Rename the typing server to EDU server (#948)

* Blunt move and sed rename

* Rename common/ refs to typing

* Rename internal stuff in eduserver

* Rename docs and scripts

* Rename constants/filenames, goimports everything to re-order imports

eduserver/input/input.go

@@ -0,0 +1,107 @@
+// 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 input
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"time"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/eduserver/api"
+	"github.com/matrix-org/dendrite/eduserver/cache"
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/matrix-org/util"
+	"gopkg.in/Shopify/sarama.v1"
+)
+
+// EDUServerInputAPI implements api.EDUServerInputAPI
+type EDUServerInputAPI struct {
+	// Cache to store the current typing members in each room.
+	Cache *cache.EDUCache
+	// The kafka topic to output new typing events to.
+	OutputTypingEventTopic string
+	// kafka producer
+	Producer sarama.SyncProducer
+}
+
+// InputTypingEvent implements api.EDUServerInputAPI
+func (t *EDUServerInputAPI) InputTypingEvent(
+	ctx context.Context,
+	request *api.InputTypingEventRequest,
+	response *api.InputTypingEventResponse,
+) error {
+	ite := &request.InputTypingEvent
+	if ite.Typing {
+		// user is typing, update our current state of users typing.
+		expireTime := ite.OriginServerTS.Time().Add(
+			time.Duration(ite.Timeout) * time.Millisecond,
+		)
+		t.Cache.AddTypingUser(ite.UserID, ite.RoomID, &expireTime)
+	} else {
+		t.Cache.RemoveUser(ite.UserID, ite.RoomID)
+	}
+
+	return t.sendEvent(ite)
+}
+
+func (t *EDUServerInputAPI) sendEvent(ite *api.InputTypingEvent) error {
+	ev := &api.TypingEvent{
+		Type:   gomatrixserverlib.MTyping,
+		RoomID: ite.RoomID,
+		UserID: ite.UserID,
+		Typing: ite.Typing,
+	}
+	ote := &api.OutputTypingEvent{
+		Event: *ev,
+	}
+
+	if ev.Typing {
+		expireTime := ite.OriginServerTS.Time().Add(
+			time.Duration(ite.Timeout) * time.Millisecond,
+		)
+		ote.ExpireTime = &expireTime
+	}
+
+	eventJSON, err := json.Marshal(ote)
+	if err != nil {
+		return err
+	}
+
+	m := &sarama.ProducerMessage{
+		Topic: string(t.OutputTypingEventTopic),
+		Key:   sarama.StringEncoder(ite.RoomID),
+		Value: sarama.ByteEncoder(eventJSON),
+	}
+
+	_, _, err = t.Producer.SendMessage(m)
+	return err
+}
+
+// SetupHTTP adds the EDUServerInputAPI handlers to the http.ServeMux.
+func (t *EDUServerInputAPI) SetupHTTP(servMux *http.ServeMux) {
+	servMux.Handle(api.EDUServerInputTypingEventPath,
+		common.MakeInternalAPI("inputTypingEvents", func(req *http.Request) util.JSONResponse {
+			var request api.InputTypingEventRequest
+			var response api.InputTypingEventResponse
+			if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
+				return util.MessageResponse(http.StatusBadRequest, err.Error())
+			}
+			if err := t.InputTypingEvent(req.Context(), &request, &response); err != nil {
+				return util.ErrorResponse(err)
+			}
+			return util.JSONResponse{Code: http.StatusOK, JSON: &response}
+		}),
+	)
+}