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- package main
-
- import (
- "errors"
- "flag"
- "fmt"
- "io/ioutil"
- "log"
- "net/http"
- "os"
- "regexp"
- "strconv"
- "strings"
- "text/template"
- )
-
- var httpFlag = flag.String("http", ":8080", "Serve HTTP at given address")
- var httpsFlag = flag.String("https", "", "Serve HTTPS at given address")
- var certFlag = flag.String("cert", "", "Use the provided TLS certificate")
- var keyFlag = flag.String("key", "", "Use the provided TLS key")
-
- func main() {
- if err := run(); err != nil {
- fmt.Fprintf(os.Stderr, "error: %v\n", err)
- os.Exit(1)
- }
- }
-
- func run() error {
- flag.Parse()
- if len(flag.Args()) > 0 {
- return fmt.Errorf("too many arguments: %s", flag.Args()[0])
- }
-
- http.HandleFunc("/", handler)
-
- if *httpFlag == "" && *httpsFlag == "" {
- return fmt.Errorf("must provide -http and/or -https")
- }
- if (*httpsFlag != "" || *certFlag != "" || *keyFlag != "") && (*httpsFlag == "" || *certFlag == "" || *keyFlag == "") {
- return fmt.Errorf("-https -cert and -key must be used together")
- }
-
- ch := make(chan error, 2)
-
- if *httpFlag != "" {
- go func() {
- ch <- http.ListenAndServe(*httpFlag, nil)
- }()
- }
- if *httpsFlag != "" {
- go func() {
- ch <- http.ListenAndServeTLS(*httpsFlag, *certFlag, *keyFlag, nil)
- }()
- }
- return <-ch
- }
-
- var tmplProxy = template.Must(template.New("").Parse(`
- <html>
- <head>
- <meta name="go-import" content="{{.PkgRoot}} git {{.GitRoot}}">
- </head>
- <body>
- <script>
- window.location = "http://godoc.org/{{.PkgPath}}" + window.location.hash;
- </script>
- </body>
- </html>
- `))
-
- type Repo struct {
- User string // username or organization, includes forward slash
- Pkg string // repository name
- VersionStr string // version string ("v1")
- Path string // path inside repository
- Compat bool // when true, use old format
-
- Version Version // requested version (major only)
- Versions VersionList // available versions
- }
-
- func (repo *Repo) GitRoot() string {
- return "https://" + repo.PkgRoot()
- }
-
- func (repo *Repo) HubRoot() string {
- if len(repo.User) == 0 {
- return "https://github.com/go-" + repo.Pkg + "/" + repo.Pkg
- }
- return "https://github.com/" + repo.User + repo.Pkg
- }
-
- func (repo *Repo) PkgBase() string {
- return "gopkg.in/" + repo.User + repo.Pkg
- }
-
- func (repo *Repo) PkgRoot() string {
- if repo.Compat {
- return "gopkg.in/" + repo.User + repo.VersionStr + "/" + repo.Pkg
- }
- return repo.PkgBase() + "." + repo.VersionStr
- }
-
- func (repo *Repo) PkgPath() string {
- return repo.PkgRoot() + repo.Path
- }
-
- var patternOld = regexp.MustCompile(`^/([a-z0-9][-a-z0-9]+/)?((?:v0|v[1-9][0-9]*)(?:\.0|\.[1-9][0-9]*){0,2})/([a-zA-Z][-a-zA-Z0-9]*)(?:\.git)?((?:/[a-zA-Z][-a-zA-Z0-9]*)*)$`)
- var patternNew = regexp.MustCompile(`^/([a-z0-9][-a-z0-9]+/)?([a-zA-Z][-a-zA-Z0-9]*)\.((?:v0|v[1-9][0-9]*)(?:\.0|\.[1-9][0-9]*){0,2})(?:\.git)?((?:/[a-zA-Z][-a-zA-Z0-9]*)*)$`)
-
- func handler(resp http.ResponseWriter, req *http.Request) {
- if req.URL.Path == "/health-check" {
- resp.Write([]byte("ok"))
- return
- }
-
- log.Printf("%s requested %s", req.RemoteAddr, req.URL)
-
- if req.URL.Path == "/" {
- resp.Header().Set("Location", "http://labix.org/gopkg.in")
- resp.WriteHeader(http.StatusTemporaryRedirect)
- return
- }
-
- m := patternNew.FindStringSubmatch(req.URL.Path)
- compat := false
- if m == nil {
- m = patternOld.FindStringSubmatch(req.URL.Path)
- if m == nil {
- sendNotFound(resp, "Unsupported URL pattern; see the documentation at gopkg.in for details.")
- return
- }
- m[2], m[3] = m[3], m[2]
- compat = true
- }
-
- if strings.Contains(m[3], ".") {
- sendNotFound(resp, "Import paths take the major version only (.%s instead of .%s); see docs at gopkg.in for the reasoning.",
- m[3][:strings.Index(m[3], ".")], m[3])
- return
- }
-
- repo := &Repo{
- User: m[1],
- Pkg: m[2],
- VersionStr: m[3],
- Path: m[4],
- Compat: compat,
- }
-
- var ok bool
- repo.Version, ok = parseVersion(repo.VersionStr)
- if !ok {
- sendNotFound(resp, "Version %q improperly considered invalid; please warn the service maintainers.", m[3])
- return
- }
-
- var err error
- var refs []byte
- refs, repo.Versions, err = hackedRefs(repo)
- switch err {
- case nil:
- // all ok
- case ErrNoRepo:
- // if <-nameVersioned {
- // v := repo.Version.String()
- // repo.GitRoot += "-" + v
- // repo.HubRoot += "-" + v
- // break
- // }
- sendNotFound(resp, "GitHub repository not found at %s", repo.HubRoot())
- return
- case ErrNoVersion:
- v := repo.Version.String()
- if repo.Version.Minor == -1 {
- sendNotFound(resp, `GitHub repository at %s has no branch or tag "%s", "%s.N" or "%s.N.M"`, repo.HubRoot(), v, v, v)
- } else if repo.Version.Patch == -1 {
- sendNotFound(resp, `GitHub repository at %s has no branch or tag "%s" or "%s.N"`, repo.HubRoot(), v, v)
- } else {
- sendNotFound(resp, `GitHub repository at %s has no branch or tag "%s"`, repo.HubRoot(), v)
- }
- return
- default:
- resp.WriteHeader(http.StatusBadGateway)
- resp.Write([]byte(fmt.Sprintf("Cannot obtain refs from GitHub: %v", err)))
- return
- }
-
- if m[4] == "/git-upload-pack" {
- resp.Header().Set("Location", repo.HubRoot()+"/git-upload-pack")
- resp.WriteHeader(http.StatusMovedPermanently)
- return
- }
-
- if m[4] == "/info/refs" {
- resp.Header().Set("Content-Type", "application/x-git-upload-pack-advertisement")
- resp.Write(refs)
- 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 = tmplProxy.Execute(resp, repo)
- if err != nil {
- log.Printf("error executing tmplProxy: %s\n", err)
- }
- return
- }
-
- renderInterface(resp, req, repo)
- }
-
- func sendNotFound(resp http.ResponseWriter, msg string, args ...interface{}) {
- if len(args) > 0 {
- msg = fmt.Sprintf(msg, args...)
- }
- resp.WriteHeader(http.StatusNotFound)
- resp.Write([]byte(msg))
- }
-
- // TODO Timeouts for these http interactions. Use the new support coming in 1.3.
-
- 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 hackedRefs(repo *Repo) (data []byte, versions []Version, err error) {
- resp, err := http.Get(repo.HubRoot() + refsSuffix)
- if err != nil {
- return nil, nil, fmt.Errorf("cannot talk to GitHub: %v", err)
- }
- switch resp.StatusCode {
- case 200:
- defer resp.Body.Close()
- case 401, 404:
- return nil, nil, ErrNoRepo
- default:
- return nil, nil, fmt.Errorf("error from GitHub: %v", resp.Status)
- }
-
- data, err = ioutil.ReadAll(resp.Body)
- if err != nil {
- return nil, nil, fmt.Errorf("error reading from GitHub: %v", err)
- }
-
- var mrefi, mrefj int
- var vrefi, vrefj int
- var vrefv = InvalidVersion
- var unversioned = true
-
- 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 == "refs/heads/master" {
- mrefi = hashi
- mrefj = hashj
- }
-
- if strings.HasPrefix(name, "refs/heads/v") || strings.HasPrefix(name, "refs/tags/v") {
- v, ok := parseVersion(name[strings.IndexByte(name, 'v'):])
- if ok && repo.Version.Contains(v) && (!vrefv.IsValid() || vrefv.Less(v)) {
- vrefv = v
- vrefi = hashi
- vrefj = hashj
- }
- if ok {
- unversioned = false
- versions = append(versions, v)
- }
- }
- }
-
- // If there were absolutely no versions, and v0 was requested, accept the master as-is.
- if unversioned && repo.Version == (Version{0, -1, -1}) {
- return data, nil, nil
- }
-
- if mrefi == 0 || vrefi == 0 {
- return nil, nil, ErrNoVersion
- }
-
- copy(data[mrefi:mrefj], data[vrefi:vrefj])
- return data, versions, nil
- }
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