metatext/Networking/WebAuthSession.swift

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// Copyright © 2020 Metabolist. All rights reserved.
import Foundation
import AuthenticationServices
import Combine
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protocol WebAuthSession: AnyObject {
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init(url URL: URL,
callbackURLScheme: String?,
completionHandler: @escaping WebAuthSessionCompletionHandler)
var presentationContextProvider: WebAuthPresentationContextProviding? { get set }
@discardableResult func start() -> Bool
}
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extension WebAuthSession {
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static func publisher(
url: URL,
callbackURLScheme: String?,
presentationContextProvider: WebAuthPresentationContextProviding) -> AnyPublisher<URL?, Error> {
Future<URL?, Error> { promise in
let webAuthSession = Self(
url: url,
callbackURLScheme: callbackURLScheme) { oauthCallbackURL, error in
if let error = error {
return promise(.failure(error))
}
return promise(.success(oauthCallbackURL))
}
webAuthSession.presentationContextProvider = presentationContextProvider
webAuthSession.start()
}
.eraseToAnyPublisher()
}
}
class WebAuthSessionContextProvider: NSObject, ASWebAuthenticationPresentationContextProviding {
func presentationAnchor(for session: ASWebAuthenticationSession) -> ASPresentationAnchor {
ASPresentationAnchor()
}
}
typealias WebAuthSessionCompletionHandler = ASWebAuthenticationSession.CompletionHandler
typealias WebAuthSessionError = ASWebAuthenticationSessionError
typealias WebAuthPresentationContextProviding = ASWebAuthenticationPresentationContextProviding
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typealias LiveWebAuthSession = ASWebAuthenticationSession
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extension LiveWebAuthSession: WebAuthSession {}