Express middleware for openapi response validation.
Moving forward you can use openapi-response-validator. See express-openapi for an example.
Provides a .validateResponse method to express response objects. If the method
returns a value, it will be a validation error with status: 500, a message, and
an optional array of errors.
* Performant.
* Extensively tested.
* Small footprint.
* Leverages jsonschema.
* Currently supports openapi 2.0 (a.k.a. swagger 2.0) responses objects.
* Supports $ref in response schemas i.e. #/definitions/SomeType.
See ./test/data-driven/*.js for more examples.
``javascript
var app = require('express')();
var validateResponseMiddleware = require('express-openapi-response-validation')({
responses: {
200: {
description: 'We found what you were looking for.',
schema: {
$ref: '#/definitions/ResourceResponse'
}
},
default: {
description: 'Something happened...',
schema: {
$ref: '#/definitions/SomeErrorResponse'
}
}
},
definitions: {
ResourceResponse: {
type: 'object',
properties: {
id: {
type: 'integer'
},
name: {
type: 'string'
}
},
required: ['id', 'name']
},
SomeErrorResponse: {
type: 'object',
properties: {
errorCode: {
type: 'string'
},
message: {
type: 'string'
}
}
}
}
});
app.get('/something', validateResponseMiddleware, function(req, res, next) {
var someResource = {};
var validationError = res.validateResponse(200, someResource);
/*
Validation errors look like this (except for objects in the errors array which
may be overridden with errorTransformer):
{
status: 500,
message: 'The response was not valid.',
errors: [
{
path: 'foo',
errorCode: 'type.openapi.responseValidation',
message: 'foo is not of a type(s) string'
}
]
}
*/
if (validationError) {
return next(validationError);
} else {
res.status(200, someResource);
}
});
`
Returns an express middleware function.
#### args
|Type|Required|Default Value|Description|
|----|--------|-------------|-----------|
|Object|Y|N/A|Arguments to configure the middleware.|
#### args.responses
|Type|Required|Default Value|Description|
|----|--------|-------------|-----------|
|Object|Y|N/A|A key value pair of response definitions. At least one response definition is to be provided.|
Keys may be any HTTP status code or default (for all HTTP status codes). See
http://swagger.io/specification/#responsesObject.
#### args.definitions
|Type|Required|Default Value|Description|
|----|--------|-------------|-----------|
|Object|N|N/A|A key value pair of type definitions|
This object is used to support $ref in your responses
#### args.errorTransformer
|Type|Required|Default Value|Description|
|----|--------|-------------|-----------|
|Function|N|toOpenapiValidationError (see the source)|A function that receives an error and returns a mapped version of the error.|
This function is passed 2 arguments.
`
errorTransformer: function(openapiError, jsonschemaError) {
return {
message: openapiError.message
};
}
See the error format in jsonschema for
jsonschemaError. openapiErrors have the following properties:
* errorCode - A jsonschema error suffixed with .openapi.validation.message
failed.
* - A detailed message as to why validation failed.path
* - The property of the response body that failed validation.
#### args.customFormats
|Type|Required|Default Value|Description|
|----|--------|-------------|-----------|
|Object|N|null|An object of custom formats.|
Each key is the name of the format to be used with the format keyword. Each value
is a function that accepts an input and returns a boolean value.
See Custom Formats in jsonschema.
The MIT License (MIT)Copyright (c) 2016 Kogo Software LLC
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