AWS SNS webservice订阅 - 表达问题,sinatra示例

时间:2012-02-28 21:32:27

标签: javascript node.js amazon-web-services express amazon-sns

我只是想构建一个自动订阅API,用于POST回令牌。我可以在Sinatra中轻松完成这项工作(从AWS渲染POST的JSON) - 似乎在Express中遇到了困难;虽然我已经尝试了1000X组合,但我确定这只是一些我不知道的愚蠢。

这是Sinatra网络服务器:

# application.rb

require 'rubygems'
require 'sinatra'
require 'json'

set :port, 8081

post '/webservice/cloudwatch' do
  content_type :json
  puts "Body: " + request.body.read
end

哪些日志:

- -> /webservice/cloudwatch
Body: {
  "Type" : "SubscriptionConfirmation",
  "MessageId" : "OMIT",
  "Token" : "OMIT",
  "TopicArn" : "OMIT",
  "Message" : "OMIT",
  "SubscribeURL" : "OMIT",
  "Timestamp" : "2012-02-28T21:28:02.082Z",
  "SignatureVersion" : "1",
  "Signature" : "OMIT",
  "SigningCertURL" : "OMIT"
}

以下是Express网络服务器:

var express, app, stache;
express = require("express"), app = express.createServer();
app.configure(function () {
  app.use(express.methodOverride());
  app.use(express.bodyParser());
  app.use(app.router);
  app.set("view options", {
    layout: false
  });
  app.use(express.errorHandler({
    dumpExceptions: true,
    showStack: true
  }));
});
app.post("/webservice/cloudwatch", function (request, response) {
  request.accepts('application/json');
  console.log("post body: " + JSON.stringify(request.params));
  console.log("post body: " + JSON.stringify(request.body.read));
});  
app.listen(8081);

哪些日志:

post body: []
post body: undefined

请帮忙!

3 个答案:

答案 0 :(得分:2)

您使用哪个请求来测试您的网络服务?做:

curl -H "Content-Type: application/json" -d '{"Type":"SubscriptionConfirmation","MessageId":"OMIT","Token":"OMIT","TopicArn":"OMIT","Message":"OMIT","SubscribeURL":"OMIT","Timestamp":"2012-02-28T21:28:02.082Z","SignatureVersion":"1","Signature":"OMIT","SigningCertURL":"OMIT"}' http://localhost:8081/webservice/cloudwatch

(注意设置为application / json的内容类型)并将console.log更改为console.log(request.body);应该会给您预期的结果。 bodyParser方法需要知道content-type才能正确填充request.body。

答案 1 :(得分:2)

当amazon将http post请求发送到您的端点时,它不会指定内容类型。根据他们的回答,这是他们已知的问题。

与此同时,我一直在测试一个非常糟糕的解决方法。我在express插件中修改了bodyParser.js文件。具体来说,我在mime函数中添加了if检查,以便我可以根据需要强制它假装内容类型为application/json

这是修改后的mime函数:

function mime(req) {
    if(req.headers['x-amz-sns-message-type'] == 'SubscriptionConfirmation' && !req.headers.hasOwnProperty['content-type']) {
        req.headers['content-type'] = 'application/json';
    }

    var str = req.headers['content-type'] || '';
    return str.split(';')[0];
}

答案 2 :(得分:0)

将以下内容添加到您的快速服务器(确保bodyParser位于rawbody之后)。尝试记录request.rawbody

var rawbody = function(req, res, next) {
    var data = '';
    req.setEncoding('utf8');
    req.on('data', function(chunk) {
        data += chunk;
    });
    req.on('end', function() {
    req.rawBody = data;
        next();
    });
};

app.use(rawbody);
app.use(express.bodyParser());

感谢:Expressjs raw body