Cookies management with perl, Programming Languages

One of the main strengths of the Perl programming language are its powerful text manipulation features. In this assignment, you will put them to use for writing a Perl program that canmanage a simplified version of the so-called "browser cookies".

These are the specifications for your Perl program:

1. The file with your program must be named cookiemgr.pl

2. The program must be invoked as:

cookiemgr.pl cookies_file [options]

The program must check that its first argument exists, is a file and is readable. If not, it must print string:

Error: a valid file must be passed as first argument

To the standard output, and exit. The first argument is compulsory while the following arguments are optional. The arguments are described in the following.

3. File cookies_file can have any arbitrary name. It must be a file of text with the followingformat:

a. The file consists of an arbitrary number of lines (including, possibly, zero lines).

b. Each line must contain four fields separated by commas.

c. The four fields are: cookie name, cookie value, hostname and expiry date.

d. The first three fields are strings of arbitrary (yet reasonably limited) length; thecharacters in these strings can be any of: uppercase letters, lowercase letters,decimal digits, the underscore and the dot.

e. The expiry date field is a string of decimal digits in the so-called Unix epochformat.

The following example is the ultimate specification for the format of file cookies_file:

SessionID,029380,xyz.org.au,1385874000

ASPX_ANONYMOUS,CjnjrB,xyz.org.au,1356912000

SESSION_COLOUR,red,nosite.com.au,1341014400

SESSION_ACTIVE,FALSE,nosite.com.au,1341014400

username001,massimo.piccardi,hello.uts.edu.au,2145830400

username012,john.smith,hello.uts.edu.au,2145830400

username013,michael.zhang,hello.uts.edu.au,2145830400

Important note: your program does not need to verify that file cookies_filecomplies with the format specifications. You can simply assume that the file meets all the specifications given abov.

 Your program can be invoked without any options. In this case, it must only print thefollowing string:

Found cookies

Example with the example cookies_filegiven above:

Command line:

cookiemgr.pl cookies_file

Output:

Found 7 cookies

In the case in which file cookies_fileis empty, your program must instead only print:

No cookies found

5. Your program can be invoked with option: -h hostname. In this case, it must only print thefollowing string:

Found cookies for host

Example with the example cookies_filegiven above:

Command line:

cookiemgr.pl cookies_file-h nosite.com.au

Output:

Found 2 cookies for host nosite.com.au

Option -h hostname can only be used once per command line (you can only ask for thecookies of one host at a time).

In the case in which file cookies_filecontains no cookies for the given hostname, your program must instead only print:

No cookies found for host

Example with the example cookies_filegiven above:

Command line:

cookiemgr.pl cookies_file-h feit.uts.edu.au

Output:

No cookies found for host feit.uts.edu.au

 Your program can be invoked with option: -d date, where date is entered in dd/mm/yyyyformat. In this case, it must only print the following string:

Found cookies expiring before or on

format>

To find the cookies expiring before, or on, the date given in the option, your program must  convert this date to the Unix epoch format and compare it with the dates stored in cookies_file. The time of the date is always set to be midnight (i.e. 0 hours, 0 minutes, 0 seconds). Perl has functions for converting a date to the Unix epoch format.

Example with the example cookies_filegiven above:

Command line:

cookiemgr.pl cookies_file-d 31/12/2012

The Unix epoch format for 31/12/2012, midnight, is 1356912000. In file cookies_filethereare three dates which are smaller or equal than 1356912000. Therefore, the output must be:

Found 3 cookies expiring before or on 31/12/2012

Option -d date can only be used once per command line (you can only ask for the cookies  for a given date at a time).

In the case in which file cookies_filecontains no cookies expiring before or on the given       date, your program must instead only print:

No cookies found expiring before or on

Example with the example cookies_filegiven above:

Command line:

cookiemgr.pl cookies_file-u 31/05/2010

The Unix epoch format for 31/05/2010, midnight, is 1275264000. In file cookies_filethere   are no dates which are smaller or equal than 1275264000. Therefore, the output must be:

No cookies found expiring before or on 31/05/2010

Your program can be invoked with option: -s. In this case, it must only print your name,surname and student ID in a format of your choice.

The options cannot be used simultaneously. This means that your program can only beinvoked in the following way: 1) with no options; 2) with option -u username; 3) withoption -d date; 4) with option -s.

If your program is invoked with a valid first argument, but any other syntax than whatspecified above, it must only print the following string to the standard output:

Invalid syntax/options

Example:

Command line:

cookiemgr.pl cookies_fileUTS.txt -v

Output:

Invalid syntax/options

Posted Date: 3/18/2013 2:55:00 AM | Location : United States







Related Discussions:- Cookies management with perl, Assignment Help, Ask Question on Cookies management with perl, Get Answer, Expert's Help, Cookies management with perl Discussions

Write discussion on Cookies management with perl
Your posts are moderated
Related Questions
In this Project your task is to create a program that displays various levels of the fractal structure of the so called square shaped Sierpinski-carpet. The display of level 4 is s

Windows XP using C# load a binary file and send it thru a USB port to the USB port of STM32. STM32 received the file and then write it into an I2C EEPROM.

Hi, Can you do exercises: D2, D3, D4, and D5 on page 230 of the following book: http://www.daimi.au.dk/~bra8130/Wiley_book/wiley.html . The book can be downloaded for free from t

A Consultant Dietician provides diet and nutritional advice to clients. A client's diet requires that all the food s/he eats come from one of the four "basic food groups" (chocolat

Return a new picture with each pixel''s color values made up of 80% of the color values of the corresponding pixel in the first picture and 20% of the color values of the

Write a Fortran LOGICAL FUNCTION, called "is_prime", which determines if a given integer value is a prime number or not (A prime number is a natural number which has only two disti

What is URL describe theri protocol? URL basicallt stands for uniform resource locator. A URL is a pointer to a particular resource on the Internet at a particular location.

As an XML expert you are required to model a system for an online bookshop. After an interview with the shop manager you have the following information: The detail of th

Real Distinct Eigenvalues Under this case we'll have the real, distinct eigenvalues l 1 ≠l 2 ≠l 3 a and their related eigenvectors, ?h 1 , ?h 2 and  ?h 3   are guarantee

1. You are working as a designer for a university that offers a program in Computer Science. One of the tracts is computer security. One of your colleagues has recommended adding a