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285 lines
9.5 KiB
Ruby
285 lines
9.5 KiB
Ruby
require 'active_support/core_ext/hash/slice'
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require 'active_support/core_ext/hash/except'
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require 'active_support/core_ext/module/anonymous'
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require 'active_support/core_ext/struct'
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require 'action_dispatch/http/mime_type'
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module ActionController
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# Wraps the parameters hash into a nested hash. This will allow clients to submit
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# POST requests without having to specify any root elements.
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#
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# This functionality is enabled in +config/initializers/wrap_parameters.rb+
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# and can be customized. If you are upgrading to \Rails 3.1, this file will
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# need to be created for the functionality to be enabled.
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#
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# You could also turn it on per controller by setting the format array to
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# a non-empty array:
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#
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# class UsersController < ApplicationController
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# wrap_parameters format: [:json, :xml]
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# end
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#
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# If you enable +ParamsWrapper+ for +:json+ format, instead of having to
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# send JSON parameters like this:
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#
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# {"user": {"name": "Konata"}}
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#
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# You can send parameters like this:
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#
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# {"name": "Konata"}
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#
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# And it will be wrapped into a nested hash with the key name matching the
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# controller's name. For example, if you're posting to +UsersController+,
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# your new +params+ hash will look like this:
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#
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# {"name" => "Konata", "user" => {"name" => "Konata"}}
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#
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# You can also specify the key in which the parameters should be wrapped to,
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# and also the list of attributes it should wrap by using either +:include+ or
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# +:exclude+ options like this:
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#
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# class UsersController < ApplicationController
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# wrap_parameters :person, include: [:username, :password]
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# end
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#
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# On ActiveRecord models with no +:include+ or +:exclude+ option set,
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# it will only wrap the parameters returned by the class method
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# <tt>attribute_names</tt>.
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#
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# If you're going to pass the parameters to an +ActiveModel+ object (such as
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# <tt>User.new(params[:user])</tt>), you might consider passing the model class to
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# the method instead. The +ParamsWrapper+ will actually try to determine the
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# list of attribute names from the model and only wrap those attributes:
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#
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# class UsersController < ApplicationController
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# wrap_parameters Person
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# end
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#
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# You still could pass +:include+ and +:exclude+ to set the list of attributes
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# you want to wrap.
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#
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# By default, if you don't specify the key in which the parameters would be
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# wrapped to, +ParamsWrapper+ will actually try to determine if there's
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# a model related to it or not. This controller, for example:
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#
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# class Admin::UsersController < ApplicationController
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# end
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#
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# will try to check if <tt>Admin::User</tt> or +User+ model exists, and use it to
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# determine the wrapper key respectively. If both models don't exist,
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# it will then fallback to use +user+ as the key.
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module ParamsWrapper
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extend ActiveSupport::Concern
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EXCLUDE_PARAMETERS = %w(authenticity_token _method utf8)
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require 'mutex_m'
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class Options < Struct.new(:name, :format, :include, :exclude, :klass, :model) # :nodoc:
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include Mutex_m
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def self.from_hash(hash)
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name = hash[:name]
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format = Array(hash[:format])
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include = hash[:include] && Array(hash[:include]).collect(&:to_s)
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exclude = hash[:exclude] && Array(hash[:exclude]).collect(&:to_s)
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new name, format, include, exclude, nil, nil
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end
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def initialize(name, format, include, exclude, klass, model) # nodoc
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super
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@include_set = include
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@name_set = name
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end
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def model
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super || synchronize { super || self.model = _default_wrap_model }
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end
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def include
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return super if @include_set
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m = model
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synchronize do
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return super if @include_set
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@include_set = true
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unless super || exclude
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if m.respond_to?(:attribute_names) && m.attribute_names.any?
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self.include = m.attribute_names
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end
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end
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end
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end
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def name
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return super if @name_set
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m = model
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synchronize do
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return super if @name_set
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@name_set = true
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unless super || klass.anonymous?
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self.name = m ? m.to_s.demodulize.underscore :
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klass.controller_name.singularize
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end
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end
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end
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private
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# Determine the wrapper model from the controller's name. By convention,
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# this could be done by trying to find the defined model that has the
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# same singularize name as the controller. For example, +UsersController+
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# will try to find if the +User+ model exists.
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#
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# This method also does namespace lookup. Foo::Bar::UsersController will
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# try to find Foo::Bar::User, Foo::User and finally User.
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def _default_wrap_model #:nodoc:
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return nil if klass.anonymous?
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model_name = klass.name.sub(/Controller$/, '').classify
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begin
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if model_klass = model_name.safe_constantize
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model_klass
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else
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namespaces = model_name.split("::")
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namespaces.delete_at(-2)
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break if namespaces.last == model_name
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model_name = namespaces.join("::")
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end
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end until model_klass
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model_klass
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end
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end
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included do
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class_attribute :_wrapper_options
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self._wrapper_options = Options.from_hash(format: [])
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end
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module ClassMethods
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def _set_wrapper_options(options)
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self._wrapper_options = Options.from_hash(options)
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end
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# Sets the name of the wrapper key, or the model which +ParamsWrapper+
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# would use to determine the attribute names from.
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#
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# ==== Examples
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# wrap_parameters format: :xml
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# # enables the parameter wrapper for XML format
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#
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# wrap_parameters :person
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# # wraps parameters into +params[:person]+ hash
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#
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# wrap_parameters Person
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# # wraps parameters by determining the wrapper key from Person class
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# (+person+, in this case) and the list of attribute names
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#
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# wrap_parameters include: [:username, :title]
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# # wraps only +:username+ and +:title+ attributes from parameters.
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#
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# wrap_parameters false
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# # disables parameters wrapping for this controller altogether.
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#
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# ==== Options
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# * <tt>:format</tt> - The list of formats in which the parameters wrapper
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# will be enabled.
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# * <tt>:include</tt> - The list of attribute names which parameters wrapper
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# will wrap into a nested hash.
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# * <tt>:exclude</tt> - The list of attribute names which parameters wrapper
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# will exclude from a nested hash.
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def wrap_parameters(name_or_model_or_options, options = {})
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model = nil
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case name_or_model_or_options
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when Hash
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options = name_or_model_or_options
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when false
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options = options.merge(:format => [])
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when Symbol, String
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options = options.merge(:name => name_or_model_or_options)
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else
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model = name_or_model_or_options
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end
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opts = Options.from_hash _wrapper_options.to_h.slice(:format).merge(options)
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opts.model = model
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opts.klass = self
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self._wrapper_options = opts
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end
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# Sets the default wrapper key or model which will be used to determine
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# wrapper key and attribute names. Will be called automatically when the
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# module is inherited.
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def inherited(klass)
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if klass._wrapper_options.format.any?
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params = klass._wrapper_options.dup
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params.klass = klass
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klass._wrapper_options = params
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end
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super
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end
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end
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# Performs parameters wrapping upon the request. Will be called automatically
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# by the metal call stack.
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def process_action(*args)
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if _wrapper_enabled?
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if request.parameters[_wrapper_key].present?
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wrapped_hash = _extract_parameters(request.parameters)
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else
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wrapped_hash = _wrap_parameters request.request_parameters
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end
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wrapped_keys = request.request_parameters.keys
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wrapped_filtered_hash = _wrap_parameters request.filtered_parameters.slice(*wrapped_keys)
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# This will make the wrapped hash accessible from controller and view
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request.parameters.merge! wrapped_hash
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request.request_parameters.merge! wrapped_hash
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# This will make the wrapped hash displayed in the log file
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request.filtered_parameters.merge! wrapped_filtered_hash
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end
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super
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end
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private
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# Returns the wrapper key which will use to stored wrapped parameters.
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def _wrapper_key
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_wrapper_options.name
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end
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# Returns the list of enabled formats.
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def _wrapper_formats
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_wrapper_options.format
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end
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# Returns the list of parameters which will be selected for wrapped.
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def _wrap_parameters(parameters)
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{ _wrapper_key => _extract_parameters(parameters) }
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end
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def _extract_parameters(parameters)
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if include_only = _wrapper_options.include
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parameters.slice(*include_only)
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else
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exclude = _wrapper_options.exclude || []
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parameters.except(*(exclude + EXCLUDE_PARAMETERS))
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end
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end
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# Checks if we should perform parameters wrapping.
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def _wrapper_enabled?
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ref = request.content_mime_type.try(:ref)
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_wrapper_formats.include?(ref) && _wrapper_key && !request.request_parameters[_wrapper_key]
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end
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end
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end
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