added rpc method

lib/Client.coffee

@@ -92,6 +92,25 @@ parseSearch = (iq) ->
   items = iq.getChildren("item")
   (new JID(i.text()).toString() for i in items)
 
+addRPCElements = (iq, method, params=[]) ->
+  throw new TypeError unless typeof method is "string"
+  iq.c("methodCall").c("methodName").t(method).up()
+  if not (params instanceof Array)
+    console?.warn? "No parameters added: parameter is not an array"
+    return
+  if params.length > 0
+    iq.c("params")
+    for p in params
+      iq.c("param")
+        .cnode(joap.Serializer.serialize p).up().up()
+
+parseRPCParams = (iq) ->
+  joap.Parser.parse iq
+    .getChild("methodResponse")
+    .getChild("params")
+    .getChild("param")
+    .getChild("value")
+
 class JOAPClient
 
   constructor: (@xmpp) ->
@@ -128,4 +147,9 @@ class JOAPClient
       beforeSend: (iq) -> addXMLAttributes iq, attrs
       onResult: parseSearch
 
+  methodCall: (method, address, params, cb) ->
+    sendRequest.call @, "query", address, cb,
+      beforeSend: (iq) -> addRPCElements iq, method, params
+      onResult: parseRPCParams
+
 module.exports = JOAPClient

spec/Client.spec.coffee

@@ -158,3 +158,27 @@ describe "Client", ->
         done = true
 
       waitsFor -> done
+
+  describe "rpc method", ->
+    it "sends a correct iq", ->
+
+      done = false
+      iq = null
+      xmppComp.send = (req) ->
+        iq = req.tree()
+        (expect iq.getChild("query")
+          .getChild("methodCall")
+          .getChild("methodName").text()).toEqual "myMethod"
+        res = new ltx.Element "iq", type: 'result', id: iq.tree().attrs.id
+        res.c("query", xmlns: RPC_NS)
+          .c("methodResponse")
+            .c("params")
+              .c("param")
+                .c("value").c("int").t(7)
+        xmppComp.channels.stanza res.tree()
+
+      @c.methodCall "myMethod", "class@c.domain.tld", ["avalue"] , (err, s, res) ->
+        (expect res).toEqual 7
+        done = true
+
+      waitsFor -> done