Add the responsability of parse the data attribute

Signed-off-by: Fabio José <fabiojose@gmail.com>

lib/bindings/http/receiver_binary_0_2.js

@@ -3,6 +3,11 @@ const Commons    = require("./commons.js");
 const Cloudevent = require("../../cloudevent.js");
 const Spec02     = require("../../specs/spec_0_2.js");
 
+const JSONParser = require("../../formats/json/parser.js");
+
+const parser_by_type = {};
+parser_by_type[Constants.MIME_JSON] = new JSONParser();
+
 const allowed_content_types = [];
 allowed_content_types.push(Constants.MIME_JSON);
 
@@ -47,8 +52,11 @@ function validate_args(payload, attributes) {
     throw {message: "attributes is null or undefined"};
   }
 
-  if((typeof payload) !== "object"){
-    throw {message: "payload must be an object", erros: [typeof payload]};
+  if((typeof payload) !== "object" && (typeof payload) !== "string"){
+    throw {
+      message: "payload must be an object or a string",
+      errors: [typeof payload]
+    };
   }
 }
 
@@ -66,8 +74,10 @@ Receiver.prototype.check = function(payload, headers) {
   // Validation Level 1
   if(!allowed_content_types
       .includes(sanity_headers[Constants.HEADER_CONTENT_TYPE])){
-        throw {message: "invalid content type",
-              errors: [sanity_headers[Constants.HEADER_CONTENT_TYPE]]};
+        throw {
+          message: "invalid content type",
+          errors: [sanity_headers[Constants.HEADER_CONTENT_TYPE]]
+        };
   }
 
   for(i in required_headers){
@@ -77,9 +87,10 @@ Receiver.prototype.check = function(payload, headers) {
   }
 
   if(sanity_headers[Constants.BINARY_HEADERS_02.SPEC_VERSION] !== "0.2"){
-    throw {message: "invalid spec version",
-            errors:
-              [sanity_headers[Constants.BINARY_HEADERS_02.SPEC_VERSION]]};
+    throw {
+      message: "invalid spec version",
+      errors: [sanity_headers[Constants.BINARY_HEADERS_02.SPEC_VERSION]]
+    };
   }
 
   // No erros! Its contains the minimum required attributes
@@ -103,8 +114,13 @@ Receiver.prototype.parse = function(payload, headers) {
     }
   }
 
+  // Parses the payload
+  var parsedPayload =
+    parser_by_type[sanity_headers[Constants.HEADER_CONTENT_TYPE]]
+      .parse(payload);
+
   // Sets the data
-  cloudevent.data(payload);
+  cloudevent.data(parsedPayload);
 
   // Checks the event spec
   cloudevent.format();