Extract invite code into utility functions for greater re-use and access

server/src/commands/core/invite.js

@@ -4,6 +4,79 @@
 
 import * as UAC from '../utility/UAC/_info';
 
+// module support functions
+/**
+  * Returns a message for if it's a valid nickname to invite. Returns null if there was no error.
+  * @param {any} nick
+  * @return {(string|null)}
+  */
+export function checkNickname (nick, inviterNick) {
+  if (typeof nick !== 'string' || !UAC.verifyNickname(nick)) {
+    return "Nickname was invalid.";
+  } else if (nick === inviterNick) {
+    return "Why would you invite yourself?";
+  }
+
+  return null;
+}
+
+/**
+  * Returns the channel that should be invited to.
+  * @param {any} channel
+  * @return {string}
+  */
+export function getChannel (channel=undefined) {
+  if (typeof channel === 'string') {
+    return channel;
+  } else {
+    return Math.random().toString(36).substr(2, 8);
+  }
+}
+
+/**
+  * Creates the payload that a user who is being invited would receive.
+  * @param {string} inviter The user who is inviting them.
+  * @param {string} channel The channel they are being invited to.
+  * @return {Object}
+  */
+export function createRecipientPayload (inviter, channel) {
+  return {
+    cmd: 'info',
+    type: 'invite',
+    from: inviter,
+    text: `${inviter} invited you to ?${channel}`,
+  };
+}
+
+/**
+  * Creates the payload that a user who invited users (and succeeded) would receive.
+  * @param {string} nick The user who was invited.
+  * @param {string} channel The channel they were invited to.
+  */
+export function createSuccessPayload (nick, channel) {
+  return {
+    cmd: 'info',
+    type: 'invite',
+    invite: channel,
+    text: `You invited ${nick} to ?${channel}`,
+  };
+}
+
+/**
+  * Sends the invites to the recipients.
+  * @param {MainServer} server The server. Required to broadcast the messages.
+  * @param {string} recipientNick The user who is being invited.
+  * @param {string} inviterNick The user who is doing the inviting.
+  * @param {string} originalChannel The channel they have in common, and where the invite is sent in.
+  * @param {string} inviteChannel The channel they are being invited to.
+  */
+export function sendInvite (server, recipientNick, inviterNick, originalChannel, inviteChannel) {
+  return server.broadcast(createRecipientPayload(inviterNick, inviteChannel), {
+    channel: originalChannel,
+    nick: recipientNick,
+  });
+}
+
 // module main
 export async function run(core, server, socket, data) {
   // check for spam
@@ -15,30 +88,19 @@ export async function run(core, server, socket, data) {
   }
 
   // verify user input
-  if (typeof data.nick !== 'string' || !UAC.verifyNickname(data.nick)) {
+  const nickValid = checkNickname(data.nick, socket.nick);
+  if (nickValid !== null) {
+    server.reply({
+      cmd: 'warn',
+      text: nickValid,
+    }, socket);
     return true;
   }
 
-  // why would you invite yourself?
-  if (data.nick === socket.nick) {
-    return true;
-  }
-
-  let channel;
-  if (typeof data.to === 'string') {
-    channel = data.to;
-  } else {
-    channel = Math.random().toString(36).substr(2, 8);
-  }
+  const channel = getChannel(data.to);
 
   // build and send invite
-  const payload = {
-    cmd: 'info',
-    type: 'invite',
-    from: socket.nick,
-    invite: channel,
-    text: `${socket.nick} invited you to ?${channel}`,
-  };
+  const payload = createRecipientPayload(socket.nick, channel);
 
   const inviteSent = server.broadcast(payload, {
     channel: socket.channel,
@@ -54,12 +116,7 @@ export async function run(core, server, socket, data) {
   }
 
   // reply with common channel
-  server.reply({
-    cmd: 'info',
-    type: 'invite',
-    invite: channel,
-    text: `You invited ${data.nick} to ?${channel}`,
-  }, socket);
+  server.reply(createSuccessPayload(data.nick, channel), socket);
 
   // stats are fun
   core.stats.increment('invites-sent');