fix #1490

Track channel join times, use them to optionally enforce history access
restrictions

irc/types.go

@@ -5,7 +5,11 @@
 
 package irc
 
-import "github.com/oragono/oragono/irc/modes"
+import (
+	"time"
+
+	"github.com/oragono/oragono/irc/modes"
+)
 
 type empty struct{}
 
@@ -28,12 +32,20 @@ func (clients ClientSet) Has(client *Client) bool {
 	return ok
 }
 
+type memberData struct {
+	modes    *modes.ModeSet
+	joinTime int64
+}
+
 // MemberSet is a set of members with modes.
-type MemberSet map[*Client]*modes.ModeSet
+type MemberSet map[*Client]memberData
 
 // Add adds the given client to this set.
 func (members MemberSet) Add(member *Client) {
-	members[member] = modes.NewModeSet()
+	members[member] = memberData{
+		modes:    modes.NewModeSet(),
+		joinTime: time.Now().UnixNano(),
+	}
 }
 
 // Remove removes the given client from this set.
@@ -47,15 +59,5 @@ func (members MemberSet) Has(member *Client) bool {
 	return ok
 }
 
-// AnyHasMode returns true if any of our clients has the given mode.
-func (members MemberSet) AnyHasMode(mode modes.Mode) bool {
-	for _, modes := range members {
-		if modes.HasMode(mode) {
-			return true
-		}
-	}
-	return false
-}
-
 // ChannelSet is a set of channels.
 type ChannelSet map[*Channel]empty