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// Copyright 2015 The appc Authors
//
// 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 discovery
import (
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"net/url"
"strconv"
"time"
)
type InsecureOption int
const (
defaultDialTimeout = 20 * time.Second
)
const (
InsecureNone InsecureOption = 0
InsecureTLS InsecureOption = 1 << iota
InsecureHTTP
)
var (
// Client is the default http.Client used for discovery requests.
Client *http.Client
ClientInsecureTLS *http.Client
// httpDo is the internal object used by discovery to retrieve URLs; it is
// defined here so it can be overridden for testing
httpDo httpDoer
httpDoInsecureTLS httpDoer
)
// httpDoer is an interface used to wrap http.Client for real requests and
// allow easy mocking in local tests.
type httpDoer interface {
Do(req *http.Request) (resp *http.Response, err error)
}
func init() {
t := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: func(n, a string) (net.Conn, error) {
return net.DialTimeout(n, a, defaultDialTimeout)
},
}
Client = &http.Client{
Transport: t,
}
httpDo = Client
// copy for InsecureTLS
tInsecureTLS := http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: func(n, a string) (net.Conn, error) {
return net.DialTimeout(n, a, defaultDialTimeout)
},
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
ClientInsecureTLS = &http.Client{
Transport: &tInsecureTLS,
}
httpDoInsecureTLS = ClientInsecureTLS
}
func httpsOrHTTP(name string, hostHeaders map[string]http.Header, insecure InsecureOption, port uint) (urlStr string, body io.ReadCloser, err error) {
fetch := func(scheme string, port uint) (urlStr string, res *http.Response, err error) {
u, err := url.Parse(scheme + "://" + name)
if err != nil {
return "", nil, err
}
u.RawQuery = "ac-discovery=1"
if port != 0 {
u.Host += ":" + strconv.FormatUint(uint64(port), 10)
}
urlStr = u.String()
req, err := http.NewRequest("GET", urlStr, nil)
if err != nil {
return "", nil, err
}
if hostHeader, ok := hostHeaders[u.Host]; ok {
req.Header = hostHeader
}
if insecure&InsecureTLS != 0 {
res, err = httpDoInsecureTLS.Do(req)
return
}
res, err = httpDo.Do(req)
return
}
closeBody := func(res *http.Response) {
if res != nil {
res.Body.Close()
}
}
urlStr, res, err := fetch("https", port)
if err != nil || res.StatusCode != http.StatusOK {
if insecure&InsecureHTTP != 0 {
closeBody(res)
urlStr, res, err = fetch("http", port)
}
}
if res != nil && res.StatusCode != http.StatusOK {
err = fmt.Errorf("expected a 200 OK got %d", res.StatusCode)
}
if err != nil {
closeBody(res)
return "", nil, err
}
return urlStr, res.Body, nil
}
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