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Merge pull request #51 from sqrrrl/master
Round 2 of 3LO support - web flow
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# Copyright 2014, Google Inc. | ||
# All rights reserved. | ||
# | ||
# Redistribution and use in source and binary forms, with or without | ||
# modification, are permitted provided that the following conditions are | ||
# met: | ||
# | ||
# * Redistributions of source code must retain the above copyright | ||
# notice, this list of conditions and the following disclaimer. | ||
# * Redistributions in binary form must reproduce the above | ||
# copyright notice, this list of conditions and the following disclaimer | ||
# in the documentation and/or other materials provided with the | ||
# distribution. | ||
# * Neither the name of Google Inc. nor the names of its | ||
# contributors may be used to endorse or promote products derived from | ||
# this software without specific prior written permission. | ||
# | ||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
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require 'multi_json' | ||
require 'googleauth/signet' | ||
require 'googleauth/user_authorizer' | ||
require 'googleauth/user_refresh' | ||
require 'securerandom' | ||
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module Google | ||
module Auth | ||
# Varation on {Google::Auth::UserAuthorizer} adapted for Rack based | ||
# web applications. | ||
# | ||
# Example usage: | ||
# | ||
# get('/') do | ||
# user_id = request.session['user_email'] | ||
# credentials = authorizer.get_credentials(user_id, request) | ||
# if credentials.nil? | ||
# redirect authorizer.get_redirect_uri(user_id, request) | ||
# end | ||
# # Credentials are valid, can call APIs | ||
# ... | ||
# end | ||
# | ||
# get('/oauth2callback') do | ||
# user_id = request.session['user_email'] | ||
# _, return_uri = authorizer.handle_auth_callback(user_id, request) | ||
# redirect return_uri | ||
# end | ||
# | ||
# Instead of implementing the callback directly, applications are | ||
# encouraged to use {Google::Auth::Web::AuthCallbackApp} instead. | ||
# | ||
# For rails apps, see {Google::Auth::ControllerHelpers} | ||
# | ||
# @see {Google::Auth::AuthCallbackApp} | ||
# @see {Google::Auth::ControllerHelpers} | ||
# @note Requires sessions are enabled | ||
class WebUserAuthorizer < Google::Auth::UserAuthorizer | ||
STATE_PARAM = 'state' | ||
AUTH_CODE_KEY = 'code' | ||
ERROR_CODE_KEY = 'error' | ||
SESSION_ID_KEY = 'session_id' | ||
CALLBACK_STATE_KEY = 'g-auth-callback' | ||
CURRENT_URI_KEY = 'current_uri' | ||
XSRF_KEY = 'g-xsrf-token' | ||
SCOPE_KEY = 'scope' | ||
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NIL_REQUEST_ERROR = 'Request is required.' | ||
NIL_SESSION_ERROR = 'Sessions must be enabled' | ||
MISSING_AUTH_CODE_ERROR = 'Missing authorization code in request' | ||
AUTHORIZATION_ERROR = 'Authorization error: %s' | ||
INVALID_STATE_TOKEN_ERROR = 'State token does not match expected value' | ||
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class << self | ||
attr_accessor :default | ||
end | ||
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# Handle the result of the oauth callback. This version defers the | ||
# exchange of the code by temporarily stashing the results in the user's | ||
# session. This allows apps to use the generic | ||
# {Google::Auth::WebUserAuthorizer::CallbackApp} handler for the callback | ||
# without any additional customization. | ||
# | ||
# Apps that wish to handle the callback directly should use | ||
# {#handle_auth_callback} instead. | ||
# | ||
# @param [Rack::Request] request | ||
# Current request | ||
def self.handle_auth_callback_deferred(request) | ||
callback_state, redirect_uri = extract_callback_state(request) | ||
request.session[CALLBACK_STATE_KEY] = MultiJson.dump(callback_state) | ||
redirect_uri | ||
end | ||
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# Initialize the authorizer | ||
# | ||
# @param [Google::Auth::ClientID] client_id | ||
# Configured ID & secret for this application | ||
# @param [String, Array<String>] scope | ||
# Authorization scope to request | ||
# @param [Google::Auth::Stores::TokenStore] token_store | ||
# Backing storage for persisting user credentials | ||
# @param [String] callback_uri | ||
# URL (either absolute or relative) of the auth callback. Defaults | ||
# to '/oauth2callback' | ||
def initialize(client_id, scope, token_store, callback_uri = nil) | ||
super(client_id, scope, token_store, callback_uri) | ||
end | ||
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# Handle the result of the oauth callback. Exchanges the authorization | ||
# code from the request and persists to storage. | ||
# | ||
# @param [String] user_id | ||
# Unique ID of the user for loading/storing credentials. | ||
# @param [Rack::Request] request | ||
# Current request | ||
# @return (Google::Auth::UserRefreshCredentials, String) | ||
# credentials & next URL to redirect to | ||
def handle_auth_callback(user_id, request) | ||
callback_state, redirect_uri = WebUserAuthorizer.extract_callback_state( | ||
request) | ||
WebUserAuthorizer.validate_callback_state(callback_state, request) | ||
credentials = get_and_store_credentials_from_code( | ||
user_id: user_id, | ||
code: callback_state[AUTH_CODE_KEY], | ||
scope: callback_state[SCOPE_KEY], | ||
base_url: request.url) | ||
[credentials, redirect_uri] | ||
end | ||
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# Build the URL for requesting authorization. | ||
# | ||
# @param [String] login_hint | ||
# Login hint if need to authorize a specific account. Should be a | ||
# user's email address or unique profile ID. | ||
# @param [Rack::Request] request | ||
# Current request | ||
# @param [String] redirect_to | ||
# Optional URL to proceed to after authorization complete. Defaults to | ||
# the current URL. | ||
# @param [String, Array<String>] scope | ||
# Authorization scope to request. Overrides the instance scopes if | ||
# not nil. | ||
# @return [String] | ||
# Authorization url | ||
def get_authorization_url(options = {}) | ||
options = options.dup | ||
request = options[:request] | ||
fail NIL_REQUEST_ERROR if request.nil? | ||
fail NIL_SESSION_ERROR if request.session.nil? | ||
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redirect_to = options[:redirect_to] || request.url | ||
request.session[XSRF_KEY] = SecureRandom.base64 | ||
options[:state] = MultiJson.dump( | ||
SESSION_ID_KEY => request.session[XSRF_KEY], | ||
CURRENT_URI_KEY => redirect_to) | ||
options[:base_url] = request.url | ||
super(options) | ||
end | ||
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# Fetch stored credentials for the user. | ||
# | ||
# @param [String] user_id | ||
# Unique ID of the user for loading/storing credentials. | ||
# @param [Rack::Request] request | ||
# Current request | ||
# @param [Array<String>, String] scope | ||
# If specified, only returns credentials that have all the \ | ||
# requested scopes | ||
# @return [Google::Auth::UserRefreshCredentials] | ||
# Stored credentials, nil if none present | ||
# @raise [Signet::AuthorizationError] | ||
# May raise an error if an authorization code is present in the session | ||
# and exchange of the code fails | ||
def get_credentials(user_id, request, scope = nil) | ||
if request.session.key?(CALLBACK_STATE_KEY) | ||
# Note - in theory, no need to check required scope as this is | ||
# expected to be called immediately after a return from authorization | ||
state_json = request.session.delete(CALLBACK_STATE_KEY) | ||
callback_state = MultiJson.load(state_json) | ||
WebUserAuthorizer.validate_callback_state(callback_state, request) | ||
get_and_store_credentials_from_code( | ||
user_id: user_id, | ||
code: callback_state[AUTH_CODE_KEY], | ||
scope: callback_state[SCOPE_KEY], | ||
base_url: request.url) | ||
else | ||
super(user_id, scope) | ||
end | ||
end | ||
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def self.extract_callback_state(request) | ||
state = MultiJson.load(request[STATE_PARAM] || '{}') | ||
redirect_uri = state[CURRENT_URI_KEY] | ||
callback_state = { | ||
AUTH_CODE_KEY => request[AUTH_CODE_KEY], | ||
ERROR_CODE_KEY => request[ERROR_CODE_KEY], | ||
SESSION_ID_KEY => state[SESSION_ID_KEY], | ||
SCOPE_KEY => request[SCOPE_KEY] | ||
} | ||
[callback_state, redirect_uri] | ||
end | ||
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# Verifies the results of an authorization callback | ||
# | ||
# @param [Hash] state | ||
# Callback state | ||
# @option state [String] AUTH_CODE_KEY | ||
# The authorization code | ||
# @option state [String] ERROR_CODE_KEY | ||
# Error message if failed | ||
# @param [Rack::Request] request | ||
# Current request | ||
def self.validate_callback_state(state, request) | ||
if state[AUTH_CODE_KEY].nil? | ||
fail Signet::AuthorizationError, MISSING_AUTH_CODE_ERROR | ||
elsif state[ERROR_CODE_KEY] | ||
fail Signet::AuthorizationError, | ||
sprintf(AUTHORIZATION_ERROR, state[ERROR_CODE_KEY]) | ||
elsif request.session[XSRF_KEY] != state[SESSION_ID_KEY] | ||
fail Signet::AuthorizationError, INVALID_STATE_TOKEN_ERROR | ||
end | ||
end | ||
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# Small Rack app which acts as the default callback handler for the app. | ||
# | ||
# To configure in Rails, add to routes.rb: | ||
# | ||
# match '/oauth2callback', | ||
# to: Google::Auth::WebUserAuthorizer::CallbackApp, | ||
# via: :all | ||
# | ||
# With Rackup, add to config.ru: | ||
# | ||
# map '/oauth2callback' do | ||
# run Google::Auth::WebUserAuthorizer::CallbackApp | ||
# end | ||
# | ||
# Or in a classic Sinatra app: | ||
# | ||
# get('/oauth2callback') do | ||
# Google::Auth::WebUserAuthorizer::CallbackApp.call(env) | ||
# end | ||
# | ||
# @see {Google::Auth::WebUserAuthorizer} | ||
class CallbackApp | ||
LOCATION_HEADER = 'Location' | ||
REDIR_STATUS = 302 | ||
ERROR_STATUS = 500 | ||
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# Handle a rack request. Simply stores the results the authorization | ||
# in the session temporarily and redirects back to to the previously | ||
# saved redirect URL. Credentials can be later retrieved by calling. | ||
# {Google::Auth::Web::WebUserAuthorizer#get_credentials} | ||
# | ||
# See {Google::Auth::Web::WebUserAuthorizer#get_authorization_uri} | ||
# for how to initiate authorization requests. | ||
# | ||
# @param [Hash] env | ||
# Rack environment | ||
# @return [Array] | ||
# HTTP response | ||
def self.call(env) | ||
request = Rack::Request.new(env) | ||
return_url = WebUserAuthorizer.handle_auth_callback_deferred(request) | ||
if return_url | ||
[REDIR_STATUS, { LOCATION_HEADER => return_url }, []] | ||
else | ||
[ERROR_STATUS, {}, ['No return URL is present in the request.']] | ||
end | ||
end | ||
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def call(env) | ||
self.class.call(env) | ||
end | ||
end | ||
end | ||
end | ||
end |
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