feat(config): gate channel config writes

src/slack/monitor/events/channels.ts

@@ -1,11 +1,18 @@
 import type { SlackEventMiddlewareArgs } from "@slack/bolt";
 
-import { danger } from "../../../globals.js";
+import { loadConfig, writeConfigFile } from "../../../config/config.js";
+import { resolveChannelConfigWrites } from "../../../channels/plugins/config-writes.js";
+import { danger, warn } from "../../../globals.js";
 import { enqueueSystemEvent } from "../../../infra/system-events.js";
 
 import { resolveSlackChannelLabel } from "../channel-config.js";
 import type { SlackMonitorContext } from "../context.js";
-import type { SlackChannelCreatedEvent, SlackChannelRenamedEvent } from "../types.js";
+import { migrateSlackChannelConfig } from "../../channel-migration.js";
+import type {
+  SlackChannelCreatedEvent,
+  SlackChannelIdChangedEvent,
+  SlackChannelRenamedEvent,
+} from "../types.js";
 
 export function registerSlackChannelEvents(params: { ctx: SlackMonitorContext }) {
   const { ctx } = params;
@@ -75,4 +82,74 @@ export function registerSlackChannelEvents(params: { ctx: SlackMonitorContext })
       }
     },
   );
+
+  ctx.app.event(
+    "channel_id_changed",
+    async ({ event, body }: SlackEventMiddlewareArgs<"channel_id_changed">) => {
+      try {
+        if (ctx.shouldDropMismatchedSlackEvent(body)) return;
+
+        const payload = event as SlackChannelIdChangedEvent;
+        const oldChannelId = payload.old_channel_id;
+        const newChannelId = payload.new_channel_id;
+        if (!oldChannelId || !newChannelId) return;
+
+        const channelInfo = await ctx.resolveChannelName(newChannelId);
+        const label = resolveSlackChannelLabel({
+          channelId: newChannelId,
+          channelName: channelInfo?.name,
+        });
+
+        ctx.runtime.log?.(
+          warn(`[slack] Channel ID changed: ${oldChannelId} → ${newChannelId} (${label})`),
+        );
+
+        if (
+          !resolveChannelConfigWrites({
+            cfg: ctx.cfg,
+            channelId: "slack",
+            accountId: ctx.accountId,
+          })
+        ) {
+          ctx.runtime.log?.(
+            warn("[slack] Config writes disabled; skipping channel config migration."),
+          );
+          return;
+        }
+
+        const currentConfig = loadConfig();
+        const migration = migrateSlackChannelConfig({
+          cfg: currentConfig,
+          accountId: ctx.accountId,
+          oldChannelId,
+          newChannelId,
+        });
+
+        if (migration.migrated) {
+          migrateSlackChannelConfig({
+            cfg: ctx.cfg,
+            accountId: ctx.accountId,
+            oldChannelId,
+            newChannelId,
+          });
+          await writeConfigFile(currentConfig);
+          ctx.runtime.log?.(warn("[slack] Channel config migrated and saved successfully."));
+        } else if (migration.skippedExisting) {
+          ctx.runtime.log?.(
+            warn(
+              `[slack] Channel config already exists for ${newChannelId}; leaving ${oldChannelId} unchanged`,
+            ),
+          );
+        } else {
+          ctx.runtime.log?.(
+            warn(
+              `[slack] No config found for old channel ID ${oldChannelId}; migration logged only`,
+            ),
+          );
+        }
+      } catch (err) {
+        ctx.runtime.error?.(danger(`slack channel_id_changed handler failed: ${String(err)}`));
+      }
+    },
+  );
 }

src/slack/monitor/types.ts

@@ -46,6 +46,13 @@ export type SlackChannelRenamedEvent = {
   event_ts?: string;
 };
 
+export type SlackChannelIdChangedEvent = {
+  type: "channel_id_changed";
+  old_channel_id?: string;
+  new_channel_id?: string;
+  event_ts?: string;
+};
+
 export type SlackPinEvent = {
   type: "pin_added" | "pin_removed";
   channel_id?: string;