init for chats and api

stubs/api/db.js

@@ -1,5 +1,6 @@
 // Read already defined users (pseudo-DB)
 const users = require('./auth/users.json');
+const chats = require('./chat/chats.json');
 
 const getUserFromDB = (userID) => {
     if (!userID) {return false;}
@@ -14,4 +15,18 @@ const getUserFromDB = (userID) => {
     }
 }
 
-module.exports = {users, getUserFromDB}
+const getChatFromDB = (firstID, secondID) => {
+    if (!firstID || !secondID) {return false;}
+
+    // Accessing 'DB'
+    const chat = chats.find((item) =>
+        (item.id1 === firstID && item.id2 === secondID) || (item.id1 === secondID && item.id2 === firstID));
+
+    if (chat) {
+        return chat;
+    } else {
+        return false;
+    }
+}
+
+module.exports = {users, chats, getUserFromDB, getChatFromDB}