/
bunker.go
188 lines (169 loc) · 4.89 KB
/
bunker.go
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package main
import (
"context"
"encoding/json"
"fmt"
"net/url"
"os"
"sync"
"time"
"github.com/fatih/color"
"github.com/nbd-wtf/go-nostr"
"github.com/nbd-wtf/go-nostr/nip19"
"github.com/nbd-wtf/go-nostr/nip46"
"github.com/urfave/cli/v2"
"golang.org/x/exp/slices"
)
var bunker = &cli.Command{
Name: "bunker",
Usage: "starts a NIP-46 signer daemon with the given --sec key",
ArgsUsage: "[relay...]",
Description: ``,
Flags: []cli.Flag{
&cli.StringFlag{
Name: "sec",
Usage: "secret key to sign the event, as hex or nsec",
DefaultText: "the key '1'",
Value: "0000000000000000000000000000000000000000000000000000000000000001",
},
&cli.BoolFlag{
Name: "prompt-sec",
Usage: "prompt the user to paste a hex or nsec with which to sign the event",
},
&cli.BoolFlag{
Name: "yes",
Aliases: []string{"y"},
Usage: "always respond to any NIP-46 requests from anyone",
},
},
Action: func(c *cli.Context) error {
// try to connect to the relays here
qs := url.Values{}
relayURLs := make([]string, 0, c.Args().Len())
if relayUrls := c.Args().Slice(); len(relayUrls) > 0 {
_, relays := connectToAllRelays(c.Context, relayUrls)
if len(relays) == 0 {
log("failed to connect to any of the given relays.\n")
os.Exit(3)
}
for _, relay := range relays {
relayURLs = append(relayURLs, relay.URL)
qs.Add("relay", relay.URL)
}
}
if len(relayURLs) == 0 {
return fmt.Errorf("not connected to any relays: please specify at least one")
}
// gather the secret key
sec, _, err := gatherSecretKeyOrBunkerFromArguments(c)
if err != nil {
return err
}
pubkey, err := nostr.GetPublicKey(sec)
if err != nil {
return err
}
npub, _ := nip19.EncodePublicKey(pubkey)
bunkerURI := fmt.Sprintf("bunker://%s?%s", pubkey, qs.Encode())
bold := color.New(color.Bold).Sprint
printBunkerInfo := func() {
log("listening at %v:\n pubkey: %s \n npub: %s\n bunker: %s\n\n",
bold(relayURLs),
bold(pubkey),
bold(npub),
bold(bunkerURI),
)
}
printBunkerInfo()
alwaysYes := c.Bool("yes")
// subscribe to relays
pool := nostr.NewSimplePool(c.Context)
events := pool.SubMany(c.Context, relayURLs, nostr.Filters{
{
Kinds: []int{24133},
Tags: nostr.TagMap{"p": []string{pubkey}},
},
})
signer := nip46.NewStaticKeySigner(sec)
handlerWg := sync.WaitGroup{}
printLock := sync.Mutex{}
// just a gimmick
var cancelPreviousBunkerInfoPrint context.CancelFunc
_, cancel := context.WithCancel(c.Context)
cancelPreviousBunkerInfoPrint = cancel
for ie := range events {
cancelPreviousBunkerInfoPrint() // this prevents us from printing a million bunker info blocks
// handle the NIP-46 request event
req, resp, eventResponse, harmless, err := signer.HandleRequest(ie.Event)
if err != nil {
log("< failed to handle request from %s: %s\n", ie.Event.PubKey, err.Error())
continue
}
jreq, _ := json.MarshalIndent(req, " ", " ")
log("- got request from '%s': %s\n", color.New(color.Bold, color.FgBlue).Sprint(ie.Event.PubKey), string(jreq))
jresp, _ := json.MarshalIndent(resp, " ", " ")
log("~ responding with %s\n", string(jresp))
if alwaysYes || harmless || askProceed(ie.Event.PubKey) {
handlerWg.Add(len(relayURLs))
for _, relayURL := range relayURLs {
go func(relayURL string) {
if relay, _ := pool.EnsureRelay(relayURL); relay != nil {
err := relay.Publish(c.Context, eventResponse)
printLock.Lock()
if err == nil {
log("* sent response through %s\n", relay.URL)
} else {
log("* failed to send response: %s\n", err)
}
printLock.Unlock()
handlerWg.Done()
}
}(relayURL)
}
handlerWg.Wait()
}
// just after handling one request we trigger this
go func() {
ctx, cancel := context.WithCancel(c.Context)
defer cancel()
cancelPreviousBunkerInfoPrint = cancel
// the idea is that we will print the bunker URL again so it is easier to copy-paste by users
// but we will only do if the bunker is inactive for more than 5 minutes
select {
case <-ctx.Done():
case <-time.After(time.Minute * 5):
fmt.Fprintf(os.Stderr, "\n")
printBunkerInfo()
}
}()
}
return nil
},
}
var allowedSources = make([]string, 0, 2)
func askProceed(source string) bool {
if slices.Contains(allowedSources, source) {
return true
}
fmt.Fprintf(os.Stderr, "request from %s:\n", color.New(color.Bold, color.FgBlue).Sprint(source))
res, err := ask(" proceed to fulfill this request? (yes/no/always from this) (y/n/a): ", "",
func(answer string) bool {
if answer != "y" && answer != "n" && answer != "a" {
return true
}
return false
})
if err != nil {
return false
}
switch res {
case "n":
return false
case "y":
return true
case "a":
allowedSources = append(allowedSources, source)
return true
}
return false
}