shiro源码的详细介绍

(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 SecurityManager12  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null4     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 the10         //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 first14         //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 the21         //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     }

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