Gateway: status route with per-route results, test push, reconnect and unpair

gateway/src/push.ts

@@ -0,0 +1,63 @@
+// Delivers pushes to paired watches through APNs, and remembers Apple's last answer so the watch's
+// status screen can show whether pushes are getting through. Without APNs settings it only logs.
+
+import type { Apns } from "./apns.ts";
+import type { PushResult } from "./contract.ts";
+import type { Db, DeviceRow } from "./db.ts";
+import type { Push } from "./notify.ts";
+
+export class Pusher {
+  /** Apple's answer to the most recent push sent to any watch. */
+  last: PushResult | null = null;
+
+  constructor(
+    private readonly db: Db,
+    private readonly apns: Apns | null,
+    private readonly log: (message: string) => void = () => {},
+  ) {}
+
+  get configured() {
+    return this.apns !== null;
+  }
+
+  /** Sends to every paired watch that registered for pushes. */
+  sendAll = async (push: Push): Promise<void> => {
+    const devices = this.db.devices.active().filter((device) => device.apns_token && device.apns_env);
+    if (!this.apns || devices.length === 0) {
+      this.log(`push (not sent): [${push.category}] ${push.title}: ${push.body}`);
+      return;
+    }
+    await Promise.all(devices.map((device) => this.sendTo(device, push)));
+  };
+
+  /** Sends to one watch and returns what Apple said. */
+  async sendTo(device: DeviceRow, push: Push): Promise<PushResult> {
+    const at = new Date().toISOString();
+    if (!this.apns) return { ok: false, at, status: 0, reason: "The gateway has no APNs key configured." };
+    if (!device.apns_token || !device.apns_env) {
+      return { ok: false, at, status: 0, reason: "This watch has not registered for notifications." };
+    }
+    const payload = {
+      aps: {
+        alert: { title: push.title, ...(push.subtitle ? { subtitle: push.subtitle } : {}), body: push.body },
+        sound: "default",
+        category: push.category,
+        "thread-id": push.data.threadId ?? push.data.hostId ?? push.category,
+      },
+      ...push.data,
+    };
+    const answer = await this.apns.send({
+      deviceToken: device.apns_token,
+      environment: device.apns_env,
+      payload,
+      collapseId: push.collapseId,
+    });
+    const result: PushResult = answer.ok ? { ok: true, at, status: 200, reason: null } : { ok: false, at, status: answer.status, reason: answer.reason };
+    this.last = result;
+    if (!answer.ok) {
+      this.log(`APNs refused a push to ${device.name}: ${answer.status} ${answer.reason}`);
+      if (answer.tokenInvalid) this.db.devices.clearPush(device.apns_token);
+    }
+    return result;
+  }
+}