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 session = new JS() {
65 public Object get(Object key) throws JSExn {
66 //#switch(JS.toString(key))
67 case "created": return new JSDate(request.getSession(true).getCreationTime());
68 case "accessed": return new JSDate(request.getSession(true).getLastAccessedTime());
69 case "invalidate": return METHOD;
71 return super.get(key);
73 public void put(Object key, Object val) throws JSExn {
74 //#switch(JS.toString(key))
75 case "created": throw new JSExn("can not set session.created");
76 case "accessed": throw new JSExn("can not set session.accessed");
77 case "invalidate": throw new JSExn("can not set session.invalidate");
81 public Object callMethod(Object method, final Object a, final Object b, Object c, Object[] rest, int nargs)
83 //#switch(JS.toString(method))
84 case "invalidate": request.getSession(true).invalidate(); return null;
86 return super.callMethod(method, a, b, c, rest, nargs);
89 private JS params = new JS() {
90 private List keys = null;
91 public Object get(Object key) { return request.getParameter(JS.toString(key)); }
92 public Collection keys() {
93 return keys == null ? keys = Collections.list(request.getParameterNames()) : keys; }
95 private JS cookies = new JS() {
97 public Object get(Object key) { return request.getCookie(JS.toString(key)); }
98 public Enumeration keys() { return request.getCookieNames(); }
101 private JS sessionAttributes = new JS() {
102 private List keys = null;
103 public Object get(Object key) {
104 return request.getSession(true).getAttribute(JS.toString(key)); }
105 public void put(Object key, Object val) {
106 if (val == null) request.getSession(true).removeAttribute(JS.toString(key));
107 else request.setAttribute(JS.toString(key), val); }
108 public Collection keys() {
109 return keys == null ? keys = Collections.list(request.getSession(true).getAttributeNames()) : keys; }
111 private JS requestHeader = new JS() {
112 private List keys = null;
113 public Object get(Object key) { return request.getHeader(JS.toString(key)); }
114 public Collection keys() {
115 return keys == null ? keys = Collections.list(request.getHeaderNames()) : keys; }
117 private JS responseHeader = new JS() {
118 public void put(Object key, Object val) {
119 response.setHeader(JS.toString(key), JS.toString(val)); }
123 /** lets us put multi-level get/put/call keys all in the same method */
124 private class Sub extends JS {
126 Sub(Object key) { this.key = key; }
127 public void put(Object key, Object val) throws JSExn {
128 Scope.this.put(JS.toString(this.key) + "." + JS.toString(key), val); }
129 public Object get(Object key) throws JSExn {
130 return Scope.this.get(JS.toString(this.key) + "." + JS.toString(key)); }
131 public Object call(Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
132 return Scope.this.callMethod(this.key, a0, a1, a2, rest, nargs);
134 public Object callMethod(Object method, Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
135 return Scope.this.callMethod(JS.toString(this.key) + "."
136 + JS.toString(method), a0, a1, a2, rest, nargs);
139 private Sub getSub(String key) { return new Sub(key); }
141 public Object callMethod(Object method, final Object a, final Object b, Object c, Object[] rest, int nargs) throws JSExn {
143 case "session.invalidate": request.getSession(true).invalidate(); return null;
145 String path = JS.toString(a);
146 if (path.indexOf("..") != -1) throw new JSExn("cannot use .. in paths");
147 File f = new File(cx.getRealPath("/") + File.separatorChar + path);
148 if (!f.isDirectory()) return null;
149 String[] contents = f.list();
150 JSArray ret = new JSArray(contents.length);
151 for(int i=0; i<contents.length; i++) ret.add(contents[i]);
156 public Object get(Object key) throws JSExn {
159 case "arg": return null;
160 case "prevalent": return prevayler.prevalentSystem();
161 case "request": return getSub("request");
162 case "request.user": return request.getRemoteUser();
163 case "request.header": return requestHeader;
164 case "request.method": return request.getMethod();
165 case "request.remote": return getSub("request.remote");
166 case "request.remote.ip": return request.getRemoteAddr();
167 case "request.remote.host": return request.getRemoteHost();
168 case "request.ssl": return new Boolean(request.isSecure());
169 case "request.path": return request.getPathInfo();
170 case "response": return getSub("response");
171 case "response.header": return responseHeader;
172 case "session": return session;
173 case "page": return getSub("page");
174 //case "page.lastmodified": return new JSDate(new File(path).lastModified()); FIXME
175 case "context": return getSub("context");
176 case "context.list": return METHOD;
177 case "params": return params;
178 case "cookie": return cookies;
179 case "xt.date": return new JSDate(); // TODO: discuss
183 public void put(Object key, Object val) throws JSExn {
185 //#switch(JS.toString(key))
186 case "transaction": transaction((JS)val);
187 case "response.code": response.setStatus(JS.toInt(val));
188 case "response.redirect": response.sendRedirect(JS.toString(val));
189 case "response.contentType": response.setContentType(JS.toString(val));
191 } catch (IOException e) {