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 75

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 143

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

#base_uri(request) ⇒ Object 



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# File 'lib/toast/request_helpers.rb', line 11

def base_uri request
  Toast.base_uri
end

#call_allow(procs, *args) ⇒ Object 



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# File 'lib/toast/request_helpers.rb', line 105

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 120

def call_handler proc, *args
  result = nil

  begin
    context = Object.new
    context.define_singleton_method(:bad_request) do |message, options = {}|
      raise Toast::Errors::BadRequest.new message, caller.first.sub(/:in.*/,''), options[:code]
    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.try(: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.name == model_class.name
  end || raise(Toast::Errors::ConfigNotFound)
end

#is_active_record?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/toast/request_helpers.rb', line 139

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

#represent(one_or_many_records, config) ⇒ Object 



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# File 'lib/toast/request_helpers.rb', line 62

def represent one_or_many_records, config

  result = if one_or_many_records.respond_to?(:map)
             one_or_many_records.map do |record|
               represent_one(record, config)
             end
           else
             represent_one(one_or_many_records, config)
           end

  result.to_json
end

#represent_one(record, config) ⇒ Object 



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# File 'lib/toast/request_helpers.rb', line 20

def represent_one record, config
  result = {}

  model_uri = [@base_uri, config.prefix_path, record.class.name.underscore.pluralize].delete_if(&:blank?).join('/')

  # can we inject model_uri  into the recortd, so that virtual attribute methods can use it in their result?

  # - setting a special property on the record :-/, OK Toast could extend all exposed classes by a special accessor,
  #   maybe only if configured.
  # - calling somehow this method in different/extended context (how?)
  # - passing this as parameter, while not requiring all the attribute methods to accept a 2. arg (possible?)
  # - If the result is a String it can return a templated String like "{{ toast_uri }}", OK for single
  #   strings, but for mebedded Hashes with Strings no, too expensive.

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

  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 92

def response status_sym, headers: {}, msg: nil, body: nil
  Toast.logger.info "done: #{msg}"

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

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

#split_link_header(link) ⇒ Object

split the name and id of the resource from a LinkHeader



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# File 'lib/toast/request_helpers.rb', line 16

def split_link_header link
  URI(link.href).path.sub(@request.script_name,'').split('/')[1..-1]
end