func PlaceBid(bid *bitwrk.RawBid, identity *bitcoin.KeyPair) (bidId string, err error) {
var nonce string
if _nonce, err := GetNonce(); err != nil {
return "", err
} else {
nonce = _nonce
}
articleString := bid.Article.FormString()
priceString := normalize(bid.Price.String())
bidTypeString := bid.Type.FormString()
document := fmt.Sprintf(
"article=%s&type=%s&price=%s&address=%s&nonce=%s",
articleString,
bidTypeString,
priceString,
identity.GetAddress(),
nonce)
signature, err := identity.SignMessage(document, rand.Reader)
if err != nil {
err = fmt.Errorf("Error signing message: %v", err)
return
}
resp, err := postFormToServer("bid", document+"&signature="+url.QueryEscape(signature))
if resp != nil && resp.StatusCode == http.StatusSeeOther && resp.Header.Get("X-Bid-Key") != "" {
bidId = resp.Header.Get("X-Bid-Key")
err = resp.Body.Close()
} else if resp != nil {
more, _ := ioutil.ReadAll(resp.Body)
err = fmt.Errorf("Got status: %#v\nResponse: %v", resp.Status, string(more))
}
return
}
func SendTxMessage(txId string, identity *bitcoin.KeyPair, arguments map[string]string) error {
arguments["txid"] = txId
keys := make([]string, len(arguments))
i := 0
for k, _ := range arguments {
keys[i] = k
i++
}
sort.Strings(keys)
// Prepare document for signature. Document consists of alphabetically sorted
// query arguments, plus "txid"
document := make([]byte, 0, 100)
for _, k := range keys {
if len(document) > 0 {
document = append(document, '&')
}
document = append(document, (k + "=" + normalize(arguments[k]))...)
}
signature := ""
if s, err := identity.SignMessage(string(document), rand.Reader); err != nil {
return err
} else {
signature = s
}
query := string(document) +
"&signature=" + url.QueryEscape(signature) +
"&address=" + url.QueryEscape(identity.GetAddress())
if r, err := postFormToServer("tx/"+txId, query); r != nil {
defer r.Body.Close()
if r.StatusCode == http.StatusSeeOther {
// Success! Do nothing.
} else {
buf := make([]byte, 1024)
n, _ := io.ReadFull(r.Body, buf)
return fmt.Errorf("Unexpected reply status posting form to server: %v (%v)",
r.Status, string(buf[:n]))
}
} else {
return fmt.Errorf("Error posting form to server: %v", err)
}
return nil
}