Examples of org.apache.shiro.realm.Realm

org.apache.shiro.realm.Realm
kipedia.org/wiki/Data_Access_Object" target="_blank">DAOs.
Because most of these datasources usually contain Subject (a.k.a. User) information such as usernames and passwords, a Realm can act as a pluggable authentication module in a PAM configuration. This allows a Realm to perform both authentication and authorization duties for a single datasource, which caters to the large majority of applications. If for some reason you don't want your Realm implementation to perform authentication duties, you should override the {@link #supports(org.apache.shiro.authc.AuthenticationToken)} method to alwaysreturn false.
Because every application is different, security data such as users and roles can be represented in any number of ways. Shiro tries to maintain a non-intrusive development philosophy whenever possible - it does not require you to implement or extend any User, Group or Role interfaces or classes.
Instead, Shiro allows applications to implement this interface to access environment-specific datasources and data model objects. The implementation can then be plugged in to the application's Shiro configuration. This modular technique abstracts away any environment/modeling details and allows Shiro to be deployed in practically any application environment.
Most users will not implement the Realm interface directly, but will extend one of the subclasses, {@link org.apache.shiro.realm.AuthenticatingRealm AuthenticatingRealm} or {@link org.apache.shiro.realm.AuthorizingRealm}, greatly reducing the effort requird to implement a Realm from scratch.
@author Les Hazlewood @author Jeremy Haile @see org.apache.shiro.realm.CachingRealm CachingRealm @see org.apache.shiro.realm.AuthenticatingRealm AuthenticatingRealm @see org.apache.shiro.realm.AuthorizingRealm AuthorizingRealm @see org.apache.shiro.authc.pam.ModularRealmAuthenticator ModularRealmAuthenticator @since 0.1

        // temporarily disabled for preview to prevent confusion.
//        LocalAdminUserRealm localAdminRealm = new LocalAdminUserRealm("local-accounts");
//        localAdminRealm.setCredentialsMatcher(new HashedCredentialsMatcher("SHA2"));
//        setupLocalUser(api, localAdminRealm, app);


        Realm serverRestInterfaceRealm = injector.getInstance(ServerRestInterfaceRealm.class);
        final DefaultSecurityManager securityManager =
                new DefaultSecurityManager(
                        Lists.newArrayList(serverRestInterfaceRealm)
                );
        // disable storing sessions (TODO we might want to write a session store bridge to play's session cookie)

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        SecurityManager securityManager = createDefaultInstance();
        defaults.put(SECURITY_MANAGER_NAME, securityManager);


        if (shouldImplicitlyCreateRealm(ini)) {
            Realm realm = createRealm(ini);
            if (realm != null) {
                defaults.put(INI_REALM_NAME, realm);
            }
        }

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            Object value = entry.getValue();


            if (value instanceof RealmFactory) {
                addToRealms(realms, (RealmFactory) value);
            } else if (value instanceof Realm) {
                Realm realm = (Realm) value;
                //set the name if null:
                String existingName = realm.getName();
                if (existingName == null || existingName.startsWith(realm.getClass().getName())) {
                    if (realm instanceof Nameable) {
                        ((Nameable) realm).setName(name);
                        log.debug("Applied name '{}' to Nameable realm instance {}", name, realm);
                    } else {
                        log.info("Realm does not implement the {} interface.  Configured name will not be applied.",

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            throw new IllegalStateException(msg);
        }
        List<Realm> realms = new ArrayList<Realm>(jndiNames.size());
        for (String name : jndiNames) {
            try {
                Realm realm = (Realm) lookup(name, Realm.class);
                realms.add(realm);
            } catch (Exception e) {
                throw new IllegalStateException("Unable to look up realm with jndi name '" + name + "'.", e);
            }
        }

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        SecurityManager sm = factory.getInstance();
        assertNotNull(sm);
        assertTrue(sm instanceof DefaultSecurityManager);
        Collection<Realm> realms = ((DefaultSecurityManager) sm).getRealms();
        assertEquals(1, realms.size());
        Realm realm = realms.iterator().next();
        assertTrue(realm instanceof PropertiesRealm);
    }

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        SecurityManager sm = factory.getInstance();
        assertNotNull(sm);
        assertTrue(sm instanceof DefaultSecurityManager);
        Collection<Realm> realms = ((DefaultSecurityManager) sm).getRealms();
        assertEquals(1, realms.size());
        Realm realm = realms.iterator().next();
        assertTrue(realm instanceof IniRealm);
        assertTrue(((IniRealm) realm).accountExists("admin"));
    }

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        SecurityManager securityManager = createDefaultInstance();
        defaults.put(SECURITY_MANAGER_NAME, securityManager);


        if (shouldImplicitlyCreateRealm(ini)) {
            Realm realm = createRealm(ini);
            if (realm != null) {
                defaults.put(INI_REALM_NAME, realm);
            }
        }

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            Object value = entry.getValue();


            if (value instanceof RealmFactory) {
                addToRealms(realms, (RealmFactory) value);
            } else if (value instanceof Realm) {
                Realm realm = (Realm) value;
                //set the name if null:
                String existingName = realm.getName();
                if (existingName == null || existingName.startsWith(realm.getClass().getName())) {
                    if (realm instanceof Nameable) {
                        ((Nameable) realm).setName(name);
                        log.debug("Applied name '{}' to Nameable realm instance {}", name, realm);
                    } else {
                        log.info("Realm does not implement the {} interface.  Configured name will not be applied.",

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    return REALM_KEY_JDBC;
  }


  public Realm createRealm(){
    String key = getRealmKey();
    Realm realm = realms.get( key );
    if( realm == null ){
      log.error("Shiro Realm[{}]未实现！", key );
    }else{
      log.info("Shiro Realm[{}] 初始化完成！",key);
    }

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        SecurityManager securityManager = createDefaultInstance();
        defaults.put(SECURITY_MANAGER_NAME, securityManager);


        if (shouldImplicitlyCreateRealm(ini)) {
            Realm realm = createRealm(ini);
            if (realm != null) {
                defaults.put(INI_REALM_NAME, realm);
            }
        }

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