golang gin使用记录

github.com/gin-contrib/sessions教程

gitHub: https://github.com/gin-contrib/sessions

使用参考：https://blog.csdn.net/qq_16763983/article/details/105049118

Gin Mode的选择

1	gin.SetMode(gin.ReleaseMode)

gin框架提供了下列三种模式。这三种mode分别对应了不同的场景。在我们开发调试过程中，使用debug模式就可以了。在上线的时候，一定要选择release模式。而test可以用在测试场景中。

const (
// DebugMode indicates gin mode is debug.
DebugMode = “debug”
// ReleaseMode indicates gin mode is release.
ReleaseMode = “release”
// TestMode indicates gin mode is test.
TestMode = “test”
)

golang jwt+token验证

Go实战–golang中使用JWT(JSON Web Token)
Golang 实现JWT认证

gin框架中自定义向log中写入调试信息

How to write log file

func main() {
    // Disable Console Color, you don't need console color when writing the logs to file.
    gin.DisableConsoleColor()
 
    // Logging to a file.
    f, _ := os.Create("gin.log")
    gin.DefaultWriter = io.MultiWriter(f)
 
    // Use the following code if you need to write the logs to file and console at the same time.
    // gin.DefaultWriter = io.MultiWriter(f, os.Stdout)
 
    router := gin.Default()
    router.GET("/ping", func(c *gin.Context) {
        c.String(200, "pong")
    })
 
    router.Run(":8080")
}

可以看到gin是通过DefaultWriter来确定日志写入的，查看代码(gin/mode.go中)如下：

// DefaultWriter is the default io.Writer used the Gin for debug output and
// middleware output like Logger() or Recovery().
// Note that both Logger and Recovery provides custom ways to configure their
// output io.Writer.
// To support coloring in Windows use:
// import "github.com/mattn/go-colorable"
// gin.DefaultWriter = colorable.NewColorableStdout()
var DefaultWriter io.Writer = os.Stdout
var DefaultErrorWriter io.Writer = os.Stderr

基于Token的身份验证的原理

参考：https://www.cnblogs.com/wnvalentin/articles/10816221.html

csrf token 生成与验证是如何做的呢？

服务器会在cookie中保存一个csrf_token_key, 用作钥匙。
服务器会在页面生成时，获取csrf_token_key这个钥匙, 生成一个随机的csrf_token令牌，当表单提交时，获取到csrf_token通过csrf_token_key解密比较是否一致。

Gin框架自定义解析json中的时间

import (
    "fmt"
    "saasMigrateProject/go2cloud_platform/settings"
    
    "time"
)

type Datetime time.Time

func (t Datetime) MarshalJSON() ([]byte, error) {
    var stamp = fmt.Sprintf("\"%v\"", time.Time(t).Format(settings.TimeFormat))
    return []byte(stamp), nil
}

func (t *Datetime) UnmarshalJSON(data []byte) error {
    timeStr := string(data)
    if timeStr == "null" {
        return nil
    }
    tm, err := time.Parse(settings.TimeFormat, timeStr)
    *t = Datetime(tm)
    return err
}

func (t Datetime) Value() time.Time {
   return time.Time(t)
}

func (t Datetime) Now() Datetime {
    return Datetime(time.Now())
}