63 lines
1.9 KiB
Go
63 lines
1.9 KiB
Go
/*
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* Copyright 2024 Jonas Kaninda
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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*/
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package middlewares
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import (
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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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)
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type AccessPolicy struct {
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Action string
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SourceRanges []string
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}
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func (access AccessPolicy) AccessPolicyMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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iPs := make(map[string]struct{})
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for _, ip := range access.SourceRanges {
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iPs[ip] = struct{}{}
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}
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// Get the client's IP address
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ip, _, err := net.SplitHostPort(getRealIP(r))
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if err != nil {
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logger.Error("Unable to parse IP address")
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RespondWithError(w, http.StatusUnauthorized, "Unable to parse IP address")
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return
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}
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// Check if the IP is in the blocklist
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if access.Action == "DENY" {
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if _, ok := iPs[ip]; ok {
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logger.Error(" %s: IP address in the blocklist, access not allowed", getRealIP(r))
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RespondWithError(w, http.StatusForbidden, http.StatusText(http.StatusForbidden))
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return
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}
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}
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// Check if the IP is in the allowlist
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if _, ok := iPs[ip]; !ok {
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logger.Error("%s: IP address not allowed ", getRealIP(r))
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RespondWithError(w, http.StatusForbidden, http.StatusText(http.StatusForbidden))
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return
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}
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// Continue to the next handler if the authentication is successful
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next.ServeHTTP(w, r)
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})
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}
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