MORE REFACTORING!! + some improvements

Signed-off-by: ari melody <ari@arimelody.me>

admin/admin.go

@@ -0,0 +1,47 @@
+package admin
+
+import (
+	"fmt"
+	"math/rand"
+	"os"
+	"time"
+)
+
+type (
+    Session struct {
+        UserID string
+        Token string
+        Expires int64
+    }
+)
+
+const TOKEN_LENGTH = 64
+const TOKEN_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
+var ADMIN_ID_DISCORD = func() string {
+    envvar := os.Getenv("DISCORD_ADMIN_ID")
+    if envvar == "" {
+        fmt.Printf("DISCORD_ADMIN_ID was not provided. Admin login will be unavailable.\n")
+    }
+    return envvar
+}()
+
+var sessions []*Session
+
+func createSession(UserID string) Session {
+    return Session{
+        UserID: UserID,
+        Token: string(generateToken()),
+        Expires: time.Now().Add(24 * time.Hour).Unix(),
+    }
+}
+
+func generateToken() string {
+    var token []byte
+
+    for i := 0; i < TOKEN_LENGTH; i++ {
+        token = append(token, TOKEN_CHARS[rand.Intn(len(TOKEN_CHARS))])
+    }
+
+    return string(token)
+}