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Original file line number | Diff line number | Diff line change |
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package hw09structvalidator | ||
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import ( | ||
"fmt" | ||
"reflect" | ||
"strings" | ||
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"github.com/DimVlas/otus_hw/hw09_struct_validator/rules" | ||
) | ||
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func validate(v reflect.Value, vTag string) error { | ||
switch v.Kind() { | ||
case reflect.Struct: | ||
return validateStruct(v, vTag) | ||
case reflect.String: | ||
return validateString(v, vTag) | ||
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default: | ||
return fmt.Errorf("'%s' unknown data type for validation", v.Type()) | ||
} | ||
} | ||
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// Валидирует структутру. | ||
// Принимает | ||
// v типа reflect.Value струтуры, если v.Kind() != reflect.Struct - panic; | ||
// vTag - тэг с правилами проверки | ||
// Возвращает error, если произошла программная ошибка | ||
// или ValidationErrors, если были ошибки валидации. | ||
// Валидация проходит в 2 этапа | ||
// сначала валидируется целиком структура, согласно правилам описанным в vTag, | ||
// далее запускается валидация каждого публичного поля структуры | ||
func validateStruct(v reflect.Value, vTag string) error { | ||
var errStruct rules.ValidationErrors | ||
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err := validStructR(v, vTag) | ||
if err != nil { | ||
var ok bool | ||
if errStruct, ok = err.(rules.ValidationErrors); !ok { | ||
return err | ||
} | ||
} | ||
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err = validStructF(v) | ||
if err != nil { | ||
errVaild, ok := err.(rules.ValidationErrors) | ||
if !ok { | ||
return err | ||
} | ||
if errStruct == nil { | ||
return errVaild | ||
} | ||
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errStruct = append(errStruct, errVaild...) | ||
return errStruct | ||
} | ||
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return err | ||
} | ||
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// валидирует структуру "целиком" соглано правилам валидации структуры | ||
// Validation Structure Rules | ||
func validStructR(v reflect.Value, vTag string) error { | ||
if len(vTag) == 0 { | ||
return nil | ||
} | ||
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return nil | ||
} | ||
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// валидирует поля структуры | ||
// Validation Structure Fields | ||
func validStructF(v reflect.Value) error { | ||
cnt := v.NumField() | ||
if cnt < 1 { | ||
return nil | ||
} | ||
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var errStruct = rules.ValidationErrors{} | ||
for i := 0; i < cnt; i++ { | ||
f := v.Type().Field(i) | ||
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if f.PkgPath != "" { // приватное поле | ||
continue | ||
} | ||
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tag := f.Tag.Get("validate") | ||
if len(tag) == 0 { | ||
continue | ||
} | ||
// рекурсивно выполняем валидацию значения поля | ||
errField := validate(v.Field(i), tag) | ||
if errField != nil { | ||
errValid, ok := errField.(rules.ValidationErrors) | ||
if !ok { | ||
return errField | ||
} | ||
for i := range errValid { | ||
errValid[i].Field = f.Name | ||
} | ||
errStruct = append(errStruct, errValid...) | ||
} | ||
} | ||
if len(errStruct) > 0 { | ||
return errStruct | ||
} | ||
return nil | ||
} | ||
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func validateString(v reflect.Value, vTag string) error { | ||
if len(vTag) == 0 { | ||
return rules.ErrEmptyRule | ||
} | ||
rule := strings.Split(vTag, ":") | ||
if len(rule) != 2 { | ||
return rules.ErrUnknowRule | ||
} | ||
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f, ok := rules.Rules[v.Kind()][rule[0]] | ||
if !ok { | ||
return rules.ErrUnknowRule | ||
} | ||
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return f(v, rule[1]) | ||
} | ||
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// func checkStruct(v interface{}) error { | ||
// tp := reflect.TypeOf(v) | ||
// vl := reflect.ValueOf(v) | ||
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// if tp.Kind() != reflect.Struct { | ||
// return rules.ErrRequireStruct | ||
// } | ||
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// cnt := tp.NumField() | ||
// if cnt < 1 { | ||
// return nil | ||
// } | ||
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// for i := 0; i < cnt; i++ { | ||
// field := tp.Field(i) | ||
// if field.PkgPath != "" { // приватное поле | ||
// continue | ||
// } | ||
// tag := field.Tag | ||
// tagValidate := tag.Get("validate") | ||
// if tagValidate == "" { | ||
// continue | ||
// } | ||
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// fv := vl.FieldByName(field.Name) | ||
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// fmt.Println(fv) | ||
// fmt.Printf("field: %s\n", field.Name) | ||
// fmt.Print("rules:\n") | ||
// rs := strings.Split(tagValidate, "|") | ||
// for _, r := range rs { | ||
// fmt.Printf(" %s\n", r) | ||
// } | ||
// fmt.Println() | ||
// } | ||
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// return nil | ||
// } |
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