Created
September 13, 2016 20:35
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public class PrintRequestServlet extends HttpServlet { | |
@Override | |
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { | |
PrintWriter out = resp.getWriter(); | |
out.println("<b>HTTP Headers</b><br/>"); | |
Enumeration<?> headers = req.getHeaderNames(); | |
for (;;) { | |
if (!headers.hasMoreElements()) { | |
break; | |
} | |
String nextHeader = (String) headers.nextElement(); | |
out.print(nextHeader + " = " + req.getHeader(nextHeader) + "<br/>"); | |
} | |
out.println("<b>Attributes</b><br/>"); | |
Enumeration<?> attributes = req.getAttributeNames(); | |
for (;;) { | |
if (!attributes.hasMoreElements()) | |
break; | |
String nextAttribute = (String) attributes.nextElement(); | |
out.print(nextAttribute + " = " + req.getAttribute(nextAttribute) + "<br/>"); | |
} | |
try { | |
out.println("REMOTE_USER = " + req.getRemoteUser() + "<br/>"); | |
} catch (Exception e) { | |
out.print("REMOTE_USER is not set<br/>"); | |
} | |
out.println("groups = " + getUserGroups(req.getRemoteUser())); | |
} | |
private String getUserGroups(String username) { | |
ProcessBuilder pb = new ProcessBuilder("groups", username); | |
pb.redirectErrorStream(true); | |
String groups = null; | |
try { | |
Process p = pb.start(); | |
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream())); | |
String line; | |
while ((line = in.readLine()) != null) { | |
groups = line; | |
} | |
p.waitFor(); | |
in.close(); | |
} catch (Exception e) { | |
throw new RuntimeException(e); | |
} | |
return groups; | |
} | |
} |
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