Escaping Metacharacters

Orc · 05-05-2008, 05:36 AM

I need to escape the '?' in RegEXP

Code:

RewriteRule ^image(?=this is where I want my '?')([A-Za-z0-9]+)?$ image.php?img=$1 [L]

I've tried many ways, none worked.

delayedinsanity · 05-05-2008, 06:10 AM

Using a backslash doesn't work? I escape periods in my rewrite's just like so \. with no problems. What about using QSA instead if it doesn't work? If I remember correctly you should be able to do

RewriteRule ^image$ image.php [QSA, L]

and it should work like /image?img=image.png => /image.php?img=image.png. Worst possible scenario you could do

RewriteRule ^image/([A-Z0-9]+)/?$ image.php?img=$1 [NC, L]

and site.com/image/image.png would pump it through your php file. According to this
though you should be able to escape with \... but I tried it and it wasn't working either, so I'm lost.
-m

delayedinsanity · 05-05-2008, 06:18 AM

Special escaping of quantifiers in mod_rewrite?

This may be some help too. You may have to use RewriteCond instead of just RewriteRule.
-m

Orc · 05-05-2008, 06:18 AM

Quote:

Originally Posted by delayedinsanity

Using a backslash doesn't work? I escape periods in my rewrite's just like so \. with no problems. What about using QSA instead if it doesn't work? If I remember correctly you should be able to do

RewriteRule ^image$ image.php [QSA, L]

and it should work like /image?img=image.png => /image.php?img=image.png. Worst possible scenario you could do

RewriteRule ^image/([A-Z0-9]+)/?$ image.php?img=$1 [NC, L]

and site.com/image/image.png would pump it through your php file. According to this
though you should be able to escape with \... but I tried it and it wasn't working either, so I'm lost.
-m

QSA gives me the 500 error, and NC does aswell.

delayedinsanity · 05-05-2008, 07:20 AM

Sorry, make sure there's no spaces. [QSA,L] or [NC,L]. QSA is for your query string, NC is just non case sensitive.
-m

Orc · 05-05-2008, 07:24 AM

Quote:

Originally Posted by delayedinsanity

Sorry, make sure there's no spaces. [QSA,L] or [NC,L]. QSA is for your query string, NC is just non case sensitive.
-m

Neither work, this is the same problem I get:

Code:

Not Found

The requested URL /image was not found on this server.

sjaq · 05-05-2008, 09:33 AM

How does your whole .htaccess or .conf file looks like? Can you post it here?

Orc · 05-05-2008, 09:34 AM

Quote:

Originally Posted by sjaq

How does your whole .htaccess or .conf file looks like? Can you post it here?

nothing much actually, just RewriteEngine on, with a few RewriteRule's, and that one. so yeah

sjaq · 05-05-2008, 09:37 AM

To clear things up what do you want to do exactly? It seems you want to rewrite /image/bla.jpg to /image.php?img=bla.jpg am I right?

Orc · 05-05-2008, 09:38 AM

Quote:

Originally Posted by sjaq

To clear things up what do you want to do exactly? It seems you want to rewrite /image/bla.jpg to /image.php?img=bla.jpg am I right?

no image?bla.jpg

sjaq · 05-05-2008, 09:42 AM

This works on my computer

Code:

RewriteRule ^image([A-Za-z0-9\.\_]+)?$ image.php?img=$1 [QSA,L]

Orc · 05-05-2008, 09:43 AM

Quote:

Originally Posted by sjaq

This works on my computer

Code:

RewriteRule ^image([A-Za-z0-9\.\_]+)?$ image.php?img=$1 [QSA,L]

img=$1 doesnt work, I have it where it echos, for quick testing. so yeah, doesnt work. :[ and I have mod_rewrite enabled

I want it like image?bla.jpg, not imagebla.jpg

Orc · 05-05-2008, 09:48 AM

Quote:

Originally Posted by sjaq

That's pretty strange

Just works

can you put print_r($_GET)); in your image.php file and post what happens..

o0okay
fsss

Orc · 05-05-2008, 09:50 AM

I used var_dump instead of print_r, cause its more effective, and I got this:

PHP Code:


			
string(0) ""

:S

Update: I removed QSA, now it just gives me .php

sjaq · 05-05-2008, 09:50 AM

But why don't you just use image/bla.jpg this looks much cleaner..

Orc · 05-05-2008, 09:55 AM

Quote:

Originally Posted by sjaq

But why don't you just use image/bla.jpg this looks much cleaner..

Sigh.. So let me guess, you can't find the answer?

sjaq · 05-05-2008, 09:58 AM

No it seems apache doesn't allow ?'s in their regexes, even if you pass it in as a hex it doesn't work.. and when you use / it's pretty basic..

Code:

RewriteRule ^image/([A-Za-z0-9\.\_]+)?$ image.php?img=$1 [QSA,L]

Orc · 05-05-2008, 10:00 AM

Quote:

Originally Posted by sjaq

No it seems apache doesn't allow ?'s in their regexes, even if you pass it in as a hex it doesn't work.. and when you use / it's pretty basic..

Code:

RewriteRule ^image/([A-Za-z0-9\.\_]+)?$ image.php?img=$1 [QSA,L]

Well then, thats ass.. :P they need to update that. at least make it like this \? or [\?] or whatever

sjaq · 05-05-2008, 10:05 AM

Ah I found it, when you use %3F it works, that is the hex for a ?. So that was the problem. It is just a technical restriction.. But you could fix it with php...

Code:

RewriteRule ^image$ image.php [QSA,L]

PHP Code:


			
// get all array keys
$gets = array_keys($_GET);
// check if it is a valid image (you may want to check if it exists
$img = preg_match('/[a-zA-Z0-9\.\_]+/', $gets[0])? $gets[0] : null;
// because it is a key apache replaces .'s with _'s we need to fix that
$xp = explode('_', $img);
$count = count($xp)-1;
$ext = $xp[$count];
unset($xp[$count]);
// the image
$img = implode('_', $xp) . '.' . $ext;

Salathe · 05-05-2008, 03:28 PM

I tried the following which seemed to work ok on my system:



RewriteCond %{QUERY_STRING} ^[a-z0-9]{1,20}\.(?:jpe?g|gif|png|bmp)$ [NC]

RewriteRule ^image$ img.php?img=%0 [L]

One thing to note is that your PHP file shouldn't be named the same as what comes before the query string, ie image?test.jpg should not use image.php because it appears that Apache's content negotiation gets in the way and serves up the PHP page without going through the rewrite process. Simply rename the PHP page to something else as I have in my example above, img.php