OAuth (client ID/secret) doesn't work

[djbe]

OAuth doesn't work because a few reasons:

1. The respone code cannot be extracted from the path (https://github.com/pvzig/SlackKit/blob/main/SKServer/Sources/Conformers/SwifterServer.swift#L60), because the path no longer contains query items. To get those, the property queryParams (a [(String, String)] must be used.
2. Further it keeps failing with oauth_authorization_url_mismatch, even though the request to slack.com/api/oauth.v2.access contains the same redirect url as configured in the app on slack

The first issue I was able to solve by adding a queryParams to the protocol & struct, and use that instead of extracting query parameters from the path. I'm still stuck with item 2. There may be more issues after that 🤷 It might be related to #203.

Note: I'm trying this with a "legacy" slack app, as otherwise it wouldn't support RTM (see #203)

[djbe]

Here's an example of how to fix queryParams extraction from a request:
djbe@e34a1df

[djbe]

I was able to solve the 2nd issue by reverting the oauthAccess path (https://github.com/pvzig/SlackKit/blob/main/SKWebAPI/Sources/Endpoint.swift#L73) from oauth.v2.access to the old oauth.access path. After that it correctly gets access & bot tokens, and RTM connects.

Branch with both queryParams & path fixes:
https://github.com/djbe/SlackKit/tree/fix/query-params

[pvzig]

Merged and released in https://github.com/pvzig/SlackKit/releases/tag/4.8.0. Thanks!