htaccess query string redirect

Question

Ok so I have a url like this:

http://example.com/admin/test.php?action=edit&id=2

However I need to add in a rule to redirect this to another url with a query string like this:

http://example.com/admin/login.php?redirect=test.php%3Faction%3Dedit%26id%3D2

I added a rule like this:

RewriteRule ^admin/(.*)?$ /login.php?redirect=/admin/$1?%{QUERY_STRING} [R,L]

And it works for the most part but there is one problem, the query string is not being escaped so it is thinking those are other $_GET variables. It looks like this:

http://example.com/admin/login.php?redirect=test.php%3Faction=edit&id=2

So the redirect is reading as test.php?action=edit. It is missing the id=2 because it is reading it as another $_GET variable instead of part of the $_GET['redirect'].

Is it possible to escape the %{QUERY_STRING} ? I have googled everything I can think of and cannot find an answer anywhere.

where are you redirecting because you might want to add something like location("header: login.php? " . encodeuri(current url)); to your page that does the redirect. Then if redirect parameter is sent and login is ok use header decodeuri(redirect) — Class
– Class, Commented Jul 9, 2013 at 22:39
I dont have the option to do this. I am working in wordpress and it is coming in an email that is automatically sent. So it sends that url but I need to redirect it to login with the redirect as a parameter. — ngreenwood6
– ngreenwood6, Commented Jul 9, 2013 at 22:45

Jon Lin · Accepted Answer · 2013-07-10 00:06:48Z

1

Well, if you don't mind having a bunch of &'s at the end of your encoded URL, you can use optional captures and encode the & by hand. Something like:

RewriteCond %{QUERY_STRING} ^([^&]+)(?:&(.*)|)$
RewriteRule ^admin/(.*)?$ /login.php?redirect=/admin/$1\%3F%1\%26%2 [L,NE,R]

So if you go to:

http://example.com/admin/test.php?a=1&b=2

you get redirected to:

http://example.com/login.php?redirect=/admin/test.php%3Fa=1%26b=2

However, going to:

http://example.com/admin/test.php?a=1

will redirect you to:

http://example.com/login.php?redirect=/admin/test.php%3Fa=1%26

and your php script will extract the $_GET['redirect'] parameter as: /admin/test.php?a=1&. As long as you don't mind having that stray ampersand at the end.

If you have a lot of possible variables, and don't care about the ampersand, just add more (?:&(.*)|) to the end of the querystring condition and match them with backreferences (example, 4):

RewriteCond %{QUERY_STRING} ^([^&]+)(?:&(.*)|)(?:&(.*)|)(?:&(.*)|)$
RewriteRule ^admin/(.*)?$ /login.php?redirect=/admin/$1\%3F%1\%26%2\%26%3\%26%4 [L,NE,R]

answered Jul 10, 2013 at 0:06

Jon Lin

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1 Comment

ngreenwood6 Over a year ago

Thanks for the response but I am unsure of how many can be in there. There might even be none. I was hoping there was a bit of a cleaner solution for this.

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