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require 'active_support/core_ext/benchmark'
require 'net/https'
require 'date'
require 'time'
require 'uri'
module ActiveResource
# Class to handle connections to remote web services.
# This class is used by ActiveResource::Base to interface with REST
# services.
class Connection
HTTP_FORMAT_HEADER_NAMES = { :get => 'Accept',
:put => 'Content-Type',
:post => 'Content-Type',
:delete => 'Accept',
:head => 'Accept'
}
attr_reader :site, :user, :password, :timeout, :proxy, :ssl_options
attr_accessor :format
class << self
def requests
@@requests ||= []
end
end
# The +site+ parameter is required and will set the +site+
# attribute to the URI for the remote resource service.
def initialize(site, format = ActiveResource::Formats::XmlFormat)
raise ArgumentError, 'Missing site URI' unless site
@user = @password = nil
self.site = site
self.format = format
end
# Set URI for remote service.
def site=(site)
@site = site.is_a?(URI) ? site : URI.parse(site)
@user = URI.decode(@site.user) if @site.user
@password = URI.decode(@site.password) if @site.password
end
# Set the proxy for remote service.
def proxy=(proxy)
@proxy = proxy.is_a?(URI) ? proxy : URI.parse(proxy)
end
# Sets the user for remote service.
def user=(user)
@user = user
end
# Sets the password for remote service.
def password=(password)
@password = password
end
# Sets the number of seconds after which HTTP requests to the remote service should time out.
def timeout=(timeout)
@timeout = timeout
end
# Hash of options applied to Net::HTTP instance when +site+ protocol is 'https'.
def ssl_options=(opts={})
@ssl_options = opts
end
# Executes a GET request.
# Used to get (find) resources.
def get(path, headers = {})
format.decode(request(:get, path, build_request_headers(headers, :get)).body)
end
# Executes a DELETE request (see HTTP protocol documentation if unfamiliar).
# Used to delete resources.
def delete(path, headers = {})
request(:delete, path, build_request_headers(headers, :delete))
end
# Executes a PUT request (see HTTP protocol documentation if unfamiliar).
# Used to update resources.
def put(path, body = '', headers = {})
request(:put, path, body.to_s, build_request_headers(headers, :put))
end
# Executes a POST request.
# Used to create new resources.
def post(path, body = '', headers = {})
request(:post, path, body.to_s, build_request_headers(headers, :post))
end
# Executes a HEAD request.
# Used to obtain meta-information about resources, such as whether they exist and their size (via response headers).
def head(path, headers = {})
request(:head, path, build_request_headers(headers, :head))
end
private
# Makes a request to the remote service.
def request(method, path, *arguments)
logger.info "#{method.to_s.upcase} #{site.scheme}://#{site.host}:#{site.port}#{path}" if logger
result = nil
ms = Benchmark.ms { result = http.send(method, path, *arguments) }
logger.info "--> %d %s (%d %.0fms)" % [result.code, result.message, result.body ? result.body.length : 0, ms] if logger
handle_response(result)
rescue Timeout::Error => e
raise TimeoutError.new(e.message)
rescue OpenSSL::SSL::SSLError => e
raise SSLError.new(e.message)
end
# Handles response and error codes from the remote service.
def handle_response(response)
case response.code.to_i
when 301,302
raise(Redirection.new(response))
when 200...400
response
when 400
raise(BadRequest.new(response))
when 401
raise(UnauthorizedAccess.new(response))
when 403
raise(ForbiddenAccess.new(response))
when 404
raise(ResourceNotFound.new(response))
when 405
raise(MethodNotAllowed.new(response))
when 409
raise(ResourceConflict.new(response))
when 410
raise(ResourceGone.new(response))
when 422
raise(ResourceInvalid.new(response))
when 401...500
raise(ClientError.new(response))
when 500...600
raise(ServerError.new(response))
else
raise(ConnectionError.new(response, "Unknown response code: #{response.code}"))
end
end
# Creates new Net::HTTP instance for communication with the
# remote service and resources.
def http
configure_http(new_http)
end
def new_http
if @proxy
Net::HTTP.new(@site.host, @site.port, @proxy.host, @proxy.port, @proxy.user, @proxy.password)
else
Net::HTTP.new(@site.host, @site.port)
end
end
def configure_http(http)
http = apply_ssl_options(http)
# Net::HTTP timeouts default to 60 seconds.
if @timeout
http.open_timeout = @timeout
http.read_timeout = @timeout
end
http
end
def apply_ssl_options(http)
return http unless @site.is_a?(URI::HTTPS)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE
return http unless defined?(@ssl_options)
http.ca_path = @ssl_options[:ca_path] if @ssl_options[:ca_path]
http.ca_file = @ssl_options[:ca_file] if @ssl_options[:ca_file]
http.cert = @ssl_options[:cert] if @ssl_options[:cert]
http.key = @ssl_options[:key] if @ssl_options[:key]
http.cert_store = @ssl_options[:cert_store] if @ssl_options[:cert_store]
http.ssl_timeout = @ssl_options[:ssl_timeout] if @ssl_options[:ssl_timeout]
http.verify_mode = @ssl_options[:verify_mode] if @ssl_options[:verify_mode]
http.verify_callback = @ssl_options[:verify_callback] if @ssl_options[:verify_callback]
http.verify_depth = @ssl_options[:verify_depth] if @ssl_options[:verify_depth]
http
end
def default_header
@default_header ||= {}
end
# Builds headers for request to remote service.
def build_request_headers(headers, http_method=nil)
authorization_header.update(default_header).update(http_format_header(http_method)).update(headers)
end
# Sets authorization header
def authorization_header
(@user || @password ? { 'Authorization' => 'Basic ' + ["#{@user}:#{ @password}"].pack('m').delete("\r\n") } : {})
end
def http_format_header(http_method)
{HTTP_FORMAT_HEADER_NAMES[http_method] => format.mime_type}
end
def logger #:nodoc:
Base.logger
end
end
end
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