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# Copyright 2021 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require "faraday"
module Gapic
module Rest
# Registers the middleware with Faraday
module FaradayMiddleware
##
# @private
# Request middleware that constructs the Authorization HTTP header
# using ::Google::Auth::Credentials
#
class GoogleAuthorization < Faraday::Middleware
##
# @private
# @param app [#call]
# @param credentials [Google::Auth::Credentials, Signet::OAuth2::Client, Symbol, Proc]
# Provides the means for authenticating requests made by
# the client. This parameter can be many types:
# * A `Google::Auth::Credentials` uses a the properties of its represented keyfile for authenticating requests
# made by this client.
# * A `Signet::OAuth2::Client` object used to apply the OAuth credentials.
# * A `Proc` will be used as an updater_proc for the auth token.
# * A `Symbol` is treated as a signal that authentication is not required.
#
def initialize app, credentials
@updater_proc = case credentials
when Symbol
credentials
else
updater_proc = credentials.updater_proc if credentials.respond_to? :updater_proc
updater_proc ||= credentials if credentials.is_a? Proc
raise ArgumentError, "invalid credentials (#{credentials.class})" if updater_proc.nil?
updater_proc
end
super app
end
# @private
# @param env [Faraday::Env]
def call env
unless @updater_proc.is_a? Symbol
auth_hash = @updater_proc.call({})
env.request_headers["Authorization"] = auth_hash[:authorization]
end
@app.call env
end
end
Faraday::Request.register_middleware google_authorization: -> { GoogleAuthorization }
end
end
end
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