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Validation

Route validation

Validation in the rest-hapi framework is implemented with joi. This includes validation of headers, query parameters, payloads, and responses. joi validation models are based primarily off of each model's field properties. Below is a list of mongoose schema types and their joi equivalent within rest-hapi:

Schema Type	joi Validation
ObjectId	Joi.objectId() (via joi-objectid)
Boolean	Joi.bool()
Number	Joi.number()
Date	Joi.date()
String	Joi.string()
types	Joi.any()

Fields of type String can include further validation restrictions based on additional field properties as shown below:

Field Property	joi Validation
enum: [items]	Joi.string().valid(...[items])
regex: RegExp	Joi.string().regex(RegExp)
stringType: 'email'	Joi.string().email()
stringType: 'uri'	Joi.string().uri()
stringType: 'token'	Joi.string().token()
stringType: 'base64'	Joi.string().base64()
stringType: 'lowercase'	Joi.string().lowercase()
stringType: 'uppercase'	Joi.string().uppercase()
stringType: 'hostname'	Joi.string().hostname()
stringType: 'hex'	Joi.string().hex()
stringType: 'trim'	Joi.string().trim()
stringType: 'creditCard'	Joi.string().creditCard()

In addition, if a description: "Description text." field property is included, then .description("Description text.") will be called on the joi validation object.

Furthermore, the regex field can also accept an object that follows the formatting below. See Joi regex options.

{
 pattern: RegExp,
 options: {
  invert: Boolean
 }
}

rest-hapi generates joi validation models for create, read, and update events as well as association events with linking models. By default these validation models include all the fields of the mongoose models and list them as optional. However additional field properties can be included to customize the validation models. Below is a list of currently supported field properties and their effect on the validation models.

Field Property	Validation Model
required: true	field required on create
requireOnRead: true	field required on read/response
requireOnUpdate: true	field required on update
allowOnRead: false	field excluded from read model
allowOnUpdate: false	field excluded from update model
allowOnCreate: false	field excluded from create model
queryable: false	field cannot be included as a query parameter
exclude: true	field cannot be included in a response or as part of a query
allowNull: true	field accepts null as a valid value

Hapi Validation Response

By default hapi will not respond with details of validation failures for security reasons. If you would like to see these details you need to sepcify a failAction for validation like so:

const server = Hapi.Server({
    routes: {
        validate: {
            failAction: async (request, h, err) => {
                RestHapi.logger.error(err)
                throw err
            }
        }
    }
})

Using Joi in custom endpoints

As of rest-hapi v2.0, if you create standalone or additional endpoints, you must either use the rest-hapi joi object or wrap validate properties in Joi.object as described in the hapi notes. You can access the rest-hapi joi object as a global rest-hapi property like so:

              validate: {
                payload: {
                  password: RestHapi.joi.string()
                    .required()
                    .description("The user's new password")
                }
              },

Joi helper methods

rest-hapi exposes the helper methods it uses to generate Joi models through the joiHelper property. Combined with the exposed mongoose wrapper methods, this allows you to easily create custom endpoints. You can see a description of these methods below:

generateJoiReadModel

/**
 * Generates a Joi object that validates a query result for a specific model
 * @param model: A mongoose model object.
 * @param Log: A logging object.
 * @returns {*}: A Joi object
 */
generateJoiReadModel = function (model, Log) {...};

generateJoiUpdateModel

/**
 * Generates a Joi object that validates a query request payload for updating a document
 * @param model: A mongoose model object.
 * @param Log: A logging object.
 * @returns {*}: A Joi object
 */
generateJoiUpdateModel = function (model, Log) {...};

generateJoiCreateModel

/**
 * Generates a Joi object that validates a request payload for creating a document
 * @param model: A mongoose model object.
 * @param Log: A logging object.
 * @returns {*}: A Joi object
 */
generateJoiCreateModel = function (model, Log) {...};

generateJoiListQueryModel

/**
 * Generates a Joi object that validates a request query for the list function
 * @param model: A mongoose model object.
 * @param Log: A logging object.
 * @returns {*}: A Joi object
 */
generateJoiListQueryModel = function (model, Log) {...};

generateJoiFindQueryModel

/**
 * Generates a Joi object that validates a request query for the find function
 * @param model: A mongoose model object.
 * @param Log: A logging object.
 * @returns {*}: A Joi object
 */
generateJoiFindQueryModel = function (model, Log) {...};

generateJoiFieldModel

/**
 * Generates a Joi object for a model field
 * @param model: A mongoose model object
 * @param field: A model field
 * @param fieldName: The name of the field
 * @param modelType: The type of CRUD model being generated
 * @param Log: A logging object
 * @returns {*}: A Joi object
 */
generateJoiFieldModel = function (model, field, fieldName, modelType, Log) {...};

generateJoiModelFromFieldType

/**
 * Returns a Joi object based on the mongoose field type.
 * @param field: A field from a mongoose model.
 * @param Log: A logging object.
 * @returns {*}: A Joi object.
 */
generateJoiModelFromFieldType = function (field, Log) {...};

joiObjectId

/**
 * Provides easy access to the Joi ObjectId type.
 * @returns {*|{type}}
 */
joiObjectId = function () {...};

isValidField

/**
 * Checks to see if a field is a valid model property
 * @param fieldName: The name of the field
 * @param field: The field being checked
 * @param model: A mongoose model object
 * @returns {boolean}
 */
isValidField = function (fieldName, field, model) {...};