Skooma input validator - validation

Question

I was given a task to implement an input validator with the Skooma library https://github.com/bobfp/skooma#validators
The general concept is pretty clear, but for some inputs I have a list of "legal" words, and I have zero clue on how to implement the validation for this case.
Hence why I came here, I wanted to ask if you know any examples / projects that used this library? I googled but didn't find anything.
Of if you have any other tipps just let me know! 🙂
This is the example:
my schema:
schema = %{
:titel => :string,
:category => :string,
:high_level_category => :string,
:description => :string,
:potential_impacts => :string,
:affected_assets => :string,
:rating => :string }
The legal inputs for category:
category = %{core: 'Core network threats', access: 'Access network threats', multi: 'Multi edge computing threats',
virtualisation: 'Virtualisation threats', phyiscal: 'Physical infrastructure threats', generic: 'Generic threats'}
I tried it with a normal list as well, such as
category = ['Core network threats', 'Access network threats', 'Multi edge computing threats' .......]
But I just cant get my head around how to check if the :category is present in the category list.

Answer 1

You need a custom validator function, here's an example:
alias Skooma.Validators
#valid_categories [
"Access network threats",
"Core network threats",
"Generic threats",
"Multi edge computing threats",
"Physical infrastructure threats",
"Virtualisation threats"
]
def valid?(data), do: Skooma.valid?(data, schema())
defp schema,
do: %{
:category => [:string, inclusion(#valid_categories)],
... # rest of the schema
}
# copied from:
# https://github.com/bobfp/skooma/blob/master/lib/validators.ex#L38-L48
defp inclusion(values_list) when is_list(values_list) do
fn data ->
bool = data in values_list
if bool do
:ok
else
{:error, "Value is not included in the options: #{inspect(values_list)}"}
end
end
end
You can replace the inclusion function with Validators.inclusion/1. In this case, you'll need to install Skooma from Github because it has not been published as speaking today (31 Jan 2022).