feature: add EmbeddedKeyCredentials request signer

[eduard-romaniuk]

Hi! I propose to add a class that will add to request embedded key (aka website key) without hostname.

Use case:

I want to use US Autocomplete Pro on my server. This API doesn't support server keys, so I need to use an embedded key instead. But SmartyStreets have security rate limits for embedded keys, so one IP cannot spam requests. Documentation advises whitelist IP to bypass security limits. But SmartyStreets looks at hostname instead of IP if it specified (saw that on practice), so I should specify server IP in the hostname or just don't specify a hostname.

[joliver]

The intended use case is interactive with someone at the keyboard inspecting the response and not for server-to-server interactions.

[eduard-romaniuk]

@joliver Sorry, I didn't get what you mean

[joliver]

The purpose of the US Autocomplete Pro API is for end users to call that endpoints API directly. We don't intend for direct server calls. This is part of the reason why it's not enabled that way in the SDKs.

[eduard-romaniuk]

@joliver Yeah, I know. But anyway you have a workaround for this (IP whitelisting), so I thought it would be great to have this possibility in SDK as well.

[joliver]

There's a reason we don't have that in the SDK:

https://www.smartystreets.com/legal/licenses/us-autocomplete-pro

The US Autocomplete Pro product is intended to be used by individual natural persons (“Consumers”) and not by automated or computer assisted means or devices. Input of address queries are to be interactively submitted by a Consumer keystroke by keystroke to arrive at a given result and it is anticipated that the results are viewed by a Consumer.

[eduard-romaniuk]

Okay