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// Copyright 2015 CoreOS, Inc.
//
// 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.
package netutil
import (
"encoding/base64"
"net"
"net/http"
"net/url"
"strings"
"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/pkg/capnslog"
)
var (
plog = capnslog.NewPackageLogger("github.com/coreos/etcd/pkg", "netutil")
// indirection for testing
resolveTCPAddr = net.ResolveTCPAddr
)
// ResolveTCPAddrs is a convenience wrapper for net.ResolveTCPAddr.
// ResolveTCPAddrs resolves all DNS hostnames in-place for the given set of
// url.URLs.
func ResolveTCPAddrs(urls ...[]url.URL) error {
for _, us := range urls {
for i, u := range us {
host, _, err := net.SplitHostPort(u.Host)
if err != nil {
plog.Errorf("could not parse url %s during tcp resolving", u.Host)
return err
}
if host == "localhost" {
continue
}
if net.ParseIP(host) != nil {
continue
}
tcpAddr, err := resolveTCPAddr("tcp", u.Host)
if err != nil {
plog.Errorf("could not resolve host %s", u.Host)
return err
}
plog.Infof("resolving %s to %s", u.Host, tcpAddr.String())
us[i].Host = tcpAddr.String()
}
}
return nil
}
// BasicAuth returns the username and password provided in the request's
// Authorization header, if the request uses HTTP Basic Authentication.
// See RFC 2617, Section 2.
// Based on the BasicAuth method from the Golang standard lib.
// TODO: use the standard lib BasicAuth method when we move to Go 1.4.
func BasicAuth(r *http.Request) (username, password string, ok bool) {
auth := r.Header.Get("Authorization")
if auth == "" {
return
}
return parseBasicAuth(auth)
}
// parseBasicAuth parses an HTTP Basic Authentication string.
// "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==" returns ("Aladdin", "open sesame", true).
// Taken from the Golang standard lib.
// TODO: use the standard lib BasicAuth method when we move to Go 1.4.
func parseBasicAuth(auth string) (username, password string, ok bool) {
if !strings.HasPrefix(auth, "Basic ") {
return
}
c, err := base64.StdEncoding.DecodeString(strings.TrimPrefix(auth, "Basic "))
if err != nil {
return
}
cs := string(c)
s := strings.IndexByte(cs, ':')
if s < 0 {
return
}
return cs[:s], cs[s+1:], true
}
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