Allow users to insert images securely

S33ker posted this at 20:47 — 30th August 2009.

Joined: Jun 2008

Hey all,

Basically I am developing a custom CMS and forum etc. I want to be able to allow users to posts imgs in their signature and posts etc, as many forums and CMS's do. I was wondering if there are any precautions I can take. Also is there any way to stop a user posting a huge image to disfigure everything?

They will be able to post images in the usual BBcode fashion. [img=htt://www.imagelocation.com][/img]

Any help would be greatly appreciated.

Thanks a lot.

S33ker.

mortjony posted this at 04:53 — 31st August 2009.

They have: 2 posts

Joined: Aug 2009

yes you can set image width and height that user can't insert image more than your mentioned width and height and you can also specify image size.

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S33ker posted this at 17:12 — 31st August 2009.

They have: 38 posts

Joined: Jun 2008

How would that be done then?

So far when a user inserts an image into a posts they click the IMG button and it asks for the image URL. this is then stored in the database as [img=htt://www.imagelocation.com][/img]. When the posts is displayed some PHP transforms the "[img=htt://www.imagelocation.com][/img]" into actual HTML to output the image.

Could I set a class on this image HTML to restrict size? or is there another way to do this?

Thanks,

S33ker.

webwiz posted this at 18:35 — 31st August 2009.

He has: 629 posts

Joined: May 2007

You could also do what Facebook et al do - use PHP to resize the uploaded image. Here's a tutorial on image resizing to get you started: Resize/Thumbnail Images With PHP

Cordially, David
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S33ker posted this at 20:50 — 31st August 2009.

They have: 38 posts

Joined: Jun 2008

Found the solution, really simple, did not think it would work.

When then PHP code turns the BBcode [img] into HTML img tag just add a class to the image and attach the following CSS:

.postedImg {
  max-width:600px;
  max-height:600px;
}

This will then just resize the img to ensure it does not mess up the website layout.

Working Example: http://freed0m.q23.co.uk/viewThread.php?id=33

Thanks everyone!

S33ker.

S33ker posted this at 20:51 — 31st August 2009.

They have: 38 posts

Joined: Jun 2008

Is there a bug report in this forum? Just found one. If I post < i m g then it cuts the post short.

example

There is content after this:

kjim1234 posted this at 03:34 — 1st September 2009.

They have: 1 posts

Joined: Sep 2009

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