SafariViewController：如何从 URL 中获取 OAuth 令牌？

Question

尝试将 Facebook OAuth 与 SafariViewController 一起使用。首先，我使用 SafariViewController 打开 authURL，如果用户在 Safari 上登录到 Facebook，它将重定向他们并返回带有特定服务令牌的 OAuth URL，例如Instagram

回复：https://www.facebook.com/connect/login_success.html#access_token=BLAHTOKENRESPONSE&expires_in=5114338

当 SafariViewController 重定向后，我想获取响应 URL 并将其存储，以便获取令牌。这是我的代码：

import SafariServices

let kSafariViewControllerCloseNotification = "kSafariViewControllerCloseNotification"

import UIKit

// facebook OAuth URL for service
let authURL = NSURL(string: "https://www.facebook.com/dialog/oauth?client_id=3627644767&redirect_uri=https://www.facebook.com/connect/login_success.html&scope=basic_info,email,public_profile,user_about_me,user_activities,user_birthday,user_education_history,user_friends,user_interests,user_likes,user_location,user_photos,user_relationship_details&response_type=token")

class ViewController: UIViewController, SFSafariViewControllerDelegate {

    var safariVC: SFSafariViewController?
    @IBOutlet weak var loginButton: UIButton!

    @IBAction func loginButtonTapped(sender: UIButton) {
        safariVC = SFSafariViewController(URL: authURL!)
        safariVC!.delegate = self
        self.presentViewController(safariVC!, animated: true, completion: nil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // not firing the safariLogin function below
        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.safariLogin(_:)), name: kSafariViewControllerCloseNotification, object: nil)
    }

    func safariLogin(notification: NSNotification) {
        print("Safari Login call")
        // get the url form the auth callback
        let url = notification.object as! NSURL
        print(url)
        self.safariVC!.dismissViewControllerAnimated(true, completion: nil)
    }

    func application(application: UIApplication, openURL url: NSURL, sourceApplication: String?, annotation: AnyObject) -> Bool {
        print("application call")
        // just making sure we send the notification when the URL is opened in SFSafariViewController
        if (sourceApplication == "com.application.SafariViewTest") {
            NSNotificationCenter.defaultCenter().postNotificationName(kSafariViewControllerCloseNotification, object: url)
            return true
        }
        return true
    }  

}

它会打开 authURL 并重定向到正确的响应 URL，但观察者不会触发 safariLogin 函数来获取 URL。任何帮助将不胜感激！

非常感谢！

Answer 1

iOS 12+

iOS 12 Beta 已弃用 SFAuthenticationSession（见下文）以支持 ASWebAuthenticationSession。看起来使用方式完全相同，但需要新的AuthenticationServices 框架。

iOS 11

iOS 11 引入了SFAuthenticationSession，它更容易处理。鉴于其性质，此 beta API 可能仍会发生变化，但互联网上已经有几个示例（1、2）。首先，您需要一个使用身份验证请求的结果调用的完成处理程序：

let completion : SFAuthenticationSession.CompletionHandler = { (callBack:URL?, error:Error?) in
    guard error == nil, let successURL = callBack else {
        return
    }

    let oauthToken = NSURLComponents(string: (successURL.absoluteString))?.queryItems?.filter({$0.name == "oauth_token"}).first

    // Do what you have to do...
}

然后您只需创建一个 SFAuthenticationSession 并启动它。

let authURL = "https://the.service.you/want/toAuthorizeWith?..."
let scheme = "YOURSCHEME://"
let authSession = SFAuthenticationSession(url: authURL, callbackURLScheme: scheme, completionHandler: completion)
authSession.start()

iOS 10 及之前的版本

正如一些人在 cmets 中指出的那样，接受的答案是不完整的，并且不会单独工作。在浏览草莓代码的博客文章时，可以找到link to the related GitHub project。该项目的README.MD 解释了设置的关键部分，即将重定向URI 添加到Info.plist。所以整个事情是这样的：

AppDelegate.swift

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {

   if let sourceApplication = options[.sourceApplication] {
       if (String(describing: sourceApplication) == "com.apple.SafariViewService") {
            NotificationCenter.default.post(name: Notification.Name("CallbackNotification"), object: url)
            return true
        }
    }

    return false
}

ViewController.swift

注册通知以在某个合理的地方调用您的处理程序。我建议不要在 viewDidLoad() 中这样做，但只能在您实际展示 SFSafariViewController 之前这样做。

NotificationCenter.default.addObserver(self, selector: #selector(safariLogin(_:)), name: Notification.Name("CallbackNotification"), object: nil)
let safariVC = SFSafariViewController(URL: authURL)
safariVC.delegate = self
self.present(safariVC, animated: true, completion: nil)

然后删除处理程序中的遵守：

@objc func safariLogin(_ notification : Notification) {

    NotificationCenter.default.removeObserver(self, name: Notification.Name("CallbackNotification"), object: nil)

    guard let url = notification.object as? URL else {
        return
    }

    // Parse url ...

}

请记住，用户可以通过点击Done 按钮来关闭SFSafariViewController，因此请务必采用SFSafariViewControllerDelegate 协议并删除这样的遵守：

func safariViewControllerDidFinish(_ controller: SFSafariViewController) {
    NotificationCenter.default.removeObserver(self, name: Notification.Name("CallbackNotification"), object: nil)
}

Info.plist

要使这一切正常工作，您需要将重定向 URI 方案添加到 Info.plist：

<key>CFBundleURLTypes</key>
<array>
    <dict>
        <key>CFBundleURLName</key>
        <string>com.YOUR.BUNDLE.IDENTIFIER</string>
        <key>CFBundleURLSchemes</key>
        <array>
            <string>YOURSCHEME</string>
        </array>
    </dict>
</array>

当然 YOURSCHEME 必须与您在尝试授权的 Web 服务中注册的重定向 URI 的方案相匹配。

Answer 2

想通了。其中一些方法是 iOS 9 之前的版本，现在已弃用。我在创建的 ViewController 中也有 application 函数，而它应该在 AppDelagate.swift 中定义。例如

添加在 AppDelegate.swift 的末尾

func application(app: UIApplication, openURL url: NSURL, options: [String : AnyObject]) -> Bool {

        print("app: \(app)")
        // print OAuth response URL
        print("url: \(url)")
        print("options: \(options)")

        if let sourceApplication = options["UIApplicationOpenURLOptionsSourceApplicationKey"] {
            if (String(sourceApplication) == "com.testApp.Incognito") {
                NSNotificationCenter.defaultCenter().postNotificationName(kSafariViewControllerCloseNotification, object: url)
                return true
            }
        }
        return true
    }

ViewController.swift

import SafariServices

let kSafariViewControllerCloseNotification = "kSafariViewControllerCloseNotification"

// facebook OAuth URL
let authURL = NSURL(string: "https://www.facebook.com/dialog/oauth?client_id=3627644767&redirect_uri=https://www.facebook.com/connect/login_success.html&scope=basic_info,email,public_profile,user_about_me,user_activities,user_birthday,user_education_history,user_friends,user_interests,user_likes,user_location,user_photos,user_relationship_details&response_type=token")

class ViewController: UIViewController, SFSafariViewControllerDelegate {

    var safariVC: SFSafariViewController?
    @IBOutlet weak var loginButton: UIButton!

    @IBAction func loginButtonTapped(sender: AnyObject) {
        safariVC = SFSafariViewController(URL: authURL!)
        safariVC!.delegate = self
        self.presentViewController(safariVC!, animated: true, completion: nil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.safariLogin(_:)), name: kSafariViewControllerCloseNotification, object: nil)
    }

    func safariLogin(notification: NSNotification) {
        // get the url from the auth callback
        let url = notification.object as! NSURL
        // Finally dismiss the Safari View Controller with:
        self.safariVC!.dismissViewControllerAnimated(true, completion: nil)
    } 

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    func safariViewControllerDidFinish(controller: SFSafariViewController) {
        controller.dismissViewControllerAnimated(true) { () -> Void in
            print("You just dismissed the login view.")
        }
    }

    func safariViewController(controller: SFSafariViewController, didCompleteInitialLoad didLoadSuccessfully: Bool) {
        print("didLoadSuccessfully: \(didLoadSuccessfully)")

    }
}