126 lines
3.0 KiB
Go
126 lines
3.0 KiB
Go
// Copyright (c) 2025-2026 Probo Inc <hello@getprobo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package validator
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import (
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"reflect"
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)
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type Validator struct {
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errors ValidationErrors
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}
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func New() *Validator {
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return &Validator{
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errors: ValidationErrors{},
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}
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}
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func (v *Validator) Check(value any, field string, validators ...ValidatorFunc) {
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if len(validators) == 0 {
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return
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}
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// Dereference pointer values to get the actual value for validation
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actualValue := value
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if value != nil {
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val := reflect.ValueOf(value)
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// Dereference all pointer levels
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for val.Kind() == reflect.Pointer && !val.IsNil() {
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val = val.Elem()
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actualValue = val.Interface()
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}
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// If we ended up with a nil pointer at any level, set actualValue to nil
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if val.Kind() == reflect.Pointer && val.IsNil() {
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actualValue = nil
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}
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}
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for _, validator := range validators {
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if err := validator(actualValue); err != nil {
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v.errors = append(v.errors, &ValidationError{
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Field: field,
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Code: err.Code,
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Message: err.Message,
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Value: value,
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})
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}
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}
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}
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func (v *Validator) CheckEach(items any, field string, fn func(index int, item any)) {
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if items == nil {
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return
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}
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if slice, ok := items.([]any); ok {
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for i, item := range slice {
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fn(i, item)
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}
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return
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}
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val := reflect.ValueOf(items)
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// Dereference pointer levels to get to the actual slice
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for val.Kind() == reflect.Pointer {
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if val.IsNil() {
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return
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}
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val = val.Elem()
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}
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if val.Kind() != reflect.Slice {
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v.errors = append(v.errors, &ValidationError{
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Field: field,
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Code: ErrorCodeInvalidFormat,
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Message: "expected a slice",
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Value: items,
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})
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return
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}
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for i := 0; i < val.Len(); i++ {
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fn(i, val.Index(i).Interface())
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}
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}
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func (v *Validator) Error() error {
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if len(v.errors) == 0 {
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return nil
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}
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return v.errors
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}
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type ValidatorFunc func(value any) *ValidationError
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// dereferenceValue recursively dereferences all pointer levels.
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// Returns the final dereferenced value and a boolean indicating if any pointer in the chain was nil.
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func dereferenceValue(value any) (any, bool) {
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if value == nil {
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return nil, true
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}
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val := reflect.ValueOf(value)
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// Dereference all pointer levels
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for val.Kind() == reflect.Pointer {
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if val.IsNil() {
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return nil, true
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}
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val = val.Elem()
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}
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return val.Interface(), false
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}
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