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require 'io/console'
module Net
module SSH
# Default prompt implementation, called for asking password from user.
# It will never be instantiated directly, but will instead be created for
# you automatically.
#
# A custom prompt objects can implement caching, or different UI. The prompt
# object should implemnted a start method, which should return something implementing
# ask and success. Net::SSH uses it like:
#
# prompter = options[:password_prompt].start({type:'password'})
# while !ok && max_retries < 3
# user = prompter.ask("user: ", {}, true)
# password = prompter.ask("password: ", {}, false)
# ok = send(user, password)
# prompter.sucess if ok
# end
#
class Prompt
# factory
def self.default(options = {})
@default ||= new(options)
end
def initialize(options = {}); end
# default prompt object implementation. More sophisticated implemenetations
# might implement caching.
class Prompter
def initialize(info)
if info[:type] == 'keyboard-interactive'
$stdout.puts(info[:name]) unless info[:name].empty?
$stdout.puts(info[:instruction]) unless info[:instruction].empty?
end
end
# ask input from user, a prompter might ask for multiple inputs
# (like user and password) in a single session.
def ask(prompt, echo=true)
$stdout.print(prompt)
$stdout.flush
ret = $stdin.noecho(&:gets).chomp
$stdout.print("\n")
ret
end
# success method will be called when the password was accepted
# It's a good time to save password asked to a cache.
def success; end
end
# start password session. Multiple questions might be asked multiple times
# on the returned object. Info hash tries to uniquely identify the password
# session, so caching implementations can save passwords properly.
def start(info)
Prompter.new(info)
end
end
end
end
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