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# Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file 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.
module AWS
module Core
module Signers
# @api private
class S3
SUB_RESOURCES = %w(
acl location logging notification partNumber policy
requestPayment torrent uploadId uploads versionId
versioning versions restore delete lifecycle tagging cors
website
)
QUERY_PARAMS = %w(
response-content-type response-content-language
response-expires response-cache-control
response-content-disposition response-content-encoding
)
# @param [CredentialProviders::Provider] credentials
def initialize credentials
@credentials = credentials
end
# @return [CredentialProviders::Provider]
attr_reader :credentials
# @param [Http::Request] req
# @return [Http::Request]
def sign_request req
if token = credentials.session_token
req.headers["x-amz-security-token"] = token
end
req.headers["authorization"] = authorization(req)
end
private
def authorization req
"AWS #{credentials.access_key_id}:#{signature(req)}"
end
def signature req
secret = credentials.secret_access_key
signature = self.class.string_to_sign(req)
signature = Base.sign(credentials.secret_access_key, signature, 'sha1')
URI.escape(signature)
end
class << self
# From the S3 developer guide:
#
# StringToSign =
# HTTP-Verb ` "\n" `
# content-md5 ` "\n" `
# content-type ` "\n" `
# date ` "\n" `
# CanonicalizedAmzHeaders + CanonicalizedResource;
#
def string_to_sign req
[
req.http_method,
req.headers.values_at('content-md5', 'content-type').join("\n"),
signing_string_date(req),
canonicalized_headers(req),
canonicalized_resource(req),
].flatten.compact.join("\n")
end
def signing_string_date req
# if a date is provided via x-amz-date then we should omit the
# Date header from the signing string (should appear as a blank line)
if req.headers.detect{|k,v| k.to_s =~ /^x-amz-date$/i }
''
else
req.headers['date'] ||= Time.now.httpdate
end
end
# CanonicalizedAmzHeaders
#
# See the developer guide for more information on how this element
# is generated.
#
def canonicalized_headers req
x_amz = req.headers.select{|k, v| k.to_s =~ /^x-amz-/i }
x_amz = x_amz.collect{|k, v| [k.downcase, v] }
x_amz = x_amz.sort_by{|k, v| k }
x_amz = x_amz.collect{|k, v| "#{k}:#{v.to_s.strip}" }.join("\n")
x_amz == '' ? nil : x_amz
end
# From the S3 developer guide
#
# CanonicalizedResource =
# [ "/" ` Bucket ] `
# <HTTP-Request-URI, protocol name up to the querystring> +
# [ sub-resource, if present. e.g. "?acl", "?location",
# "?logging", or "?torrent"];
#
# @api private
def canonicalized_resource req
parts = []
# virtual hosted-style requests require the hostname to appear
# in the canonicalized resource prefixed by a forward slash.
if
AWS::S3::Client.dns_compatible_bucket_name?(req.bucket) and
!req.path_style?
then
parts << "/#{req.bucket}"
end
# all requests require the portion of the un-decoded uri up to
# but not including the query string
parts << req.path
# lastly any sub resource querystring params need to be appened
# in lexigraphical ordered joined by '&' and prefixed by '?'
params =
sub_resource_params(req) +
query_parameters_for_signature(req)
unless params.empty?
parts << '?'
parts << params.sort.collect{|p| p.to_s }.join('&')
end
parts.join
end
def sub_resource_params req
req.params.select{|p| SUB_RESOURCES.include?(p.name) }
end
def query_parameters_for_signature req
req.params.select { |p| QUERY_PARAMS.include?(p.name) }
end
end
end
end
end
end
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