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go - 如何读取cookie?

转载 作者:数据小太阳 更新时间:2023-10-29 03:32:25 26 4
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我通过 javascript 设置了一个 cookie,例如:

setCookie("appointment", JSON.stringify({
appointmentDate: selectedDay.date,
appointmentStartMn: appointment.mnRange[0],
appointmentId: appointment.id || 0,
appointmentUserId: appointment.user.id || 0
})
);

设置 cookie 后,我想将用户重定向到预订页面:

window.location.href = "https://localhost:8080/booking/"

setCookie 函数:

function setCookie(cookieName, cookieValue) {
document.cookie = `${cookieName}=${cookieValue};secure;`;
}

我想从我的 go 后端检索那个 cookie,但我不知道该怎么做。我读过这个问题,因为我以前从未使用过 cookie,但答案似乎告诉我,除了设置 document.cookie 之外,我不需要做太多事情。

在我的浏览器存储中,我可以看到 cookie 确实按预期设置了。

在我的 Go 后端,我想打印 cookie:

r.HandleFunc("/booking/", handler.serveTemplate)

func (handler *templateHandler) serveTemplate(w http.ResponseWriter, r *http.Request) {
c, err := r.Cookie("appointment")
if err != nil {
fmt.Println(err.Error())
} else {
fmt.Println(c.Value)
}
}

//output http: named cookie not present

我缺少的具体内容是什么?我想我混淆了 local/http cookie 但如何实现客户端设置 cookie 的读取?

更新(查看更多答案)

与golang无关。我的:

appointmentDate: selectedDay.date

格式为2019-01-01-的内容不是可以发送到后端的有效字符。它适用于我的浏览器,但需要对 URI 进行编码才能传递。

所以这就成功了:

`${cookieName}=${encodeURIComponent(cookieValue)};secure;` + "path=/";`

然后继续(为了节省空间没有在这里捕获错误):

cookie, _ := r.Cookie("appointment")
data, _ := url.QueryUnescape(cookie.Value)

最佳答案

例如,更好的方法是将您的 json 编码为 base64。我做了一个工作示例...

主.go

package main

import (
"encoding/base64"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
)

// Contains everything about an appointment
type Appointment struct {
Date string `json:"appointmentDate"` // Contains date as string
StartMn string `json:"appointmentStartMn"` // Our startMn ?
ID int `json:"appointmentId"` // AppointmentId
UserID int `json:"appointmentUserId"` // UserId
}

func main() {
handler := http.NewServeMux()

// Main request
handler.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
fmt.Printf("Requested /\r\n")

// set typical headers
w.Header().Set("Content-Type", "text/html")
w.WriteHeader(http.StatusOK)

// Read file
b, _ := ioutil.ReadFile("index.html")
io.WriteString(w, string(b))
})

// booking request
handler.HandleFunc("/booking/", func(w http.ResponseWriter, r *http.Request) {
fmt.Printf("Requested /booking/\r\n")

// set typical headers
w.Header().Set("Content-Type", "text/html")
w.WriteHeader(http.StatusOK)

// Read cookie
cookie, err := r.Cookie("appointment")
if err != nil {
fmt.Printf("Cant find cookie :/\r\n")
return
}

fmt.Printf("%s=%s\r\n", cookie.Name, cookie.Value)

// Cookie data
data, err := base64.StdEncoding.DecodeString(cookie.Value)
if err != nil {
fmt.Printf("Error:", err)
}

var appointment Appointment
er := json.Unmarshal(data, &appointment)
if err != nil {
fmt.Printf("Error: ", er)
}

fmt.Printf("%s, %s, %d, %d\r\n", appointment.Date, appointment.StartMn, appointment.ID, appointment.UserID)

// Read file
b, _ := ioutil.ReadFile("booking.html")
io.WriteString(w, string(b))
})

// Serve :)
http.ListenAndServe(":8080", handler)
}

index.html

<html>
<head>
<title>Your page</title>
</head>
<body>
Setting cookie via Javascript

<script type="text/javascript">
window.onload = () => {
function setCookie(name, value, days) {
var expires = "";
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days*24*60*60*1000));
expires = "; expires=" + date.toUTCString();
}
document.cookie = name + "=" + btoa((value || "")) + expires + "; path=/";
}

setCookie("appointment", JSON.stringify({
appointmentDate: "20-01-2019 13:06",
appointmentStartMn: "1-2",
appointmentId: 2,
appointmentUserId: 3
})
);

document.location = "/booking/";
}
</script>
</body>

预订.html

<html>
<head>
<title>Your page</title>
</head>
<body>
Your booking is okay :)
</body>

关于go - 如何读取cookie?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54275704/

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