Getting domain name from string

Terraform
1

Can I ask help with getting domain name from string please ?
For ex:
for x.domain.com I want domain.com
for x.x.domain.com I want domain.com
for *.x.domain.com I want domain.com

In short, regardless of how deep is the domain, i want to get domain.com.

Thanks.

2

Is it always going to be a domain.com type domain, or could it also be things like domain.co.uk?

3

The @stuart-c . Thanks for replying. It could be anything like domain.com, domain.us or domain.co.uk

4

Then, you cannot do this via purely algorithmic string processing.

You need to refer to the Public Suffix List: https://publicsuffix.org/

Data processing of this complexity is best performed in you own custom code before you invoke Terraform - then feed Terraform the processed data via variables or JSON/YAML files.

1 Like
5

A very simple code, which is working for Top-level domain’s and in case of the Second-level domain’s, should be updated

locals {
  input = "domain.com"
  # input = "x.domain.com"
  # input = "x.x.domain.com"
  # input = "*.x.domain.com"
  output = join(".", slice(split(".", local.input), length(split(".", local.input))-2, length(split(".", local.input))))
}

output "output" {
  value = local.output
}

Outputs:

output = "domain.com"
# output = "domain.com"
# output = "domain.com"
# output = "domain.com"