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require 'net/https'
require 'date'
require 'time'
require 'uri'
require 'benchmark'
module ActiveResource
class ConnectionError < StandardError # :nodoc:
attr_reader :response
def initialize(response, message = nil)
@response = response
@message = message
end
def to_s
"Failed with #{response.code} #{response.message if response.respond_to?(:message)}"
end
end
# Raised when a Timeout::Error occurs.
class TimeoutError < ConnectionError
def initialize(message)
@message = message
end
def to_s; @message ;end
end
# 3xx Redirection
class Redirection < ConnectionError # :nodoc:
def to_s; response['Location'] ? "#{super} => #{response['Location']}" : super; end
end
# 4xx Client Error
class ClientError < ConnectionError; end # :nodoc:
# 400 Bad Request
class BadRequest < ClientError; end # :nodoc
# 401 Unauthorized
class UnauthorizedAccess < ClientError; end # :nodoc
# 403 Forbidden
class ForbiddenAccess < ClientError; end # :nodoc
# 404 Not Found
class ResourceNotFound < ClientError; end # :nodoc:
# 409 Conflict
class ResourceConflict < ClientError; end # :nodoc:
# 5xx Server Error
class ServerError < ConnectionError; end # :nodoc:
# 405 Method Not Allowed
class MethodNotAllowed < ClientError # :nodoc:
def allowed_methods
@response['Allow'].split(',').map { |verb| verb.strip.downcase.to_sym }
end
end
# 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'
}
attr_reader :site, :user, :password, :timeout
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[:xml])
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
# 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
# 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))
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)
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 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
http = Net::HTTP.new(@site.host, @site.port)
http.use_ssl = @site.is_a?(URI::HTTPS)
http.verify_mode = OpenSSL::SSL::VERIFY_NONE if http.use_ssl
http.read_timeout = @timeout if @timeout # If timeout is not set, the default Net::HTTP timeout (60s) is used.
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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