Rene Nochebuena
328b80c060
Struct validation backed by go-playground/validator/v10 with xerrors integration and pluggable i18n message providers. What's included: - Validator interface with Struct(v any) error method - New(...Option) constructor with WithMessageProvider functional option - MessageProvider interface for i18n; DefaultMessages (EN) and SpanishMessages (ES) built in - ValidationErrors mapped to xerrors.ErrInvalidInput with field and tag context keys - InvalidValidationError (non-struct input) mapped to xerrors.ErrInternal - Full playground.ValidationErrors attached via WithError for callers needing all failures Tested-via: todo-api POC integration Reviewed-against: docs/adr/
62 lines
2.1 KiB
Go
62 lines
2.1 KiB
Go
package valid
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import "fmt"
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// MessageProvider maps a validation failure to a human-readable message.
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//
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// - field: the struct field name (e.g. "Email")
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// - tag: the failing validation rule (e.g. "required", "email", "min")
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// - param: the rule parameter if any (e.g. "18" for min=18), or "" if none
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type MessageProvider interface {
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Message(field, tag, param string) string
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}
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// DefaultMessages is the built-in English message provider.
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// Used automatically when no WithMessageProvider option is given.
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var DefaultMessages MessageProvider = defaultMessages{}
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// SpanishMessages is an opt-in Spanish message provider.
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var SpanishMessages MessageProvider = spanishMessages{}
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// ---------------------------------------------------------------
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// English (default)
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// ---------------------------------------------------------------
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type defaultMessages struct{}
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func (defaultMessages) Message(field, tag, param string) string {
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switch tag {
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case "required":
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return fmt.Sprintf("field '%s' is required", field)
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case "email":
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return fmt.Sprintf("field '%s' must be a valid email address", field)
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case "min":
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return fmt.Sprintf("field '%s' is too short (minimum %s)", field, param)
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case "max":
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return fmt.Sprintf("field '%s' is too long (maximum %s)", field, param)
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default:
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return fmt.Sprintf("field '%s' failed validation rule '%s'", field, tag)
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}
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}
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// ---------------------------------------------------------------
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// Spanish (opt-in)
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// ---------------------------------------------------------------
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type spanishMessages struct{}
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func (spanishMessages) Message(field, tag, param string) string {
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switch tag {
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case "required":
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return fmt.Sprintf("El campo '%s' es obligatorio", field)
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case "email":
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return fmt.Sprintf("El campo '%s' debe ser un correo electrónico válido", field)
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case "min":
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return fmt.Sprintf("El campo '%s' es demasiado corto (mínimo %s)", field, param)
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case "max":
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return fmt.Sprintf("El campo '%s' es demasiado largo (máximo %s)", field, param)
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default:
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return fmt.Sprintf("Error en el campo '%s': regla '%s' no cumplida", field, tag)
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}
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}
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