AWS iOS SDK Cognito开发人员身份验证(Swift)

Question

我很难弄清楚如何将我的服务器(通过AWS)提供的开发人员凭证返回给我的示例身份提供商.

看来我需要refresh在ExampleIdentityProvider类的方法中同步执行此操作.我正在使用AFNetworking发出请求,但它是异步GET请求.如何在IdentityProvider上为刷新方法同步执行此操作？

以下是Swift:

class ExampleIdentityProvider: AWSAbstractIdentityProvider  {
    var newToken: String!

    override var token: String {
        get {
            return newToken
        }
        set {
            newToken = newValue
        }
    }

    override func getIdentityId() -> BFTask! {
        if self.identityId != nil {
            return BFTask(result: self.identityId)
        }else{
            return BFTask(result: nil).continueWithBlock({ (task) -> AnyObject! in
                if self.identityId == nil {
                    return self.refresh()
                }
                return BFTask(result: self.identityId)
            })
        }
    }

    override func refresh() -> BFTask! {
        return BFTask(result: nil).continueWithBlock({ (task) -> AnyObject! in
            let result =  AFNETWORKING REQUEST FOR CREDENTIALS TO MY SERVER
            self.identityId = result.identityId
            self.token = result.token

            return BFTask(result: self.identityId)
        })
    }
}

Answer 1

我相信我已经弄清楚了.我需要利用BFTask,它是为完成处理后台任务而构建的.

对于那些正在与Cognito实施开发人员身份验证的人而言,他们可能对我有类似的设置,这就是我完成它的方法:

class ExampleAppIdentityProvider: AWSAbstractCognitoIdentityProvider {
    var _token: String!
    var _logins: [ NSObject : AnyObject ]!

    // Header stuff you may not need but I use for auth with my server
    let acceptHeader = "application/vnd.exampleapp-api+json;version=1;"
    let authHeader = "Token token="
    let userDefaults = NSUserDefaults.standardUserDefaults()
    let authToken = self.userDefaults.valueForKey("authentication_token") as String

    // End point that my server gives amazon identityId and tokens to authorized users
    let url = "https://api.myapp.com/api/amazon_id/"

    override var token: String {
        get {
            return _token
        }
    }

    override var logins: [ NSObject : AnyObject ]! {
        get {
            return _logins
        }
        set {
            _logins = newValue
        }
    }

    override func getIdentityId() -> BFTask! {
        if self.identityId != nil {
            return BFTask(result: self.identityId)
        }else{
            return BFTask(result: nil).continueWithBlock({ (task) -> AnyObject! in
                if self.identityId == nil {
                    return self.refresh()
                }
                return BFTask(result: self.identityId)
            })
        }
    }

    override func refresh() -> BFTask! {
        let task = BFTaskCompletionSource()
        let request = AFHTTPRequestOperationManager()
        request.requestSerializer.setValue(self.acceptHeader, forHTTPHeaderField: "ACCEPT")
        request.requestSerializer.setValue(self.authHeader+authToken, forHTTPHeaderField: "AUTHORIZATION")
        request.GET(self.url, parameters: nil, success: { (request: AFHTTPRequestOperation!, response: AnyObject!) -> Void in
            // The following 3 lines are required as referenced here: http://stackoverflow.com/a/26741208/535363
            var tmp = NSMutableDictionary()
            tmp.setObject("temp", forKey: "ExampleApp")
            self.logins = tmp

            // Get the properties from my server response
            let properties: NSDictionary = response.objectForKey("properties") as NSDictionary
            let amazonId = properties.objectForKey("amazon_identity") as String
            let amazonToken = properties.objectForKey("token") as String

            // Set the identityId and token for the ExampleAppIdentityProvider
            self.identityId = amazonId
            self._token = amazonToken

            task.setResult(response)
        }, failure: { (request: AFHTTPRequestOperation!, error: NSError!) -> Void in
            task.setError(error)
        })
        return task.task
    }
}

并通过以下方式初始化ExampleAppIdentityProvider:

    let identityProvider = ExampleAppIdentityProvider()
    let credentialsProvider = AWSCognitoCredentialsProvider(regionType: AWSRegionType.USEast1, identityProvider: identityProvider, unauthRoleArn: GlobalVariables.cognitoUnauthRoleArn, authRoleArn: GlobalVariables.cognitoAuthRoleArn)
    let defaultServiceConfiguration = AWSServiceConfiguration(region: .USEast1, credentialsProvider: credentialsProvider)
    AWSServiceManager.defaultServiceManager().defaultServiceConfiguration = defaultServiceConfiguration

    let transferManager = AWSS3TransferManager.defaultS3TransferManager()

    let uploadRequest = AWSS3TransferManagerUploadRequest()
    uploadRequest.bucket = GlobalVariables.awsBucket
    uploadRequest.key = "\(GlobalVariables.environment)/uploads/users/\(userId)/\(type)/\(timestamp)/original.jpg"
    uploadRequest.ACL = .AuthenticatedRead
    uploadRequest.body = tmpFileUrl

    // Upload file
    let task = transferManager.upload(uploadRequest)

我创建了一个 struct名为GlobalVariables与用于保存值全局环境变量bucket,unAuthRoleArn,authRoleArn,等等.当然你不必这样做,但我提到它的情况下,有人迷茫.