如何从 Eclipse 插件提供 Flash 策略文件？
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【中文标题】如何从 Eclipse 插件提供 Flash 策略文件？【英文标题】：How do I serve Flash policy files from an Eclipse plugin? 【发布时间】：2012-11-26 05:02:22 【问题描述】：我有一个 Eclipse 插件，它需要为在本地机器上运行的 Flash 应用程序打开一对套接字。 Flash 需要一个策略文件（XML 块）来授予访问相关端口的权限。 Flash 更喜欢通过端口 843 获取此策略文件，Java 将端口
/**
* Connecting to some port to communicate with the debugger. We initiate the
* connection because Flex doesn't allow us to listen to any ports.
*/
private function initSockets():void
requestSocket = new Socket();
requestSocket.addEventListener(Event.CONNECT, requestConnected);
requestSocket.addEventListener(Event.CLOSE, closed);
requestSocket.addEventListener(ProgressEvent.SOCKET_DATA, processRequestData);
requestSocket.addEventListener(IOErrorEvent.IO_ERROR, ioError);
requestSocket.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityError);
requestSocket.connect("localhost", SCConstants.DEBUG_LESSON_REQUEST_PORT);
eventSocket = new Socket();
eventSocket.addEventListener(Event.CONNECT, eventConnected);
eventSocket.addEventListener(Event.CLOSE, closed);
eventSocket.addEventListener(ProgressEvent.SOCKET_DATA, processEventData);
eventSocket.addEventListener(IOErrorEvent.IO_ERROR, ioError);
eventSocket.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityError);
eventSocket.connect("localhost", SCConstants.DEBUG_LESSON_EVENT_PORT);
在 Eclipse 插件方面，我继承了一些大部分时间都可以在 OS X 上运行，但有时在 Windows 上会失败的代码。在 Wi-Fi 而不是有线以太网上运行也往往会失败，尽管我不知道为什么这很重要。
public Boolean connect() throws DebugException
try
try
// connection code
fRequestServerSocket = new ServerSocket(requestPort);
fRequestServerSocket.setSoTimeout(ACCEPT_TIMEOUT);
fEventServerSocket = new ServerSocket(eventPort);
fEventServerSocket.setSoTimeout(ACCEPT_TIMEOUT);
TWBLogger.logInfo("Open socket request server:" + fRequestServerSocket);
TWBLogger.logInfo("Open socket event server:" + fEventServerSocket);
String policy = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
"<cross-domain-policy>\n" +
"<allow-access-from domain=\"*\" to-ports=\"5000,5001\" secure=\"false\" />\n" +
"</cross-domain-policy>\0";
// Because of the Flash security policy the first thing
// that will accept on the socket will be the Flash Player
// trying to verify us. The Flash player will request security
// policy file with the following string: <policy-file-request/>\0
// We will serve back the above policy file and then close the socket
// The next thing to accept is our process in the VM.
fRequestSocket = fRequestServerSocket.accept();
fRequestWriter = new PrintWriter(fRequestSocket.getOutputStream());
fRequestReader = new BufferedReader(new InputStreamReader(fRequestSocket.getInputStream()));
// Wait some time before giving flash the policy file. Otherwise they don't get it. ;(
// 3 is too much ... ;(
Thread.sleep(100);
fRequestWriter.print(policy);
fRequestWriter.flush();
fRequestSocket.close();
// this should be the real connection
fRequestSocket = fRequestServerSocket.accept();
TWBLogger.logInfo("Open socket request:" + fRequestSocket);
fRequestWriter = new PrintWriter(fRequestSocket.getOutputStream());
fRequestReader = new BufferedReader(new InputStreamReader(fRequestSocket.getInputStream()));
// the same situation for the EventSocket
fEventSocket = fEventServerSocket.accept();
fEventReader = new BufferedReader(new InputStreamReader(fEventSocket.getInputStream()));
TWBLogger.logInfo("Open socket event:" + fEventSocket);
catch (SocketTimeoutException e)
TWBLogger.logWaring("Connection to the Client Timed out.");
cleanSockets();
return false;
requestFailed("Connection to the VM timed out. Please close any other running lessons that you debug and try again", e);
catch (SocketSecurityException e)
requestFailed("Security error occured when connecting to the VM", e);
catch (Exception e)
if (!fTerminated)
requestFailed("Error occured when connecting to the VM. Please close any other running lessons that you debug.", e);
catch (DebugException e)
// close the sockets so that we can debug another application
cleanSockets();
throw e;
// our VM is single threaded
fThread = new TWBThread(this);
fThreads = new IThread[] fThread;
// start listening for events from the VM
fEventDispatch = new EventDispatchJob();
fEventDispatch.schedule();
// start listening for breakpoints
IBreakpointManager breakpointManager = getBreakpointManager();
breakpointManager.addBreakpointListener(this);
breakpointManager.addBreakpointManagerListener(this);
return true;
这段代码看起来不对。它不等待来自 Flash 的消息，而只是将策略响应塞入端口。正如我所说，它大部分时间都可以工作，但有时会失败并且似乎不符合 Adobe 的文档。
我尝试在每个端口上侦听请求数据包并发送特定于端口的响应。我在环回接口 (Mac OS X) 上使用 WireShark 观察了套接字流量。我看到收到了策略请求并发送了响应，但 Flash 仍然在两个端口上都给了我安全沙盒违规。
我也尝试在上面显示的 initSockets 开头添加这一行：
Security.loadPolicyFile("xmlsocket://localhost:5002");
然后我在插件中添加了代码来监听端口 5002 并发送以下主策略文件内容：
private final static String FLASH_POLICY_RESPONSE =
"<?xml version=\"1.0\"?>\n" +
"<!DOCTYPE cross-domain-policy SYSTEM \"/xml/dtds/cross-domain-policy.dtd\">\n" +
"<cross-domain-policy>\n" +
"<site-control permitted-cross-domain-policies=\"master-only\"/>\n" +
"<allow-access-from domain=\"*\" to-ports=\"5000,5001\"/>\n" +
"</cross-domain-policy>\0";
我再次看到请求进来和响应出去，但 Flash 似乎没有响应它。我没有收到 Security Sandbox Violation 错误，但端口上也没有流量。
谁能告诉我在 Java 和 Flash 之间打开套接字的正确方法？
【问题讨论】：
【参考方案1】：我找到了解决方案。我很早就犯了一个错误，并使用BufferedReader.readLine 来阅读策略请求。这是不合适的，因为策略请求是空终止的，而不是新行终止的。这很令人困惑，因为它会在底层流关闭时返回。因此我收到了请求并发送了响应，但是在 ActionScript 代码已经确定请求失败之后才发送响应。
在 Java 端，我使用以下代码在端口上建立通信：
// Create server sockets.
fRequestServerSocket = new ServerSocket(REQUEST_PORT);
fRequestServerSocket.setSoTimeout(ACCEPT_TIMEOUT);
TWBLogger.logInfo("Open socket request server:" + fRequestServerSocket);
fEventServerSocket = new ServerSocket(EVENT_PORT);
fEventServerSocket.setSoTimeout(ACCEPT_TIMEOUT);
TWBLogger.logInfo("Open socket event server:" + fEventServerSocket);
// Serve up the Flash policy file.
serveFlashPolicy();
// Connect request socket.
fRequestSocket = fRequestServerSocket.accept();
TWBLogger.logInfo("Open socket request:" + fRequestSocket);
fRequestWriter = new PrintWriter(fRequestSocket.getOutputStream());
fRequestReader = new BufferedReader(new InputStreamReader(fRequestSocket.getInputStream()));
// Connect event socket.
fEventSocket = fEventServerSocket.accept();
TWBLogger.logInfo("Open socket event:" + fEventSocket);
fEventReader = new BufferedReader(new InputStreamReader(fEventSocket.getInputStream()));
提供策略文件的处理如下：
private void serveFlashPolicy()
ServerSocket serverSocket = null;
Socket socket = null;
TWBLogger.logInfo("Waiting for flash policy request on port " + FLASH_POLICY_PORT);
try
serverSocket = new ServerSocket(FLASH_POLICY_PORT);
serverSocket.setSoTimeout(ACCEPT_TIMEOUT);
socket = serverSocket.accept();
PrintWriter writer = new PrintWriter(socket.getOutputStream());
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
StringBuilder request = new StringBuilder();
int c;
while (0 < (c = reader.read()))
request.append((char) c);
String policyRequest = request.toString();
if (policyRequest.startsWith(FLASH_POLICY_REQUEST))
writer.print(FLASH_POLICY_RESPONSE);
writer.print("\0");
writer.flush();
catch (IOException e)
TWBLogger.logWaring("IOException on port " + FLASH_POLICY_PORT + ": " + e.toString());
e.printStackTrace();
finally
if (null != socket)
try
socket.close();
catch (Exception e)
// Ignore
if (null != serverSocket)
try
serverSocket.close();
catch (Exception e)
// Ignore
TWBLogger.logInfo("Flash policy complete on port " + FLASH_POLICY_PORT);
Flash 政策响应如下所示：
private final static String FLASH_POLICY_RESPONSE =
"<?xml version=\"1.0\"?>\n" +
"<!DOCTYPE cross-domain-policy SYSTEM \"/xml/dtds/cross-domain-policy.dtd\">\n" +
"<cross-domain-policy>\n" +
"<allow-access-from domain=\"*\" to-ports=\"5000,5001\"/>\n" +
"</cross-domain-policy>";
我之前发送的site-control 标签只允许在从端口 843 提供的主策略文件中。
【讨论】：
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