feat(message-gateway): run adapters on worker and handle pairing inbound

internal/apps/message_gateway/runner/inbound.go

@@ -0,0 +1,67 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package runner
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/Rain-kl/Wavelet/internal/model"
+	"github.com/Rain-kl/Wavelet/pkg/message_gateway"
+	"gorm.io/gorm"
+)
+
+const pairingTTL = 15 * time.Minute
+
+type inboundDeps struct {
+	LookupBinding func(ctx context.Context, channelID uint64, platformUserID string) (*model.MessageBinding, error)
+	UpsertCode    func(ctx context.Context, channelID uint64, platformUserID, code string, expiresAt time.Time) (*model.MessagePairingCode, error)
+	GenerateCode  func() (string, error)
+	Emit          func(context.Context, message_gateway.InboundMessage) error
+	Send          func(context.Context, message_gateway.Recipient, message_gateway.OutboundMessage) error
+}
+
+// Handle pairs unbound senders or emits bound inbound messages.
+func (d inboundDeps) Handle(ctx context.Context, msg message_gateway.InboundMessage) error {
+	binding, err := d.LookupBinding(ctx, msg.ChannelID, msg.PlatformUserID)
+	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
+		return err
+	}
+	to := message_gateway.Recipient{ChatID: msg.ChatID, PlatformUserID: msg.PlatformUserID}
+	if binding == nil || errors.Is(err, gorm.ErrRecordNotFound) {
+		gen := d.GenerateCode
+		if gen == nil {
+			gen = message_gateway.GenerateCode
+		}
+		code, err := gen()
+		if err != nil {
+			return err
+		}
+		row, err := d.UpsertCode(ctx, msg.ChannelID, msg.PlatformUserID, code, time.Now().Add(pairingTTL))
+		if err != nil {
+			return err
+		}
+		display := message_gateway.FormatCode(row.Code)
+		return d.Send(ctx, to, message_gateway.OutboundMessage{
+			Text:      fmt.Sprintf("Your pairing code is %s. Open Settings → Profile → Bind a bot and enter this code. It expires in 15 minutes.", display),
+			ReplyToID: msg.MessageID,
+		})
+	}
+
+	uid := binding.UserID
+	msg.BindingUserID = &uid
+	if err := d.Emit(ctx, msg); err != nil {
+		_ = d.Send(ctx, to, message_gateway.OutboundMessage{
+			Text:      "could not save your message",
+			ReplyToID: msg.MessageID,
+		})
+		return err
+	}
+	return d.Send(ctx, to, message_gateway.OutboundMessage{
+		Text:      "received",
+		ReplyToID: msg.MessageID,
+	})
+}