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csrf.go
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csrf.go
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package csrf
import (
"net/http"
"strings"
"time"
"github.com/gogf/gf/v2/net/ghttp"
"github.com/gogf/gf/v2/util/grand"
)
// Config is the configuration struct for CSRF feature.
type Config struct {
TokenLength int
TokenRequestKey string
ExpireTime time.Duration
Cookie *http.Cookie
}
var (
// DefaultCSRFConfig is the default CSRF middleware config.
DefaultCSRFConfig = Config{
Cookie: &http.Cookie{
Name: "_csrf",
},
ExpireTime: time.Hour * 24,
TokenLength: 32,
TokenRequestKey: "X-CSRF-Token",
}
)
// New creates and returns a CSRF middleware with default configuration.
func New() func(r *ghttp.Request) {
return NewWithCfg(DefaultCSRFConfig)
}
// NewWithCfg creates and returns a CSRF middleware with incoming configuration.
func NewWithCfg(cfg Config) func(r *ghttp.Request) {
return func(r *ghttp.Request) {
// Read the token in the request cookie
tokenInCookie := r.Cookie.Get(cfg.Cookie.Name).String()
if tokenInCookie == "" {
// Generate a random token
tokenInCookie = grand.S(cfg.TokenLength)
}
// Read the token attached to the request
// Read priority: Router < Query < Body < Form < Custom < Header
tokenInRequestData := r.Header.Get(cfg.TokenRequestKey)
if tokenInRequestData == "" {
tokenInRequestData = r.GetRequest(cfg.TokenRequestKey).String()
}
switch r.Method {
case http.MethodGet, http.MethodHead, http.MethodOptions, http.MethodTrace:
// No verification required
default:
// Authentication token
if !strings.EqualFold(tokenInCookie, tokenInRequestData) {
r.Response.WriteStatusExit(http.StatusForbidden, "invalid CSRF token")
return
}
}
// Set cookie timeout
cfg.Cookie.Expires = time.Now().Add(cfg.ExpireTime)
cfg.Cookie.Value = tokenInCookie
// Set cookie in response
http.SetCookie(r.Response.RawWriter(), cfg.Cookie)
r.Middleware.Next()
}
}