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paymail.go
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paymail.go
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package bux
import (
"context"
"errors"
"strings"
"time"
"github.com/mrz1836/go-cachestore"
"github.com/tonicpow/go-paymail"
)
// getCapabilities is a utility function to retrieve capabilities for a Paymail provider
func getCapabilities(ctx context.Context, cs cachestore.ClientInterface, client paymail.ClientInterface,
domain string) (*paymail.CapabilitiesPayload, error) {
// Attempt to get from cachestore
// todo: allow user to configure the time that they want to cache the capabilities (if they want to cache or not)
capabilities := new(paymail.CapabilitiesPayload)
if err := cs.GetModel(
ctx, cacheKeyCapabilities+domain, capabilities,
); err != nil && !errors.Is(err, cachestore.ErrKeyNotFound) {
return nil, err
} else if capabilities != nil && len(capabilities.Capabilities) > 0 {
return capabilities, nil
}
// Get SRV record (domain can be different!)
var response *paymail.CapabilitiesResponse
srv, err := client.GetSRVRecord(
paymail.DefaultServiceName, paymail.DefaultProtocol, domain,
)
if err != nil {
// Error returned was a real error
if !strings.Contains(err.Error(), "zero SRV records found") { // This error is from no SRV record being found
return nil, err
}
// Try to get capabilities without the SRV record
// 'Should no record be returned, a paymail client should assume a host of <domain>.<tld> and a port of 443.'
// http://bsvalias.org/02-01-host-discovery.html
// Get the capabilities via target
if response, err = client.GetCapabilities(
domain, paymail.DefaultPort,
); err != nil {
return nil, err
}
} else {
// Get the capabilities via SRV record
if response, err = client.GetCapabilities(
srv.Target, int(srv.Port),
); err != nil {
return nil, err
}
}
// Save to cachestore
if cs != nil && !cs.Engine().IsEmpty() {
_ = cs.SetModel(
context.Background(), cacheKeyCapabilities+domain,
&response.CapabilitiesPayload, cacheTTLCapabilities,
)
}
return &response.CapabilitiesPayload, nil
}
// hasP2P will return the P2P urls and true if they are both found
func hasP2P(capabilities *paymail.CapabilitiesPayload) (success bool, p2pDestinationURL, p2pSubmitTxURL string) {
p2pDestinationURL = capabilities.GetString(paymail.BRFCP2PPaymentDestination, "")
p2pSubmitTxURL = capabilities.GetString(paymail.BRFCP2PTransactions, "")
if len(p2pSubmitTxURL) > 0 && len(p2pDestinationURL) > 0 {
success = true
}
return
}
// resolvePaymailAddress is an old way to resolve a Paymail address (if P2P is not supported)
//
// Deprecated: this is already deprecated by TSC, use P2P or the new P4
func resolvePaymailAddress(ctx context.Context, cs cachestore.ClientInterface, client paymail.ClientInterface,
capabilities *paymail.CapabilitiesPayload, alias, domain, purpose, senderPaymail string) (*paymail.ResolutionPayload, error) {
// Attempt to get from cachestore
// todo: allow user to configure the time that they want to cache the address resolution (if they want to cache or not)
resolution := new(paymail.ResolutionPayload)
if err := cs.GetModel(
ctx, cacheKeyAddressResolution+alias+"-"+domain, resolution,
); err != nil && !errors.Is(err, cachestore.ErrKeyNotFound) {
return nil, err
} else if resolution != nil && len(resolution.Output) > 0 {
return resolution, nil
}
// Get the URL
addressResolutionURL := capabilities.GetString(
paymail.BRFCBasicAddressResolution, paymail.BRFCPaymentDestination,
)
if len(addressResolutionURL) == 0 {
return nil, ErrMissingAddressResolutionURL
}
// Resolve address
response, err := client.ResolveAddress(
addressResolutionURL,
alias, domain,
&paymail.SenderRequest{
Dt: time.Now().UTC().Format(time.RFC3339), // UTC is assumed
Purpose: purpose, // Generic message about the resolution
SenderHandle: senderPaymail, // Assumed it's a paymail@domain.com
},
)
if err != nil {
return nil, err
}
// Save to cachestore
if cs != nil && !cs.Engine().IsEmpty() {
_ = cs.SetModel(
ctx, cacheKeyAddressResolution+alias+"-"+domain,
&response.ResolutionPayload, cacheTTLAddressResolution,
)
}
return &response.ResolutionPayload, nil
}
// startP2PTransaction will start the P2P transaction, returning the reference ID and outputs
func startP2PTransaction(client paymail.ClientInterface,
alias, domain, p2pDestinationURL string, satoshis uint64) (*paymail.PaymentDestinationPayload, error) {
// Start the P2P transaction request
response, err := client.GetP2PPaymentDestination(
p2pDestinationURL,
alias, domain,
&paymail.PaymentRequest{Satoshis: satoshis},
)
if err != nil {
return nil, err
}
return &response.PaymentDestinationPayload, nil
}
// finalizeP2PTransaction will notify the paymail provider about the transaction
func finalizeP2PTransaction(client paymail.ClientInterface,
alias, domain, p2pSubmitURL, referenceID, note, senderPaymailAddress, txHex string) (*paymail.P2PTransactionPayload, error) {
// Submit the P2P transaction
/*logger.Data(2, logger.DEBUG, "sending p2p tx...",
logger.MakeParameter("alias", alias),
logger.MakeParameter("p2pSubmitURL", p2pSubmitURL),
logger.MakeParameter("domain", domain),
logger.MakeParameter("note", note),
logger.MakeParameter("senderPaymailAddress", senderPaymailAddress),
logger.MakeParameter("referenceID", referenceID),
)*/
response, err := client.SendP2PTransaction(p2pSubmitURL, alias, domain, &paymail.P2PTransaction{
Hex: txHex,
MetaData: &paymail.P2PMetaData{
Note: note,
Sender: senderPaymailAddress,
},
Reference: referenceID,
})
if err != nil {
return nil, err
}
return &response.P2PTransactionPayload, nil
}