Add OlmMachine.deviceCreationTimeMs

CHANGELOG.md

@@ -1,5 +1,8 @@
 # UNRELEASED
 
+-   Add `OlmMachine.deviceCreationTimeMs`.
+    ([#112](https://github.com/matrix-org/matrix-rust-sdk-crypto-wasm/pull/112))
+
 # matrix-sdk-crypto-wasm v4.8.0
 
 -   Add `OlmMachine.dehydratedDevices()` and `DehydratedDevices` class to

src/machine.rs

@@ -150,6 +150,18 @@ impl OlmMachine {
         identifiers::DeviceId::from(self.inner.device_id().to_owned())
     }
 
+    /// The time, in milliseconds since the unix epoch, at which the `Account`
+    /// backing this `OlmMachine` was created.
+    ///
+    /// An `Account` is created when an `OlmMachine` is first instantiated
+    /// against a given `Store`, at which point it creates identity keys etc.
+    /// This method returns the timestamp, according to the local clock, at
+    /// which that happened.
+    #[wasm_bindgen(getter, js_name = "deviceCreationTimeMs")]
+    pub fn device_creation_time_ms(&self) -> f64 {
+        self.inner.device_creation_time().get().into()
+    }
+
     /// Get the public parts of our Olm identity keys.
     #[wasm_bindgen(getter, js_name = "identityKeys")]
     pub fn identity_keys(&self) -> vodozemac::IdentityKeys {

tests/machine.test.ts

@@ -214,6 +214,13 @@ describe(OlmMachine.name, () => {
         expect((await machine()).deviceId.toString()).toStrictEqual(device.toString());
     });
 
+    test("can read creation time", async () => {
+        const startTime = Date.now();
+        const creationTime = (await machine()).deviceCreationTimeMs;
+        expect(creationTime).toBeLessThanOrEqual(Date.now());
+        expect(creationTime).toBeGreaterThanOrEqual(startTime);
+    });
+
     test("can read identity keys", async () => {
         const identityKeys = (await machine()).identityKeys;