Module: Toast::RequestHelpers

Included in:
CanonicalRequest, CollectionRequest, PluralAssocRequest, RackApp, SingleRequest, SingularAssocRequest
Defined in:
lib/toast/request_helpers.rb

Instance Method Summary collapse

Instance Method Details

#allowed_methods(config) ⇒ Object 



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# File 'lib/toast/request_helpers.rb', line 63

def allowed_methods(config)
  ["DELETE", "GET", "LINK", "PATCH", "POST", "UNLINK"].select{|m|
    !config.send("via_#{m.downcase}").nil?
  }.join(", ")
end

#attr_selected?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/toast/request_helpers.rb', line 131

def attr_selected? name
  (@selected_attributes.nil? or @selected_attributes.include?(name.to_s))
end

#base_uri(request) ⇒ Object

this is hard when behind a proxy relies on HTTP_X_FORWARDED* headers



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# File 'lib/toast/request_helpers.rb', line 13

def base_uri request
  port  = ":#{request.port}" unless request.port.in?([80,443])
  path  = request.path.sub(request.path_parameters[:toast_path]+'/','')
  (request.protocol + request.host + port.to_s + path).chomp('/')
end

#call_allow(procs, *args) ⇒ Object 



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# File 'lib/toast/request_helpers.rb', line 93

def call_allow procs, *args
  procs.each do |proc|
    # call all procs, break if proc returns false and raise
    begin
      result = Object.new.instance_exec *args, &proc
    rescue => error
      raise Toast::Errors::AllowError.new(error, proc.source_location.join(':'))
    end

    if result == false
      raise Toast::Errors::NotAllowed.new(proc.source_location.join(':'))
    end
  end
end

#call_handler(proc, *args) ⇒ Object 



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# File 'lib/toast/request_helpers.rb', line 108

def call_handler proc, *args
  result = nil

  begin
    context = Object.new
    context.define_singleton_method(:bad_request) do |message|
      raise Toast::Errors::BadRequest.new message, caller.first.sub(/:in.*/,'')
    end

    result = context.instance_exec *args, &proc

  rescue Toast::Errors::BadRequest
    raise # re-raise
  rescue => error
    raise Toast::Errors::HandlerError.new(error, error.backtrace.first.sub(/:in.*/,''))
  end
  result
end

#get_config(model_class) ⇒ Object 



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# File 'lib/toast/request_helpers.rb', line 5

def get_config model_class
  Toast.expositions.detect do |exp|
    exp.model_class == model_class
  end || raise(Toast::Errors::ConfigNotFound)
end

#is_active_record?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/toast/request_helpers.rb', line 127

def is_active_record? klass
  klass.include? ActiveRecord::Core
end

#represent(record_or_enum, config) ⇒ Object 



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# File 'lib/toast/request_helpers.rb', line 51

def represent record_or_enum, config
  result = if record_or_enum.is_a? Enumerable
             record_or_enum.map do |record|
               represent_one(record, config)
             end
           else
             represent_one(record_or_enum, config)
           end

  result.to_json
end

#represent_one(record, config) ⇒ Object 



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# File 'lib/toast/request_helpers.rb', line 19

def represent_one record, config
  result = {}

  (config.readables + config.writables).each do |attr|
    result[attr.to_s] = record.send(attr) if attr_selected?(attr)
  end

  model_uri =  "#{@base_uri}/#{record.class.name.underscore.pluralize}"    
  result['self'] = "#{model_uri}/#{record.id}" if attr_selected?('self')

  # add associations, collections and singles
  config.associations.each do |name, config|
    result[name.to_s] = "#{model_uri}/#{record.id}/#{name}" if attr_selected?(name)
  end

  config.singles.each do |name, config|
    result[name.to_s] = "#{model_uri}/#{name}" if attr_selected?(name)
  end

  config.collections.each do |name, config|
    if attr_selected?(name)
      result[name.to_s] = if name == :all
                       "#{model_uri}"
                     else
                       "#{model_uri}/#{name}"
                     end
    end
  end

  result
end

#response(status_sym, headers: {}, msg: nil, body: nil) ⇒ Object

Builds a Rack conform response tripel. Should be called at the end of the request processing.

Params:

  • status_sym [Symbol] A status code name like :ok, :unauthorized, etc.

  • headers: [Hash] HTTP headers, defaults to empty Hash

  • msg: [String] A Message for Toast log file, will be included in the body,

    if body is no set and app is in non-production modes

  • body: [String] The repsosne body text, default to nil

Return: Rack conform response



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# File 'lib/toast/request_helpers.rb', line 80

def response status_sym, headers: {}, msg: nil, body: nil
  Toast.logger.info "[#{Thread.current.object_id}] done:  #{msg}"

  unless Rails.env == 'production'
    # put message in body, too, if body is free
    body ||= msg
  end

  [ Rack::Utils::SYMBOL_TO_STATUS_CODE[status_sym],
    headers,
    [body] ]
end