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validate.go
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/
validate.go
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package parameter
import (
"sort"
"github.com/hashicorp/hcl/v2"
"github.com/hashicorp/hcl/v2/hclsyntax"
"golang.org/x/xerrors"
)
// Contains parses possible values for a conditional.
func Contains(condition string) ([]string, bool, error) {
if condition == "" {
return nil, false, nil
}
expression, diags := hclsyntax.ParseExpression([]byte(condition), "", hcl.InitialPos)
if len(diags) > 0 {
return nil, false, xerrors.Errorf("parse condition: %s", diags.Error())
}
functionCallExpression, valid := expression.(*hclsyntax.FunctionCallExpr)
if !valid {
return nil, false, nil
}
if functionCallExpression.Name != "contains" {
return nil, false, nil
}
if len(functionCallExpression.Args) < 2 {
return nil, false, nil
}
value, diags := functionCallExpression.Args[0].Value(&hcl.EvalContext{})
if len(diags) > 0 {
return nil, false, xerrors.Errorf("parse value: %s", diags.Error())
}
possible := make([]string, 0)
for _, subValue := range value.AsValueSlice() {
if subValue.Type().FriendlyName() != "string" {
continue
}
possible = append(possible, subValue.AsString())
}
sort.Strings(possible)
return possible, true, nil
}