Getting Started with SimpleDB in Java

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2 Getting Started with SimpleDB
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Integrating with the Spring Security Framework
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User authentication is only one small part of the security picture Overall security for an application is complex and difficult to get right In the vast majority of cases, you integrate your code into a larger security framework rather than writing your own One popular Java security framework is Spring Security Spring Security is an open-source project and has been available for many years One of the benefits of using the Spring Security framework is that it can be used in many different contexts, whether you run it as a web application or as a web service, or from within a desktop client Spring Security itself is large and somewhat complex If you are not familiar with it already, getting it up and running is beyond the scope of this book However, the data model is modular, and you can integrate the data storage portion in isolation and use it with a bit of sample codeThe current list of supported back-end user data providers is quite extensive, but SimpleDB is not yet one of themTo create a SimpleDB user data provider for Spring Security, you need to create the following functionality:
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A user service that is able to load user data from SimpleDB A user class to hold the user data and user authorizations A feature to add and edit users
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Representing User Data
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The first thing you need is a way to represent the user dataThe things you need to store for each user are as follows:
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The username The user s password A flag indicating if the user is currently enabled A list of authorizations or roles associated with that user
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These elements can be stored together in a single class Listing 2-6 shows this within the User class
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Listing 2-6 Userjava Implementation of a User Authorization Class
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package comsimpledbbookuser; import javaio*; import javautil*; public class User implements Serializable { private String username; private String password; private boolean enabled; private List<String> authorities = new ArrayList<String>();
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Building a User Authentication Service
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public User(String u, String p, boolean en, List<String> au) { username = uintern(); password = pintern(); enabled = en; auget(0)charAt(0); for (String auth : new TreeSet<String>(au)) { authoritiesadd(authintern()); } } String getUsername() { return username; } String getPassword() { return password; } boolean isEnabled() { return enabled; } List<String> getAuthorities() { return authorities; } @Override public boolean equals(Object o) { if (o == null) return false; if (!(o instanceof User)) return false; User other = (User) o; if (otherusername != username) return false; if (otherpassword != password) return false; if (otherenabled != enabled) return false; if (!otherauthoritiesequals(authorities)) return false; return true; } @Override public int hashCode() { int prime = 37; int result = 23; result = result * prime + usernamehashCode(); result = result * prime + passwordhashCode(); result = result * prime + (enabled 1 : 0);
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2 Getting Started with SimpleDB
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for (String auth : authorities) { result = result * prime + authhashCode(); } return result; } }
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The User class exposes an immutable view of a user where the class responsible for the instantiation passes all the data into the constructor, and it never changesAt the top of the class, you can see that the four fields storing the data are private, with the public getter methods below them One thing that is important to note about this class is how the constructor verifies all the data fields to be non-nullThis ensures that all users of the class have completely valid and filled-out instances Each String passed into the constructor is stored only after it is internedThis returns a canonical representation of the String that is easier to compare for equality It also has the side effect of performing a check for null The list of Strings passed in with the name authorities is the set of roles the user has been grantedA TreeSet is used to remove duplicate entries and sort the remaining roles The call to intern() for each element in the set serves the same purpose as it did for the single String fields The class finishes up by declaring the equals() and hashcode() methods In order to uphold the general contract for equals() and hashcode(), equality and the hash code are computed using all four of the fields In addition, any time the equals method returns true for two instances, they will also return the same hash code
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