Class: HalClient

Inherits:
Object
  • Object
show all
Extended by:
EntryPointCovenienceMethods
Defined in:
lib/hal_client.rb,
lib/hal_client/errors.rb,
lib/hal_client/version.rb,
lib/hal_client/collection.rb,
lib/hal_client/links_section.rb,
lib/hal_client/curie_resolver.rb,
lib/hal_client/representation.rb,
lib/hal_client/representation_set.rb,
lib/hal_client/representation_editor.rb

Overview

Adapter used to access resources.

Defined Under Namespace

Modules: EntryPointCovenienceMethods Classes: Collection, CurieResolver, HttpError, LinksSection, Representation, RepresentationEditor, RepresentationSet

Constant Summary collapse

InvalidRepresentationError =

The representation is not a valid HAL document.

Class.new(StandardError)
NotACollectionError =

The representation is not a HAL collection

Class.new(StandardError)
HttpClientError =

Server response with a 4xx status code

Class.new(HttpError)
HttpServerError =

Server responded with a 5xx status code

Class.new(HttpError)
VERSION = 
"3.9.0"

Instance Method Summary collapse

Methods included from EntryPointCovenienceMethods

post

Constructor Details

#initialize(options = {}) ⇒ HalClient

Initializes a new client instance

options - hash of configuration options

:accept - one or more content types that should be
  prepended to the `Accept` header field of each request.
:content_type - a single content type that should be
  prepended to the `Content-Type` header field of each request.
:authorization - a `#call`able which takes the url being
  requested and returns the authorization header value to use
  for the request or a string which will always be the value of
  the authorization header
:headers - a hash of other headers to send on each request.
:base_client - An HTTP::Client object to use.



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# File 'lib/hal_client.rb', line 33

def initialize(options={})
  @default_message_request_headers = HTTP::Headers.new
  @default_entity_request_headers = HTTP::Headers.new
  @auth_helper = as_callable(options.fetch(:authorization, NullAuthHelper))
  @base_client ||= options[:base_client]

  default_message_request_headers.set('Accept', options[:accept]) if
    options[:accept]
  # Explicit accept option has precedence over accepts in the
  # headers option.

  options.fetch(:headers, {}).each do |name, value|
    if entity_header_field? name
      default_entity_request_headers.add(name, value)
    else
      default_message_request_headers.add(name, value)
    end
  end

  default_entity_request_headers.set('Content-Type', options[:content_type]) if
    options[:content_type]
  # Explicit content_content options has precedence over content
  # type in the headers option.

  default_entity_request_headers.set('Content-Type', 'application/hal+json') unless
    default_entity_request_headers['Content-Type']
  # We always want a content type. If the user doesn't explicitly
  # specify one we provide a default.

  accept_values = Array(default_message_request_headers.get('Accept')) +
    ['application/hal+json;q=0']
  default_message_request_headers.set('Accept', accept_values.join(", "))
  # We can work with HAL so provide a back stop accept.
end

Instance Method Details

#get(url, headers = {}) ⇒ Object

Returns a Representation of the resource identified by url.

url - The URL of the resource of interest. headers - custom header fields to use for this request



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# File 'lib/hal_client.rb', line 72

def get(url, headers={})
  headers = auth_headers(url).merge(headers)
  interpret_response client_for_get(override_headers: headers).get(url)

rescue HttpError => e
  fail e.class.new("GET <#{url}> failed with code #{e.response.status}", e.response)
end