Merge branch 'alpha' into refactor_error

# Conflicts:
#	controller/channel.go
#	middleware/distributor.go
#	model/channel.go
#	model/user.go
#	model/user_cache.go
#	relay/common/relay_info.go

common/str.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"encoding/base64"
 	"encoding/json"
 	"math/rand"
 	"strconv"
@@ -82,3 +83,15 @@ func StringToByteSlice(s string) []byte {
 	tmp2 := [3]uintptr{tmp1[0], tmp1[1], tmp1[1]}
 	return *(*[]byte)(unsafe.Pointer(&tmp2))
 }
+
+func EncodeBase64(str string) string {
+	return base64.StdEncoding.EncodeToString([]byte(str))
+}
+
+func GetJsonString(data any) string {
+	if data == nil {
+		return ""
+	}
+	b, _ := json.Marshal(data)
+	return string(b)
+}