/
validator.go
91 lines (77 loc) · 2.63 KB
/
validator.go
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// Copyright 2017-2023 The sacloud/usacloud Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package validate
import (
"fmt"
"strings"
"github.com/go-playground/validator/v10"
"github.com/sacloud/usacloud/pkg/naming"
"github.com/sacloud/usacloud/tools/clitag"
)
var validate = validator.New()
func Exec(parameter interface{}) error {
err := validate.Struct(parameter)
if err != nil {
// see https://github.com/go-playground/validator/blob/f6584a41c8acc5dfc0b62f7962811f5231c11530/_examples/simple/main.go#L59-L65
if _, ok := err.(*validator.InvalidValidationError); ok {
return err
}
var errs []error
for _, err := range err.(validator.ValidationErrors) {
errs = append(errs, errorFromValidationErr(parameter, err))
}
return NewValidationError(errs...)
}
return nil
}
func NewValidationError(errs ...error) error {
if len(errs) == 0 {
return nil
}
var errStrings []string
for _, err := range errs {
errStrings = append(errStrings, "\t"+err.Error())
}
return fmt.Errorf("validation error:\n%s", strings.Join(errStrings, "\n"))
}
func NewFlagError(flagName, message string) error {
return fmt.Errorf("%s: %s", flagName, message)
}
func errorFromValidationErr(parameter interface{}, err validator.FieldError) error {
flagName := flagName(parameter, err)
param := err.Param()
detail := err.ActualTag()
if param != "" {
detail += "=" + param
}
// detailがvalidatorのタグ名だけの場合の対応をここで行う。
if detail == "file" {
detail = fmt.Sprintf("invalid file path: %v", err.Value())
}
return NewFlagError(flagName, detail)
}
func flagName(parameter interface{}, fieldErr validator.FieldError) string {
fields, err := clitag.Parse(parameter)
if err != nil {
panic(err) // 基本的にコード生成時にclitag.Parseを呼び出し済みなため発生し得ない
}
namespaces := strings.Split(fieldErr.StructNamespace(), ".")
errFieldName := strings.Join(namespaces[1:], ".") // .で区切った先頭を除いたもの
for _, f := range fields {
if f.FieldName == errFieldName {
return naming.ToCLIFlag(f.FlagName)
}
}
return naming.ToCLIFlag(fieldErr.StructField())
}