r9131: started adding the server side code for "AJAJ" (asynchronous javascript and...
authorAndrew Tridgell <tridge@samba.org>
Fri, 5 Aug 2005 19:02:01 +0000 (19:02 +0000)
committerGerald (Jerry) Carter <jerry@samba.org>
Wed, 10 Oct 2007 18:31:19 +0000 (13:31 -0500)
This is rather like AJAX, but passes around javascript objects between
the client and server, taking advantage of the fact that we have the
same language on both client and server.

source/scripting/libjs/encoder.js [new file with mode: 0644]
source/scripting/libjs/server_call.js [new file with mode: 0644]

diff --git a/source/scripting/libjs/encoder.js b/source/scripting/libjs/encoder.js
new file mode 100644 (file)
index 0000000..65b2854
--- /dev/null
@@ -0,0 +1,100 @@
+/*
+       server side js functions for encoding/decoding objects into linear strings
+
+       Copyright Andrew Tridgell 2005
+       released under the GNU GPL Version 2 or later
+*/
+/*
+       usage:
+
+         enc = encodeObject(obj);
+         obj = decodeObject(enc);
+
+       The encoded format of the object is a string that is safe to
+       use in URLs
+
+       Note that only data elements are encoded, not functions
+*/
+
+function __count_members(o) {
+       var i, count = 0;
+       for (i in o) { 
+               count++;  
+       }
+       return count;
+}
+
+function __replace(str, old, rep) {
+       var s = string_init();
+       var a = s.split(old, str);
+       var j = s.join(rep, a);
+       return s.join(rep, a);
+}
+
+function encodeObject(o) {
+       var s = string_init();
+       var i, r = s.sprintf("%u:", __count_members(o));
+       for (i in o) {
+               var t = typeof(o[i]);
+               if (t == 'object' && o[i] == null) {
+                       t = 'null';
+               }
+               if (t == 'object') {
+                       r = s.sprintf("%s%s:%s:%s", r, i, t, encodeObject(o[i]));
+               } else if (t == "string") {
+                       var enc = s.encodeURIComponent(o[i]);
+                       var rep = __replace(enc, '%', '#');
+                       r = s.sprintf("%s%s:%s:%s:", 
+                                     r, i, t, __replace(s.encodeURIComponent(o[i]),'%','#'));
+               } else if (t == "boolean" || t == "number") {
+                       r = s.sprintf("%s%s:%s:%s:", r, i, t, "" + o[i]);
+               } else if (t == "undefined" || t == "null") {
+                       r = s.sprintf("%s%s:%s:", r, i, t);
+               } else {
+                       println("Unable to linearise type " + t);
+               }
+       }
+       return r;
+}
+
+function decodeObjectArray(a) {
+       var s = string_init();
+       var o = new Object();
+       var i, count = a[a.i]; a.i++;
+       for (i=0;i<count;i++) {
+               var name  = a[a.i]; a.i++;
+               var type  = a[a.i]; a.i++;
+               var value;
+               if (type == 'object') {
+                       o[name] = decodeObjectArray(a);
+               } else if (type == "string") {
+                       value = s.decodeURIComponent(__replace(a[a.i],'#','%')); a.i++;
+                       o[name] = value;
+               } else if (type == "boolean") {
+                       value = a[a.i]; a.i++;
+                       if (value == 'true') {
+                               o[name] = true;
+                       } else {
+                               o[name] = false;
+                       }
+               } else if (type == "undefined") {
+                       o[name] = undefined;
+               } else if (type == "null") {
+                       o[name] = null;
+               } else if (type == "number") {
+                       value = a[a.i]; a.i++;
+                       o[name] = value + 0;
+               } else {
+                       println("Unable to delinearise type " + t);
+                       assert(t == "supported type");
+               }
+       }
+       return o;
+}
+
+function decodeObject(str) {
+       var s = string_init();
+       var a = s.split(':', str);
+       a.i = 0;
+       return decodeObjectArray(a);
+}
diff --git a/source/scripting/libjs/server_call.js b/source/scripting/libjs/server_call.js
new file mode 100644 (file)
index 0000000..1ed3053
--- /dev/null
@@ -0,0 +1,95 @@
+/*
+       server side js functions for handling async calls from js clients
+
+       Copyright Andrew Tridgell 2005
+       released under the GNU GPL Version 2 or later
+*/
+
+libinclude("encoder.js");
+
+/*
+  a remote printf, for displaying stuff on smbd stdout
+*/
+function __server_printf()
+{
+       print(vsprintf(arguments));
+       return undefined;
+}
+
+/*
+  register a new call
+*/
+function __register_call(name, func)
+{
+       var c = this;
+       c.calls[name] = func;
+}
+
+/*
+  run a call sent from the client, and output the returned object (if any)
+*/
+function __run_call() {
+       var c = this;
+       var name = form['func'];
+       if (name == undefined) {
+               println("no function name given in run_call");
+               return;
+       }
+       var args = form['args'];
+       if (args == undefined) {
+               println("no function arguments given in run_call");
+               return;
+       }
+       args = decodeObject(args);
+       if (c.calls[name] == undefined) {
+               println("undefined remote call " + name);
+               return;
+       }
+       var f = c.calls[name];
+       var res;
+       /* oh what a hack - should write a varargs ejs helper */
+       if (args.length == 0) {
+               res = f();
+       } else if (args.length == 1) {
+               res = f(args[0]);
+       } else if (args.length == 2) {
+               res = f(args[0], args[1]);
+       } else if (args.length == 3) {
+               res = f(args[0], args[1], args[2]);
+       } else if (args.length == 4) {
+               res = f(args[0], args[1], args[2], args[3]);
+       } else if (args.length == 5) {
+               res = f(args[0], args[1], args[2], args[3], args[4]);
+       } else if (args.length == 6) {
+               res = f(args[0], args[1], args[2], args[3], args[4], args[5]);
+       } else if (args.length == 7) {
+               res = f(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
+       } else if (args.length == 8) {
+               res = f(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7]);
+       } else {
+               println("too many arguments for remote call: " + name);
+               return;
+       }
+       var repobj = new Object();
+       repobj.res = res;
+       write(encodeObject(repobj));
+}
+
+
+
+/*
+  initialise a server call object
+*/
+function servCallObj()
+{
+       var c = new Object();
+       c.add = __register_call;
+       c.run = __run_call;
+       c.calls = new Object();
+
+       /* add some basic calls */
+       c.add('printf', __server_printf);
+
+       return c;
+}
+