97 lines
3.2 KiB
Go
97 lines
3.2 KiB
Go
package middlewares
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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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"fmt"
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"github.com/gorilla/mux"
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"github.com/jkaninda/goma-gateway/pkg/logger"
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"net"
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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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logger.Error("Too many requests from IP: %s %s %s", getRealIP(r), r.URL, r.UserAgent())
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// Rate limit exceeded, return a 429 Too Many Requests response
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w.WriteHeader(http.StatusTooManyRequests)
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_, err := w.Write([]byte(fmt.Sprintf("%d Too many requests, API requests limit exceeded. Please try again later", http.StatusTooManyRequests)))
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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 requests 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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window := time.Minute // requests per minute
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if len(rl.unit) != 0 && rl.unit == "hour" {
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window = time.Hour
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}
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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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// Get the client's IP address
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clientIP, _, err := net.SplitHostPort(getRealIP(r))
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if err != nil {
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clientIP = getRealIP(r)
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}
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clientID := fmt.Sprintf("%s-%s", rl.id, clientIP) // Generate client Id, ID+ route ID
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if rl.redisBased {
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err := redisRateLimiter(clientID, rl.unit, rl.requests)
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if err != nil {
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logger.Error("Redis Rate limiter error: %s", err.Error())
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logger.Error("Too many requests from IP: %s %s %s", clientIP, r.URL, r.UserAgent())
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return
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}
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} else {
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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(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", clientIP, r.URL, r.UserAgent())
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// Update Origin Cors Headers
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if allowedOrigin(rl.origins, r.Header.Get("Origin")) {
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w.Header().Set("Access-Control-Allow-Origin", r.Header.Get("Origin"))
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}
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RespondWithError(w, http.StatusTooManyRequests, fmt.Sprintf("%d Too many requests, API requests limit exceeded. Please try again later", http.StatusTooManyRequests))
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return
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}
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}
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// Proceed to the next handler if the request 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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