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Internetworking and Web-programming (IWP) (DAT2, AAL-SW2, BaIT6T)
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Write a JavaScript function at the client that can extract the input values of the registration form and return them in a JavaScript object.
Implement the client-side functionality for submitting the registration form and presenting the result
- When the submit button (“Register”) is clicked, a JavaScript function should extract the content of the form and send it as JSON object to the server at the specified resource name.
- Once the result response arrives at the client, show the output box containing the encouragement texts.
- Remember to distinguish the two cases: when fewer than three things have been registered, and when 3 or more things have been registered.
It suffices to show the encouragement as plain text output in the designated HTML placeholder.
Using .innerHTML is forbidden!
<!--
function msoCommentShow(anchor_id, com_id)
{
if(msoBrowserCheck())
{
c = document.all(com_id);
a = document.all(anchor_id);
if (null != c && null == c.length && null != a && null == a.length)
{
var cw = c.offsetWidth;
var ch = c.offsetHeight;
var aw = a.offsetWidth;
var ah = a.offsetHeight;
var x = a.offsetLeft;
var y = a.offsetTop;
var el = a;
while (el.tagName != "BODY")
{
el = el.offsetParent;
x = x + el.offsetLeft;
y = y + el.offsetTop;
}
var bw = document.body.clientWidth;
var bh = document.body.clientHeight;
var bsl = document.body.scrollLeft;
var bst = document.body.scrollTop;
if (x + cw + ah / 2 > bw + bsl && x + aw - ah / 2 - cw >= bsl )
{ c.style.left = x + aw - ah / 2 - cw; }
else
{ c.style.left = x + ah / 2; }
if (y + ch + ah / 2 > bh + bst && y + ah / 2 - ch >= bst )
{ c.style.top = y + ah / 2 - ch; }
else
{ c.style.top = y + ah / 2; }
c.style.visibility = "visible";
} } }
function msoCommentHide(com_id)
{
if(msoBrowserCheck())
{
c = document.all(com_id);
if (null != c && null == c.length)
{
c.style.visibility = "hidden";
c.style.left = -1000;
c.style.top = -1000;
} }
}
function msoBrowserCheck()
{
ms = navigator.appVersion.indexOf("MSIE");
vers = navigator.appVersion.substring(ms + 5, ms + 6);
ie4 = (ms > 0) && (parseInt(vers) >= 4);
return ie4;
}
if (msoBrowserCheck())
{
document.styleSheets.dynCom.addRule(".msocomanchor","background: infobackground");
document.styleSheets.dynCom.addRule(".msocomoff","display: none");
document.styleSheets.dynCom.addRule(".msocomtxt","visibility: hidden");
document.styleSheets.dynCom.addRule(".msocomtxt","position: absolute");
document.styleSheets.dynCom.addRule(".msocomtxt","top: -1000");
document.styleSheets.dynCom.addRule(".msocomtxt","left: -1000");
document.styleSheets.dynCom.addRule(".msocomtxt","width: 33%");
document.styleSheets.dynCom.addRule(".msocomtxt","background: infobackground");
document.styleSheets.dynCom.addRule(".msocomtxt","color: infotext");
document.styleSheets.dynCom.addRule(".msocomtxt","border-top: 1pt solid threedlightshadow");
document.styleSheets.dynCom.addRule(".msocomtxt","border-right: 2pt solid threedshadow");
document.styleSheets.dynCom.addRule(".msocomtxt","border-bottom: 2pt solid threedshadow");
document.styleSheets.dynCom.addRule(".msocomtxt","border-left: 1pt solid threedlightshadow");
document.styleSheets.dynCom.addRule(".msocomtxt","padding: 3pt 3pt 3pt 3pt");
document.styleSheets.dynCom.addRule(".msocomtxt","z-index: 100");
}
// -->
Extend the HTML of the front page using semantic markup to show as the extended front page.
- Add a complete form
with action and method as
specified
- Add three suitably labelled inputs
to
the registration form:
- Username:
a
string of 5 to 30 characters
- Good Thing
: a
string of 10
to 100 characters - Score
: a
number between 1 and
10
- Username:
- Add HTML validation
such that all inputs must be
entered and satisfies the above constraints.
- Add a placeholder output element
(initially hidden)
to contain the registration result.
Add the specified function that executes the registration.
- add a registrationDate
to the good
thing registration object
register the good thing object in
the database,
compute and return the response
object, that in addition to the registered object, includes a field storing the
goodthingsCount of good things now registered at the registration date.
Hint: There is a helper function to check whether two dates are the same date. You need to filter the database for matching username and date pairs.
Hint: A new date can be created using the constructor function
Remark: For this exercise, use the Date object as per your text book, but remark that Javascript has since been updated with a new ”Temporal” object that should replace Date in future real applications.
At the server app.js, expand the server’s API (routing) to handle the registration request.
The request processing must extract the enclosed JSON object and functions to 1) validate the client inputs, 2) based on the validated data, register the “good thing” in the database and send the JSON response (or report an error).
Show only changed/added
Hint: The supplied helper functions extractJSON (promise based), jsonResponse, reportError may be useful.
On
the server side, implement the JavaScript functions for
validating the JSON object with registration
form data
. This requires that the userName,
goodthing, and scorefields are present, sanitized, and satisfy
the same constraints as in the HTML form. Return an object that contains only validated fields.
Let's talk about Tampering attacks (the T in STRIDE). Select all correct sentences.
SSL/TLS has different mechanisms to protect against different attacks. Select all correct
Which of the following functions accepts a number, and returns a Promise that will fulfill, either immediately or after a delay, into the input number + 1?