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normalization.go
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normalization.go
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package signing
import (
"encoding/json"
"github.com/mandelsoft/goutils/errors"
)
type null struct{}
func (n *null) IsEmpty() bool {
return true
}
func (n *null) Marshal(gap string) ([]byte, error) {
return json.Marshal(nil)
}
func (n *null) ToString(gap string) string {
return n.String()
}
func (n *null) String() string {
return "null"
}
func (n *null) Formatted() string {
return n.String()
}
func (n *null) Append(normalized Normalized) {
panic("append on null")
}
func (n *null) Value() interface{} {
return nil
}
func (n *null) SetField(name string, value Normalized) {
panic("set field on null")
}
var Null Normalized = (*null)(nil)
func PrepareNormalization(n Normalization, v interface{}, excludes ExcludeRules) (Normalized, error) {
data, err := json.Marshal(v)
if err != nil {
return nil, err
}
var raw map[string]interface{}
err = json.Unmarshal(data, &raw)
if err != nil {
return nil, err
}
return prepareStruct(n, raw, excludes)
}
func Prepare(n Normalization, v interface{}, ex ExcludeRules) (r Normalized, err error) {
if m, ok := ex.(ValueMappingRule); ok {
v = m.MapValue(v)
}
switch e := v.(type) {
case map[string]interface{}:
r, err = prepareStruct(n, e, ex)
case []interface{}:
r, err = prepareArray(n, e, ex)
default:
return n.NewValue(v), nil
}
if err != nil {
return r, err
}
if f, ok := ex.(NormalizationFilter); ok {
return f.Filter(r)
}
return r, err
}
func prepareStruct(n Normalization, v map[string]interface{}, ex ExcludeRules) (Normalized, error) {
entries := n.NewMap()
for key, value := range v {
name, mapped, prop := ex.Field(key, value)
if name != "" {
nested, err := Prepare(n, mapped, prop)
if err != nil {
return nil, errors.Wrapf(err, "field %q", key)
}
if nested != nil {
if nested == Null {
entries.SetField(name, nil)
} else {
entries.SetField(name, nested)
}
}
}
}
return entries, nil
}
func prepareArray(n Normalization, v []interface{}, ex ExcludeRules) (Normalized, error) {
entries := n.NewArray()
for index, value := range v {
exclude, mapped, prop := ex.Element(value)
if !exclude {
nested, err := Prepare(n, mapped, prop)
if err != nil {
return nil, errors.Wrapf(err, "entry %d", index)
}
if nested != nil {
entries.Append(nested)
}
}
}
return entries, nil
}
func Normalize(n Normalization, v interface{}, ex ExcludeRules) ([]byte, error) {
entries, err := PrepareNormalization(n, v, ex)
if err != nil {
return nil, err
}
return entries.Marshal("")
}