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#
# Chef::Mixin::ParamsValidate
#
# Because I can't deal with not having named params. Strongly based on Dave Rolsky's excellent
# Params::Validate module for Perl. Please don't blame him, though, if you hate this. :)
#
# Author:: Adam Jacob (<adam@hjksolutions.com>)
# Copyright:: Copyright (c) 2008 HJK Solutions, LLC
# License:: GNU General Public License version 2 or later
#
# This program and entire repository is free software; you can
# redistribute it and/or modify it under the terms of the GNU
# General Public License as published by the Free Software
# Foundation; either version 2 of the License, or any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
class Chef
module Mixin
module ParamsValidate
# Takes a hash of options, along with a map to validate them. Returns the original
# options hash, plus any changes that might have been made (through things like setting
# default values in the validation map)
#
# For example:
#
# validate({ :one => "neat" }, { :one => { :kind_of => String }})
#
# Would raise an exception if the value of :one above is not a kind_of? string. Valid
# map options are:
#
# :default:: Sets the default value for this parameter.
# :callbacks:: Takes a hash of Procs, which should return true if the argument is valid.
# The key will be inserted into the error message if the Proc does not return true:
# "Option #{key}'s value #{value} #{message}!"
# :kind_of:: Ensure that the value is a kind_of?(Whatever)
# :respond_to:: Esnure that the value has a given method. Takes one method name or an array of
# method names.
# :required:: Raise an exception if this parameter is missing. Valid values are true or false,
# by default, options are not required.
# :regex:: Match the value of the paramater against a regular expression.
def validate(opts, map)
#--
# validate works by taking the keys in the validation map, assuming it's a hash, and
# looking for _pv_:symbol as methods. Assuming it find them, it calls the right
# one.
#++
raise ArgumentError, "Options must be a hash" unless opts.kind_of?(Hash)
raise ArgumentError, "Validation Map must be a hash" unless map.kind_of?(Hash)
map.each do |key, validation|
unless key.kind_of?(Symbol) || key.kind_of?(String)
raise ArgumentError, "Validation map keys must be symbols or strings!"
end
case validation
when true
_pv_required(opts, key)
when false
true
when Hash
validation.each do |check, carg|
check_method = "_pv_#{check.to_s}"
if self.respond_to?(check_method, true)
self.send(check_method, opts, key, carg)
else
raise ArgumentError, "Validation map has unknown check: #{check}"
end
end
end
end
opts
end
private
# Return the value of a parameter, or nil if it doesn't exist.
def _pv_opts_lookup(opts, key)
if opts.has_key?(key.to_s)
opts[key.to_s]
elsif opts.has_key?(key.to_sym)
opts[key.to_sym]
else
nil
end
end
# Raise an exception if the parameter is not found.
def _pv_required(opts, key, is_required=true)
if is_required
if opts.has_key?(key.to_s) || opts.has_key?(key.to_sym)
true
else
raise ArgumentError, "Required argument #{key} is missing!"
end
end
end
# Raise an exception if the parameter is not a kind_of?(to_be)
def _pv_kind_of(opts, key, to_be)
value = _pv_opts_lookup(opts, key)
if value != nil
unless value.kind_of?(to_be)
raise ArgumentError, "Option #{key} must be a kind of #{to_be}! You passed #{to_be.inspect}."
end
end
end
# Raise an exception if the parameter does not respond to a given set of methods.
def _pv_respond_to(opts, key, method_name_list)
value = _pv_opts_lookup(opts, key)
if value != nil
method_name_list.to_a.each do |method_name|
unless value.respond_to?(method_name)
raise ArgumentError, "Option #{key} must have a #{method_name} method!"
end
end
end
end
# Assign a default value to a parameter.
def _pv_default(opts, key, default_value)
value = _pv_opts_lookup(opts, key)
if value == nil
opts[key] = default_value
end
end
# Check a parameter against a regular expression.
def _pv_regex(opts, key, regex)
value = _pv_opts_lookup(opts, key)
if value != nil
if regex.match(value) == nil
raise ArgumentError, "Option #{key}'s value #{value} does not match regular expression #{regex.to_s}"
end
end
end
# Check a parameter against a hash of proc's.
def _pv_callbacks(opts, key, callbacks)
raise ArgumentError, "Callback list must be a hash!" unless callbacks.kind_of?(Hash)
value = _pv_opts_lookup(opts, key)
if value != nil
callbacks.each do |message, zeproc|
if zeproc.call(value) != true
raise ArgumentError, "Option #{key}'s value #{value} #{message}!"
end
end
end
end
end
end
end
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