From 5d8ea2ac5166bf1b80b7ec9c425f39d576a918da Mon Sep 17 00:00:00 2001
From: Sudhanshu Jaiswal <sudsjaiswal@gmail.com>
Date: Wed, 3 Oct 2018 00:52:37 +0530
Subject: [PATCH] Federation: Add event_auth endpoint

Signed-off-by: Sudhanshu Jaiswal <sudsjaiswal@gmail.com>
---
 .../federationapi/routing/eventauth.go        | 41 +++++++++++++++++++
 .../dendrite/federationapi/routing/routing.go | 10 +++++
 2 files changed, 51 insertions(+)
 create mode 100644 src/github.com/matrix-org/dendrite/federationapi/routing/eventauth.go

diff --git a/src/github.com/matrix-org/dendrite/federationapi/routing/eventauth.go b/src/github.com/matrix-org/dendrite/federationapi/routing/eventauth.go
new file mode 100644
index 000000000..dab17f084
--- /dev/null
+++ b/src/github.com/matrix-org/dendrite/federationapi/routing/eventauth.go
@@ -0,0 +1,41 @@
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package routing
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/matrix-org/util"
+)
+
+// GetEventAuth returns event auth for the roomID and eventID
+func GetEventAuth(
+	ctx context.Context,
+	request *gomatrixserverlib.FederationRequest,
+	query api.RoomserverQueryAPI,
+	roomID string,
+	eventID string,
+) util.JSONResponse {
+	state, err := getState(ctx, request, query, roomID, eventID)
+	if err != nil {
+		return *err
+	}
+
+	return util.JSONResponse{
+		Code: http.StatusOK,
+		JSON: gomatrixserverlib.RespEventAuth{AuthEvents: state.AuthEvents},
+	}
+}
diff --git a/src/github.com/matrix-org/dendrite/federationapi/routing/routing.go b/src/github.com/matrix-org/dendrite/federationapi/routing/routing.go
index c7c0f7e21..05a398e01 100644
--- a/src/github.com/matrix-org/dendrite/federationapi/routing/routing.go
+++ b/src/github.com/matrix-org/dendrite/federationapi/routing/routing.go
@@ -129,6 +129,16 @@ func Setup(
 		},
 	)).Methods(http.MethodGet)
 
+	v1fedmux.Handle("/event_auth/{roomID}/{eventID}", common.MakeFedAPI(
+		"federation_get_event_auth", cfg.Matrix.ServerName, keys,
+		func(httpReq *http.Request, request *gomatrixserverlib.FederationRequest) util.JSONResponse {
+			vars := mux.Vars(httpReq)
+			return GetEventAuth(
+				httpReq.Context(), request, query, vars["roomID"], vars["eventID"],
+			)
+		},
+	)).Methods(http.MethodGet)
+
 	v1fedmux.Handle("/query/directory", common.MakeFedAPI(
 		"federation_query_room_alias", cfg.Matrix.ServerName, keys,
 		func(httpReq *http.Request, request *gomatrixserverlib.FederationRequest) util.JSONResponse {