Class: HaveAPI::Action

Inherits:
Common
  • Object
show all
Includes:
Hookable
Defined in:
lib/haveapi/action.rb

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Hookable

included

Methods inherited from Common

check_build, has_attr, inherit_attrs

Constructor Details

#initialize(request, version, params, body, context) ⇒ Action

Returns a new instance of Action.



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# File 'lib/haveapi/action.rb', line 258

def initialize(request, version, params, body, context)
  @request = request
  @version = version
  @params = params
  @params.update(body) if body
  @context = context
  @context.action = self.class
  @context.action_instance = self
  @metadata = {}
  @reply_meta = {object: {}, global: {}}
  @flags = {}

  class_auth = self.class.authorization

  if class_auth
    @authorization = class_auth.clone
  else
    @authorization = Authorization.new {}
  end
end

Class Attribute Details

.authorization ⇒ Object (readonly)

Returns the value of attribute authorization.



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# File 'lib/haveapi/action.rb', line 34

def authorization
  @authorization
end

.examples ⇒ Object (readonly)

Returns the value of attribute examples.



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# File 'lib/haveapi/action.rb', line 34

def examples
  @examples
end

.resource ⇒ Object (readonly)

Returns the value of attribute resource.



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# File 'lib/haveapi/action.rb', line 34

def resource
  @resource
end

Instance Attribute Details

#errors ⇒ Object (readonly)

Returns the value of attribute errors.



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# File 'lib/haveapi/action.rb', line 30

def errors
  @errors
end

#flags ⇒ Object

Returns the value of attribute flags.



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# File 'lib/haveapi/action.rb', line 31

def flags
  @flags
end

#message ⇒ Object (readonly)

Returns the value of attribute message.



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# File 'lib/haveapi/action.rb', line 30

def message
  @message
end

#version ⇒ Object (readonly)

Returns the value of attribute version.



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# File 'lib/haveapi/action.rb', line 30

def version
  @version
end

Class Method Details

.authorize(&block) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 169

def authorize(&block)
  @authorization = Authorization.new(&block)
end

.build_route(prefix) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 180

def build_route(prefix)
  route = @route || to_s.demodulize.underscore

  if !route.is_a?(String) && route.respond_to?(:call)
    route = route.call(self.resource)
  end

  prefix + route % {resource: self.resource.to_s.demodulize.underscore}
end

.delayed_inherited(subclass) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 47

def delayed_inherited(subclass)
  resource = Kernel.const_get(subclass.to_s.deconstantize)

  inherit_attrs(subclass)
  inherit_attrs_from_resource(subclass, resource, [:auth])

  i = @input.clone
  i.action = subclass

  o = @output.clone
  o.action = subclass

  m = {}

  @meta.each do |k,v|
    m[k] = v && v.clone
    next unless v
    m[k].action = subclass
  end

  subclass.instance_variable_set(:@input, i)
  subclass.instance_variable_set(:@output, o)
  subclass.instance_variable_set(:@meta, m)

  begin
    subclass.instance_variable_set(:@resource, resource)
    subclass.instance_variable_set(:@model, resource.model)
  rescue NoMethodError
    return
  end
end

.describe(context) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 190

def describe(context)
  authorization = (@authorization && @authorization.clone) || Authorization.new

  return false if (context.endpoint || context.current_user) && !authorization.authorized?(context.current_user)

  route_method = context.action.http_method.to_s.upcase
  context.authorization = authorization

  if context.endpoint
    context.action_instance = context.action.from_context(context)

    ret = catch(:return) do
      context.action_prepare = context.action_instance.prepare
    end

    return false if ret == false
  end

  {
      auth: @auth,
      description: @desc,
      aliases: @aliases,
      blocking: @blocking ? true : false,
      input: @input ? @input.describe(context) : {parameters: {}},
      output: @output ? @output.describe(context) : {parameters: {}},
      meta: @meta ? @meta.merge(@meta) { |_, v| v && v.describe(context) } : nil,
      examples: @examples ? @examples.describe(context) : [],
      url: context.resolved_url,
      method: route_method,
      help: "#{context.url}?method=#{route_method}"
  }
end

.example(title = '', &block) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 173

def example(title = '', &block)
  @examples ||= ExampleList.new
  e = Example.new(title)
  e.instance_eval(&block)
  @examples << e
end

.from_context(c) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 237

def from_context(c)
  ret = new(nil, c.version, c.params, nil, c)
  ret.instance_exec do
    @safe_params = @params.dup
    @authorization = c.authorization
    @current_user = c.current_user
  end

  ret
end

.inherit_attrs_from_resource(action, r, attrs) ⇒ Object

Inherit attributes from resource action is defined in.



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# File 'lib/haveapi/action.rb', line 224

def inherit_attrs_from_resource(action, r, attrs)
  begin
    return unless r.obj_type == :resource

  rescue NoMethodError
    return
  end

  attrs.each do |attr|
    action.method(attr).call(r.method(attr).call)
  end
end

.inherited(subclass) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 36

def inherited(subclass)
  # puts "Action.inherited called #{subclass} from #{to_s}"

  subclass.instance_variable_set(:@obj_type, obj_type)

  if subclass.name
    # not an anonymouse class
    delayed_inherited(subclass)
  end
end

.initialize ⇒ Object 



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# File 'lib/haveapi/action.rb', line 79

def initialize
  return if @initialized

  check_build("#{self}.input") do
    input.exec
    model_adapter(input.layout).load_validators(model, input) if model
  end

  check_build("#{self}.output") do
    output.exec
  end

  model_adapter(input.layout).used_by(:input, self)
  model_adapter(output.layout).used_by(:output, self)

  if blocking
    meta(:global) do
      output do
        integer :action_state_id,
            label: 'Action state ID',
            desc: 'ID of ActionState object for state querying. When null, the action '+
                  'is not blocking for the current invocation.'
      end
    end
  end

  if @meta
    @meta.each_value do |m|
      next unless m

      check_build("#{self}.meta.input") do
        m.input && m.input.exec
      end

      check_build("#{self}.meta.output") do
        m.output && m.output.exec
      end
    end
  end

  @initialized = true
end

.input(layout = nil, namespace: nil, &block) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 136

def input(layout = nil, namespace: nil, &block)
  if block
    @input ||= Params.new(:input, self)
    @input.layout = layout
    @input.namespace = namespace
    @input.add_block(block)
  else
    @input
  end
end

.meta(type = :object, &block) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 158

def meta(type = :object, &block)
  if block
    @meta ||= {object: nil, global: nil}
    @meta[type] ||= Metadata::ActionMetadata.new
    @meta[type].action = self
    @meta[type].instance_exec(&block)
  else
    @meta[type]
  end
end

.model_adapter(layout) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 132

def model_adapter(layout)
  ModelAdapter.for(layout, resource.model)
end

.output(layout = nil, namespace: nil, &block) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 147

def output(layout = nil, namespace: nil, &block)
  if block
    @output ||= Params.new(:output, self)
    @output.layout = layout
    @output.namespace = namespace
    @output.add_block(block)
  else
    @output
  end
end

.resolve_url_params(object) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 248

def resolve_url_params(object)
  if self.resolve
    self.resolve.call(object)

  else
    object.respond_to?(:id) ? object.id : nil
  end
end

.validate_build ⇒ Object 



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# File 'lib/haveapi/action.rb', line 122

def validate_build
  check_build("#{self}.input") do
    input.validate_build
  end

  check_build("#{self}.output") do
    output.validate_build
  end
end

Instance Method Details

#authorized?(user) ⇒ Boolean

Returns:



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# File 'lib/haveapi/action.rb', line 287

def authorized?(user)
  @current_user = user
  @authorization.authorized?(user)
end

#current_user ⇒ Object 



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# File 'lib/haveapi/action.rb', line 292

def current_user
  @current_user
end

#exec ⇒ Object

This method must be reimplemented in every action. It must not be invoked directly, only via safe_exec, which restricts output.



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# File 'lib/haveapi/action.rb', line 333

def exec
  ['not implemented']
end

#input ⇒ Object 



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# File 'lib/haveapi/action.rb', line 300

def input
  @safe_params[ self.class.input.namespace ] if self.class.input
end

#meta ⇒ Object 



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# File 'lib/haveapi/action.rb', line 308

def meta
  @metadata
end

#params ⇒ Object 



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# File 'lib/haveapi/action.rb', line 296

def params
  @safe_params
end

#pre_exec ⇒ Object 



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# File 'lib/haveapi/action.rb', line 327

def pre_exec

end

#prepare ⇒ Object

Prepare object, set instance variables from URL parameters. This method should return queried object. If the method is not implemented or returns nil, action description will not contain link to an associated resource.

FIXME: is this correct behaviour? ++



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# File 'lib/haveapi/action.rb', line 323

def prepare

end

#request ⇒ Object 



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# File 'lib/haveapi/action.rb', line 304

def request
  @request
end

#safe_exec ⇒ Object

Calls exec while catching all exceptions and restricting output only to what user can see. Return array [status, data|error, errors]



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# File 'lib/haveapi/action.rb', line 340

def safe_exec
  ret = catch(:return) do
    begin
      validate!
      prepare
      pre_exec
      exec
    rescue Exception => e
      tmp = call_class_hooks_as_for(Action, :exec_exception, args: [@context, e])

      if tmp.empty?
        p e.message
        puts e.backtrace
        error('Server error occurred')
      end

      unless tmp[:status]
        error(tmp[:message], {}, http_status: tmp[:http_status] || 500)
      end
    end
  end

  safe_output(ret)
end

#safe_output(ret) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 369

def safe_output(ret)
  if ret
    output = self.class.output

    if output
      safe_ret = nil
      adapter = self.class.model_adapter(output.layout)
      out_params = self.class.output.params

      case output.layout
        when :object
          out = adapter.output(@context, ret)
          safe_ret = @authorization.filter_output(
              out_params,
              out,
              true
          )
          @reply_meta[:global].update(out.meta)

        when :object_list
          safe_ret = []

          ret.each do |obj|
            out = adapter.output(@context, obj)

            safe_ret << @authorization.filter_output(
                out_params,
                out,
                true
            )
            safe_ret.last.update({Metadata.namespace => out.meta}) unless meta[:no]
          end

        when :hash
          safe_ret = @authorization.filter_output(
              out_params,
              adapter.output(@context, ret),
              true
          )

        when :hash_list
          safe_ret = ret
          safe_ret.map! do |hash|
            @authorization.filter_output(
                out_params,
                adapter.output(@context, hash),
                true
            )
          end

        else
          safe_ret = ret
      end

      if self.class.blocking
        @reply_meta[:global][:action_state_id] = state_id
      end

      ns = {output.namespace => safe_ret}
      ns[Metadata.namespace] = @reply_meta[:global] unless meta[:no]

      [true, ns]

    else
      [true, {}]
    end

  else
    [false, @message, @errors, @http_status]
  end
end

#set_meta(hash) ⇒ Object 



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# File 'lib/haveapi/action.rb', line 312

def set_meta(hash)
  @reply_meta[:global].update(hash)
end

#v?(v) ⇒ Boolean

Returns:



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# File 'lib/haveapi/action.rb', line 365

def v?(v)
  @version == v
end

#validate! ⇒ Object 



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# File 'lib/haveapi/action.rb', line 279

def validate!
  begin
    @params = validate
  rescue ValidationError => e
    error(e.message, e.to_hash)
  end
end