92 lines
2.1 KiB
Go
92 lines
2.1 KiB
Go
/*
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* Copyright 2022 The Dragonfly Authors
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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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package http
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import (
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"fmt"
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"net"
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"net/http"
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"syscall"
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"time"
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)
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const (
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// DefaultDialTimeout is the default timeout for dialing a http connection.
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DefaultDialTimeout = 30 * time.Second
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)
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// HeaderToMap coverts request headers to map[string]string.
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func HeaderToMap(header http.Header) map[string]string {
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m := make(map[string]string)
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for k, v := range header {
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m[k] = v[0]
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}
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return m
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}
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// MapToHeader coverts map[string]string to request headers.
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func MapToHeader(m map[string]string) http.Header {
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var h = http.Header{}
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for k, v := range m {
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h.Set(k, v)
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}
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return h
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}
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// PickHeader pick header with key.
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func PickHeader(header http.Header, key, defaultValue string) string {
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v := header.Get(key)
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if v != "" {
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header.Del(key)
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return v
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}
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return defaultValue
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}
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// NewSafeDialer returns a new net.Dialer with safe socket control.
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func NewSafeDialer() *net.Dialer {
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return &net.Dialer{
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Timeout: DefaultDialTimeout,
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DualStack: true,
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Control: safeSocketControl,
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}
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}
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// safeSocketControl restricts the socket to only connect to valid addresses.
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func safeSocketControl(network string, address string, conn syscall.RawConn) error {
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if !(network == "tcp4" || network == "tcp6") {
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return fmt.Errorf("network type %s is invalid", network)
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}
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host, _, err := net.SplitHostPort(address)
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if err != nil {
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return err
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}
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ip := net.ParseIP(host)
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if ip == nil {
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return fmt.Errorf("host %s is invalid", host)
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}
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if !ip.IsGlobalUnicast() {
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return fmt.Errorf("ip %s is invalid", ip.String())
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}
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return nil
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}
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