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# encoding: utf-8
# Phusion Passenger - https://www.phusionpassenger.com/
# Copyright (c) 2013-2017 Phusion Holding B.V.
#
# "Passenger", "Phusion Passenger" and "Union Station" are registered
# trademarks of Phusion Holding B.V.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
PhusionPassenger.require_passenger_lib 'platform_info'
PhusionPassenger.require_passenger_lib 'utils/shellwords'
require 'fileutils'
module PhusionPassenger
module Utils
module Download
extend self # Make methods available as class methods.
def self.included(klass)
# When included into another class, make sure that Utils
# methods are made private.
public_instance_methods(false).each do |method_name|
klass.send(:private, method_name)
end
end
# Downloads a file from the given URL and saves it to the given filename.
# Returns whether the download succeeded.
#
# Options:
#
# show_progress: whether to show download progress. Default: false.
# logger: the logger to use. If not given, this function will log to STDERR.
# cacert: a CA certificate file to use for verifying SSL websites.
# The default is to use the download tool's down CA database.
# use_cache: Whether to copy the file from the download cache, if available.
# Default: false.
# connect_timeout: The maximum amount of time to spend on DNS lookup
# and establishing the TCP connection. Set to nil to
# disable this timeout. Default: 4.
# idle_timeout: The maximum idle read time. Set to nil to set this timeout
# to the default wget value, 900. Set to nil to disable this
# timeout. Default: 5.
# total_timeout: The maximum amount of time spent on the whole download
# operation, including connection time. Only has effect on curl.
# Set to nil to disable this timeout. Default: nil.
def download(url, output, options = {})
options = {
:connect_timeout => 4,
:idle_timeout => 5
}.merge(options)
logger = options[:logger] || Logger.new(STDERR)
if options[:use_cache] && cache_dir = PhusionPassenger.download_cache_dir
basename = basename_from_url(url)
if File.exist?("#{cache_dir}/#{basename}")
logger.info "Copying #{basename} from #{cache_dir}..."
FileUtils.cp("#{cache_dir}/#{basename}", output)
return true
end
end
if PlatformInfo.find_command("curl")
return download_with_curl(logger, url, output, options)
elsif PlatformInfo.find_command("wget")
return download_with_wget(logger, url, output, options)
else
logger.error "Could not download #{url}: no download tool found (curl or wget required)"
return false
end
end
private
def basename_from_url(url)
return url.sub(/.*\//, '')
end
def download_with_curl(logger, url, output, options)
command = ["curl", "-f", "-L", "-o", output]
if options[:show_progress]
command << "-#"
else
command << "-s"
command << "-S"
end
if options[:cacert]
command << "--cacert"
command << options[:cacert]
end
if options[:connect_timeout]
command << "--connect-timeout"
command << options[:connect_timeout].to_s
end
if options[:idle_timeout]
command << "--speed-time"
command << options[:idle_timeout].to_s
command << "--speed-limit"
command << "1"
end
if options[:total_timeout]
command << "--max-time"
command << options[:total_timeout].to_s
end
command << url
command_str = Shellwords.join(command)
logger.info("Invoking: #{command_str}")
if options[:show_progress]
# If curl errors out we don't want it to display 'curl: ' prefixes,
# so we parse its output.
begin
io = IO.popen("#{command_str} 2>&1", "r")
rescue SystemCallError => e
logger.error("Could not invoke curl: #{e}")
return false
end
begin
non_empty_line_encountered = false
while !io.eof?
# We split on "\r" because progress bar lines do not contain "\n".
data = io.gets("\r")
data = remove_curl_output_prefix(data)
# If an error occurs then the first few lines may be empty.
# Skip those.
if !non_empty_line_encountered && data =~ /\A\n+/
data.gsub!(/\A\n+/, '')
end
non_empty_line_encountered = true
STDERR.write(data)
STDERR.flush
end
ensure
io.close
end
result = $?.exitstatus == 0
else
begin
output = `#{command_str} 2>&1`
rescue SystemCallError => e
logger.error("Could not invoke curl: #{e}")
return false
end
result = $?.exitstatus == 0
if !result
output = remove_curl_output_prefix(output)
output.chomp!
logger.error("Could not download #{url}: #{output}")
end
end
return result
end
def remove_curl_output_prefix(line)
return line.gsub(/^curl: (\([0-9]+\) )?/, '')
end
def download_with_wget(logger, url, output, options)
command = ["wget", "--tries=1", "-O", output]
if !options[:show_progress]
command << "-nv"
end
if options[:cacert]
command << "--ca-certificate=#{options[:cacert]}"
end
if options[:connect_timeout]
command << "--dns-timeout=#{options[:connect_timeout]}"
command << "--connect-timeout=#{options[:connect_timeout]}"
end
if options[:idle_timeout]
command << "--timeout=#{options[:idle_timeout]}"
end
command << url
command_str = Shellwords.join(command)
logger.info("Invoking: #{command_str}")
if options[:show_progress]
begin
result = system(*command)
rescue SystemCallError => e
logger.error("Could not invoke wget: #{e}")
return false
end
if !result
logger.error("Could not download #{url}: #{output}")
end
else
begin
output = `#{command_str} 2>&1`
rescue SystemCallError => e
logger.error("Could not invoke wget: #{e}")
return false
end
result = $?.exitstatus == 0
if !result
# Error output may begin with "<URL>:\n" which is redundant.
output.gsub!(/\A#{Regexp.escape url}:\n/, '')
output.chomp!
logger.error("Could not download #{url}: #{output}")
end
end
return result
end
end
end # module Utils
end # module PhusionPassenger
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