mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
138 lines
3.5 KiB
Go
138 lines
3.5 KiB
Go
// Copyright 2015 CoreOS, Inc.
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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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package netutil
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import (
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"encoding/base64"
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"log"
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"net"
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"net/http"
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"net/url"
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"reflect"
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"strings"
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)
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var (
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// indirection for testing
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resolveTCPAddr = net.ResolveTCPAddr
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)
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// ResolveTCPAddrs is a convenience wrapper for net.ResolveTCPAddr.
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// ResolveTCPAddrs resolves all DNS hostnames in-place for the given set of
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// url.URLs.
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func ResolveTCPAddrs(urls ...[]url.URL) error {
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for _, us := range urls {
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for i, u := range us {
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host, _, err := net.SplitHostPort(u.Host)
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if err != nil {
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log.Printf("netutil: Could not parse url %s during tcp resolving.", u.Host)
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return err
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}
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if host == "localhost" {
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continue
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}
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if net.ParseIP(host) != nil {
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continue
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}
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tcpAddr, err := resolveTCPAddr("tcp", u.Host)
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if err != nil {
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log.Printf("netutil: Could not resolve host: %s", u.Host)
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return err
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}
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log.Printf("netutil: Resolving %s to %s", u.Host, tcpAddr.String())
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us[i].Host = tcpAddr.String()
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}
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}
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return nil
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}
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// URLsEqual checks equality of url.URLS between two arrays.
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// This check pass even if an URL is in hostname and opposite is in IP address.
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func URLsEqual(a []url.URL, b []url.URL) bool {
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if len(a) != len(b) {
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return false
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}
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for i, urlA := range a {
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urlB := b[i]
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if !reflect.DeepEqual(urlA, urlB) {
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urls := []url.URL{urlA, urlB}
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ResolveTCPAddrs(urls)
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if !reflect.DeepEqual(urls[0], urls[1]) {
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return false
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}
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}
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}
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return true
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}
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func URLStringsEqual(a []string, b []string) bool {
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if len(a) != len(b) {
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return false
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}
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urlsA := make([]url.URL, len(a))
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for _, str := range a {
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u, err := url.Parse(str)
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if err != nil {
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return false
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}
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urlsA = append(urlsA, *u)
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}
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urlsB := make([]url.URL, len(b))
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for _, str := range b {
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u, err := url.Parse(str)
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if err != nil {
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return false
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}
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urlsB = append(urlsB, *u)
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}
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return URLsEqual(urlsA, urlsB)
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}
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// BasicAuth returns the username and password provided in the request's
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// Authorization header, if the request uses HTTP Basic Authentication.
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// See RFC 2617, Section 2.
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// Based on the BasicAuth method from the Golang standard lib.
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// TODO: use the standard lib BasicAuth method when we move to Go 1.4.
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func BasicAuth(r *http.Request) (username, password string, ok bool) {
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auth := r.Header.Get("Authorization")
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if auth == "" {
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return
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}
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return parseBasicAuth(auth)
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}
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// parseBasicAuth parses an HTTP Basic Authentication string.
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// "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==" returns ("Aladdin", "open sesame", true).
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// Taken from the Golang standard lib.
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// TODO: use the standard lib BasicAuth method when we move to Go 1.4.
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func parseBasicAuth(auth string) (username, password string, ok bool) {
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if !strings.HasPrefix(auth, "Basic ") {
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return
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}
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c, err := base64.StdEncoding.DecodeString(strings.TrimPrefix(auth, "Basic "))
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if err != nil {
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return
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}
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cs := string(c)
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s := strings.IndexByte(cs, ':')
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if s < 0 {
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return
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}
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return cs[:s], cs[s+1:], true
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}
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