Class: Middleman::Features::Proxy::Rack

Inherits:
Object
  • Object
show all
Defined in:
lib/middleman-proxy.rb

Overview

Rack application proxies requests as needed for the given project.

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Rack

Returns a new instance of Rack.



60
61
62
 
# File 'lib/middleman-proxy.rb', line 60

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



64
65
66
67
68
69
70
71
72
73
74
75
 
# File 'lib/middleman-proxy.rb', line 64

def call(env)
  url = env['PATH_INFO']

  @proxies = Middleman::Features::Proxy::Collection.proxies
  @proxies.each do |proxy, value|
    if url.match(/^#{Regexp.escape(proxy.to_s)}/)
      return handle_proxy(value, proxy.to_s, env)
    end
  end

  @app.call(env)
end

#handle_proxy(proxy, proxy_url, env) ⇒ Object 



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
 
# File 'lib/middleman-proxy.rb', line 77

def handle_proxy(proxy, proxy_url, env)
  if proxy[:secure] && !Middleman::HTTPS_ENABLED
    $stderr.puts "~ WARNING: HTTPS is not supported on your system, using HTTP instead.\n"
    $stderr.puts"    If you are using Ubuntu, you can run `apt-get install libopenssl-ruby`\n"
    proxy[:secure] = false
  end

  origin_host = env['SERVER_NAME'] # capture the origin host for cookies
  http_method = env['REQUEST_METHOD'].to_s.downcase
  url = env['PATH_INFO']
  params = env['QUERY_STRING']

  # collect headers...
  headers = {}
  env.each do |key, value|
    next unless key =~ /^HTTP_/
    key = key.gsub(/^HTTP_/,'').downcase.sub(/^\w/){|l| l.upcase}.gsub(/_(\w)/){|l| "-#{$1.upcase}"} # remove HTTP_, dasherize and titleize
    if !key.eql? "Version"
      headers[key] = value
    end
  end

  # Rack documentation says CONTENT_TYPE and CONTENT_LENGTH aren't prefixed by HTTP_
  headers['Content-Type'] = env['CONTENT_TYPE'] if env['CONTENT_TYPE']

  length = env['CONTENT_LENGTH']
  headers['Content-Length'] = length if length

  http_host, http_port = proxy[:to].split(':')
  http_port = proxy[:secure] ? '443' : '80' if http_port.nil?

  # added 4/23/09 per Charles Jolley, corrects problem
  # when making requests to virtual hosts
  headers['Host'] = "#{http_host}:#{http_port}"

  if proxy[:url]
    url = url.sub(/^#{Regexp.escape proxy_url}/, proxy[:url])
  end

  http_path = [url]
  http_path << params if params && params.size>0
  http_path = http_path.join('?')

  response = nil
  no_body_method = %w(get copy head move options trace)

  done = false
  tries = 0
  until done
    http = ::Net::HTTP.new(http_host, http_port)

    if proxy[:secure]
      http.use_ssl = true
      http.verify_mode = OpenSSL::SSL::VERIFY_NONE
    end

    http.start do |web|
      if no_body_method.include?(http_method)
        response = web.send(http_method, http_path, headers)
      else
        http_body = env['rack.input']
        http_body.rewind # May not be necessary but can't hurt

        req = Net::HTTPGenericRequest.new(http_method.upcase,
                                            true, true, http_path, headers)
        req.body_stream = http_body if length.to_i > 0
        response = web.request(req)
      end
    end

    status = response.code # http status code
    protocol = proxy[:secure] ? 'https' : 'http'

    $stderr.puts "~ PROXY: #{http_method.upcase} #{status} #{url} -> #{protocol}://#{http_host}:#{http_port}#{http_path}\n"

    # display and construct specific response headers
    response_headers = {}
    ignore_headers = ['transfer-encoding', 'keep-alive', 'connection']
    response.each do |key, value|
      next if ignore_headers.include?(key.downcase)
      # If this is a cookie, strip out the domain.  This technically may
      # break certain scenarios where services try to set cross-domain
      # cookies, but those services should not be doing that anyway...
      value.gsub!(/domain=[^\;]+\;? ?/,'') if key.downcase == 'set-cookie'
      # Location headers should rewrite the hostname if it is included.
      value.gsub!(/^http:\/\/#{http_host}(:[0-9]+)?\//, "http://#{http_host}/") if key.downcase == 'location'
      # content-length is returning char count not bytesize
      if key.downcase == 'content-length'
        if response.body.respond_to?(:bytesize)
          value = response.body.bytesize.to_s
        elsif response.body.respond_to?(:size)
          value = response.body.size.to_s
        else
          value = '0'
        end
      end

      $stderr << "   #{key}: #{value}\n"
      response_headers[key] = value
    end

    if [301, 302, 303, 307].include?(status.to_i) && proxy[:redirect] != false
      $stderr.puts '~ REDIRECTING: '+response_headers['location']+"\n"

      uri = URI.parse(response_headers['location']);
      http_host = uri.host
      http_port = uri.port
      http_path = uri.path
      http_path += '?'+uri.query if uri.query

      tries += 1
      if tries > 10
        raise "Too many redirects!"
      end
    else
      done = true
    end
  end

  # Thin doesn't like null bodies
  response_body = response.body || ''

  return [status, ::Rack::Utils::HeaderHash.new(response_headers), [response_body]]
end