CNT4713 Extra Credit 1

Due Wednesday 6/1 (late: 6/2 at 6am)

Each of the following scripts is worth one point of extra credit.

Write a web server that implements a conditional GET, using the If-modified-since header. The web server only has to be able to return one file, but it must be an actual file. If the browser already has the file, only send the appropriate HTTP response to indicate that the browser already has the file. Request a port for your web server, so we can minimize the chance of students using the same port.
Modify the FTP script so that it downloads a file. First, try downloading the README.txt from the root folder. Second, list the contents of a subdirectory that has files. Third, download a file from a subdirectory.
Run the SMTP script and send a message to bytesizebook@gmail.com. Modify the script so that it includes a header named X-MC-Tags with the value of your FIU email username.
Create a web folder on ocelot named public_html in your root folder. Change the permissions to 705.
- Change the permissions on your root folder to 701 with chmod 701 ~
- Create a subfolder of public_html named cgi-bin. Change the permission to 705.
- Write a CGI script on ocelot. Save it in the cgi-bin folder. Change its permission to 705. Be sure the file has a .cgi extension, not .py. Parse all the data that is sent to the form from a browser. Display each name value pair in a sentence like "The input element with name team has the value Heat". Display the request method that was used to submit the data.
- Create a file named form.html that has two forms in it. One form uses GET, the other uses POST. The GET form should have three text elements, the POST form should have four. Both forms have an action set to your script. Place the file in public_html. Set its permissions to 604. Add a submit button in each form to submit it.
- Open the form.html file in a browser, using the URL ocelot.aul.fiu.edu/~your-user-name/form.html. Click each button and see that the appropriate response appears for each.

Deploying the Assignment

Change All Scripts to CGI Scripts

The following changes to your scripts will allow them to be run from ocelot. Replace username with your FIU email usernam and script-name with the name of the script in the following URL:

http://ocelot.aul.fiu.edu/~username/cgi-bin/script-name.cgi

Set the extension on all your scripts to .cgi
Add this statement as the first statement in the script file:
```
#!/usr/bin/python
```
If you do not have it, import the os module:
```
import os
```
Add these statements as the first executable statements in your script. They will allow you to see any errors that are generated by your script and to see all output from your script:
```
os.stderr = os.stdout
print "Content-type: text/plain\n"
```

Limiting Access to `cgi-bin`

We do not want other people (like hackers) to run your scripts (over and over again).

Add a file named .htaccess to the cgi-bin folder
Set the permissions on the file to 705:
```
chmod 604 .htaccess
```
Include the following in the .htaccess file, replacing your-fiu-username with your FIU username. Be very careful with this file. If you make a mistake, you will generate a 500 error.
```
AuthType Basic
AuthName "your-fiu-username cgi-bin access"
AuthUserFile  /aul/homes/downeyt/etc/1605/registered.passwd
Require user downeyt your-fiu-username
```
Use the password that I sent the other day to access your scripts from a browser.

Creating an Index Page in `public_html`

I want to be able to run your scripts on ocelot, without having to type the name of each script in the URL.

Create a file named index.html in the public_html folder.
Use my index page as a reference: Index Page.
you may copy the source of my page and modify it with your name and the names of your scripts.

Submitting the Assignment

To hand in the assignment, place all your scripts in the cgi-bin folder on ocelot. Zip the public_html folder, including the cgi-bin folder. DO NOT USE 7-ZIP or RAR!!!

Please use the following command to your public_html folder.
zip -r ~/username ~/public_html -x \*.zip
Replacing username with your user name. This will create a file named username.zip.
Check the size of the ZIP file, it should be less than 3 MB. If it is not, then you probably have another ZIP file stored in the ZIP archive. Delete it and re-zip.
You then have a choice for submitting the file.
- If you are logged onto ocelot, use my uploading program to upload the file. Enter this command at the command prompt:
  ~downeyt/cs/public/webftp/webftp.pl
- If you are using winscp, then download the zip file to your computer; then, upload the file to me: Submitting homework on-line via the Web.
Upload the file as binary.