HMAC support

[artkoenig]

Hi,

I would like to add an HMAC of the URL and request body to the request. The idea was to use a RequestInterceptor to do this. But it does not provide the access to the URL and body. Any ideas how to get this working?

Cheers,
Artjom

[figueredo]

I managed to get the URL of the request by creating a custom client (subclass ApacheClient and override execute() and you'll have access to a Request object) and using it to build the RestAdapter (see RestAdapter.Builder's setClient()).

It is a pity that it is not possible to get the URL with the RequestInterceptor...

[intrications]

Similar to @figueredo, I solved this by creating a SigningClient that implements retrofit.client.Client and wraps my OkClient.

The request object in execute(Request request) gives you access to the URL and body.

[artkoenig]

Thank you very much!

[spiritinlife]

Thank you for your suggestion @intrications . Based on your idea i have some working code implementing this.You can check it here http://spiritinlife.github.io/android/2014/11/27/Retrofit-HMAC-A-Good-way/ .

[loeschg]

Just curious, when you modify the url via a custom client, the RetrofitError (resulting from the request... should there be an error obviously) will return an "outdated" URL, right? Is there any way around this?

[mdrabic]

Okhttp 2.2 has built in support for intercepting and modifying the request before it is sent . I found it possible to achieve this solution using the Interceptors.

[loeschg]

@mdrabic yep, just started using that recently. Thanks!

[bjconlan]

This functionality would be possible without knowing the underlying httpClient if the RequestInterceptor.RequestFacade provided some read functionality... mostly just the current state of the url.

Personally I just want the current url string of the request as an exposed function in the facade.

[JakeWharton]

Use an interceptor in OkHttp. This will not be supported in Retrofit.