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handler.go
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handler.go
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package main
import (
"bytes"
"errors"
"fmt"
"html/template"
"io"
"io/ioutil"
"log"
"net/http"
"regexp"
"strconv"
"strings"
)
var gogetTemplate = template.Must(template.New("").Parse(`
<html>
<head>
<meta charset="utf-8">
<meta name="go-import" content="{{.GopkgRoot}} git {{.GopkgScheme}}:https://{{.GopkgRoot}}">
{{$root := .VCSRoot}}{{$tree := .VCSTree}}
<meta name="go-source" content="{{.GopkgRoot}} _ {{$root}}/tree/{{$tree}}{/dir} {{$root}}/blob/{{$tree}}{/dir}/{file}#L{line}">
</head>
<body>
go get {{.GopkgPath}}
</body>
</html>
`))
var gopkgTemplate = template.Must(template.New("").Parse(`
<html>
<head>
<meta charset="utf-8">
{{$root := .VCSRoot}}
<meta name="go-import" content="{{.GopkgRoot}} git {{$root}}">
</head>
<body>
go get {{.GopkgPath}}
</body>
</html>
`))
//TODO 访问地址
// /group/project/sub
// /v/group/project.v2/sub
var patternVersion = regexp.MustCompile(`^/([-a-zA-Z0-9_]+)/([-a-zA-Z0-9_]+)\.(v0|v[1-9][0-9]*)((/[-.a-zA-Z0-9_]+)*)$`)
var patternPkg = regexp.MustCompile(`^/([-a-zA-Z0-9_]+)/([-a-zA-Z0-9_]+)((/[-.a-zA-Z0-9_]+)*)$`)
func handler(resp http.ResponseWriter, req *http.Request) {
urlPath := req.URL.Path
//b, _ := httputil.DumpRequest(req, false)
//fmt.Println(string(b))
if urlPath == "/health-check" {
resp.Write([]byte("ok"))
return
}
log.Printf("%s requested %s", req.Header.Get("X-Forwarded-For"), req.URL)
if urlPath == "/" {
resp.Header().Set("Location", config.VCSUrl)
resp.WriteHeader(http.StatusTemporaryRedirect)
return
}
log.Printf("req.URL.Path %s", urlPath)
var (
isGopkg = false
ok bool
m []string
)
//版本管理
if strings.HasPrefix(urlPath, "/v/") {
urlPath = urlPath[2:]
m = patternVersion.FindStringSubmatch(urlPath)
} else {
m = patternPkg.FindStringSubmatch(urlPath)
isGopkg = true
}
log.Println(m)
if m == nil {
sendErrMsg(resp, http.StatusNotFound, "Unsupported URL pattern; see the documentation at gopkg.in for details.\n")
return
}
repo := &Repo{
Group: m[1],
Name: m[2],
SubPath: m[3],
FullVersion: InvalidVersion,
}
//TODO gopkg
if isGopkg == true {
repo.Gopkg = true
resp.Header().Set("Content-Type", "text/html")
if req.FormValue("go-get") == "1" {
// execute simple template when this is a go-get request
err := gopkgTemplate.Execute(resp, repo)
if err != nil {
log.Printf("error executing go get template: %s\n", err)
}
}
return
}
//==========================以下为版本管理===============================
if strings.Contains(m[3], ".") {
sendErrMsg(resp, http.StatusOK, "Import paths take the major version only (.%s instead of .%s); see docs at gopkg.in for the reasoning.\n",
m[3][:strings.Index(m[3], ".")], m[3])
return
}
repo.SubPath = m[4]
repo.MajorVersion, ok = parseVersion(m[3])
if !ok {
sendErrMsg(resp, http.StatusNotFound, "Version %q improperly considered invalid; please warn the service maintainers.", m[3])
return
}
var changed []byte
var versions VersionList
original, err := fetchRefs(repo)
if err == nil {
changed, versions, err = changeRefs(original, repo.MajorVersion)
repo.SetVersions(versions)
}
switch err {
case nil:
// all ok
case ErrNoRepo:
sendErrMsg(resp, http.StatusNotFound, "GitHub repository not found at https://%s", repo.VCSRoot())
return
case ErrNoVersion:
major := repo.MajorVersion
suffix := ""
if major.Unstable {
major.Unstable = false
suffix = unstableSuffix
}
v := major.String()
sendErrMsg(resp, http.StatusNotFound, `GitHub repository at https://%s has no branch or tag "%s%s", "%s.N%s" or "%s.N.M%s"`,
repo.VCSRoot(), v, suffix, v, suffix, v, suffix)
return
default:
sendErrMsg(resp, http.StatusBadGateway, "Cannot obtain refs from GitHub: %v", err)
return
}
//程序中转远程仓库数据
if repo.SubPath == "/git-upload-pack" {
//请求远端gilab
url := fmt.Sprintf("%s.git%s", repo.VCSRoot(), "/git-upload-pack")
reqRemote, err := http.NewRequest("POST", url, req.Body)
if err != nil {
sendErrMsg(resp, http.StatusBadGateway, "GitLab get url is error: %v", err)
return
}
reqRemote.Header.Set("User-Agent", req.UserAgent())
reqRemote.Header.Set("Accept-Encoding", req.Header.Get("Accept-Encoding"))
reqRemote.Header.Set("Accept", req.Header.Get("Accept"))
reqRemote.Header.Set("Content-Type", req.Header.Get("Content-Type"))
if config.vcsNeedAuth {
reqRemote.SetBasicAuth(config.VCSAuthUser, config.VCSAuthPass)
}
respRemote, err := httpClient.Do(reqRemote)
if err != nil {
sendErrMsg(resp, http.StatusBadGateway, "GitLab get git-upload-pack error: %v", err)
return
}
defer respRemote.Body.Close()
if respRemote.StatusCode != http.StatusOK {
sendErrMsg(resp, http.StatusBadGateway, "GitLab get data error:http_code %d", respRemote.StatusCode)
return
}
//数据写给客户端
resp.Header().Set("Cache-Control", "no-cache")
resp.Header().Set("Content-Type", respRemote.Header.Get("Content-Type"))
resp.Header().Set("X-Accel-Buffering", respRemote.Header.Get("X-Accel-Buffering"))
_, err = io.Copy(resp, respRemote.Body)
if err != nil {
sendErrMsg(resp, http.StatusBadGateway, "GitLab write data error: %v", err)
return
}
return
}
if repo.SubPath == "/info/refs" {
resp.Header().Set("Content-Type", "application/x-git-upload-pack-advertisement")
resp.Write(changed)
return
}
resp.Header().Set("Content-Type", "text/html")
if req.FormValue("go-get") == "1" {
// execute simple template when this is a go-get request
err := gogetTemplate.Execute(resp, repo)
if err != nil {
log.Printf("error executing go get template: %s\n", err)
}
return
}
renderPackagePage(resp, req, repo)
}
// Repo represents a source code repository on GitHub.
type Repo struct {
Gopkg bool
Group string
Name string
SubPath string
MajorVersion Version
// FullVersion is the best version in AllVersions that matches MajorVersion.
// It defaults to InvalidVersion if there are no matches.
FullVersion Version
// AllVersions holds all versions currently available in the repository,
// either coming from branch names or from tag names. Version zero (v0)
// is only present in the list if it really exists in the repository.
AllVersions VersionList
}
// SetVersions records in the relevant fields the details about which
// package versions are available in the repository.
func (repo *Repo) SetVersions(all []Version) {
repo.AllVersions = all
for _, v := range repo.AllVersions {
if v.Major == repo.MajorVersion.Major && v.Unstable == repo.MajorVersion.Unstable && repo.FullVersion.Less(v) {
repo.FullVersion = v
}
}
}
// VCSRoot returns the repository root at VCS, with a schema.
func (repo *Repo) VCSRoot() string {
if repo.Gopkg {
//gitlab需要ssh协议
return "ssh:https://git@" + config.VCSHost + "/" + repo.Group + "/" + repo.Name + ".git"
}
return config.VCSUrl + "/" + repo.Group + "/" + repo.Name
}
// VCSTree returns the repository tree name at VCS for the selected version.
func (repo *Repo) VCSTree() string {
if repo.FullVersion == InvalidVersion {
return "master"
}
return repo.FullVersion.String()
}
func (repo *Repo) GopkgScheme() string {
return config.GopkgScheme
}
// GopkgRoot returns the package root at gopkg.in, without a schema.
func (repo *Repo) GopkgRoot() string {
return repo.GopkgVersionRoot(repo.MajorVersion)
}
// GopkgPath returns the package path at gopkg.in, without a schema.
func (repo *Repo) GopkgPath() string {
return repo.GopkgVersionRoot(repo.MajorVersion) + repo.SubPath
}
// GopkgVersionRoot returns the package root in gopkg.in for the
// provided version, without a schema.
func (repo *Repo) GopkgVersionRoot(version Version) string {
if repo.Gopkg {
return config.GopkgHost + "/" + repo.Group + "/" + repo.Name
}
version.Minor = -1
version.Patch = -1
v := version.String()
return config.GopkgHost + "/v/" + repo.Group + "/" + repo.Name + "." + v
}
func sendErrMsg(resp http.ResponseWriter, httpCode int, msg string, args ...interface{}) {
if len(args) > 0 {
msg = fmt.Sprintf(msg, args...)
}
resp.WriteHeader(httpCode)
resp.Write([]byte(msg))
}
const refsSuffix = ".git/info/refs?service=git-upload-pack"
var ErrNoRepo = errors.New("repository not found in GitHub")
var ErrNoVersion = errors.New("version reference not found in GitHub")
func fetchRefs(repo *Repo) (data []byte, err error) {
req, err := http.NewRequest("GET", repo.VCSRoot()+refsSuffix, nil)
if err != nil {
return
}
if config.vcsNeedAuth {
req.SetBasicAuth(config.VCSAuthUser, config.VCSAuthPass)
}
resp, err := httpClient.Do(req)
if err != nil {
return nil, fmt.Errorf("cannot talk to GitHub: %v", err)
}
defer resp.Body.Close()
switch resp.StatusCode {
case 200:
// ok
case 401, 404:
return nil, ErrNoRepo
default:
return nil, fmt.Errorf("error from GitHub: %v", resp.Status)
}
data, err = ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("error reading from GitHub: %v", err)
}
return data, err
}
func changeRefs(data []byte, major Version) (changed []byte, versions VersionList, err error) {
var hlinei, hlinej int // HEAD reference line start/end
var mlinei, mlinej int // master reference line start/end
var vrefhash string
var vrefname string
var vrefv = InvalidVersion
// Record all available versions, the locations of the master and HEAD lines,
// and details of the best reference satisfying the requested major version.
versions = make([]Version, 0)
sdata := string(data)
for i, j := 0, 0; i < len(data); i = j {
size, err := strconv.ParseInt(sdata[i:i+4], 16, 32)
if err != nil {
return nil, nil, fmt.Errorf("cannot parse refs line size: %s", string(data[i:i+4]))
}
if size == 0 {
size = 4
}
j = i + int(size)
if j > len(sdata) {
return nil, nil, fmt.Errorf("incomplete refs data received from GitHub")
}
if sdata[0] == '#' {
continue
}
hashi := i + 4
hashj := strings.IndexByte(sdata[hashi:j], ' ')
if hashj < 0 || hashj != 40 {
continue
}
hashj += hashi
namei := hashj + 1
namej := strings.IndexAny(sdata[namei:j], "\n\x00")
if namej < 0 {
namej = j
} else {
namej += namei
}
name := sdata[namei:namej]
if name == "HEAD" {
hlinei = i
hlinej = j
}
if name == "refs/heads/master" {
mlinei = i
mlinej = j
}
if strings.HasPrefix(name, "refs/heads/v") || strings.HasPrefix(name, "refs/tags/v") {
if strings.HasSuffix(name, "^{}") {
// Annotated tag is peeled off and overrides the same version just parsed.
name = name[:len(name)-3]
}
v, ok := parseVersion(name[strings.IndexByte(name, 'v'):])
if ok && major.Contains(v) && (v == vrefv || !vrefv.IsValid() || vrefv.Less(v)) {
vrefv = v
vrefhash = sdata[hashi:hashj]
vrefname = name
}
if ok {
versions = append(versions, v)
}
}
}
// If there were absolutely no versions, and v0 was requested, accept the master as-is.
if len(versions) == 0 && major == (Version{0, -1, -1, false}) {
return data, nil, nil
}
// If the file has no HEAD line or the version was not found, report as unavailable.
if hlinei == 0 || vrefhash == "" {
return nil, nil, ErrNoVersion
}
var buf bytes.Buffer
buf.Grow(len(data) + 256)
// Copy the header as-is.
buf.Write(data[:hlinei])
// Extract the original capabilities.
caps := ""
if i := strings.Index(sdata[hlinei:hlinej], "\x00"); i > 0 {
caps = strings.Replace(sdata[hlinei+i+1:hlinej-1], "symref=", "oldref=", -1)
}
// Insert the HEAD reference line with the right hash and a proper symref capability.
var line string
if strings.HasPrefix(vrefname, "refs/heads/") {
if caps == "" {
line = fmt.Sprintf("%s HEAD\x00symref=HEAD:%s\n", vrefhash, vrefname)
} else {
line = fmt.Sprintf("%s HEAD\x00symref=HEAD:%s %s\n", vrefhash, vrefname, caps)
}
} else {
if caps == "" {
line = fmt.Sprintf("%s HEAD\n", vrefhash)
} else {
line = fmt.Sprintf("%s HEAD\x00%s\n", vrefhash, caps)
}
}
fmt.Fprintf(&buf, "%04x%s", 4+len(line), line)
// Insert the master reference line.
line = fmt.Sprintf("%s refs/heads/master\n", vrefhash)
fmt.Fprintf(&buf, "%04x%s", 4+len(line), line)
// Append the rest, dropping the original master line if necessary.
if mlinei > 0 {
buf.Write(data[hlinej:mlinei])
buf.Write(data[mlinej:])
} else {
buf.Write(data[hlinej:])
}
return buf.Bytes(), versions, nil
}