#!/usr/bin/env ruby
#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++


require 'test/unit'
require 'zlib'
require 'webrick'
require 'rubygems/remote_fetcher'

require 'test/gemutilities'
require 'test/mockgemui'
require 'test/yaml_data'

Gem.manage_gems
include WEBrick

# = Testing Proxy Settings
#
# These tests check the proper proxy server settings by running two
# web servers.  The web server at http://localhost:#{SERVER_PORT}
# represents the normal gem server and returns a gemspec with a rake
# version of 0.4.11.  The web server at http://localhost:#{PROXY_PORT}
# represents the proxy server and returns a different dataset where
# rake has version 0.4.2.  This allows us to detect which server is
# returning the data.
#
# Note that the proxy server is not a *real* proxy server.  But our
# software doesn't really care, as long as we hit the proxy URL when a
# proxy is configured.
#
class TestRemoteFetcher < RubyGemTestCase

  include Gem::DefaultUserInteraction

  SERVER_DATA = YAML_DATA
  
  PROXY_PORT = 12344
  SERVER_PORT = 12345

  def setup
    super
    self.class.start_servers
    self.class.enable_yaml = true
    self.class.enable_zip = false
    ENV['http_proxy'] = nil
    ENV['HTTP_PROXY'] = nil
    ENV['http_proxy_user'] = nil
    ENV['HTTP_PROXY_USER'] = nil
    ENV['http_proxy_pass'] = nil
    ENV['HTTP_PROXY_PASS'] = nil

    base_server_uri = "http://localhost:#{SERVER_PORT}"
    @proxy_uri = "http://localhost:#{PROXY_PORT}"

    @server_uri = base_server_uri + "/yaml"
    @server_z_uri = base_server_uri + "/yaml.Z"

    Gem::RemoteFetcher.instance_variable_set :@fetcher, nil
  end

  def test_self_fetcher
    fetcher = Gem::RemoteFetcher.fetcher
    assert_not_nil fetcher
    assert_kind_of Gem::RemoteFetcher, fetcher
  end

  def test_self_fetcher_with_proxy
    proxy_uri = 'http://proxy.example.com'
    Gem.configuration[:http_proxy] = proxy_uri
    fetcher = Gem::RemoteFetcher.fetcher
    assert_not_nil fetcher
    assert_kind_of Gem::RemoteFetcher, fetcher
    assert_equal proxy_uri, fetcher.instance_variable_get(:@proxy_uri).to_s
  end

  def test_fetch_size_bad_uri
    fetcher = Gem::RemoteFetcher.new nil

    e = assert_raise ArgumentError do
      fetcher.fetch_size 'gems.example.com/yaml'
    end

    assert_equal 'uri is not an HTTP URI', e.message
  end

  def test_fetch_size_socket_error
    fetcher = Gem::RemoteFetcher.new nil
    def fetcher.connect_to(host, port)
      raise SocketError
    end

    e = assert_raise Gem::RemoteFetcher::FetchError do
      fetcher.fetch_size 'http://gems.example.com/yaml'
    end

    assert_equal 'SocketError(SocketError)', e.message
  end

  def test_no_proxy
    use_ui(MockGemUi.new) do
      fetcher = Gem::RemoteFetcher.new nil
      assert_data_from_server fetcher.fetch_path(@server_uri)
      assert_equal SERVER_DATA.size, fetcher.fetch_size(@server_uri)
    end
  end
  
  def test_explicit_proxy
    use_ui(MockGemUi.new) do
      fetcher = Gem::RemoteFetcher.new @proxy_uri
      assert_equal PROXY_DATA.size, fetcher.fetch_size(@server_uri)
      assert_data_from_proxy fetcher.fetch_path(@server_uri)
    end
  end
  
  def test_explicit_proxy_with_user_auth
    use_ui(MockGemUi.new) do
      uri = URI.parse @proxy_uri
      uri.user, uri.password = 'foo', 'bar'
      fetcher = Gem::RemoteFetcher.new uri.to_s
      proxy = fetcher.instance_variable_get("@proxy_uri")
      assert_equal 'foo', proxy.user
      assert_equal 'bar', proxy.password
      assert_data_from_proxy fetcher.fetch_path(@server_uri)
    end

    use_ui(MockGemUi.new) do
      uri = URI.parse @proxy_uri
      uri.user, uri.password = 'domain%5Cuser', 'bar'
      fetcher = Gem::RemoteFetcher.new uri.to_s
      proxy = fetcher.instance_variable_get("@proxy_uri")
      assert_equal 'domain\user', URI.unescape(proxy.user)
      assert_equal 'bar', proxy.password
      assert_data_from_proxy fetcher.fetch_path(@server_uri)
    end

    use_ui(MockGemUi.new) do
      uri = URI.parse @proxy_uri
      uri.user, uri.password = 'user', 'my%20pass'
      fetcher = Gem::RemoteFetcher.new uri.to_s
      proxy = fetcher.instance_variable_get("@proxy_uri")
      assert_equal 'user', proxy.user
      assert_equal 'my pass', URI.unescape(proxy.password)
      assert_data_from_proxy fetcher.fetch_path(@server_uri)
    end
  end

  def test_explicit_proxy_with_user_auth_in_env
    use_ui(MockGemUi.new) do
      ENV['http_proxy'] = @proxy_uri
      ENV['http_proxy_user'] = 'foo'
      ENV['http_proxy_pass'] = 'bar'
      fetcher = Gem::RemoteFetcher.new nil
      proxy = fetcher.instance_variable_get("@proxy_uri")
      assert_equal 'foo', proxy.user
      assert_equal 'bar', proxy.password
      assert_data_from_proxy fetcher.fetch_path(@server_uri)
    end

    use_ui(MockGemUi.new) do
      ENV['http_proxy'] = @proxy_uri
      ENV['http_proxy_user'] = 'foo\user'
      ENV['http_proxy_pass'] = 'my bar'
      fetcher = Gem::RemoteFetcher.new nil
      proxy = fetcher.instance_variable_get("@proxy_uri")
      assert_equal 'foo\user', URI.unescape(proxy.user)
      assert_equal 'my bar', URI.unescape(proxy.password)
      assert_data_from_proxy fetcher.fetch_path(@server_uri)
    end
  end

  def test_fetch_path_io_error
    fetcher = Gem::RemoteFetcher.new nil

    def fetcher.open_uri_or_path(uri) raise EOFError; end

    e = assert_raise Gem::RemoteFetcher::FetchError do
      fetcher.fetch_path 'uri'
    end

    assert_equal 'EOFError reading uri', e.message
  end

  def test_fetch_path_socket_error
    fetcher = Gem::RemoteFetcher.new nil

    def fetcher.open_uri_or_path(uri) raise SocketError; end

    e = assert_raise Gem::RemoteFetcher::FetchError do
      fetcher.fetch_path 'uri'
    end

    assert_equal 'SocketError reading uri', e.message
  end

  def test_fetch_path_system_call_error
    fetcher = Gem::RemoteFetcher.new nil

    def fetcher.open_uri_or_path(uri);
      raise Errno::ECONNREFUSED, 'connect(2)'
    end

    e = assert_raise Gem::RemoteFetcher::FetchError do
      fetcher.fetch_path 'uri'
    end

    assert_equal 'Errno::ECONNREFUSED reading uri', e.message
  end

  def test_implicit_no_proxy
    use_ui(MockGemUi.new) do
      ENV['http_proxy'] = 'http://fakeurl:12345'
      fetcher = Gem::RemoteFetcher.new :no_proxy
      assert_data_from_server fetcher.fetch_path(@server_uri)
    end
  end

  def test_implicit_proxy
    use_ui(MockGemUi.new) do
      ENV['http_proxy'] = @proxy_uri
      fetcher = Gem::RemoteFetcher.new nil
      assert_data_from_proxy fetcher.fetch_path(@server_uri)
    end
  end
  
  def test_implicit_upper_case_proxy
    use_ui(MockGemUi.new) do
      ENV['HTTP_PROXY'] = @proxy_uri
      fetcher = Gem::RemoteFetcher.new nil
      assert_data_from_proxy fetcher.fetch_path(@server_uri)
    end
  end
  
  def test_implicit_proxy_no_env
    use_ui(MockGemUi.new) do
      fetcher = Gem::RemoteFetcher.new nil
      assert_data_from_server fetcher.fetch_path(@server_uri)
    end
  end
  
  def test_zip
    use_ui(MockGemUi.new) do
      self.class.enable_zip = true
      fetcher = Gem::RemoteFetcher.new nil
      assert_equal SERVER_DATA.size, fetcher.fetch_size(@server_uri), "probably not from proxy"
      zip_data = fetcher.fetch_path(@server_z_uri)
      assert zip_data.size < SERVER_DATA.size, "Zipped data should be smaller"
    end
  end

  def test_no_zip
    use_ui(MockGemUi.new) do
      fetcher = Gem::RemoteFetcher.new nil
      assert_error { fetcher.fetch_path(@server_z_uri) }
    end
  end

  def test_yaml_error_on_size
    use_ui(MockGemUi.new) do
      self.class.enable_yaml = false
      fetcher = Gem::RemoteFetcher.new nil
      assert_error { fetcher.size }
    end
  end

  private

  def assert_error(exception_class=Exception)
    got_exception = false
    begin
      yield
    rescue exception_class => ex
      got_exception = true
    end
    assert got_exception, "Expected exception conforming to #{exception_class}" 
  end

  def assert_data_from_server(data)
    assert_block("Data is not from server") { data =~ /0\.4\.11/ }
  end
    
  def assert_data_from_proxy(data)
    assert_block("Data is not from proxy") { data =~ /0\.4\.2/ }
  end
    
  class NilLog < Log
    def log(level, data) #Do nothing
    end
  end
  
  class << self
    attr_reader :normal_server, :proxy_server
    attr_accessor :enable_zip, :enable_yaml
    
    def start_servers
      @normal_server ||= start_server(SERVER_PORT, SERVER_DATA)
      @proxy_server  ||= start_server(PROXY_PORT, PROXY_DATA)
      @enable_yaml = true
      @enable_zip = false
    end
    
    private
    
    def start_server(port, data)
      Thread.new do
        begin
          null_logger = NilLog.new
          s = HTTPServer.new(
            :Port            => port,
            :DocumentRoot    => nil,
            :Logger          => null_logger,
            :AccessLog       => null_logger
            )
          s.mount_proc("/kill") { |req, res| s.shutdown }
          s.mount_proc("/yaml") { |req, res|
            if @enable_yaml
              res.body = data
              res['Content-Type'] = 'text/plain'
              res['content-length'] = data.size
            else
              res.code = "404"
              res.body = "<h1>NOT FOUND</h1>"
              res['Content-Type'] = 'text/html'
            end
          }
          s.mount_proc("/yaml.Z") { |req, res|
            if @enable_zip
              res.body = Zlib::Deflate.deflate(data)
              res['Content-Type'] = 'text/plain'
            else
              res.code = "404"
              res.body = "<h1>NOT FOUND</h1>"
              res['Content-Type'] = 'text/html'
            end
          }
          s.start
        rescue Exception => ex
          puts "ERROR during server thread: #{ex.message}"
        end
      end
      sleep 0.2                 # Give the servers time to startup
    end
  end
  
end