Added the joinServer funciton internally

src/Client/InternalClient.js

@@ -138,6 +138,38 @@ class InternalClient {
 				});
 		});
 	}
+	
+	//def joinServer
+	joinServer(invite) {
+		var self = this;
+		return new Promise((resolve, reject) => {
+			
+			invite = self.resolver.resolveInvite(invite);
+			if(invite){
+				
+				request
+					.post(Endpoints.INVITE(invite.id))
+					.set("authorization", self.token)
+					.end((err, res) => {
+						if(err){
+							reject(err);
+						}else{
+							// valid server, wait until it is received via ws and cached
+							var inter = setInterval(() => {
+								if (self.servers.get("id", res.body.guild.id)) {
+									clearInterval(inter);
+									resolve(self.servers.get("id", res.body.guild.id));
+								}
+							}, 20);
+						}
+					});
+				
+			}else{
+				reject(new Error("Not a valid invite"));
+			}
+			
+		});
+	}
 
 	//def leaveServer
 	leaveServer(srv) {

src/Client/Resolver/Resolver.js

@@ -9,12 +9,29 @@ var User = require("../../Structures/User.js"),
 	ServerChannel = require("../../Structures/ServerChannel.js"),
 	PMChannel = require("../../Structures/PMChannel.js"),
 	Server = require("../../Structures/Server.js"),
-	Message = require("../../Structures/Message.js");
+	Message = require("../../Structures/Message.js"),
+	Invite = require("../../Structures/Invite.js");
 
 class Resolver {
 	constructor(internal) {
 		this.internal = internal;
 	}
+	
+	resolveInvite(resource){
+		if(resource instanceof Invite){
+			return resource;
+		}else if (typeof resource == "string" || resource instanceof String) {
+
+			if (resource.indexOf("http") === 0) {
+				var split = resource.split("/");
+				return split.pop();
+			} else {
+				return resource;
+			}
+
+		}
+		return null;
+	}
 
 	resolveServer(resource){
 		if(resource instanceof Server){

src/Constants.js

@@ -7,6 +7,7 @@ var Endpoints = {
 	GATEWAY: `${API}/gateway`,
 	USER_CHANNELS: (userID) => `${API}/users/${userID}/channels`,
 	AVATAR : (userID, avatar) => `${API}/users/${userID}/avatars/${avatar}.jpg`,
+	INVITE: (id) => `${API}/invite/${id}`,
 
 	// servers
 	SERVERS: `${API}/guilds`,