allow a test notification from the notification help screen

src/views/HelpNotificationsView.vue

@@ -69,12 +69,34 @@
 
       <h2 class="text-xl font-semibold">Auto-detection</h2>
       <p>Show results of auto-detection whether they're turned on</p>
+
+      <button
+        @click="alertWebPushSubscription()"
+        class="block w-full text-center text-md uppercase bg-slate-500 text-white px-1.5 py-2 rounded-md mb-2"
+      >
+        Show Subscription from Web Push Server
+      </button>
+
+      <button
+        @click="sendTestWebPushMessage()"
+        class="block w-full text-center text-md uppercase bg-slate-500 text-white px-1.5 py-2 rounded-md mb-2"
+      >
+        Send Myself a Test Web Push Message
+      </button>
     </div>
   </section>
 </template>
 <script lang="ts">
+import axios from "axios";
 import { Component, Vue } from "vue-facing-decorator";
+
 import QuickNav from "@/components/QuickNav.vue";
+import { db } from "@/db/index";
+import { MASTER_SETTINGS_KEY } from "@/db/tables/settings";
+import { DEFAULT_PUSH_SERVER } from "@/constants/app";
+
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const Buffer = require("buffer/").Buffer;
 
 interface Notification {
   group: string;
@@ -86,5 +108,108 @@ interface Notification {
 @Component({ components: { QuickNav } })
 export default class HelpNotificationsView extends Vue {
   $notify!: (notification: Notification, timeout?: number) => void;
+
+  subscription: PushSubscription | null = null;
+
+  async mounted() {
+    try {
+      const registration = await navigator.serviceWorker.ready;
+      this.subscription = await registration.pushManager.getSubscription();
+    } catch (error) {
+      console.error("Mount error:", error);
+    }
+  }
+
+  alertWebPushSubscription() {
+    console.log(
+      "Web push subscription:",
+      JSON.parse(JSON.stringify(this.subscription)), // gives more info than plain console logging
+    );
+    alert(JSON.stringify(this.subscription));
+  }
+
+  async sendTestWebPushMessage() {
+    if (!this.subscription) {
+      this.$notify(
+        {
+          group: "alert",
+          type: "danger",
+          title: "Not Subscribed",
+          text: "You must enable notifications before testing the web push.",
+        },
+        -1,
+      );
+      return;
+    }
+
+    try {
+      await db.open();
+      const settings = await db.settings.get(MASTER_SETTINGS_KEY);
+      let pushUrl: string = DEFAULT_PUSH_SERVER as string;
+      if (settings?.webPushServer) {
+        pushUrl = settings.webPushServer;
+      }
+
+      // This should be a constant shared with the service worker. See TEST_PUSH_TITLE in additional-scripts.js
+      // Use something other than "Daily Update" https://gitea.anomalistdesign.com/trent_larson/py-push-server/src/commit/3c0e196c11bc98060ec5934e99e7dbd591b5da4d/app.py#L213
+      const DIRECT_PUSH_TITLE = "DIRECT_NOTIFICATION";
+
+      const auth = Buffer.from(this.subscription.getKey("auth"));
+      const authB64 = auth
+        .toString("base64")
+        .replace(/\+/g, "-")
+        .replace(/\//g, "_")
+        .replace(/=+$/, "");
+      const p256dh = Buffer.from(this.subscription.getKey("p256dh"));
+      const p256dhB64 = p256dh
+        .toString("base64")
+        .replace(/\+/g, "-")
+        .replace(/\//g, "_")
+        .replace(/=+$/, "");
+      const newPayload = {
+        endpoint: this.subscription.endpoint,
+        keys: {
+          auth: authB64,
+          p256dh: p256dhB64,
+        },
+        message: "This is a test message, hopefully triggered by you.",
+        title: DIRECT_PUSH_TITLE,
+      };
+      console.log("Sending a test web push message:", newPayload);
+      const payloadStr = JSON.stringify(newPayload);
+      const response = await axios.post(
+        pushUrl + "/web-push/send-test",
+        payloadStr,
+        {
+          headers: {
+            "Content-Type": "application/json",
+          },
+        },
+      );
+
+      console.log("Got response from web push server:", response);
+
+      this.$notify(
+        {
+          group: "alert",
+          type: "success",
+          title: "Test Web Push Sent",
+          text: "Check your device for the test web push message.",
+        },
+        -1,
+      );
+    } catch (error) {
+      console.error("Got an error sending test notification:", error);
+      this.$notify(
+        {
+          group: "alert",
+          type: "danger",
+          title: "Error Sending Test",
+          text: "Got an error sending the test web push notification.",
+        },
+        -1,
+      );
+    }
+  }
 }
 </script>