read.js

console.log('Loading event');
var doc = require('dynamodb-doc');
var dynamodb = new doc.DynamoDB();

exports.handler = function(event, context, callback) {
    console.log("Request received:\n", JSON.stringify(event));
    var tableName = "jonasgroth.se_comments";
    var post = event.queryStringParameters.post;
    dynamodb.query({
        TableName : tableName,
        KeyConditionExpression: "#post = :post",
        ExpressionAttributeNames:{
            "#post": "post"
        },
        ExpressionAttributeValues: {
            ":post":post
        },
        Limit : 30
    }, function(err, data) {
        if (err) {
            context.done('error','reading dynamodb failed: '+err);
            var body = [];
        } else {
            var body = [];
            for(var item in data.Items){
                var comment = data.Items[item];
                body.push({authorName: comment.authorName, timedate: comment.timedate, commentText: comment.commentText});
            }
        }
        var httpResponse = {
            "statusCode":200,
            "headers": {
                "date": new Date().toUTCString(),
                "X-Requested-With":"*",
                "Access-Control-Allow-Headers":"Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token",
                "access-control-allow-origin":"https://jonasgroth.se",
                "access-control-allow-methods": "DELETE,GET,HEAD,OPTIONS,PATCH,POST,PUT",
                "content-type": "application/json",
                "status": 200,
                "content-length": body.length
            },
            "body": JSON.stringify(body)
        };
        console.log("Response: " + JSON.stringify(httpResponse));
        callback(null, httpResponse);
    });
};