aboutsummaryrefslogtreecommitdiffstats
path: root/actionpack/lib/action_dispatch/http/response.rb
blob: 6483bb380488c62f5292a19e4d9a1286ea1b5277 (plain) (blame)
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
require "active_support/core_ext/module/attribute_accessors"
require "action_dispatch/http/filter_redirect"
require "action_dispatch/http/cache"
require "monitor"

module ActionDispatch # :nodoc:
  # Represents an HTTP response generated by a controller action. Use it to
  # retrieve the current state of the response, or customize the response. It can
  # either represent a real HTTP response (i.e. one that is meant to be sent
  # back to the web browser) or a TestResponse (i.e. one that is generated
  # from integration tests).
  #
  # \Response is mostly a Ruby on \Rails framework implementation detail, and
  # should never be used directly in controllers. Controllers should use the
  # methods defined in ActionController::Base instead. For example, if you want
  # to set the HTTP response's content MIME type, then use
  # ActionControllerBase#headers instead of Response#headers.
  #
  # Nevertheless, integration tests may want to inspect controller responses in
  # more detail, and that's when \Response can be useful for application
  # developers. Integration test methods such as
  # ActionDispatch::Integration::Session#get and
  # ActionDispatch::Integration::Session#post return objects of type
  # TestResponse (which are of course also of type \Response).
  #
  # For example, the following demo integration test prints the body of the
  # controller response to the console:
  #
  #  class DemoControllerTest < ActionDispatch::IntegrationTest
  #    def test_print_root_path_to_console
  #      get('/')
  #      puts response.body
  #    end
  #  end
  class Response
    class Header < DelegateClass(Hash) # :nodoc:
      def initialize(response, header)
        @response = response
        super(header)
      end

      def []=(k,v)
        if @response.sending? || @response.sent?
          raise ActionDispatch::IllegalStateError, "header already sent"
        end

        super
      end

      def merge(other)
        self.class.new @response, __getobj__.merge(other)
      end

      def to_hash
        __getobj__.dup
      end
    end

    # The request that the response is responding to.
    attr_accessor :request

    # The HTTP status code.
    attr_reader :status

    # Get headers for this response.
    attr_reader :header

    alias_method :headers,  :header

    delegate :[], :[]=, to: :@header

    def each(&block)
      sending!
      x = @stream.each(&block)
      sent!
      x
    end

    CONTENT_TYPE = "Content-Type".freeze
    SET_COOKIE   = "Set-Cookie".freeze
    LOCATION     = "Location".freeze
    NO_CONTENT_CODES = [100, 101, 102, 204, 205, 304]

    cattr_accessor(:default_charset) { "utf-8" }
    cattr_accessor(:default_headers)

    include Rack::Response::Helpers
    # Aliasing these off because AD::Http::Cache::Response defines them
    alias :_cache_control :cache_control
    alias :_cache_control= :cache_control=

    include ActionDispatch::Http::FilterRedirect
    include ActionDispatch::Http::Cache::Response
    include MonitorMixin

    class Buffer # :nodoc:
      def initialize(response, buf)
        @response = response
        @buf      = buf
        @closed   = false
        @str_body = nil
      end

      def body
        @str_body ||= begin
          buf = ""
            each { |chunk| buf << chunk }
          buf
        end
      end

      def write(string)
        raise IOError, "closed stream" if closed?

        @str_body = nil
        @response.commit!
        @buf.push string
      end

      def each(&block)
        if @str_body
          return enum_for(:each) unless block_given?

          yield @str_body
        else
          each_chunk(&block)
        end
      end

      def abort
      end

      def close
        @response.commit!
        @closed = true
      end

      def closed?
        @closed
      end

      private

        def each_chunk(&block)
          @buf.each(&block) # extract into own method
        end
    end

    def self.create(status = 200, header = {}, body = [], default_headers: self.default_headers)
      header = merge_default_headers(header, default_headers)
      new status, header, body
    end

    def self.merge_default_headers(original, default)
      default.respond_to?(:merge) ? default.merge(original) : original
    end

    # The underlying body, as a streamable object.
    attr_reader :stream

    def initialize(status = 200, header = {}, body = [])
      super()

      @header = Header.new(self, header)

      self.body, self.status = body, status

      @cv           = new_cond
      @committed    = false
      @sending      = false
      @sent         = false

      prepare_cache_control!

      yield self if block_given?
    end

    def has_header?(key);   headers.key? key;   end
    def get_header(key);    headers[key];       end
    def set_header(key, v); headers[key] = v;   end
    def delete_header(key); headers.delete key; end

    def await_commit
      synchronize do
        @cv.wait_until { @committed }
      end
    end

    def await_sent
      synchronize { @cv.wait_until { @sent } }
    end

    def commit!
      synchronize do
        before_committed
        @committed = true
        @cv.broadcast
      end
    end

    def sending!
      synchronize do
        before_sending
        @sending = true
        @cv.broadcast
      end
    end

    def sent!
      synchronize do
        @sent = true
        @cv.broadcast
      end
    end

    def sending?;   synchronize { @sending };   end
    def committed?; synchronize { @committed }; end
    def sent?;      synchronize { @sent };      end

    # Sets the HTTP status code.
    def status=(status)
      @status = Rack::Utils.status_code(status)
    end

    # Sets the HTTP content type.
    def content_type=(content_type)
      header_info = parse_content_type
      set_content_type content_type.to_s, header_info.charset || self.class.default_charset
    end

    # Sets the HTTP response's content MIME type. For example, in the controller
    # you could write this:
    #
    #  response.content_type = "text/plain"
    #
    # If a character set has been defined for this response (see charset=) then
    # the character set information will also be included in the content type
    # information.

    def content_type
      parse_content_type.mime_type
    end

    def sending_file=(v)
      if true == v
        self.charset = false
      end
    end

    # Sets the HTTP character set. In case of nil parameter
    # it sets the charset to utf-8.
    #
    #   response.charset = 'utf-16' # => 'utf-16'
    #   response.charset = nil      # => 'utf-8'
    def charset=(charset)
      header_info = parse_content_type
      if false == charset
        set_header CONTENT_TYPE, header_info.mime_type
      else
        content_type = header_info.mime_type
        set_content_type content_type, charset || self.class.default_charset
      end
    end

    # The charset of the response. HTML wants to know the encoding of the
    # content you're giving them, so we need to send that along.
    def charset
      header_info = parse_content_type
      header_info.charset || self.class.default_charset
    end

    # The response code of the request.
    def response_code
      @status
    end

    # Returns a string to ensure compatibility with <tt>Net::HTTPResponse</tt>.
    def code
      @status.to_s
    end

    # Returns the corresponding message for the current HTTP status code:
    #
    #   response.status = 200
    #   response.message # => "OK"
    #
    #   response.status = 404
    #   response.message # => "Not Found"
    #
    def message
      Rack::Utils::HTTP_STATUS_CODES[@status]
    end
    alias_method :status_message, :message

    # Returns the content of the response as a string. This contains the contents
    # of any calls to <tt>render</tt>.
    def body
      @stream.body
    end

    def write(string)
      @stream.write string
    end

    # Allows you to manually set or override the response body.
    def body=(body)
      if body.respond_to?(:to_path)
        @stream = body
      else
        synchronize do
          @stream = build_buffer self, munge_body_object(body)
        end
      end
    end

    # Avoid having to pass an open file handle as the response body.
    # Rack::Sendfile will usually intercept the response and uses
    # the path directly, so there is no reason to open the file.
    class FileBody #:nodoc:
      attr_reader :to_path

      def initialize(path)
        @to_path = path
      end

      def body
        File.binread(to_path)
      end

      # Stream the file's contents if Rack::Sendfile isn't present.
      def each
        File.open(to_path, "rb") do |file|
          while chunk = file.read(16384)
            yield chunk
          end
        end
      end
    end

    # Send the file stored at +path+ as the response body.
    def send_file(path)
      commit!
      @stream = FileBody.new(path)
    end

    def reset_body!
      @stream = build_buffer(self, [])
    end

    def body_parts
      parts = []
      @stream.each { |x| parts << x }
      parts
    end

    # The location header we'll be responding with.
    alias_method :redirect_url, :location

    def close
      stream.close if stream.respond_to?(:close)
    end

    def abort
      if stream.respond_to?(:abort)
        stream.abort
      elsif stream.respond_to?(:close)
        # `stream.close` should really be reserved for a close from the
        # other direction, but we must fall back to it for
        # compatibility.
        stream.close
      end
    end

    # Turns the Response into a Rack-compatible array of the status, headers,
    # and body. Allows explicit splatting:
    #
    #   status, headers, body = *response
    def to_a
      commit!
      rack_response @status, @header.to_hash
    end
    alias prepare! to_a

    # Returns the response cookies, converted to a Hash of (name => value) pairs
    #
    #   assert_equal 'AuthorOfNewPage', r.cookies['author']
    def cookies
      cookies = {}
      if header = get_header(SET_COOKIE)
        header = header.split("\n") if header.respond_to?(:to_str)
        header.each do |cookie|
          if pair = cookie.split(";").first
            key, value = pair.split("=").map { |v| Rack::Utils.unescape(v) }
            cookies[key] = value
          end
        end
      end
      cookies
    end

  private

    ContentTypeHeader = Struct.new :mime_type, :charset
    NullContentTypeHeader = ContentTypeHeader.new nil, nil

    def parse_content_type
      content_type = get_header CONTENT_TYPE
      if content_type
        type, charset = content_type.split(/;\s*charset=/)
        type = nil if type.empty?
        ContentTypeHeader.new(type, charset)
      else
        NullContentTypeHeader
      end
    end

    def set_content_type(content_type, charset)
      type = (content_type || "").dup
      type << "; charset=#{charset}" if charset
      set_header CONTENT_TYPE, type
    end

    def before_committed
      return if committed?
      assign_default_content_type_and_charset!
      handle_conditional_get!
      handle_no_content!
    end

    def before_sending
      # Normally we've already committed by now, but it's possible
      # (e.g., if the controller action tries to read back its own
      # response) to get here before that. In that case, we must force
      # an "early" commit: we're about to freeze the headers, so this is
      # our last chance.
      commit! unless committed?

      headers.freeze
      request.commit_cookie_jar! unless committed?
    end

    def build_buffer(response, body)
      Buffer.new response, body
    end

    def munge_body_object(body)
      body.respond_to?(:each) ? body : [body]
    end

    def assign_default_content_type_and_charset!
      return if content_type

      ct = parse_content_type
      set_content_type(ct.mime_type || Mime[:html].to_s,
                       ct.charset || self.class.default_charset)
    end

    class RackBody
      def initialize(response)
        @response = response
      end

      def each(*args, &block)
        @response.each(*args, &block)
      end

      def close
        # Rack "close" maps to Response#abort, and *not* Response#close
        # (which is used when the controller's finished writing)
        @response.abort
      end

      def body
        @response.body
      end

      def respond_to?(method, include_private = false)
        if method.to_s == "to_path"
          @response.stream.respond_to?(method)
        else
          super
        end
      end

      def to_path
        @response.stream.to_path
      end

      def to_ary
        nil
      end
    end

    def handle_no_content!
      if NO_CONTENT_CODES.include?(@status)
        @header.delete CONTENT_TYPE
        @header.delete "Content-Length"
      end
    end

    def rack_response(status, header)
      if NO_CONTENT_CODES.include?(status)
        [status, header, []]
      else
        [status, header, RackBody.new(self)]
      end
    end
  end
end