Re: [push-api] Message encryption (#130)

I've updated the PR, which I think is largely OK.

@costinm:

> getPublicKey ? Is the parameter optional ( since enum can have only one
possible value anyways ) ?

I don't see much advantage in making the parameter optional.  On the syntactic noise vs. being specific debate I always fall in the latter camp.

> Also it should document very clearly what's in the ArrayBuffer - the DER
encoding ? And how do we expect apps to send it to the app server ?

The specification describes the encoding that is expected: https://tools.ietf.org/html/draft-thomson-webpush-encryption-01#section-5

Apps should be able to use the serializer on `PushSubscription`, that is, `JSON.stringify`.  The only question I have here is how `ArrayBuffer` attributes are handled.

---
Reply to this email directly or view it on GitHub:
https://github.com/w3c/push-api/pull/130#issuecomment-127770908