PyHalboy

A library for all things hypermedia. insipred by Halboy and Halboy.js

• Create hypermedia resources
• Marshal to and from plain python dicts
• Navigate JSON+HAL APIs

API

Resources

With PyHalboy you can create resources, and pull information from them.

from pyhalboy import Resource

discountResource = Resource()
    .add_link('self', '/discounts/1256')
    .add_property('discountPercentage', 10)

itemResources = [
   Resource()
    .add_link('self', '/items/534')
    .add_property('price', 25.48)
]

resource = Resource()
      .add_link('self', '/orders/123')
      .add_link('creator', '/users/rob')
      .add_resource('discount', discountResource)
      .add_resource('items', itemResources)
      .add_property('state', 'dispatching')

resource.get_link('self')
// { href: '/orders/123' }

resource.get_href('self')
// '/orders/123'

resource.get_property('state')
// 'dispatching'

resource
  .get_resource('creator')
  .get_property('discountPercentage')
// 10

resource
  .get_resource('items')[0]
  .get_property('price')
// 25.48

Marshalling

You can create HAL resources from plain JS objects, and vice versa.

from pyhalboy import Resource

itemResources = [
   Resource()
    .add_link('self', '/items/534')
    .add_property('price', 25.48)
]

resource =
    new Resource()
      .add_link('self', '/orders/123')
      .add_link('creator', '/users/rob')
      .add_resource('items', itemResources)
      .add_property('state', 'dispatching')

resource.to_object()
// {
//   _links: {
//     self: { href: '/orders/123' },
//     creator: { href: '/users/rob' }
//   },
//   _embedded: {
//     items: [{
//       _links: {
//         self: { href: '/items/534' }
//       },
//       price: 25.48
//     }]
//   },
//   state: 'dispatching'
// }

Resource.from_object(resource.to_object())
  .get_href('self')
// '/orders/123'

Navigation

Provided you're calling a HAL+JSON API, you can discover the API and navigate through its links. When you've found what you want, you call navigator.resource() and you get a plain old HAL resource, which you can inspect using any of the methods above.

from pyhalboy import Navigator

//  GET / - 200 OK
//  {
//   "_links": {
//     "self": {
//       "href": "/"
//     },
//     "users": {
//       "href": "/users"
//     },
//     "user": {
//       "href": "/users/{id}",
//       "templated": true
//     }
//   }
// }

discovery_result = Navigator.discover('https://api.example.com/')
users_result =  discovery_result.get('users')

users_result.status()
// 200

users_result.location()
// 'https://api.example.com/users'

robResult =  discovery_result.get('user', {id :'rob'})

robResult.location()
// 'https://api.example.com/users/rob'

sue_result =  discovery_result.post('user', {
  'id': 'sue',
  'name': 'Sue',
  'title': 'Dev'
})

sue_result.location()
// 'https://api.example.com/users/sue'

sue_result
  .resource()
  .get_property('title')
// 'Dev'

Contribution

Feel free to submit PRs and raise bugs.

Publishing

Prior to publishing the package, you need to configure your PyPi credentials on your local machine. Follow the instructions in the poetry docs to do this.

To publish the package:

poetry publish