1 files changed, 24 insertions, 0 deletions
diff --git a/server/google.ts b/server/google.ts
new file mode 100644
index 0000000..3fe6362
--- /dev/null
+++ b/server/google.ts
@@ -0,0 +1,24 @@
+import got from "got/dist/source";
+
+export const fetchIdToken = async function (aud: string): Promise<string> {
+    const metadataServerTokenURL = `http://metadata/computeMetadata/v1/instance/service-accounts/default/identity?audience=${aud}`;
+
+    let resp;
+    try {
+        resp = await got(metadataServerTokenURL, {
+            headers: {
+                "Metadata-Flavor": "Google"
+            }
+        });
+    } catch (err) {
+        console.error(err);
+        throw new Error("Failed to fetch ID token from Google metadata endpoint");
+    }
+
+    const token = resp.body;
+    if (!token) {
+        throw new Error("ID token from Google metadata endpoint is empty");
+    }
+
+    return token;
+};