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input.go
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input.go
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// Copyright 2019 Hyperscale. All rights reserved.
// Use of this source code is governed by a MIT
// license that can be found in the LICENSE file.
package filter
import (
"fmt"
"net/url"
)
// InputValue type.
type InputValue map[string]interface{}
// InputFilter interface.
type InputFilter interface {
FilterMap(input map[string]interface{}) (map[string]interface{}, error)
FilterValues(input url.Values) (url.Values, error)
}
type inputFilter struct {
filters map[string][]Filter
}
// NewInputFilter constructor.
func NewInputFilter(filters map[string][]Filter) InputFilter {
return &inputFilter{
filters: filters,
}
}
func (f inputFilter) filterField(key string, value Value) (Value, error) {
filters, ok := f.filters[key]
if !ok {
return value, nil
}
val := value
var err error
for _, filter := range filters {
val, err = filter.Filter(val)
if err != nil {
return val, fmt.Errorf("apply filter: %w", err)
}
}
return val, nil
}
func (f inputFilter) FilterMap(input map[string]interface{}) (map[string]interface{}, error) {
for key, val := range input {
val, err := f.filterField(key, val)
if err != nil {
return input, fmt.Errorf("apply filter: %w", err)
}
input[key] = val
}
return input, nil
}
func (f inputFilter) filterFieldValues(key string, values []Value) ([]Value, error) {
filters, ok := f.filters[key]
if !ok {
return values, nil
}
retvals := make([]Value, len(values))
for i, value := range values {
val := value
var err error
for _, filter := range filters {
val, err = filter.Filter(val)
if err != nil {
return retvals, fmt.Errorf("apply filter: %w", err)
}
retvals[i] = val
}
}
return retvals, nil
}
func (f inputFilter) castSliceStringToSliceValue(values []string) []Value {
retvals := make([]Value, len(values))
for i, val := range values {
retvals[i] = val
}
return retvals
}
func (f inputFilter) castSliceValueToSliceString(values []Value) []string {
retvals := make([]string, len(values))
for i, val := range values {
switch v := val.(type) {
case string:
retvals[i] = v
default:
retvals[i] = fmt.Sprintf("%v", val)
}
}
return retvals
}
func (f inputFilter) FilterValues(values url.Values) (url.Values, error) {
for key, vals := range values {
vals, err := f.filterFieldValues(key, f.castSliceStringToSliceValue(vals))
if err != nil {
return values, fmt.Errorf("apply filter: %w", err)
}
values[key] = f.castSliceValueToSliceString(vals)
}
return values, nil
}