It happens that I want to provide access or functionality based on if the visitor comes from a certain IP number. As long as it’s a single IP address or a single IP subnet that is easy in Lasso 9.
client_ip == '127.*’ is perfectly valid and will return true if I access a local install of Lasso.
client_ip == '65.136.211.*’works equally well. Client_ip accepts wildcards when comparing.

But in my case it is often a question of accepting a range of different IP ranges. To help with that I wrote a method called client_ip_isin. It will accept an array, or staticarray, of strings and return true if any of the strings match client_ip.

I’ve put it as a gist found here:
https://gist.github.com/jolle-c/29bb9e8a0dff718de930

Code looks like this:

/**!
client_ip_isin
Will return true if client_ip matches any of the strings in the provided staticarray

Examples
client_ip_isin((: '127.*', '91.219.213.*'))

2014-09-10 JC First version

*/
define client_ip_isin(check::staticarray) => {

with item in #check do {
client_ip == #item ? return true
}
return false
}

define client_ip_isin(check::array) => {

with item in #check do {
client_ip == #item ? return true
}
return false
}

Feel free to use or abuse.

HDB
Jolle

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