From 10a83bd2faa914f186d549cebb5f57b0552e493d Mon Sep 17 00:00:00 2001
From: gumi <git@gumi.ca>
Date: Wed, 8 Jul 2020 16:25:02 +0000
Subject: never clear the invisible/hidden gm status

---
 src/char/char.cpp     |  9 +++++++++
 src/map/atcommand.cpp | 25 +++++++++++++++++++++++++
 src/map/atcommand.hpp |  2 ++
 src/map/pc.cpp        | 23 ++++++++++++-----------
 src/map/skill.cpp     |  2 +-
 5 files changed, 49 insertions(+), 12 deletions(-)

diff --git a/src/char/char.cpp b/src/char/char.cpp
index 417b0d3..4d930f1 100644
--- a/src/char/char.cpp
+++ b/src/char/char.cpp
@@ -812,8 +812,17 @@ void create_online_files(void)
                 // display each player.
                 for (CharPair& cd : char_keys)
                 {
+                    CharData *p = nullptr;
+
                     if (!server_for(&cd))
                         continue;
+                    
+                    p = cd.data.get();
+
+                    // failsafe
+                    if (bool(p->option & Opt0::HIDE))
+                        continue;
+
                     players++;
                     FPRINTF(fp2, "      <tr>\n"_fmt);
                     // displaying the character name
diff --git a/src/map/atcommand.cpp b/src/map/atcommand.cpp
index 3058584..459672d 100644
--- a/src/map/atcommand.cpp
+++ b/src/map/atcommand.cpp
@@ -337,6 +337,31 @@ bool is_atcommand(Session *s, dumb_ptr<map_session_data> sd,
     }
 }
 
+bool can_use_atcommand(dumb_ptr<map_session_data> sd, ZString message)
+{
+    nullpo_retr(false, sd);
+
+    if (!message.startswith('@'))
+        return false;
+
+    XString command;
+    ZString arg;
+    asplit(message, &command, &arg);
+
+    GmLevel gmlvl = pc_isGM(sd);
+
+    if (battle_config.atcommand_gm_only != 0 && !gmlvl)
+        return false; // level 0 commands are disabled
+
+    Option<P<AtCommandInfo>> info_ = atcommand(command);
+    P<AtCommandInfo> info = TRY_UNWRAP(info_,
+    {
+        return false; // command not found
+    });
+
+    return gmlvl.satisfies(info->level);
+}
+
 Option<Borrowed<AtCommandInfo>> atcommand(XString cmd)
 {
     if (cmd.startswith('@'))
diff --git a/src/map/atcommand.hpp b/src/map/atcommand.hpp
index 4c0e421..b77f7e5 100644
--- a/src/map/atcommand.hpp
+++ b/src/map/atcommand.hpp
@@ -30,6 +30,8 @@ namespace map
 bool is_atcommand(Session *s, dumb_ptr<map_session_data> sd,
         ZString message, GmLevel gmlvl);
 
+bool can_use_atcommand(dumb_ptr<map_session_data> sd, ZString message);
+
 bool atcommand_config_read(ZString cfgName);
 
 void log_atcommand(dumb_ptr<map_session_data> sd, ZString cmd);
diff --git a/src/map/pc.cpp b/src/map/pc.cpp
index 6b19899..77bb956 100644
--- a/src/map/pc.cpp
+++ b/src/map/pc.cpp
@@ -779,25 +779,26 @@ int pc_authok(AccountId id, int login_id2, ClientVersion client_version,
     // イベント関係の初期化
     sd->eventqueuel.clear();
 
-    // 位置の設定
-    pc_setpos(sd, sd->status.last_point.map_, sd->status.last_point.x,
-               sd->status.last_point.y, BeingRemoveWhy::GONE);
-
     {
         Opt0 old_option = sd->status.option;
         sd->status.option = Opt0::ZERO;
 
-        // This would leak information.
-        // It's better to make it obvious that players can see you.
-        if (false && bool(old_option & Opt0::INVISIBILITY))
-            is_atcommand(sd->sess, sd, "@invisible"_s, GmLevel());
+        if (bool(old_option & Opt0::INVISIBILITY) && can_use_atcommand(sd, "@invisible"_s)) {
+            // prevent leaking by first applying hide before status_change
+            sd->status.option |= Opt0::HIDE;
+            sd->status.option |= Opt0::INVISIBILITY;
+            clif_status_change(sd, StatusChange::CLIF_OPTION_SC_INVISIBILITY, 1);
+        } else if (bool(old_option & Opt0::HIDE) && can_use_atcommand(sd, "@hide"_s)) {
+            sd->status.option |= Opt0::HIDE;
+        }
 
-        if (bool(old_option & Opt0::HIDE))
-            is_atcommand(sd->sess, sd, "@hide"_s, GmLevel());
-        // atcommand_hide might already send it, but also might not
         clif_changeoption(sd);
     }
 
+    // 位置の設定
+    pc_setpos(sd, sd->status.last_point.map_, sd->status.last_point.x,
+               sd->status.last_point.y, BeingRemoveWhy::GONE);
+
     // パーティ、ギルドデータの要求
     if (sd->status.party_id
         && party_search(sd->status.party_id).is_none())
diff --git a/src/map/skill.cpp b/src/map/skill.cpp
index d9a7717..cf99af8 100644
--- a/src/map/skill.cpp
+++ b/src/map/skill.cpp
@@ -1090,7 +1090,7 @@ int skill_status_change_clear(dumb_ptr<block_list> bl, int type)
     *opt1 = Opt1::ZERO;
     *opt2 = Opt2::ZERO;
     *opt3 = Opt3::ZERO;
-    *option = Opt0::ZERO;
+    //*option = Opt0::ZERO;
 
     if (type == 0 || type & 2)
         clif_changeoption(bl);
-- 
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