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I would like my web app to log in to AWS. I am using Eclipse JEE. The about box says:
Eclipse IDE for Enterprise Java Developers.
Version: 2019-03 (4.11.0)
Build id: 20190314-1200
I have the following code:
index.html:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<title>Hello AWS Web World!</title>
<link rel="stylesheet" href="styles/styles.css" type="text/css"
media="screen">
</head>
<body>
<h1>Post</h1>
<div>
<form action="LoginServlet" method="post">
Name:<input type="text" name="name"><br>
Password:<input type="password" name="password"><br>
<input type="submit" value="submit">
</form>
</div>
<h1>Get</h1>
<div>
<form action="LoginServlet" method="get">
Name:<input type="text" name="name"><br>
Password:<input type="password" name="password"><br>
<input type="submit" value="submit">
</form>
</div>
</body>
</html>
index.jsp
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8" %>
<%@ page import="com.amazonaws.*" %>
<%@ page import="com.amazonaws.auth.*" %>
<%@ page import="com.amazonaws.auth.profile.*" %>
<%@ page import="com.amazonaws.services.ec2.*" %>
<%@ page import="com.amazonaws.services.ec2.model.*" %>
<%@ page import="com.amazonaws.services.s3.*" %>
<%@ page import="com.amazonaws.services.s3.model.*" %>
<%@ page import="com.amazonaws.services.dynamodbv2.*" %>
<%@ page import="com.amazonaws.services.dynamodbv2.model.*" %>
<%! // Share the client objects across threads to
// avoid creating new clients for each web request
private AmazonEC2 ec2;
private AmazonS3 s3;
private AmazonDynamoDB dynamo;
%>
<%
/*
* AWS Elastic Beanstalk checks your application's health by periodically
* sending an HTTP HEAD request to a resource in your application. By
* default, this is the root or default resource in your application,
* but can be configured for each environment.
*
* Here, we report success as long as the app server is up, but skip
* generating the whole page since this is a HEAD request only. You
* can employ more sophisticated health checks in your application.
*/
if (request.getMethod().equals("HEAD")) return;
%>
<%
if (ec2 == null) {
AWSCredentialsProviderChain credentialsProvider = new AWSCredentialsProviderChain(
new InstanceProfileCredentialsProvider(),
new ProfileCredentialsProvider("default"));
ec2 = new AmazonEC2Client(credentialsProvider);
s3 = new AmazonS3Client(credentialsProvider);
dynamo = new AmazonDynamoDBClient(credentialsProvider);
}
%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<title>Hello AWS Web World!</title>
<link rel="stylesheet" href="styles/styles.css" type="text/css" media="screen">
</head>
<body>
<div id="content" class="container">
<div class="section grid grid5 s3">
<h2>Amazon S3 Buckets:</h2>
<ul>
<% for (Bucket bucket : s3.listBuckets()) { %>
<li> <%= bucket.getName() %> </li>
<% } %>
</ul>
</div>
<div class="section grid grid5 sdb">
<h2>Amazon DynamoDB Tables:</h2>
<ul>
<% for (String tableName : dynamo.listTables().getTableNames()) { %>
<li> <%= tableName %></li>
<% } %>
</ul>
</div>
<div class="section grid grid5 gridlast ec2">
<h2>Amazon EC2 Instances:</h2>
<ul>
<% for (Reservation reservation : ec2.describeInstances().getReservations()) { %>
<% for (Instance instance : reservation.getInstances()) { %>
<li> <%= instance.getInstanceId() %></li>
<% } %>
<% } %>
</ul>
</div>
</div>
</body>
</html>
LoginServlet.java
package package10_2;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@WebServlet(name="LoginServlet", urlPatterns= {"/"})
public class LoginServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("doPost");
response.setContentType("text/html");
PrintWriter out=response.getWriter();
out.println("doPost");
Boolean authenticated = request.authenticate(response);
System.out.println("authenticated=" + authenticated);
out.println("authenticated=" + authenticated);
String authType = request.getAuthType();
System.out.println("auth type =" + authType);
out.println("auth type =" + authType);
String remoteUser = request.getRemoteUser();
System.out.println("remote user =" + remoteUser);
out.println("remote user =" + remoteUser);
out.close();
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("doGet");
response.setContentType("text/html");
PrintWriter out=response.getWriter();
out.println("doGet");
String authType = request.getAuthType();
System.out.println("auth type =" + authType);
out.println("auth type =" + authType);
String remoteUser = request.getRemoteUser();
System.out.println("remote user =" + remoteUser);
out.println("remote user =" + remoteUser);
out.close();
}
}
When I use the first form that uses the post method, I put in the right username and password, but when I click on submit, I get a login dialog box that asks for a username and password. In this case the username is tina. Here is what shows on the website after:
doPost authenticated=true auth type =BASIC remote user =tina
When I use the second form that uses the get method, I put the right username and password, but when I click on submit, the website shows:
doGet auth type =null remote user =null
Should I use the post or the get method to log in? I think I'm supposed to use the get method.
How do I get the post method to work with the values for username and password I the user puts in the form in the index.html page?
275
Http GET doesn't support Form submit, you have to use JS to add them on query parameter. But It has security risks.
So usually GET is not a good method to handle login.
72
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