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require 'omniauth'
require 'hashie/mash'
module OmniAuth
class NoSessionError < StandardError; end
# The Strategy is the base unit of OmniAuth's ability to
# wrangle multiple providers. Each strategy provided by
# OmniAuth includes this mixin to gain the default functionality
# necessary to be compatible with the OmniAuth library.
module Strategy
def self.included(base)
OmniAuth.strategies << base
base.extend ClassMethods
base.class_eval do
option :setup, false
option :skip_info, false
end
end
module ClassMethods
# Returns an inherited set of default options set at the class-level
# for each strategy.
def default_options
return @default_options if instance_variable_defined?(:@default_options) && @default_options
existing = superclass.respond_to?(:default_options) ? superclass.default_options : {}
@default_options = OmniAuth::Strategy::Options.new(existing)
end
# This allows for more declarative subclassing of strategies by allowing
# default options to be set using a simple configure call.
#
# @param options [Hash] If supplied, these will be the default options (deep-merged into the superclass's default options).
# @yield [Options] The options Mash that allows you to set your defaults as you'd like.
#
# @example Using a yield to configure the default options.
#
# class MyStrategy
# include OmniAuth::Strategy
#
# configure do |c|
# c.foo = 'bar'
# end
# end
#
# @example Using a hash to configure the default options.
#
# class MyStrategy
# include OmniAuth::Strategy
# configure foo: 'bar'
# end
def configure(options = nil)
if block_given?
yield default_options
else
default_options.deep_merge!(options)
end
end
# Directly declare a default option for your class. This is a useful from
# a documentation perspective as it provides a simple line-by-line analysis
# of the kinds of options your strategy provides by default.
#
# @param name [Symbol] The key of the default option in your configuration hash.
# @param value [Object] The value your object defaults to. Nil if not provided.
#
# @example
#
# class MyStrategy
# include OmniAuth::Strategy
#
# option :foo, 'bar'
# option
# end
def option(name, value = nil)
default_options[name] = value
end
# Sets (and retrieves) option key names for initializer arguments to be
# recorded as. This takes care of 90% of the use cases for overriding
# the initializer in OmniAuth Strategies.
def args(args = nil)
if args
@args = Array(args)
return
end
existing = superclass.respond_to?(:args) ? superclass.args : []
return (instance_variable_defined?(:@args) && @args) || existing
end
%w(uid info extra credentials).each do |fetcher|
class_eval <<-RUBY
def #{fetcher}(&block)
return @#{fetcher}_proc unless block_given?
@#{fetcher}_proc = block
end
def #{fetcher}_stack(context)
compile_stack(self.ancestors, :#{fetcher}, context)
end
RUBY
end
def compile_stack(ancestors, method, context)
stack = ancestors.inject([]) do |a, ancestor|
a << context.instance_eval(&ancestor.send(method)) if ancestor.respond_to?(method) && ancestor.send(method)
a
end
stack.reverse!
end
end
attr_reader :app, :env, :options, :response
# Initializes the strategy by passing in the Rack endpoint,
# the unique URL segment name for this strategy, and any
# additional arguments. An `options` hash is automatically
# created from the last argument if it is a hash.
#
# @param app [Rack application] The application on which this middleware is applied.
#
# @overload new(app, options = {})
# If nothing but a hash is supplied, initialized with the supplied options
# overriding the strategy's default options via a deep merge.
# @overload new(app, *args, options = {})
# If the strategy has supplied custom arguments that it accepts, they may
# will be passed through and set to the appropriate values.
#
# @yield [Options] Yields options to block for further configuration.
def initialize(app, *args, &block)
@app = app
@env = nil
@options = self.class.default_options.dup
options.deep_merge!(args.pop) if args.last.is_a?(Hash)
options.name ||= self.class.to_s.split('::').last.downcase
self.class.args.each do |arg|
options[arg] = args.shift
end
# Make sure that all of the args have been dealt with, otherwise error out.
raise ArgumentError, "Received wrong number of arguments. #{args.inspect}" unless args.empty?
yield options if block_given?
end
def inspect
"#<#{self.class.to_s}>"
end
# Direct access to the OmniAuth logger, automatically prefixed
# with this strategy's name.
#
# @example
# log :warn, "This is a warning."
def log(level, message)
OmniAuth.logger.send(level, "(#{name}) #{message}")
end
# Duplicates this instance and runs #call! on it.
# @param [Hash] The Rack environment.
def call(env)
dup.call!(env)
end
# The logic for dispatching any additional actions that need
# to be taken. For instance, calling the request phase if
# the request path is recognized.
#
# @param env [Hash] The Rack environment.
def call!(env)
raise OmniAuth::NoSessionError.new("You must provide a session to use OmniAuth.") unless env['rack.session']
@env = env
@env['omniauth.strategy'] = self if on_auth_path?
return mock_call!(env) if OmniAuth.config.test_mode
return options_call if on_auth_path? && options_request?
return request_call if on_request_path? && OmniAuth.config.allowed_request_methods.include?(request.request_method.downcase.to_sym)
return callback_call if on_callback_path?
return other_phase if respond_to?(:other_phase)
@app.call(env)
end
# Responds to an OPTIONS request.
def options_call
verbs = OmniAuth.config.allowed_request_methods.map(&:to_s).map(&:upcase).join(', ')
return [ 200, { 'Allow' => verbs }, [] ]
end
# Performs the steps necessary to run the request phase of a strategy.
def request_call
setup_phase
log :info, "Request phase initiated."
#store query params from the request url, extracted in the callback_phase
session['omniauth.params'] = request.params
if options.form.respond_to?(:call)
log :info, "Rendering form from supplied Rack endpoint."
options.form.call(env)
elsif options.form
log :info, "Rendering form from underlying application."
call_app!
else
if request.params['origin']
env['rack.session']['omniauth.origin'] = request.params['origin']
elsif env['HTTP_REFERER'] && !env['HTTP_REFERER'].match(/#{request_path}$/)
env['rack.session']['omniauth.origin'] = env['HTTP_REFERER']
end
request_phase
end
end
# Performs the steps necessary to run the callback phase of a strategy.
def callback_call
setup_phase
log :info, "Callback phase initiated."
@env['omniauth.origin'] = session.delete('omniauth.origin')
@env['omniauth.origin'] = nil if env['omniauth.origin'] == ''
@env['omniauth.params'] = session.delete('omniauth.params') || {}
callback_phase
end
# Returns true if the environment recognizes either the
# request or callback path.
def on_auth_path?
on_request_path? || on_callback_path?
end
def on_request_path?
if options.request_path.respond_to?(:call)
options.request_path.call(env)
else
on_path?(request_path)
end
end
def on_callback_path?
on_path?(callback_path)
end
def on_path?(path)
current_path.casecmp(path) == 0
end
def options_request?
request.request_method == 'OPTIONS'
end
# This is called in lieu of the normal request process
# in the event that OmniAuth has been configured to be
# in test mode.
def mock_call!(env)
return mock_request_call if on_request_path?
return mock_callback_call if on_callback_path?
call_app!
end
def mock_request_call
setup_phase
session['omniauth.params'] = request.params
if request.params['origin']
@env['rack.session']['omniauth.origin'] = request.params['origin']
elsif env['HTTP_REFERER'] && !env['HTTP_REFERER'].match(/#{request_path}$/)
@env['rack.session']['omniauth.origin'] = env['HTTP_REFERER']
end
redirect(script_name + callback_path + query_string)
end
def mock_callback_call
setup_phase
mocked_auth = OmniAuth.mock_auth_for(name.to_s)
if mocked_auth.is_a?(Symbol)
fail!(mocked_auth)
else
@env['omniauth.auth'] = mocked_auth
@env['omniauth.params'] = session.delete('omniauth.params') || {}
@env['omniauth.origin'] = session.delete('omniauth.origin')
@env['omniauth.origin'] = nil if env['omniauth.origin'] == ''
call_app!
end
end
# The setup phase looks for the `:setup` option to exist and,
# if it is, will call either the Rack endpoint supplied to the
# `:setup` option or it will call out to the setup path of the
# underlying application. This will default to `/auth/:provider/setup`.
def setup_phase
if options[:setup].respond_to?(:call)
log :info, "Setup endpoint detected, running now."
options[:setup].call(env)
elsif options.setup?
log :info, "Calling through to underlying application for setup."
setup_env = env.merge('PATH_INFO' => setup_path, 'REQUEST_METHOD' => 'GET')
call_app!(setup_env)
end
end
# @abstract This method is called when the user is on the request path. You should
# perform any information gathering you need to be able to authenticate
# the user in this phase.
def request_phase
raise NotImplementedError
end
def uid
self.class.uid_stack(self).last
end
def info
merge_stack(self.class.info_stack(self))
end
def credentials
merge_stack(self.class.credentials_stack(self))
end
def extra
merge_stack(self.class.extra_stack(self))
end
def auth_hash
hash = AuthHash.new(:provider => name, :uid => uid)
hash.info = info unless skip_info?
hash.credentials = credentials if credentials
hash.extra = extra if extra
hash
end
# Determines whether or not user info should be retrieved. This
# allows some strategies to save a call to an external API service
# for existing users. You can use it either by setting the `:skip_info`
# to true or by setting `:skip_info` to a Proc that takes a uid and
# evaluates to true when you would like to skip info.
#
# @example
#
# use MyStrategy, :skip_info => lambda{|uid| User.find_by_uid(uid)}
def skip_info?
if options.skip_info?
if options.skip_info.respond_to?(:call)
return options.skip_info.call(uid)
else
return true
end
end
false
end
def callback_phase
self.env['omniauth.auth'] = auth_hash
call_app!
end
def path_prefix
options[:path_prefix] || OmniAuth.config.path_prefix
end
def custom_path(kind)
if options[kind].respond_to?(:call)
result = options[kind].call(env)
return nil unless result.is_a?(String)
result
else
options[kind]
end
end
def request_path
options[:request_path].is_a?(String) ? options[:request_path] : "#{path_prefix}/#{name}"
end
def callback_path
path = options[:callback_path] if options[:callback_path].is_a?(String)
path ||= current_path if options[:callback_path].respond_to?(:call) && options[:callback_path].call(env)
path ||= custom_path(:request_path)
path ||= "#{path_prefix}/#{name}/callback"
end
def setup_path
options[:setup_path] || "#{path_prefix}/#{name}/setup"
end
def current_path
request.path_info.downcase.sub(/\/$/,'')
end
def query_string
request.query_string.empty? ? "" : "?#{request.query_string}"
end
def call_app!(env = @env)
@app.call(env)
end
def full_host
case OmniAuth.config.full_host
when String
OmniAuth.config.full_host
when Proc
OmniAuth.config.full_host.call(env)
else
uri = URI.parse(request.url.gsub(/\?.*$/,''))
uri.path = ''
#sometimes the url is actually showing http inside rails because the other layers (like nginx) have handled the ssl termination.
uri.scheme = 'https' if ssl?
uri.to_s
end
end
def callback_url
full_host + script_name + callback_path + query_string
end
def script_name
@env['SCRIPT_NAME'] || ''
end
def session
@env['rack.session']
end
def request
@request ||= Rack::Request.new(@env)
end
def name
options.name
end
def redirect(uri)
r = Rack::Response.new
if options[:iframe]
r.write("<script type='text/javascript' charset='utf-8'>top.location.href = '#{uri}';</script>")
else
r.write("Redirecting to #{uri}...")
r.redirect(uri)
end
r.finish
end
def user_info; {} end
def fail!(message_key, exception = nil)
self.env['omniauth.error'] = exception
self.env['omniauth.error.type'] = message_key.to_sym
self.env['omniauth.error.strategy'] = self
if exception
log :error, "Authentication failure! #{message_key}: #{exception.class.to_s}, #{exception.message}"
else
log :error, "Authentication failure! #{message_key} encountered."
end
OmniAuth.config.on_failure.call(self.env)
end
class Options < Hashie::Mash; end
protected
def merge_stack(stack)
stack.inject({}){|c,h| c.merge!(h); c}
end
def ssl?
request.env['HTTPS'] == 'on' ||
request.env['HTTP_X_FORWARDED_SSL'] == 'on' ||
request.env['HTTP_X_FORWARDED_SCHEME'] == 'https' ||
(request.env['HTTP_X_FORWARDED_PROTO'] && request.env['HTTP_X_FORWARDED_PROTO'].split(',')[0] == 'https') ||
request.env['rack.url_scheme'] == 'https'
end
end
end
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