add request code

src/services/NotificationService.ts

@@ -69,8 +69,47 @@ export class NotificationService {
     this.reloadAPNsTokenIfTimePassed();
     const url = this.getAPNsFullUrlToUse(deviceId);
 
-    // Send the fetch request
+    const shuttle = await this.repository.getShuttleById(shuttleId);
+    const stop = await this.repository.getStopById(stopId);
+    const eta = await this.repository.getEtaForShuttleAndStopId(shuttleId, stopId);
+    // TODO: add more specific errors
+    if (!shuttle) {
+      throw new Error("The shuttle given by the provided shuttleID doesn't exist.");
+    }
+    if (!stop) {
+      throw new Error("The shuttle given by the provided stopId doesn't exist.");
+    }
+    // TODO: account for cases where ETA may not exist due to "data race" with ApiBasedRepositoryLoader
+    if (!eta) {
+      throw new Error("There is no ETA for this shuttle/stop.");
+    }
 
+    // Send the fetch request
+    const bundleId = process.env.APNS_BUNDLE_ID;
+    if (typeof bundleId !== "string") {
+      throw new Error("APNS_BUNDLE_ID environment variable is not set correctly");
+    }
+
+    const headers = {
+      authorization: `bearer ${this.apnsToken}`,
+      "apns-push-type": "alert",
+      "apns-expiration": "0",
+      "apns-priority": "10",
+      "apns-topic": bundleId,
+    };
+    const response = await fetch(url, {
+      method: "POST",
+      headers,
+      body: JSON.stringify({
+        aps: {
+          alert: {
+            title: "Shuttle is arriving",
+            body: `Shuttle is approaching ${stop.name} in ${Math.ceil(eta.secondsRemaining / 60)} minutes.`
+          }
+        }
+      }),
+    });
+    const json = await response.json();
 
     // Check whether it was successful
     // Return the result