tidb auth 源码
tidb auth 代码
文件路径：/parser/auth/auth.go
// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package auth
import (
"fmt"
"github.com/pingcap/tidb/parser/format"
)
const (
// UserNameMaxLength is the max length of username.
UserNameMaxLength = 32
// HostNameMaxLength is the max length of host name.
HostNameMaxLength = 255
)
// UserIdentity represents username and hostname.
type UserIdentity struct {
Username string
Hostname string
CurrentUser bool
AuthUsername string // Username matched in privileges system
AuthHostname string // Match in privs system (i.e. could be a wildcard)
}
// Restore implements Node interface.
func (user *UserIdentity) Restore(ctx *format.RestoreCtx) error {
if user.CurrentUser {
ctx.WriteKeyWord("CURRENT_USER")
} else {
ctx.WriteName(user.Username)
ctx.WritePlain("@")
ctx.WriteName(user.Hostname)
}
return nil
}
// String converts UserIdentity to the format user@host.
// It defaults to providing the AuthIdentity (the matching entry in priv tables)
// To use the actual identity use LoginString()
func (user *UserIdentity) String() string {
// TODO: Escape username and hostname.
if user == nil {
return ""
}
if user.AuthUsername != "" {
return fmt.Sprintf("%s@%s", user.AuthUsername, user.AuthHostname)
}
return fmt.Sprintf("%s@%s", user.Username, user.Hostname)
}
// LoginString returns matched identity in user@host format
// It matches the login user.
func (user *UserIdentity) LoginString() string {
// TODO: Escape username and hostname.
if user == nil {
return ""
}
return fmt.Sprintf("%s@%s", user.Username, user.Hostname)
}
// RoleIdentity represents a role name.
type RoleIdentity struct {
Username string
Hostname string
}
// Restore implements Node interface.
func (role *RoleIdentity) Restore(ctx *format.RestoreCtx) error {
ctx.WriteName(role.Username)
if role.Hostname != "" {
ctx.WritePlain("@")
ctx.WriteName(role.Hostname)
}
return nil
}
// String converts UserIdentity to the format user@host.
func (role *RoleIdentity) String() string {
// TODO: Escape username and hostname.
return fmt.Sprintf("`%s`@`%s`", role.Username, role.Hostname)
}
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