/usr/lib/ruby/vendor_ruby/merb-core/controller/abstract_controller.rb is in ruby-merb-core 1.1.3+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 | # ==== Why do we use Underscores?
# In Merb, views are actually methods on controllers. This provides
# not-insignificant speed benefits, as well as preventing us from
# needing to copy over instance variables, which we think is proof
# that everything belongs in one class to begin with.
#
# Unfortunately, this means that view helpers need to be included
# into the <strong>Controller</strong> class. To avoid causing confusion
# when your helpers potentially conflict with our instance methods,
# we use an _ to disambiguate. As long as you don't begin your helper
# methods with _, you only need to worry about conflicts with Merb
# methods that are part of the public API.
#
#
#
# ==== Filters
# #before is a class method that allows you to specify before filters in
# your controllers. Filters can either be a symbol or string that
# corresponds to a method name to call, or a proc object. if it is a method
# name that method will be called and if it is a proc it will be called
# with an argument of self where self is the current controller object.
# When you use a proc as a filter it needs to take one parameter.
#
# #after is identical, but the filters are run after the action is invoked.
#
# ===== Examples
# before :some_filter
# before :authenticate, :exclude => [:login, :signup]
# before :has_role, :with => ["Admin"], :exclude => [:index, :show]
# before Proc.new { some_method }, :only => :foo
# before :authorize, :unless => :logged_in?
#
# You can use either <code>:only => :actionname</code> or
# <code>:exclude => [:this, :that]</code> but not both at once.
# <code>:only</code> will only run before the listed actions and
# <code>:exclude</code> will run for every action that is not listed.
#
# Merb's before filter chain is very flexible. To halt the filter chain you
# use <code>throw :halt</code>. If <code>throw</code> is called with only one
# argument of <code>:halt</code> the return value of the method
# <code>filters_halted</code> will be what is rendered to the view. You can
# override <code>filters_halted</code> in your own controllers to control what
# it outputs. But the <code>throw</code> construct is much more powerful than
# just that.
#
# <code>throw :halt</code> can also take a second argument. Here is what that
# second argument can be and the behavior each type can have:
#
# * +String+:
# when the second argument is a string then that string will be what
# is rendered to the browser. Since merb's <code>#render</code> method returns
# a string you can render a template or just use a plain string:
#
# throw :halt, "You don't have permissions to do that!"
# throw :halt, render(:action => :access_denied)
#
# * +Symbol+:
# If the second arg is a symbol, then the method named after that
# symbol will be called
#
# throw :halt, :must_click_disclaimer
#
# * +Proc+:
# If the second arg is a Proc, it will be called and its return
# value will be what is rendered to the browser:
#
# throw :halt, proc { access_denied }
# throw :halt, proc { Tidy.new(c.index) }
#
# ===== Filter Options (.before, .after, .add_filter, .if, .unless)
# :only<Symbol, Array[Symbol]>::
# A list of actions that this filter should apply to
#
# :exclude<Symbol, Array[Symbol]::
# A list of actions that this filter should *not* apply to
#
# :if<Symbol, Proc>::
# Only apply the filter if the method named after the symbol or calling the proc evaluates to true
#
# :unless<Symbol, Proc>::
# Only apply the filter if the method named after the symbol or calling the proc evaluates to false
#
# :with<Array[Object]>::
# Arguments to be passed to the filter. Since we are talking method/proc calls,
# filter method or Proc should to have the same arity
# as number of elements in Array you pass to this option.
#
# ===== Types (shortcuts for use in this file)
# Filter:: <Array[Symbol, (Symbol, String, Proc)]>
#
# ==== params[:action] and params[:controller] deprecated
# <code>params[:action]</code> and <code>params[:controller]</code> have been deprecated as of
# the 0.9.0 release. They are no longer set during dispatch, and
# have been replaced by <code>action_name</code> and <code>controller_name</code> respectively.
module Merb
module InlineTemplates; end
class AbstractController
include Merb::RenderMixin
include Merb::InlineTemplates
class_inheritable_accessor :_layout, :_template_root, :template_roots
class_inheritable_accessor :_before_filters, :_after_filters
class_inheritable_accessor :_before_dispatch_callbacks, :_after_dispatch_callbacks
cattr_accessor :_abstract_subclasses
# :api: plugin
attr_accessor :body, :action_name, :_benchmarks
# :api: private
attr_accessor :_thrown_content
# Stub so content-type support in RenderMixin doesn't throw errors
# :api: private
attr_accessor :content_type
FILTER_OPTIONS = [:only, :exclude, :if, :unless, :with]
self._before_filters, self._after_filters = [], []
self._before_dispatch_callbacks, self._after_dispatch_callbacks = [], []
#---
# We're using abstract_subclasses so that Merb::Controller can have its
# own subclasses. We're using a Set so we don't have to worry about
# uniqueness.
self._abstract_subclasses = Set.new
# ==== Returns
# String:: The controller name in path form, e.g. "admin/items".
# :api: public
def self.controller_name() @controller_name ||= self.name.to_const_path end
# ==== Returns
# String:: The controller name in path form, e.g. "admin/items".
#
# :api: public
def controller_name() self.class.controller_name end
# This is called after the controller is instantiated to figure out where to
# look for templates under the _template_root. Override this to define a new
# structure for your app.
#
# ==== Parameters
# context<~to_s>:: The controller context (the action or template name).
# type<~to_s>:: The content type. Could be nil.
# controller<~to_s>::
# The name of the controller. Defaults to being called with the controller_name. Set t
#
#
# ==== Returns
# String::
# Indicating where to look for the template for the current controller,
# context, and content-type.
#
# ==== Notes
# The type is irrelevant for controller-types that don't support
# content-type negotiation, so we default to not include it in the
# superclass.
#
# ==== Examples
# def _template_location
# "#{params[:controller]}.#{params[:action]}.#{content_type}"
# end
#
# This would look for templates at controller.action.mime.type instead
# of controller/action.mime.type
#
# :api: public
# @overridable
def _template_location(context, type, controller)
controller ? "#{controller}/#{context}" : context
end
# The location to look for a template - override this method for particular behaviour.
#
# ==== Parameters
# template<String>:: The absolute path to a template - without template extension.
# type<~to_s>::
# The mime-type of the template that will be rendered. Defaults to being called with nil.
#
# :api: public
# @overridable
def _absolute_template_location(template, type)
template
end
# Resets the template roots to the template root passed in.
#
# ==== Parameters
# root<~to_s>::
# The new path to set the template root to.
#
# :api: public
def self._template_root=(root)
@_template_root = root
_reset_template_roots
end
# Reset the template root based on the @_template_root ivar.
#
# :api: private
def self._reset_template_roots
self.template_roots = [[self._template_root, :_template_location]]
end
# ==== Returns
# roots<Array[Array]>::
# Template roots as pairs of template root path and template location
# method.
#
# :api: plugin
def self._template_roots
self.template_roots || _reset_template_roots
end
# ==== Parameters
# roots<Array[Array]>::
# Template roots as pairs of template root path and template location
# method.
#
# :api: plugin
def self._template_roots=(roots)
self.template_roots = roots
end
# Returns the list of classes that have specifically subclassed AbstractController.
# Does not include all decendents.
#
# ==== Returns
# Set:: The subclasses.
#
# :api: private
def self.subclasses_list() _abstract_subclasses end
# ==== Parameters
# klass<Merb::AbstractController>::
# The controller that is being inherited from Merb::AbstractController
#
# :api: private
def self.inherited(klass)
_abstract_subclasses << klass.to_s
helper_module_name = klass.to_s =~ /^(#|Merb::)/ ? "#{klass}Helper" : "Merb::#{klass}Helper"
# support for unnamed module like "#<Class:0xa2e5e50>::TestController"
helper_module_name.gsub!(/(::)|[:#<>]/, "\\1")
Object.make_module helper_module_name
klass.class_eval <<-HERE
include Object.full_const_get("#{helper_module_name}") rescue nil
HERE
super
end
# This will initialize the controller, it is designed to be overridden in subclasses (like MerbController)
# ==== Parameters
# *args:: The args are ignored in this class, but we need this so that subclassed initializes can have parameters
#
# :api: private
def initialize(*args)
@_benchmarks = {}
@_caught_content = {}
end
# This will dispatch the request, calling internal before/after dispatch callbacks.
# If the return value of _call_filters is not :filter_chain_completed the action is not called, and the return from the filters is used instead.
#
# ==== Parameters
# action<~to_s>::
# The action to dispatch to. This will be #send'ed in _call_action.
# Defaults to :to_s.
#
# ==== Returns
# <~to_s>::
# Returns the string that was returned from the action.
#
# ==== Raises
# ArgumentError:: Invalid result caught from before filters.
#
# :api: plugin
def _dispatch(action)
self.action_name = action
self._before_dispatch_callbacks.each { |cb| cb.call(self) }
caught = catch(:halt) do
start = Time.now
result = _call_filters(_before_filters)
@_benchmarks[:before_filters_time] = Time.now - start if _before_filters
@body = _call_action(action_name) if result == :filter_chain_completed
result
end
@body = case caught
when :filter_chain_completed then @body
when String then caught
# return *something* if you throw halt with nothing
when nil then "<html><body><h1>Filter Chain Halted!</h1></body></html>"
when Symbol then __send__(caught)
when Proc then self.instance_eval(&caught)
else
raise ArgumentError, "Threw :halt, #{caught}. Expected String, nil, Symbol, Proc."
end
start = Time.now
_call_filters(_after_filters)
@_benchmarks[:after_filters_time] = Time.now - start if _after_filters
self._after_dispatch_callbacks.each { |cb| cb.call(self) }
@body
end
# This method exists to provide an overridable hook for ActionArgs. It uses #send to call the action method.
#
# ==== Parameters
# action<~to_s>:: the action method to dispatch to
#
# :api: plugin
# @overridable
def _call_action(action)
send(action)
end
# Calls a filter chain.
#
# ==== Parameters
# filter_set<Array[Filter]>::
# A set of filters in the form [[:filter, rule], [:filter, rule]]
#
# ==== Returns
# Symbol:: :filter_chain_completed.
#
# ==== Notes
# Filter rules can be Symbols, Strings, or Procs.
#
# Symbols or Strings::
# Call the method represented by the +Symbol+ or +String+.
# Procs::
# Execute the +Proc+, in the context of the controller (self will be the
# controller)
#
# :api: private
def _call_filters(filter_set)
(filter_set || []).each do |filter, rule|
if _call_filter_for_action?(rule, action_name) && _filter_condition_met?(rule)
case filter
when Symbol, String
if rule.key?(:with)
args = rule[:with]
send(filter, *args)
else
send(filter)
end
when Proc then self.instance_eval(&filter)
end
end
end
return :filter_chain_completed
end
# Determine whether the filter should be called for the current action using :only and :exclude.
#
# ==== Parameters
# rule<Hash>:: Rules for the filter (see below).
# action_name<~to_s>:: The name of the action to be called.
#
# ==== Options (rule)
# :only<Array>::
# Optional list of actions to fire. If given, action_name must be a part of
# it for this function to return true.
# :exclude<Array>::
# Optional list of actions not to fire. If given, action_name must not be a
# part of it for this function to return true.
#
# ==== Returns
# Boolean:: True if the action should be called.
#
# :api: private
def _call_filter_for_action?(rule, action_name)
# Both:
# * no :only or the current action is in the :only list
# * no :exclude or the current action is not in the :exclude list
(!rule.key?(:only) || rule[:only].include?(action_name)) &&
(!rule.key?(:exclude) || !rule[:exclude].include?(action_name))
end
# Determines whether the filter should be run based on the conditions passed (:if and :unless)
#
# ==== Parameters
# rule<Hash>:: Rules for the filter (see below).
#
# ==== Options (rule)
# :if<Array>:: Optional conditions that must be met for the filter to fire.
# :unless<Array>::
# Optional conditions that must not be met for the filter to fire.
#
# ==== Returns
# Boolean:: True if the conditions are met.
#
# :api: private
def _filter_condition_met?(rule)
# Both:
# * no :if or the if condition evaluates to true
# * no :unless or the unless condition evaluates to false
(!rule.key?(:if) || _evaluate_condition(rule[:if])) &&
(!rule.key?(:unless) || ! _evaluate_condition(rule[:unless]))
end
# Evaluates a filter condition (:if or :unless)
#
# ==== Parameters
# condition<Symbol, Proc>:: The condition to evaluate.
#
# ==== Raises
# ArgumentError:: condition not a Symbol or Proc.
#
# ==== Returns
# Boolean:: True if the condition is met.
#
# ==== Alternatives
# If condition is a symbol, it will be send'ed. If it is a Proc it will be
# called directly with self as an argument.
#
# :api: private
def _evaluate_condition(condition)
case condition
when Symbol then self.send(condition)
when Proc then self.instance_eval(&condition)
else
raise ArgumentError,
'Filter condtions need to be either a Symbol or a Proc'
end
end
# Adds a filter to the after filter chain
# ==== Parameters
# filter<Symbol, Proc>:: The filter to add. Defaults to nil.
# opts<Hash>::
# Filter options (see class documentation under <tt>Filter Options</tt>).
# &block:: A block to use as a filter if filter is nil.
#
# ==== Notes
# If the filter already exists, its options will be replaced with opts.;
#
# :api: public
def self.after(filter = nil, opts = {}, &block)
add_filter(self._after_filters, filter || block, opts)
end
# Adds a filter to the before filter chain.
#
# ==== Parameters
# filter<Symbol, Proc>:: The filter to add. Defaults to nil.
# opts<Hash>::
# Filter options (see class documentation under <tt>Filter Options</tt>).
# &block:: A block to use as a filter if filter is nil.
#
# ==== Notes
# If the filter already exists, its options will be replaced with opts.
#
# :api: public
def self.before(filter = nil, opts = {}, &block)
add_filter(self._before_filters, filter || block, opts)
end
# Removes a filter from the after filter chain. This removes the
# filter from the filter chain for the whole controller and does not
# take any options.
#
# ==== Parameters
# filter<Symbol, String>:: A filter name to skip.
#
# :api: public
def self.skip_after(filter)
skip_filter(self._after_filters, filter)
end
# Removes a filter from the before filter chain. This removes the
# filter from the filter chain for the whole controller and does not
# take any options.
#
# ==== Parameters
# filter<Symbol, String>:: A filter name to skip.
#
# :api: public
def self.skip_before(filter)
skip_filter(self._before_filters , filter)
end
# There are three possible ways to use this method. First, if you have a named route,
# you can specify the route as the first parameter as a symbol and any paramters in a
# hash. Second, you can generate the default route by just passing the params hash,
# just passing the params hash. Finally, you can use the anonymous parameters. This
# allows you to specify the parameters to a named route in the order they appear in the
# router.
#
# ==== Parameters(Named Route)
# name<Symbol>::
# The name of the route.
# args<Hash>::
# Parameters for the route generation.
#
# ==== Parameters(Default Route)
# args<Hash>::
# Parameters for the route generation. This route will use the default route.
#
# ==== Parameters(Anonymous Parameters)
# name<Symbol>::
# The name of the route.
# args<Array>::
# An array of anonymous parameters to generate the route
# with. These parameters are assigned to the route parameters
# in the order that they are passed.
#
# ==== Returns
# String:: The generated URL.
#
# ==== Examples
# Named Route
#
# Merb::Router.prepare do
# match("/articles/:title").to(:controller => :articles, :action => :show).name("articles")
# end
#
# url(:articles, :title => "new_article")
#
# Default Route
#
# Merb::Router.prepare do
# default_routes
# end
#
# url(:controller => "articles", :action => "new")
#
# Anonymous Paramters
#
# Merb::Router.prepare do
# match("/articles/:year/:month/:title").to(:controller => :articles, :action => :show).name("articles")
# end
#
# url(:articles, 2008, 10, "test_article")
#
# :api: public
def url(name, *args)
args << {}
Merb::Router.url(name, *args)
end
alias_method :relative_url, :url
# Returns the absolute url including the passed protocol and host.
#
# This uses the same arguments as the url method, with added requirements
# of protocol and host options.
#
# :api: public
def absolute_url(*args)
# FIXME: arrgh, why request.protocol returns http://?
# :// is not part of protocol name
options = extract_options_from_args!(args) || {}
protocol = options.delete(:protocol)
host = options.delete(:host)
raise ArgumentError, "The :protocol option must be specified" unless protocol
raise ArgumentError, "The :host option must be specified" unless host
args << options
protocol + "://" + host + url(*args)
end
# Generates a URL for a single or nested resource.
#
# ==== Parameters
# resources<Symbol,Object>:: The resources for which the URL
# should be generated. These resources should be specified
# in the router.rb file using #resources and #resource.
#
# options<Hash>:: Any extra parameters that are needed to
# generate the URL.
#
# ==== Returns
# String:: The generated URL.
#
# ==== Examples
#
# Merb::Router.prepare do
# resources :users do
# resources :comments
# end
# end
#
# resource(:users) # => /users
# resource(@user) # => /users/10
# resource(@user, :comments) # => /users/10/comments
# resource(@user, @comment) # => /users/10/comments/15
# resource(:users, :new) # => /users/new
# resource(:@user, :edit) # => /users/10/edit
#
# :api: public
def resource(*args)
args << {}
Merb::Router.resource(*args)
end
# Calls the capture method for the selected template engine.
#
# ==== Parameters
# *args:: Arguments to pass to the block.
# &block:: The block to call.
#
# ==== Returns
# String:: The output of a template block or the return value of a non-template block converted to a string.
#
# :api: public
def capture(*args, &block)
ret = nil
captured = send("capture_#{@_engine}", *args) do |*args|
ret = yield *args
end
# return captured value only if it is not empty
captured.empty? ? ret.to_s : captured
end
# Calls the concatenate method for the selected template engine.
#
# ==== Parameters
# str<String>:: The string to concatenate to the buffer.
# binding<Binding>:: The binding to use for the buffer.
#
# :api: public
def concat(str, binding)
send("concat_#{@_engine}", str, binding)
end
private
# adds a filter to the specified filter chain
# ==== Parameters
# filters<Array[Filter]>:: The filter chain that this should be added to.
# filter<Filter>:: A filter that should be added.
# opts<Hash>::
# Filter options (see class documentation under <tt>Filter Options</tt>).
#
# ==== Raises
# ArgumentError::
# Both :only and :exclude, or :if and :unless given, if filter is not a
# Symbol, String or Proc, or if an unknown option is passed.
#
# :api: private
def self.add_filter(filters, filter, opts={})
raise(ArgumentError,
"You can specify either :only or :exclude but
not both at the same time for the same filter.") if opts.key?(:only) && opts.key?(:exclude)
raise(ArgumentError,
"You can specify either :if or :unless but
not both at the same time for the same filter.") if opts.key?(:if) && opts.key?(:unless)
opts.each_key do |key| raise(ArgumentError,
"You can only specify known filter options, #{key} is invalid.") unless FILTER_OPTIONS.include?(key)
end
opts = normalize_filters!(opts)
case filter
when Proc
# filters with procs created via class methods have identical signature
# regardless if they handle content differently or not. So procs just
# get appended
filters << [filter, opts]
when Symbol, String
if existing_filter = filters.find {|f| f.first.to_s == filter.to_s}
filters[ filters.index(existing_filter) ] = [filter, opts]
else
filters << [filter, opts]
end
else
raise(ArgumentError,
'Filters need to be either a Symbol, String or a Proc'
)
end
end
# Skip a filter that was previously added to the filter chain. Useful in
# inheritence hierarchies.
#
# ==== Parameters
# filters<Array[Filter]>:: The filter chain that this should be removed from.
# filter<Filter>:: A filter that should be removed.
#
# ==== Raises
# ArgumentError:: filter not Symbol or String.
#
# :api: private
def self.skip_filter(filters, filter)
raise(ArgumentError, 'You can only skip filters that have a String or Symbol name.') unless
[Symbol, String].include? filter.class
Merb.logger.warn("Filter #{filter} was not found in your filter chain.") unless
filters.reject! {|f| f.first.to_s[filter.to_s] }
end
# Ensures that the passed in hash values are always arrays.
#
# ==== Parameters
# opts<Hash>:: Options for the filters (see below).
#
# ==== Options (opts)
# :only<Symbol, Array[Symbol]>:: A list of actions.
# :exclude<Symbol, Array[Symbol]>:: A list of actions.
#
# ==== Examples
# normalize_filters!(:only => :new) #=> {:only => [:new]}
#
# :api: public
def self.normalize_filters!(opts={})
opts[:only] = Array(opts[:only]).map {|x| x.to_s} if opts[:only]
opts[:exclude] = Array(opts[:exclude]).map {|x| x.to_s} if opts[:exclude]
return opts
end
end
end
|