Add PKCE support and also ExtraParams to plugin data #3
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Add
ExtraParamsto plugin data. This allows sending non-standard query items to server. For example Microsoft identity platform uses this to know that it should prompt user to select account.This also implements "pixie". It is enabled by default as there should be very little harm if the server does not support it. However, if the service is broken and may not receive
code_challenge, then there isSkipPKCEproperty that can be set to true.There is no support for "plain" method as the specification requires that implementations use "S256" when the device can handle sha256. Server must always support it anyway.
Code challenge is generated just like the specification recommends, constructing 32-octet sequence that is then base64url encoded.