factory.js

import Mixin from '@ember/object/mixin';
import { Promise } from 'rsvp';
import EmberObject, { getWithDefault, computed, set, get } from '@ember/object';
import { A as emberArray, makeArray, isArray } from '@ember/array';
import { readOnly } from '@ember/object/computed';
import { assign } from '@ember/polyfills';
import { run } from '@ember/runloop';
import { guidFor } from '@ember/object/internals';
import { isEmpty, isNone } from '@ember/utils';
import { getOwner } from '@ember/application';
import deepSet from '../utils/deep-set';
import ValidationResult from '../-private/result';
import ResultCollection from './result-collection';
import BaseValidator from '../validators/base';
import cycleBreaker from '../utils/cycle-breaker';
import shouldCallSuper from '../utils/should-call-super';
import lookupValidator from '../utils/lookup-validator';
import { flatten } from '../utils/array';
import {
  getDependentKeys,
  isDescriptor,
  isDsModel,
  isValidatable,
  isPromise,
  mergeOptions
} from '../utils/utils';
import {
  VALIDATIONS_CLASS,
  IS_VALIDATIONS_CLASS,
  ATTRS_MODEL,
  ATTRS_PATH,
  ATTRS_RESULT_COLLECTION
} from '../-private/symbols';

const VALIDATION_COUNT_MAP = new WeakMap();

/**
 * ## Running Manual Validations
 *
 * Although validations are lazily computed, there are times where we might want to force all or
 * specific validations to happen. For this reason we have exposed three methods:
 *
 * - {{#crossLink "Factory/validate:method"}}{{/crossLink}}: Will always return a promise and should be used if asynchronous validations are present
 * - {{#crossLink "Factory/validateSync:method"}}{{/crossLink}}: Should only be used if all validations are synchronous. It will throw an error if any of the validations are asynchronous
 * - {{#crossLink "Factory/validateAttribute:method"}}{{/crossLink}}: A functional approach to validating an attribute without changing its state
 *
 * @module Validations
 * @main Validations
 */

/**
 * All validations can be accessed via the `validations` object created on your model/object.
 * Each attribute also has its own validation which has the same properties.
 * An attribute validation can be accessed via `validations.attrs.<ATTRIBUTE>` which will return a {{#crossLink "ResultCollection"}}{{/crossLink}}.
 *
 * ### Global Validations
 *
 * Global validations exist on the `validations` object that resides on the object that is being validated.
 * To see all possible properties, please checkout the docs for {{#crossLink "ResultCollection"}}{{/crossLink}}.
 *
 * ```js
 * model.get('validations.isValid');
 * model.get('validations.errors');
 * model.get('validations.messages');
 * // etc...
 * ```
 *
 * ### Attribute Validations
 *
 * The `validations` object also contains an `attrs` object which holds a {{#crossLink "ResultCollection"}}{{/crossLink}}
 * for each attribute specified in your validation rules.
 *
 * ```js
 * model.get('validations.attrs.username.isValid');
 * model.get('validations.attrs.password.errors');
 * model.get('validations.attrs.email.messages');
 * // etc...
 * ```
 * @module Validations
 * @submodule Accessing Validations
 */

/**
 * @module Validations
 * @class Factory
 */

/**
 * Top level method that will ultimately return a mixin with all CP validations
 *
 * @method  buildValidations
 * @param  {Object} validations  Validation rules
 * @return {Ember.Mixin}
 */
export default function buildValidations(validations = {}, globalOptions = {}) {
  normalizeOptions(validations, globalOptions);

  let Validations, validationMixinCount;

  return Mixin.create({
    init() {
      this._super(...arguments);

      // Count number of mixins to bypass super check if there is more than 1
      validationMixinCount = (VALIDATION_COUNT_MAP.get(this) || 0) + 1;
      VALIDATION_COUNT_MAP.set(this, validationMixinCount);
    },
    [VALIDATIONS_CLASS]: computed(function() {
      if (!Validations) {
        let inheritedClass;

        if (
          shouldCallSuper(this, VALIDATIONS_CLASS) ||
          validationMixinCount > 1
        ) {
          inheritedClass = this._super();
        }

        Validations = createValidationsClass(inheritedClass, validations, this);
      }
      return Validations;
    }).readOnly(),

    validations: computed(function() {
      return this.get(VALIDATIONS_CLASS).create({ model: this });
    }).readOnly(),

    validate() {
      return get(this, 'validations').validate(...arguments);
    },

    validateSync() {
      return get(this, 'validations').validateSync(...arguments);
    },

    validateAttribute() {
      return get(this, 'validations').validateAttribute(...arguments);
    },

    destroy() {
      this._super(...arguments);
      get(this, 'validations').destroy();
    }
  });
}

/**
 * Validation rules can be created with default and global options
 * {
 *   description: 'Username',
 *   validators: [...]
 * }
 *
 * This method generate the default options pojo, applies it to each validation rule, and flattens the object
 *
 * @method normalizeOptions
 * @private
 * @param  {Object} validations
 * @return
 */
function normalizeOptions(validations = {}, globalOptions = {}) {
  let validatableAttrs = Object.keys(validations);

  validatableAttrs.forEach(attribute => {
    let rules = validations[attribute];

    if (rules && typeof rules === 'object' && isArray(rules.validators)) {
      let options = Object.keys(rules).reduce((o, k) => {
        if (k !== 'validators') {
          o[k] = rules[k];
        }
        return o;
      }, {});

      let { validators } = rules;
      validators.forEach(v => {
        v.defaultOptions = options;
      });
      validations[attribute] = validators;
    }
    validations[attribute] = makeArray(validations[attribute]);
    validations[attribute].forEach(v => {
      v.globalOptions = globalOptions;
    });
  });
}

/**
 * Creates the validations class that will become `model.validations`.
 *   - Setup parent validation inheritance
 *   - Normalize nested keys (i.e. 'details.dob') into objects (i.e { details: { dob: validator() }})
 *   - Merge normalized validations with parent
 *   - Create global CPs (i.e. 'isValid', 'messages', etc...)
 *
 * @method createValidationsClass
 * @private
 * @param  {Object} inheritedValidationsClass
 * @param  {Object} validations
 * @param  {Object} model
 * @return {Ember.Object}
 */
function createValidationsClass(inheritedValidationsClass, validations, model) {
  let validationRules = {};
  let validatableAttributes = Object.keys(validations);

  // Setup validation inheritance
  if (
    inheritedValidationsClass &&
    inheritedValidationsClass[IS_VALIDATIONS_CLASS]
  ) {
    let inheritedValidations = inheritedValidationsClass.create();

    validationRules = assign(
      validationRules,
      inheritedValidations.get('_validationRules')
    );
    validatableAttributes = emberArray(
      inheritedValidations
        .get('validatableAttributes')
        .concat(validatableAttributes)
    ).uniq();
  }

  // Normalize nested keys into actual objects and merge them with parent object
  Object.keys(validations).reduce((obj, key) => {
    deepSet(obj, key, validations[key]);
    return obj;
  }, validationRules);

  // Create the mixin that holds all the top level validation props (isValid, messages, etc)
  let TopLevelProps = createTopLevelPropsMixin(validatableAttributes);

  // Create the `attrs` class which will add the current model reference once instantiated
  let AttrsClass = createAttrsClass(
    validatableAttributes,
    validationRules,
    model
  );

  // Create `validations` class
  let ValidationsClass = EmberObject.extend(TopLevelProps, {
    model: null,
    attrs: null,
    isValidations: true,

    // Caches
    _validators: null,
    _debouncedValidations: null,

    // Private
    _validationRules: validationRules,

    validate,
    validateSync,
    validateAttribute,
    validatableAttributes,

    init() {
      this._super(...arguments);
      this.setProperties({
        attrs: AttrsClass.create({
          [ATTRS_MODEL]: this.get('model')
        }),
        _validators: {},
        _debouncedValidations: {}
      });
    },

    destroy() {
      this._super(...arguments);
      let validatableAttrs = get(this, 'validatableAttributes');
      let debouncedValidations = get(this, '_debouncedValidations');

      // Initiate attrs destroy to cleanup any remaining model references
      this.get('attrs').destroy();

      // Cancel all debounced timers
      validatableAttrs.forEach(attr => {
        let attrCache = get(debouncedValidations, attr);

        if (!isNone(attrCache)) {
          // Itterate over each attribute and cancel all of its debounced validations
          Object.keys(attrCache).forEach(v => run.cancel(attrCache[v]));
        }
      });
    }
  });

  ValidationsClass.reopenClass({
    [IS_VALIDATIONS_CLASS]: true
  });

  return ValidationsClass;
}

/**
 * Creates the `attrs` class which holds all the CP logic
 *
 * ```javascript
 * model.get('validations.attrs.username');
 * model.get('validations.attrs.nested.object.attribute');
 * ```
 *
 * @method createAttrsClass
 * @private
 * @param  {Object} validatableAttributes
 * @param  {Object} validationRules
 * @param  {Object} model
 * @return {Ember.Object}
 */
function createAttrsClass(validatableAttributes, validationRules, model) {
  let nestedClasses = {};
  let rootPath = 'root';

  let AttrsClass = EmberObject.extend({
    [ATTRS_PATH]: rootPath,

    init() {
      this._super(...arguments);

      let model = this.get(ATTRS_MODEL);
      let path = this.get(ATTRS_PATH);

      /*
        Instantiate the nested attrs classes for the current path
       */
      Object.keys(nestedClasses[path] || []).forEach(key => {
        set(
          this,
          key,
          nestedClasses[path][key].create({ [ATTRS_MODEL]: model })
        );
      });
    },

    willDestroy() {
      this._super(...arguments);

      let path = this.get(ATTRS_PATH);

      /*
        Remove the model reference
       */
      set(this, ATTRS_MODEL, null);

      /*
        Destroy all nested classes
       */
      Object.keys(nestedClasses[path] || []).forEach(key => {
        get(this, key).destroy();
      });
    }
  });

  /*
    Insert CPs + Create nested classes
   */
  validatableAttributes.forEach(attribute => {
    let path = attribute.split('.');
    let attr = path.pop();
    let currPath = [rootPath];
    let currClass = AttrsClass;

    // Iterate over the path and create the necessary nested classes along the way
    for (let i = 0; i < path.length; i++) {
      let key = path[i];
      let currPathStr = currPath.join('.');
      let _nestedClasses;

      nestedClasses[currPathStr] = nestedClasses[currPathStr] || {};
      _nestedClasses = nestedClasses[currPathStr];

      currPath.push(key);

      if (!_nestedClasses[key]) {
        _nestedClasses[key] = AttrsClass.extend({
          [ATTRS_PATH]: currPath.join('.')
        });
      }

      currClass = _nestedClasses[key];
    }

    // Add the final attr's CP to the class
    currClass.reopen({
      [attr]: createCPValidationFor(
        attribute,
        model,
        get(validationRules, attribute)
      )
    });
  });

  return AttrsClass;
}

/**
 * CP generator for the given attribute
 *
 * @method createCPValidationFor
 * @private
 * @param  {String} attribute
 * @param  {Object} model         Since the CPs are created once per class on the first initialization,
 *                                this is the first model that was instantiated
 * @param  {Array} validations
 * @return {Ember.ComputedProperty} A computed property which is a ResultCollection
 */
function createCPValidationFor(attribute, model, validations) {
  let isVolatile = hasOption(validations, 'volatile', true);
  let dependentKeys = isVolatile
    ? []
    : getCPDependentKeysFor(attribute, model, validations);

  let cp = computed(
    ...dependentKeys,
    cycleBreaker(function() {
      let model = get(this, ATTRS_MODEL);
      let validators = !isNone(model) ? getValidatorsFor(attribute, model) : [];

      let validationResults = generateValidationResultsFor(
        attribute,
        model,
        validators,
        (validator, options) => {
          return validator.validate(
            validator.getValue(),
            options,
            model,
            attribute
          );
        }
      );

      return ResultCollection.create({
        attribute,
        content: validationResults
      });
    })
  ).readOnly();

  if (isVolatile) {
    cp = cp.volatile();
  }

  return cp;
}

/**
 * Check if a collection of validations have an option
 * equal to the given value
 *
 * @method hasOption
 * @private
 * @param {Array} validations
 * @param {String} option
 * @param {Boolean} [value=true]
 * @returns {Boolean}
 */
function hasOption(validations, option, value = true) {
  for (let i = 0; i < validations.length; i++) {
    let { options, defaultOptions = {}, globalOptions = {} } = validations[i];
    let mergedOptions = mergeOptions(options, defaultOptions, globalOptions);

    if (mergedOptions[option] === value) {
      return true;
    }
  }

  return false;
}

/**
 * Generates the validation results for a given attribute and validators. If a
 * given validator should be validated, it calls upon the validate callback to retrieve
 * the result.
 *
 * @method generateValidationResultsFor
 * @private
 * @param  {String} attribute
 * @param  {Object} model
 * @param  {Array} validators
 * @param  {Function} validate
 * @param  {Object} opts
 *                    - disableDebounceCache {Boolean}
 * @return {Array}
 */
function generateValidationResultsFor(
  attribute,
  model,
  validators,
  validate,
  opts = {}
) {
  let isModelValidatable = isValidatable(model);
  let isInvalid = false;
  let value, result;

  return validators.map(validator => {
    let options = get(validator, 'options').toObject();
    let isWarning = getWithDefault(options, 'isWarning', false);
    let disabled = getWithDefault(options, 'disabled', false);
    let debounce = getWithDefault(options, 'debounce', 0);
    let lazy = getWithDefault(options, 'lazy', true);

    if (disabled || (lazy && isInvalid) || !isModelValidatable) {
      value = true;
    } else if (debounce > 0) {
      let cache = getDebouncedValidationsCacheFor(attribute, model);

      // Return a promise and pass the resolve method to the debounce handler
      value = new Promise(resolve => {
        let t = run.debounce(validator, resolveDebounce, resolve, debounce);

        if (!opts.disableDebounceCache) {
          cache[guidFor(validator)] = t;
        }
      }).then(() => {
        return validate(validator, get(validator, 'options').toObject());
      });
    } else {
      value = validate(validator, options);
    }

    result = validationReturnValueHandler(attribute, value, model, validator);

    /*
      If the current result is invalid, the rest of the validations do not need to be
      triggered (if lazy) since the attribute is already in an invalid state.
     */
    if (!isInvalid && !isWarning && get(result, 'isInvalid')) {
      isInvalid = true;
    }

    return result;
  });
}

/**
 * Create a mixin that will have all the top level CPs under the validations object.
 * These are computed collections on different properties of each attribute validations CP
 *
 * @method createTopLevelPropsMixin
 * @private
 * @param  {Object} validations
 */
function createTopLevelPropsMixin(validatableAttrs) {
  // Expose the following properties as public APIs via readOnly aliases
  let aliases = [
    'isValid',
    'isValidating',
    'isAsync',
    'isNotValidating',
    'isInvalid',
    'isTruelyValid',
    'isTruelyInvalid',
    'hasWarnings',
    'messages',
    'message',
    'warningMessages',
    'warningMessage',
    'warnings',
    'warning',
    'errors',
    'error',
    '_promise'
  ];

  let topLevelProps = aliases.reduce((props, alias) => {
    props[alias] = readOnly(`${ATTRS_RESULT_COLLECTION}.${alias}`);
    return props;
  }, {});

  return Mixin.create(topLevelProps, {
    /*
      Dedupe logic by creating a top level ResultCollection for all attr's ResultCollections
     */
    [ATTRS_RESULT_COLLECTION]: computed(
      ...validatableAttrs.map(attr => `attrs.${attr}`),
      function() {
        return ResultCollection.create({
          attribute: `Model:${this}`,
          content: validatableAttrs.map(attr => get(this, `attrs.${attr}`))
        });
      }
    ).readOnly()
  });
}

/**
 * CP dependency generator for a give attribute depending on its relationships
 *
 * @method getCPDependentKeysFor
 * @private
 * @param  {String} attribute
 * @param  {Object} model         Since the CPs are created once per class on the first initialization,
 *                                this is the first model that was instantiated
 * @param  {Array} validations
 * @return {Array} Unique list of dependencies
 */
function getCPDependentKeysFor(attribute, model, validations) {
  let owner = getOwner(model);

  let dependentKeys = validations.map(validation => {
    let { options } = validation;
    let type = validation._type;
    let Validator =
      type === 'function' ? BaseValidator : lookupValidator(owner, type).class;
    let baseDependents =
      BaseValidator.getDependentsFor(attribute, options) || [];
    let dependents = Validator.getDependentsFor(attribute, options) || [];

    return [
      ...baseDependents,
      ...dependents,

      // Get all explicitly defined dependents
      ...getWithDefault(options, 'dependentKeys', []),
      ...getWithDefault(validation, 'defaultOptions.dependentKeys', []),
      ...getWithDefault(validation, 'globalOptions.dependentKeys', []),

      // Extract implicit dependents from CPs
      ...extractOptionsDependentKeys(options),
      ...extractOptionsDependentKeys(get(validation, 'defaultOptions')),
      ...extractOptionsDependentKeys(get(validation, 'globalOptions'))
    ];
  });

  dependentKeys = flatten(dependentKeys);

  dependentKeys.push(`model.${attribute}`);

  if (isDsModel(model)) {
    dependentKeys.push('model.isDeleted');
  }

  dependentKeys = dependentKeys.map(d => {
    return d.replace(/^model\./, `${ATTRS_MODEL}.`);
  });

  return emberArray(dependentKeys).uniq();
}

/**
 * Extract all dependentKeys from any property that is a CP
 *
 * @method extractOptionsDependentKeys
 * @private
 * @param  {Object} options
 * @return {Array}  dependentKeys
 */
function extractOptionsDependentKeys(options) {
  if (options && typeof options === 'object') {
    return Object.keys(options).reduce((arr, key) => {
      let option = options[key];

      if (isDescriptor(option)) {
        return arr.concat(getDependentKeys(option) || []);
      }

      return arr;
    }, []);
  }

  return [];
}

/**
 * A handler used to create ValidationResult object from values returned from a validator
 *
 * @method validationReturnValueHandler
 * @private
 * @param  {String} attribute
 * @param  {Mixed} value
 * @param  {Object} model
 * @return {ValidationResult}
 */
function validationReturnValueHandler(attribute, value, model, validator) {
  let result;
  let commonProps = {
    model,
    attribute,
    _validator: validator
  };

  if (isPromise(value)) {
    result = ValidationResult.create(commonProps, {
      _promise: Promise.resolve(value)
    });
  } else {
    result = ValidationResult.create(commonProps);
    result.update(value);
  }

  return result;
}

/**
 * Get validators for the give attribute. If they are not in the cache, then create them.
 *
 * @method getValidatorsFor
 * @private
 * @param  {String} attribute
 * @param  {Object} model
 * @return {Array}
 */
function getValidatorsFor(attribute, model) {
  let validators = get(model, `validations._validators.${attribute}`);
  return isNone(validators)
    ? createValidatorsFor(attribute, model)
    : validators;
}

/**
 * Get debounced validation cache for the given attribute. If it doesn't exist, create a new one.
 *
 * @method getValidatorCacheFor
 * @private
 * @param  {String} attribute
 * @param  {Object} model
 * @return {Map}
 */
function getDebouncedValidationsCacheFor(attribute, model) {
  let debouncedValidations = get(model, 'validations._debouncedValidations');

  if (isNone(get(debouncedValidations, attribute))) {
    deepSet(debouncedValidations, attribute, {});
  }

  return get(debouncedValidations, attribute);
}

/**
 * Create validators for the give attribute and store them in a cache
 *
 * @method createValidatorsFor
 * @private
 * @param  {String} attribute
 * @param  {Object} model
 * @return {Array}
 */
function createValidatorsFor(attribute, model) {
  let validations = get(model, 'validations');
  let validationRules = makeArray(
    get(validations, `_validationRules.${attribute}`)
  );
  let validatorCache = get(validations, '_validators');
  let owner = getOwner(model);
  let validators = [];

  // We must have an owner to be able to lookup our validators
  if (isNone(owner)) {
    throw new TypeError(
      `[ember-cp-validations] ${model.toString()} is missing a container or owner.`
    );
  }

  validationRules.forEach(v => {
    v.attribute = attribute;
    v.model = model;
    validators.push(lookupValidator(owner, v._type).create(v));
  });

  // Add validators to model instance cache
  deepSet(validatorCache, attribute, validators);

  return validators;
}

/**
 * Call the passed resolve method. This is needed as run.debounce expects a
 * static method to work properly.
 *
 * @method resolveDebounce
 * @private
 * @param  {Function} resolve
 */
function resolveDebounce(resolve) {
  resolve();
}

/**
 * ```javascript
 * model.validate({ on: ['username', 'email'] }).then(({ m, validations }) => {
 *   validations.get('isValid'); // true or false
 *   validations.get('isValidating'); // false
 *
 *   let usernameValidations = m.get('validations.attrs.username');
 *   usernameValidations.get('isValid') // true or false
 * });
 * ```
 *
 * @method validate
 * @param  {Object} options
 * @param  {Array} options.on Only validate the given attributes. If empty, will validate over all validatable attribute
 * @param  {Array} options.excludes Exclude validation on the given attributes
 * @param  {Boolean} isAsync      If `false`, will get all validations and will error if an async validations is found.
 *                              If `true`, will get all validations and wrap them in a promise hash
 * @return {Promise or Object}  Promise if isAsync is true, object if isAsync is false
 */
function validate(options = {}, isAsync = true) {
  let model = get(this, 'model');
  let whiteList = makeArray(options.on);
  let blackList = makeArray(options.excludes);

  let validationResults = get(this, 'validatableAttributes').reduce(
    (v, name) => {
      if (!isEmpty(blackList) && blackList.indexOf(name) !== -1) {
        return v;
      }

      if (isEmpty(whiteList) || whiteList.indexOf(name) !== -1) {
        let validationResult = get(this, `attrs.${name}`);

        // If an async validation is found, throw an error
        if (!isAsync && get(validationResult, 'isAsync')) {
          throw new Error(
            `[ember-cp-validations] Synchronous validation failed due to ${name} being an async validation.`
          );
        }

        v.push(validationResult);
      }

      return v;
    },
    []
  );

  let validations = ResultCollection.create({
    attribute: `Validate:${model}`,
    content: validationResults
  });

  let resultObject = { model, validations };

  if (isAsync) {
    return Promise.resolve(get(validations, '_promise')).then(() => {
      /*
        NOTE: When dealing with belongsTo and hasMany relationships, there are cases
        where we have to resolve the actual models and only then resolve all the underlying
        validation promises. This is the reason that `validate` must be called recursively.
       */
      return get(validations, 'isValidating')
        ? this.validate(options, isAsync)
        : resultObject;
    });
  }

  return resultObject;
}

/**
 * A functional approach to check if a given attribute on a model is valid independently of the
 * model attribute's validations. This method will always return a promise which will then resolve
 * to a {{#crossLink "ResultCollection"}}{{/crossLink}}.
 *
 * ```javascript
 * model.validateAttribute('username', 'offirgolan').then(({ m, validations }) => {
 *   validations.get('isValid'); // true or false
 *   validations.get('isValidating'); // false
 * });
 * ```
 *
 * @method validateAttribute
 * @param  {String}   attribute
 * @param  {Mixed}  value
 * @return {Promise}
 * @async
 */
function validateAttribute(attribute, value) {
  let model = get(this, 'model');
  let validators = !isNone(model) ? getValidatorsFor(attribute, model) : [];

  let validationResults = generateValidationResultsFor(
    attribute,
    model,
    validators,
    (validator, options) => {
      return validator.validate(value, options, model, attribute);
    },
    {
      disableDebounceCache: true
    }
  );

  let validations = ResultCollection.create({
    attribute,
    content: flatten(validationResults)
  });

  let result = { model, validations };

  return Promise.resolve(get(validations, '_promise')).then(() => {
    /*
      NOTE: When dealing with belongsTo and hasMany relationships, there are cases
      where we have to resolve the actual models and only then resolve all the underlying
      validation promises. This is the reason that `validateAttribute` must be called recursively.
     */
    return get(validations, 'isValidating')
      ? this.validateAttribute(attribute, value)
      : result;
  });
}

/**
 * ```javascript
 * let { m, validations } = model.validateSync();
 * validations.get('isValid') // true or false
 * ```
 *
 * @method validateSync
 * @param  {Object}  options
 * @param  {Array} options.on Only validate the given attributes. If empty, will validate over all validatable attribute
 * @param  {Array} options.excludes Exclude validation on the given attributes
 * @return {Object}
 */
function validateSync(options) {
  return this.validate(options, false);
}