samples/bsh/src/dolda/bsvc/ShellPage.java

   1 package dolda.bsvc;
   2
   3 import dolda.jsvc.*;
   4 import dolda.jsvc.util.*;
   5 import dolda.jsvc.next.*;
   6 import org.w3c.dom.*;
   7 import java.io.*;
   8 import bsh.Interpreter;
   9
  10 public class ShellPage implements Responder {
  11     private Console cons = new Console();
  12     private Interpreter ip = new Interpreter(cons);
  13
  14     private static class Console implements bsh.ConsoleInterface {
  15         ByteArrayOutputStream obuf = new ByteArrayOutputStream();
  16         ByteArrayOutputStream ebuf = new ByteArrayOutputStream();
  17         Reader in = new StringReader("");
  18         PrintStream out;
  19         PrintStream err;
  20         {
  21             try {
  22                 out = new PrintStream(obuf, false, "UTF-8");
  23                 err = new PrintStream(ebuf, false, "UTF-8");
  24             } catch(UnsupportedEncodingException e) {
  25                 throw(new Error(e));
  26             }
  27         }
  28
  29         public void error(Object msg) {
  30             getErr().println(msg);
  31         }
  32
  33         public void print(Object o) {
  34             getOut().print(o);
  35         }
  36
  37         public void println(Object o) {
  38             getOut().println(o);
  39         }
  40
  41         public PrintStream getOut() {
  42             return(out);
  43         }
  44
  45         public PrintStream getErr() {
  46             return(err);
  47         }
  48
  49         public Reader getIn() {
  50             return(in);
  51         }
  52
  53         public void reset() {
  54             obuf.reset();
  55             ebuf.reset();
  56         }
  57     }
  58
  59     public void respond(Request req) {
  60         MultiMap<String, String> params = req.params();
  61         String cmd = params.get("cmd");
  62
  63         Html buf = Html.xhtml11("Shell");
  64         buf.addcss("css", null);
  65         buf.insert("body", buf.el("h1", buf.text("Shell")));
  66
  67         if((req.method() == "POST") && (cmd != null)) {
  68             String eo, ee;
  69             synchronized(cons) {
  70                 cons.reset();
  71                 Object resp;
  72                 try {
  73                     ip.set("req", req);
  74                     resp = ip.eval(cmd);
  75                     buf.insert("body", buf.el("pre", buf.text((resp == null)?"(null)":(resp.toString()))));
  76                 } catch(bsh.EvalError exc) {
  77                     buf.insert("body", buf.el("h2", buf.text("Evaluation error")));
  78                     buf.insert("body", buf.el("pre", buf.text(exc.toString())));
  79                     if(exc instanceof bsh.TargetError) {
  80                         bsh.TargetError te = (bsh.TargetError)exc;
  81                         buf.insert("body", buf.el("h3", buf.text("Target error")));
  82                         StringWriter sbuf = new StringWriter();
  83                         te.getTarget().printStackTrace(new PrintWriter(sbuf));
  84                         buf.insert("body", buf.el("pre", buf.text(sbuf.toString())));
  85                     }
  86                 }
  87                 eo = new String(cons.obuf.toByteArray(), Misc.utf8);
  88                 ee = new String(cons.ebuf.toByteArray(), Misc.utf8);
  89             }
  90             if(eo.length() > 0) {
  91                 buf.insert("body", buf.el("h2", buf.text("Output")));
  92                 buf.insert("body", buf.el("pre", buf.text(eo)));
  93             }
  94             if(ee.length() > 0) {
  95                 buf.insert("body", buf.el("h2", buf.text("Errors")));
  96                 buf.insert("body", buf.el("pre", buf.text(ee)));
  97             }
  98         }
  99
 100         Element form;
 101         buf.insert("body", buf.el("form", form = buf.el("p", null), "action=sh", "method=post"));
 102         form.appendChild(buf.el("textarea", buf.text(cmd), "cols=80", "rows=5", "name=cmd"));
 103         form.appendChild(buf.el("input", null, "type=submit", "value=Evaluate"));
 104         form.appendChild(buf.el("input", null, "type=reset", "value=Reset"));
 105         try {
 106             buf.output(req);
 107         } catch(IOException e) {
 108             throw(new RuntimeException(e));
 109         }
 110     }
 111 }