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package validation |
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import ( |
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"context" |
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"time" |
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"golang.org/x/text/language" |
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"golang.org/x/text/message/catalog" |
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) |
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// Validator is the main validation service. It can be created by NewValidator constructor. |
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// Also, you can use singleton version from the package "github.com/muonsoft/validation/validator". |
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type Validator struct { |
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scope Scope |
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} |
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// ValidatorOption is a base type for configuration options used to create a new instance of Validator. |
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type ValidatorOption func(validator *Validator) error |
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// NewValidator is a constructor for creating an instance of Validator. |
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// You can configure it by using validator options. |
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// |
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// Example |
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// validator, err := validation.NewValidator( |
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// validation.DefaultLanguage(language.Russian), // passing default language of translations |
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// validation.Translations(russian.Messages), // setting up custom or built-in translations |
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// validation.SetViolationFactory(userViolationFactory), // if you want to override creation of violations |
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// ) |
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// |
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// // don't forget to check for errors |
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// if err != nil { |
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// fmt.Println(err) |
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// } |
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func NewValidator(options ...ValidatorOption) (*Validator, error) { |
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validator := &Validator{scope: newScope()} |
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for _, setOption := range options { |
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err := setOption(validator) |
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if err != nil { |
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return nil, err |
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} |
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} |
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err := validator.scope.translator.init() |
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if err != nil { |
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return nil, err |
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} |
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return validator, nil |
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} |
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func newScopedValidator(scope Scope) *Validator { |
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return &Validator{scope: scope} |
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} |
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// DefaultLanguage is used to set up the default language for translation of violation messages. |
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func DefaultLanguage(tag language.Tag) ValidatorOption { |
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return func(validator *Validator) error { |
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validator.scope.translator.defaultLanguage = tag |
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return nil |
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} |
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} |
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// Translations is used to load translation messages into the validator. |
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// |
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// By default, all violation messages are generated in the English language with pluralization capabilities. |
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// To use a custom language you have to load translations on validator initialization. |
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// Built-in translations are available in the sub-packages of the package "github.com/muonsoft/message/translations". |
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// The translation mechanism is provided by the "golang.org/x/text" package (be aware, it has no stable version yet). |
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// |
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// Example |
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// // import "github.com/muonsoft/validation/message/translations/russian" |
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// |
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// validator, err := validation.NewValidator( |
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// validation.Translations(russian.Messages), |
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// ) |
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func Translations(messages map[language.Tag]map[string]catalog.Message) ValidatorOption { |
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return func(validator *Validator) error { |
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return validator.scope.translator.loadMessages(messages) |
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} |
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} |
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// SetViolationFactory can be used to override the mechanism of violation creation. |
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func SetViolationFactory(factory ViolationFactory) ValidatorOption { |
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return func(validator *Validator) error { |
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validator.scope.violationFactory = factory |
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return nil |
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} |
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} |
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// StoredConstraint option can be used to store a constraint in an internal validator store. |
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// It can later be used by the validator.ValidateBy method. This can be useful for passing |
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// custom or prepared constraints to Validatable. |
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// |
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// If the constraint already exists, a ConstraintAlreadyStoredError will be returned. |
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// |
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// Example |
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// validator, err := validation.NewValidator( |
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// validation.StoredConstraint("isTagExists", isTagExistsConstraint) |
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// ) |
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// if err != nil { |
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// log.Fatal(err) |
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// } |
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// |
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// err = validator.ValidateString("", validator.ValidateBy("isTagExists")) |
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func StoredConstraint(key string, constraint Constraint) ValidatorOption { |
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return func(validator *Validator) error { |
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if _, exists := validator.scope.constraints[key]; exists { |
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return ConstraintAlreadyStoredError{Key: key} |
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} |
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validator.scope.constraints[key] = constraint |
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return nil |
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} |
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} |
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// Validate is the main validation method. It accepts validation arguments. Arguments can be |
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// used to tune up the validation process or to pass values of a specific type. |
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func (validator *Validator) Validate(ctx context.Context, arguments ...Argument) error { |
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args := &Arguments{scope: validator.scope.withContext(ctx)} |
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for _, argument := range arguments { |
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err := argument.set(args) |
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if err != nil { |
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return err |
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} |
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} |
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violations := &ViolationList{} |
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for _, validate := range args.validators { |
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vs, err := validate(args.scope) |
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if err != nil { |
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return err |
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} |
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violations.Join(vs) |
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} |
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return violations.AsError() |
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} |
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// ValidateValue is an alias for validating a single value of any supported type. |
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func (validator *Validator) ValidateValue(ctx context.Context, value interface{}, options ...Option) error { |
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return validator.Validate(ctx, Value(value, options...)) |
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} |
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// ValidateBool is an alias for validating a single boolean value. |
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func (validator *Validator) ValidateBool(ctx context.Context, value bool, options ...Option) error { |
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return validator.Validate(ctx, Bool(value, options...)) |
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} |
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// ValidateNumber is an alias for validating a single numeric value (integer or float). |
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func (validator *Validator) ValidateNumber(ctx context.Context, value interface{}, options ...Option) error { |
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return validator.Validate(ctx, Number(value, options...)) |
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} |
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// ValidateString is an alias for validating a single string value. |
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func (validator *Validator) ValidateString(ctx context.Context, value string, options ...Option) error { |
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return validator.Validate(ctx, String(value, options...)) |
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} |
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// ValidateStrings is an alias for validating slice of strings. |
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func (validator *Validator) ValidateStrings(ctx context.Context, values []string, options ...Option) error { |
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return validator.Validate(ctx, Strings(values, options...)) |
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} |
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// ValidateIterable is an alias for validating a single iterable value (an array, slice, or map). |
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func (validator *Validator) ValidateIterable(ctx context.Context, value interface{}, options ...Option) error { |
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return validator.Validate(ctx, Iterable(value, options...)) |
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} |
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// ValidateCountable is an alias for validating a single countable value (an array, slice, or map). |
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func (validator *Validator) ValidateCountable(ctx context.Context, count int, options ...Option) error { |
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return validator.Validate(ctx, Countable(count, options...)) |
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} |
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// ValidateTime is an alias for validating a single time value. |
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func (validator *Validator) ValidateTime(ctx context.Context, value time.Time, options ...Option) error { |
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return validator.Validate(ctx, Time(value, options...)) |
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} |
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// ValidateEach is an alias for validating each value of an iterable (an array, slice, or map). |
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func (validator *Validator) ValidateEach(ctx context.Context, value interface{}, options ...Option) error { |
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return validator.Validate(ctx, Each(value, options...)) |
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} |
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// ValidateEachString is an alias for validating each value of a strings slice. |
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func (validator *Validator) ValidateEachString(ctx context.Context, values []string, options ...Option) error { |
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return validator.Validate(ctx, EachString(values, options...)) |
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} |
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// ValidateValidatable is an alias for validating value that implements the Validatable interface. |
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func (validator *Validator) ValidateValidatable(ctx context.Context, validatable Validatable, options ...Option) error { |
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return validator.Validate(ctx, Valid(validatable, options...)) |
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} |
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// ValidateBy is used to get the constraint from the internal validator store. |
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// If the constraint does not exist, then the validator will |
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// return a ConstraintNotFoundError during the validation process. |
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// For storing a constraint you should use the StoredConstraint option. |
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func (validator *Validator) ValidateBy(constraintKey string) Constraint { |
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if constraint, exists := validator.scope.constraints[constraintKey]; exists { |
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return constraint |
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} |
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return notFoundConstraint{key: constraintKey} |
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} |
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// WithLanguage method creates a new scoped validator with a given language tag. All created violations |
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// will be translated into this language. |
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// |
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// Example |
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// err := validator.WithLanguage(language.Russian).Validate( |
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// validation.ValidateString(&s, it.IsNotBlank()), // violation from this constraint will be translated |
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// ) |
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func (validator *Validator) WithLanguage(tag language.Tag) *Validator { |
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return newScopedValidator(validator.scope.withLanguage(tag)) |
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} |
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// AtProperty method creates a new scoped validator with injected property name element to scope property path. |
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func (validator *Validator) AtProperty(name string) *Validator { |
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return newScopedValidator(validator.scope.AtProperty(name)) |
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} |
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// AtIndex method creates a new scoped validator with injected array index element to scope property path. |
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func (validator *Validator) AtIndex(index int) *Validator { |
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return newScopedValidator(validator.scope.AtIndex(index)) |
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} |
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// BuildViolation can be used to build a custom violation on the client-side. |
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func (validator *Validator) BuildViolation(ctx context.Context, code, message string) *ViolationBuilder { |
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return validator.scope.withContext(ctx).BuildViolation(code, message) |
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} |
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muonsoft /
validation
