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slack.go
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slack.go
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package main
import (
"fmt"
"io"
"log"
"net/http"
"os"
"regexp"
"strings"
"time"
"github.com/kmc-jp/DiscordSlackSynchronizer/discord_webhook"
"github.com/kmc-jp/DiscordSlackSynchronizer/settings"
"github.com/kmc-jp/DiscordSlackSynchronizer/slack_webhook"
"github.com/pkg/errors"
"github.com/slack-go/slack"
"github.com/slack-go/slack/slackevents"
scm "github.com/slack-go/slack/socketmode"
)
type SlackLastMessages map[string]string
type SlackHandler struct {
api *slack.Client
userAPI *slack.Client
scm *scm.Client
regExp struct {
UserID *regexp.Regexp
Channel *regexp.Regexp
URI *regexp.Regexp
}
messageUnescaper *strings.Replacer
discordHook *discord_webhook.Handler
messageFinder *MessageFinder
hook *slack_webhook.Handler
userHook *slack_webhook.Handler
apiToken string
eventToken string
userToken string
workspaceURI string
settings *settings.Handler
reactionHandler ReactionHandler
filePublishEmoji string
}
func NewSlackBot(apiToken, eventToken string, settings *settings.Handler) *SlackHandler {
var slackBot SlackHandler
slackBot.api = slack.New(
apiToken,
slack.OptionAppLevelToken(eventToken),
)
slack.OptionLog(log.New(os.Stdout, "slack-bot: ", log.Lshortfile|log.LstdFlags))
slackBot.scm = scm.New(slackBot.api)
slackBot.regExp.UserID = regexp.MustCompile(`<@(\S+)>`)
slackBot.regExp.Channel = regexp.MustCompile(`<#(\S+)\|(\S+)>`)
slackBot.regExp.URI = regexp.MustCompile(`<(https??://\S+)\|(\S+)>`)
slackBot.apiToken = apiToken
slackBot.eventToken = eventToken
slackBot.settings = settings
slackBot.filePublishEmoji = "#"
res, _ := slackBot.api.AuthTest()
slackBot.workspaceURI = res.URL
slackBot.messageUnescaper = strings.NewReplacer(
"&", "&",
"<", "<",
">", ">",
)
return &slackBot
}
func (s *SlackHandler) Do() {
go func() {
var err = s.scm.Run()
if err != nil {
fmt.Println(err)
}
}()
for ev := range s.scm.Events {
switch ev.Type {
case scm.EventTypeConnected:
fmt.Printf("Start websocket connection with Slack\n")
case scm.EventTypeEventsAPI:
s.scm.Ack(*ev.Request)
evp, ok := ev.Data.(slackevents.EventsAPIEvent)
if !ok {
continue
}
switch evp.Type {
case slackevents.CallbackEvent:
switch evi := evp.InnerEvent.Data.(type) {
case *slackevents.AppMentionEvent:
case *slackevents.MessageEvent:
s.messageHandle(evi)
case *slackevents.EmojiChangedEvent:
s.emojiChangeHandle(evi)
case *slackevents.ReactionAddedEvent:
if evi.Item.Type == "message" {
if evi.Reaction == s.filePublishEmoji {
var err = s.FilePublish(evi.Item.Channel, evi.Item.Timestamp, evi.User)
if err != nil {
log.Println(err)
}
}
s.reactionHandle(evi.Item.Channel, evi.Item.Timestamp)
}
case *slackevents.ReactionRemovedEvent:
if evi.Item.Type == "message" {
if evi.Reaction == s.filePublishEmoji {
var err = s.FileRevokePublicLink(evi.Item.Channel, evi.Item.Timestamp, evi.User)
if err != nil {
log.Println(err)
}
}
s.reactionHandle(evi.Item.Channel, evi.Item.Timestamp)
}
}
}
}
}
}
func (s *SlackHandler) SetReactionHandler(handler ReactionHandler) {
s.reactionHandler = handler
}
func (s *SlackHandler) SetMessageFinder(handler *MessageFinder) {
s.messageFinder = handler
}
func (s *SlackHandler) SetFilePublishEmoji(emoji string) {
s.filePublishEmoji = emoji
}
func (s *SlackHandler) SetDiscordWebhook(hook *discord_webhook.Handler) {
s.discordHook = hook
}
func (s *SlackHandler) SetSlackWebhook(hook *slack_webhook.Handler) {
s.hook = hook
}
func (s *SlackHandler) SetUserToken(token string) {
s.userToken = token
s.userHook = slack_webhook.New(token)
s.userAPI = slack.New(token)
}
func (s *SlackHandler) reactionHandle(channel string, timestamp string) {
if s.reactionHandler != nil {
err := s.reactionHandler.GetReaction(channel, timestamp)
if err != nil {
log.Println("GetReaction:", err)
}
}
}
func (s *SlackHandler) emojiChangeHandle(ev *slackevents.EmojiChangedEvent) {
switch ev.Subtype {
case "add":
var uri = ev.Value
if strings.HasPrefix(ev.Value, "alias:") {
uri = s.reactionHandler.GetEmojiURI(strings.TrimPrefix(uri, "alias:"))
}
s.reactionHandler.AddEmoji(ev.Name, uri)
case "remove":
for _, name := range ev.Names {
s.reactionHandler.RemoveEmoji(name)
}
case "rename":
s.reactionHandler.RemoveEmoji(ev.OldName)
s.reactionHandler.AddEmoji(ev.NewName, ev.Value)
}
}
func (s *SlackHandler) messageHandle(ev *slackevents.MessageEvent) {
var cs, discordID = s.settings.FindDiscordChannel(ev.Channel)
//Confirm Slack to Discord setting
if !cs.Setting.SlackToDiscord {
return
}
// ignore own messages
if ev.User == s.hook.Identity.UserID {
return
}
// ignore specified messages
if cs.Setting.MuteSlackUsers.Find(ev.User) {
return
}
// delete events not sends
switch ev.SubType {
case "", "file_share":
break
case "message_deleted":
// TODO: delete discord messages
return
default:
return
}
type imageFileType struct {
info slackevents.File
reader io.Reader
}
var ImageFiles []imageFileType
var files = []slackevents.File{}
for _, f := range ev.Files {
// if the file is image, upload it for discord
if f.Filetype == "png" || f.Filetype == "jpg" || f.Filetype == "gif" {
req, err := http.NewRequest("GET", f.URLPrivate, nil)
req.Header.Set("Authorization", "Bearer "+s.apiToken)
if err != nil {
continue
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
continue
}
defer resp.Body.Close()
var image = imageFileType{
info: f,
reader: resp.Body,
}
ImageFiles = append(ImageFiles, image)
} else {
files = append(files, f)
}
}
text, err := s.EscapeMessage(ev.Text)
if err != nil {
return
}
// user, err := s.api.GetUserInfo(ev.User)
user, err := s.hook.GetUserProfile(ev.User, false)
if err != nil {
return
}
var name = user.DisplayName
if name == "" {
name = user.RealName
}
// send file links by webhook
for _, f := range files {
text += "\n" + f.Permalink
}
var dFiles = []discord_webhook.File{}
// upload images to discord
if len(ImageFiles) > 0 {
for _, f := range ImageFiles {
dFiles = append(dFiles, discord_webhook.File{
FileName: f.info.Name,
Reader: f.reader,
ContentType: "image/" + f.info.Filetype,
})
}
}
// Send by webhook
var message = discord_webhook.Message{
AvaterURL: user.GetUserImageURI(),
UserName: name,
GuildID: discordID,
ChannelID: cs.DiscordChannel,
Content: text,
}
newMessage, err := s.discordHook.Send(cs.DiscordChannel, message, true, dFiles)
if err != nil {
log.Println(errors.Wrap(err, "ResendingFileMessage: "))
return
}
// if user api token is provided, delete message and repost it.
if s.userAPI != nil {
_, _, err := s.userAPI.DeleteMessage(ev.Channel, ev.TimeStamp)
if err == nil {
var content = ev.Text + " " + s.messageFinder.CreateURIformat(newMessage.Timestamp.Format(time.RFC3339), ev.User, "")
var blocks = []slack_webhook.BlockBase{}
for i, image := range ImageFiles {
if len(newMessage.Attachments) > i {
var block = slack_webhook.ImageBlock(newMessage.Attachments[i].URL, image.info.Name)
block.Title = slack_webhook.ImageTitle(image.info.Name, false)
blocks = append(blocks, block)
}
}
for _, file := range files {
var externalID = fmt.Sprintf("%s:%s", ProgramName, file.ID)
_, err := s.hook.FilesRemoteAdd(
slack_webhook.FilesRemoteAddParameters{
Title: file.Name,
ExternalURL: file.Permalink,
ExternalID: externalID,
FileType: file.Filetype,
},
)
if err != nil {
log.Printf("FilesRemoteAddError: %s\n", err.Error())
continue
}
blocks = append(blocks, slack_webhook.FileBlock(externalID))
}
if (len(files) > 0 || len(ImageFiles) > 0) && ev.Text != "" {
var section = slack_webhook.SectionBlock()
section.Text = slack_webhook.MrkdwnElement(ev.Text, false)
blocks = append([]slack_webhook.BlockBase{section}, blocks...)
}
var message = slack_webhook.Message{
IconURL: user.GetUserImageURI(),
Username: name,
Channel: ev.Channel,
Text: content,
Blocks: blocks,
UnfurlLinks: true,
UnfurlMedia: true,
LinkNames: true,
}
// Send message to Slack
s.hook.Send(message)
}
}
}
func (s *SlackHandler) EscapeMessage(content string) (output string, err error) {
for _, id := range s.regExp.UserID.FindAllStringSubmatch(content, -1) {
if len(id) < 2 {
continue
}
u, err := s.api.GetUserInfo(id[1])
if err != nil {
return "", err
}
var repl = u.Profile.DisplayName
if repl == "" {
repl = u.RealName
}
content = strings.Join(strings.Split(content, id[0]), "`@"+repl+"`")
}
for _, ch := range s.regExp.Channel.FindAllStringSubmatch(content, -1) {
if len(ch) < 3 {
continue
}
content = strings.Join(strings.Split(content,
fmt.Sprintf("<#%s|%s>", ch[1], ch[2])),
fmt.Sprintf("`#%s`(URI: <%sarchives/%s>)", ch[2], s.workspaceURI, ch[1]),
)
}
for _, uri := range s.regExp.URI.FindAllStringSubmatch(content, -1) {
if len(uri) < 3 {
continue
}
if uri[1] == uri[2] {
content = strings.Join(strings.Split(content,
fmt.Sprintf("<%s|%s>", uri[1], uri[2])),
fmt.Sprintf("<%s>)", uri[1]),
)
}
content = strings.Join(strings.Split(content,
fmt.Sprintf("<%s|%s>", uri[1], uri[2])),
fmt.Sprintf("%s(URI: <%s>)", uri[2], uri[1]),
)
}
return s.messageUnescaper.Replace(content), nil
}
func (s *SlackHandler) FilePublish(channel, timestamp, userID string) error {
srcContent, err := s.hook.GetMessage(channel, timestamp)
if err != nil {
return errors.Wrap(err, "SlackGetMessage")
}
var meta = s.messageFinder.ParseMetaData(srcContent.Text)
if meta.SlackUserID == "" || userID != meta.SlackUserID {
return nil
}
for i, block := range srcContent.Blocks {
if block.Type == "file" {
if !strings.Contains(block.ExternalID, fmt.Sprintf("%s:", ProgramName)) {
continue
}
var fileID = strings.Split(block.ExternalID, fmt.Sprintf("%s:", ProgramName))[1]
file, _, _, err := s.userAPI.ShareFilePublicURL(fileID)
if err != nil {
log.Println("FilePublish: ShareFilePublicURL: ", err)
continue
}
err = s.hook.FilesRemoteRemove(block.ExternalID, "")
if err != nil {
log.Println("FilePublish: FilesRemoteRemove: ", err)
continue
}
s.hook.FilesRemoteAdd(
slack_webhook.FilesRemoteAddParameters{
Title: file.Name,
ExternalURL: file.PermalinkPublic,
ExternalID: block.ExternalID,
FileType: file.Filetype,
},
)
srcContent.Blocks[i] = slack_webhook.FileBlock(block.ExternalID)
}
}
s.hook.Update(*srcContent)
return nil
}
func (s *SlackHandler) FileRevokePublicLink(channel, timestamp, userID string) error {
srcContent, err := s.hook.GetMessage(channel, timestamp)
if err != nil {
return errors.Wrap(err, "SlackGetMessage")
}
var meta = s.messageFinder.ParseMetaData(srcContent.Text)
if meta.SlackUserID == "" || userID != meta.SlackUserID {
return nil
}
for i, block := range srcContent.Blocks {
if block.Type == "file" {
if !strings.Contains(block.ExternalID, fmt.Sprintf("%s:", ProgramName)) {
continue
}
var fileID = strings.Split(block.ExternalID, fmt.Sprintf("%s:", ProgramName))[1]
file, err := s.userAPI.RevokeFilePublicURL(fileID)
if err != nil {
log.Println("FileRevokePublicLink: RevokeFilePublicURL: ", err)
continue
}
err = s.hook.FilesRemoteRemove(block.ExternalID, "")
if err != nil {
log.Println("FileRevokePublicLink: FilesRemoteRemove: ", err)
continue
}
s.hook.FilesRemoteAdd(
slack_webhook.FilesRemoteAddParameters{
Title: file.Name,
ExternalURL: file.Permalink,
ExternalID: block.ExternalID,
FileType: file.Filetype,
},
)
srcContent.Blocks[i] = slack_webhook.FileBlock(block.ExternalID)
}
}
s.hook.Update(*srcContent)
return nil
}