5 import javax.servlet.*;
6 import javax.servlet.http.*;
8 import org.ibex.util.*;
9 import org.ibex.util.Collections;
12 import org.prevayler.*;
14 public class Servlet extends HttpServlet {
16 private Prevayler prevayler;
18 private ServletContext cx = null;
20 public void destroy() { try {
21 synchronized(this.getClass()) {
22 Prevayler privatePrevayler = prevayler;
23 if (prevayler == null) return;
25 Prevalence.destroy(cx, prevayler);
27 } catch (Exception e) { e.printStackTrace(); } }
29 public void init(ServletConfig sc) throws ServletException {
30 cx = sc.getServletContext();
31 prevayler = Prevalence.getPrevayler(cx);
32 prevalent = (JS)prevayler.prevalentSystem();
35 public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException { doGet(request, response); }
36 public void doGet(HttpServletRequest rq, HttpServletResponse rs) throws IOException {
37 String src = rq.getServletPath();
38 Servlet.Scope scope = new Servlet.Scope(cx, rq, rs, prevayler);
42 StringWriter w = new StringWriter();
43 Template t = Template.parse(cx.getRealPath(src), scope);
44 Template.wrap(t, scope).out(w);
45 rs.getWriter().write(w.toString());
47 } catch (Template.RedirectSignal r) {
51 } catch (Template.Signal s) {
52 } catch (JSElement.Exn e) {
53 PrintWriter w = new PrintWriter(rs.getWriter());
54 w.print("\n"+src+": ");
55 w.println(e.getMessage());
56 System.out.println(e);
57 } catch (Exception e) {
58 System.out.println("Unexpected Exception:");
63 public static class Scope extends Template.Scope {
64 private final ServletContext cx;
65 private final HttpServletRequest request;
66 private final HttpServletResponse response;
67 private final Prevayler prevayler;
69 public Scope(ServletContext cx, HttpServletRequest rq, HttpServletResponse rs, Prevayler p) {
70 super(null); this.cx = cx; request = rq; response = rs; prevayler = p;
73 public String getLocalPath() { return cx.getRealPath("/") + "/WEB-INF/"; }
74 public void transaction(JS t) {
75 try { prevayler.execute(new Prevalence.JSTransaction(t)); }
76 catch (Exception e) { e.printStackTrace(); throw new RuntimeException(e); }
79 private JS session = new JS() {
80 public Object get(Object key) throws JSExn {
81 //#switch(JS.toString(key))
82 case "created": return new JSDate(request.getSession(true).getCreationTime());
83 case "accessed": return new JSDate(request.getSession(true).getLastAccessedTime());
84 case "invalidate": return METHOD;
86 return super.get(key);
88 public void put(Object key, Object val) throws JSExn {
89 //#switch(JS.toString(key))
90 case "created": throw new JSExn("can not set session.created");
91 case "accessed": throw new JSExn("can not set session.accessed");
92 case "invalidate": throw new JSExn("can not set session.invalidate");
96 public Object callMethod(Object method, final Object a, final Object b, Object c, Object[] rest, int nargs)
98 //#switch(JS.toString(method))
99 case "invalidate": request.getSession(true).invalidate(); return null;
101 return super.callMethod(method, a, b, c, rest, nargs);
104 private JS params = new JS() {
105 private List keys = null;
106 public Object get(Object key) { return request.getParameter(JS.toString(key)); }
107 public Collection keys() {
108 return keys == null ? keys = Collections.list(request.getParameterNames()) : keys; }
110 private JS cookies = new JS() {
112 public Object get(Object key) { return request.getCookie(JS.toString(key)); }
113 public Enumeration keys() { return request.getCookieNames(); }
116 private JS sessionAttributes = new JS() {
117 private List keys = null;
118 public Object get(Object key) {
119 return request.getSession(true).getAttribute(JS.toString(key)); }
120 public void put(Object key, Object val) {
121 if (val == null) request.getSession(true).removeAttribute(JS.toString(key));
122 else request.setAttribute(JS.toString(key), val); }
123 public Collection keys() {
124 return keys == null ? keys = Collections.list(request.getSession(true).getAttributeNames()) : keys; }
126 private JS requestHeader = new JS() {
127 private List keys = null;
128 public Object get(Object key) { return request.getHeader(JS.toString(key)); }
129 public Collection keys() {
130 return keys == null ? keys = Collections.list(request.getHeaderNames()) : keys; }
132 private JS responseHeader = new JS() {
133 public void put(Object key, Object val) {
134 response.setHeader(JS.toString(key), JS.toString(val)); }
138 /** lets us put multi-level get/put/call keys all in the same method */
139 private class Sub extends JS {
141 Sub(Object key) { this.key = key; }
142 public void put(Object key, Object val) throws JSExn {
143 Scope.this.put(JS.toString(this.key) + "." + JS.toString(key), val); }
144 public Object get(Object key) throws JSExn {
145 return Scope.this.get(JS.toString(this.key) + "." + JS.toString(key)); }
146 public Object call(Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
147 return Scope.this.callMethod(this.key, a0, a1, a2, rest, nargs);
149 public Object callMethod(Object method, Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
150 return Scope.this.callMethod(JS.toString(this.key) + "."
151 + JS.toString(method), a0, a1, a2, rest, nargs);
154 private Sub getSub(String key) { return new Sub(key); }
156 public Object callMethod(Object method, final Object a, final Object b, Object c, Object[] rest, int nargs) throws JSExn {
158 case "session.invalidate": request.getSession(true).invalidate(); return null;
160 String path = JS.toString(a);
161 if (path.indexOf("..") != -1) throw new JSExn("cannot use .. in paths");
162 File f = new File(cx.getRealPath("/") + File.separatorChar + path);
163 if (!f.isDirectory()) return null;
164 String[] contents = f.list();
165 JSArray ret = new JSArray(contents.length);
166 for(int i=0; i<contents.length; i++) ret.add(contents[i]);
171 public Object get(Object key) throws JSExn {
174 case "arg": return null;
175 case "prevalent": return prevayler.prevalentSystem();
176 case "request": return getSub("request");
177 case "request.user": return request.getRemoteUser();
178 case "request.header": return requestHeader;
179 case "request.method": return request.getMethod();
180 case "request.remote": return getSub("request.remote");
181 case "request.remote.ip": return request.getRemoteAddr();
182 case "request.remote.host": return request.getRemoteHost();
183 case "request.ssl": return new Boolean(request.isSecure());
184 case "request.path": return request.getPathInfo();
185 case "response": return getSub("response");
186 case "response.header": return responseHeader;
187 case "session": return session;
188 case "page": return getSub("page");
189 //case "page.lastmodified": return new JSDate(new File(path).lastModified()); FIXME
190 case "context": return getSub("context");
191 case "context.list": return METHOD;
192 case "params": return params;
193 case "cookie": return cookies;
194 case "xt.date": return new JSDate(); // TODO: discuss
198 public void put(Object key, Object val) throws JSExn {
200 //#switch(JS.toString(key))
201 case "transaction": transaction((JS)val);
202 case "response.code": response.setStatus(JS.toInt(val));
203 case "response.redirect": response.sendRedirect(JS.toString(val));
204 case "response.contentType": response.setContentType(JS.toString(val));
206 } catch (IOException e) {