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package templates
import (
"encoding/json"
"errors"
"fmt"
"text/template"
)
// ValidateTemplate validates a text template results in valid JSON
// when it's executed with empty template data. If template execution
// results in invalid JSON, the template is invalid. When the template
// is valid, it can be used safely. A valid template can still result
// in invalid JSON when non-empty template data is provided.
func ValidateTemplate(data []byte, funcMap template.FuncMap) error {
if len(data) == 0 {
return nil
}
// prepare the template with our template functions
_, err := template.New("template").Funcs(funcMap).Parse(string(data))
if err != nil {
return fmt.Errorf("error parsing template: %w", err)
}
return nil
}
// ValidateTemplateData validates that template data is
// valid JSON.
func ValidateTemplateData(data []byte) error {
if len(data) == 0 {
return nil
}
if ok := json.Valid(data); !ok {
return errors.New("error validating json template data")
}
return nil
}
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