Perspective key fetching, some federation room join fixes (#975)

* Update gomatrixserverlib

* Test matrix.org as perspective key server

* Base64 decode better

* Optional strict validity checking in gmsl

* Update gomatrixserverlib

* Attempt to find missing auth events over federation (this shouldn't happen but I am guessing there is a synapse bug involved where we don't get all of the auth events)

* Update gomatrixserverlib, debug logging

* Remove debugging output

* More verbose debugging

* Print outliers

* Increase timeouts for testing, observe contexts before trying to join over more servers

* Don't block on roomserver (experimental)

* Don't block on roomserver

* Update gomatrixserverlib

* Update gomatrixserverlib

* Configurable perspective key fetchers

* Output number of configured keys for perspective

* Example perspective config included

* Undo debug stack trace

* Undo debug stack trace

* Restore original HTTP listener in monolith

* Fix lint

* Review comments

* Set default HTTP server timeout to 5 minutes now, block again when joining

* Don't use HTTP address for HTTPS whoops

* Update gomatrixserverlib

* Update gomatrixserverlib

* Update gomatrixserverlib

* Actually add perspectives

* Actually add perspectives

* Update gomatrixserverlib

federationapi/routing/invite.go

@@ -63,9 +63,10 @@ func Invite(
 	// Check that the event is signed by the server sending the request.
 	redacted := event.Redact()
 	verifyRequests := []gomatrixserverlib.VerifyJSONRequest{{
-		ServerName: event.Origin(),
-		Message:    redacted.JSON(),
-		AtTS:       event.OriginServerTS(),
+		ServerName:             event.Origin(),
+		Message:                redacted.JSON(),
+		AtTS:                   event.OriginServerTS(),
+		StrictValidityChecking: true,
 	}}
 	verifyResults, err := keys.VerifyJSONs(httpReq.Context(), verifyRequests)
 	if err != nil {

federationapi/routing/join.go

@@ -196,9 +196,10 @@ func SendJoin(
 	// Check that the event is signed by the server sending the request.
 	redacted := event.Redact()
 	verifyRequests := []gomatrixserverlib.VerifyJSONRequest{{
-		ServerName: event.Origin(),
-		Message:    redacted.JSON(),
-		AtTS:       event.OriginServerTS(),
+		ServerName:             event.Origin(),
+		Message:                redacted.JSON(),
+		AtTS:                   event.OriginServerTS(),
+		StrictValidityChecking: true,
 	}}
 	verifyResults, err := keys.VerifyJSONs(httpReq.Context(), verifyRequests)
 	if err != nil {

federationapi/routing/leave.go

@@ -145,9 +145,10 @@ func SendLeave(
 	// Check that the event is signed by the server sending the request.
 	redacted := event.Redact()
 	verifyRequests := []gomatrixserverlib.VerifyJSONRequest{{
-		ServerName: event.Origin(),
-		Message:    redacted.JSON(),
-		AtTS:       event.OriginServerTS(),
+		ServerName:             event.Origin(),
+		Message:                redacted.JSON(),
+		AtTS:                   event.OriginServerTS(),
+		StrictValidityChecking: true,
 	}}
 	verifyResults, err := keys.VerifyJSONs(httpReq.Context(), verifyRequests)
 	if err != nil {