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fog--fog/lib/fog/aws/dynamodb.rb
2012-04-25 10:31:28 -04:00

161 lines
5 KiB
Ruby

require File.expand_path(File.join(File.dirname(__FILE__), '..', 'aws'))
module Fog
module AWS
class DynamoDB < Fog::Service
requires :aws_access_key_id, :aws_secret_access_key
recognizes :aws_session_token, :host, :path, :port, :scheme, :persistent, :region
request_path 'fog/aws/requests/dynamodb'
request :batch_get_item
request :batch_put_item
request :create_table
request :delete_item
request :delete_table
request :describe_table
request :get_item
request :list_tables
request :put_item
request :query
request :scan
request :update_item
request :update_table
class Mock
def self.data
@data ||= Hash.new do |hash, key|
hash[key] = {
:domains => {}
}
end
end
def self.reset
@data = nil
end
def initialize(options={})
@aws_access_key_id = options[:aws_access_key_id]
end
def data
self.class.data[@aws_access_key_id]
end
def reset_data
self.class.data.delete(@aws_access_key_id)
end
end
class Real
# Initialize connection to DynamoDB
#
# ==== Notes
# options parameter must include values for :aws_access_key_id and
# :aws_secret_access_key in order to create a connection
#
# ==== Examples
# ddb = DynamoDB.new(
# :aws_access_key_id => your_aws_access_key_id,
# :aws_secret_access_key => your_aws_secret_access_key
# )
#
# ==== Parameters
# * options<~Hash> - config arguments for connection. Defaults to {}.
#
# ==== Returns
# * DynamoDB object with connection to aws
def initialize(options={})
if options[:aws_session_token]
@aws_access_key_id = options[:aws_access_key_id]
@aws_secret_access_key = options[:aws_secret_access_key]
@aws_session_token = options[:aws_session_token]
else
sts = Fog::AWS::STS.new(
:aws_access_key_id => options[:aws_access_key_id],
:aws_secret_access_key => options[:aws_secret_access_key]
)
session_data = sts.get_session_token.body
@aws_access_key_id = session_data['AccessKeyId']
@aws_secret_access_key = session_data['SecretAccessKey']
@aws_session_token = session_data['SessionToken']
end
@connection_options = options[:connection_options] || {}
@hmac = Fog::HMAC.new('sha256', @aws_secret_access_key)
options[:region] ||= 'us-east-1'
@host = options[:host] || "dynamodb.#{options[:region]}.amazonaws.com"
@path = options[:path] || '/'
@persistent = options[:persistent] || false
@port = options[:port] || '80' #443
@scheme = options[:scheme] || 'http' #'https'
@connection = Fog::Connection.new("#{@scheme}://#{@host}:#{@port}#{@path}", @persistent, @connection_options)
end
private
def reload
@connection.reset
end
def request(params)
idempotent = params.delete(:idempotent)
now = Fog::Time.now
headers = {
'Content-Type' => 'application/x-amz-json-1.0',
'x-amz-date' => Fog::Time.now.to_date_header,
'x-amz-security-token' => @aws_session_token
}.merge(params[:headers])
headers['x-amzn-authorization'] = signed_authorization_header(params, headers)
response = @connection.request({
:body => params[:body],
:expects => 200,
:headers => headers,
:host => @host,
:idempotent => idempotent,
:method => 'POST',
})
unless response.body.empty?
response.body = Fog::JSON.decode(response.body)
end
response
end
def signed_authorization_header(params, headers)
string_to_sign = "POST\n/\n\nhost:#{@host}:#{@port}\n"
amz_headers, canonical_amz_headers = {}, ''
for key, value in headers
if key[0..5] == 'x-amz-'
amz_headers[key] = value
end
end
amz_headers = amz_headers.sort {|x, y| x[0] <=> y[0]}
for key, value in amz_headers
canonical_amz_headers << "#{key}:#{value}\n"
end
string_to_sign << canonical_amz_headers
string_to_sign << "\n"
string_to_sign << (params[:body] || '')
string_to_sign = OpenSSL::Digest::SHA256.digest(string_to_sign)
signed_string = @hmac.sign(string_to_sign)
signature = Base64.encode64(signed_string).chomp!
"AWS3 AWSAccessKeyId=#{@aws_access_key_id},Algorithm=HmacSHA256,Signature=#{signature}"
end
end
end
end
end