登录亚马逊获取Alexa Skills (LWA)

Question

是否有人有针对LWA和AWS Lambda的端到端解决方案？当我认为我理解了请求/响应协议时，当我试图让它工作时，我会变得更加困惑。

Answer 1

网址是：https://api.amazon.com/user/profile。您必须通过以下三种方式之一来传递XML2.0令牌:作为OAuth中的参数、作为标头上的“承载”令牌或作为XML.这里有一个链接：https://login.amazon.com/website。令牌非常长，每个亚马逊都应该进行编码。这对于URL来说可能太长了。我使用了头方法。

    public static WebClient client = new WebClient();
    public static JObject GetAmznProfile(string token)
    {
        string amznProfileHost = "https://api.amazon.com/user/profile";
        try
        {
            client.Headers.Remove("user-agent");
            client.Headers.Remove("Authorization");
            client.Headers.Add("Authorization: bearer " + token);
        }
        catch { Logger(Constants.SEVERE, "Exception caught trying to modify http headers in \"GetAmznProfile\""); }
        finally { }

        string body = GetUrl(amznProfileHost);
        if (body != null)
        {
            JObject json = JObject.Parse(body);
            return json;
        }
        else
        {
            string error = @"{'user_id':'error','name':'error','email':'error'}";
            JObject json = JObject.Parse(error);
            return json;
        }
    }

    public static string GetUrl(string url)
    {
        Logger(Constants.DEBUG, "In 'GetUrl' the URL is " + url);
        try
        {
            Stream data = client.OpenRead(url);
            StreamReader reader = new StreamReader(data);
            string body = reader.ReadToEnd();
            data.Close();
            reader.Close();

            return body;
        }
        catch (WebException e) { Logger(Constants.INFO, e.ToString() + " exception caught"); return null; }
    }

Answer 2

在我寻找这个问题的答案时，我偶然发现了这个问题。NHLIVES的回答对我来说不是小菜一碟，因为我使用的是node.js。以下代码是不完整的，并从Amazon的示例中进行了修改，但应该是没有错误的。它当然可以改进。但它对我很有效，我希望它对下一个人有用。

还有一件事，模块'request‘在Lambda中不可用，所以你必须提供它。只需在顶层创建一个压缩文件，一个包含‘index.js’和'safe-buffer‘目录的node_modules目录(从本地节点安装中复制)，然后将压缩文件上传到Amazon Lambda (在AWS Lambda中：'Code entry type'：'Upload a .zip file')。

var AWS = require('aws-sdk');
var requestlib = require('request');

exports.handler = function (request, context) {

    var whoami = async function (request) {
        var amznProfileURL = 'https://api.amazon.com/user/profile?access_token=';

        if (request.directive.header.namespace === 'Alexa.Discovery' && request.directive.header.name === 'Discover') {
            amznProfileURL += request.directive.payload.scope.token;
        } else {
            amznProfileURL += request.directive.endpoint.scope.token;
        }

        await new Promise(function(resolve, reject) {
            log("LWArequest: ", "amznProfileURL ", amznProfileURL);
            requestlib(amznProfileURL, function(error, response, body) {
                if (response.statusCode == 200) {
                    var profile = JSON.parse(body);
                    log("LWArequest: ", "user_id ", body);
                    resolve();
                } else {
                    log("LWArequest: ", "error ", "can't connect to Amazon Profile Service");
                    reject();
                }
            });
        }
        );
    }

    whoami(request);
    if (request.directive.header.namespace === 'Alexa.Discovery' && request.directive.header.name === 'Discover') {
        log("DEBUG:", "Discover request",  JSON.stringify(request));
        handleDiscovery(request, context, "");
    }

    function log(message, message1, message2) {
        console.log(message + message1 + message2);
    }

}

您应该会在CloudWatch日志文件中看到类似以下内容：

2018-07-17T23:06:28.108Z    08d795d3-8a16-11e8-b912-0f46b6510aa8    
  LWArequest: amznProfileURL https://api.amazon.com/user/profile?access_token=Atza|IwEBIP5ozi...

2018-07-17T23:06:28.409Z    08d795d3-8a16-11e8-b912-0f46b6510aa8    
  LWArequest: user_id
  {
    "user_id": "amzn1.account.A..........................A"
  }

希望能有所帮助。