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sanitizer.go
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sanitizer.go
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package cfg
import (
"fmt"
"reflect"
"time"
)
type Sanitizer func(in interface{}) (interface{}, error)
func Sanitize(key string, value interface{}, sanitizers []Sanitizer) (interface{}, error) {
switch val := value.(type) {
case []interface{}:
return sanitizeSlice(key, val, sanitizers)
case map[string]interface{}:
return sanitizeMap(key, val, sanitizers)
default:
return sanitizeValue(key, val, sanitizers)
}
}
func sanitizeValue(key string, val interface{}, sanitizers []Sanitizer) (interface{}, error) {
var err error
san := val
for _, sanitizer := range sanitizers {
if san, err = sanitizer(san); err != nil {
return nil, fmt.Errorf("can not apply sanitizer on key %s: %w", key, err)
}
}
return san, nil
}
func sanitizeSlice(key string, values []interface{}, sanitizers []Sanitizer) ([]interface{}, error) {
var err error
var san interface{}
for i, val := range values {
k := fmt.Sprintf("%s.%d", key, i)
if san, err = Sanitize(k, val, sanitizers); err != nil {
return nil, fmt.Errorf("can not sanitize slice element %s of type %T: %w", k, val, err)
}
values[i] = san
}
return values, nil
}
func sanitizeMap(rootKey string, values map[string]interface{}, sanitizers []Sanitizer) (map[string]interface{}, error) {
var err error
var san interface{}
for key, val := range values {
k := fmt.Sprintf("%s.%s", rootKey, key)
if san, err = Sanitize(k, val, sanitizers); err != nil {
return nil, fmt.Errorf("can not sanitize map element %s of type %T: %w", k, val, err)
}
values[key] = san
}
return values, nil
}
func TimeSanitizer(in interface{}) (interface{}, error) {
if reflect.TypeOf(in) != reflect.TypeOf(time.Time{}) {
return in, nil
}
tm := in.(time.Time)
return tm.Format(time.RFC3339), nil
}