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package bmsteams
import (
"context"
"fmt"
"os"
"regexp"
"strings"
"time"
"github.com/42wim/matterbridge/bridge"
"github.com/42wim/matterbridge/bridge/config"
"github.com/mattn/godown"
msgraph "github.com/yaegashi/msgraph.go/beta"
"github.com/yaegashi/msgraph.go/msauth"
"golang.org/x/oauth2"
)
var defaultScopes = []string{"openid", "profile", "offline_access", "Group.Read.All", "Group.ReadWrite.All"}
var attachRE = regexp.MustCompile(`<attachment id=.*?attachment>`)
type Bmsteams struct {
gc *msgraph.GraphServiceRequestBuilder
ctx context.Context
botID string
*bridge.Config
}
func New(cfg *bridge.Config) bridge.Bridger {
return &Bmsteams{Config: cfg}
}
func (b *Bmsteams) Connect() error {
tokenCachePath := b.GetString("sessionFile")
if tokenCachePath == "" {
tokenCachePath = "msteams_session.json"
}
ctx := context.Background()
m := msauth.NewManager()
m.LoadFile(tokenCachePath) //nolint:errcheck
ts, err := m.DeviceAuthorizationGrant(ctx, b.GetString("TenantID"), b.GetString("ClientID"), defaultScopes, nil)
if err != nil {
return err
}
err = m.SaveFile(tokenCachePath)
if err != nil {
b.Log.Errorf("Couldn't save sessionfile in %s: %s", tokenCachePath, err)
}
// make file readable only for matterbridge user
err = os.Chmod(tokenCachePath, 0600)
if err != nil {
b.Log.Errorf("Couldn't change permissions for %s: %s", tokenCachePath, err)
}
httpClient := oauth2.NewClient(ctx, ts)
graphClient := msgraph.NewClient(httpClient)
b.gc = graphClient
b.ctx = ctx
err = b.setBotID()
if err != nil {
return err
}
b.Log.Info("Connection succeeded")
return nil
}
func (b *Bmsteams) Disconnect() error {
return nil
}
func (b *Bmsteams) JoinChannel(channel config.ChannelInfo) error {
go func(name string) {
for {
err := b.poll(name)
if err != nil {
b.Log.Errorf("polling failed for %s: %s. retrying in 5 seconds", name, err)
}
time.Sleep(time.Second * 5)
}
}(channel.Name)
return nil
}
func (b *Bmsteams) Send(msg config.Message) (string, error) {
b.Log.Debugf("=> Receiving %#v", msg)
if msg.ParentID != "" && msg.ParentID != "msg-parent-not-found" {
return b.sendReply(msg)
}
if msg.ParentID == "msg-parent-not-found" {
msg.ParentID = ""
msg.Text = fmt.Sprintf("[thread]: %s", msg.Text)
}
ct := b.gc.Teams().ID(b.GetString("TeamID")).Channels().ID(msg.Channel).Messages().Request()
text := msg.Username + msg.Text
content := &msgraph.ItemBody{Content: &text}
rmsg := &msgraph.ChatMessage{Body: content}
res, err := ct.Add(b.ctx, rmsg)
if err != nil {
return "", err
}
return *res.ID, nil
}
func (b *Bmsteams) sendReply(msg config.Message) (string, error) {
ct := b.gc.Teams().ID(b.GetString("TeamID")).Channels().ID(msg.Channel).Messages().ID(msg.ParentID).Replies().Request()
// Handle prefix hint for unthreaded messages.
text := msg.Username + msg.Text
content := &msgraph.ItemBody{Content: &text}
rmsg := &msgraph.ChatMessage{Body: content}
res, err := ct.Add(b.ctx, rmsg)
if err != nil {
return "", err
}
return *res.ID, nil
}
func (b *Bmsteams) getMessages(channel string) ([]msgraph.ChatMessage, error) {
ct := b.gc.Teams().ID(b.GetString("TeamID")).Channels().ID(channel).Messages().Request()
rct, err := ct.Get(b.ctx)
if err != nil {
return nil, err
}
b.Log.Debugf("got %#v messages", len(rct))
return rct, nil
}
//nolint:gocognit
func (b *Bmsteams) poll(channelName string) error {
msgmap := make(map[string]time.Time)
b.Log.Debug("getting initial messages")
res, err := b.getMessages(channelName)
if err != nil {
return err
}
for _, msg := range res {
msgmap[*msg.ID] = *msg.CreatedDateTime
if msg.LastModifiedDateTime != nil {
msgmap[*msg.ID] = *msg.LastModifiedDateTime
}
}
time.Sleep(time.Second * 5)
b.Log.Debug("polling for messages")
for {
res, err := b.getMessages(channelName)
if err != nil {
return err
}
for i := len(res) - 1; i >= 0; i-- {
msg := res[i]
if mtime, ok := msgmap[*msg.ID]; ok {
if mtime == *msg.CreatedDateTime && msg.LastModifiedDateTime == nil {
continue
}
if msg.LastModifiedDateTime != nil && mtime == *msg.LastModifiedDateTime {
continue
}
}
if *msg.From.User.ID == b.botID {
b.Log.Debug("skipping own message")
msgmap[*msg.ID] = *msg.CreatedDateTime
continue
}
msgmap[*msg.ID] = *msg.CreatedDateTime
if msg.LastModifiedDateTime != nil {
msgmap[*msg.ID] = *msg.LastModifiedDateTime
}
b.Log.Debugf("<= Sending message from %s on %s to gateway", *msg.From.User.DisplayName, b.Account)
text := b.convertToMD(*msg.Body.Content)
rmsg := config.Message{
Username: *msg.From.User.DisplayName,
Text: text,
Channel: channelName,
Account: b.Account,
Avatar: "",
UserID: *msg.From.User.ID,
ID: *msg.ID,
Extra: make(map[string][]interface{}),
}
b.handleAttachments(&rmsg, msg)
b.Log.Debugf("<= Message is %#v", rmsg)
b.Remote <- rmsg
}
time.Sleep(time.Second * 5)
}
}
func (b *Bmsteams) setBotID() error {
req := b.gc.Me().Request()
r, err := req.Get(b.ctx)
if err != nil {
return err
}
b.botID = *r.ID
return nil
}
func (b *Bmsteams) convertToMD(text string) string {
if !strings.Contains(text, "<div>") {
return text
}
var sb strings.Builder
err := godown.Convert(&sb, strings.NewReader(text), nil)
if err != nil {
b.Log.Errorf("Couldn't convert message to markdown %s", text)
return text
}
return sb.String()
}
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