Adding rest handler demo

src/demos.erl

@@ -58,6 +58,7 @@ middle() ->
         #link { text="Wizard", url="/demos/wizard" },#br{},
         #link { text="RESTful Forms", url="/demos/restful" }, #br{},
         #link { text="HTML and Custom Encoding", url="/demos/htmlencode"},#br{},
+        #link { text="Rest API handler", url="/demos/rest"}, #br{},
 %        #link { text="Recaptcha", url="/demos/recaptcha"},#br{},
 
         #h2 { text="Drag, Drop & Sort" },

src/demos/demos_rest.erl

@@ -0,0 +1,50 @@
+-module (demos_rest).
+-include_lib ("nitrogen_core/include/wf.hrl").
+-compile(export_all).
+
+main() -> #template { file="./templates/demos46.html" }.
+
+title() -> "Rest handler example".
+
+headline() -> "HTTP REST Handler".
+
+left() -> 
+    [
+        "
+        <p>
+        Nitrogen allows the creation of HTTP REST API endpoints.
+
+        <p> 
+        It is possible to use various HTTP methods to request and recieves responses through Nitrogen. Methods are provided for decoding & encoding json. Though you can use which ever JSON client you prefair.
+
+        <p>
+        You can use curl or any your favorite HHTP client such as postman..
+        "
+       , 
+       linecount:render()
+    ].
+
+right() -> 
+    [
+        "
+        <p>
+        You can test this using the path /demos/rest/api via these methods:
+
+        <p>
+        <h3> GET </h3><br>
+
+        curl -X GET \"http://nitrogenproject.com/demos/rest/api/name=m3rl1n&city=london\"
+
+        <p>
+        <h3> POST </h3><br>
+
+        curl -X POST \"http://nitrogenproject.com/demos/rest/api\" -d '{\"name\": \"th31nitiate\", \"city\": \"London\"}'
+
+        <p>
+        You can send similar posts request using your favorite HTTP clients such as Postman. 
+        "
+    ].
+
+event(_) -> ok.
+
+

src/demos/demos_rest_api.erl

@@ -0,0 +1,24 @@
+%% -*- mode: nitrogen -*-
+-module (demos_rest_api).
+-compile(export_all).
+-include_lib("nitrogen_core/include/wf.hrl").
+-behavior(nitrogen_rest).
+
+get("") -> 
+    Resp = io_lib:format("A GET request has been submitted with the parameters: ~p~n", [wf:params()]),
+    {200, Resp}.
+
+post("") ->
+    %% The best way to post data is via the request body funcation
+    Params = wf:request_body(),
+    JsonPayload = wf:json_decode(Params),
+    Body = io_lib:format("A POST request has been submitted with the parameters: ~p~n", [JsonPayload]),
+    {200, Body}.
+
+put("") ->
+    Body = io_lib:format("A PUT request has been submitted with the parameters: ~p~n", ["N/A"]),
+    {200, Body}.
+
+delete("") ->
+    Body = io_lib:format("A DELETE request has been submitted with the parameters: ~p~n", ["N/A"]),
+    {200, Body}.