Swift:仅Twitter应用程序的身份验证



我正在构建一个应用程序,其中包含对我所在城市的某些商店的引用。现在,我想在每个商店的详细信息中插入一张带有商店帐户中最后3或5条推文的桌子。

我不想使用第三方解决方案。

阅读Twitter的文档,我知道,要使用我必须对应用程序进行身份验证的其余服务,因此我已经注册了该应用程序并请求使用"仅读取"选项的访问令牌,并在这里开始问题。

每当我将"身份验证错误"作为响应时,我将无法访问休息服务。

Twitter网站上的文档在这里:https://developer.twitter.com/en/docs/basics/authentication/authentication/overview/application-anly-nolly

其中描述了仅应用程序auth的三个步骤:

  1. 编码消费者密钥和秘密
  2. 获取一个携带者令牌
  3. 用携带者令牌身份验证API请求

我在这里寻找解决方案:

  • 使用Swift
  • 访问Twitter
  • Twitter友谊/创建API要求在Swift中进行身份验证
  • 用Twitterkit在Swift中解析Twitter API搜索响应

然后在Google上发现了这一点:http://rshankar.com/retrieve-list-of-twitter-followers-using-swift/

这是我的尝试:

1。首先,我创建了func来编码consumer_key和consumer_secret

    let consumerKey = "xxxxxxxxxxxxxxxx"
    let consumerSecret = "xxxxxxxxxxxxxxxx"
    let authUrl = "https://api.twitter.com/oauth2/token"
    func getBase64EncodeString() -> String {
        let consumerKeyRFC1738 = consumerKey.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed)
        let consumerSecretRFC1738 = consumerSecret.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed)
        let concatenateKeyAndSecret = consumerKeyRFC1738! + ":" + consumerSecretRFC1738!
        let secretAndKeyData = concatenateKeyAndSecret.data(using: String.Encoding.ascii, allowLossyConversion: true)
        let base64EncodeKeyAndSecret = secretAndKeyData?.base64EncodedString(options: NSData.Base64EncodingOptions())
        return base64EncodeKeyAndSecret!
    }

2。然后获取BearerToken

的功能
    func getBearerToken(completion:@escaping (_ bearerToken: String) -> Void) {
    var request = URLRequest(url: URL(string: authURL)!)
    request.httpMethod = "POST"
    request.addValue("Basic " + getBase64EncodeString(), forHTTPHeaderField: "Authorization")
    request.addValue("application/x-www-form-urlencoded;charset=UTF-8", forHTTPHeaderField:"Content-Type")
    let grantType = "grant_type=client_credentials"
    request.httpBody = grantType.data(using: String.Encoding.utf8, allowLossyConversion:  true)
    URLSession.shared.dataTask(with: request, completionHandler: { (data: Data?, response:URLResponse?, error: NSError?) -> Void in
        do {
            if let results: NSDictionary = try JSONSerialization .jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments  ) as? NSDictionary {
                if let token = results["access_token"] as? String {
                    completion(token)
                } else {
                    print(results["errors"]!)
                }
            }
        } catch let error as NSError {
            print(error.localizedDescription)
        }
        } as! (Data?, URLResponse?, Error?) -> Void).resume()
}

3。最后,用携带者令牌

对API请求进行身份验证
    func getResponseForRequest(url:String) {
      var results:NSDictionary
      getBearerToken(completion: { (bearerToken) -> Void in
        var request = URLRequest(url: URL(string: url)!)
        request.httpMethod = "GET"
        let token = "Bearer " + bearerToken
        request.addValue(token, forHTTPHeaderField: "Authorization")
        URLSession.shared .dataTask(with: request, completionHandler: { (data: Data?, response:URLResponse?, error: NSError?) -> Void in
            self.processResult(data!, response: response!, error: error)
            } as! (Data?, URLResponse?, Error?) -> Void).resume()
    })
}

目前我在该行有一个消息错误:

    } as! (Data?, URLResponse?, Error?) -> Void).resume()

在GetBearerToken func中。

错误消息是:

线程1:exc_bad_instruction(code = exc_i386_invop,subcode = 0x0)

所以直到我还没有验证身份验证是否有效。

有人可以帮我吗?

使用以下:

var request = URLRequest(url: url)
    request.httpMethod = HttpMethod.POST.rawValue
    request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
    request.addValue("Basic (base64)", forHTTPHeaderField: "Authorization")
    request.httpBody = "grant_type=client_credentials".data(using: .utf8)

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