5 import javax.servlet.*;
6 import javax.servlet.http.*;
8 import org.ibex.util.Collections;
11 import org.prevayler.*;
13 public class Servlet extends HttpServlet {
15 private Prevayler prevayler;
17 private ServletContext cx = null;
19 public void destroy() { try {
20 synchronized(this.getClass()) {
21 Prevayler privatePrevayler = prevayler;
22 if (prevayler == null) return;
24 Prevalence.destroy(cx, prevayler);
26 } catch (Exception e) { e.printStackTrace(); } }
28 public void init(ServletConfig sc) throws ServletException {
29 cx = sc.getServletContext();
30 prevayler = Prevalence.getPrevayler(cx);
31 prevalent = (JS)prevayler.prevalentSystem();
34 public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException { doGet(request, response); }
35 public void doGet(HttpServletRequest rq, HttpServletResponse rs) throws IOException {
36 String src = rq.getServletPath();
37 Servlet.Scope scope = new Servlet.Scope(cx, rq, rs, prevayler);
38 PrintWriter w = new PrintWriter(rs.getWriter());
42 StringWriter buffer = new StringWriter();
43 Template t = Template.parse(cx.getRealPath(src), scope);
44 Template.wrap(t, scope).out(buffer);
45 w.write(buffer.toString());
47 } catch (Template.RedirectSignal r) {
51 } catch (Template.Signal s) {
53 } catch (JSElement.Exn e) {
54 w.print("\n"+src+": ");
55 w.println(e.getMessage());
56 System.out.println(e);
57 } catch (FileNotFoundException e) {
58 w.print("\nfile not found: ");
59 w.println(e.getMessage());
60 System.out.println(e);
61 } catch (IOException e) {
62 w.print("\nio error: ");
63 w.println(e.getMessage());
65 } catch (Exception e) {
66 System.out.println("Unexpected Exception:");
71 public static class Scope extends Template.Scope {
72 private final ServletContext cx;
73 private final HttpServletRequest request;
74 private final HttpServletResponse response;
75 private final Prevayler prevayler;
77 public Scope(ServletContext cx, HttpServletRequest rq, HttpServletResponse rs, Prevayler p) {
78 super(null); this.cx = cx; request = rq; response = rs; prevayler = p;
81 public String getLocalPath() { return cx.getRealPath("/") + "/WEB-INF/"; }
82 public void transaction(JS t) {
83 try { prevayler.execute(new Prevalence.JSTransaction(t)); }
84 catch (Exception e) { e.printStackTrace(); throw new RuntimeException(e); }
87 private JS session = new JS() {
88 public Object get(Object key) throws JSExn {
89 //#switch(JS.toString(key))
90 case "created": return new JSDate(request.getSession(true).getCreationTime());
91 case "accessed": return new JSDate(request.getSession(true).getLastAccessedTime());
92 case "invalidate": return METHOD;
94 return super.get(key);
96 public void put(Object key, Object val) throws JSExn {
97 //#switch(JS.toString(key))
98 case "created": throw new JSExn("can not set session.created");
99 case "accessed": throw new JSExn("can not set session.accessed");
100 case "invalidate": throw new JSExn("can not set session.invalidate");
104 public Object callMethod(Object method, final Object a, final Object b, Object c, Object[] rest, int nargs)
106 //#switch(JS.toString(method))
107 case "invalidate": request.getSession(true).invalidate(); return null;
109 return super.callMethod(method, a, b, c, rest, nargs);
112 private JS params = new JS() {
113 private List keys = null;
114 public Object get(Object key) { return request.getParameter(JS.toString(key)); }
115 public Collection keys() {
116 return keys == null ? keys = Collections.list(request.getParameterNames()) : keys; }
118 private JS cookies = new JS() {
120 public Object get(Object key) { return request.getCookie(JS.toString(key)); }
121 public Enumeration keys() { return request.getCookieNames(); }
124 private JS sessionAttributes = new JS() {
125 private List keys = null;
126 public Object get(Object key) {
127 return request.getSession(true).getAttribute(JS.toString(key)); }
128 public void put(Object key, Object val) {
129 if (val == null) request.getSession(true).removeAttribute(JS.toString(key));
130 else request.setAttribute(JS.toString(key), val); }
131 public Collection keys() {
132 return keys == null ? keys = Collections.list(request.getSession(true).getAttributeNames()) : keys; }
134 private JS requestHeader = new JS() {
135 private List keys = null;
136 public Object get(Object key) { return request.getHeader(JS.toString(key)); }
137 public Collection keys() {
138 return keys == null ? keys = Collections.list(request.getHeaderNames()) : keys; }
140 private JS responseHeader = new JS() {
141 public void put(Object key, Object val) {
142 response.setHeader(JS.toString(key), JS.toString(val)); }
146 /** lets us put multi-level get/put/call keys all in the same method */
147 private class Sub extends JS {
149 Sub(Object key) { this.key = key; }
150 public void put(Object key, Object val) throws JSExn {
151 Scope.this.put(JS.toString(this.key) + "." + JS.toString(key), val); }
152 public Object get(Object key) throws JSExn {
153 return Scope.this.get(JS.toString(this.key) + "." + JS.toString(key)); }
154 public Object call(Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
155 return Scope.this.callMethod(this.key, a0, a1, a2, rest, nargs);
157 public Object callMethod(Object method, Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
158 return Scope.this.callMethod(JS.toString(this.key) + "."
159 + JS.toString(method), a0, a1, a2, rest, nargs);
162 private Sub getSub(String key) { return new Sub(key); }
164 public Object callMethod(Object method, final Object a, final Object b, Object c, Object[] rest, int nargs) throws JSExn {
166 case "session.invalidate": request.getSession(true).invalidate(); return null;
168 String path = JS.toString(a);
169 if (path.indexOf("..") != -1) throw new JSExn("cannot use .. in paths");
170 File f = new File(cx.getRealPath("/") + File.separatorChar + path);
171 if (!f.isDirectory()) return null;
172 String[] contents = f.list();
173 JSArray ret = new JSArray(contents.length);
174 for(int i=0; i<contents.length; i++) ret.add(contents[i]);
179 public Object get(Object key) throws JSExn {
182 case "arg": return null;
183 case "prevalent": return prevayler.prevalentSystem();
184 case "request": return getSub("request");
185 case "request.user": return request.getRemoteUser();
186 case "request.header": return requestHeader;
187 case "request.method": return request.getMethod();
188 case "request.remote": return getSub("request.remote");
189 case "request.remote.ip": return request.getRemoteAddr();
190 case "request.remote.host": return request.getRemoteHost();
191 case "request.ssl": return new Boolean(request.isSecure());
192 case "request.path": return request.getPathInfo();
193 case "response": return getSub("response");
194 case "response.header": return responseHeader;
195 case "session": return session;
196 case "page": return getSub("page");
197 //case "page.lastmodified": return new JSDate(new File(path).lastModified()); FIXME
198 case "context": return getSub("context");
199 case "context.list": return METHOD;
200 case "params": return params;
201 case "cookie": return cookies;
202 case "xt.date": return new JSDate(); // TODO: discuss
206 public void put(Object key, Object val) throws JSExn {
208 //#switch(JS.toString(key))
209 case "transaction": transaction((JS)val);
210 case "response.code": response.setStatus(JS.toInt(val));
211 case "response.redirect": response.sendRedirect(JS.toString(val));
212 case "response.contentType": response.setContentType(JS.toString(val));
214 } catch (IOException e) {