6 import javax.servlet.*;
7 import javax.servlet.http.*;
9 import org.ibex.util.*;
10 import org.ibex.util.Collections;
13 import org.prevayler.*;
14 import org.prevayler.implementation.snapshot.*;
16 public class Servlet extends HttpServlet {
19 private Prevayler prevayler;
21 private ServletContext cx = null;
23 public void destroy() { try {
24 synchronized(this.getClass()) {
25 Prevayler privatePrevayler = prevayler;
26 if (prevayler == null) return;
28 Prevalence.destroy(cx, prevayler);
30 } catch (Exception e) { e.printStackTrace(); } }
32 public void init(ServletConfig sc) throws ServletException {
33 cx = sc.getServletContext();
34 prevayler = Prevalence.getPrevayler(cx);
35 prevalent = (JS)prevayler.prevalentSystem();
38 public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException { doGet(request, response); }
39 public void doGet(HttpServletRequest rq, HttpServletResponse rs) throws IOException {
40 String path = cx.getRealPath(rq.getServletPath());
41 Servlet.Scope scope = new Servlet.Scope(cx, rq, rs, prevayler);
42 rs.getWriter().write("beginning output...");
43 try { Template.wrap(Template.parse(path, scope), scope).out(rs.getWriter()); }
44 catch (Exception e) { e.printStackTrace(); System.out.println("e = "+e); }
45 rs.getWriter().write("...output ends.");
48 public static class Scope extends Template.Scope {
49 private final ServletContext cx;
50 private final HttpServletRequest request;
51 private final HttpServletResponse response;
52 private final Prevayler prevayler;
54 public Scope(ServletContext cx, HttpServletRequest rq, HttpServletResponse rs, Prevayler p) {
55 super(null); this.cx = cx; request = rq; response = rs; prevayler = p;
58 public String getLocalPath() { return cx.getRealPath("/") + "/WEB-INF/"; }
59 public void transaction(JS t) {
60 try { prevayler.execute(new Prevalence.JSTransaction(t)); }
61 catch (Exception e) { e.printStackTrace(); throw new RuntimeException(e); }
64 private JS params = new JS() {
65 private List keys = null;
66 public Object get(Object key) { return request.getParameter(JS.toString(key)); }
67 public Collection keys() {
68 return keys == null ? keys = Collections.list(request.getParameterNames()) : keys; }
70 private JS cookies = new JS() {
72 public Object get(Object key) { return request.getCookie(JS.toString(key)); }
73 public Enumeration keys() { return request.getCookieNames(); }
76 private JS sessionAttributes = new JS() {
77 private List keys = null;
78 public Object get(Object key) {
79 return request.getSession(true).getAttribute(JS.toString(key)); }
80 public void put(Object key, Object val) {
81 if (val == null) request.getSession(true).removeAttribute(JS.toString(key));
82 else request.setAttribute(JS.toString(key), val); }
83 public Collection keys() {
84 return keys == null ? keys = Collections.list(request.getSession(true).getAttributeNames()) : keys; }
86 private JS requestHeader = new JS() {
87 private List keys = null;
88 public Object get(Object key) { return request.getHeader(JS.toString(key)); }
89 public Collection keys() {
90 return keys == null ? keys = Collections.list(request.getHeaderNames()) : keys; }
92 private JS responseHeader = new JS() {
93 public void put(Object key, Object val) {
94 response.setHeader(JS.toString(key), JS.toString(val)); }
98 /** lets us put multi-level get/put/call keys all in the same method */
99 private class Sub extends JS {
101 Sub(Object key) { this.key = key; }
102 public void put(Object key, Object val) throws JSExn {
103 Scope.this.put(JS.toString(this.key) + "." + JS.toString(key), val); }
104 public Object get(Object key) throws JSExn {
105 return Scope.this.get(JS.toString(this.key) + "." + JS.toString(key)); }
106 public Object call(Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
107 return Scope.this.callMethod(this.key, a0, a1, a2, rest, nargs);
109 public Object callMethod(Object method, Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
110 return Scope.this.callMethod(JS.toString(this.key) + "."
111 + JS.toString(method), a0, a1, a2, rest, nargs);
114 private Sub getSub(String key) { return new Sub(key); }
116 public Object callMethod(Object method, final Object a, final Object b, Object c, Object[] rest, int nargs) throws JSExn {
118 case "session.invalidate": request.getSession(true).invalidate(); return null;
120 String path = JS.toString(a);
121 if (path.indexOf("..") != -1) throw new JSExn("cannot use .. in paths");
122 File f = new File(cx.getRealPath("/") + File.separatorChar + path);
123 if (!f.isDirectory()) return null;
124 String[] contents = f.list();
125 JSArray ret = new JSArray(contents.length);
126 for(int i=0; i<contents.length; i++) ret.add(contents[i]);
131 public Object get(Object key) throws JSExn {
134 case "arg": return null;
135 case "prevalent": return prevayler.prevalentSystem();
136 case "request": return getSub("request");
137 case "request.user": return request.getRemoteUser();
138 case "request.header": return requestHeader;
139 case "request.method": return request.getMethod();
140 case "request.remote": return getSub("request.remote");
141 case "request.remote.ip": return request.getRemoteAddr();
142 case "request.remote.host": return request.getRemoteHost();
143 case "request.ssl": return new Boolean(request.isSecure());
144 case "request.path": return request.getPathInfo();
145 case "response": return getSub("response");
146 case "response.header": return responseHeader;
147 case "session": return getSub("session");
148 case "session.attr": return sessionAttributes;
149 case "session.created": return new JSDate(request.getSession(true).getCreationTime());
150 case "session.accessed": return new JSDate(request.getSession(true).getLastAccessedTime());
151 case "session.invalidate": return METHOD;
152 case "page": return getSub("page");
153 //case "page.lastmodified": return new JSDate(new File(path).lastModified()); FIXME
154 case "context": return getSub("context");
155 case "context.list": return METHOD;
156 case "params": return params;
157 case "cookie": return cookies;
158 case "xt.date": return new JSDate(); // TODO: discuss
162 public void put(Object key, Object val) throws JSExn {
164 //#switch(JS.toString(key))
165 case "transaction": transaction((JS)val);
166 case "response.code": response.setStatus(JS.toInt(val));
167 case "response.redirect": response.sendRedirect(JS.toString(val));
168 case "response.contentType": response.setContentType(JS.toString(val));
170 } catch (IOException e) {