chore: poc

packages/extension/src/shared/shield/backend/time.ts

@@ -0,0 +1,54 @@
+import urlJoin from "url-join"
+
+import { ARGENT_API_BASE_URL } from "../../api/constants"
+import { fetcherWithArgentApiHeaders } from "../../api/fetcher"
+
+interface GetTimeResponse {
+  time: number
+}
+
+export const getBackendTime = async () => {
+  try {
+    const fetcher = fetcherWithArgentApiHeaders()
+    const { time } = await fetcher<GetTimeResponse>(
+      urlJoin(ARGENT_API_BASE_URL, `time`),
+    )
+    return time
+  } catch (error) {
+    throw new Error("failed to request email verification")
+  }
+}
+
+let _backendTimeSkew: number
+
+export const getBackendTimeSkew = async () => {
+  if (_backendTimeSkew !== undefined) {
+    return _backendTimeSkew
+  }
+  const timeStart = new Date().getTime()
+  const backendTime = await getBackendTime()
+  const timeNow = new Date().getTime()
+  const responseTime = (timeNow - timeStart) / 2
+  const backendTimeNow = backendTime * 1000 + responseTime
+  const backendTimeSkew = backendTimeNow - timeNow
+  if (_backendTimeSkew) {
+    console.log("Predicted backendTime", timeStart + backendTimeSkew)
+    console.log("Predicted backendTimeNow", timeNow + backendTimeSkew)
+  }
+  _backendTimeSkew = backendTimeSkew
+  console.log({
+    timeStart,
+    backendTime: backendTime * 1000,
+    timeNow,
+    responseTime,
+    backendTimeNow,
+    backendTimeSkew,
+  })
+  return _backendTimeSkew
+}
+
+export const getBackendTimeNow = async () => {
+  const timeNow = new Date().getTime()
+  const backendTimeSkew = await getBackendTimeSkew()
+  return timeNow + backendTimeSkew
+}