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Sometimes you may find your Active Resource model may need to access a service on another network that is only accessible through a proxy server on your network (a forward proxy) This is often the case in your development environment where you may have to access the Internet through a proxy server, or perhaps an intranet application that needs data from the Internet In particularly thrifty enterprise networks (where Internet access is actively discouraged), the proxy server may even require authentication It is far better to work with the infrastructure teams to remove the need for proxy authentication from selected
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machines (like your development workstation, and the production server even more so), and preferably no explicit proxy at all JoshG says
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If the organization hasn t made it to the 90 s yet with its Internet connectivity, or only trusts its information technologists as far as it can kick them, you may have bigger problems than configuring your Rails app
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To connect through your proxy server by providing it additional credentials either by providing a URI:
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class Geocode < ActiveResource::Base selfsite = "http://mapsgooglecom/maps/api/geocode/json address=#{@address}" selfproxy = URI::HTTPbuild({:userinfo => 'apps:3x0du$', :host => 'proxymuppetssmackahost', :port => 3470}) end
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or using URI-style:
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class Geocode < ActiveResource::Base selfsite = "http://mapsgooglecom/maps/api/geocode/json address=#{@address}" selfproxy = 'http://apps:3x0du$@proxymuppetssmackahost:3470/' end
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1555 Authentication in the Web Service Controller
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On the other side of the connection, the RESTful service that our Active Resource model is consuming, we can use the authentication built-in to Rails:
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class MoneyTransferController < ApplicationController USER_NAME, PASSWORD = 'administrator', 'secret' #for example purpose only before_filter :authenticate def create @money_transfer = MoneyTransfernew(params[:money_transfer]) respond_to do |format| if @money_transfersave flash[:notice] = 'Money Transfer was successfully created' formathtml { redirect_to(@money_transfer) } formatxml { head :created, :location => @money_transfer } else formathtml { render :action => 'new' }
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formatxml { render :xml => @money_transfererrors, :status => :unprocessable_entity} end end end private def authenticate authenticate_or_request_with_http_basic do |user_name, password| user_name == USER_NAME && password == PASSWORD #a very simple authentication system with hard-coded username and password! Replace with a lookup into some repository end end end
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If the service is supporting HTTP Digest Authentication:
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class MoneyTransferController < ApplicationController USER_NAME, PASSWORD = 'administrator', 'secret' #for example purpose only USERS = { USER_NAME => Digest::MD5::hexdigest([USER_NAME, 'ExampleAuthenticationRealm', PASSWORD]join(":")) } #for example purpose only before_filter :authenticate def create @money_transfer = MoneyTransfernew(params[:money_transfer]) respond_to do |format| if @money_transfersave flash[:notice] = 'Money Transfer was successfully created' formathtml { redirect_to(@money_transfer) } formatxml { head :created, :location => @money_transfer } else formathtml { render :action => 'new' } formatxml { render :xml => @money_transfererrors, :status => :unprocessable_entity} end end end private def authenticate authenticate_or_request_with_http_digest do |user_name| USERS[user_name] #return HA1-style hashed password end end end
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The authenticate_or_request_with_http_digest method will first try to authenticate using a HA1-style digest password (which is what our example above uses) If that fails, it will attempt to hash a plain text password and match it against the hash in the request Initial authentication of client certificates is done by whatever in your HTTP stack that negotiates the SSL session (eg httpd, nginx), not in your Rails application Depending on your infrastructure technology, you may have access to additional environment variables like SSL_CLIENT_CERT, REMOTE_USER, X-HTTP_AUTHORIZATION These can be used for deeper authentication (eg, comparing a certificate s DN, email, and CN) and for authorization (to verify if an authenticated user is allowed to perform specific actions)
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In practice, the to_xml and from_xml methods meet the XML handling needs for most situations that the average Rails developer will ever encounter Their simplicity masks a great degree of flexibility and power, and in this chapter we attempted to explain them in sufficient detail to inspire your own exploration of XML handling in the Ruby world As a pair, the to_xml and from_xml methods also enabled the creation of a framework that makes tying Rails applications together using authenticated RESTful web services drop-dead easy That framework is named Active Resource, and this chapter gave you a crash-course introduction to it
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