shiro的源码分析（一）

(一)//1、获取SecurityManager工厂，此处使用Ini配置文件初始化SecurityManager

Factory factory = new IniSecurityManagerFactory("classpath:shiro.ini")

2.factory类的类结构为：

(3)abstractFactory类主要设置是否单例

(4)iniFactorySupport是支持ini设置创建的对象

(5)iniSecuritymanagerFactory是ini方式创建securityManager的实现类

（二）//2、得到SecurityManager实例并绑定给SecurityUtils

org.apache.shiro.mgt.SecurityManagersecurityManager = factory.getInstance();

SecurityUtils.setSecurityManager(securityManager);

(1)通过创建的Ini对象创建Securitymanager对象

1  IniSecurityManagerFactory类：
2      creatSecuritymanager(ini){
3      SecurityManager securityManager = createSecurityManager(ini);
4      return securityManager;
5  }

(2)通过创建的Ini对象创建Securitymanager对象

 1 private SecurityManager createSecurityManager(Ini ini) {
 2 //null
 3 Ini.Section mainSection = ini.getSection(MAIN_SECTION_NAME);
 4 if (CollectionUtils.isEmpty(mainSection)) {
 5 
 6 //try the default: null
 7 mainSection = ini.getSection(Ini.DEFAULT_SECTION_NAME);
 8 }
 9  return createSecurityManager(ini, mainSection);
10  }

(3)通过ini对象和主模块mainSession创建Securitymanager

 1 private SecurityManager createSecurityManager(Ini ini, Ini.Section mainSection) {
 2 //{securityManager=DefaultSecurityManager,iniRealm=IniRealm}  
 3 Map defaults = createDefaults(ini, mainSection);
 4 Map objects = buildInstances(mainSection, defaults);
 5 
 6 SecurityManager securityManager = getSecurityManagerBean();
 7 boolean autoApplyRealms = isAutoApplyRealms(securityManager);
 8 if (autoApplyRealms) {
 9 //realms and realm factory might have been created - pull them out first  so we can initialize the securityManager:
10  Collection realms = getRealms(objects);
11  //set them on the SecurityManager
12  if (!CollectionUtils.isEmpty(realms)) {
13          applyRealmsToSecurityManager(realms, securityManager);
14            }
15         }
16        return securityManager;
17     }

(4)通过mainSession和默认object对象设置对象之间的关联

 1 private Map buildInstances(Ini.Section section, Map defaults) {
 2      this.builder = new ReflectionBuilder(defaults);
 3      return this.builder.buildObjects(section);
 4      ｝
 5 //类ReflectionBuilder
 6 //通过mainSection创建对象并关联
 7  public Map buildObjects(Map kvPairs) {
 8   .....
 9  LifecycleUtils.init(objects.values());
10 ｝

(5)因为IniRealm实现了Initializable,则初始化IniRealm对象

 1 //类IniRealm
 2 private void processDefinitions(Ini ini) {
 3  Ini.Section usersSection = ini.getSection(USERS_SECTION_NAME);
 4  processUserDefinitions(usersSection);
 5 }
 6 //通过userSection解析user模块
 7  protected void processUserDefinitions(Map userDefs) {
 8       for (String username : userDefs.keySet()) {
 9          ........
10       account = new SimpleAccount(username, password, getName());
11       add(account);
12         ........
13        }
14  ｝
15 protected void add(SimpleAccount account) {
16    String username = getUsername(account);
17    USERS_LOCK.writeLock().lock();
18    try {
19     this.users.put(username, account);
20    }finally {
21     USERS_LOCK.writeLock().unlock();
22 }

IniRealm的类结构为：

simpleAccount的结构为：

至此，创建对象关联，IniRealm的初始化完成！接下来看DefaultSecurityManager的结构图:

(7)设置DefaultSecurityManager的realm属性：

1  applyRealmsToSecurityManager(realms, securityManager)｛
2     ((RealmSecurityManager) securityManager).setRealms(realms);
3 ｝
4 //在类RealmSecurityManager中
5 public void setRealms(Collection realms) {
6    this.realms = realms;
7    afterRealmsSet();
8 ｝

注意：afterRealmsSet();主要用来设置authenticator、authorizer的realm属性：

至此DefaultSecurityManager的属性设置完成、并返回DefaultSecurityManager对象

//3、得到Subject及创建用户名/密码身份验证Token（即用户身份/凭证）

Subject subject = SecurityUtils.getSubject();

1 //获取主题对象 
2 public static Subject getSubject() {
3     Subject subject = ThreadContext.getSubject();//第一次null
4     if (subject == null) {
5        subject = (new Subject.Builder()).buildSubject();
6        ThreadContext.bind(subject);
7         }
8       return subject;
9 }

(1)代码分析：使用建造者模式创建对象：

 1 public static class Builder｛
 2        SubjectContext subjectContext;
 3        SecurityManager securityManager;
 4         public Builder(SecurityManager securityManager) {
 5             if (securityManager == null) {
 6                 throw new NullPointerException("SecurityManager method argument cannot be null.");
 7             }
 8             this.securityManager = securityManager;
 9             this.subjectContext = newSubjectContextInstance();//DefaultSubjectContext（初始化一个backMap集合）
10             if (this.subjectContext == null) {
11                 throw new IllegalStateException("Subject instance returned from 'newSubjectContextInstance' " +
12                         "cannot be null.");
13             }
14             this.subjectContext.setSecurityManager(securityManager);
15         }
16        public Subject buildSubject() {
17             return this.securityManager.createSubject(this.subjectContext);
18         }
19 ｝

(2)使用主题上下文创建主题

 1   public Subject createSubject(SubjectContext subjectContext) {
 2         //create a copy so we don't modify the argument's backing map:
 3         SubjectContext context = copy(subjectContext);
 4 
 5         //ensure that the context has a SecurityManager instance, and if not, add one:
 6         context = ensureSecurityManager(context);//DefaultSubjectContext.backMap.put(SecurityManage)
 7 
 8         //Resolve an associated Session (usually based on a referenced session ID), and place it in the context before
 9         //sending to the SubjectFactory.  The SubjectFactory should not need to know how to acquire sessions as the
10         //process is often environment specific - better to shield the SF from these details:
11         context = resolveSession(context);
12 
13         //Similarly, the SubjectFactory should not require any concept of RememberMe - translate that here first
14         //if possible before handing off to the SubjectFactory:
15         context = resolvePrincipals(context);
16 
17         Subject subject = doCreateSubject(context);
18 
19         //save this subject for future reference if necessary:
20         //(this is needed here in case rememberMe principals were resolved and they need to be stored in the
21         //session, so we don't constantly rehydrate the rememberMe PrincipalCollection on every operation).
22         //Added in 1.2:
23         save(subject);
24 
25         return subject;
26     }

(3)通过主题创建subject对象

 protected Subject doCreateSubject(SubjectContext context) {
        return getSubjectFactory().createSubject(context);
    }

(4)DefaultSubjectFactory创建主题对象：

 1    public Subject createSubject(SubjectContext context) {
 2         SecurityManager securityManager = context.resolveSecurityManager();
 3         Session session = context.resolveSession();
 4         boolean sessionCreationEnabled = context.isSessionCreationEnabled();
 5         PrincipalCollection principals = context.resolvePrincipals();
 6         boolean authenticated = context.resolveAuthenticated();
 7         String host = context.resolveHost();
 8
 9         return new DelegatingSubject(principals, authenticated, host, session, sessionCreationEnabled, securityManager);
10     }

到些sujbect对象创建完成，并把sujbect绑定到保存到本地变量和线程

UsernamePasswordToken token = new UsernamePasswordToken("zhang", "123");

//4、登录，即身份验证
subject.login(token);

(1)通过token登录.token失败，则抛出异常

 public void login(AuthenticationToken token) throws AuthenticationException {
......
 Subject subject = securityManager.login(this, token);
......
}
//在DefaultSecurityManager中
  public Subject login(Subject subject, AuthenticationToken token) 
  throws AuthenticationException {
  try{AuthenticationInfo info = authenticate(token);}catch{...}
  Subject loggedIn = createSubject(token, info, subject);
  onSuccessfulLogin(token, info, loggedIn);
  return loggedIn;
}

(2)多模块身份验证器类验证token(之前realm被设置于ModularRealmAuthenticator,只有一个iniRealm，故执行doSingleRealmAuthentication）

protected AuthenticationInfo doSingleRealmAuthentication(Realm realm, AuthenticationToken token) {
        if (!realm.supports(token)) {
            String msg = "Realm [" + realm + "] does not support authentication token [" +
                    token + "].  Please ensure that the appropriate Realm implementation is " +
                    "configured correctly or that the realm accepts AuthenticationTokens of this type.";
            throw new UnsupportedTokenException(msg);
        }
        AuthenticationInfo info = realm.getAuthenticationInfo(token);
        if (info == null) {
            String msg = "Realm [" + realm + "] was unable to find account data for the " +
                    "submitted AuthenticationToken [" + token + "].";
            throw new UnknownAccountException(msg);
        }
        return info;
    }

(3)通过realm身份验证：

JAVA学习网

分类

shiro的源码分析（一）