Class: Grape::Endpoint

Inherits:
Object
  • Object
show all
Defined in:
lib/grape/endpoint.rb

Overview

An Endpoint is the proxy scope in which all routing blocks are executed. In other words, any methods on the instance level of this class may be called from inside a get, post, etc.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(settings, options = {}, &block) ⇒ Endpoint

Returns a new instance of Endpoint.

Raises:

  • (ArgumentError) 


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# File 'lib/grape/endpoint.rb', line 39

def initialize(settings, options = {}, &block)
  @settings = settings
  if block_given?
    method_name = "#{options[:method]} #{settings.gather(:namespace).join( "/")} #{Array(options[:path]).join("/")}"
    @source = block
    @block = self.class.generate_api_method(method_name, &block)
  end
  @options = options

  raise ArgumentError, "Must specify :path option." unless options.key?(:path)
  options[:path] = Array(options[:path])
  options[:path] = ['/'] if options[:path].empty?

  raise ArgumentError, "Must specify :method option." unless options.key?(:method)
  options[:method] = Array(options[:method])

  options[:route_options] ||= {}
end

Instance Attribute Details

#block ⇒ Object

Returns the value of attribute block.



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# File 'lib/grape/endpoint.rb', line 11

def block
  @block
end

#env ⇒ Object (readonly)

Returns the value of attribute env.



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# File 'lib/grape/endpoint.rb', line 12

def env
  @env
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/grape/endpoint.rb', line 11

def options
  @options
end

#request ⇒ Object (readonly)

Returns the value of attribute request.



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# File 'lib/grape/endpoint.rb', line 12

def request
  @request
end

#settings ⇒ Object

Returns the value of attribute settings.



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# File 'lib/grape/endpoint.rb', line 11

def settings
  @settings
end

#source ⇒ Object

Returns the value of attribute source.



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# File 'lib/grape/endpoint.rb', line 11

def source
  @source
end

Class Method Details

.generate_api_method(method_name, &block) ⇒ Proc

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Create an UnboundMethod that is appropriate for executing an endpoint route.

The unbound method allows explicit calls to +return+ without raising a +LocalJumpError+. The method will be removed, but a +Proc+ reference to it will be returned. The returned +Proc+ expects a single argument: the instance of +Endpoint+ to bind to the method during the call.

Parameters:

  • method_name (String, Symbol)

Returns:

  • (Proc)

Raises:

  • (NameError) —

    an instance method with the same name already exists



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# File 'lib/grape/endpoint.rb', line 28

def generate_api_method(method_name, &block)
  if instance_methods.include?(method_name.to_sym) || instance_methods.include?(method_name.to_s)
    raise NameError.new("method #{method_name.inspect} already exists and cannot be used as an unbound method name")
  end
  define_method(method_name, &block)
  method = instance_method(method_name)
  remove_method(method_name)
  proc { |endpoint_instance| method.bind(endpoint_instance).call }
end

Instance Method Details

#body(value = nil) ⇒ Object

Allows you to define the response body as something other than the return value.

Examples:

get '/body' do
  body "Body"
  "Not the Body"
end

GET /body # => "Body"


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# File 'lib/grape/endpoint.rb', line 291

def body(value = nil)
  if value
    @body = value
  else
    @body
  end
end

#body_params ⇒ Object

Pull out request body params if the content type matches and we're on a POST or PUT



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# File 'lib/grape/endpoint.rb', line 189

def body_params
  if ['POST', 'PUT'].include?(request.request_method.to_s.upcase) && request.content_length.to_i > 0
    return @body_params ||=
      case env['CONTENT_TYPE']
      when 'application/json'
        MultiJson.load(request.body.read)
      when 'application/xml'
        MultiXml.parse(request.body.read)
      else
        {}
      end
  end

  {}
end

#call(env) ⇒ Object 



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# File 'lib/grape/endpoint.rb', line 142

def call(env)
  dup.call!(env)
end

#call!(env) ⇒ Object 



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# File 'lib/grape/endpoint.rb', line 146

def call!(env)
  env['api.endpoint'] = self
  if options[:app]
    options[:app].call(env)
  else
    builder = build_middleware
    builder.run options[:app] || lambda{|env| self.run(env) }
    builder.call(env)
  end
end

#compile_path(prepared_path, anchor = true, requirements = {}) ⇒ Object 



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# File 'lib/grape/endpoint.rb', line 135

def compile_path(prepared_path, anchor = true, requirements = {})
  endpoint_options = {}
  endpoint_options[:version] = /#{settings[:version].join('|')}/ if settings[:version]
  endpoint_options.merge!(requirements)
  Rack::Mount::Strexp.compile(prepared_path, endpoint_options, %w( / . ? ), anchor)
end

#content_type(val) ⇒ Object

Set response content-type



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# File 'lib/grape/endpoint.rb', line 265

def content_type(val)
  header('Content-Type', val)
end

#cookies ⇒ Object

Set or get a cookie

Examples:

cookies[:mycookie] = 'mycookie val'
cookies['mycookie-string'] = 'mycookie string val'
cookies[:more] = { :value => '123', :expires => Time.at(0) }
cookies.delete :more


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# File 'lib/grape/endpoint.rb', line 277

def cookies
  @cookies ||= Cookies.new
end

#declared(params, options = {}) ⇒ Object

A filtering method that will return a hash consisting only of keys that have been declared by a params statement.

Parameters:

  • params (Hash) —

    The initial hash to filter. Usually this will just be params

  • options (Hash) (defaults to: {}) —

    Can pass :include_missing and :stringify options.



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# File 'lib/grape/endpoint.rb', line 172

def declared(params, options = {})
  options[:include_missing] = true unless options.key?(:include_missing)

  unless settings[:declared_params]
    raise ArgumentError, "Tried to filter for declared parameters but none exist."
  end

  settings[:declared_params].inject({}){|h,k|
    output_key = options[:stringify] ? k.to_s : k.to_sym
    if params.key?(output_key) || options[:include_missing]
      h[output_key] = params[k]
    end
    h
  }
end

#error!(message, status = 403) ⇒ Object

End the request and display an error to the end user with the specified message.

Parameters:

  • message (String) —

    The message to display.

  • status (Integer) (defaults to: 403) —

    the HTTP Status Code. Defaults to 403.



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# File 'lib/grape/endpoint.rb', line 213

def error!(message, status=403)
  throw :error, :message => message, :status => status
end

#header(key = nil, val = nil) ⇒ Object

Set an individual header or retrieve all headers that have been set.



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# File 'lib/grape/endpoint.rb', line 256

def header(key = nil, val = nil)
  if key
    val ? @header[key.to_s] = val : @header.delete(key.to_s)
  else
    @header
  end
end

#mount_in(route_set) ⇒ Object 



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# File 'lib/grape/endpoint.rb', line 62

def mount_in(route_set)
  if endpoints
    endpoints.each{|e| e.mount_in(route_set)}
  else
    routes.each do |route|
      route_set.add_route(self, {
        :path_info => route.route_compiled,
        :request_method => route.route_method,
      }, { :route_info => route })
    end
  end
end

#namespace ⇒ Object 



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# File 'lib/grape/endpoint.rb', line 131

def namespace
  Rack::Mount::Utils.normalize_path(settings.stack.map{|s| s[:namespace]}.join('/'))
end

#params ⇒ Object

The parameters passed into the request as well as parsed from URL segments.



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# File 'lib/grape/endpoint.rb', line 159

def params
  @params ||= Hashie::Mash.new.
    deep_merge(request.params).
    deep_merge(env['rack.routing_args'] || {}).
    deep_merge(self.body_params)
end

#prepare_path(path) ⇒ Object 



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# File 'lib/grape/endpoint.rb', line 111

def prepare_path(path)
  parts = []
  parts << settings[:root_prefix].to_s.split("/") if settings[:root_prefix]

  uses_path_versioning = settings[:version] && settings[:version_options][:using] == :path
  namespace_is_empty = namespace && (namespace.to_s =~ /^\s*$/ || namespace.to_s == '/')
  path_is_empty = path && (path.to_s =~ /^\s*$/ || path.to_s == '/')

  parts << ':version' if uses_path_versioning
  if !uses_path_versioning || (!namespace_is_empty || !path_is_empty)
    parts << namespace.to_s if namespace
    parts << path.to_s if path
    format_suffix = '(.:format)'
  else
    format_suffix = '(/.:format)'
  end
  parts = parts.flatten.select { |part| part != '/' }
  Rack::Mount::Utils.normalize_path(parts.join('/') + format_suffix)
end

#prepare_routes ⇒ Object 



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# File 'lib/grape/endpoint.rb', line 75

def prepare_routes
  routes = []
  options[:method].each do |method|
    options[:path].each do |path|
      prepared_path = prepare_path(path)

      anchor = options[:route_options][:anchor]
      anchor = anchor.nil? ? true : anchor

      requirements = options[:route_options][:requirements] || {}

      path = compile_path(prepared_path, anchor && !options[:app], requirements)
      regex = Rack::Mount::RegexpWithNamedGroups.new(path)
      path_params = {}
      # named parameters in the api path
      named_params = regex.named_captures.map { |nc| nc[0] } - [ 'version', 'format' ]
      named_params.each { |named_param| path_params[named_param] = "" }
      # route parameters declared via desc or appended to the api declaration
      route_params = (options[:route_options][:params] || {})
      path_params.merge!(route_params)
      request_method = (method.to_s.upcase unless method == :any)
      routes << Route.new(options[:route_options].clone.merge({
        :prefix => settings[:root_prefix],
        :version => settings[:version] ? settings[:version].join('|') : nil,
        :namespace => namespace,
        :method => request_method,
        :path => prepared_path,
        :params => path_params,
        :compiled => path,
        })
      )
    end
  end
  routes
end

#present(object, options = {}) ⇒ Object

Allows you to make use of Grape Entities by setting the response body to the serializable hash of the entity provided in the :with option. This has the added benefit of automatically passing along environment and version information to the serialization, making it very easy to do conditional exposures. See Entity docs for more info.

Examples:


get '/users/:id' do
  present User.find(params[:id]),
    :with => API::Entities::User,
    :admin => current_user.admin?
end


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# File 'lib/grape/endpoint.rb', line 314

def present(object, options = {})
  entity_class = options.delete(:with)

  object.class.ancestors.each do |potential|
    entity_class ||= (settings[:representations] || {})[potential]
  end

  entity_class ||= object.class.const_get(:Entity) if object.class.const_defined?(:Entity)

  root = options.delete(:root)

  representation = if entity_class
    embeds = {:env => env}
    embeds[:version] = env['api.version'] if env['api.version']
    entity_class.represent(object, embeds.merge(options))
  else
    object
  end

  representation = { root => representation } if root
  body representation
end

#redirect(url, options = {}) ⇒ Object

Redirect to a new url.

Parameters:

  • url (String) —

    The url to be redirect.

  • options (Hash) (defaults to: {}) —

    The options used when redirect. :permanent, default true.



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# File 'lib/grape/endpoint.rb', line 222

def redirect(url, options = {})
  merged_options = {:permanent => false }.merge(options)
  if merged_options[:permanent]
    status 301
  else
    if env['HTTP_VERSION'] == 'HTTP/1.1' && request.request_method.to_s.upcase != "GET"
      status 303
    else
      status 302
    end
  end
  header "Location", url
  body ""
end

#route ⇒ Object

Returns route information for the current request.

Examples:


desc "Returns the route description."
get '/' do
  route.route_description
end


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# File 'lib/grape/endpoint.rb', line 345

def route
  env["rack.routing_args"][:route_info]
end

#routes ⇒ Object 



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# File 'lib/grape/endpoint.rb', line 58

def routes
  @routes ||= endpoints ? endpoints.collect(&:routes).flatten : prepare_routes
end

#status(status = nil) ⇒ Object

Set or retrieve the HTTP status code.

Parameters:

  • status (Integer) (defaults to: nil) —

    The HTTP Status Code to return for this request.



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# File 'lib/grape/endpoint.rb', line 240

def status(status = nil)
  if status
    @status = status
  else
    return @status if @status
    case request.request_method.to_s.upcase
      when 'POST'
        201
      else
        200
    end
  end
end

#version ⇒ Object

The API version as specified in the URL.



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# File 'lib/grape/endpoint.rb', line 206

def version; env['api.version'] end