github.com/dannin/go@v0.0.0-20161031215817-d35dfd405eaa/src/cmd/go/http.go (about)

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build !cmd_go_bootstrap
     6  
     7  // This code is compiled into the real 'go' binary, but it is not
     8  // compiled into the binary that is built during all.bash, so as
     9  // to avoid needing to build net (and thus use cgo) during the
    10  // bootstrap process.
    11  
    12  package main
    13  
    14  import (
    15  	"cmd/internal/browser"
    16  	"crypto/tls"
    17  	"fmt"
    18  	"io"
    19  	"io/ioutil"
    20  	"log"
    21  	"net/http"
    22  	"net/url"
    23  	"time"
    24  )
    25  
    26  // httpClient is the default HTTP client, but a variable so it can be
    27  // changed by tests, without modifying http.DefaultClient.
    28  var httpClient = http.DefaultClient
    29  
    30  // impatientInsecureHTTPClient is used in -insecure mode,
    31  // when we're connecting to https servers that might not be there
    32  // or might be using self-signed certificates.
    33  var impatientInsecureHTTPClient = &http.Client{
    34  	Timeout: 5 * time.Second,
    35  	Transport: &http.Transport{
    36  		TLSClientConfig: &tls.Config{
    37  			InsecureSkipVerify: true,
    38  		},
    39  	},
    40  }
    41  
    42  type httpError struct {
    43  	status     string
    44  	statusCode int
    45  	url        string
    46  }
    47  
    48  func (e *httpError) Error() string {
    49  	return fmt.Sprintf("%s: %s", e.url, e.status)
    50  }
    51  
    52  // httpGET returns the data from an HTTP GET request for the given URL.
    53  func httpGET(url string) ([]byte, error) {
    54  	resp, err := httpClient.Get(url)
    55  	if err != nil {
    56  		return nil, err
    57  	}
    58  	defer resp.Body.Close()
    59  	if resp.StatusCode != 200 {
    60  		err := &httpError{status: resp.Status, statusCode: resp.StatusCode, url: url}
    61  
    62  		return nil, err
    63  	}
    64  	b, err := ioutil.ReadAll(resp.Body)
    65  	if err != nil {
    66  		return nil, fmt.Errorf("%s: %v", url, err)
    67  	}
    68  	return b, nil
    69  }
    70  
    71  // httpsOrHTTP returns the body of either the importPath's
    72  // https resource or, if unavailable, the http resource.
    73  func httpsOrHTTP(importPath string, security securityMode) (urlStr string, body io.ReadCloser, err error) {
    74  	fetch := func(scheme string) (urlStr string, res *http.Response, err error) {
    75  		u, err := url.Parse(scheme + "://" + importPath)
    76  		if err != nil {
    77  			return "", nil, err
    78  		}
    79  		u.RawQuery = "go-get=1"
    80  		urlStr = u.String()
    81  		if buildV {
    82  			log.Printf("Fetching %s", urlStr)
    83  		}
    84  		if security == insecure && scheme == "https" { // fail earlier
    85  			res, err = impatientInsecureHTTPClient.Get(urlStr)
    86  		} else {
    87  			res, err = httpClient.Get(urlStr)
    88  		}
    89  		return
    90  	}
    91  	closeBody := func(res *http.Response) {
    92  		if res != nil {
    93  			res.Body.Close()
    94  		}
    95  	}
    96  	urlStr, res, err := fetch("https")
    97  	if err != nil {
    98  		if buildV {
    99  			log.Printf("https fetch failed: %v", err)
   100  		}
   101  		if security == insecure {
   102  			closeBody(res)
   103  			urlStr, res, err = fetch("http")
   104  		}
   105  	}
   106  	if err != nil {
   107  		closeBody(res)
   108  		return "", nil, err
   109  	}
   110  	// Note: accepting a non-200 OK here, so people can serve a
   111  	// meta import in their http 404 page.
   112  	if buildV {
   113  		log.Printf("Parsing meta tags from %s (status code %d)", urlStr, res.StatusCode)
   114  	}
   115  	return urlStr, res.Body, nil
   116  }
   117  
   118  func queryEscape(s string) string { return url.QueryEscape(s) }
   119  func openBrowser(url string) bool { return browser.Open(url) }