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Parsing service responses can range from an easy task to a difficult task, depending on how much data is returned While there are multiple options for parsing XML in Ruby, Nokogiri is currently the leading option in terms of speed and ease of use When writing classes to parse service responses, there are a some key points to follow in designing classes: Keep parsing logic separate from object logic, preferably within a single method Use multiple classes for data Don t try to put everything into a single class Make object constructors that take standard Ruby objects and not unparsed strings Following these guidelines when designing classes to wrap service responses results it more readable and maintainable code These guidelines also apply to writing classes that make SOAP calls Parsing, request, and SOAP logic should be handled within the class Data objects should be returned from the class that show through a clear API what data a response contains
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C HAPTER 10 Security
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There are three main areas of focus when securing services: authentication, authorization, and encryption Authentication refers to verifying that the user is who she says she is and that no one has tampered with her message Authorization refers to determining what a given user is allowed to do on the system Encryption is a technique to keep people in the middle from being able to know what data is being sent back and forth All three are important to properly securing a system, but each is approached in a different way This chapter covers how to approach each of these facets of security to ensure that your services are not compromised
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There are two main components to authentication The first is validating a user s identity The second is ensuring that the message the server received is the same message the client sent The simplest form of user authentication is to require the user to provide a user name and password This ensures that the user knows at least a valid login and its associated password, but it does little to guarantee that the message body the server received is the same as the one that the client sent Message signing provides a more foolproof mechanism for validating that message contents have arrived unmodified In addition, message signing can be used to validate a user s identity because the signing mechanism can also be used to uniquely identify a user This section starts with simple HTTP authentication to validate a user s identity and then moves on to two forms of message signing: shared secrets and public/private
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key pairs It finishes with a quick look at using SSL certificates to validate the identity of a server While reading this section, remember that passwords and message signing do not have to be used exclusively, and greater security can be attained by requiring both HTTP authentication and a signed message
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HTTP Authentication
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One of the simplest ways of verifying the identity of a user is to use HTTP basic authentication, which is a simple challenge-and-response method that requires the user to provide a user name and password On the client side, basic authentication is usually very easy to implement In Typhoeus, it s as easy as adding an authorization header, like so:
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require 'base64' credentials = Base64encode64("#{username}:#{password}") response = Typhoeus::Requestget( "http://examplecom/cooljson", :headers => {"Authorization" => "Basic #{credentials}"})
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Thankfully, the work on the server side is nearly as simple Rack ships with the
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Rack::Auth::Basic class, which is Rack middleware that you initialize with an
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authentication realm and authentication block, like so:
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Filename: lib/protected_appru require 'protected_app' use Rack::Auth::Basic, "Protected Realm" do |username, password| # You could make a request to a user service here to # see if the user is correct # For apps that are not externally accessible, # it's sometimes easier (though not quite as secure) # to just have a standard user/pass: username == "bobs_protection" && password = "bobs_sekret_pass" end run ProtectedAppnew
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