531 lines
13 KiB
JavaScript
531 lines
13 KiB
JavaScript
exports.Validatable = Validatable;
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/**
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* Validation encapsulated in this abstract class.
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*
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* Basically validation configurators is just class methods, which adds validations
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* configs to AbstractClass._validations. Each of this validations run when
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* `obj.isValid()` method called.
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*
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* Each configurator can accept n params (n-1 field names and one config). Config
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* is {Object} depends on specific validation, but all of them has one common part:
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* `message` member. It can be just string, when only one situation possible,
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* e.g. `Post.validatesPresenceOf('title', { message: 'can not be blank' });`
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*
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* In more complicated cases it can be {Hash} of messages (for each case):
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* `User.validatesLengthOf('password', { min: 6, max: 20, message: {min: 'too short', max: 'too long'}});`
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*/
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function Validatable() {
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// validatable class
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};
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/**
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* Validate presence. This validation fails when validated field is blank.
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*
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* Default error message "can't be blank"
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*
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* @example presence of title
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* ```
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* Post.validatesPresenceOf('title');
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* ```
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* @example with custom message
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* ```
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* Post.validatesPresenceOf('title', {message: 'Can not be blank'});
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* ```
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*
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* @sync
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*
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* @nocode
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* @see helper/validatePresence
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*/
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Validatable.validatesPresenceOf = getConfigurator('presence');
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/**
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* Validate length. Three kinds of validations: min, max, is.
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*
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* Default error messages:
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*
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* - min: too short
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* - max: too long
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* - is: length is wrong
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*
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* @example length validations
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* ```
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* User.validatesLengthOf('password', {min: 7});
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* User.validatesLengthOf('email', {max: 100});
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* User.validatesLengthOf('state', {is: 2});
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* User.validatesLengthOf('nick', {min: 3, max: 15});
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* ```
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* @example length validations with custom error messages
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* ```
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* User.validatesLengthOf('password', {min: 7, message: {min: 'too weak'}});
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* User.validatesLengthOf('state', {is: 2, message: {is: 'is not valid state name'}});
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* ```
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*
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* @sync
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* @nocode
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* @see helper/validateLength
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*/
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Validatable.validatesLengthOf = getConfigurator('length');
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/**
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* Validate numericality.
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*
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* @example
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* ```
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* User.validatesNumericalityOf('age', { message: { number: '...' }});
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* User.validatesNumericalityOf('age', {int: true, message: { int: '...' }});
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* ```
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*
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* Default error messages:
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*
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* - number: is not a number
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* - int: is not an integer
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*
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* @sync
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* @nocode
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* @see helper/validateNumericality
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*/
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Validatable.validatesNumericalityOf = getConfigurator('numericality');
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/**
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* Validate inclusion in set
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*
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* @example
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* ```
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* User.validatesInclusionOf('gender', {in: ['male', 'female']});
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* User.validatesInclusionOf('role', {
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* in: ['admin', 'moderator', 'user'], message: 'is not allowed'
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* });
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* ```
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*
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* Default error message: is not included in the list
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*
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* @sync
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* @nocode
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* @see helper/validateInclusion
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*/
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Validatable.validatesInclusionOf = getConfigurator('inclusion');
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/**
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* Validate exclusion
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*
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* @example `Company.validatesExclusionOf('domain', {in: ['www', 'admin']});`
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*
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* Default error message: is reserved
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*
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* @nocode
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* @see helper/validateExclusion
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*/
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Validatable.validatesExclusionOf = getConfigurator('exclusion');
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/**
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* Validate format
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*
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* Default error message: is invalid
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*
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* @nocode
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* @see helper/validateFormat
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*/
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Validatable.validatesFormatOf = getConfigurator('format');
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/**
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* Validate using custom validator
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*
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* Default error message: is invalid
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*
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* @nocode
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* @see helper/validateCustom
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*/
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Validatable.validate = getConfigurator('custom');
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/**
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* Validate using custom async validator
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*
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* Default error message: is invalid
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*
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* @async
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* @nocode
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* @see helper/validateCustom
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*/
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Validatable.validateAsync = getConfigurator('custom', {async: true});
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/**
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* Validate uniqueness
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*
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* Default error message: is not unique
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*
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* @async
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* @nocode
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* @see helper/validateUniqueness
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*/
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Validatable.validatesUniquenessOf = getConfigurator('uniqueness', {async: true});
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// implementation of validators
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/**
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* Presence validator
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*/
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function validatePresence(attr, conf, err) {
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if (blank(this[attr])) {
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err();
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}
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}
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/**
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* Length validator
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*/
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function validateLength(attr, conf, err) {
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if (nullCheck.call(this, attr, conf, err)) return;
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var len = this[attr].length;
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if (conf.min && len < conf.min) {
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err('min');
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}
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if (conf.max && len > conf.max) {
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err('max');
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}
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if (conf.is && len !== conf.is) {
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err('is');
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}
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}
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/**
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* Numericality validator
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*/
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function validateNumericality(attr, conf, err) {
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if (nullCheck.call(this, attr, conf, err)) return;
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if (typeof this[attr] !== 'number') {
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return err('number');
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}
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if (conf.int && this[attr] !== Math.round(this[attr])) {
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return err('int');
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}
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}
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/**
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* Inclusion validator
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*/
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function validateInclusion(attr, conf, err) {
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if (nullCheck.call(this, attr, conf, err)) return;
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if (!~conf.in.indexOf(this[attr])) {
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err()
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}
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}
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/**
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* Exclusion validator
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*/
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function validateExclusion(attr, conf, err) {
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if (nullCheck.call(this, attr, conf, err)) return;
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if (~conf.in.indexOf(this[attr])) {
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err()
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}
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}
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/**
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* Format validator
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*/
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function validateFormat(attr, conf, err) {
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if (nullCheck.call(this, attr, conf, err)) return;
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if (typeof this[attr] === 'string') {
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if (!this[attr].match(conf['with'])) {
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err();
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}
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} else {
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err();
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}
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}
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/**
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* Custom validator
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*/
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function validateCustom(attr, conf, err, done) {
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conf.customValidator.call(this, err, done);
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}
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/**
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* Uniqueness validator
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*/
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function validateUniqueness(attr, conf, err, done) {
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var cond = {where: {}};
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cond.where[attr] = this[attr];
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this.constructor.all(cond, function (error, found) {
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if (found.length > 1) {
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err();
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} else if (found.length === 1 && found[0].id != this.id) {
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err();
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}
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done();
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}.bind(this));
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}
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var validators = {
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presence: validatePresence,
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length: validateLength,
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numericality: validateNumericality,
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inclusion: validateInclusion,
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exclusion: validateExclusion,
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format: validateFormat,
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custom: validateCustom,
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uniqueness: validateUniqueness
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};
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function getConfigurator(name, opts) {
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return function () {
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configure(this, name, arguments, opts);
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};
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}
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/**
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* This method performs validation, triggers validation hooks.
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* Before validation `obj.errors` collection cleaned.
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* Each validation can add errors to `obj.errors` collection.
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* If collection is not blank, validation failed.
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*
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* @warning This method can be called as sync only when no async validation
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* configured. It's strongly recommended to run all validations as asyncronous.
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*
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* @param {Function} callback called with (valid)
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* @return {Boolean} true if no async validation configured and all passed
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*
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* @example ExpressJS controller: render user if valid, show flash otherwise
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* ```
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* user.isValid(function (valid) {
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* if (valid) res.render({user: user});
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* else res.flash('error', 'User is not valid'), console.log(user.errors), res.redirect('/users');
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* });
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* ```
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*/
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Validatable.prototype.isValid = function (callback) {
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var valid = true, inst = this, wait = 0, async = false;
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// exit with success when no errors
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if (!this.constructor._validations) {
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cleanErrors(this);
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if (callback) {
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callback(valid);
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}
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return valid;
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}
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Object.defineProperty(this, 'errors', {
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enumerable: false,
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configurable: true,
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value: new Errors
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});
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this.trigger('validation', function (validationsDone) {
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var inst = this;
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this.constructor._validations.forEach(function (v) {
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if (v[2] && v[2].async) {
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async = true;
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wait += 1;
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validationFailed(inst, v, done);
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} else {
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if (validationFailed(inst, v)) {
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valid = false;
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}
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}
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});
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if (!async) {
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validationsDone();
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}
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var asyncFail = false;
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function done(fail) {
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asyncFail = asyncFail || fail;
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if (--wait === 0 && callback) {
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validationsDone.call(inst, function () {
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if( valid && !asyncFail ) cleanErrors(inst);
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callback(valid && !asyncFail);
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});
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}
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}
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});
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if (!async) {
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if (valid) cleanErrors(this);
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if (callback) callback(valid);
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return valid;
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} else {
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// in case of async validation we should return undefined here,
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// because not all validations are finished yet
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return;
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}
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};
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function cleanErrors(inst) {
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Object.defineProperty(inst, 'errors', {
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enumerable: false,
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configurable: true,
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value: false
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});
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}
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function validationFailed(inst, v, cb) {
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var attr = v[0];
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var conf = v[1];
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var opts = v[2] || {};
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if (typeof attr !== 'string') return false;
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// here we should check skip validation conditions (if, unless)
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// that can be specified in conf
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if (skipValidation(inst, conf, 'if')) return false;
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if (skipValidation(inst, conf, 'unless')) return false;
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var fail = false;
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var validator = validators[conf.validation];
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var validatorArguments = [];
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validatorArguments.push(attr);
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validatorArguments.push(conf);
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validatorArguments.push(function onerror(kind) {
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var message;
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if (conf.message) {
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message = conf.message;
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}
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if (!message && defaultMessages[conf.validation]) {
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message = defaultMessages[conf.validation];
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}
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if (!message) {
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message = 'is invalid';
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}
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if (kind) {
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if (message[kind]) {
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// get deeper
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message = message[kind];
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} else if (defaultMessages.common[kind]) {
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message = defaultMessages.common[kind];
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}
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}
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inst.errors.add(attr, message);
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fail = true;
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});
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if (cb) {
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validatorArguments.push(function () {
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cb(fail);
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});
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}
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validator.apply(inst, validatorArguments);
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return fail;
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}
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function skipValidation(inst, conf, kind) {
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console.log(conf, kind, inst.hasOwnProperty(conf[kind]), inst[conf[kind]]);
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var doValidate = true;
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if (typeof conf[kind] === 'function') {
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doValidate = conf[kind].call(inst);
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if (kind === 'unless') doValidate = !doValidate;
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} else if (typeof conf[kind] === 'string') {
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if (typeof inst[conf[kind]] === 'function') {
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doValidate = inst[conf[kind]].call(inst);
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if (kind === 'unless') doValidate = !doValidate;
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} else if (inst.hasOwnProperty(conf[kind])) {
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doValidate = inst[conf[kind]];
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if (kind === 'unless') doValidate = !doValidate;
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} else {
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doValidate = kind === 'if';
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}
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}
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return !doValidate;
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}
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var defaultMessages = {
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presence: 'can\'t be blank',
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length: {
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min: 'too short',
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max: 'too long',
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is: 'length is wrong'
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},
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common: {
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blank: 'is blank',
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'null': 'is null'
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},
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numericality: {
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'int': 'is not an integer',
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'number': 'is not a number'
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},
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inclusion: 'is not included in the list',
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exclusion: 'is reserved',
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uniqueness: 'is not unique'
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};
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function nullCheck(attr, conf, err) {
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var isNull = this[attr] === null || !(attr in this);
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if (isNull) {
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if (!conf.allowNull) {
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err('null');
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}
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return true;
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} else {
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if (blank(this[attr])) {
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if (!conf.allowBlank) {
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err('blank');
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}
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return true;
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}
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}
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return false;
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}
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/**
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* Return true when v is undefined, blank array, null or empty string
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* otherwise returns false
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*
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* @param {Mix} v
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* @returns {Boolean} whether `v` blank or not
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*/
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function blank(v) {
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if (typeof v === 'undefined') return true;
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if (v instanceof Array && v.length === 0) return true;
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if (v === null) return true;
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if (typeof v == 'string' && v === '') return true;
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return false;
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}
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function configure(cls, validation, args, opts) {
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if (!cls._validations) {
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Object.defineProperty(cls, '_validations', {
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writable: true,
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configurable: true,
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enumerable: false,
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value: []
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});
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}
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args = [].slice.call(args);
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var conf;
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if (typeof args[args.length - 1] === 'object') {
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conf = args.pop();
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} else {
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conf = {};
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}
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if (validation === 'custom' && typeof args[args.length - 1] === 'function') {
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conf.customValidator = args.pop();
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}
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conf.validation = validation;
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args.forEach(function (attr) {
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cls._validations.push([attr, conf, opts]);
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});
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}
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function Errors() {
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}
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Errors.prototype.add = function (field, message) {
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if (!this[field]) {
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this[field] = [message];
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} else {
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this[field].push(message);
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}
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};
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