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ip_filter.go
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ip_filter.go
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// Copyright 2016 HenryLee. All Rights Reserved.
//
// 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.
// define common middlewares.
package middleware
import (
"net/http"
"strings"
"github.com/henrylee2cn/faygo"
)
// NewIPFilter creates middleware that intercepts the specified IP prefix.
func NewIPFilter(whitelist []string, realIP bool) faygo.HandlerFunc {
var noAccess bool
var match []string
var prefix []string
if len(whitelist) == 0 {
noAccess = true
} else {
for _, s := range whitelist {
if strings.HasSuffix(s, "*") {
prefix = append(prefix, s[:len(s)-1])
} else {
match = append(match, s)
}
}
}
return func(ctx *faygo.Context) error {
if noAccess {
ctx.Error(http.StatusForbidden, "no access")
return nil
}
var ip string
if realIP {
ip = ctx.RealIP()
} else {
ip = ctx.IP()
}
for _, ipMatch := range match {
if ipMatch == ip {
ctx.Next()
return nil
}
}
for _, ipPrefix := range prefix {
if strings.HasPrefix(ip, ipPrefix) {
ctx.Next()
return nil
}
}
ctx.Error(http.StatusForbidden, "not allow to access: "+ip)
return nil
}
}