1 files changed, 104 insertions, 0 deletions
diff --git a/FrontEnd/src/service-worker.tsx b/FrontEnd/src/service-worker.tsx
new file mode 100644
index 00000000..ea8dfc32
--- /dev/null
+++ b/FrontEnd/src/service-worker.tsx
@@ -0,0 +1,104 @@
+import React from "react";
+import { useTranslation } from "react-i18next";
+import { Button } from "react-bootstrap";
+
+import { pushAlert } from "./services/alert";
+
+if ("serviceWorker" in navigator) {
+  let isThisTriggerUpgrade = false;
+
+  const upgradeSuccessLocalStorageKey = "TIMELINE_UPGRADE_SUCCESS";
+
+  if (window.localStorage.getItem(upgradeSuccessLocalStorageKey)) {
+    pushAlert({
+      message: "serviceWorker.upgradeSuccess",
+      type: "success",
+    });
+    window.localStorage.removeItem(upgradeSuccessLocalStorageKey);
+  }
+
+  void import("workbox-window").then(({ Workbox, messageSW }) => {
+    const wb = new Workbox("/sw.js");
+    let registration: ServiceWorkerRegistration | undefined;
+
+    // externalactivated is not usable but I still use its name.
+    wb.addEventListener("controlling", () => {
+      const upgradeReload = (): void => {
+        window.localStorage.setItem(upgradeSuccessLocalStorageKey, "true");
+        window.location.reload();
+      };
+
+      if (isThisTriggerUpgrade) {
+        upgradeReload();
+      } else {
+        const Message: React.FC = () => {
+          const { t } = useTranslation();
+          return (
+            <>
+              {t("serviceWorker.externalActivatedPrompt")}
+              <Button
+                variant="outline-success"
+                size="sm"
+                onClick={upgradeReload}
+              >
+                {t("serviceWorker.reloadNow")}
+              </Button>
+            </>
+          );
+        };
+
+        pushAlert({
+          message: Message,
+          dismissTime: "never",
+          type: "warning",
+        });
+      }
+    });
+
+    wb.addEventListener("activated", (event) => {
+      if (!event.isUpdate) {
+        pushAlert({
+          message: "serviceWorker.availableOffline",
+          type: "success",
+        });
+      }
+    });
+
+    // Add an event listener to detect when the registered
+    // service worker has installed but is waiting to activate.
+    wb.addEventListener("waiting", (): void => {
+      const upgrade = (): void => {
+        isThisTriggerUpgrade = true;
+        if (registration && registration.waiting) {
+          // Send a message to the waiting service worker,
+          // instructing it to activate.
+          // Note: for this to work, you have to add a message
+          // listener in your service worker. See below.
+          void messageSW(registration.waiting, { type: "SKIP_WAITING" });
+        }
+      };
+
+      const UpgradeMessage: React.FC = () => {
+        const { t } = useTranslation();
+        return (
+          <>
+            {t("serviceWorker.upgradePrompt")}
+            <Button variant="outline-success" size="sm" onClick={upgrade}>
+              {t("serviceWorker.upgradeNow")}
+            </Button>
+          </>
+        );
+      };
+
+      pushAlert({
+        message: UpgradeMessage,
+        dismissTime: "never",
+        type: "success",
+      });
+    });
+
+    void wb.register().then((reg) => {
+      registration = reg;
+    });
+  });
+}