Merge pull request #16206 from gluk256/277-mailserver

whisper: mailserver no longer supports the signature validation

Mailserver is provided as an example, but client validation belongs to the upper layer protocol and
needs not be covered in this example. The check that was previously available hinders the switch
to libp2p so we agreed not to include that check in that example code anymore.

whisper/mailserver/mailserver.go

@@ -17,7 +17,6 @@
 package mailserver
 
 import (
-	"bytes"
 	"encoding/binary"
 	"fmt"
 
@@ -175,7 +174,10 @@ func (s *WMailServer) validateRequest(peerID []byte, request *whisper.Envelope)
 	if len(src)-len(peerID) == 1 {
 		src = src[1:]
 	}
-	if !bytes.Equal(peerID, src) {
+
+	// if you want to check the signature, you can do it here. e.g.:
+	// if !bytes.Equal(peerID, src) {
+	if src == nil {
 		log.Warn(fmt.Sprintf("Wrong signature of p2p request"))
 		return false, 0, 0, topic
 	}

whisper/mailserver/server_test.go

@@ -167,8 +167,9 @@ func singleRequest(t *testing.T, server *WMailServer, env *whisper.Envelope, p *
 
 	src[0]++
 	ok, lower, upper, topic = server.validateRequest(src, request)
-	if ok {
+	if !ok {
-		t.Fatalf("request validation false positive, seed: %d (lower: %d, upper: %d).", seed, lower, upper)
+		// request should be valid regardless of signature
+		t.Fatalf("request validation false negative, seed: %d (lower: %d, upper: %d).", seed, lower, upper)
 	}
 }