellActivity) HandleReceipt(log bitwrk.Logger, encResultHash, encResultHashSig string) error {
if err := bitcoin.VerifySignatureBase64(encResultHash, a.tx.Buyer, encResultHashSig); err != nil {
return err
}
if err := SendTxMessageTransmitFinished(a.txId, a.identity, encResultHash, encResultHashSig, a.encResultKey.String()); err != nil {
return fmt.Errorf("Signaling working finished failed: %v", err)
}
return nil
}
func (bid *Bid) Verify() error {
if err := bitcoin.VerifySignatureBase64(bid.Document, bid.Participant, bid.Signature); err != nil {
return fmt.Errorf("Could not validate signature: %v", err)
}
return nil
}