From 0db24252fd119cafee34f1bfa023763fcdd7ebf5 Mon Sep 17 00:00:00 2001
From: Sadie Powell <sadie@witchery.services>
Date: Thu, 25 Feb 2021 20:06:46 +0000
Subject: Implement support for multi-prefix on WHOIS.

---
 include/modules/whois.h     | 16 +++++++++++++++
 src/coremods/core_whois.cpp | 16 ---------------
 src/modules/m_namesx.cpp    | 47 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 63 insertions(+), 16 deletions(-)

diff --git a/include/modules/whois.h b/include/modules/whois.h
index f158f82cc..c081a2b6a 100644
--- a/include/modules/whois.h
+++ b/include/modules/whois.h
@@ -28,6 +28,22 @@ namespace Whois
 	class Context;
 }
 
+enum
+{
+	// From RFC 1459.
+	RPL_WHOISUSER = 311,
+	RPL_WHOISOPERATOR = 313,
+	RPL_WHOISIDLE = 317,
+	RPL_WHOISCHANNELS = 319,
+
+	// From UnrealIRCd.
+	RPL_WHOISHOST = 378,
+	RPL_WHOISMODES = 379,
+
+	// InspIRCd-specific.
+	RPL_CHANNELSMSG = 651
+};
+
 class Whois::EventListener : public Events::ModuleEventListener
 {
  public:
diff --git a/src/coremods/core_whois.cpp b/src/coremods/core_whois.cpp
index bd0502998..c1c4777ef 100644
--- a/src/coremods/core_whois.cpp
+++ b/src/coremods/core_whois.cpp
@@ -30,22 +30,6 @@
 #include "inspircd.h"
 #include "modules/whois.h"
 
-enum
-{
-	// From RFC 1459.
-	RPL_WHOISUSER = 311,
-	RPL_WHOISOPERATOR = 313,
-	RPL_WHOISIDLE = 317,
-	RPL_WHOISCHANNELS = 319,
-
-	// From UnrealIRCd.
-	RPL_WHOISHOST = 378,
-	RPL_WHOISMODES = 379,
-
-	// InspIRCd-specific.
-	RPL_CHANNELSMSG = 651
-};
-
 enum SplitWhoisState
 {
 	// Don't split private/secret channels into a separate RPL_WHOISCHANNELS numeric.
diff --git a/src/modules/m_namesx.cpp b/src/modules/m_namesx.cpp
index 4f93da21a..ed983b32d 100644
--- a/src/modules/m_namesx.cpp
+++ b/src/modules/m_namesx.cpp
@@ -27,11 +27,13 @@
 #include "modules/cap.h"
 #include "modules/names.h"
 #include "modules/who.h"
+#include "modules/whois.h"
 
 class ModuleNamesX
 	: public Module
 	, public Names::EventListener
 	, public Who::EventListener
+	, public Whois::LineEventListener
 {
  private:
 	Cap::Capability cap;
@@ -40,6 +42,7 @@ class ModuleNamesX
 	ModuleNamesX()
 		: Names::EventListener(this)
 		, Who::EventListener(this)
+		, Whois::LineEventListener(this)
 		, cap(this, "multi-prefix")
 	{
 	}
@@ -104,6 +107,50 @@ class ModuleNamesX
 		numeric.GetParams()[flag_index].append(prefixes, 1, std::string::npos);
 		return MOD_RES_PASSTHRU;
 	}
+
+	ModResult OnWhoisLine(Whois::Context& whois, Numeric::Numeric& numeric) CXX11_OVERRIDE
+	{
+		if (numeric.GetNumeric() != RPL_WHOISCHANNELS || !cap.get(whois.GetSource()))
+			return MOD_RES_PASSTHRU;
+
+		// :testnet.inspircd.org 319 test Sadie :#test ~#inspircd
+		if (numeric.GetParams().size() < 2 || numeric.GetParams().back().empty())
+			return MOD_RES_PASSTHRU;
+
+		std::stringstream newchannels;
+		irc::spacesepstream channelstream(numeric.GetParams().back());
+		for (std::string channel; channelstream.GetToken(channel); )
+		{
+			size_t hashpos = channel.find('#');
+			if (!hashpos || hashpos == std::string::npos)
+			{
+				// The entry is malformed or the user has no privs.
+				newchannels << channel << ' ';
+				continue;
+			}
+
+			Channel* chan = ServerInstance->FindChan(channel.substr(hashpos));
+			if (!chan)
+			{
+				// Should never happen.
+				newchannels << channel << ' ';
+				continue;
+			}
+
+			Membership* memb = chan->GetUser(whois.GetTarget());
+			if (!memb)
+			{
+				// Should never happen.
+				newchannels << channel << ' ';
+				continue;
+			}
+
+			newchannels << memb->GetAllPrefixChars() << chan->name << ' ';
+		}
+
+		numeric.GetParams().back() = newchannels.str();
+		return MOD_RES_PASSTHRU;
+	}
 };
 
 MODULE_INIT(ModuleNamesX)
-- 
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