54 lines
907 B
Go
54 lines
907 B
Go
package middleware
|
|
|
|
import (
|
|
"net/http"
|
|
"sync"
|
|
|
|
"github.com/gin-gonic/gin"
|
|
"golang.org/x/time/rate"
|
|
)
|
|
|
|
type IPRateLimiter struct {
|
|
ips map[string]*rate.Limiter
|
|
mu *sync.RWMutex
|
|
r rate.Limit
|
|
b int
|
|
}
|
|
|
|
func NewIPRateLimiter(r rate.Limit, b int) *IPRateLimiter {
|
|
return &IPRateLimiter{
|
|
ips: make(map[string]*rate.Limiter),
|
|
mu: &sync.RWMutex{},
|
|
r: r,
|
|
b: b,
|
|
}
|
|
}
|
|
|
|
func (i *IPRateLimiter) GetLimiter(ip string) *rate.Limiter {
|
|
i.mu.Lock()
|
|
defer i.mu.Unlock()
|
|
|
|
limiter, exists := i.ips[ip]
|
|
if !exists {
|
|
limiter = rate.NewLimiter(i.r, i.b)
|
|
i.ips[ip] = limiter
|
|
}
|
|
|
|
return limiter
|
|
}
|
|
|
|
func RateLimit(limiter *IPRateLimiter) gin.HandlerFunc {
|
|
return func(c *gin.Context) {
|
|
ip := c.ClientIP()
|
|
if !limiter.GetLimiter(ip).Allow() {
|
|
c.JSON(http.StatusTooManyRequests, gin.H{
|
|
"code": 429,
|
|
"message": "too many requests",
|
|
})
|
|
c.Abort()
|
|
return
|
|
}
|
|
c.Next()
|
|
}
|
|
}
|