feat : Check if the given number is a whatsapp number (#54)

* feat : Check if the given number is a whatsapp number

- Avoids sending message to non whatsapp number
- Gets the id of the user from whatsapp server rather than generating on client

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "whatsapp-web.js",
-  "version": "0.3.2-post",
+  "version": "1.0.2-post",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

src/Client.js

@@ -277,12 +277,16 @@ class Client extends EventEmitter {
             let msg;
             if (!chat) { // The chat is not available in the previously chatted list
 
-                //todo : Check if the number is a whatsapp enabled. Whatsapp web sends query exists via ws.
+                let newChatId = await window.WWebJS.getNumberId(chatId);
-                chat = window.Store.Chat.models[0]; //get the topmost chat object and assign the new chatId to it
+                if (newChatId) {
-                let originalChatObjId = chat.id;
+                    //get the topmost chat object and assign the new chatId to it . 
-                chat.id = typeof originalChatObjId === 'string' ? chatId : new window.Store.UserConstructor(chatId, { intentionallyUsePrivateConstructor: true });
+                    //This is just a workaround.May cause problem if there are no chats at all. Need to dig in and emulate how whatsapp web does
-                msg = await window.WWebJS.sendMessage(chat, message, options);
+                    let chat = window.Store.Chat.models[0]; 
-                chat.id = originalChatObjId; //replace the chat with its original id
+                    let originalChatObjId = chat.id;
+                    chat.id = newChatId;
+                    msg = await window.WWebJS.sendMessage(chat, message, options);
+                    chat.id = originalChatObjId; //replace the chat with its original id
+                }
             }
             else
                 msg = await window.WWebJS.sendMessage(chat, message, options);

src/util/Injected.js

@@ -25,7 +25,13 @@ exports.ExposeStore = (moduleRaidStr) => {
 
 exports.LoadUtils = () => {
     window.WWebJS = {};
+    window.WWebJS.getNumberId = async (id) => {
 
+        let result = await window.Store.Wap.queryExist(id);
+        if (result.jid === undefined)
+            throw 'The number provided is not a registered whatsapp user';
+        return result.jid;
+    };
     window.WWebJS.sendMessage = async (chat, content, options = {}) => {
         let attOptions = {};
         if (options.attachment) {