Class: Strobe::Middleware::Proxy::ProxyRequest

Inherits:
Object
  • Object
show all
Defined in:
lib/strobe/middleware/proxy.rb

Defined Under Namespace

Classes: DeferrableBody

Constant Summary collapse

KEEP = 
[ 'CONTENT_LENGTH', 'CONTENT_TYPE' ]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(env, url, opts = {}) ⇒ ProxyRequest

Returns a new instance of ProxyRequest.



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# File 'lib/strobe/middleware/proxy.rb', line 167

def initialize(env, url, opts = {})
  @env  = env
  @url  = url
  @opts = opts

  # STATE options
  @http      = nil
  @body      = nil
  @redirect  = false
  @responded = false
end

Instance Attribute Details

#response_headers ⇒ Object (readonly)

Returns the value of attribute response_headers.



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# File 'lib/strobe/middleware/proxy.rb', line 165

def response_headers
  @response_headers
end

#url ⇒ Object (readonly)

Returns the value of attribute url.



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# File 'lib/strobe/middleware/proxy.rb', line 165

def url
  @url
end

Class Method Details

.x_strobe_proxy(url, env, opts) ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 128

def self.x_strobe_proxy(url, env, opts)
  request = ProxyRequest.new(env, url, opts)

  request.handle!

  throw :async
end

Instance Method Details

#block_cookies? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/strobe/middleware/proxy.rb', line 358

def block_cookies?
  @opts[:block_cookies]
end

#block_headers ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 362

def block_headers
  @opts[:block_headers] || []
end

#chunked_response_body? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/strobe/middleware/proxy.rb', line 299

def chunked_response_body?
  has_response_body? && response_headers['Transfer-Encoding'] &&
    response_headers['Transfer-Encoding'].downcase == 'chunked'
end

#extra_headers ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 366

def extra_headers
  @opts[:extra_headers] || {}
end

#handle! ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 179

def handle!
  EM.next_tick do
    begin
      conn = EM::HttpRequest.new(url, {:ssl => { :verify_peer => false }})

      @http = case request_method
      when 'GET'    then conn.get    request_options
      when 'POST'   then conn.post   request_options
      when 'PUT'    then conn.put    request_options
      when 'DELETE' then conn.delete request_options
      when 'HEAD'   then conn.head   request_options
      else raise "Unknown HTTP method '#{request_method}'"
      end

      @http.headers  { |hdrs| handle_headers(hdrs) }
      @http.stream   { |data| handle_chunk(data)   }
      @http.callback { handle_done  }
      @http.errback  { handle_error }
    end
  end
end

#handle_chunk(chunk) ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 265

def handle_chunk(chunk)
  return if redirect?
  @body.call(chunk) if @body
end

#handle_cookies(value) ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 231

def handle_cookies(value)
  cookies = []
  uri = URI.parse(url)

  case value
  when Array then value.each { |c| cookies << c }
  when Hash  then value.each { |_, c| cookies << c }
  else            cookies << value
  end

  result = cookies.flatten.join(",").split(/,(?=[^;,]*=)|,$/).map do |cookie|
    parts = cookie.split(/;+/).map!(&:strip)

    # delete domain and extract path from the cookie
    parts.delete_if { |p| p.start_with?("domain=") }
    path_part = parts.find { |p| p.start_with?("path=") }.tap { |p| parts.delete(p) }

    if (uri.scheme == "http" && uri.port != 80) || (uri.scheme == "https" && uri.port != 443)
      domain = "#{uri.host}:#{uri.port}"
    else
      domain = uri.host
    end

    path = path_part.to_s.split("=", 2)[1] || "/"

    # add a new path
    parts << "path=/_strobe/proxy/#{domain.sub(/^[.]/, "")}#{path.sub(/\/$/, "")}"

    parts.join("; ")
  end

  result.join(", ")
end

#handle_done ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 270

def handle_done
  if has_response_body? && @body
    @body.call ['']
    @body.succeed
  end
end

#handle_error ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 277

def handle_error
  unless @responded
    status  = @http.response_header.status
    headers = { "Connection" => "close", "Content-Length" => "0" }
    respond(status, headers, "")
  end
end

#handle_headers(hdrs) ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 201

def handle_headers(hdrs)
  headers = {}

  hdrs.each do |key, value|
    key = headerize(key)
    if key == "Set-Cookie"
      headers["Set-Cookie"] = handle_cookies(value)
    else
      headers[key] = value
    end
  end

  # Let's simplify things by always chunking the response
  # Also, responses will never be compressed
  headers.delete("Content-Length")
  headers.delete("Content-Encoding")
  headers['Transfer-Encoding'] = 'chunked'

  @redirect = headers['Location'] && @http.req.follow_redirect?

  unless @redirect
    h = {}
    headers.each { |k,v| h[k] = v if !block_headers.include?(k.downcase) }
    headers = h.merge(extra_headers)
    @response_headers = ::Rack::Utils::HeaderHash.new(headers)
    @body = DeferrableBody.new(self) if has_response_body?
    respond(@http.response_header.status, @response_headers)
  end
end

#has_request_body? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/strobe/middleware/proxy.rb', line 339

def has_request_body?
  @env['CONTENT_LENGTH'] || @env['HTTP_TRANSFER_ENCODING']
end

#has_response_body? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/strobe/middleware/proxy.rb', line 294

def has_response_body?
  status = @http.response_header.status
  status >= 200 && status != 204 && status != 304
end

#headerize(str) ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 353

def headerize(str)
  parts = str.gsub(/^HTTP_/, '').split('_')
  parts.map! { |p| p.downcase.capitalize }.join('-')
end

#redirect? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/strobe/middleware/proxy.rb', line 290

def redirect?
  @redirect
end

#request_body ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 327

def request_body
  return unless has_request_body?
  return @request_body if @request_body
  @request_body = @env['rack.input'].read
  @env['rack.input'].rewind
  @request_body
end

#request_headers ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 308

def request_headers
  return @request_headers if @request_headers
  @request_headers = {}
  @env.each do |key, value|
    next unless key.is_a?(String)
    next if     key =~ /^HTTP_(HOST|VERSION|X_STROBE_PROXY_PROTOCOL)$/i
    next unless key =~ /^HTTP_/ || KEEP.include?(key)

    key = headerize(key)
    @request_headers[key] = value
  end

  if requires_request_body? && !has_request_body?
    @request_headers['Content-Length'] = '0'
  end

  @request_headers
end

#request_method ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 304

def request_method
  @env['REQUEST_METHOD'].upcase
end

#request_options ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 343

def request_options
  return @request_options if @request_options
  @request_options = {}
  @request_options[:head]      = request_headers
  @request_options[:body]      = request_body if has_request_body?
  @request_options[:timeout]   = 60
  @request_options[:redirects] = 10
  @request_options
end

#requires_request_body? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/strobe/middleware/proxy.rb', line 335

def requires_request_body?
  ['POST', 'PUT'].include?(@env['REQUEST_METHOD'])
end

#respond(status, hdrs, body = @body) ⇒ Object 



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# File 'lib/strobe/middleware/proxy.rb', line 285

def respond(status, hdrs, body = @body)
  @responded = true
  @env['async.callback'].call([status, hdrs, body || ['']])
end