swift – SafariViewController：如何从URL获取OAuth令牌？

发布时间：2020-12-14 05:46:17 所属栏目：百科来源：网络整理

导读：尝试将Facebook OAuth与SafariViewController一起使用.首先,我使用SafariViewController打开authURL,如果用户登录到Safari上的Facebook,它将重定向它们并返回带有该特定服务的令牌的OAuth URL,例如,Instagram的回复：https://www.facebook.com/connect/logi

尝试将Facebook OAuth与SafariViewController一起使用.首先,我使用SafariViewController打开authURL,如果用户登录到Safari上的Facebook,它将重定向它们并返回带有该特定服务的令牌的OAuth URL,例如,Instagram的

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

当SafariViewController重定向时,我想获取响应URL并存储它,以便我可以获取令牌.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.任何帮助将非常感激！

非常感谢！

iOS 12

iOS 12 Beta已经弃用了SFAuthenticationSession(见下文)而支持ASWebAuthenticationSession.看起来它的使用方式完全相同,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,此测试版API可能仍会发生变化,但互联网上已有几个例子(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

正如一些人在评论中指出的那样,接受的答案是不完整的,不会单独发挥作用.漫步在Strawberry Code的博客文章中,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.所以这一切都是这样的：

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

注册通知以在合理的地方呼叫您的处理程序.我建议不要在viewDidLoad()中进行,而只是在实际呈现SFSafariViewController之前.

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

然后删除处理程序中的observance：

@objc func safariLogin(_ notification : Notification) {

    NotificationCenter.default.removeObserver(self,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,所以一定要采用SFSafariViewControllerDelegate协议并删除这样的遵守：

func safariViewControllerDidFinish(_ controller: SFSafariViewController) {
    NotificationCenter.default.removeObserver(self,object: nil)
}

的Info.plist

要使其全部工作,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必须与您尝试向其提供的Web服务注册的重定向URI的方案相匹配.

（编辑：李大同）

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