Feat: add models/cache/config

models/auth.go

@@ -0,0 +1,25 @@
+package models
+
+import (
+	"time"
+)
+
+// each session contains the username of the user and the time at which it expires
+type Session struct {
+	Username    string
+	CurrentRoom string
+	Expiry      time.Time
+}
+
+// we'll use this method later to determine if the session has expired
+func (s Session) IsExpired() bool {
+	return s.Expiry.Before(time.Now())
+}
+
+func ListUsernames(ss map[string]*Session) []string {
+	resp := make([]string, 0, len(ss))
+	for _, s := range ss {
+		resp = append(resp, s.Username)
+	}
+	return resp
+}