100 lines
2.8 KiB
Go
100 lines
2.8 KiB
Go
package middleware
|
|
|
|
/*
|
|
Copyright 2024 Jonas Kaninda
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"github.com/jkaninda/goma-gateway/internal/logger"
|
|
"github.com/jkaninda/goma-gateway/util"
|
|
"net/http"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
// BlocklistMiddleware checks if the request path is forbidden and returns 403 Forbidden
|
|
func (blockList BlockListMiddleware) BlocklistMiddleware(next http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
for _, block := range blockList.List {
|
|
if isPathBlocked(r.URL.Path, util.ParseURLPath(blockList.Path+block)) {
|
|
logger.Error("Access to %s is forbidden", r.URL.Path)
|
|
w.Header().Set("Content-Type", "application/json")
|
|
w.WriteHeader(http.StatusNotFound)
|
|
err := json.NewEncoder(w).Encode(ProxyResponseError{
|
|
Success: false,
|
|
Code: http.StatusNotFound,
|
|
Message: fmt.Sprintf("Not found: %s", r.URL.Path),
|
|
})
|
|
if err != nil {
|
|
return
|
|
}
|
|
return
|
|
}
|
|
}
|
|
next.ServeHTTP(w, r)
|
|
})
|
|
}
|
|
|
|
// Helper function to determine if the request path is blocked
|
|
func isPathBlocked(requestPath, blockedPath string) bool {
|
|
// Handle exact match
|
|
if requestPath == blockedPath {
|
|
return true
|
|
}
|
|
// Handle wildcard match (e.g., /admin/* should block /admin and any subpath)
|
|
if strings.HasSuffix(blockedPath, "/*") {
|
|
basePath := strings.TrimSuffix(blockedPath, "/*")
|
|
if strings.HasPrefix(requestPath, basePath) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// NewRateLimiter creates a new rate limiter with the specified refill rate and token capacity
|
|
func NewRateLimiter(maxTokens int, refillRate time.Duration) *TokenRateLimiter {
|
|
return &TokenRateLimiter{
|
|
tokens: maxTokens,
|
|
maxTokens: maxTokens,
|
|
refillRate: refillRate,
|
|
lastRefill: time.Now(),
|
|
}
|
|
}
|
|
|
|
// Allow checks if a request is allowed based on the current token bucket
|
|
func (rl *TokenRateLimiter) Allow() bool {
|
|
rl.mu.Lock()
|
|
defer rl.mu.Unlock()
|
|
|
|
// Refill tokens based on the time elapsed
|
|
now := time.Now()
|
|
elapsed := now.Sub(rl.lastRefill)
|
|
tokensToAdd := int(elapsed / rl.refillRate)
|
|
if tokensToAdd > 0 {
|
|
rl.tokens = min(rl.maxTokens, rl.tokens+tokensToAdd)
|
|
rl.lastRefill = now
|
|
}
|
|
|
|
// Check if there are enough tokens to allow the request
|
|
if rl.tokens > 0 {
|
|
rl.tokens--
|
|
return true
|
|
}
|
|
|
|
// Reject request if no tokens are available
|
|
return false
|
|
}
|