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main.go
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main.go
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package main
import (
"fmt"
"os"
"strings"
log "github.com/sirupsen/logrus"
"github.com/slack-go/slack"
)
var userMap map[string]string
var channelMap map[string]string
func getChannelMap(api *slack.Client) (map[string]string, error) {
log.Infof("Getting channel ID <=> Name mapping")
channelMap := map[string]string{}
for cursor := "init"; cursor == "init" || cursor != ""; {
if cursor == "init" {
cursor = ""
}
var channels []slack.Channel
var err error
params := &slack.GetConversationsParameters{
Cursor: cursor,
ExcludeArchived: true,
Types: []string{"public_channel", "private_channel"},
}
channels, cursor, err = api.GetConversations(params)
if err != nil {
return nil, err
}
for _, channel := range channels {
channelMap[channel.Name] = channel.ID
log.Infof("Got channel '%s' (%s)", channel.Name, channel.ID)
}
}
return channelMap, nil
}
func getUserMap(api *slack.Client) (map[string]string, error) {
log.Infof("Getting user ID <=> Name mapping")
userMap := map[string]string{}
users, err := api.GetUsers()
if err != nil {
return nil, err
}
for _, user := range users {
log.Infof("Got user '%s' (%s)", user.Name, user.ID)
userMap[user.Name] = user.ID
}
return userMap, nil
}
func leaveChannel(api *slack.Client, self, channel string) {
log.Infof("Having %s (%s) leave channel %s (%s)", self, userMap[self], channel, channelMap[channel])
_, err := api.LeaveConversation(channelMap[channel])
if err != nil {
log.Fatalf("Error leaving channel: %#v", err)
}
}
func inviteUsersToChannel(api *slack.Client, self string, channel string, users []string) error {
params := &slack.GetUsersInConversationParameters{
ChannelID: channelMap[channel],
}
usersInChannel, _, _ := api.GetUsersInConversation(params)
// See if the bot is a member of the channel
foundSelf := false
for _, u := range usersInChannel {
if u == userMap[self] {
foundSelf = true
log.Infof("User %s (%s) is already in the channel %s (%s)", self, userMap[self], channel, channelMap[channel])
break
}
}
// Create a list of users to invite based on if they're already in the channel or not
var newUsers []string
var logString string
for _, user := range users {
foundUser := false
for _, u := range usersInChannel {
if userMap[user] == u {
log.Infof("Found user %s (%s) in channel %s (%s)", user, userMap[user], channel, channelMap[channel])
foundUser = true
break
}
}
if !foundUser {
log.Infof("No user %s (%s) in channel %s (%s)", user, userMap[user], channel, channelMap[channel])
newUsers = append(newUsers, userMap[user])
if logString == "" {
logString = fmt.Sprintf("%s (%s)", user, userMap[user])
} else {
logString = logString + fmt.Sprintf(", %s (%s)", user, userMap[user])
}
}
}
if len(newUsers) == 0 {
log.Info("No users to invite.")
return nil
}
// Invite the users
if !foundSelf {
log.Infof("Inviting %s to join channel %s (%s)", logString, channel, channelMap[channel])
_, _, _, err := api.JoinConversation(channelMap[channel])
if err != nil {
return err
}
defer leaveChannel(api, self, channel)
}
usersString := strings.Join(newUsers, ",")
_, err := api.InviteUsersToConversation(channelMap[channel], usersString)
if err != nil {
return err
}
return nil
}
func getEnvVar(name string) string {
value := os.Getenv(name)
if value == "" {
log.Fatalf("No %s set.", name)
}
return value
}
func main() {
// Make sure our environment variables are set
slackToken := getEnvVar("SLACK_TOKEN")
slackChannelUsersString := getEnvVar("SLACK_CHANNEL_USERS")
slackChannelString := getEnvVar("SLACK_CHANNELS")
api := slack.New(
slackToken,
)
// Get bot self info
self, err := api.AuthTest()
if err != nil {
log.Fatalf("Error getting myself: %#v\n", err)
}
// Get user -> ID mapping
userMap, err = getUserMap(api)
if err != nil {
log.Fatalf("Unable to get user map: %#v\n", err)
}
// Get channel -> ID mapping
channelMap, err = getChannelMap(api)
if err != nil {
log.Fatalf("Unable to get channel map: %#v\n", err)
}
// Make sure each channel that we're trying to manipulate actually exists
var slackChannels []string
for _, channel := range strings.Split(slackChannelString, ",") {
if _, ok := channelMap[channel]; ok {
slackChannels = append(slackChannels, channel)
} else {
log.Fatalf("%s is not a valid channel.", channel)
}
}
// Make sure each user we're trying to add actually exists
var slackChannelUsers []string
for _, user := range strings.Split(slackChannelUsersString, ",") {
if _, ok := userMap[user]; ok {
slackChannelUsers = append(slackChannelUsers, user)
} else {
log.Fatalf("%s is not a valid user.", user)
}
}
for _, channel := range slackChannels {
err := inviteUsersToChannel(api, self.User, channel, slackChannelUsers)
if err != nil {
log.Fatalf("Unable to invite users to channel %s (%s): %#v\n", channel, channelMap[channel], err)
}
}
}