Validation of Base64 encoded image

Question

In my cakephp program, I am converting a base64 encoded image to an image and then storing it in a folder.

How can I validate this image, before conversion?

The string is like data:image/png;base64,iVBORw0KG......
(The image can be of any extension not only png.)

You want to validate the image before you convert to base64? What are you validating against, in that case? — bronzehedwick
– bronzehedwick, Commented Mar 25, 2014 at 16:39
Its an API in PHP for an IOS app.Im getting base 64 encrypted image , i just want to validate it and convert it to image and store it in a folder.Conversion working fine.How can i validate this encoded image — user3398902
– user3398902, Commented Mar 25, 2014 at 16:43

dragonfire · Accepted Answer · 2015-06-10 02:11:40Z

This answer might be useful for processing the image.
This answer might be useful for validating the image.

Code:

$data = 'data:image/png;base64,iVBORw0KG.....'; list($type, $data) = explode(';base64,', $data, 2); $data = str_replace(' ', '+', $data); $data = base64_decode($data); if (imagecreatefromstring($data) == false) { echo "invalid_image"; die(); } file_put_contents('/storage/folder/image.png', $data);

You might also want to restrict file types.

You must keep in mind that you can't simply trust any of the data sent from the client (like 'data:image/png'), so you must rely on other means (some php functions).

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