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// 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"
"errors"
"io/ioutil"
"strconv"
"time"
"github.com/monaco-io/request"
"gomod.garykim.dev/nc-talk/constants"
"gomod.garykim.dev/nc-talk/ocs"
"gomod.garykim.dev/nc-talk/user"
)
var (
// ErrEmptyToken is returned when the room token is empty
ErrEmptyToken = errors.New("given an empty token")
// ErrRoomNotFound is returned when a room with the given token could not be found
ErrRoomNotFound = errors.New("room could not be found")
// ErrNotModeratorInLobby is returned when the room is in lobby mode but the user is not a moderator
ErrNotModeratorInLobby = errors.New("room is in lobby mode but user is not a moderator")
// ErrUnexpectedReturnCode is returned when the server did not respond with an expected return code
ErrUnexpectedReturnCode = errors.New("unexpected return code")
)
// TalkRoom represents a room in Nextcloud Talk
type TalkRoom struct {
User *user.TalkUser
Token string
}
// NewTalkRoom returns a new TalkRoom instance
// Token should be the Nextcloud Room Token (e.g. "d6zoa2zs" if the room URL is https://cloud.mydomain.me/call/d6zoa2zs)
func NewTalkRoom(tuser *user.TalkUser, token string) (*TalkRoom, error) {
if token == "" {
return nil, ErrEmptyToken
}
if tuser == nil {
return nil, user.ErrUserIsNil
}
return &TalkRoom{
User: tuser,
Token: token,
}, nil
}
// 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, ErrUnexpectedReturnCode
}
msgInfo, err := ocs.TalkRoomSentResponseUnmarshal(&res.Data)
if err != nil {
return nil, err
}
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)
err := t.TestConnection()
if err != nil {
return nil, err
}
url := t.User.NextcloudURL + constants.BaseEndpoint + "/chat/" + t.Token
requestParam := map[string]string{
"lookIntoFuture": "1",
"includeLastKnown": "0",
}
lastKnown := ""
res, err := t.User.GetRooms()
if err != nil {
return nil, err
}
for _, r := range *res {
if r.Token == t.Token {
lastKnown = strconv.Itoa(r.LastReadMessage)
break
}
}
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")
data, err := ioutil.ReadAll(res.Body)
_ = res.Body.Close()
if err != nil {
continue
}
message, err := ocs.TalkRoomMessageDataUnmarshal(&data)
if err != nil {
continue
}
for _, msg := range message.OCS.TalkRoomMessage {
c <- msg
}
continue
}
_ = res.Body.Close()
}
}()
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 {
if t.Token == "" {
return ErrEmptyToken
}
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 ErrRoomNotFound
case 412:
return ErrNotModeratorInLobby
}
return ErrUnexpectedReturnCode
}
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