Initial QSfera import

Server/vendor/github.com/open-policy-agent/opa/v1/topdown/template.go

@@ -0,0 +1,45 @@
+package topdown
+
+import (
+	"bytes"
+	"strings"
+	"text/template"
+
+	"github.com/open-policy-agent/opa/v1/ast"
+	"github.com/open-policy-agent/opa/v1/topdown/builtins"
+)
+
+func renderTemplate(_ BuiltinContext, operands []*ast.Term, iter func(*ast.Term) error) error {
+	preContentTerm, err := builtins.StringOperand(operands[0].Value, 1)
+	if err != nil {
+		return err
+	}
+
+	templateVariablesTerm, err := builtins.ObjectOperand(operands[1].Value, 2)
+	if err != nil {
+		return err
+	}
+
+	var templateVariables map[string]any
+
+	if err := ast.As(templateVariablesTerm, &templateVariables); err != nil {
+		return err
+	}
+
+	tmpl, err := template.New("template").Parse(string(preContentTerm))
+	if err != nil {
+		return err
+	}
+
+	var buf bytes.Buffer
+	if err := tmpl.Execute(&buf, templateVariables); err != nil {
+		return err
+	}
+
+	res := strings.ReplaceAll(buf.String(), "<no value>", "<undefined>")
+	return iter(ast.StringTerm(res))
+}
+
+func init() {
+	RegisterBuiltinFunc(ast.RenderTemplate.Name, renderTemplate)
+}