Solved

Escape and URLDecode for URL passed using Ajax call

Posted on 2007-04-03
6
454 Views
Last Modified: 2008-02-01
I am using xmlhttp (Ajax) requests to call a PHP program from javascript using the GET method.

I am passing the PHP script a string as parameters which includes the characters %20.  For example, the current call to the PHP program looks like this:

phpparser.php?sqlstr=WHERE fieldname LIKE '%2007.03%' ORDER BY relid ASC

The %20 is cut off the param string when it reaches the PHP script, therefore messing up the MySQL query string I am passing.

I fooled around with escape and URLDecode, but how much of the URL needs to be escaped when using xmlhttp (Ajax) calls?  Should I use escape across the entire URL and then URLDecode in the receiving PHP script?

Thanks
0
Comment
Question by:mamuscia
  • 3
  • 2
6 Comments
 
LVL 24

Expert Comment

by:glcummins
ID: 18845832
A BIG word of caution on this:  You are opening up your script to a huge security attack. If you allow an SQL query to be passed as-is to your script and then executed, you have no way of knowing what is in the query. A malicious attacker can wreak havoc on your database with this kind of method.

A better option, if you can, is simple to pass the search term and order by term separately, and reconstruct the SQL statement in the script:

phpparser.php?value1=2007.03&orderby=relid&orderdirection=ASC
0
 

Author Comment

by:mamuscia
ID: 18846022
I have many fields that the form displays to allow a user to enter to search the database.  In my PHP script I execute a SELECT so the user is constrained to reading the DB.  There is also a check to make sure the construct of the WHERE clause is correct.  How would I encode/decode this URL?
0
 
LVL 63

Expert Comment

by:Zvonko
ID: 18847181
You have to encode the query string paramter Values only.
Like this:
"phpparser.php?sqlstr="+escape("WHERE fieldname LIKE '%2007.03%' ORDER BY relid ASC")+"&some="+escape("more parametrs");

You see?
Encoding & and = of the query string is misleading like not encoding special characters in the parameter values.




0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 63

Accepted Solution

by:
Zvonko earned 250 total points
ID: 18847189
Oh, and for decode you have not to care. That does PHP for you.

0
 

Author Comment

by:mamuscia
ID: 18847203
this works great, thanks!!
0
 
LVL 63

Expert Comment

by:Zvonko
ID: 18847252
You are welcome.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Things That Drive Us Nuts Have you noticed the use of the reCaptcha feature at EE and other web sites?  It wants you to read and retype something that looks like this.Insanity!  It's not EE's fault - that's just the way reCaptcha works.  But it is …
This article demonstrates how to create a simple responsive confirmation dialog with Ok and Cancel buttons using HTML, CSS, jQuery and Promises
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

685 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question