96 lines
2.8 KiB
Go
96 lines
2.8 KiB
Go
package middleware
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/*
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Copyright 2024 Jonas Kaninda
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import (
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"encoding/json"
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"github.com/gorilla/mux"
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"github.com/jkaninda/goma-gateway/pkg/logger"
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"net/http"
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"time"
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)
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// RateLimitMiddleware limits request based on the number of tokens peer minutes.
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func (rl *TokenRateLimiter) RateLimitMiddleware() mux.MiddlewareFunc {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if !rl.Allow() {
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// Rate limit exceeded, return a 429 Too Many Requests response
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusTooManyRequests)
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err := json.NewEncoder(w).Encode(ProxyResponseError{
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Success: false,
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Code: http.StatusTooManyRequests,
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Message: "Too many requests, API rate limit exceeded. Please try again later.",
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})
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if err != nil {
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return
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}
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return
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}
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// Proceed to the next handler if rate limit is not exceeded
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next.ServeHTTP(w, r)
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})
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}
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}
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// RateLimitMiddleware limits request based on the number of requests peer minutes.
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func (rl *RateLimiter) RateLimitMiddleware() mux.MiddlewareFunc {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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clientID := getRealIP(r)
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rl.mu.Lock()
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client, exists := rl.ClientMap[clientID]
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if !exists || time.Now().After(client.ExpiresAt) {
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client = &Client{
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RequestCount: 0,
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ExpiresAt: time.Now().Add(rl.Window),
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}
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rl.ClientMap[clientID] = client
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}
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client.RequestCount++
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rl.mu.Unlock()
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if client.RequestCount > rl.Requests {
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logger.Error("Too many requests from IP: %s %s %s", clientID, r.URL, r.UserAgent())
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusTooManyRequests)
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err := json.NewEncoder(w).Encode(ProxyResponseError{
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Success: false,
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Code: http.StatusTooManyRequests,
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Message: "Too many requests, API rate limit exceeded. Please try again later.",
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})
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if err != nil {
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return
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}
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return
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}
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// Proceed to the next handler if rate limit is not exceeded
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next.ServeHTTP(w, r)
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})
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}
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}
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func getRealIP(r *http.Request) string {
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if ip := r.Header.Get("X-Real-IP"); ip != "" {
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return ip
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}
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if ip := r.Header.Get("X-Forwarded-For"); ip != "" {
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return ip
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}
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return r.RemoteAddr
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}
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