Solved-Assignment 2: Java Regular Expressions- Solution

Description

•Source code: CookieTest.java

Valid or invalid that is the question?

Web applications have several challenges; perhaps the most serious being thedifficultly in maintaining state information. A common solution to this issue is to use cookies as a mechanism to encode and distribute this information. However, as the cookie passes from a server to a client and back neither side can assume that the cookie is valid.

You are required to produce a Java program, which uses the regular expression to answer the question: “Is this cookie (supplied as an input) valid or not?”

For this assignment, a valid cookie is defined by these subset of rules found in RFC 6265 (HTTP State Management Mechanism), along with RFC 2616, RFC 1123, and RFC 1034. Note that only the rules in this assignment have to be implemented. A fully functional cookie checker is not required.

1 of 5 , 11:34 a.m.
Assignment https://eclass.srv.ualberta.ca/mod/assign/view.php?id…

set-cookie-header = “Set-Cookie:” SP set-cookie-string
set-cookie-string = cookie-pair *( “;” SP cookie-av )
cookie-pair = cookie-name “=” cookie-value
cookie-name = token
token = 1*
separators = “(” | “)” | “<” | “>” | “@”
| “,” | “;” | “:” | “\” | <“>
| “/” | “[” | “]” | “?” | “=”
|”{“|”}”|SP|HT
cookie-value = *cookie-octet / ( DQUOTE *cookie-octet DQUOTE )
cookie-octet = %x21 / %x23-2B / %x2D-3A / %x3C-5B / %x5D-7E
; US-ASCII characters excluding CTLs,
; whitespace DQUOTE, comma, semicolon,
; and backslash
cookie-av = expires-av / max-age-av / domain-av /
path-av / secure-av / httponly-av
expires-av = “Expires=” rfc1123-date
rfc1123-date = wkday “,” SP date1 SP time SP “GMT”
date1 = 2DIGIT SP month SP 4DIGIT
; day month year (e.g., 02 Jun 1982)
time = 2DIGIT “:” 2DIGIT “:” 2DIGIT
; 00:00:00 – 23:59:59
wkday = “Mon” | “Tue” | “Wed”
| “Thu” | “Fri” | “Sat” | “Sun”
month = “Jan” | “Feb” | “Mar” | “Apr”
| “May” | “Jun” | “Jul” | “Aug”
| “Sep” | “Oct” | “Nov” | “Dec”

max-age-av = “Max-Age=” non-zero-digit *DIGIT

non-zero-digit = %x31-39

; digits 1 through 9
domain-av = “Domain=” domain-value
domain-value =
path-av = “Path=” path-value
path-value =
secure-av = “Secure”
httponly-av = “HttpOnly”
::= | ” ”
::= | “.”
::= [ [ ] ]
::= |
::= | “-”
::= |
::= any one of the 52 alphabetic characters A through Z in upper case and a through z
::= any one of the ten digits 0 through 9

2 of 5 , 11:34 a.m.
Assignment https://eclass.srv.ualberta.ca/mod/assign/view.php?id…

Hint: to understand the definition, you may need Augmented Backus-Naur Form.

Examples/Testcases

Here are the examples of cookies (test cases, both valid and invalid) to assist you in con

HTTP/1.x 200 OK
Server: Apache-Coyote/1.1
1. Set-Cookie: ns1=”alss/0.foobar^” # name=value
2. Set-Cookie: ns1= # empty value
3. Set-Cookie: ns1=; Expires=Wed, 19 Nov 2008 16:35:39 GMT # Expires=time_stamp
4. Set-Cookie: ns1=; Domain= # empty Domain
5. Set-Cookie: ns1=; Domain=.srv.a.com-0 # Domain=host_name

6. Set-Cookie: lu=Rg3v; Expires=Wed, 19 Nov 2008 16:35:39 GMT; Path=/; Domain=.example.com; HttpOnly

7. Set-Cookie: # empty cookie-pair
8. Set-Cookie: sd # no “=”
9. Set-Cookie: =alss/0.foobar^ # empty name
10. Set-Cookie: ns@1=alss/0.foobar^ # illegal name
11. Set-Cookie: ns1=alss/0.foobar^; # trailing “;”
12. Set-Cookie: ns1=; Expires=Wed 19 Nov 2008 16:35:39 GMT # illegal Expires value
13. Set-Cookie: ns1=alss/0.foobar^; Max-Age=01 # illegal Max-Age: starting 0
14. Set-Cookie: ns1=alss/0.foobar^; Domain=.0com # illegal Domain: starting 0
15. Set-Cookie: ns1=alss/0.foobar^; Domain=.com- # trailing non-letter-digit Domain
16. Set-Cookie: ns1=alss/0.foobar^; Path= # empty Path
17. Set-Cookie: ns1=alss/0.foobar^; httponly # lower case of “HttpOnly”

Cache-Control: private

Pragma: no-cache

Content-Encoding: gzip

Content-Type: text/html;charset=UTF-8

Content-Length: 22784

Date: Tue, 18 Nov 2008 16:35:39 GMT

CookieTest.java

Submission status

Attempt number This is attempt 1 ( 1 attempts allowed ).

Submission status No attempt

Grading status Not graded

Due date Thursday, 27 September 2018, 5:00 PM

3 of 5 , 11:34 a.m.

Assignment https://eclass.srv.ualberta.ca/mod/assign/view.php?id…

Time remaining 8 days 5 hours

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ECE 325 (LEC A1 Fa18)

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