forked from ebhomengo/niki
90 lines
1.8 KiB
Go
90 lines
1.8 KiB
Go
// Copyright 2016 Qiang Xue. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package validation
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import (
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"encoding/json"
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"fmt"
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"sort"
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)
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type (
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// Errors represents the validation errors that are indexed by struct field names, map or slice keys.
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Errors map[string]error
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// InternalError represents an error that should NOT be treated as a validation error.
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InternalError interface {
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error
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InternalError() error
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}
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internalError struct {
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error
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}
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)
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// NewInternalError wraps a given error into an InternalError.
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func NewInternalError(err error) InternalError {
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return &internalError{error: err}
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}
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// InternalError returns the actual error that it wraps around.
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func (e *internalError) InternalError() error {
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return e.error
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}
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// Error returns the error string of Errors.
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func (es Errors) Error() string {
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if len(es) == 0 {
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return ""
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}
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keys := []string{}
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for key := range es {
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keys = append(keys, key)
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}
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sort.Strings(keys)
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s := ""
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for i, key := range keys {
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if i > 0 {
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s += "; "
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}
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if errs, ok := es[key].(Errors); ok {
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s += fmt.Sprintf("%v: (%v)", key, errs)
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} else {
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s += fmt.Sprintf("%v: %v", key, es[key].Error())
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}
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}
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return s + "."
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}
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// MarshalJSON converts the Errors into a valid JSON.
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func (es Errors) MarshalJSON() ([]byte, error) {
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errs := map[string]interface{}{}
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for key, err := range es {
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if ms, ok := err.(json.Marshaler); ok {
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errs[key] = ms
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} else {
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errs[key] = err.Error()
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}
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}
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return json.Marshal(errs)
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}
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// Filter removes all nils from Errors and returns back the updated Errors as an error.
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// If the length of Errors becomes 0, it will return nil.
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func (es Errors) Filter() error {
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for key, value := range es {
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if value == nil {
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delete(es, key)
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}
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}
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if len(es) == 0 {
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return nil
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}
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return es
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}
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