Try to recursively find auth events (to a point) if they are missing (#881)

* Try to recursively find auth events (to a point) if they are missing

* Remove recursion limit for now and other review fixes

* Simplify error handling for recursion

* Pass room version 1 only to MakeJoin until room version support comes later

clientapi/routing/joinroom.go

@@ -299,7 +299,7 @@ func (r joinRoomReq) joinRoomUsingServers(
 // server was invalid this returns an error.
 // Otherwise this returns a JSONResponse.
 func (r joinRoomReq) joinRoomUsingServer(roomID string, server gomatrixserverlib.ServerName) (*util.JSONResponse, error) {
-	respMakeJoin, err := r.federation.MakeJoin(r.req.Context(), server, roomID, r.userID)
+	respMakeJoin, err := r.federation.MakeJoin(r.req.Context(), server, roomID, r.userID, []int{1})
 	if err != nil {
 		// TODO: Check if the user was not allowed to join the room.
 		return nil, err

federationapi/routing/send.go

@@ -211,7 +211,24 @@ func (t *txnReq) processEventWithMissingState(e gomatrixserverlib.Event) error {
 		return err
 	}
 	// Check that the event is allowed by the state.
+retryAllowedState:
 	if err := checkAllowedByState(e, state.StateEvents); err != nil {
+		switch missing := err.(type) {
+		case gomatrixserverlib.MissingAuthEventError:
+			// An auth event was missing so let's look up that event over federation
+			for _, s := range state.StateEvents {
+				if s.EventID() != missing.AuthEventID {
+					continue
+				}
+				err = t.processEventWithMissingState(s)
+				// If there was no error retrieving the event from federation then
+				// we assume that it succeeded, so retry the original state check
+				if err == nil {
+					goto retryAllowedState
+				}
+			}
+		default:
+		}
 		return err
 	}
 	// pass the event along with the state to the roomserver

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/matrix-org/go-http-js-libp2p v0.0.0-20200304160008-4ec1129a00c4
 	github.com/matrix-org/go-sqlite3-js v0.0.0-20200304164012-aa524245b658
 	github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26
-	github.com/matrix-org/gomatrixserverlib v0.0.0-20200304110715-894c3c86ce3e
+	github.com/matrix-org/gomatrixserverlib v0.0.0-20200306154041-df6bb9a3e424
 	github.com/matrix-org/naffka v0.0.0-20200127221512-0716baaabaf1
 	github.com/matrix-org/util v0.0.0-20190711121626-527ce5ddefc7
 	github.com/mattn/go-sqlite3 v2.0.2+incompatible
@@ -17,7 +17,7 @@ require (
 	github.com/pkg/errors v0.8.1
 	github.com/prometheus/client_golang v1.4.1
 	github.com/sirupsen/logrus v1.4.2
-	github.com/tidwall/gjson v1.6.0
+	github.com/tidwall/gjson v1.6.0 // indirect
 	github.com/tidwall/pretty v1.0.1 // indirect
 	github.com/uber/jaeger-client-go v2.22.1+incompatible
 	github.com/uber/jaeger-lib v2.2.0+incompatible

go.sum

@@ -44,6 +44,7 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/gorilla/mux v1.7.3 h1:gnP5JzjVOuiZD07fKKToCAOjS0yOpj/qPETTXCCS6hw=
@@ -70,14 +71,8 @@ github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/matrix-org/dendrite v0.0.0-20200220135450-0352f250b857/go.mod h1:DZ35IoR+ViBNVPe9umdlOSnjvKl7wfyRmZg4QfWGvTo=
 github.com/matrix-org/dugong v0.0.0-20171220115018-ea0a4690a0d5 h1:nMX2t7hbGF0NYDYySx0pCqEKGKAeZIiSqlWSspetlhY=
 github.com/matrix-org/dugong v0.0.0-20171220115018-ea0a4690a0d5/go.mod h1:NgPCr+UavRGH6n5jmdX8DuqFZ4JiCWIJoZiuhTRLSUg=
-github.com/matrix-org/go-http-js-libp2p v0.0.0-20200225225149-e7191ca90a94 h1:gUqPXKWbuwmPnx3PJBxtQw5Ff8V229wZ7Ee0GaH/bg4=
-github.com/matrix-org/go-http-js-libp2p v0.0.0-20200225225149-e7191ca90a94/go.mod h1:PJof7UbOKmVEEMsGqvbyIK0ldMMBjPH5EYia7MHR2RQ=
 github.com/matrix-org/go-http-js-libp2p v0.0.0-20200304160008-4ec1129a00c4 h1:oFjG7X1jS473zPDix1/FBZ2qd0anM1Ko4AlJCB6MUZs=
 github.com/matrix-org/go-http-js-libp2p v0.0.0-20200304160008-4ec1129a00c4/go.mod h1:PJof7UbOKmVEEMsGqvbyIK0ldMMBjPH5EYia7MHR2RQ=
-github.com/matrix-org/go-sqlite3-js v0.0.0-20200226144546-ea6ed5b90074 h1:UWz6vfhmQVshBuE67X1BCsdMhEDtd+uOz8CJ48Fc0F4=
-github.com/matrix-org/go-sqlite3-js v0.0.0-20200226144546-ea6ed5b90074/go.mod h1:e+cg2q7C7yE5QnAXgzo512tgFh1RbQLC0+jozuegKgo=
-github.com/matrix-org/go-sqlite3-js v0.0.0-20200304163011-cfb4884075db h1:ERuFJq4DI8fakfBZlvXHltHZ0ix3K5YsLG0tQfQn6TI=
-github.com/matrix-org/go-sqlite3-js v0.0.0-20200304163011-cfb4884075db/go.mod h1:e+cg2q7C7yE5QnAXgzo512tgFh1RbQLC0+jozuegKgo=
 github.com/matrix-org/go-sqlite3-js v0.0.0-20200304164012-aa524245b658 h1:UlhTKClOgWnSB25Rv+BS/Vc1mRinjNUErfyGEVOBP04=
 github.com/matrix-org/go-sqlite3-js v0.0.0-20200304164012-aa524245b658/go.mod h1:e+cg2q7C7yE5QnAXgzo512tgFh1RbQLC0+jozuegKgo=
 github.com/matrix-org/gomatrix v0.0.0-20190130130140-385f072fe9af h1:piaIBNQGIHnni27xRB7VKkEwoWCgAmeuYf8pxAyG0bI=
@@ -86,14 +81,10 @@ github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26 h1:Hr3zjRsq2bh
 github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26/go.mod h1:3fxX6gUjWyI/2Bt7J1OLhpCzOfO/bB3AiX0cJtEKud0=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20200124100636-0c2ec91d1df5 h1:kmRjpmFOenVpOaV/DRlo9p6z/IbOKlUC+hhKsAAh8Qg=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20200124100636-0c2ec91d1df5/go.mod h1:FsKa2pWE/bpQql9H7U4boOPXFoJX/QcqaZZ6ijLkaZI=
-github.com/matrix-org/gomatrixserverlib v0.0.0-20200228131708-347eb77397b8 h1:a9IV2iKMznKJ16MmcG/NU7qMcZ4jIKmPXC6RkOZZq+Q=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20200306154041-df6bb9a3e424 h1:H61lT6ckUFIDl9qb636qNomfo0B52lFt73ecioiqF10=
-github.com/matrix-org/gomatrixserverlib v0.0.0-20200228131708-347eb77397b8/go.mod h1:FsKa2pWE/bpQql9H7U4boOPXFoJX/QcqaZZ6ijLkaZI=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20200306154041-df6bb9a3e424/go.mod h1:FsKa2pWE/bpQql9H7U4boOPXFoJX/QcqaZZ6ijLkaZI=
-github.com/matrix-org/gomatrixserverlib v0.0.0-20200304110715-894c3c86ce3e h1:DA1lP2mB2ddd2PhMOaNPwRJFi/3aL2Lj7bxnAhFxBFQ=
-github.com/matrix-org/gomatrixserverlib v0.0.0-20200304110715-894c3c86ce3e/go.mod h1:FsKa2pWE/bpQql9H7U4boOPXFoJX/QcqaZZ6ijLkaZI=
 github.com/matrix-org/naffka v0.0.0-20200127221512-0716baaabaf1 h1:osLoFdOy+ChQqVUn2PeTDETFftVkl4w9t/OW18g3lnk=
 github.com/matrix-org/naffka v0.0.0-20200127221512-0716baaabaf1/go.mod h1:cXoYQIENbdWIQHt1SyCo6Bl3C3raHwJ0wgVrXHSqf+A=
-github.com/matrix-org/pq v1.3.2 h1:7Kh2Qz4xonRH8OcFpCIj2najpBxF2+j1ff0hC082L68=
-github.com/matrix-org/pq v1.3.2/go.mod h1:l6tPTzDjcj8fhD5OD0+7dejtZrwyjJadAAYM+CntUVQ=
 github.com/matrix-org/util v0.0.0-20171127121716-2e2df66af2f5 h1:W7l5CP4V7wPyPb4tYE11dbmeAOwtFQBTW0rf4OonOS8=
 github.com/matrix-org/util v0.0.0-20171127121716-2e2df66af2f5/go.mod h1:lePuOiXLNDott7NZfnQvJk0lAZ5HgvIuWGhel6J+RLA=
 github.com/matrix-org/util v0.0.0-20190711121626-527ce5ddefc7 h1:ntrLa/8xVzeSs8vHFHK25k0C+NV74sYMJnNSg5NoSRo=
@@ -200,6 +191,7 @@ golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6 h1:bjcUS9ztw9kFmmIxJInhon/0Is3p+EHBKNgquIzo1OI=
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e h1:vcxGaoTs7kV8m5Np9uUNQin4BrLOthgV7252N8V+FwY=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33 h1:I6FyU15t786LL7oL/hn43zqTuEGr4PN7F4XJ1p4E3Y8=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -212,6 +204,7 @@ golang.org/x/sys v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200122134326-e047566fdf82 h1:ywK/j/KkyTHcdyYSZNXGjMwgmDSfjglYZ3vStQ/gSCU=
 golang.org/x/sys v0.0.0-20200122134326-e047566fdf82/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/Shopify/sarama.v1 v1.20.1 h1:Gi09A3fJXm0Jgt8kuKZ8YK+r60GfYn7MQuEmI3oq6hE=
 gopkg.in/Shopify/sarama.v1 v1.20.1/go.mod h1:AxnvoaevB2nBjNK17cG61A3LleFcWFwVBHBt+cot4Oc=
@@ -220,6 +213,7 @@ gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/h2non/bimg.v1 v1.0.18 h1:qn6/RpBHt+7WQqoBcK+aF2puc6nC78eZj5LexxoalT4=
 gopkg.in/h2non/bimg.v1 v1.0.18/go.mod h1:PgsZL7dLwUbsGm1NYps320GxGgvQNTnecMCZqxV11So=