fix @staab's mess.

handlers.go

@@ -6,7 +6,6 @@ import (
 	"encoding/hex"
 	"errors"
 	"net/http"
-	"os"
 	"strings"
 	"sync"
 	"time"
@@ -316,10 +315,7 @@ func (rl *Relay) HandleWebsocket(w http.ResponseWriter, r *http.Request) {
 					id := string(*env)
 					rl.removeListenerId(ws, id)
 				case *nostr.AuthEnvelope:
-					wsBaseUrl := os.Getenv("RELAY_URL")
-					if wsBaseUrl == "" {
-						wsBaseUrl = strings.Replace(getServiceBaseURL(r), "http", "ws", 1)
-					}
+					wsBaseUrl := strings.Replace(rl.getBaseURL(r), "http", "ws", 1)
 					if pubkey, ok := nip42.ValidateAuthEvent(&env.Event, ws.Challenge, wsBaseUrl); ok {
 						ws.AuthedPublicKey = pubkey
 						ws.authLock.Lock()

helpers.go

@@ -3,7 +3,6 @@ package khatru
 import (
 	"net"
 	"net/http"
-	"strconv"
 	"strings"
 
 	"github.com/nbd-wtf/go-nostr"
@@ -14,28 +13,6 @@ func isOlder(previous, next *nostr.Event) bool {
 		(previous.CreatedAt == next.CreatedAt && previous.ID > next.ID)
 }
 
-func getServiceBaseURL(r *http.Request) string {
-	host := r.Header.Get("X-Forwarded-Host")
-	if host == "" {
-		host = r.Host
-	}
-	proto := r.Header.Get("X-Forwarded-Proto")
-	if proto == "" {
-		if host == "localhost" {
-			proto = "http"
-		} else if strings.Index(host, ":") != -1 {
-			// has a port number
-			proto = "http"
-		} else if _, err := strconv.Atoi(strings.ReplaceAll(host, ".", "")); err == nil {
-			// it's a naked IP
-			proto = "http"
-		} else {
-			proto = "https"
-		}
-	}
-	return proto + "://" + host
-}
-
 var privateMasks = func() []net.IPNet {
 	privateCIDRs := []string{
 		"127.0.0.0/8",

nip86.go

@@ -80,7 +80,7 @@ func (rl *Relay) HandleNIP86(w http.ResponseWriter, r *http.Request) {
 			goto respond
 		}
 
-		if uTag := evt.Tags.GetFirst([]string{"u", ""}); uTag == nil || getServiceBaseURL(r) != (*uTag)[1] {
+		if uTag := evt.Tags.GetFirst([]string{"u", ""}); uTag == nil || rl.getBaseURL(r) != (*uTag)[1] {
 			resp.Error = "invalid 'u' tag"
 			goto respond
 		} else if pht := evt.Tags.GetFirst([]string{"payload", hex.EncodeToString(payloadHash[:])}); pht == nil {

relay.go

@@ -5,6 +5,8 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"strconv"
+	"strings"
 	"sync"
 	"time"
 
@@ -45,6 +47,9 @@ func NewRelay() *Relay {
 }
 
 type Relay struct {
+	// setting this variable overwrites the hackish workaround we do to try to figure out our own base URL
+	ServiceURL string
+
 	// hooks that will be called at various times
 	RejectEvent               []func(ctx context.Context, event *nostr.Event) (reject bool, msg string)
 	OverwriteDeletionOutcome  []func(ctx context.Context, target *nostr.Event, deletion *nostr.Event) (acceptDeletion bool, msg string)
@@ -104,3 +109,29 @@ type Relay struct {
 	PingPeriod     time.Duration // Send pings to peer with this period. Must be less than pongWait.
 	MaxMessageSize int64         // Maximum message size allowed from peer.
 }
+
+func (rl *Relay) getBaseURL(r *http.Request) string {
+	if rl.ServiceURL != "" {
+		return rl.ServiceURL
+	}
+
+	host := r.Header.Get("X-Forwarded-Host")
+	if host == "" {
+		host = r.Host
+	}
+	proto := r.Header.Get("X-Forwarded-Proto")
+	if proto == "" {
+		if host == "localhost" {
+			proto = "http"
+		} else if strings.Index(host, ":") != -1 {
+			// has a port number
+			proto = "http"
+		} else if _, err := strconv.Atoi(strings.ReplaceAll(host, ".", "")); err == nil {
+			// it's a naked IP
+			proto = "http"
+		} else {
+			proto = "https"
+		}
+	}
+	return proto + "://" + host
+}