Class: Strobe::Middleware::Proxy

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

Defined Under Namespace

Classes: ProxyRequest

Constant Summary collapse

PROXY_PATH =
%r[/_strobe/proxy/([^/]+)(/.*)?$]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app, opts = {}) ⇒ Proxy

Returns a new instance of Proxy.


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# File 'lib/strobe/middleware/proxy.rb', line 86

def initialize(app, opts = {})
  @app, @opts = app, opts
end

Class Method Details

.parse_header_list(str) ⇒ Object


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# File 'lib/strobe/middleware/proxy.rb', line 61

def self.parse_header_list(str)
  return {} unless str
  parsed = {}

  str.downcase.split(',').each do |item|
    from, to, _ = item.split('=')
    to ||= from
    parsed[from.strip] = to.strip
  end

  parsed
end

.proxy_response?(status, hdrs) ⇒ Boolean

Returns:

  • (Boolean)

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# File 'lib/strobe/middleware/proxy.rb', line 8

def self.proxy_response?(status, hdrs)
  status == 302 && hdrs.any? { |k,v| k =~ /x-strobe-location/i }
end

.rackify(key) ⇒ Object


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# File 'lib/strobe/middleware/proxy.rb', line 74

def self.rackify(key)
  key = key.to_s.gsub('-', '_').upcase
  key = "HTTP_#{key}" unless %w(REQUEST_METHOD
                                CONTENT_LENGTH
                                QUERY_STRING
                                SERVER_NAME
                                SERVER_PORT
                                PATH_INFO
                                SCRIPT_NAME).include?(key)
  key
end

.redirect_env(is_head, hdrs, body, callback) ⇒ Object


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# File 'lib/strobe/middleware/proxy.rb', line 25

def self.redirect_env(is_head, hdrs, body, callback)
  env = {}

  parse_header_list(hdrs['x-strobe-forward-headers']).each do |from, to|
    env[rackify(to)] = hdrs[from]
  end

  env['REQUEST_METHOD']    = hdrs['x-strobe-redirect-method']
  env['REQUEST_METHOD']  ||= is_head ? 'HEAD' : 'GET'
  env['async.callback']    = callback

  # Rack::Request doesn't have join method
  body_str = ""
  body.each { |chunk| body_str << chunk }

  env['rack.input']        = StringIO.new(body_str)
  env
end

.redirect_opts(hdrs) ⇒ Object


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# File 'lib/strobe/middleware/proxy.rb', line 44

def self.redirect_opts(hdrs)
  extra_headers = {}
  block_headers = []

  parse_header_list(hdrs['x-strobe-add-headers']).each do |from, to|
    extra_headers[to] = hdrs[from]
  end

  parse_header_list(hdrs['x-strobe-block-headers']).each do |key, _|
    block_headers << key
  end

  { :extra_headers => extra_headers,
    :block_headers => block_headers,
    :block_cookies => true }
end

.strobe_redirect(is_head, _hdrs, body, callback) ⇒ Object


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# File 'lib/strobe/middleware/proxy.rb', line 12

def self.strobe_redirect(is_head, _hdrs, body, callback)
  hdrs = {}
  _hdrs.each { |k,v| hdrs[k.to_s.downcase] = v }

  location = hdrs['x-strobe-location']
  env      = redirect_env(is_head, hdrs, body, callback)
  options  = redirect_opts(hdrs)

  request  = ProxyRequest.new(env, location, options)

  request.handle!
end

Instance Method Details

#call(env) ⇒ Object


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# File 'lib/strobe/middleware/proxy.rb', line 90

def call(env)
  if env['PATH_INFO'] =~ PROXY_PATH
    p1, p2     = $1, $2
    scheme     = scheme_from_env(env)
    host, port = p1.split(':')
    path       = p2 || '/'
    port       = (port || (scheme == 'http' ? 80 : 443)).to_i

    url = "#{scheme}://#{host}"

    if port
      if (scheme == 'http' && port != 80) || (scheme == 'https' && port != 443)
        url << ":#{port}"
      end
    end

    url << path

    if !env['QUERY_STRING'].empty?
      url << "?#{env['QUERY_STRING']}"
    end

    request = ProxyRequest.new(env, url, @opts)
    request.handle!

    throw :async
  else
    @app.call(env)
  end
end

#scheme_from_env(env) ⇒ Object


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# File 'lib/strobe/middleware/proxy.rb', line 121

def scheme_from_env(env)
  env['HTTP_X_STROBE_PROXY_PROTOCOL'] || env['rack.url_scheme']
end