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https://github.com/jaredce/serverless-openapi-documenter
Serverless plugin to export your config as OpenAPI v3 Documentation and Postman Collection V2
https://github.com/jaredce/serverless-openapi-documenter
openapi openapi-documentation openapi-generator openapi3 serverless serverless-framework
Last synced: 3 days ago
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Serverless plugin to export your config as OpenAPI v3 Documentation and Postman Collection V2
- Host: GitHub
- URL: https://github.com/jaredce/serverless-openapi-documenter
- Owner: JaredCE
- License: mit
- Created: 2022-05-23T21:49:03.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2024-09-25T15:28:36.000Z (8 days ago)
- Last Synced: 2024-09-30T15:10:05.737Z (3 days ago)
- Topics: openapi, openapi-documentation, openapi-generator, openapi3, serverless, serverless-framework
- Language: JavaScript
- Homepage:
- Size: 971 KB
- Stars: 42
- Watchers: 1
- Forks: 13
- Open Issues: 14
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# OpenAPI Generator for serverless
This will generate an OpenAPI V3 (up to v3.0.3) file for you from your serverless file. It can optionally generate a [Postman Collection V2](https://github.com/postmanlabs/openapi-to-postman) from the OpenAPI file for you too. This currently works for `http` and `httpApi` configurations.
Originally based off of: https://github.com/temando/serverless-openapi-documentation
## Install
This plugin works for Serverless (2.x, 3.x and 4.x) and only supports node.js 14 and up.
To add this plugin to your package.json:
**Using npm:**
```bash
npm install --save-dev serverless-openapi-documenter
```
Next you need to add the plugin to the `plugins` section of your `serverless.yml` file.
```yml
plugins:
- serverless-openapi-documenter
```
> Note: Add this plugin _after_ `serverless-offline` to prevent issues with `String.replaceAll` being overridden incorrectly.
## Adding documentation to serverless
To Run: `serverless openapi generate -o openapi.json -f json -a 3.0.3 -p postman.json`
Options:
```
--output -o What filename the OpenAPI Description should output under. Default: openapi.json
--format -f Whether to output the OpenAPI Description as json or yaml. Default: json
--indent -i File indentation in spaces. Default: 2
--openApiVersion -a OpenAPI version to generate for. Default: 3.0.0
--postmanCollection -p Will generate a postman collection (from the generated OpenAPI Description), in json only, if passed in. Default: postman.json
--validationWarn -w Warn about validation errors only. Will write the OpenAPI file if generation is successful. Default: false
```
### README Highlighted Reading
#### Security Details
- [Security](#securityschemes)
- [Security on All Operations](#security-on-each-operation)
- [Security Per Operation](#security)
#### Model Details
- [Models](#models)
- [Notes on Schemas](#notes-on-schemas)
- [Request Schema Validators](#serverless-request-schema-validators)
#### Response Headers
- [CORS](#cors)
- [OWASP Secure Headers](#owasp)
#### Validation
- [Validation](#validator)
### OpenAPI Mapping
| OpenAPI field | Serverless field |
| --------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- |
| info.title | `custom.documentation.title` OR service |
| info.description | `custom.documentation.description` OR blank string |
| info.version | `custom.documentation.version` OR random v4 uuid if not provided |
| info.termsOfService | `custom.documentation.termsOfService` |
| info.contact | custom.documentation.contact |
| info.contact.name | `custom.documentation.contact.name` OR blank string |
| info.contact.url | `custom.documentation.contact.url` if provided |
| info.contact.x- | `custom.documentation.contact.x-` extended specifications provided |
| info.license | custom.documentation.license |
| info.license.name | `custom.documentation.license.name` OR blank string |
| info.license.url | `custom.documentation.license.url` if provided |
| info.license.x- | `custom.documentation.license.x-` if extended specifications provided provided |
| externalDocs.description | `custom.documentation.externalDocumentation.description ` |
| externalDocs.url | `custom.documentation.externalDocumentation.url` |
| x-tagGroups | `custom.documentation.x-tagGroups` if provided |
| security | `custom.documentation.security` |
| servers[].description | custom.documentation.servers.description |
| servers[].url | custom.documentation.servers.url |
| servers[].variables | custom.documentation.servers.variables |
| tags[].name | `custom.documentation.tags.name` |
| tags[].description | `custom.documentation.tags.description` |
| tags[].externalDocs.url | `custom.documentation.tags.externalDocumentation.url` |
| tags[].externalDocs.description | `custom.documentation.tags.externalDocumentation.description` |
| tags[].externalDocs.x- | `custom.documentation.tags.externalDocumentation.x-` if extended specifications provided |
| path[path] | functions.functions.events.[http OR httpApi].path |
| path[path].servers[].description | functions.functions.servers.description |
| path[path].servers[].url | functions.functions.servers.url |
| path[path].[operation] | functions.functions.[http OR httpApi].method |
| path[path].[operation].summary | functions.functions.[http OR httpApi].documentation.summary |
| path[path].[operation].description | functions.functions.[http OR httpApi].documentation.description |
| path[path].[operation].operationId | functions.functions.[http OR httpApi].documentation.operationId OR functionName |
| path[path].[operation].deprecated | functions.functions.[http OR httpApi].documentation.deprecated |
| path[path].[operation].externalDocs.description | functions.functions.[http OR httpApi].documentation.externalDocumentation.description |
| path[path].[operation].externalDocs.url | functions.functions.[http OR httpApi].documentation.externalDocumentation.url |
| path[path].[operation].servers[].description | functions.functions.[http OR httpApi].documentation.servers.description |
| path[path].[operation].servers[].url | functions.functions.[http OR httpApi].documentation.servers.url |
| path[path].[operation].security | functions.functions.[http OR httpApi].documentation.security |
| path[path].[operation].deprecated | functions.functions.[http OR httpApi].documentation.deprecated |
| path[path].[operation].parameters | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params |
| path[path].[operation].parameters.name | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params.name |
| path[path].[operation].parameters.in | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params |
| path[path].[operation].parameters.description | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params.description |
| path[path].[operation].parameters.required | functions.functions.[http OR httpApi].documentation.[query/cookie/header]Params.required |
| path[path].[operation].parameters.deprecated | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params.deprecated |
| path[path].[operation].parameters.allowEmptyValue | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params.allowEmptyValue |
| path[path].[operation].parameters.style | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params.style |
| path[path].[operation].parameters.explode | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params.explode |
| path[path].[operation].parameters.allowReserved | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params.allowReserved |
| path[path].[operation].parameters.schema | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params.schema |
| path[path].[operation].parameters.example | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params.example |
| path[path].[operation].parameters.examples | functions.functions.[http OR httpApi].documentation.[path/query/cookie/header]Params.examples |
| path[path].[operation].requestBody | functions.functions.[http OR httpApi].documentation.requestBody |
| path[path].[operation].requestBody.description | functions.functions.[http OR httpApi].documentation.requestBody.description |
| path[path].[operation].requestBody.required | functions.functions.[http OR httpApi].documentation.requestBody.required |
| path[path].[operation].requestBody.content | functions.functions.[http OR httpApi].documentation.requestModels[contentType].name Links to custom.documentation.models.name |
| path[path].[operation].responses | functions.functions.[http OR httpApi].documentation.methodResponses |
| path[path].[operation].responses.[statusCode] | functions.functions.[http OR httpApi].documentation.methodResponses[statusCode] |
| path[path].[operation].responses.[statusCode].description | functions.functions.[http OR httpApi].documentation.methodResponses[statusCode].responseBody.description |
| path[path].[operation].responses.[statusCode].content | functions.functions.[http OR httpApi].documentation.methodResponses[statusCode].responseModels[contentType] Links to custom.documentation.models.name |
### Configuration
To configure this plugin to generate a valid OpenAPI Description, there are two places you'll need to modify in your `serverless.yml` file, the `custom` variables section and the `http/httpApi` event section for each given function in your service.
The `custom` section of your `serverless.yml` can be configured as below:
```yml
custom:
documentation:
version: "1"
title: "My API"
description: "This is my API"
termsOfService: https://google.com
externalDocumentation:
url: https://google.com
description: A link to google
servers:
url: https://example.com:{port}/
description: The server
variables:
port:
enum:
- 4000
- 3000
default: 3000
description: The port the server operates on
tags:
- name: tag1
description: this is a tag
externalDocumentation:
url: https://npmjs.com
description: A link to npm
models: {}
```
Mostly everything here is optional. A version from a UUID will be generated for you if you don't specify one, title will be the name of your service if you don't specify one. You will need to specify the `documentation` top object.
#### termsOfService
Must be in the format of a url if included.
#### Contact
You can provide an optional contact object such as:
```yml
custom:
documentation:
contact:
name: John
url: https://example.com
email: [email protected]
```
These fields are optional, though `url` needs to in the form of a URL and `email` needs to be in the format of an email address (ed: what that might be, I'm not 100% sure... go read the email RFC(s)).
This can be extended using the `^x-` specification extension.
#### License
You can provide an optional license object such as:
```yml
custom:
documentation:
license:
name: Apache 2.0
url: https://www.apache.org/licenses/LICENSE-2.0.html
```
Name is required but `url` is optional and must be in the format of a url.
This can be extended using the `^x-` specification extension.
#### Extended Fields
You can also add extended fields to the documentation object:
```yml
custom:
documentation:
x-other-field: This is an extended field
```
These fields must have `x-` before them, otherwise they will be ignored:
```yml
custom:
documentation:
other-field: This is an extended field
```
`other-field` here will not make it to the generated OpenAPI schema.
Currently extended specification fields defined under the `documentation` tag will sit under the OpenAPI `info` object e.g.
```yml
custom:
documentation:
title: myService
x-other-field: This is an extended field
```
converts to:
```json
{
"info": {
"title": "myService",
"x-other-field": "This is an extended field"
}
}
```
An exception to this is Redocly `x-tagGroups`. If defined, they will sit at the root level of the OpenAPI specification, e.g.
```yml
custom:
documentation:
title: myService
x-other-field: This is an extended field
x-tagGroups:
- name: Customers
tags:
- Customers
```
converts to:
```json
{
"info": {
"title": "myService",
"x-other-field": "This is an extended field"
},
"x-tagGroups": [
{
"name": "Customers",
"tags": ["Customers"]
}
]
}
```
#### Moving documentation to a separate file
These configurations can be quite verbose; you can separate it out into it's own file, such as `serverless.doc.yml` as below:
```yml
custom:
documentation: ${file(serverless.doc.yml):documentation}
functions:
myFunc:
events:
- http:
path: getStuff
method: get
documentation: ${file(serverless.doc.yml):endpoints.myFunc}
```
For more info on `serverless.yml` syntax, see their docs.
#### securitySchemes
You can provide optional Security Schemes:
```yml
custom:
documentation:
securitySchemes:
my_api_key:
type: apiKey
name: api_key
in: header
```
It accepts all available Security Schemes and follows the specification: https://spec.openapis.org/oas/v3.0.3#security-scheme-object
#### Security on each operation
To apply an overall security scheme to all of your operations without having to add the documentation to each one, you can write it like:
```yml
custom:
documentation:
securitySchemes:
my_api_key:
type: apiKey
name: api_key
in: header
security:
- my_api_key: []
```
This will apply the requirement of each operation requiring your `my_api_key` security scheme, [you can override this](#security).
#### Models
There are two ways to write the Models. Models contain additional information that you can use to define schemas for endpoints. You must define the _content type_ for each schema that you provide in the models.
The first way of writing the model is:
_required_ directives for the models section are as follow:
- `name`: the name of the schema
- `description`: a description of the schema
- `contentType`: the content type of the described request/response (ie. `application/json` or `application/xml`).
- `schema`: The JSON Schema ([website](http://json-schema.org/)) that describes the model. You can either use inline `YAML` to define these or use either an external file schema that serverless will resolve (as below), or a reference to an externally hosted schema that will be attempted to be resolved.
```yml
custom:
documentation:
models:
- name: "ErrorResponse"
description: "This is an error"
contentType: "application/json"
schema: ${file(models/ErrorResponse.json)}
- name: "PutDocumentResponse"
description: "PUT Document response model (external reference example)"
contentType: "application/json"
schema: ${file(models/PutDocumentResponse.json)}
- name: "PutDocumentRequest"
description: "PUT Document request model (inline example)"
contentType: "application/json"
schema:
$schema: "http://json-schema.org/draft-04/schema#"
type: object
properties:
SomeObject:
type: "object"
properties:
SomeAttribute:
type: "string"
examples:
- name: someObjectInlineExample
summary: an example of a request
description: a longer string than the summary
value: { SomeObject: { SomeAttribute: "attribute" } }
- name: someObjectExternalExample
summary: an example of a request external
description: a longer string than the summary
externalValue: https://example.com/external.json
```
The Second way of writing the models:
- `name`: the name of the schema
- `description`: a description of the schema
- `content`: an Object made up of the contentType and the schema, as shown below
```yml
custom:
documentation:
models:
- name: "ErrorResponse"
description: "This is an error"
content:
application/json:
schema: ${file(models/ErrorResponse.json)}
- name: "PutDocumentResponse"
description: "PUT Document response model (external reference example)"
content:
application/json:
schema: ${file(models/PutDocumentResponse.json)}
- name: "PutDocumentRequest"
description: "PUT Document request model (inline example)"
content:
application/json:
schema:
$schema: "http://json-schema.org/draft-04/schema#"
type: object
properties:
SomeObject:
type: "object"
properties:
SomeAttribute:
type: "string"
examples:
- name: someObjectInlineExample
summary: an example of a request
description: a longer string than the summary
value: { SomeObject: { SomeAttribute: "attribute" } }
- name: someObjectExternalExample
summary: an example of a request external
description: a longer string than the summary
externalValue: https://example.com/external.json
```
##### Model re-use
Through the magic of YAML, you can re-use models:
```yml
custom:
documentation:
...
models:
- name: "ErrorResponse"
description: "This is an error"
content:
application/json:
schema: &ErrorItem
type: object
properties:
message:
type: string
code:
type: integer
- name: "PutDocumentResponse"
description: "PUT Document response model (external reference example)"
content:
application/json:
schema:
type: array
items: *ErrorItem
```
`&ErrorItem` in the above example creates a node anchor (&ErrorItem) to the `ErrorResponse` schema which then can be used in the `PutDocumentResponse` schema via the reference (\*ErrorItem). The node anchor needs to be declared first before it can be used elsewhere via the reference, swapping the above example around would result in an error.
##### ModelsList - Backwards compatibility
It was brought to my attention that an older plugin version allowed the use of `modelsList`. As of 0.0.60, you can continue to use `modelsList` as well as using `models`, however `modelsList` now has to be nested within the `documentation` section. You can write `modelsList` the same way as any of the two styles for [Models](#Models).
```
custom:
documentation:
...
modelsList:
- name: "ErrorResponse"
description: "This is an error"
content:
application/json:
schema:
type: string
```
##### Serverless Request Schema Validators
As of 0.0.64, you can now make use of [Request Schema Validators](https://www.serverless.com/framework/docs/providers/aws/events/apigateway#request-schema-validators). This allows you to define Request models via the `apiGateway` settings:
```yml
provider:
...
apiGateway:
request:
schemas:
post-create-model:
name: PostCreateModel
schema: ${file(api_schema/post_add_schema.json)}
description: "A Model validation for adding posts"
```
which are then used like:
```yml
functions:
create:
handler: posts.create
events:
- http:
path: posts/create
method: post
request:
schemas:
application/json: post-create-model
documentation: ...
```
The generator will match to the model within the `apiGateway` settings model list. If you are using the `apiGateway` to define models, please do not re-use any names that you might define in the [`models`](#models) list.
You can also skip writing a `requestBody` and `requestModels` if you have defined a `request` property in your event.
If you're not using `apiGateway`, you can still make use of `request` by writing in the other styles that serverless accepts for Request Schema Validators:
```yml
functions:
create:
handler: posts.create
events:
- http:
path: posts/create
method: post
request:
schemas:
application/json:
schema: ${file(create_request.json)}
name: PostCreateModel
description: "Validation model for Creating Posts"
```
or
```yml
functions:
create:
handler: posts.create
events:
- http:
path: posts/create
method: post
request:
schemas:
application/json: ${file(create_request.json)}
```
#### Functions
To define the documentation for a given function event, you need to create a `documentation` attribute for your `http` or `httpApi` event in your `serverless.yml` file.
The `documentation` section of the event configuration can contain the following attributes:
- `summary`: A short description of the method
- `description`: A detailed description of the method
- `tags`: An array of tags for this event
- `deprecated`: Boolean indicator that indicates clients should migrate away from this function
- `requestBody`: Contains description of the request
- `description`: A description of the request body
- `required`: Whether the request body is required, defaults to false
- `requestModels`: A list of models to describe the request bodies (see [requestModels](#requestmodels) below)
- `queryParams`: A list of query parameters (see [queryParams](#queryparams) below)
- `pathParams`: A list of path parameters (see [pathParams](#pathparams) below)
- `cookieParams`: A list of cookie parameters (see [cookieParams](#cookieparams) below)
- `headerParams`: A list of headers (see [headerParams](#headerparams---request-headers) below)
- `security`: The security requirement to apply (see [security](#security) below)
- `methodResponses`: An array of response models and applicable status codes
- `statusCode`: Applicable http status code (ie. 200/404/500 etc.)
- `responseBody`: Contains description of the response
- `description`: A description of the body response
- `responseHeaders`: A list of response headers (see [responseHeaders](#responseheaders) below)
- `responseModels`: A list of models to describe the request bodies (see [responseModels](#responsemodels) below) for each `Content-Type`
If you don't want a `http` or `httpApi` event to be documented, you can leave off the `documentation` object. The configuration schema will only check that you have specified a `methodResponses` on the `documentation` event, previously the plugin would cause serverless to warn or error (depending on your `configValidationMode`) if you had not supplied a `documentation` on an event.
```yml
functions:
createUser:
handler: handler.create
events:
- http:
path: create
method: post
cors: true
summary:
documentation:
summary: "Create User"
description: "Creates a user and then sends a generated password email"
tags:
- tag1
externalDocumentation:
url: https://bing.com
description: A link to bing
requestBody:
description: "A user information object"
requestModels:
application/json: "PutDocumentRequest"
pathParams:
- name: "username"
description: "The username for a user to create"
schema:
type: "string"
pattern: "^[-a-z0-9_]+$"
queryParams:
- name: "membershipType"
description: "The user's Membership Type"
schema:
type: "string"
enum:
- "premium"
- "standard"
cookieParams:
- name: "SessionId"
description: "A Session ID variable"
schema:
type: "string"
headerParams:
name: "Content-Type"
description: "The content type"
schema:
type: "string"
methodResponses:
- statusCode: 201
responseBody:
description: "A user object along with generated API Keys"
responseModels:
application/json: "PutDocumentResponse"
responseHeaders:
X-Rate-Limit-Limit:
description: The number of allowed requests in the current period
schema:
type: integer
- statusCode: 500
responseBody:
description: "An error message when creating a new user"
responseModels:
application/json: "ErrorResponse"
```
#### `queryParams`
Query parameters can be described as follow:
- `name`: the name of the query variable
- `description`: a description of the query variable
- `required`: whether the query parameter is mandatory (boolean)
- `schema`: JSON schema (inline, file or externally hosted)
```yml
queryParams:
- name: "filter"
description: "The filter parameter"
required: true
schema:
type: "string"
```
#### `pathParams`
Path parameters can be described as follow:
- `name`: the name of the path parameter
- `description`: a description of the path parameter
- `schema`: JSON schema (inline, file or externally hosted)
```yml
pathParams:
- name: "usernameId"
description: "The usernameId parameter"
schema:
type: "string"
```
#### `cookieParams`
Cookie parameters can be described as follow:
- `name`: the name of the cookie parameter
- `description`: a description of the cookie parameter
- `required`: whether the cookie parameter is mandatory (boolean)
- `schema`: JSON schema (inline, file or externally hosted)
```yml
cookieParams:
- name: "sessionId"
description: "The sessionId parameter"
required: true
schema:
type: "string"
```
#### `headerParams` - Request Headers
Request Headers can be described as follow:
- `name`: the name of the header
- `description`: a description of the header
- `required`: whether the header is mandatory (boolean)
- `schema`: JSON schema (inline, file or externally hosted)
```yml
headerParams:
- name: "Content-Type"
description: "The content type"
required: true
schema:
type: "string"
```
#### `security`
The `security` property allows you to specify the [Security Scheme](#securityschemes) to apply to the HTTP Request. If you have applied an `security` ([see Security on each operation](#security-on-each-operation)) then you can either leave this field off, or to override it with a different scheme you can write it like:
```yml
custom:
documentation:
securitySchemes:
my_api_key:
type: apiKey
name: api_key
in: header
petstore_auth:
type: oauth2
flows:
implicit:
authorizationUrl: https://example.com/api/oauth/dialog
scopes:
write:pets: modify pets in your account
read:pets: read your pets
security:
- my_api_key: []
functions:
getData:
events:
- http:
documentation:
security:
- petstore_auth:
- write:pets
- read:pets
```
If you have specified an `security` at the document root, but this HTTP Request should not apply any security schemes, you should set security to be an array with an empty object:
```yml
custom:
documentation:
securitySchemes:
my_api_key:
type: apiKey
name: api_key
in: header
security:
- my_api_key: []
functions:
getData:
events:
- http:
documentation:
security:
- {}
```
##### private
If you use the [private](https://www.serverless.com/framework/docs/providers/aws/events/apigateway#setting-api-keys-for-your-rest-api) property on your event:
```yml
functions:
getData:
events:
- http:
path: /
method: get
private: true
```
It will automatically setup an apiKey security scheme of `x-api-key` attached to that method. You don't need to add this to the [Security Scheme](#securityschemes) in the main documentation. If you have already added a Security Scheme of an `apiKey` with a name of `x-api-key`, it will associate with that key.
```yml
custom:
documentation:
securitySchemes:
my_api_key:
type: apiKey
name: x-api-key
in: header
security:
- my_api_key: []
functions:
getData:
events:
- http:
path: /
method: get
private: true
documentation: ...
```
Will set the Security Scheme to `my_api_key` for that operation.
#### `requestModels`
The `requestModels` property allows you to define models for the HTTP Request of the function event. You can define a different model for each different `Content-Type`. You can define a reference to the relevant request model named in the `models` section of your configuration (see [Defining Models](#models) section).
```yml
requestModels:
application/json: "CreateRequest"
application/xml: "CreateRequestXML"
```
#### `methodResponses`
`methodResponses` is a mandatory property and should include the `responseBody` and `description` properties.
You can define the response schemas by defining properties for your function event.
For an example of a `methodResponses` configuration for an event see below:
```yml
methodResponse:
- statusCode: 200
responseBody:
description: Success
responseModels:
application/json: "CreateResponse"
application/xml: "CreateResponseXML"
links:
getDataLink:
operation: getData
description: The id created here can be used to get Data
parameters:
contentId: $response.body#/id
responseHeaders:
X-Rate-Limit-Limit:
description: The number of allowed requests in the current period
schema:
type: integer
X-Rate-Limit-Remaining:
description: The number of remaining requests in the current period
schema:
type: integer
X-Rate-Limit-Reset:
description: The number of seconds left in the current period
schema:
type: integer
```
##### `responseModels`
The `responseModels` property allows you to define models for the HTTP Response of the function event. You can define a different model for each different `Content-Type`. You can define a reference to the relevant response model named in the `models` section of your configuration (see [Defining Models](#models) section).
```yml
responseModels:
application/json: "CreateResponse"
application/xml: "CreateResponseXML"
```
##### `links`
The `links` property allows you to define how operations are linked to each other:
```yml
links:
linkName:
operation: getContent
description: The contentId created here can be used to get content
parameters:
contentId: $response.body#/contentId
```
Where we are specifying operation, this should map to the function name:
```yml
functions:
createContent:
events:
- httpApi:
path: /
method: POST
documentation: ...
getContent:
events:
- http:
path: /{contentId}
method: POST
documentation: ...
```
If our example link was attached to the **createContent** function, and we wanted the `contentId` that was created to be used on the **getContent** function in the `contentId` parameter, we'd specify the `operation` property as **getContent**. If however, you had specified an operationId in the documentation to override the automatically created one:
```yml
getContent:
events:
- http:
path: /{contentId}
method: POST
documentation:
operationId: getMyContent
```
You can refer to the `operationId` that you created.
You can read more about [links](https://swagger.io/docs/specification/links/) on the swagger.io site and in the [OpenAPI](https://spec.openapis.org/oas/v3.0.3#link-object) specification. They don't seem widely supported just yet, but perhaps they'll improve your documentation.
##### `responseHeaders`
The `responseHeaders` property allows you to define the headers expected in a HTTP Response of the function event. This should only contain a description and a schema, which must be a JSON schema (inline, file or externally hosted).
```yml
responseHeaders:
X-Rate-Limit-Limit:
description: The number of allowed requests in the current period
schema:
type: integer
```
###### CORS
You can automatically generate CORS response headers by setting `cors` at the function level. Serverless allows you to modify how CORS is setup, so you can have the default options with `cors: true`, or you can modify the settings as shown in the [serverless documentation for CORS](https://www.serverless.com/framework/docs/providers/aws/events/apigateway#enabling-cors).
The generator will interpret your settings for CORS and automatically add the response headers. If for whatever reason you wish to override these, you can set them via the above `responseHeaders` setting and it'll apply your overrides.
##### OWASP
You can make use of the [OWASP Secure Headers](https://owasp.org/www-project-secure-headers/#x-permitted-cross-domain-policies) to generate response headers. These are a selection of response headers with default values that OWASP recommends returning with your response to help secure your application.
The OWASP Secure Headers Project contains a set of recommended headers to return with recommended values, when generating the documentation, the generator will attempt to get the latest version of this document and apply the latest recommendations. If you do not allow outside connections, it will default to a version of recommendations from **2023-05-26 12:22:30 UTC**.
Like CORS, if you have already set any of the OWASP Secure headers via `responseHeaders`, it will not overwrite them.
To make use of OWASP Secure Headers, you can use the following:
###### All OWASP Secure Headers
```yml
methodResponse:
- statusCode: 200
responseBody:
description: Success
responseModels:
application/json: "CreateResponse"
owasp: true
```
This will use the full set of OWASP Secure Headers and their recommended values. Some of these might not be appropriate for your application.
###### Subset of OWASP Secure Headers
```yml
methodResponse:
- statusCode: 200
responseBody:
description: Success
responseModels:
application/json: "CreateResponse"
owasp:
cacheControl: true
referrerPolicy: true
```
This will set only the `cacheControl` and `referrerPolicy` response header with the default recommendations.
The full list of OWASP Secure Headers you can set are:
- cacheControl - Cache-Control,
- clearSiteData - Clear-Site-Data,
- contentSecurityPolicy - Content-Security-Policy,
- crossOriginEmbedderPolicy - Cross-Origin-Embedder-Policy,
- crossOriginOpenerPolicy - Cross-Origin-Opener-Policy,
- crossOriginResourcePolicy - Cross-Origin-Resource-Policy,
- permissionsPolicy - Permissions-Policy,
- pragma - Pragma,
- referrerPolicy - Referrer-Policy,
- strictTransportSecurity - Strict-Transport-Security,
- xContentTypeOptions - X-Content-Type-Options,
- xFrameOptions - X-Frame-Options,
- xPermittedCrossDomainPolicies - X-Permitted-Cross-Domain-Policies
###### Subset of OWASP Secure Headers with user defined values
If you wish to override the OWASP Secure Headers, you can write your `methodResponse` like:
```yml
methodResponse:
- statusCode: 200
responseBody:
description: Success
responseModels:
application/json: "CreateResponse"
owasp:
cacheControl:
value: no-store
```
This will set the `Cache-Control` Response Header to have a value of "no-store" rather than any value the OWASP Secure Headers Project recommends.
## Validator
Validation for the OpenAPI Description is now (as of 0.0.90) done by [Redocly](https://redocly.com/). This is a slightly less opinionated validator for an OpenAPI Description, it should result in less errors around "YAML Anchors". It's also a maintained library, and has support for OpenAPI 3.1.0 which I hope to be able to support very soon.
I am making use of https://www.npmjs.com/package/@redocly/openapi-core, which I have been warned is likely to change. If you notice anything going wrong with validation of your OpenAPI Description, feel free to open an issue here. I make active use of this library, so will hopefully come across those issues too.
### Rules
I have configured the validator to use these Rules:
- [spec](https://redocly.com/docs/cli/rules/spec/)
- [path-parameters-defined](https://redocly.com/docs/cli/rules/path-parameters-defined/)
- [operation-2xx-response](https://redocly.com/docs/cli/rules/operation-2xx-response/)
- [operation-4xx-response](https://redocly.com/docs/cli/rules/operation-4xx-response/)
- [operation-operationId-unique](https://redocly.com/docs/cli/rules/operation-operationid-unique/)
- [path-declaration-must-exist](https://redocly.com/docs/cli/rules/path-declaration-must-exist/)
However, you can configure your own rules from the [ruleset available on the Redocly site](https://redocly.com/docs/cli/rules/built-in-rules/). To do this, you will need to create a `redocly.json` file within an `options` folder. The file should look like:
```json
{
"spec": "error",
"path-parameters-defined": "error",
"operation-2xx-response": "error",
"operation-4xx-response": "error",
"operation-operationId-unique": "error",
"path-declaration-must-exist": "error"
}
```
Since rules can be set to "warn", you no longer are required to tell the plugin to ignore errors with the `--validationWarn` flag.
## Example configuration
Please view the example [serverless.yml](test/serverless-tests/best/serverless.yml).
## Notes on schemas
Schemas can be either: inline, in file or externally hosted. If they're inline or in file, the plugin will attempt to normalise the schema to [OpenAPI 3.0.X specification](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.0.md#schemaObject).
If they exist as an external reference, for instance:
```yaml
schema: https://raw.githubusercontent.com/SchemaStore/schemastore/master/src/schemas/json/bettercodehub.json
```
We use the plugin [JSON Schema $Ref Parser](https://apitools.dev/json-schema-ref-parser/) to attempt to parse and resolve the references. There are limitations to this. Consider the schema:
```json
{
"$schema": "https://json-schema.org/draft-04/schema",
"title": "Reusable Definitions",
"type": "object",
"id": "https://raw.githubusercontent.com/json-editor/json-editor/master/tests/fixtures/definitions.json",
"definitions": {
"address": {
"title": "Address",
"type": "object",
"properties": {
"street_address": { "type": "string" },
"city": { "type": "string" },
"state": { "type": "string" }
},
"required": ["street_address"]
},
"link": { "$refs": "./properties.json#/properties/title" }
},
"properties": {
"address": { "$refs": "#/definitions/address" }
}
}
```
Where the definition "link" refers to a schema held in a directory that the resolver does not know about, we will not be able to fully resolve the schema which will likely cause errors in validation of the OpenAPI 3.0.X Description.
Because of the dependency we use to parse externally linked schemas, we can supply our own options to resolve schemas that are more difficult than a straight forward example.
You can create your own options file: https://apitools.dev/json-schema-ref-parser/docs/options.html to pass into the dependency that contains it's own resolver to allow you to resolve references that might be in hard to reach places. In your main project folder, you should have a folder called `options` with a file called `ref-parser.js` that looks like:
```js
"use strict";
// options from: https://apitools.dev/json-schema-ref-parser/docs/options.html
module.exports = {
continueOnError: true, // Don't throw on the first error
parse: {
json: false, // Disable the JSON parser
yaml: {
allowEmpty: false, // Don't allow empty YAML files
},
text: {
canParse: [".txt", ".html"], // Parse .txt and .html files as plain text (strings)
encoding: "utf16", // Use UTF-16 encoding
},
},
resolve: {
file: false, // Don't resolve local file references
http: {
timeout: 2000, // 2 second timeout
withCredentials: true, // Include auth credentials when resolving HTTP references
},
},
dereference: {
circular: false, // Don't allow circular $refs
excludedPathMatcher: (
path // Skip dereferencing content under any 'example' key
) => path.includes("/example/"),
},
};
```
If you don't supply this file, it will use the default options.
## License
MIT