Class: Wunderbar::CGI

Inherits:
Object
  • Object
show all
Defined in:
lib/wunderbar/script.rb,
lib/wunderbar/polymer.rb,
lib/wunderbar/cgi-methods.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.call(scope) ⇒ Object



115
116
117
# File 'lib/wunderbar/cgi-methods.rb', line 115

def self.call(scope)
  new.call(scope)
end

.headers(headers) ⇒ Object

map Ruby CGI headers to Rack headers



200
201
202
203
204
205
206
207
# File 'lib/wunderbar/cgi-methods.rb', line 200

def self.headers(headers)
  result = headers.dup
  type = result.delete('type') || 'text/html'
  charset = result.delete('charset')
  type = "#{type}; charset=#{charset}" if charset
  result['Content-Type'] ||= type
  result
end

Instance Method Details

#call(scope) ⇒ Object



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
# File 'lib/wunderbar/cgi-methods.rb', line 119

def call(scope)
  # asset support for Rack
  request = (scope.respond_to? :request) ? scope.request : nil
  if request and request.path =~ %r{/assets/\w[-.\w]+}
    path = '.' + scope.request.path
    headers = {'type' => 'text/plain'}
    headers['type'] = 'application/javascript' if path =~ /\.js$/
    out?(scope, headers) { File.read path if File.exist? path }
    return
  end

  env = scope.env
  accept    = env['HTTP_ACCEPT'].to_s
  path_info = env['PATH_INFO'].to_s

  # implied request types
  text = Wunderbar::Options::TEXT || (accept =~ /plain/ && accept !~ /html/)
  xhr_json = Wunderbar::Options::XHR_JSON || (accept =~ /json/)
  xhr_json ||= !text && env['HTTP_X_REQUESTED_WITH'].to_s=='XMLHttpRequest'
  @xhtml = (accept =~ /xhtml/ or accept == '')
  @pdf   = (accept =~ /pdf/)

  # parse json arguments
  if xhr_json and request and request.respond_to? :body
    if env['CONTENT_TYPE'] =~ %r{^application/json(;.*)?$}
      scope.params.merge! JSON.parse(scope.request.body.read)
    end
  end

  # overrides via the command line
  xhtml_override = ARGV.include?('--xhtml')
  html_override  = ARGV.include?('--html')
  @pdf           ||= ARGV.include?('--pdf')

  # overrides via the uri query parameter
  # xhr_json       ||= (path_info.end_with? '.json')
  text           ||= (path_info.end_with? '.text')
  @pdf           ||= (path_info.end_with? '.pdf')
  xhtml_override ||= (path_info.end_with? '.xhtml')
  html_override  ||= (path_info.end_with? '.html')

  # disable conneg if only one handler is provided
  if Wunderbar.queue.length == 1
    htype = Wunderbar.queue.first.first
    xhr_json = (htype == :json)
    text     = (htype == :text)
  end

  Wunderbar.queue.each do |type, args, block|
    case type
    when :html, :xhtml
      unless xhr_json or text
        if type == :html
          @xhtml = false unless xhtml_override
        else
          @xhtml = false if html_override
        end

        self.html(scope, *args, &block)
        return
      end
    when :json
      if xhr_json
        self.json(scope, *args, &block)
        return
      end
    when :text
      if text
        self.text(scope, *args, &block)
        return
      end
    when Proc
      unless xhr_json or text
        instance_exec scope, args, block, &type
        return
      end
    end
  end
end

#html(scope, *args, &block) ⇒ Object

produce html/xhtml



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
# File 'lib/wunderbar/cgi-methods.rb', line 89

def html(scope, *args, &block)
  headers = { 'type' => 'text/html', 'charset' => 'UTF-8' }
  headers['type'] = 'application/xhtml+xml' if @xhtml

  x = HtmlMarkup.new(scope)

  begin
    if @pdf
      x._.pdf = true if @pdf
      headers = { 'type' => 'application/pdf' }
      output = html2pdf {x.html(*args, &block)}
    else
      output = x.html(*args, &block)
    end
  rescue ::Exception => exception
    headers['status'] = Wunderbar::ServerError.text
    x.clear!
    output = x.html(*args) do
      _h1 'Internal Server Error'
      _exception exception
    end
  end

  out?(scope, headers) { output }
end

#html2pdf(input = nil, &block) ⇒ Object



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
# File 'lib/wunderbar/cgi-methods.rb', line 53

def html2pdf(input=nil, &block)
  require 'thread'
  require 'open3'
  require 'stringio'

  display=":#{rand(999)+1}"
  pid = fork do
    # close open files
    STDIN.reopen '/dev/null'
    STDOUT.reopen '/dev/null', 'a'
    STDERR.reopen STDOUT

    Process.setsid
    Wunderbar.error Process.exec("Xvfb #{display}")
    Process.exit
  end
  Process.detach(pid)

  ENV['DISPLAY']=display
  input ||= block.call
  output = StringIO.new

  Open3.popen3('wkhtmltopdf - -') do |pin, pout, perr|
    [
      Thread.new { pin.write input; pin.close },
      Thread.new { IO.copy_stream(pout, output) },
      Thread.new { perr.readpartial(4096) until perr.eof? }
    ].map(&:join)
  end

  output.string
ensure
  Process.kill 'INT', pid rescue nil
end

#json(scope, &block) ⇒ Object

produce json



7
8
9
10
11
12
13
14
15
16
17
18
19
# File 'lib/wunderbar/cgi-methods.rb', line 7

def json(scope, &block)
  headers = { 'type' => 'application/json', 'charset' => 'UTF-8',
    'Cache-Control' => 'no-cache' }
  builder = JsonBuilder.new(scope)
  output = builder.encode(&block)
  headers['status'] = "404 Not Found" if output == {}
rescue Exception => exception
  headers['status'] = Wunderbar::ServerError.text
  builder._! Hash.new unless builder.target? Hash
  builder._exception exception
ensure
  out?(scope, headers) { builder.target! }
end

#out?(scope, headers, &block) ⇒ Boolean

Conditionally provide output, based on ETAG

Returns:

  • (Boolean)


35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
# File 'lib/wunderbar/cgi-methods.rb', line 35

def out?(scope, headers, &block)
  content = block.call
  etag = Digest::MD5.hexdigest(content)

  if scope.env['HTTP_IF_NONE_MATCH'] == etag.inspect
    headers['Date'] = ::CGI.rfc1123_date(Time.now)
    scope.out headers.merge('status' => '304 Not Modified') do
      ''
    end
  else
    scope.out headers.merge('Etag' => etag.inspect) do
      content
    end
  end
rescue Exception => exception
  Wunderbar.fatal exception.inspect
end

#polymer_element(scope, *args, &block) ⇒ Object



24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
# File 'lib/wunderbar/polymer.rb', line 24

def polymer_element(scope, *args, &block)
  headers = { 'type' => 'text/html', 'charset' => 'UTF-8' }
  x = HtmlMarkup.new(scope)

  begin
     element = x._polymer_element *args do
      x.instance_eval(&block)
    end
    output = element.serialize.join("\n") + "\n"
  rescue ::Exception => exception
    headers['status'] = Wunderbar::ServerError.text
    x.clear!
    output = x.html(*args) do
      _h1 'Internal Server Error'
      _exception exception
    end
  end

  out?(scope, headers) { output }
end

#ruby2js(scope, *args, &block) ⇒ Object



56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
# File 'lib/wunderbar/script.rb', line 56

def ruby2js(scope, *args, &block)
  headers = { 'type' => 'application/javascript', 'charset' => 'UTF-8' }

  begin
    output = Ruby2JS.convert(block) + "\n"
  rescue Parser::SyntaxError => exception
    headers['status'] = Wunderbar::ServerError.text
    location = exception.diagnostic.location
    output = "// Syntax Error: line #{location.line}, " +
      "column: #{location.column}\n#{exception}\n"
  rescue ::Exception => exception
    headers['status'] = Wunderbar::ServerError.text
    output = "// Internal Server Error: #{exception}\n"
    exception.backtrace.each do |frame| 
      next if CALLERS_TO_IGNORE.any? {|re| frame =~ re}
      output += "  #{frame}\n"
    end
  end

  out?(scope, headers) { output }
end

#text(scope, &block) ⇒ Object

produce text



22
23
24
25
26
27
28
29
30
31
32
# File 'lib/wunderbar/cgi-methods.rb', line 22

def text(scope, &block)
  headers = {'type' => 'text/plain', 'charset' => 'UTF-8'}
  builder = TextBuilder.new(scope)
  output = builder.encode(&block)
  headers['status'] = "404 Not Found" if output == ''
rescue Exception => exception
  headers['status'] = Wunderbar::ServerError.text
  builder._exception exception
ensure
  out?(scope, headers) { builder.target! }
end