Cloudimage - Documentation

URL signature

To prevent URL tampering and protect your token, every Cloudimage URL can be secured with an SHA-1 HMAC signature.

Please be aware that when URL signature is activated for your token, all Cloudimage URLs which are not signed properly will cease to work.

The signature is calculated as follows:

Signature = sha1('Salt' + 'URI') where URI = original_image_url?operations&filters

The syntax to process an image is:

//token.cloudimg.io/original_image_url?operations&filters&ci_sign=Signature

Because the Salt is a shared secret between you and Cloudimage, only you will be able to calculate the signature of your images.

Contact us to enable the signature and set up the Salt for your company token.