Table of Contents

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Need to be discussed: Should ONAP adopt a version discovery mechanism like OpenStack?  :https://wiki.openstack.org/wiki/VersionDiscovery

URI Construction

RESTful APIs use Uniform Resource Identifiers (URIs) to address resources, ONAP projects should comply with a unified URI standard to implement the microservices.

• URI structure
  URI structure http://[host]:[port]/api/{service name}]/v{version number}/{resource}
  The URI is comprised of a fixed base uri /api/{service name}]/v{version number} and the resource path. Only major version number is used in the URI. An example: http://127.0.0.1:8080/api/petstore/v1/pets/dogs

• CRUD function names should not be used in URIs. Instead, CRUD actions should be represented by HTTP methods. Below is the proposed methodology to implement CRUD operations in a RESTful API.

  Resource	POST	GET	PUT	DELETE
  /api/petstore/v1/pets/dogs	Create a new dog	List dogs	Replace dogs with new dogs(Bulk update)	Delete all dogs
  /api/petstore/v1/pets/dogs/bailey	Error	Show dog	If exist update dog else ERROR	Delete dog

  Do not use:

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A forward slash (/) adds no semantic value and may cause confusion. RESTful API’s should not expect a trailing slash and should not include them in the links that they provide to clients.

• Forward slash separator (/) must be used to indicate a hierarchical relationship
• Use Hyphens (-) instead of Underscores (_)  if separation of words is needed in the URI

 Underscores (_) can be hidden by the underline of URIs in browsers.

• Lowercase letters should be preferred in URI paths

When convenient, lowercase letters are preferred in URI paths since capital letters can sometimes cause problems. RFC 3986 defines URIs as case-sensitive except for the scheme and host components.

• File extensions should not be included in URIs

A REST API should not include artificial file extensions in URIs to indicate the format of a message’s entity body. Instead, they should rely on the media type, as communicated through the Content-Type header, to determine how to process the body’s content. 

• A plural noun should be used for collection names
  For example, the URI for a collection of dog documents uses the plural noun form of its contained resources: /api/petstore/v1/pets/dogs
• A singular noun should be used for document names
  For example, the URI for a single dog document would have the singular form: /api/petstore/v1/pets/dogs/bailey

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Multiple tenants support

TBD

Appendix

Maven plugin to generate Swagger documents https://github.com/WASdev/tool.swagger.docgen

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