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is_array_validator.go
120 lines (105 loc) · 2.29 KB
/
is_array_validator.go
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package validators
import (
"encoding/json"
"errors"
"fmt"
"reflect"
)
// Checks if the value is a valid array.
//
// Configuration parameters:
// - validators ([]Validator): validators that will be applied to each value in the array.
// - errorMessage (string): custom error message (optional).
//
// Input value (slice | array): value to be validated.
//
// Usage examples:
//
// value1 := []string{""}
// IsArray(
// []Validator{
// IsString(),
// },
// )(value1) // Output: nil, false
//
// value2 := [1]string{""}
// IsArray(
// []Validator{
// IsString(),
// },
// )(value2) // Output: nil, false
//
// value3 := ""
// IsArray(
// []Validator{
// IsString(),
// },
// )(value3) // Output: [error message], true
//
// value4 := nil
// IsNullArray(
// []Validator{
// IsString(),
// },
// )(value4) // Output: [error message], true
func IsArray(
validators []Validator,
errorMessage ...string,
) Validator {
message := ""
hasErrorMessage := len(errorMessage) != 0
if hasErrorMessage {
message = errorMessage[0]
}
return func(value any) (error, bool) {
if value == nil {
if !hasErrorMessage {
message = getDefaultErrorMessage(
"null",
)
}
return errors.New(message), true
}
valueType := reflect.ValueOf(value)
switch valueType.Kind() {
case reflect.Slice, reflect.Array:
fieldErrMessages := make(map[int][]string)
for i := 0; i < valueType.Len(); i++ {
var fieldErrors []string
fieldValue := valueType.Index(i).Interface()
for _, validator := range validators {
err, abortValidation := validator(fieldValue)
if err != nil {
fieldErrors = append(fieldErrors, err.Error())
}
if abortValidation {
break
}
}
if len(fieldErrors) != 0 {
fieldErrMessages[i] = fieldErrors
}
}
if len(fieldErrMessages) != 0 {
errMessages, _ := json.Marshal(fieldErrMessages)
return errors.New(string(errMessages)), true
}
default:
if !hasErrorMessage {
message = getDefaultErrorMessage(
valueType.Kind().String(),
)
}
return errors.New(message), true
}
return nil, false
}
}
func getDefaultErrorMessage(
valueType string,
) string {
return fmt.Sprintf(
"The value is not an array: value is %s",
valueType,
)
}