286 lines
11 KiB
Ruby
286 lines
11 KiB
Ruby
# 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.
|
|
|
|
require "uri"
|
|
require "multi_json"
|
|
require "googleauth/signet"
|
|
require "googleauth/user_refresh"
|
|
|
|
module Google
|
|
module Auth
|
|
# Handles an interactive 3-Legged-OAuth2 (3LO) user consent authorization.
|
|
#
|
|
# Example usage for a simple command line app:
|
|
#
|
|
# credentials = authorizer.get_credentials(user_id)
|
|
# if credentials.nil?
|
|
# url = authorizer.get_authorization_url(
|
|
# base_url: OOB_URI)
|
|
# puts "Open the following URL in the browser and enter the " +
|
|
# "resulting code after authorization"
|
|
# puts url
|
|
# code = gets
|
|
# credentials = authorizer.get_and_store_credentials_from_code(
|
|
# user_id: user_id, code: code, base_url: OOB_URI)
|
|
# end
|
|
# # Credentials ready to use, call APIs
|
|
# ...
|
|
class UserAuthorizer
|
|
MISMATCHED_CLIENT_ID_ERROR =
|
|
"Token client ID of %s does not match configured client id %s".freeze
|
|
NIL_CLIENT_ID_ERROR = "Client id can not be nil.".freeze
|
|
NIL_SCOPE_ERROR = "Scope can not be nil.".freeze
|
|
NIL_USER_ID_ERROR = "User ID can not be nil.".freeze
|
|
NIL_TOKEN_STORE_ERROR = "Can not call method if token store is nil".freeze
|
|
MISSING_ABSOLUTE_URL_ERROR =
|
|
'Absolute base url required for relative callback url "%s"'.freeze
|
|
|
|
# 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
|
|
raise NIL_CLIENT_ID_ERROR if client_id.nil?
|
|
raise NIL_SCOPE_ERROR if scope.nil?
|
|
|
|
@client_id = client_id
|
|
@scope = Array(scope)
|
|
@token_store = token_store
|
|
@callback_uri = callback_uri || "/oauth2callback"
|
|
end
|
|
|
|
# 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 [String] state
|
|
# Opaque state value to be returned to the oauth callback.
|
|
# @param [String] base_url
|
|
# Absolute URL to resolve the configured callback uri against. Required
|
|
# if the configured callback uri is a relative.
|
|
# @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 = {}
|
|
scope = options[:scope] || @scope
|
|
credentials = UserRefreshCredentials.new(
|
|
client_id: @client_id.id,
|
|
client_secret: @client_id.secret,
|
|
scope: scope
|
|
)
|
|
redirect_uri = redirect_uri_for options[:base_url]
|
|
url = credentials.authorization_uri(access_type: "offline",
|
|
redirect_uri: redirect_uri,
|
|
approval_prompt: "force",
|
|
state: options[:state],
|
|
include_granted_scopes: true,
|
|
login_hint: options[:login_hint])
|
|
url.to_s
|
|
end
|
|
|
|
# Fetch stored credentials for the user.
|
|
#
|
|
# @param [String] user_id
|
|
# Unique ID of the user for loading/storing credentials.
|
|
# @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
|
|
def get_credentials user_id, scope = nil
|
|
saved_token = stored_token user_id
|
|
return nil if saved_token.nil?
|
|
data = MultiJson.load saved_token
|
|
|
|
if data.fetch("client_id", @client_id.id) != @client_id.id
|
|
raise format(MISMATCHED_CLIENT_ID_ERROR,
|
|
data["client_id"], @client_id.id)
|
|
end
|
|
|
|
credentials = UserRefreshCredentials.new(
|
|
client_id: @client_id.id,
|
|
client_secret: @client_id.secret,
|
|
scope: data["scope"] || @scope,
|
|
access_token: data["access_token"],
|
|
refresh_token: data["refresh_token"],
|
|
expires_at: data.fetch("expiration_time_millis", 0) / 1000
|
|
)
|
|
scope ||= @scope
|
|
return monitor_credentials user_id, credentials if credentials.includes_scope? scope
|
|
nil
|
|
end
|
|
|
|
# Exchanges an authorization code returned in the oauth callback
|
|
#
|
|
# @param [String] user_id
|
|
# Unique ID of the user for loading/storing credentials.
|
|
# @param [String] code
|
|
# The authorization code from the OAuth callback
|
|
# @param [String, Array<String>] scope
|
|
# Authorization scope requested. Overrides the instance
|
|
# scopes if not nil.
|
|
# @param [String] base_url
|
|
# Absolute URL to resolve the configured callback uri against.
|
|
# Required if the configured
|
|
# callback uri is a relative.
|
|
# @return [Google::Auth::UserRefreshCredentials]
|
|
# Credentials if exchange is successful
|
|
def get_credentials_from_code options = {}
|
|
user_id = options[:user_id]
|
|
code = options[:code]
|
|
scope = options[:scope] || @scope
|
|
base_url = options[:base_url]
|
|
credentials = UserRefreshCredentials.new(
|
|
client_id: @client_id.id,
|
|
client_secret: @client_id.secret,
|
|
redirect_uri: redirect_uri_for(base_url),
|
|
scope: scope
|
|
)
|
|
credentials.code = code
|
|
credentials.fetch_access_token!({})
|
|
monitor_credentials user_id, credentials
|
|
end
|
|
|
|
# Exchanges an authorization code returned in the oauth callback.
|
|
# Additionally, stores the resulting credentials in the token store if
|
|
# the exchange is successful.
|
|
#
|
|
# @param [String] user_id
|
|
# Unique ID of the user for loading/storing credentials.
|
|
# @param [String] code
|
|
# The authorization code from the OAuth callback
|
|
# @param [String, Array<String>] scope
|
|
# Authorization scope requested. Overrides the instance
|
|
# scopes if not nil.
|
|
# @param [String] base_url
|
|
# Absolute URL to resolve the configured callback uri against.
|
|
# Required if the configured
|
|
# callback uri is a relative.
|
|
# @return [Google::Auth::UserRefreshCredentials]
|
|
# Credentials if exchange is successful
|
|
def get_and_store_credentials_from_code options = {}
|
|
credentials = get_credentials_from_code options
|
|
store_credentials options[:user_id], credentials
|
|
end
|
|
|
|
# Revokes a user's credentials. This both revokes the actual
|
|
# grant as well as removes the token from the token store.
|
|
#
|
|
# @param [String] user_id
|
|
# Unique ID of the user for loading/storing credentials.
|
|
def revoke_authorization user_id
|
|
credentials = get_credentials user_id
|
|
if credentials
|
|
begin
|
|
@token_store.delete user_id
|
|
ensure
|
|
credentials.revoke!
|
|
end
|
|
end
|
|
nil
|
|
end
|
|
|
|
# Store credentials for a user. Generally not required to be
|
|
# called directly, but may be used to migrate tokens from one
|
|
# store to another.
|
|
#
|
|
# @param [String] user_id
|
|
# Unique ID of the user for loading/storing credentials.
|
|
# @param [Google::Auth::UserRefreshCredentials] credentials
|
|
# Credentials to store.
|
|
def store_credentials user_id, credentials
|
|
json = MultiJson.dump(
|
|
client_id: credentials.client_id,
|
|
access_token: credentials.access_token,
|
|
refresh_token: credentials.refresh_token,
|
|
scope: credentials.scope,
|
|
expiration_time_millis: credentials.expires_at.to_i * 1000
|
|
)
|
|
@token_store.store user_id, json
|
|
credentials
|
|
end
|
|
|
|
private
|
|
|
|
# @private Fetch stored token with given user_id
|
|
#
|
|
# @param [String] user_id
|
|
# Unique ID of the user for loading/storing credentials.
|
|
# @return [String] The saved token from @token_store
|
|
def stored_token user_id
|
|
raise NIL_USER_ID_ERROR if user_id.nil?
|
|
raise NIL_TOKEN_STORE_ERROR if @token_store.nil?
|
|
|
|
@token_store.load user_id
|
|
end
|
|
|
|
# Begin watching a credential for refreshes so the access token can be
|
|
# saved.
|
|
#
|
|
# @param [String] user_id
|
|
# Unique ID of the user for loading/storing credentials.
|
|
# @param [Google::Auth::UserRefreshCredentials] credentials
|
|
# Credentials to store.
|
|
def monitor_credentials user_id, credentials
|
|
credentials.on_refresh do |cred|
|
|
store_credentials user_id, cred
|
|
end
|
|
credentials
|
|
end
|
|
|
|
# Resolve the redirect uri against a base.
|
|
#
|
|
# @param [String] base_url
|
|
# Absolute URL to resolve the callback against if necessary.
|
|
# @return [String]
|
|
# Redirect URI
|
|
def redirect_uri_for base_url
|
|
return @callback_uri if uri_is_postmessage?(@callback_uri) || !URI(@callback_uri).scheme.nil?
|
|
raise format(MISSING_ABSOLUTE_URL_ERROR, @callback_uri) if base_url.nil? || URI(base_url).scheme.nil?
|
|
URI.join(base_url, @callback_uri).to_s
|
|
end
|
|
|
|
# Check if URI is Google's postmessage flow (not a valid redirect_uri by spec, but allowed)
|
|
def uri_is_postmessage? uri
|
|
uri.to_s.casecmp("postmessage").zero?
|
|
end
|
|
end
|
|
end
|
|
end
|