2015-05-05 38 views
1

我想基於IP地址來保護我的REST API(jersey2),但沒有Spring Security等的麻煩。我只需要將被授予完全訪問權限的幾個IP列入白名單。使用來自application.properties的值初始化過濾器

爲了實現這個,我想到了將IP放入application.properties並使用過濾器強制實施限制。這在使用嵌入式Jetty服務器時非常合適,但在Tomcat上將應用程序部署爲war時會失敗。

我嘗試讀取Filter構造函數和init-method中的屬性(僅在代碼片段中顯示的構造函數示例)。然而,當訪問存儲IP的類字段(String ips)時,都會導致NullPointerException。同樣使用Enviroment變量似乎沒有幫助。

任何幫助表示讚賞。謝謝!

@Component("RestAuthFilter") 
public class RestAuthFilter implements Filter { 

    private String ips; 

    public RestAuthFilter() { 
     try { 
      final Properties p; 
      final InputStream input = Thread.currentThread().getContextClassLoader().getResourceAsStream("application.properties"); 
      p = new Properties(); 
      p.load(input); 
      ips = p.getProperty("whitelist.rest.ips"); 
     } catch(IOException e) { 
      ips = "127.0.0.1"; 
     } 
    } 

    @Override 
    public void init(final FilterConfig config) throws ServletException { 
    } 

    @Override 
    public void doFilter(final ServletRequest req, final ServletResponse res, 
        final FilterChain chain) throws ServletException,  IOException { 

     final List<String> allowedIPs = Arrays.asList(ips.split("[,]")); 

     if(!allowedIPs.contains(req.getRemoteAddr())) { 
      ((HttpServletResponse) res).setStatus(HttpServletResponse.SC_FORBIDDEN, "Not allowed to use REST API!"); 
     } else { 
      chain.doFilter(req, res); 
     } 
    } 

    @Override 
    public void destroy() { 
    } 

}

堆棧跟蹤:

java.lang.NullPointerException: null 
    at com.example.RestAuthFilter.doFilter(RestAuthFilter.java:44) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.springframework.boot.context.web.ErrorPageFilter.doFilter(ErrorPageFilter.java:113) 
    at org.springframework.boot.context.web.ErrorPageFilter.access$000(ErrorPageFilter.java:59) 
    at org.springframework.boot.context.web.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:88) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.springframework.boot.context.web.ErrorPageFilter.doFilter(ErrorPageFilter.java:106) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
    at java.lang.Thread.run(Thread.java:745) 
+1

請發佈錯誤的堆棧跟蹤。 – ChristofferPass

+0

您如何使用「環境變量」方法,以及將您的application.properties部署爲戰爭時位於何處? – ikumen

+0

@ user2264997 application.properties位於'src/main/resources /'下,因此也位於類路徑中。此文件還包含數據庫的憑據,似乎工作正常。關於環境變量,我指的是'org.springframework.core.env.Environment',我使用DI包含了類似'@Autowired Environment env'類的成員,並試圖使用相應的getProperties方法 – mailman

回答

1

既然你使用Spring引導和您的設置是非常標準的,我會堅持使用PropertySource(通過@Value或環境)來加載來自application.properties的IP。說了這麼多,並注意到您關於使用環境評論...

關於對環境變量我指的 org.springframework.core.env.Environment,這我包括使用DI, 像@ Autowired Environment env作爲類成員

您不能將它作爲類成員注入並在構造函數中進行初始化,您將遇到作用域問題 - 調用構造函數時不會設置環境。您需要通過構造函數注入環境而不是類成員,例如:

@Component("RestAuthFilter") 
public class RestAuthFilter implements Filter { 

    private final List<String> restClientIps; 

    @Autowired 
    public RestAuthFilter(Environment env) { 
    String restClientIpsProperty = env.getRequiredProperty("whitelist.rest.ips"); 
    restClientIps = // parse/split from restClientIpsProperty 
    } 
    ... 
}