Add Discord inbound replies.

internal/discord/bot.go

@@ -13,6 +13,7 @@ import (
 	"github.com/bwmarrin/discordgo"
 
 	"plumber/internal/events"
+	"plumber/internal/mail"
 	"plumber/internal/store"
 )
 
@@ -23,6 +24,10 @@ type Bot struct {
 	channelID string
 	links     store.DiscordLinkStore
 	api       API
+	store     store.Store
+	mail      mail.Notifier
+	admins    map[string]string
+	botUserID string
 }
 
 // New constructs an outbound subscriber. Tests inject a fake API.
@@ -31,7 +36,7 @@ func New(channelID string, links store.DiscordLinkStore, api API) *Bot {
 }
 
 // FromEnv builds a bot when Discord env is set. Missing config is a no-op.
-func FromEnv(links store.DiscordLinkStore, bus *events.Bus) (*Bot, error) {
+func FromEnv(links store.DiscordLinkStore, bus *events.Bus, st store.Store, mailer mail.Notifier) (*Bot, error) {
 	token := strings.TrimSpace(os.Getenv("DISCORD_BOT_TOKEN"))
 	channelID := strings.TrimSpace(os.Getenv("DISCORD_CHANNEL_ID"))
 	if token == "" && channelID == "" {
@@ -50,11 +55,26 @@ func FromEnv(links store.DiscordLinkStore, bus *events.Bus) (*Bot, error) {
 	if err != nil {
 		return nil, err
 	}
+	session.Identify.Intents = discordgo.IntentsGuilds | discordgo.IntentsGuildMessages | discordgo.IntentsMessageContent
+	if mailer == nil {
+		mailer = mail.Nop{}
+	}
 	bot := New(channelID, links, &sessionAPI{session: session})
+	bot.store = st
+	bot.mail = mailer
+	bot.admins = parseAdminMap(os.Getenv("DISCORD_ADMIN_MAP"))
+	session.AddHandler(bot.onMessageCreate)
 	if bus != nil {
 		bus.Subscribe(bot.Handle)
 	}
-	log.Printf("discord: outbound subscriber enabled")
+	if err := session.Open(); err != nil {
+		_ = session.Close()
+		return nil, fmt.Errorf("discord gateway: %w", err)
+	}
+	if session.State != nil && session.State.User != nil {
+		bot.botUserID = session.State.User.ID
+	}
+	log.Printf("discord: subscriber enabled")
 	return bot, nil
 }