def encrypt_password encrypted_password = encrypt(password) end in Java

Drawing Data Matrix in Java def encrypt_password encrypted_password = encrypt(password) end
def encrypt_password encrypted_password = encrypt(password) end
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Ruby would create a local variable called encrypted_password, which isn t what we want at all
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4 Ruby has a closely related keyword called protected that differs subtly from private As far as I can tell, the only reason to learn the difference is so that you can ace a job interview that asks you In Ruby, what is the difference between private and protected But do you really want to work at a company that asks you such a lame interview question At his keynote at RubyConf in 2008, Dave Thomas (author of Programming Ruby) suggested eliminating protected from future versions of Ruby, and I agree with the sentiment Just use private and you ll be fine
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7: Modeling and Viewing Users, Part II
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Second, the right-hand side of the assignment calls encrypt on password, but there is no password in sight In the console, we would access the password attribute through a user object
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>> user = Usernew(:password => "foobar") >> userpassword => "foobar"
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Inside the User class, the user object is just self, and we could write
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def encrypt_password selfencrypted_password = encrypt(selfpassword) end
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in analogy with the console example, just replacing user with self But the self is optional, so for brevity we can write simply
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def encrypt_password selfencrypted_password = encrypt(password) end
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as in Listing 76 above (Of course, as we ve noted, the self is not optional when assigning to an attribute, so we have to write selfencrypted_password in this case)
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72 Secure Passwords
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With the code from Section 71, in principle we are done: although the encrypted password is the same as the unencrypted password, as long as we are willing to store unencrypted passwords in the database we have the necessary foundation for user login and authentication5 Our standards in Rails Tutorial are much loftier, though: any web developer worth his salt should know how to implement a password system with secure one-way hashing In this section, we will build on the material from Section 71 to implement just such an industrial-strength password system
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5 I am ashamed to admit that this is how we implemented passwords in RailsSpace Consider this section my penance
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Secure Passwords
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721 A Secure Password Test
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As hinted at in Section 713, all of the machinery for password encryption will be tucked away in the private regions of the User model, which presents a challenge for testing it What we need is some sort of public interface that we can expose to the rest of the application One useful aspect of test-driven development is that, by acting as a client for our application code, the tests motivate us to design a useful interface right from the start Authenticating users involves comparing the encrypted version of a submitted password to the (encrypted) password of a given user This means we need to define some method to perform the comparison, which we ll call has_password ; this will be our public interface to the encryption machinery6 The has_password method will test whether a user has the same password as one submitted on a sign-in form (to be written in 9); a skeleton method for has_password appears in Listing 77
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Listing 77 A has_password method for users
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app/models/userrb
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class User < ActiveRecord::Base before_save :encrypt_password # Return true if the user's password matches the submitted password def has_password (submitted_password) # Compare encrypted_password with the encrypted version of # submitted_password end private end
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6 The alert reader may notice that none of what we do in this section requires encryption, but, once we develop some of the theory of secure passwords and write a basic implementation (Section 722), the only way for the has_password method to work properly is for all the encryption machinery to work properly as well
7: Modeling and Viewing Users, Part II
With this method, we can write tests as in Listing 78, which uses the RSpec methods
be_true and be_false to test that has_password returns true or false in the
proper cases
Listing 78 Tests for the has_password method
spec/models/user_specrb
describe User describe "password encryption" do before(:each) do @user = Usercreate!(@attr) end describe "has_password method" do it "should be true if the passwords match" do @userhas_password (@attr[:password])should be_true end it "should be false if the passwords don't match" do @userhas_password ("invalid")should be_false end end end end
In Section 723, we ll complete the implementation of has_password (and get the test to pass in the process) But first we need to learn a little more about secure passwords