oauth2-twitch 0.2.0

OAuth 2.0 Twitch
Documentation 
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use oauth2_client::{
    extensions::{
        AccessTokenResponseSuccessfulBody, Builder, BuilderObtainUserInfoError,
        BuilderObtainUserInfoOutput, GrantInfo,
    },
    re_exports::Scope,
};

use super::TwitchUserInfoEndpoint;

//
#[derive(Debug, Clone)]
pub struct TwitchExtensionsBuilder;

impl<SCOPE> Builder<SCOPE> for TwitchExtensionsBuilder
where
    SCOPE: Scope,
{
    fn obtain_user_info(
        &self,
        grant_info: GrantInfo<SCOPE>,
        access_token: &AccessTokenResponseSuccessfulBody<SCOPE>,
    ) -> Result<BuilderObtainUserInfoOutput, BuilderObtainUserInfoError> {
        let client_id = match grant_info {
            GrantInfo::AuthorizationCodeGrant(info) => info.provider.client_id(),
            GrantInfo::DeviceAuthorizationGrant(info) => info.provider.client_id(),
        };
        let client_id = client_id
            .ok_or("client_id missing")
            .map_err(BuilderObtainUserInfoError::Unreachable)?;

        Ok(BuilderObtainUserInfoOutput::Respond(Box::new(
            TwitchUserInfoEndpoint::new(&access_token.access_token, client_id),
        )))
    }
}