summaryrefslogtreecommitdiff
path: root/tool/downloader.rb
blob: fcf456bd53559bee26f0851769bd6c20083f78e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
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
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
201
202
203
require 'open-uri'
begin
  require 'net/https'
  $rubygems_schema = 'https'

  # open-uri of ruby 2.2.0 accept an array of PEMs as ssl_ca_cert, but old
  # versions are not.  so, patching OpenSSL::X509::Store#add_file instead.
  class OpenSSL::X509::Store
    alias orig_add_file add_file
    def add_file(pems)
      Array(pems).each do |pem|
        if File.directory?(pem)
          add_path pem
        else
          orig_add_file pem
        end
      end
    end
  end
  # since open-uri internally checks ssl_ca_cert by File.directory?, to allow
  # accept an array.
  class <<File
    alias orig_directory? directory?
    def File.directory? files
      files.is_a?(Array) ? false : orig_directory?(files)
    end
  end
rescue LoadError
  $rubygems_schema = 'http'
end

class Downloader
  class GNU < self
    def self.download(name, *rest)
      super("http://gcc.gnu.org/git/?p=gcc.git;a=blob_plain;f=#{name};hb=master", name, *rest)
    end
  end

  class RubyGems < self
    def self.download(name, dir = nil, ims = true, options = {})
      require 'rubygems'
      require 'rubygems/package'
      options[:ssl_ca_cert] = Dir.glob(File.expand_path("../lib/rubygems/ssl_certs/*.pem", File.dirname(__FILE__)))
      if $rubygems_schema != 'https'
        warn "*** using http instead of https ***"
      end
      file = under(dir, name)
      super("#{$rubygems_schema}://rubygems.org/downloads/#{name}", file, nil, ims, options) or
        return false
      policy = Gem::Security::LowSecurity
      (policy = policy.dup).ui = Gem::SilentUI.new if policy.respond_to?(:'ui=')
      pkg = Gem::Package.new(file)
      pkg.security_policy = policy
      begin
        pkg.verify
      rescue Gem::Security::Exception => e
        $stderr.puts e.message
        File.unlink(file)
        false
      else
        true
      end
    end

    def self.verify(pkg)
    end
  end

  Gems = RubyGems

  class Unicode < self
    def self.download(name, *rest)
      super("http://www.unicode.org/Public/#{name}", name, *rest)
    end
  end

  def self.mode_for(data)
    /\A#!/ =~ data ? 0755 : 0644
  end

  def self.http_options(file, since)
    options = {}
    if since
      case since
      when true
        since = (File.mtime(file).httpdate rescue nil)
      when Time
        since = since.httpdate
      end
      if since
        options['If-Modified-Since'] = since
      end
    end
    options['Accept-Encoding'] = '*' # to deisable Net::HTTP::GenericRequest#decode_content
    options
  end

  # Downloader.download(url, name, [dir, [ims]])
  #
  # Update a file from url if newer version is available.
  # Creates the file if the file doesn't yet exist; however, the
  # directory where the file is being created has to exist already.
  # If +ims+ is false, always download url regardless of its last
  # modified time.
  #
  # Example usage:
  #   download 'http://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt',
  #            'UnicodeData.txt', 'enc/unicode/data'
  def self.download(url, name, dir = nil, ims = true, options = {})
    file = under(dir, name)
    if ims.nil? and File.exist?(file)
      if $VERBOSE
        $stdout.puts "#{name} already exists"
        $stdout.flush
      end
      return true
    end
    url = URI(url)
    if $VERBOSE
      $stdout.print "downloading #{name} ... "
      $stdout.flush
    end
    begin
      data = url.read(options.merge(http_options(file, ims.nil? ? true : ims)))
    rescue OpenURI::HTTPError => http_error
      if http_error.message =~ /^304 / # 304 Not Modified
        if $VERBOSE
          $stdout.puts "not modified"
          $stdout.flush
        end
        return true
      end
      raise
    rescue Timeout::Error
      if ims.nil? and File.exist?(file)
        puts "Request for #{url} timed out, using old version."
        return true
      end
      raise
    rescue SocketError
      if ims.nil? and File.exist?(file)
        puts "No network connection, unable to download #{url}, using old version."
        return true
      end
      raise
    end
    mtime = nil
    open(file, "wb", 0600) do |f|
      f.write(data)
      f.chmod(mode_for(data))
      mtime = data.meta["last-modified"]
    end
    if mtime
      mtime = Time.httpdate(mtime)
      File.utime(mtime, mtime, file)
    end
    if $VERBOSE
      $stdout.puts "done"
      $stdout.flush
    end
    true
  rescue => e
    raise "failed to download #{name}\n#{e.message}: #{url}"
  end

  def self.under(dir, name)
    dir ? File.join(dir, File.basename(name)) : name
  end
end

if $0 == __FILE__
  ims = true
  until ARGV.empty?
    case ARGV[0]
    when '-d'
      destdir = ARGV[1]
      ARGV.shift
    when '-e'
      ims = nil
    when '-a'
      ims = true
    when /\A-/
      abort "#{$0}: unknown option #{ARGV[0]}"
    else
      break
    end
    ARGV.shift
  end
  dl = Downloader.constants.find do |name|
    ARGV[0].casecmp(name.to_s) == 0
  end unless ARGV.empty?
  $VERBOSE = true
  if dl
    dl = Downloader.const_get(dl)
    ARGV.shift
    ARGV.each do |name|
      dl.download(name, destdir, ims)
    end
  else
    abort "usage: #{$0} url name" unless ARGV.size == 2
    Downloader.download(ARGV[0], ARGV[1], destdir, ims)
  end
end