86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
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package valid
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import (
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"errors"
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"reflect"
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"strings"
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"code.nochebuena.dev/einherjar/core/xerrors"
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playground "github.com/go-playground/validator/v10"
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)
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// Validator validates structs using struct tags.
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type Validator interface {
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// Struct validates v and returns a *xerrors.Err if validation fails.
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// Returns nil if v is valid.
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// Returns ErrInvalidInput for field constraint failures (first error only).
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// Returns ErrInternal if v is not a struct.
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Struct(v any) error
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}
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var _ Validator = (*validator)(nil)
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// New returns a Validator. Without options, DefaultMessages (English) is used.
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// Field names in error context use the json struct tag when available,
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// falling back to the Go field name.
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func New(opts ...Option) Validator {
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cfg := &config{mp: DefaultMessages}
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for _, o := range opts {
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o(cfg)
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}
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v := playground.New()
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v.RegisterTagNameFunc(func(fld reflect.StructField) string {
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name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0]
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if name == "" || name == "-" {
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return fld.Name
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}
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return name
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})
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for _, cv := range cfg.customValidators {
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if err := v.RegisterValidation(cv.tag, func(fl playground.FieldLevel) bool {
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return cv.fn(fieldLevelAdapter{fl})
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}); err != nil {
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panic("valid: WithCustomValidator tag " + cv.tag + ": " + err.Error())
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}
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}
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return &validator{v: v, mp: cfg.mp}
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}
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type fieldLevelAdapter struct{ fl playground.FieldLevel }
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func (a fieldLevelAdapter) Field() reflect.Value { return a.fl.Field() }
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func (a fieldLevelAdapter) Param() string { return a.fl.Param() }
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func (a fieldLevelAdapter) FieldName() string { return a.fl.FieldName() }
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type validator struct {
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v *playground.Validate
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mp MessageProvider
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}
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// Struct implements Validator.
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// Only the first validation error is surfaced. Apps needing all failures can
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// cast errors.Unwrap(err) to playground.ValidationErrors themselves.
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func (val *validator) Struct(v any) error {
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err := val.v.Struct(v)
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if err == nil {
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return nil
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}
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var invalidErr *playground.InvalidValidationError
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if errors.As(err, &invalidErr) {
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return xerrors.Wrap(xerrors.ErrInternal, "internal validation error", err)
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}
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var validationErrs playground.ValidationErrors
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if errors.As(err, &validationErrs) {
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first := validationErrs[0]
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msg := val.mp.Message(first.Field(), first.Tag(), first.Param())
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return xerrors.New(xerrors.ErrInvalidInput, msg).
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WithContext("field", first.Field()).
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WithContext("tag", first.Tag()).
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WithError(err)
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}
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return xerrors.Wrap(xerrors.ErrInternal, "internal validation error", err)
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}
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