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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !cmd_go_bootstrap
// This code is compiled into the real 'go' binary, but it is not
// compiled into the binary that is built during all.bash, so as
// to avoid needing to build net (and thus use cgo) during the
// bootstrap process.
package web
import (
"crypto/tls"
"fmt"
"io/ioutil"
"net/http"
urlpkg "net/url"
"os"
"strings"
"time"
"cmd/go/internal/auth"
"cmd/go/internal/cfg"
"cmd/internal/browser"
)
// impatientInsecureHTTPClient is used in -insecure mode,
// when we're connecting to https servers that might not be there
// or might be using self-signed certificates.
var impatientInsecureHTTPClient = &http.Client{
Timeout: 5 * time.Second,
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
},
}
// securityPreservingHTTPClient is like the default HTTP client, but rejects
// redirects to plain-HTTP URLs if the original URL was secure.
var securityPreservingHTTPClient = &http.Client{
CheckRedirect: func(req *http.Request, via []*http.Request) error {
if len(via) > 0 && via[0].URL.Scheme == "https" && req.URL.Scheme != "https" {
lastHop := via[len(via)-1].URL
return fmt.Errorf("redirected from secure URL %s to insecure URL %s", lastHop, req.URL)
}
return nil
},
}
func get(security SecurityMode, url *urlpkg.URL) (*Response, error) {
start := time.Now()
if url.Scheme == "file" {
return getFile(url)
}
if os.Getenv("TESTGOPROXY404") == "1" && url.Host == "proxy.golang.org" {
res := &Response{
URL: Redacted(url),
Status: "404 testing",
StatusCode: 404,
Header: make(map[string][]string),
Body: ioutil.NopCloser(strings.NewReader("")),
}
if cfg.BuildX {
fmt.Fprintf(os.Stderr, "# get %s: %v (%.3fs)\n", Redacted(url), res.Status, time.Since(start).Seconds())
}
return res, nil
}
fetch := func(url *urlpkg.URL) (*urlpkg.URL, *http.Response, error) {
// Note: The -v build flag does not mean "print logging information",
// despite its historical misuse for this in GOPATH-based go get.
// We print extra logging in -x mode instead, which traces what
// commands are executed.
if cfg.BuildX {
fmt.Fprintf(os.Stderr, "# get %s\n", Redacted(url))
}
req, err := http.NewRequest("GET", url.String(), nil)
if err != nil {
return nil, nil, err
}
if url.Scheme == "https" {
auth.AddCredentials(req)
}
var res *http.Response
if security == Insecure && url.Scheme == "https" { // fail earlier
res, err = impatientInsecureHTTPClient.Do(req)
} else {
res, err = securityPreservingHTTPClient.Do(req)
}
return url, res, err
}
var (
fetched *urlpkg.URL
res *http.Response
err error
)
if url.Scheme == "" || url.Scheme == "https" {
secure := new(urlpkg.URL)
*secure = *url
secure.Scheme = "https"
fetched, res, err = fetch(secure)
if err != nil {
if cfg.BuildX {
fmt.Fprintf(os.Stderr, "# get %s: %v\n", Redacted(url), err)
}
if security != Insecure || url.Scheme == "https" {
// HTTPS failed, and we can't fall back to plain HTTP.
// Report the error from the HTTPS attempt.
return nil, err
}
}
}
if res == nil {
switch url.Scheme {
case "http":
if security == SecureOnly {
if cfg.BuildX {
fmt.Fprintf(os.Stderr, "# get %s: insecure\n", Redacted(url))
}
return nil, fmt.Errorf("insecure URL: %s", Redacted(url))
}
case "":
if security != Insecure {
panic("should have returned after HTTPS failure")
}
default:
if cfg.BuildX {
fmt.Fprintf(os.Stderr, "# get %s: unsupported\n", Redacted(url))
}
return nil, fmt.Errorf("unsupported scheme: %s", Redacted(url))
}
insecure := new(urlpkg.URL)
*insecure = *url
insecure.Scheme = "http"
if insecure.User != nil && security != Insecure {
if cfg.BuildX {
fmt.Fprintf(os.Stderr, "# get %s: insecure credentials\n", Redacted(url))
}
return nil, fmt.Errorf("refusing to pass credentials to insecure URL: %s", Redacted(insecure))
}
fetched, res, err = fetch(insecure)
if err != nil {
if cfg.BuildX {
fmt.Fprintf(os.Stderr, "# get %s: %v\n", Redacted(url), err)
}
// HTTP failed, and we already tried HTTPS if applicable.
// Report the error from the HTTP attempt.
return nil, err
}
}
// Note: accepting a non-200 OK here, so people can serve a
// meta import in their http 404 page.
if cfg.BuildX {
fmt.Fprintf(os.Stderr, "# get %s: %v (%.3fs)\n", Redacted(url), res.Status, time.Since(start).Seconds())
}
r := &Response{
URL: Redacted(fetched),
Status: res.Status,
StatusCode: res.StatusCode,
Header: map[string][]string(res.Header),
Body: res.Body,
}
return r, nil
}
func getFile(u *urlpkg.URL) (*Response, error) {
path, err := urlToFilePath(u)
if err != nil {
return nil, err
}
f, err := os.Open(path)
if os.IsNotExist(err) {
return &Response{
URL: Redacted(u),
Status: http.StatusText(http.StatusNotFound),
StatusCode: http.StatusNotFound,
Body: http.NoBody,
}, nil
}
if os.IsPermission(err) {
return &Response{
URL: Redacted(u),
Status: http.StatusText(http.StatusForbidden),
StatusCode: http.StatusForbidden,
Body: http.NoBody,
}, nil
}
if err != nil {
return nil, err
}
return &Response{
URL: Redacted(u),
Status: http.StatusText(http.StatusOK),
StatusCode: http.StatusOK,
Body: f,
}, nil
}
func openBrowser(url string) bool { return browser.Open(url) }
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