Add Nextcloud Talk support (#1167)

Signed-off-by: Gary Kim <gary@garykim.dev>

vendor/gomod.garykim.dev/nc-talk/room/room.go

@@ -0,0 +1,150 @@
+// Copyright (c) 2020 Gary Kim <gary@garykim.dev>, All Rights Reserved
+//
+// 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 room
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"time"
+
+	"github.com/monaco-io/request"
+
+	"gomod.garykim.dev/nc-talk/constants"
+	"gomod.garykim.dev/nc-talk/ocs"
+	"gomod.garykim.dev/nc-talk/user"
+)
+
+// TalkRoom represents a room in Nextcloud Talk
+type TalkRoom struct {
+	User  *user.TalkUser
+	Token string
+}
+
+// SendMessage sends a message in the Talk room
+func (t *TalkRoom) SendMessage(msg string) (*ocs.TalkRoomMessageData, error) {
+	url := t.User.NextcloudURL + constants.BaseEndpoint + "/chat/" + t.Token
+	requestParams := map[string]string{
+		"message": msg,
+	}
+
+	client := t.User.RequestClient(request.Client{
+		URL:    url,
+		Method: "POST",
+		Params: requestParams,
+	})
+	res, err := client.Do()
+	if err != nil {
+		return nil, err
+	}
+	if res.StatusCode() != 201 {
+		return nil, errors.New("unexpected return code")
+	}
+	var msgInfo struct {
+		OCS ocs.TalkRoomSentResponse `json:"ocs"`
+	}
+	err = json.Unmarshal(res.Data, &msgInfo)
+	return &msgInfo.OCS.TalkRoomMessage, err
+}
+
+// ReceiveMessages starts watching for new messages
+func (t *TalkRoom) ReceiveMessages(ctx context.Context) (chan ocs.TalkRoomMessageData, error) {
+	c := make(chan ocs.TalkRoomMessageData)
+	url := t.User.NextcloudURL + constants.BaseEndpoint + "/chat/" + t.Token
+	requestParam := map[string]string{
+		"lookIntoFuture":   "1",
+		"includeLastKnown": "0",
+	}
+	lastKnown := ""
+	client := t.User.RequestClient(request.Client{
+		URL:     url,
+		Params:  requestParam,
+		Timeout: time.Second * 60,
+	})
+	res, err := client.Resp()
+	if err != nil {
+		return nil, err
+	}
+	lastKnown = res.Header.Get("X-Chat-Last-Given")
+	go func() {
+		for {
+			if ctx.Err() != nil {
+				return
+			}
+			if lastKnown != "" {
+				requestParam["lastKnownMessageId"] = lastKnown
+			}
+			client := t.User.RequestClient(request.Client{
+				URL:     url,
+				Params:  requestParam,
+				Timeout: time.Second * 60,
+			})
+
+			res, err := client.Resp()
+			if err != nil {
+				continue
+			}
+			if res.StatusCode == 200 {
+				lastKnown = res.Header.Get("X-Chat-Last-Given")
+				var message struct {
+					OCS ocs.TalkRoomMessage `json:"ocs"`
+				}
+				data, err := ioutil.ReadAll(res.Body)
+				if err != nil {
+					continue
+				}
+				err = json.Unmarshal(data, &message)
+				if err != nil {
+					continue
+				}
+				for _, msg := range message.OCS.TalkRoomMessage {
+					c <- msg
+				}
+			}
+		}
+	}()
+	return c, nil
+}
+
+// TestConnection tests the connection with the Nextcloud Talk instance and returns an error if it could not connect
+func (t *TalkRoom) TestConnection() error {
+	url := t.User.NextcloudURL + constants.BaseEndpoint + "/chat/" + t.Token
+	requestParam := map[string]string{
+		"lookIntoFuture":   "0",
+		"includeLastKnown": "0",
+	}
+	client := t.User.RequestClient(request.Client{
+		URL:     url,
+		Params:  requestParam,
+		Timeout: time.Second * 30,
+	})
+
+	res, err := client.Do()
+	if err != nil {
+		return err
+	}
+	switch res.StatusCode() {
+	case 200:
+		return nil
+	case 304:
+		return nil
+	case 404:
+		return errors.New("room could not be found")
+	case 412:
+		return errors.New("room is in lobby mode but user is not a moderator")
+	}
+	return errors.New("unknown return code")
+}