This is a validation module for Swagger models Node.js.
See the swagger-node-express sample for more details about Swagger in Node.js.
The goal of Swagger™ is to define a standard, language-agnostic interface to REST APIs which allows both humans and computers to discover and understand the capabilities of the service without access to source code, documentation, or through network traffic inspection. When properly defined via Swagger, a consumer can understand and interact with the remote service with a minimal amount of implementation logic. Similar to what interfaces have done for lower-level programming, Swager removes the guesswork in calling the service.
Check out Swagger-Spec for additional information about the Swagger project, including additional libraries with support for other languages and more.
A Swagger Model contains the definitions of the incoming (or outgoing) object properties. Validating an incoming object matches the Swagger Model Definition is a valuable check that the correct data has been provided.
This package provides a module to do just that.
This project should work against both Swagger 1.2 and Swagger 2.0. Please create a pull request if you have any fixes for Swagger 2.0 support but please remember to retain support for Swagger 1.2 as well.
It will validate int32 properly but the way javascript handles int64 makes it impossible to accurately validate int64s. As long as the value can be parsed by parseInt in javascript it will be accepted as an int64.
It currently treats float and decimal the same but this is because javascript cannot cope with a decimal (at the moment). As long as the value can be parsed by parseFloat in javascript it will be accepted as a float or a decimal.
It validates the date and date-time correctly. It treats all dates (and date-times) as dates and tests with a parseDate check. If this passes then it checks 'date' format against a length of 10 (a quick check against the ISO8601 standard, a full-date must be 10 characters long).
As from version 0.3 it will now validate models referenced by the $ref keyword but it will only do this if it is called by the swagger function validateModel or if the native validate is called with a model array passed in.
As from version 1.0.0 it will now validate arrays in models. It will validate arrays of a type and arrays of a $ref.
Install swagger-model-validator
npm install swagger-model-validator
Create a validator and pass your swagger client into it.
var Validator = require('swagger-model-validator');
var validator = new Validator(swagger);
Now you can call validateModel on swagger to validate an incoming json object.
var validation = swagger.validateModel("modelName", jsonObject, _allowBlankTarget_, _disallowExtraProperties_);
This returns a validation results object
{
valid: true,
errorCount: 0
}
or if validation fails
{
valid: false,
errorCount: 2,
errors: [
{
name: 'Error',
message: 'An error occurred'
},
{
name: 'Error',
message: 'Another error occurred'
}
]
}
You can also call the validation directly
var validation = validator.validate(object, swaggerModel, swaggerModels, allowBlankTarget, disallowExtraProperties);
will return the same validation results but requires the actual swagger model and not its name. The swaggerModels parameter is required if you want models referenced by the $ref keyword to be validated as well.
From 1.0.2 any empty objects passed in as targets will fail validation. You can bypass this by adding a true value to
the method at the end.
var validation = swagger.validateModel("modelName", target, true);
This will allow an empty object { } to be validated without errors. We consider a blank object to be worthless in most
cases and so should normally fail, but there is always the chance that it might not be worthless so we've added the bypass.
From 1.2 an optional parameter can be passed into the validation request to control if extra properties should be disallowed. If this flag is true then the target object cannot contain any properties that are not defined on the model. If it is blank or false then the target object can include extra properties (this is the default behaviour and the same as pre 1.2)
var validation = swagger.validateModel("modelName", target, true, true);
You can add a custom field validator for a model to the validator from version 1.0.3 onwards. This allows you to add a function that will be called for any specific field that you need validated with extra rules.
This function should be in the form
function(name, value) {
if(error) {
return new Error(error);
} else {
return null;
}
}
It can return either a single Error object or an array of error objects. These errors will be passed back through the validator to the end user.
Simply make a call to the validator method addFieldValidator providing the modelName, fieldName and
the validation function.
validator.addFieldValidator("testModel", "id", function(name, value) {
var errors = []
if(value === 34) {
errors.push(new Error("Value Cannot be 34"));
}
if(value < 40) {
errors.push(new Error("Value must be at least 40"));
}
return errors.length > 0 ? errors : null;
});
Now the validator will call this extra function for the 'id' field in the 'testModel' model.
You can add multiple custom validators to the same field. They will all be run. If a validator throws an exception it will be ignored and validation will continue.
Be careful with the results as javascript Errors cannot be turned into JSON without losing the message property.
We have added two methods to help with this.
GetErrorMessages() which returns an array of strings (one for each error) which contain the text of the error.message property. GetFormattedErrors() which returns an array of objects (one for each error) which contains all of the custom properties for each error and the text of the error.message property.
Just passing the Validation Response errors array out will result in the loss of the error.message property. Most errors would appear as empty objects.
Copyright (c) 2014 Atlantis Healthcare Limited.
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