From f3c9c2b4b552b078a8a0faca7eb1707598028994 Mon Sep 17 00:00:00 2001
From: vegax87 <vegax987@gmail.com>
Date: Mon, 23 Jan 2017 17:44:35 +0100
Subject: [PATCH] USERHOST command

---
 CHANGELOG.md    |  1 +
 irc/commands.go |  4 ++++
 irc/help.go     |  6 ++++++
 irc/server.go   | 18 ++++++++++++++++++
 4 files changed, 29 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 360cba4f..96c5cf34 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ New release of Oragono!
 ### Security
  
 ### Added
+* Added `USERHOST` command (thanks @vegax87).
  
 ### Changed
  
diff --git a/irc/commands.go b/irc/commands.go
index 6f553443..ed811508 100644
--- a/irc/commands.go
+++ b/irc/commands.go
@@ -238,6 +238,10 @@ var Commands = map[string]Command{
 		usablePreReg: true,
 		minParams:    4,
 	},
+	"USERHOST": {
+		handler:   userhostHandler,
+		minParams: 1,
+	},
 	"VERSION": {
 		handler:   versionHandler,
 		minParams: 0,
diff --git a/irc/help.go b/irc/help.go
index ec9290a3..bb89459f 100644
--- a/irc/help.go
+++ b/irc/help.go
@@ -370,6 +370,12 @@ For example:
 Used in connection registration, sets your username and realname to the given
 values (though your username may also be looked up with Ident).`,
 	},
+
+	"userhost": {
+		text: `Show the nick, user and host of a user. Normally only used by the client or in scripts.
+Note: if you are not an IRCOp then it will show a cloaked hostname if the user is +x (and it's not yourself). `,
+	},
+
 	"version": {
 		text: `VERSION [server]
 
diff --git a/irc/server.go b/irc/server.go
index b404b153..26516b90 100644
--- a/irc/server.go
+++ b/irc/server.go
@@ -1848,3 +1848,21 @@ func lusersHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
 	client.Send(nil, server.name, RPL_LUSERME, client.nick, fmt.Sprintf("I have %d clients and %d servers", totalcount, 1))
 	return false
 }
+
+func userhostHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
+	nickname := msg.Params[0]
+
+	casefoldedNickname, err := CasefoldName(nickname)
+	target := server.clients.Get(casefoldedNickname)
+	if err != nil || target == nil {
+		client.Send(nil, client.server.name, ERR_NOSUCHNICK, nickname, "No such nick")
+		return false
+	}
+
+	if target.flags[Away] {
+		client.Send(nil, client.server.name, RPL_USERHOST, client.nick, fmt.Sprintf(strings.TrimSpace("%s =- %s @ %s"), target.nick, target.username, target.hostname))
+	} else {
+		client.Send(nil, client.server.name, RPL_USERHOST, client.nick, fmt.Sprintf(strings.TrimSpace("%s =+ %s @ %s"), target.nick, target.username, target.hostname))
+	}
+	return false
+}