Hello Typescript!

hydro/lib/jwt.ts

@@ -0,0 +1,36 @@
+function decodeBase64WithUriEncoding(encodedText: string) {
+    return Buffer.from(encodedText, 'base64').toString('utf8');
+}
+
+function unescapedString(escapedString: string) {
+    escapedString += new Array(5 - (escapedString.length % 4)).join('=');
+    return escapedString.replace(/-/g, '+').replace(/_/g, '/');
+}
+
+function decodeJWT(idToken: string) {
+    const token = idToken.split('.');
+    if (token.length !== 3) {
+        throw new Error('Invalid idToken');
+    }
+    try {
+        const headerSegment = JSON.parse(decodeBase64WithUriEncoding(token[0]));
+        const payloadSegment = JSON.parse(decodeBase64WithUriEncoding(token[1]));
+        const signature = unescapedString(token[2]);
+        return {
+            dataToSign: [token[0], token[1]].join('.'),
+            header: headerSegment,
+            payload: payloadSegment,
+            signature,
+        };
+    } catch (e) {
+        throw new Error('Invalid payload');
+    }
+}
+
+// eslint-disable-next-line import/prefer-default-export
+export function decode(idToken: string) {
+    const decodedJWT = decodeJWT(idToken);
+    return decodedJWT.payload;
+}
+
+global.Hydro.lib.jwt = { decode };