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FacebookAuth is for iOS app developers who need to support Facebook login but don't want to use the official SDK
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| // | |
| // FacebookAuth.swift | |
| // GitHub: ethanhuang13 | |
| // Twitter: @ethanhuang13 | |
| import AuthenticationServices | |
| import SafariServices | |
| /* | |
| Updated: | |
| Pointed out by [@hal_lee on Twitter](https://twitter.com/hal_lee/status/1259132680828043265?s=21) this approach violates [Facebook Platform Policy 8.2](https://developers.facebook.com/policy/) and might be contacted by them to stop doing it. | |
| The best way to not using Facebook SDK is not to support Facebook Login at all. | |
| I leave the code here and let you make the decision. | |
| Original: | |
| FacebookAuth is for iOS app developers who need to support Facebook login but don't want to use the official SDK. | |
| iOS 11+ is required since it uses SFAuthenticationSession or ASWebAuthenticationSession. | |
| You need to setup the client id in Facebook Developer console, see https://github.com/fullstackreact/react-native-oauth/issues/76#issuecomment-335902057 | |
| For more information, visit https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow/ | |
| */ | |
| // MARK: Usage | |
| /* | |
| FacebookAuth.start(clientId: "12345678", scope: ["public_profile", "email"], window: UIApplication.shared.keyWindow) { result in | |
| switch result { | |
| case .success(let token): | |
| print(token) | |
| // TODO: Pass token to backend | |
| case .failure(let error): | |
| print(error.localizedDescription) | |
| // TODO: Handle error | |
| } | |
| } | |
| */ | |
| // MARK: Implementation | |
| enum FacebookAuth { | |
| enum AuthError: String, Error, LocalizedError { | |
| case invalidQuery | |
| case noURL | |
| case stateInconsistent | |
| case noAccessToken | |
| var errorDescription: String? { rawValue } | |
| } | |
| static func start(clientId: String, scope: [String], window: UIWindow?, completion: @escaping (Result<String, Error>) -> Void) { | |
| let state = UUID().uuidString | |
| var urlComponents = URLComponents() | |
| urlComponents.scheme = "https" | |
| urlComponents.host = "www.facebook.com" | |
| urlComponents.path = "/v7.0/dialog/oauth" | |
| urlComponents.queryItems = [ | |
| "client_id": clientId, | |
| "response_type": "token", | |
| "redirect_uri": "fb\(clientId)://authorize", | |
| "state": state, | |
| "scope": scope.joined(separator: ",")] | |
| .map { URLQueryItem(name: $0.key, value: $0.value) } | |
| guard let url = urlComponents.url else { | |
| completion(.failure(AuthError.invalidQuery)) | |
| return | |
| } | |
| let callbackURLScheme = "fb\(clientId)" | |
| var session: AuthenticationSession? | |
| let completionHandler: (URL?, Error?) -> Void = { url, error in | |
| session = nil | |
| print("auth callback url: \(url?.absoluteString ?? "failed")") | |
| if let error = error { | |
| completion(.failure(error)) | |
| return | |
| } | |
| guard let url = url else { | |
| completion(.failure(AuthError.noURL)) | |
| return | |
| } | |
| var urlComponents = URLComponents(url: url, resolvingAgainstBaseURL: false) | |
| urlComponents?.query = url.fragment | |
| guard let returnedState = urlComponents?.queryItems?.first(where: { $0.name == "state" })?.value, | |
| returnedState == state else { | |
| completion(.failure(AuthError.stateInconsistent)) | |
| return | |
| } | |
| guard let token = urlComponents?.queryItems?.first(where: { $0.name == "access_token" })?.value else { | |
| completion(.failure(AuthError.noAccessToken)) | |
| return | |
| } | |
| completion(.success(token)) | |
| } | |
| if #available(iOS 12.0, *) { | |
| session = ASWebAuthenticationSession(url: url, callbackURLScheme: callbackURLScheme, completionHandler: completionHandler) | |
| if #available(iOS 13.0, *) { | |
| (session as? ASWebAuthenticationSession)?.presentationContextProvider = window | |
| } | |
| } else { | |
| session = SFAuthenticationSession(url: url, callbackURLScheme: callbackURLScheme, completionHandler: completionHandler) | |
| } | |
| _ = session?.start() | |
| } | |
| } | |
| // MARK: Extensions | |
| protocol AuthenticationSession { | |
| func start() -> Bool | |
| } | |
| extension SFAuthenticationSession: AuthenticationSession { } | |
| @available(iOS 12.0, *) | |
| extension ASWebAuthenticationSession: AuthenticationSession { } | |
| extension UIWindow: ASWebAuthenticationPresentationContextProviding { | |
| @available(iOS 13.0, *) | |
| public func presentationAnchor(for session: ASWebAuthenticationSession) -> ASPresentationAnchor { self } | |
| } |
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| MIT License | |
| Copyright (c) 2020 Ethan Huang | |
| Permission is hereby granted, free of charge, to any person obtaining a copy | |
| of this software and associated documentation files (the "Software"), to deal | |
| in the Software without restriction, including without limitation the rights | |
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| copies of the Software, and to permit persons to whom the Software is | |
| furnished to do so, subject to the following conditions: | |
| The above copyright notice and this permission notice shall be included in all | |
| copies or substantial portions of the Software. | |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
| SOFTWARE. |
LICENSE added. Use the code whatever you want. Thanks.
Pointed out by @hal_lee on Twitter this approach violates Facebook Platform Policy 8.2 and might be contacted by Facebook to stop doing it.
The best way to not using Facebook SDK is not to support Facebook Login at all.
I leave the code here and let you make the decision.
If you still need to use FBSDK but are considering building a "kill switch", you might want to check FacebookAutoInitEnabled in the official document for how not to auto init.
Pointed out by @hal_lee on Twitter this approach violates Facebook Platform Policy 8.2 and might be contacted by Facebook to stop doing it.
Link is move to Developer Policies 6.2
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By the way, I've got a lot of inspiration from my friend @yesleon https://gist.github.com/yesleon/904d8fe418a17467aada5b8661dba665